Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

88 files changed, 19054 insertions, 0 deletions

diff --git a/services/arm_arch_svc/arm_arch_svc_setup.c b/services/arm_arch_svc/arm_arch_svc_setup.c
new file mode 100644
index 0000000..46ccd9e
--- /dev/null
+++ b/services/arm_arch_svc/arm_arch_svc_setup.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/cpus/errata_report.h>
+#include <lib/cpus/wa_cve_2017_5715.h>
+#include <lib/cpus/wa_cve_2018_3639.h>
+#include <lib/cpus/wa_cve_2022_23960.h>
+#include <lib/smccc.h>
+#include <services/arm_arch_svc.h>
+#include <smccc_helpers.h>
+#include <plat/common/platform.h>
+
+static int32_t smccc_version(void)
+{
+	return MAKE_SMCCC_VERSION(SMCCC_MAJOR_VERSION, SMCCC_MINOR_VERSION);
+}
+
+static int32_t smccc_arch_features(u_register_t arg1)
+{
+	switch (arg1) {
+	case SMCCC_VERSION:
+	case SMCCC_ARCH_FEATURES:
+		return SMC_ARCH_CALL_SUCCESS;
+	case SMCCC_ARCH_SOC_ID:
+		return plat_is_smccc_feature_available(arg1);
+#if WORKAROUND_CVE_2017_5715
+	case SMCCC_ARCH_WORKAROUND_1:
+		if (check_wa_cve_2017_5715() == ERRATA_NOT_APPLIES)
+			return 1;
+		return 0; /* ERRATA_APPLIES || ERRATA_MISSING */
+#endif
+
+#if WORKAROUND_CVE_2018_3639
+	case SMCCC_ARCH_WORKAROUND_2: {
+#if DYNAMIC_WORKAROUND_CVE_2018_3639
+		unsigned long long ssbs;
+
+		/*
+		 * Firmware doesn't have to carry out dynamic workaround if the
+		 * PE implements architectural Speculation Store Bypass Safe
+		 * (SSBS) feature.
+		 */
+		ssbs = (read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_SSBS_SHIFT) &
+			ID_AA64PFR1_EL1_SSBS_MASK;
+
+		/*
+		 * If architectural SSBS is available on this PE, no firmware
+		 * mitigation via SMCCC_ARCH_WORKAROUND_2 is required.
+		 */
+		if (ssbs != SSBS_UNAVAILABLE)
+			return 1;
+
+		/*
+		 * On a platform where at least one CPU requires
+		 * dynamic mitigation but others are either unaffected
+		 * or permanently mitigated, report the latter as not
+		 * needing dynamic mitigation.
+		 */
+		if (wa_cve_2018_3639_get_disable_ptr() == NULL)
+			return 1;
+		/*
+		 * If we get here, this CPU requires dynamic mitigation
+		 * so report it as such.
+		 */
+		return 0;
+#else
+		/* Either the CPUs are unaffected or permanently mitigated */
+		return SMC_ARCH_CALL_NOT_REQUIRED;
+#endif
+	}
+#endif
+
+#if (WORKAROUND_CVE_2022_23960 || WORKAROUND_CVE_2017_5715)
+	case SMCCC_ARCH_WORKAROUND_3:
+		/*
+		 * SMCCC_ARCH_WORKAROUND_3 should also take into account
+		 * CVE-2017-5715 since this SMC can be used instead of
+		 * SMCCC_ARCH_WORKAROUND_1.
+		 */
+		if ((check_smccc_arch_wa3_applies() == ERRATA_NOT_APPLIES) &&
+		    (check_wa_cve_2017_5715() == ERRATA_NOT_APPLIES)) {
+			return 1;
+		}
+		return 0; /* ERRATA_APPLIES || ERRATA_MISSING */
+#endif
+
+	/* Fallthrough */
+
+	default:
+		return SMC_UNK;
+	}
+}
+
+/* return soc revision or soc version on success otherwise
+ * return invalid parameter */
+static int32_t smccc_arch_id(u_register_t arg1)
+{
+	if (arg1 == SMCCC_GET_SOC_REVISION) {
+		return plat_get_soc_revision();
+	}
+	if (arg1 == SMCCC_GET_SOC_VERSION) {
+		return plat_get_soc_version();
+	}
+	return SMC_ARCH_CALL_INVAL_PARAM;
+}
+
+/*
+ * Top-level Arm Architectural Service SMC handler.
+ */
+static uintptr_t arm_arch_svc_smc_handler(uint32_t smc_fid,
+	u_register_t x1,
+	u_register_t x2,
+	u_register_t x3,
+	u_register_t x4,
+	void *cookie,
+	void *handle,
+	u_register_t flags)
+{
+	switch (smc_fid) {
+	case SMCCC_VERSION:
+		SMC_RET1(handle, smccc_version());
+	case SMCCC_ARCH_FEATURES:
+		SMC_RET1(handle, smccc_arch_features(x1));
+	case SMCCC_ARCH_SOC_ID:
+		SMC_RET1(handle, smccc_arch_id(x1));
+#if WORKAROUND_CVE_2017_5715
+	case SMCCC_ARCH_WORKAROUND_1:
+		/*
+		 * The workaround has already been applied on affected PEs
+		 * during entry to EL3. On unaffected PEs, this function
+		 * has no effect.
+		 */
+		SMC_RET0(handle);
+#endif
+#if WORKAROUND_CVE_2018_3639
+	case SMCCC_ARCH_WORKAROUND_2:
+		/*
+		 * The workaround has already been applied on affected PEs
+		 * requiring dynamic mitigation during entry to EL3.
+		 * On unaffected or statically mitigated PEs, this function
+		 * has no effect.
+		 */
+		SMC_RET0(handle);
+#endif
+#if (WORKAROUND_CVE_2022_23960 || WORKAROUND_CVE_2017_5715)
+	case SMCCC_ARCH_WORKAROUND_3:
+		/*
+		 * The workaround has already been applied on affected PEs
+		 * during entry to EL3. On unaffected PEs, this function
+		 * has no effect.
+		 */
+		SMC_RET0(handle);
+#endif
+	default:
+		WARN("Unimplemented Arm Architecture Service Call: 0x%x \n",
+			smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/* Register Standard Service Calls as runtime service */
+DECLARE_RT_SVC(
+		arm_arch_svc,
+		OEN_ARM_START,
+		OEN_ARM_END,
+		SMC_TYPE_FAST,
+		NULL,
+		arm_arch_svc_smc_handler
+);
diff --git a/services/spd/opteed/opteed.mk b/services/spd/opteed/opteed.mk
new file mode 100644
index 0000000..643b054
--- /dev/null
+++ b/services/spd/opteed/opteed.mk
@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+OPTEED_DIR		:=	services/spd/opteed
+SPD_INCLUDES		:=
+
+SPD_SOURCES		:=	services/spd/opteed/opteed_common.c	\
+				services/spd/opteed/opteed_helpers.S	\
+				services/spd/opteed/opteed_main.c	\
+				services/spd/opteed/opteed_pm.c
+
+NEED_BL32		:=	yes
+
+# required so that optee code can control access to the timer registers
+NS_TIMER_SWITCH		:=	1
diff --git a/services/spd/opteed/opteed_common.c b/services/spd/opteed/opteed_common.c
new file mode 100644
index 0000000..9aa19c5
--- /dev/null
+++ b/services/spd/opteed/opteed_common.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/utils.h>
+
+#include "opteed_private.h"
+
+/*******************************************************************************
+ * Given a OPTEE entrypoint info pointer, entry point PC, register width,
+ * cpu id & pointer to a context data structure, this function will
+ * initialize OPTEE context and entry point info for OPTEE.
+ ******************************************************************************/
+void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point,
+				uint32_t rw, uint64_t pc,
+				uint64_t pageable_part, uint64_t mem_limit,
+				uint64_t dt_addr, optee_context_t *optee_ctx)
+{
+	uint32_t ep_attr;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(optee_ctx);
+	assert(optee_entry_point);
+	assert(pc);
+
+	/* Associate this context with the cpu specified */
+	optee_ctx->mpidr = read_mpidr_el1();
+	optee_ctx->state = 0;
+	set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF);
+
+	cm_set_context(&optee_ctx->cpu_ctx, SECURE);
+
+	/* initialise an entrypoint to set up the CPU context */
+	ep_attr = SECURE | EP_ST_ENABLE;
+	if (read_sctlr_el3() & SCTLR_EE_BIT)
+		ep_attr |= EP_EE_BIG;
+	SET_PARAM_HEAD(optee_entry_point, PARAM_EP, VERSION_1, ep_attr);
+	optee_entry_point->pc = pc;
+	if (rw == OPTEE_AARCH64)
+		optee_entry_point->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
+						  DISABLE_ALL_EXCEPTIONS);
+	else
+		optee_entry_point->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM,
+						      SPSR_E_LITTLE,
+						      DAIF_FIQ_BIT |
+							DAIF_IRQ_BIT |
+							DAIF_ABT_BIT);
+	zeromem(&optee_entry_point->args, sizeof(optee_entry_point->args));
+	optee_entry_point->args.arg0 = pageable_part;
+	optee_entry_point->args.arg1 = mem_limit;
+	optee_entry_point->args.arg2 = dt_addr;
+}
+
+/*******************************************************************************
+ * This function takes an OPTEE context pointer and:
+ * 1. Applies the S-EL1 system register context from optee_ctx->cpu_ctx.
+ * 2. Saves the current C runtime state (callee saved registers) on the stack
+ *    frame and saves a reference to this state.
+ * 3. Calls el3_exit() so that the EL3 system and general purpose registers
+ *    from the optee_ctx->cpu_ctx are used to enter the OPTEE image.
+ ******************************************************************************/
+uint64_t opteed_synchronous_sp_entry(optee_context_t *optee_ctx)
+{
+	uint64_t rc;
+
+	assert(optee_ctx != NULL);
+	assert(optee_ctx->c_rt_ctx == 0);
+
+	/* Apply the Secure EL1 system register context and switch to it */
+	assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx);
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	rc = opteed_enter_sp(&optee_ctx->c_rt_ctx);
+#if ENABLE_ASSERTIONS
+	optee_ctx->c_rt_ctx = 0;
+#endif
+
+	return rc;
+}
+
+
+/*******************************************************************************
+ * This function takes an OPTEE context pointer and:
+ * 1. Saves the S-EL1 system register context tp optee_ctx->cpu_ctx.
+ * 2. Restores the current C runtime state (callee saved registers) from the
+ *    stack frame using the reference to this state saved in opteed_enter_sp().
+ * 3. It does not need to save any general purpose or EL3 system register state
+ *    as the generic smc entry routine should have saved those.
+ ******************************************************************************/
+void opteed_synchronous_sp_exit(optee_context_t *optee_ctx, uint64_t ret)
+{
+	assert(optee_ctx != NULL);
+	/* Save the Secure EL1 system register context */
+	assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx);
+	cm_el1_sysregs_context_save(SECURE);
+
+	assert(optee_ctx->c_rt_ctx != 0);
+	opteed_exit_sp(optee_ctx->c_rt_ctx, ret);
+
+	/* Should never reach here */
+	assert(0);
+}
diff --git a/services/spd/opteed/opteed_helpers.S b/services/spd/opteed/opteed_helpers.S
new file mode 100644
index 0000000..075a71b
--- /dev/null
+++ b/services/spd/opteed/opteed_helpers.S
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "opteed_private.h"
+
+	.global	opteed_enter_sp
+	/* ---------------------------------------------
+	 * This function is called with SP_EL0 as stack.
+	 * Here we stash our EL3 callee-saved registers
+	 * on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where
+	 * the address of the C runtime context is to be
+	 * saved.
+	 * ---------------------------------------------
+	 */
+func opteed_enter_sp
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #OPTEED_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #OPTEED_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #OPTEED_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #OPTEED_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #OPTEED_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #OPTEED_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #OPTEED_C_RT_CTX_X29]
+
+	/* ---------------------------------------------
+	 * Everything is setup now. el3_exit() will
+	 * use the secure context to restore to the
+	 * general purpose and EL3 system registers to
+	 * ERET into OPTEE.
+	 * ---------------------------------------------
+	 */
+	b	el3_exit
+endfunc opteed_enter_sp
+
+	/* ---------------------------------------------
+	 * This function is called 'x0' pointing to a C
+	 * runtime context saved in opteed_enter_sp().  It
+	 * restores the saved registers and jumps to
+	 * that runtime with 'x0' as the new sp. This
+	 * destroys the C runtime context that had been
+	 * built on the stack below the saved context by
+	 * the caller. Later the second parameter 'x1'
+	 * is passed as return value to the caller
+	 * ---------------------------------------------
+	 */
+	.global opteed_exit_sp
+func opteed_exit_sp
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(OPTEED_C_RT_CTX_X19 - OPTEED_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(OPTEED_C_RT_CTX_X21 - OPTEED_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(OPTEED_C_RT_CTX_X23 - OPTEED_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(OPTEED_C_RT_CTX_X25 - OPTEED_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(OPTEED_C_RT_CTX_X27 - OPTEED_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(OPTEED_C_RT_CTX_X29 - OPTEED_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------
+	 * This should take us back to the instruction
+	 * after the call to the last opteed_enter_sp().
+	 * Place the second parameter to x0 so that the
+	 * caller will see it as a return value from the
+	 * original entry call
+	 * ---------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc opteed_exit_sp
diff --git a/services/spd/opteed/opteed_main.c b/services/spd/opteed/opteed_main.c
new file mode 100644
index 0000000..160a693
--- /dev/null
+++ b/services/spd/opteed/opteed_main.c
@@ -0,0 +1,420 @@
+/*
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+/*******************************************************************************
+ * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a
+ * plug-in component to the Secure Monitor, registered as a runtime service. The
+ * SPD is expected to be a functional extension of the Secure Payload (SP) that
+ * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting
+ * the Trusted OS/Applications range to the dispatcher. The SPD will either
+ * handle the request locally or delegate it to the Secure Payload. It is also
+ * responsible for initialising and maintaining communication with the SP.
+ ******************************************************************************/
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+#include <tools_share/uuid.h>
+
+#include "opteed_private.h"
+#include "teesmc_opteed.h"
+#include "teesmc_opteed_macros.h"
+
+/*******************************************************************************
+ * Address of the entrypoint vector table in OPTEE. It is
+ * initialised once on the primary core after a cold boot.
+ ******************************************************************************/
+struct optee_vectors *optee_vector_table;
+
+/*******************************************************************************
+ * Array to keep track of per-cpu OPTEE state
+ ******************************************************************************/
+optee_context_t opteed_sp_context[OPTEED_CORE_COUNT];
+uint32_t opteed_rw;
+
+static int32_t opteed_init(void);
+
+/*******************************************************************************
+ * This function is the handler registered for S-EL1 interrupts by the
+ * OPTEED. It validates the interrupt and upon success arranges entry into
+ * the OPTEE at 'optee_fiq_entry()' for handling the interrupt.
+ ******************************************************************************/
+static uint64_t opteed_sel1_interrupt_handler(uint32_t id,
+					    uint32_t flags,
+					    void *handle,
+					    void *cookie)
+{
+	uint32_t linear_id;
+	optee_context_t *optee_ctx;
+
+	/* Check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+
+	/* Sanity check the pointer to this cpu's context */
+	assert(handle == cm_get_context(NON_SECURE));
+
+	/* Save the non-secure context before entering the OPTEE */
+	cm_el1_sysregs_context_save(NON_SECURE);
+
+	/* Get a reference to this cpu's OPTEE context */
+	linear_id = plat_my_core_pos();
+	optee_ctx = &opteed_sp_context[linear_id];
+	assert(&optee_ctx->cpu_ctx == cm_get_context(SECURE));
+
+	cm_set_elr_el3(SECURE, (uint64_t)&optee_vector_table->fiq_entry);
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	/*
+	 * Tell the OPTEE that it has to handle an FIQ (synchronously).
+	 * Also the instruction in normal world where the interrupt was
+	 * generated is passed for debugging purposes. It is safe to
+	 * retrieve this address from ELR_EL3 as the secure context will
+	 * not take effect until el3_exit().
+	 */
+	SMC_RET1(&optee_ctx->cpu_ctx, read_elr_el3());
+}
+
+/*******************************************************************************
+ * OPTEE Dispatcher setup. The OPTEED finds out the OPTEE entrypoint and type
+ * (aarch32/aarch64) if not already known and initialises the context for entry
+ * into OPTEE for its initialization.
+ ******************************************************************************/
+static int32_t opteed_setup(void)
+{
+	entry_point_info_t *optee_ep_info;
+	uint32_t linear_id;
+	uint64_t opteed_pageable_part;
+	uint64_t opteed_mem_limit;
+	uint64_t dt_addr;
+
+	linear_id = plat_my_core_pos();
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.  TODO: Add support to
+	 * conditionally include the SPD service
+	 */
+	optee_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (!optee_ep_info) {
+		WARN("No OPTEE provided by BL2 boot loader, Booting device"
+			" without OPTEE initialization. SMC`s destined for OPTEE"
+			" will return SMC_UNK\n");
+		return 1;
+	}
+
+	/*
+	 * If there's no valid entry point for SP, we return a non-zero value
+	 * signalling failure initializing the service. We bail out without
+	 * registering any handlers
+	 */
+	if (!optee_ep_info->pc)
+		return 1;
+
+	opteed_rw = optee_ep_info->args.arg0;
+	opteed_pageable_part = optee_ep_info->args.arg1;
+	opteed_mem_limit = optee_ep_info->args.arg2;
+	dt_addr = optee_ep_info->args.arg3;
+
+	opteed_init_optee_ep_state(optee_ep_info,
+				opteed_rw,
+				optee_ep_info->pc,
+				opteed_pageable_part,
+				opteed_mem_limit,
+				dt_addr,
+				&opteed_sp_context[linear_id]);
+
+	/*
+	 * All OPTEED initialization done. Now register our init function with
+	 * BL31 for deferred invocation
+	 */
+	bl31_register_bl32_init(&opteed_init);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function passes control to the OPTEE image (BL32) for the first time
+ * on the primary cpu after a cold boot. It assumes that a valid secure
+ * context has already been created by opteed_setup() which can be directly
+ * used.  It also assumes that a valid non-secure context has been
+ * initialised by PSCI so it does not need to save and restore any
+ * non-secure state. This function performs a synchronous entry into
+ * OPTEE. OPTEE passes control back to this routine through a SMC.
+ ******************************************************************************/
+static int32_t opteed_init(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+	entry_point_info_t *optee_entry_point;
+	uint64_t rc;
+
+	/*
+	 * Get information about the OPTEE (BL32) image. Its
+	 * absence is a critical failure.
+	 */
+	optee_entry_point = bl31_plat_get_next_image_ep_info(SECURE);
+	assert(optee_entry_point);
+
+	cm_init_my_context(optee_entry_point);
+
+	/*
+	 * Arrange for an entry into OPTEE. It will be returned via
+	 * OPTEE_ENTRY_DONE case
+	 */
+	rc = opteed_synchronous_sp_entry(optee_ctx);
+	assert(rc != 0);
+
+	return rc;
+}
+
+
+/*******************************************************************************
+ * This function is responsible for handling all SMCs in the Trusted OS/App
+ * range from the non-secure state as defined in the SMC Calling Convention
+ * Document. It is also responsible for communicating with the Secure
+ * payload to delegate work and return results back to the non-secure
+ * state. Lastly it will also return any information that OPTEE needs to do
+ * the work assigned to it.
+ ******************************************************************************/
+static uintptr_t opteed_smc_handler(uint32_t smc_fid,
+			 u_register_t x1,
+			 u_register_t x2,
+			 u_register_t x3,
+			 u_register_t x4,
+			 void *cookie,
+			 void *handle,
+			 u_register_t flags)
+{
+	cpu_context_t *ns_cpu_context;
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+	uint64_t rc;
+
+	/*
+	 * Determine which security state this SMC originated from
+	 */
+
+	if (is_caller_non_secure(flags)) {
+		/*
+		 * This is a fresh request from the non-secure client.
+		 * The parameters are in x1 and x2. Figure out which
+		 * registers need to be preserved, save the non-secure
+		 * state and send the request to the secure payload.
+		 */
+		assert(handle == cm_get_context(NON_SECURE));
+
+		cm_el1_sysregs_context_save(NON_SECURE);
+
+		/*
+		 * We are done stashing the non-secure context. Ask the
+		 * OPTEE to do the work now.
+		 */
+
+		/*
+		 * Verify if there is a valid context to use, copy the
+		 * operation type and parameters to the secure context
+		 * and jump to the fast smc entry point in the secure
+		 * payload. Entry into S-EL1 will take place upon exit
+		 * from this function.
+		 */
+		assert(&optee_ctx->cpu_ctx == cm_get_context(SECURE));
+
+		/* Set appropriate entry for SMC.
+		 * We expect OPTEE to manage the PSTATE.I and PSTATE.F
+		 * flags as appropriate.
+		 */
+		if (GET_SMC_TYPE(smc_fid) == SMC_TYPE_FAST) {
+			cm_set_elr_el3(SECURE, (uint64_t)
+					&optee_vector_table->fast_smc_entry);
+		} else {
+			cm_set_elr_el3(SECURE, (uint64_t)
+					&optee_vector_table->yield_smc_entry);
+		}
+
+		cm_el1_sysregs_context_restore(SECURE);
+		cm_set_next_eret_context(SECURE);
+
+		write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
+			      CTX_GPREG_X4,
+			      read_ctx_reg(get_gpregs_ctx(handle),
+					   CTX_GPREG_X4));
+		write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
+			      CTX_GPREG_X5,
+			      read_ctx_reg(get_gpregs_ctx(handle),
+					   CTX_GPREG_X5));
+		write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
+			      CTX_GPREG_X6,
+			      read_ctx_reg(get_gpregs_ctx(handle),
+					   CTX_GPREG_X6));
+		/* Propagate hypervisor client ID */
+		write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
+			      CTX_GPREG_X7,
+			      read_ctx_reg(get_gpregs_ctx(handle),
+					   CTX_GPREG_X7));
+
+		SMC_RET4(&optee_ctx->cpu_ctx, smc_fid, x1, x2, x3);
+	}
+
+	/*
+	 * Returning from OPTEE
+	 */
+
+	switch (smc_fid) {
+	/*
+	 * OPTEE has finished initialising itself after a cold boot
+	 */
+	case TEESMC_OPTEED_RETURN_ENTRY_DONE:
+		/*
+		 * Stash the OPTEE entry points information. This is done
+		 * only once on the primary cpu
+		 */
+		assert(optee_vector_table == NULL);
+		optee_vector_table = (optee_vectors_t *) x1;
+
+		if (optee_vector_table) {
+			set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
+
+			/*
+			 * OPTEE has been successfully initialized.
+			 * Register power management hooks with PSCI
+			 */
+			psci_register_spd_pm_hook(&opteed_pm);
+
+			/*
+			 * Register an interrupt handler for S-EL1 interrupts
+			 * when generated during code executing in the
+			 * non-secure state.
+			 */
+			flags = 0;
+			set_interrupt_rm_flag(flags, NON_SECURE);
+			rc = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+						opteed_sel1_interrupt_handler,
+						flags);
+			if (rc)
+				panic();
+		}
+
+		/*
+		 * OPTEE reports completion. The OPTEED must have initiated
+		 * the original request through a synchronous entry into
+		 * OPTEE. Jump back to the original C runtime context.
+		 */
+		opteed_synchronous_sp_exit(optee_ctx, x1);
+		break;
+
+
+	/*
+	 * These function IDs is used only by OP-TEE to indicate it has
+	 * finished:
+	 * 1. turning itself on in response to an earlier psci
+	 *    cpu_on request
+	 * 2. resuming itself after an earlier psci cpu_suspend
+	 *    request.
+	 */
+	case TEESMC_OPTEED_RETURN_ON_DONE:
+	case TEESMC_OPTEED_RETURN_RESUME_DONE:
+
+
+	/*
+	 * These function IDs is used only by the SP to indicate it has
+	 * finished:
+	 * 1. suspending itself after an earlier psci cpu_suspend
+	 *    request.
+	 * 2. turning itself off in response to an earlier psci
+	 *    cpu_off request.
+	 */
+	case TEESMC_OPTEED_RETURN_OFF_DONE:
+	case TEESMC_OPTEED_RETURN_SUSPEND_DONE:
+	case TEESMC_OPTEED_RETURN_SYSTEM_OFF_DONE:
+	case TEESMC_OPTEED_RETURN_SYSTEM_RESET_DONE:
+
+		/*
+		 * OPTEE reports completion. The OPTEED must have initiated the
+		 * original request through a synchronous entry into OPTEE.
+		 * Jump back to the original C runtime context, and pass x1 as
+		 * return value to the caller
+		 */
+		opteed_synchronous_sp_exit(optee_ctx, x1);
+		break;
+
+	/*
+	 * OPTEE is returning from a call or being preempted from a call, in
+	 * either case execution should resume in the normal world.
+	 */
+	case TEESMC_OPTEED_RETURN_CALL_DONE:
+		/*
+		 * This is the result from the secure client of an
+		 * earlier request. The results are in x0-x3. Copy it
+		 * into the non-secure context, save the secure state
+		 * and return to the non-secure state.
+		 */
+		assert(handle == cm_get_context(SECURE));
+		cm_el1_sysregs_context_save(SECURE);
+
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/* Restore non-secure state */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+
+		SMC_RET4(ns_cpu_context, x1, x2, x3, x4);
+
+	/*
+	 * OPTEE has finished handling a S-EL1 FIQ interrupt. Execution
+	 * should resume in the normal world.
+	 */
+	case TEESMC_OPTEED_RETURN_FIQ_DONE:
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/*
+		 * Restore non-secure state. There is no need to save the
+		 * secure system register context since OPTEE was supposed
+		 * to preserve it during S-EL1 interrupt handling.
+		 */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+
+		SMC_RET0((uint64_t) ns_cpu_context);
+
+	default:
+		panic();
+	}
+}
+
+/* Define an OPTEED runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	opteed_fast,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_FAST,
+	opteed_setup,
+	opteed_smc_handler
+);
+
+/* Define an OPTEED runtime service descriptor for yielding SMC calls */
+DECLARE_RT_SVC(
+	opteed_std,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_YIELD,
+	NULL,
+	opteed_smc_handler
+);
diff --git a/services/spd/opteed/opteed_pm.c b/services/spd/opteed/opteed_pm.c
new file mode 100644
index 0000000..719eeb7
--- /dev/null
+++ b/services/spd/opteed/opteed_pm.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+
+#include "opteed_private.h"
+
+/*******************************************************************************
+ * The target cpu is being turned on. Allow the OPTEED/OPTEE to perform any
+ * actions needed. Nothing at the moment.
+ ******************************************************************************/
+static void opteed_cpu_on_handler(u_register_t target_cpu)
+{
+}
+
+/*******************************************************************************
+ * This cpu is being turned off. Allow the OPTEED/OPTEE to perform any actions
+ * needed
+ ******************************************************************************/
+static int32_t opteed_cpu_off_handler(u_register_t unused)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
+
+	/* Program the entry point and enter OPTEE */
+	cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_off_entry);
+	rc = opteed_synchronous_sp_entry(optee_ctx);
+
+	/*
+	 * Read the response from OPTEE. A non-zero return means that
+	 * something went wrong while communicating with OPTEE.
+	 */
+	if (rc != 0)
+		panic();
+
+	/*
+	 * Reset OPTEE's context for a fresh start when this cpu is turned on
+	 * subsequently.
+	 */
+	set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF);
+
+	 return 0;
+}
+
+/*******************************************************************************
+ * This cpu is being suspended. S-EL1 state must have been saved in the
+ * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
+ ******************************************************************************/
+static void opteed_cpu_suspend_handler(u_register_t max_off_pwrlvl)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
+
+	write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx), CTX_GPREG_X0,
+		      max_off_pwrlvl);
+
+	/* Program the entry point and enter OPTEE */
+	cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_suspend_entry);
+	rc = opteed_synchronous_sp_entry(optee_ctx);
+
+	/*
+	 * Read the response from OPTEE. A non-zero return means that
+	 * something went wrong while communicating with OPTEE.
+	 */
+	if (rc != 0)
+		panic();
+
+	/* Update its context to reflect the state OPTEE is in */
+	set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_SUSPEND);
+}
+
+/*******************************************************************************
+ * This cpu has been turned on. Enter OPTEE to initialise S-EL1 and other bits
+ * before passing control back to the Secure Monitor. Entry in S-El1 is done
+ * after initialising minimal architectural state that guarantees safe
+ * execution.
+ ******************************************************************************/
+static void opteed_cpu_on_finish_handler(u_register_t unused)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+	entry_point_info_t optee_on_entrypoint;
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_OFF);
+
+	opteed_init_optee_ep_state(&optee_on_entrypoint, opteed_rw,
+				(uint64_t)&optee_vector_table->cpu_on_entry,
+				0, 0, 0, optee_ctx);
+
+	/* Initialise this cpu's secure context */
+	cm_init_my_context(&optee_on_entrypoint);
+
+	/* Enter OPTEE */
+	rc = opteed_synchronous_sp_entry(optee_ctx);
+
+	/*
+	 * Read the response from OPTEE. A non-zero return means that
+	 * something went wrong while communicating with OPTEE.
+	 */
+	if (rc != 0)
+		panic();
+
+	/* Update its context to reflect the state OPTEE is in */
+	set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
+}
+
+/*******************************************************************************
+ * This cpu has resumed from suspend. The OPTEED saved the OPTEE context when it
+ * completed the preceding suspend call. Use that context to program an entry
+ * into OPTEE to allow it to do any remaining book keeping
+ ******************************************************************************/
+static void opteed_cpu_suspend_finish_handler(u_register_t max_off_pwrlvl)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_SUSPEND);
+
+	/* Program the entry point, max_off_pwrlvl and enter the SP */
+	write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
+		      CTX_GPREG_X0,
+		      max_off_pwrlvl);
+	cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_resume_entry);
+	rc = opteed_synchronous_sp_entry(optee_ctx);
+
+	/*
+	 * Read the response from OPTEE. A non-zero return means that
+	 * something went wrong while communicating with OPTEE.
+	 */
+	if (rc != 0)
+		panic();
+
+	/* Update its context to reflect the state OPTEE is in */
+	set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
+}
+
+/*******************************************************************************
+ * Return the type of OPTEE the OPTEED is dealing with. Report the current
+ * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
+ ******************************************************************************/
+static int32_t opteed_cpu_migrate_info(u_register_t *resident_cpu)
+{
+	return OPTEE_MIGRATE_INFO;
+}
+
+/*******************************************************************************
+ * System is about to be switched off. Allow the OPTEED/OPTEE to perform
+ * any actions needed.
+ ******************************************************************************/
+static void opteed_system_off(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_off_entry);
+
+	/* Enter OPTEE. We do not care about the return value because we
+	 * must continue the shutdown anyway */
+	opteed_synchronous_sp_entry(optee_ctx);
+}
+
+/*******************************************************************************
+ * System is about to be reset. Allow the OPTEED/OPTEE to perform
+ * any actions needed.
+ ******************************************************************************/
+static void opteed_system_reset(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
+
+	assert(optee_vector_table);
+	assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_reset_entry);
+
+	/* Enter OPTEE. We do not care about the return value because we
+	 * must continue the reset anyway */
+	opteed_synchronous_sp_entry(optee_ctx);
+}
+
+
+/*******************************************************************************
+ * Structure populated by the OPTEE Dispatcher to be given a chance to
+ * perform any OPTEE bookkeeping before PSCI executes a power mgmt.
+ * operation.
+ ******************************************************************************/
+const spd_pm_ops_t opteed_pm = {
+	.svc_on = opteed_cpu_on_handler,
+	.svc_off = opteed_cpu_off_handler,
+	.svc_suspend = opteed_cpu_suspend_handler,
+	.svc_on_finish = opteed_cpu_on_finish_handler,
+	.svc_suspend_finish = opteed_cpu_suspend_finish_handler,
+	.svc_migrate = NULL,
+	.svc_migrate_info = opteed_cpu_migrate_info,
+	.svc_system_off = opteed_system_off,
+	.svc_system_reset = opteed_system_reset,
+};
diff --git a/services/spd/opteed/opteed_private.h b/services/spd/opteed/opteed_private.h
new file mode 100644
index 0000000..242154f
--- /dev/null
+++ b/services/spd/opteed/opteed_private.h
@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef OPTEED_PRIVATE_H
+#define OPTEED_PRIVATE_H
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <bl31/interrupt_mgmt.h>
+#include <context.h>
+#include <lib/psci/psci.h>
+
+/*******************************************************************************
+ * OPTEE PM state information e.g. OPTEE is suspended, uninitialised etc
+ * and macros to access the state information in the per-cpu 'state' flags
+ ******************************************************************************/
+#define OPTEE_PSTATE_OFF		0
+#define OPTEE_PSTATE_ON			1
+#define OPTEE_PSTATE_SUSPEND		2
+#define OPTEE_PSTATE_SHIFT		0
+#define OPTEE_PSTATE_MASK		0x3
+#define get_optee_pstate(state)	((state >> OPTEE_PSTATE_SHIFT) & \
+				 OPTEE_PSTATE_MASK)
+#define clr_optee_pstate(state)	(state &= ~(OPTEE_PSTATE_MASK \
+					    << OPTEE_PSTATE_SHIFT))
+#define set_optee_pstate(st, pst) do {					       \
+					clr_optee_pstate(st);		       \
+					st |= (pst & OPTEE_PSTATE_MASK) <<     \
+						OPTEE_PSTATE_SHIFT;	       \
+				} while (0)
+
+
+/*******************************************************************************
+ * OPTEE execution state information i.e. aarch32 or aarch64
+ ******************************************************************************/
+#define OPTEE_AARCH32		MODE_RW_32
+#define OPTEE_AARCH64		MODE_RW_64
+
+/*******************************************************************************
+ * The OPTEED should know the type of OPTEE
+ ******************************************************************************/
+#define OPTEE_TYPE_UP		PSCI_TOS_NOT_UP_MIG_CAP
+#define OPTEE_TYPE_UPM		PSCI_TOS_UP_MIG_CAP
+#define OPTEE_TYPE_MP		PSCI_TOS_NOT_PRESENT_MP
+
+/*******************************************************************************
+ * OPTEE migrate type information as known to the OPTEED. We assume that
+ * the OPTEED is dealing with an MP Secure Payload.
+ ******************************************************************************/
+#define OPTEE_MIGRATE_INFO		OPTEE_TYPE_MP
+
+/*******************************************************************************
+ * Number of cpus that the present on this platform. TODO: Rely on a topology
+ * tree to determine this in the future to avoid assumptions about mpidr
+ * allocation
+ ******************************************************************************/
+#define OPTEED_CORE_COUNT		PLATFORM_CORE_COUNT
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define OPTEED_C_RT_CTX_X19		0x0
+#define OPTEED_C_RT_CTX_X20		0x8
+#define OPTEED_C_RT_CTX_X21		0x10
+#define OPTEED_C_RT_CTX_X22		0x18
+#define OPTEED_C_RT_CTX_X23		0x20
+#define OPTEED_C_RT_CTX_X24		0x28
+#define OPTEED_C_RT_CTX_X25		0x30
+#define OPTEED_C_RT_CTX_X26		0x38
+#define OPTEED_C_RT_CTX_X27		0x40
+#define OPTEED_C_RT_CTX_X28		0x48
+#define OPTEED_C_RT_CTX_X29		0x50
+#define OPTEED_C_RT_CTX_X30		0x58
+#define OPTEED_C_RT_CTX_SIZE		0x60
+#define OPTEED_C_RT_CTX_ENTRIES		(OPTEED_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#include <lib/cassert.h>
+
+typedef uint32_t optee_vector_isn_t;
+
+typedef struct optee_vectors {
+	optee_vector_isn_t yield_smc_entry;
+	optee_vector_isn_t fast_smc_entry;
+	optee_vector_isn_t cpu_on_entry;
+	optee_vector_isn_t cpu_off_entry;
+	optee_vector_isn_t cpu_resume_entry;
+	optee_vector_isn_t cpu_suspend_entry;
+	optee_vector_isn_t fiq_entry;
+	optee_vector_isn_t system_off_entry;
+	optee_vector_isn_t system_reset_entry;
+} optee_vectors_t;
+
+/*
+ * The number of arguments to save during a SMC call for OPTEE.
+ * Currently only x1 and x2 are used by OPTEE.
+ */
+#define OPTEE_NUM_ARGS	0x2
+
+/* AArch64 callee saved general purpose register context structure. */
+DEFINE_REG_STRUCT(c_rt_regs, OPTEED_C_RT_CTX_ENTRIES);
+
+/*
+ * Compile time assertion to ensure that both the compiler and linker
+ * have the same double word aligned view of the size of the C runtime
+ * register context.
+ */
+CASSERT(OPTEED_C_RT_CTX_SIZE == sizeof(c_rt_regs_t),	\
+	assert_spd_c_rt_regs_size_mismatch);
+
+/*******************************************************************************
+ * Structure which helps the OPTEED to maintain the per-cpu state of OPTEE.
+ * 'state'          - collection of flags to track OPTEE state e.g. on/off
+ * 'mpidr'          - mpidr to associate a context with a cpu
+ * 'c_rt_ctx'       - stack address to restore C runtime context from after
+ *                    returning from a synchronous entry into OPTEE.
+ * 'cpu_ctx'        - space to maintain OPTEE architectural state
+ ******************************************************************************/
+typedef struct optee_context {
+	uint32_t state;
+	uint64_t mpidr;
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+} optee_context_t;
+
+/* OPTEED power management handlers */
+extern const spd_pm_ops_t opteed_pm;
+
+/*******************************************************************************
+ * Forward declarations
+ ******************************************************************************/
+struct optee_vectors;
+
+/*******************************************************************************
+ * Function & Data prototypes
+ ******************************************************************************/
+uint64_t opteed_enter_sp(uint64_t *c_rt_ctx);
+void __dead2 opteed_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
+uint64_t opteed_synchronous_sp_entry(optee_context_t *optee_ctx);
+void __dead2 opteed_synchronous_sp_exit(optee_context_t *optee_ctx, uint64_t ret);
+void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point,
+				uint32_t rw,
+				uint64_t pc,
+				uint64_t pageable_part,
+				uint64_t mem_limit,
+				uint64_t dt_addr,
+				optee_context_t *optee_ctx);
+
+extern optee_context_t opteed_sp_context[OPTEED_CORE_COUNT];
+extern uint32_t opteed_rw;
+extern struct optee_vectors *optee_vector_table;
+#endif /*__ASSEMBLER__*/
+
+#endif /* OPTEED_PRIVATE_H */
diff --git a/services/spd/opteed/teesmc_opteed.h b/services/spd/opteed/teesmc_opteed.h
new file mode 100644
index 0000000..c82b58a
--- /dev/null
+++ b/services/spd/opteed/teesmc_opteed.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* Copyright (c) 2014, Linaro Limited. All rights reserved. */
+
+#ifndef TEESMC_OPTEED_H
+#define TEESMC_OPTEED_H
+
+/*
+ * This file specifies SMC function IDs used when returning from TEE to the
+ * secure monitor.
+ *
+ * All SMC Function IDs indicates SMC32 Calling Convention but will carry
+ * full 64 bit values in the argument registers if invoked from Aarch64
+ * mode. This violates the SMC Calling Convention, but since this
+ * convention only coveres API towards Normal World it's something that
+ * only concerns the OP-TEE Dispatcher in Trusted Firmware-A and OP-TEE
+ * OS at Secure EL1.
+ */
+
+/*
+ * Issued when returning from initial entry.
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_ENTRY_DONE
+ * r1/x1	Pointer to entry vector
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_ENTRY_DONE		0
+#define TEESMC_OPTEED_RETURN_ENTRY_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_ENTRY_DONE)
+
+
+
+/*
+ * Issued when returning from "cpu_on" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_ON_DONE
+ * r1/x1	0 on success and anything else to indicate error condition
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_ON_DONE		1
+#define TEESMC_OPTEED_RETURN_ON_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_ON_DONE)
+
+/*
+ * Issued when returning from "cpu_off" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_OFF_DONE
+ * r1/x1	0 on success and anything else to indicate error condition
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_OFF_DONE		2
+#define TEESMC_OPTEED_RETURN_OFF_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_OFF_DONE)
+
+/*
+ * Issued when returning from "cpu_suspend" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_SUSPEND_DONE
+ * r1/x1	0 on success and anything else to indicate error condition
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_SUSPEND_DONE	3
+#define TEESMC_OPTEED_RETURN_SUSPEND_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_SUSPEND_DONE)
+
+/*
+ * Issued when returning from "cpu_resume" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_RESUME_DONE
+ * r1/x1	0 on success and anything else to indicate error condition
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_RESUME_DONE		4
+#define TEESMC_OPTEED_RETURN_RESUME_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_RESUME_DONE)
+
+/*
+ * Issued when returning from "std_smc" or "fast_smc" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_CALL_DONE
+ * r1-4/x1-4	Return value 0-3 which will passed to normal world in
+ *		r0-3/x0-3
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_CALL_DONE		5
+#define TEESMC_OPTEED_RETURN_CALL_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_CALL_DONE)
+
+/*
+ * Issued when returning from "fiq" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_FIQ_DONE
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_FIQ_DONE		6
+#define TEESMC_OPTEED_RETURN_FIQ_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_FIQ_DONE)
+
+/*
+ * Issued when returning from "system_off" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_SYSTEM_OFF_DONE
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_SYSTEM_OFF_DONE	7
+#define TEESMC_OPTEED_RETURN_SYSTEM_OFF_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_SYSTEM_OFF_DONE)
+
+/*
+ * Issued when returning from "system_reset" vector
+ *
+ * Register usage:
+ * r0/x0	SMC Function ID, TEESMC_OPTEED_RETURN_SYSTEM_RESET_DONE
+ */
+#define TEESMC_OPTEED_FUNCID_RETURN_SYSTEM_RESET_DONE	8
+#define TEESMC_OPTEED_RETURN_SYSTEM_RESET_DONE \
+	TEESMC_OPTEED_RV(TEESMC_OPTEED_FUNCID_RETURN_SYSTEM_RESET_DONE)
+
+#endif /*TEESMC_OPTEED_H*/
diff --git a/services/spd/opteed/teesmc_opteed_macros.h b/services/spd/opteed/teesmc_opteed_macros.h
new file mode 100644
index 0000000..9d8a169
--- /dev/null
+++ b/services/spd/opteed/teesmc_opteed_macros.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef TEESMC_OPTEED_MACROS_H
+#define TEESMC_OPTEED_MACROS_H
+
+#include <common/runtime_svc.h>
+
+#define TEESMC_OPTEED_RV(func_num) \
+		((SMC_TYPE_FAST << FUNCID_TYPE_SHIFT) | \
+		 ((SMC_32) << FUNCID_CC_SHIFT) | \
+		 (62 << FUNCID_OEN_SHIFT) | \
+		 ((func_num) & FUNCID_NUM_MASK))
+
+#endif /* TEESMC_OPTEED_MACROS_H */
diff --git a/services/spd/pncd/pncd.mk b/services/spd/pncd/pncd.mk
new file mode 100644
index 0000000..0f8eb25
--- /dev/null
+++ b/services/spd/pncd/pncd.mk
@@ -0,0 +1,24 @@
+# Copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+PNCD_DIR		:=	services/spd/pncd
+SPD_INCLUDES		:=	-Iinclude/bl32/pnc
+SPD_INCLUDES		+=	-Iinclude/common/
+
+SPD_SOURCES		:=	services/spd/pncd/pncd_common.c		\
+				services/spd/pncd/pncd_helpers.S	\
+				services/spd/pncd/pncd_main.c
+
+NEED_BL32		:=	yes
+
+# The following constants need to be defined:
+#   - SPD_PNCD_NS_IRQ: IRQ number used to notify NS world when SMC_ACTION_FROM_S is received
+#   - SPD_PNCD_S_IRQ: IRQ number used to notify S world when SMC_ACTION_FROM_NS is received
+$(eval $(call assert_numerics, SPD_PNCD_NS_IRQ SPD_PNCD_S_IRQ))
+
+$(eval $(call add_defines,\
+    $(sort \
+        SPD_PNCD_NS_IRQ \
+        SPD_PNCD_S_IRQ \
+)))
diff --git a/services/spd/pncd/pncd_common.c b/services/spd/pncd/pncd_common.c
new file mode 100644
index 0000000..6fdb629
--- /dev/null
+++ b/services/spd/pncd/pncd_common.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/utils.h>
+#include <plat/common/platform.h>
+
+#include "pncd_private.h"
+
+/*******************************************************************************
+ * Given a secure payload entrypoint info pointer, entry point PC & pointer to a
+ * context data structure, this function will initialize pnc context and entry
+ * point info for the secure payload
+ ******************************************************************************/
+void pncd_init_pnc_ep_state(struct entry_point_info *pnc_entry_point,
+				uint64_t pc,
+				pnc_context_t *pnc_ctx)
+{
+	uint32_t ep_attr;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(pnc_ctx);
+	assert(pnc_entry_point);
+	assert(pc);
+
+	/* Associate this context with the current cpu */
+	pnc_ctx->mpidr = read_mpidr();
+
+	cm_set_context(&pnc_ctx->cpu_ctx, SECURE);
+
+	/* initialise an entrypoint to set up the CPU context */
+	ep_attr = SECURE | EP_ST_ENABLE;
+	if (read_sctlr_el3() & SCTLR_EE_BIT) {
+		ep_attr |= EP_EE_BIG;
+	}
+	SET_PARAM_HEAD(pnc_entry_point, PARAM_EP, VERSION_1, ep_attr);
+
+	pnc_entry_point->pc = pc;
+	pnc_entry_point->spsr = SPSR_64(MODE_EL1,
+					MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+	memset(&pnc_entry_point->args, 0, sizeof(pnc_entry_point->args));
+}
+
+/*******************************************************************************
+ * This function takes an SP context pointer and:
+ * 1. Applies the S-EL1 system register context from pnc_ctx->cpu_ctx.
+ * 2. Saves the current C runtime state (callee saved registers) on the stack
+ *    frame and saves a reference to this state.
+ * 3. Calls el3_exit() so that the EL3 system and general purpose registers
+ *    from the pnc_ctx->cpu_ctx are used to enter the secure payload image.
+ ******************************************************************************/
+uint64_t pncd_synchronous_sp_entry(pnc_context_t *pnc_ctx)
+{
+	assert(pnc_ctx != NULL);
+	assert(pnc_ctx->c_rt_ctx == 0U);
+
+	/* Apply the Secure EL1 system register context and switch to it */
+	assert(cm_get_context(SECURE) == &pnc_ctx->cpu_ctx);
+	cm_el1_sysregs_context_restore(SECURE);
+#if CTX_INCLUDE_FPREGS
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(SECURE)));
+#endif
+	cm_set_next_eret_context(SECURE);
+
+	return pncd_enter_sp(&pnc_ctx->c_rt_ctx);
+}
+
+
+/*******************************************************************************
+ * This function takes an SP context pointer and:
+ * 1. Saves the S-EL1 system register context tp pnc_ctx->cpu_ctx.
+ * 2. Restores the current C runtime state (callee saved registers) from the
+ *    stack frame using the reference to this state saved in pncd_enter_sp().
+ * 3. It does not need to save any general purpose or EL3 system register state
+ *    as the generic smc entry routine should have saved those.
+ ******************************************************************************/
+void pncd_synchronous_sp_exit(pnc_context_t *pnc_ctx, uint64_t ret)
+{
+	assert(pnc_ctx != NULL);
+	/* Save the Secure EL1 system register context */
+	assert(cm_get_context(SECURE) == &pnc_ctx->cpu_ctx);
+	cm_el1_sysregs_context_save(SECURE);
+#if CTX_INCLUDE_FPREGS
+	fpregs_context_save(get_fpregs_ctx(cm_get_context(SECURE)));
+#endif
+
+	assert(pnc_ctx->c_rt_ctx != 0);
+	pncd_exit_sp(pnc_ctx->c_rt_ctx, ret);
+
+	/* Should never reach here */
+	panic();
+}
diff --git a/services/spd/pncd/pncd_helpers.S b/services/spd/pncd/pncd_helpers.S
new file mode 100644
index 0000000..736b30f
--- /dev/null
+++ b/services/spd/pncd/pncd_helpers.S
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "pncd_private.h"
+
+	.global	pncd_enter_sp
+	/* ---------------------------------------------
+	 * This function is called with SP_EL0 as stack.
+	 * Here we stash our EL3 callee-saved registers
+	 * on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where
+	 * the address of the C runtime context is to be
+	 * saved.
+	 * ---------------------------------------------
+	 */
+func pncd_enter_sp
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #PNCD_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #PNCD_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #PNCD_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #PNCD_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #PNCD_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #PNCD_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #PNCD_C_RT_CTX_X29]
+
+	/* ---------------------------------------------
+	 * Everything is setup now. el3_exit() will
+	 * use the secure context to restore to the
+	 * general purpose and EL3 system registers to
+	 * ERET into the secure payload.
+	 * ---------------------------------------------
+	 */
+	b	el3_exit
+endfunc pncd_enter_sp
+
+	/* ---------------------------------------------
+	 * This function is called 'x0' pointing to a C
+	 * runtime context saved in pncd_enter_sp(). It
+	 * restores the saved registers and jumps to
+	 * that runtime with 'x0' as the new sp. This
+	 * destroys the C runtime context that had been
+	 * built on the stack below the saved context by
+	 * the caller. Later the second parameter 'x1'
+	 * is passed as return value to the caller
+	 * ---------------------------------------------
+	 */
+	.global pncd_exit_sp
+func pncd_exit_sp
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(PNCD_C_RT_CTX_X19 - PNCD_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(PNCD_C_RT_CTX_X21 - PNCD_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(PNCD_C_RT_CTX_X23 - PNCD_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(PNCD_C_RT_CTX_X25 - PNCD_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(PNCD_C_RT_CTX_X27 - PNCD_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(PNCD_C_RT_CTX_X29 - PNCD_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------
+	 * This should take us back to the instruction
+	 * after the call to the last pncd_enter_sp().
+	 * Place the second parameter to x0 so that the
+	 * caller will see it as a return value from the
+	 * original entry call
+	 * ---------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc pncd_exit_sp
diff --git a/services/spd/pncd/pncd_main.c b/services/spd/pncd/pncd_main.c
new file mode 100644
index 0000000..99c4aa1
--- /dev/null
+++ b/services/spd/pncd/pncd_main.c
@@ -0,0 +1,471 @@
+/*
+ * Copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*******************************************************************************
+ * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a
+ * plug-in component to the Secure Monitor, registered as a runtime service. The
+ * SPD is expected to be a functional extension of the Secure Payload (SP) that
+ * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting
+ * the Trusted OS/Applications range to the dispatcher. The SPD will either
+ * handle the request locally or delegate it to the Secure Payload. It is also
+ * responsible for initialising and maintaining communication with the SP.
+ ******************************************************************************/
+
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <bl31/interrupt_mgmt.h>
+#include <bl_common.h>
+#include <common/debug.h>
+#include <common/ep_info.h>
+#include <drivers/arm/gic_common.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/spinlock.h>
+#include <plat/common/platform.h>
+#include <pnc.h>
+#include "pncd_private.h"
+#include <runtime_svc.h>
+#include <tools_share/uuid.h>
+
+/*******************************************************************************
+ * Structure to keep track of ProvenCore state
+ ******************************************************************************/
+static pnc_context_t pncd_sp_context;
+
+static bool ree_info;
+static uint64_t ree_base_addr;
+static uint64_t ree_length;
+static uint64_t ree_tag;
+
+static bool pnc_initialized;
+
+static spinlock_t smc_handler_lock;
+
+static int pncd_init(void);
+
+static void context_save(unsigned long security_state)
+{
+	assert(sec_state_is_valid(security_state));
+
+	cm_el1_sysregs_context_save((uint32_t) security_state);
+#if CTX_INCLUDE_FPREGS
+	fpregs_context_save(get_fpregs_ctx(cm_get_context(security_state)));
+#endif
+}
+
+static void *context_restore(unsigned long security_state)
+{
+	void *handle;
+
+	assert(sec_state_is_valid(security_state));
+
+	/* Get a reference to the next context */
+	handle = cm_get_context((uint32_t) security_state);
+	assert(handle);
+
+	/* Restore state */
+	cm_el1_sysregs_context_restore((uint32_t) security_state);
+#if CTX_INCLUDE_FPREGS
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(security_state)));
+#endif
+
+	cm_set_next_eret_context((uint32_t) security_state);
+
+	return handle;
+}
+
+static uint64_t pncd_sel1_interrupt_handler(uint32_t id,
+		uint32_t flags, void *handle, void *cookie);
+
+/*******************************************************************************
+ * Switch context to the specified security state and return the targeted
+ * handle. Note that the context may remain unchanged if the switch is not
+ * allowed.
+ ******************************************************************************/
+void *pncd_context_switch_to(unsigned long security_state)
+{
+	unsigned long sec_state_from =
+	    security_state == SECURE ? NON_SECURE : SECURE;
+
+	assert(sec_state_is_valid(security_state));
+
+	/* Check if this is the first world switch */
+	if (!pnc_initialized) {
+		int rc;
+		uint32_t flags;
+
+		assert(sec_state_from == SECURE);
+
+		INFO("PnC initialization done\n");
+
+		/*
+		 * Register an interrupt handler for S-EL1 interrupts
+		 * when generated during code executing in the
+		 * non-secure state.
+		 */
+		flags = 0U;
+		set_interrupt_rm_flag(flags, NON_SECURE);
+		rc = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+				pncd_sel1_interrupt_handler,
+				flags);
+		if (rc != 0) {
+			ERROR("Failed to register S-EL1 interrupt handler (%d)\n",
+			      rc);
+			panic();
+		}
+
+		context_save(SECURE);
+
+		pnc_initialized = true;
+
+		/*
+		 * Release the lock before restoring the EL3 context to
+		 * bl31_main.
+		 */
+		spin_unlock(&smc_handler_lock);
+
+		/*
+		 * SP reports completion. The SPD must have initiated
+		 * the original request through a synchronous entry
+		 * into the SP. Jump back to the original C runtime
+		 * context.
+		 */
+		pncd_synchronous_sp_exit(&pncd_sp_context, (uint64_t) 0x0);
+
+		/* Unreachable */
+		ERROR("Returned from pncd_synchronous_sp_exit... Should not happen\n");
+		panic();
+	}
+
+	/* Check that the world switch is allowed */
+	if (read_mpidr() != pncd_sp_context.mpidr) {
+		if (sec_state_from == SECURE) {
+			/*
+			 * Secure -> Non-Secure world switch initiated on a CPU where there
+			 * should be no Trusted OS running
+			 */
+			WARN("Secure to Non-Secure switch requested on CPU where ProvenCore is not supposed to be running...\n");
+		}
+
+		/*
+		 * Secure or Non-Secure world wants to switch world but there is no Secure
+		 * software on this core
+		 */
+		return cm_get_context((uint32_t) sec_state_from);
+	}
+
+	context_save(sec_state_from);
+
+	return context_restore(security_state);
+}
+
+/*******************************************************************************
+ * This function is the handler registered for S-EL1 interrupts by the PNCD. It
+ * validates the interrupt and upon success arranges entry into the PNC at
+ * 'pnc_sel1_intr_entry()' for handling the interrupt.
+ ******************************************************************************/
+static uint64_t pncd_sel1_interrupt_handler(uint32_t id,
+		uint32_t flags,
+		void *handle,
+		void *cookie)
+{
+	/* Check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+
+	/* Sanity check the pointer to this cpu's context */
+	assert(handle == cm_get_context(NON_SECURE));
+
+	/* switch to PnC */
+	handle = pncd_context_switch_to(SECURE);
+
+	assert(handle != NULL);
+
+	SMC_RET0(handle);
+}
+
+#pragma weak plat_pncd_setup
+int plat_pncd_setup(void)
+{
+	return 0;
+}
+
+/*******************************************************************************
+ * Secure Payload Dispatcher setup. The SPD finds out the SP entrypoint and type
+ * (aarch32/aarch64) if not already known and initialises the context for entry
+ * into the SP for its initialisation.
+ ******************************************************************************/
+static int pncd_setup(void)
+{
+	entry_point_info_t *pnc_ep_info;
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.
+	 *
+	 * TODO: Add support to conditionally include the SPD service
+	 */
+	pnc_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (!pnc_ep_info) {
+		WARN("No PNC provided by BL2 boot loader, Booting device without PNC initialization. SMC`s destined for PNC will return SMC_UNK\n");
+		return 1;
+	}
+
+	/*
+	 * If there's no valid entry point for SP, we return a non-zero value
+	 * signalling failure initializing the service. We bail out without
+	 * registering any handlers
+	 */
+	if (!pnc_ep_info->pc) {
+		return 1;
+	}
+
+	pncd_init_pnc_ep_state(pnc_ep_info,
+			pnc_ep_info->pc,
+			&pncd_sp_context);
+
+	/*
+	 * All PNCD initialization done. Now register our init function with
+	 * BL31 for deferred invocation
+	 */
+	bl31_register_bl32_init(&pncd_init);
+	bl31_set_next_image_type(NON_SECURE);
+
+	return plat_pncd_setup();
+}
+
+/*******************************************************************************
+ * This function passes control to the Secure Payload image (BL32) for the first
+ * time on the primary cpu after a cold boot. It assumes that a valid secure
+ * context has already been created by pncd_setup() which can be directly used.
+ * It also assumes that a valid non-secure context has been initialised by PSCI
+ * so it does not need to save and restore any non-secure state. This function
+ * performs a synchronous entry into the Secure payload. The SP passes control
+ * back to this routine through a SMC.
+ ******************************************************************************/
+static int32_t pncd_init(void)
+{
+	entry_point_info_t *pnc_entry_point;
+	uint64_t rc = 0;
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.
+	 */
+	pnc_entry_point = bl31_plat_get_next_image_ep_info(SECURE);
+	assert(pnc_entry_point);
+
+	cm_init_my_context(pnc_entry_point);
+
+	/*
+	 * Arrange for an entry into the test secure payload. It will be
+	 * returned via PNC_ENTRY_DONE case
+	 */
+	rc = pncd_synchronous_sp_entry(&pncd_sp_context);
+
+	/*
+	 * If everything went well at this point, the return value should be 0.
+	 */
+	return rc == 0;
+}
+
+#pragma weak plat_pncd_smc_handler
+/*******************************************************************************
+ * This function is responsible for handling the platform-specific SMCs in the
+ * Trusted OS/App range as defined in the SMC Calling Convention Document.
+ ******************************************************************************/
+uintptr_t plat_pncd_smc_handler(uint32_t smc_fid,
+		u_register_t x1,
+		u_register_t x2,
+		u_register_t x3,
+		u_register_t x4,
+		void *cookie,
+		void *handle,
+		u_register_t flags)
+{
+	(void) smc_fid;
+	(void) x1;
+	(void) x2;
+	(void) x3;
+	(void) x4;
+	(void) cookie;
+	(void) flags;
+
+	SMC_RET1(handle, SMC_UNK);
+}
+
+/*******************************************************************************
+ * This function is responsible for handling all SMCs in the Trusted OS/App
+ * range as defined in the SMC Calling Convention Document. It is also
+ * responsible for communicating with the Secure payload to delegate work and
+ * return results back to the non-secure state. Lastly it will also return any
+ * information that the secure payload needs to do the work assigned to it.
+ *
+ * It should only be called with the smc_handler_lock held.
+ ******************************************************************************/
+static uintptr_t pncd_smc_handler_unsafe(uint32_t smc_fid,
+		u_register_t x1,
+		u_register_t x2,
+		u_register_t x3,
+		u_register_t x4,
+		void *cookie,
+		void *handle,
+		u_register_t flags)
+{
+	uint32_t ns;
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+
+	assert(ns != 0 || read_mpidr() == pncd_sp_context.mpidr);
+
+	switch (smc_fid) {
+	case SMC_CONFIG_SHAREDMEM:
+		if (ree_info) {
+			/* Do not Yield */
+			SMC_RET0(handle);
+		}
+
+		/*
+		 * Fetch the physical base address (x1) and size (x2) of the
+		 * shared memory allocated by the Non-Secure world. This memory
+		 * will be used by PNC to communicate with the Non-Secure world.
+		 * Verifying the validity of these values is up to the Trusted
+		 * OS.
+		 */
+		ree_base_addr = x1 | (x2 << 32);
+		ree_length = x3;
+		ree_tag = x4;
+
+		INFO("IN SMC_CONFIG_SHAREDMEM: addr=%lx, length=%lx, tag=%lx\n",
+		     (unsigned long) ree_base_addr,
+		     (unsigned long) ree_length,
+		     (unsigned long) ree_tag);
+
+		if ((ree_base_addr % 0x200000) != 0) {
+			SMC_RET1(handle, SMC_UNK);
+		}
+
+		if ((ree_length % 0x200000) != 0) {
+			SMC_RET1(handle, SMC_UNK);
+		}
+
+		ree_info = true;
+
+		/* Do not Yield */
+		SMC_RET4(handle, 0, 0, 0, 0);
+
+		break;
+
+	case SMC_GET_SHAREDMEM:
+		if (ree_info) {
+			x1 = (1U << 16) | ree_tag;
+			x2 = ree_base_addr & 0xFFFFFFFF;
+			x3 = (ree_base_addr >> 32) & 0xFFFFFFFF;
+			x4 = ree_length & 0xFFFFFFFF;
+			SMC_RET4(handle, x1, x2, x3, x4);
+		} else {
+			SMC_RET4(handle, 0, 0, 0, 0);
+		}
+
+		break;
+
+	case SMC_ACTION_FROM_NS:
+		if (ns == 0) {
+			SMC_RET1(handle, SMC_UNK);
+		}
+
+		if (SPD_PNCD_S_IRQ < MIN_PPI_ID) {
+			plat_ic_raise_s_el1_sgi(SPD_PNCD_S_IRQ,
+						pncd_sp_context.mpidr);
+		} else {
+			plat_ic_set_interrupt_pending(SPD_PNCD_S_IRQ);
+		}
+
+		SMC_RET0(handle);
+
+		break;
+
+	case SMC_ACTION_FROM_S:
+		if (ns != 0) {
+			SMC_RET1(handle, SMC_UNK);
+		}
+
+		if (SPD_PNCD_NS_IRQ < MIN_PPI_ID) {
+			/*
+			 * NS SGI is sent to the same core as the one running
+			 * PNC
+			 */
+			plat_ic_raise_ns_sgi(SPD_PNCD_NS_IRQ, read_mpidr());
+		} else {
+			plat_ic_set_interrupt_pending(SPD_PNCD_NS_IRQ);
+		}
+
+		SMC_RET0(handle);
+
+		break;
+
+	case SMC_YIELD:
+		assert(handle == cm_get_context(ns != 0 ? NON_SECURE : SECURE));
+		handle = pncd_context_switch_to(ns != 0 ? SECURE : NON_SECURE);
+
+		assert(handle != NULL);
+
+		SMC_RET0(handle);
+
+		break;
+
+	default:
+		INFO("Unknown smc: %x\n", smc_fid);
+		break;
+	}
+
+	return plat_pncd_smc_handler(smc_fid, x1, x2, x3, x4,
+				     cookie, handle, flags);
+}
+
+static uintptr_t pncd_smc_handler(uint32_t smc_fid,
+		u_register_t x1,
+		u_register_t x2,
+		u_register_t x3,
+		u_register_t x4,
+		void *cookie,
+		void *handle,
+		u_register_t flags)
+{
+	uintptr_t ret;
+
+	/* SMC handling is serialized */
+	spin_lock(&smc_handler_lock);
+	ret = pncd_smc_handler_unsafe(smc_fid, x1, x2, x3, x4, cookie, handle,
+								  flags);
+	spin_unlock(&smc_handler_lock);
+
+	return ret;
+}
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	pncd_fast,
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_FAST,
+	pncd_setup,
+	pncd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for standard SMC calls */
+DECLARE_RT_SVC(
+	pncd_std,
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_YIELD,
+	NULL,
+	pncd_smc_handler
+);
diff --git a/services/spd/pncd/pncd_private.h b/services/spd/pncd/pncd_private.h
new file mode 100644
index 0000000..8c9b634
--- /dev/null
+++ b/services/spd/pncd/pncd_private.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+ * Portions copyright (c) 2021-2022, ProvenRun S.A.S. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __PNCD_PRIVATE_H__
+#define __PNCD_PRIVATE_H__
+
+#ifndef __ASSEMBLER__
+#include <stdint.h>
+#endif /* __ASSEMBLER __ */
+
+#include <context.h>
+#ifndef __ASSEMBLER__
+#include <lib/cassert.h>
+#endif /* __ASSEMBLER __ */
+
+#include <platform_def.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define PNCD_C_RT_CTX_X19		U(0x0)
+#define PNCD_C_RT_CTX_X20		U(0x8)
+#define PNCD_C_RT_CTX_X21		U(0x10)
+#define PNCD_C_RT_CTX_X22		U(0x18)
+#define PNCD_C_RT_CTX_X23		U(0x20)
+#define PNCD_C_RT_CTX_X24		U(0x28)
+#define PNCD_C_RT_CTX_X25		U(0x30)
+#define PNCD_C_RT_CTX_X26		U(0x38)
+#define PNCD_C_RT_CTX_X27		U(0x40)
+#define PNCD_C_RT_CTX_X28		U(0x48)
+#define PNCD_C_RT_CTX_X29		U(0x50)
+#define PNCD_C_RT_CTX_X30		U(0x58)
+#define PNCD_C_RT_CTX_SIZE		U(0x60)
+#define PNCD_C_RT_CTX_ENTRIES		(PNCD_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+/* AArch64 callee saved general purpose register context structure. */
+DEFINE_REG_STRUCT(c_rt_regs, PNCD_C_RT_CTX_ENTRIES);
+
+/*
+ * Compile time assertion to ensure that both the compiler and linker
+ * have the same double word aligned view of the size of the C runtime
+ * register context.
+ */
+CASSERT(sizeof(c_rt_regs_t) == PNCD_C_RT_CTX_SIZE,
+		assert_spd_c_rt_regs_size_mismatch);
+
+/*******************************************************************************
+ * Structure which helps the SPD to maintain the per-cpu state of the SP.
+ * 'mpidr'          - mpidr of the CPU running PNC
+ * 'c_rt_ctx'       - stack address to restore C runtime context from after
+ *                    returning from a synchronous entry into the SP.
+ * 'cpu_ctx'        - space to maintain SP architectural state
+ ******************************************************************************/
+typedef struct pnc_context {
+	uint64_t mpidr;
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+} pnc_context_t;
+
+/*******************************************************************************
+ * Function & Data prototypes
+ ******************************************************************************/
+uint64_t pncd_enter_sp(uint64_t *c_rt_ctx);
+void __dead2 pncd_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
+uint64_t pncd_synchronous_sp_entry(pnc_context_t *pnc_ctx);
+void __dead2 pncd_synchronous_sp_exit(pnc_context_t *pnc_ctx, uint64_t ret);
+void pncd_init_pnc_ep_state(struct entry_point_info *pnc_ep,
+				uint64_t pc,
+				pnc_context_t *pnc_ctx);
+#endif /* __ASSEMBLER__ */
+
+#endif /* __PNCD_PRIVATE_H__ */
diff --git a/services/spd/tlkd/tlkd.mk b/services/spd/tlkd/tlkd.mk
new file mode 100644
index 0000000..56de0a6
--- /dev/null
+++ b/services/spd/tlkd/tlkd.mk
@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifeq (${ERROR_DEPRECATED},0)
+SPD_INCLUDES		:=	-Iinclude/bl32/payloads
+endif
+
+SPD_SOURCES		:=	services/spd/tlkd/tlkd_common.c		\
+				services/spd/tlkd/tlkd_helpers.S	\
+				services/spd/tlkd/tlkd_main.c		\
+				services/spd/tlkd/tlkd_pm.c
diff --git a/services/spd/tlkd/tlkd_common.c b/services/spd/tlkd/tlkd_common.c
new file mode 100644
index 0000000..820bd8a
--- /dev/null
+++ b/services/spd/tlkd/tlkd_common.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <lib/el3_runtime/context_mgmt.h>
+
+#include "tlkd_private.h"
+
+#define AT_MASK		3
+
+/*******************************************************************************
+ * This function helps the SP to translate NS/S virtual addresses.
+ ******************************************************************************/
+uint64_t tlkd_va_translate(uintptr_t va, int type)
+{
+	uint64_t pa;
+
+	if (type & TLK_TRANSLATE_NS_VADDR) {
+
+		/* save secure context */
+		cm_el1_sysregs_context_save(SECURE);
+
+		/* restore non-secure context */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+
+		/* switch NS bit to start using 64-bit, non-secure mappings */
+		write_scr(cm_get_scr_el3(NON_SECURE));
+		isb();
+	}
+
+	int at = type & AT_MASK;
+	switch (at) {
+	case 0:
+		AT(ats12e1r, va);
+		break;
+	case 1:
+		AT(ats12e1w, va);
+		break;
+	case 2:
+		AT(ats12e0r, va);
+		break;
+	case 3:
+		AT(ats12e0w, va);
+		break;
+	default:
+		assert(0); /* Unreachable */
+		break;
+	}
+
+	/* get the (NS/S) physical address */
+	isb();
+	pa = read_par_el1();
+
+	/* Restore secure state */
+	if (type & TLK_TRANSLATE_NS_VADDR) {
+
+		/* restore secure context */
+		cm_el1_sysregs_context_restore(SECURE);
+
+		/* switch NS bit to start using 32-bit, secure mappings */
+		write_scr(cm_get_scr_el3(SECURE));
+		isb();
+	}
+
+	return pa;
+}
+
+/*******************************************************************************
+ * Given a secure payload entrypoint, register width, cpu id & pointer to a
+ * context data structure, this function will create a secure context ready for
+ * programming an entry into the secure payload.
+ ******************************************************************************/
+void tlkd_init_tlk_ep_state(struct entry_point_info *tlk_entry_point,
+			    uint32_t rw,
+			    uint64_t pc,
+			    tlk_context_t *tlk_ctx)
+{
+	uint32_t ep_attr, spsr;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(tlk_ctx);
+	assert(tlk_entry_point);
+	assert(pc);
+
+	/* Associate this context with the cpu specified */
+	tlk_ctx->mpidr = read_mpidr_el1();
+	clr_yield_smc_active_flag(tlk_ctx->state);
+	cm_set_context(&tlk_ctx->cpu_ctx, SECURE);
+
+	if (rw == SP_AARCH64)
+		spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
+	else
+		spsr = SPSR_MODE32(MODE32_svc,
+				   SPSR_T_ARM,
+				   read_sctlr_el3() & SCTLR_EE_BIT,
+				   DISABLE_ALL_EXCEPTIONS);
+
+	/* initialise an entrypoint to set up the CPU context */
+	ep_attr = SECURE | EP_ST_ENABLE;
+	if (read_sctlr_el3() & SCTLR_EE_BIT)
+		ep_attr |= EP_EE_BIG;
+	SET_PARAM_HEAD(tlk_entry_point, PARAM_EP, VERSION_1, ep_attr);
+
+	tlk_entry_point->pc = pc;
+	tlk_entry_point->spsr = spsr;
+}
+
+/*******************************************************************************
+ * This function takes a TLK context pointer and:
+ * 1. Applies the S-EL1 system register context from tlk_ctx->cpu_ctx.
+ * 2. Saves the current C runtime state (callee saved registers) on the stack
+ *    frame and saves a reference to this state.
+ * 3. Calls el3_exit() so that the EL3 system and general purpose registers
+ *    from the tlk_ctx->cpu_ctx are used to enter the secure payload image.
+ ******************************************************************************/
+uint64_t tlkd_synchronous_sp_entry(tlk_context_t *tlk_ctx)
+{
+	uint64_t rc;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(tlk_ctx);
+
+	/* Apply the Secure EL1 system register context and switch to it */
+	assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	rc = tlkd_enter_sp(&tlk_ctx->c_rt_ctx);
+#if ENABLE_ASSERTIONS
+	tlk_ctx->c_rt_ctx = 0;
+#endif
+
+	return rc;
+}
+
+/*******************************************************************************
+ * This function takes a TLK context pointer and:
+ * 1. Saves the S-EL1 system register context to tlk_ctx->cpu_ctx.
+ * 2. Restores the current C runtime state (callee saved registers) from the
+ *    stack frame using reference to this state saved in tlkd_enter_sp().
+ * 3. It does not need to save any general purpose or EL3 system register state
+ *    as the generic smc entry routine should have saved those.
+ ******************************************************************************/
+void tlkd_synchronous_sp_exit(tlk_context_t *tlk_ctx, uint64_t ret)
+{
+	/* Passing a NULL context is a critical programming error */
+	assert(tlk_ctx);
+
+	/* Save the Secure EL1 system register context */
+	assert(cm_get_context(SECURE) == &tlk_ctx->cpu_ctx);
+	cm_el1_sysregs_context_save(SECURE);
+
+	assert(tlk_ctx->c_rt_ctx != 0);
+	tlkd_exit_sp(tlk_ctx->c_rt_ctx, ret);
+
+	/* Should never reach here */
+	assert(0);
+}
diff --git a/services/spd/tlkd/tlkd_helpers.S b/services/spd/tlkd/tlkd_helpers.S
new file mode 100644
index 0000000..6e616a6
--- /dev/null
+++ b/services/spd/tlkd/tlkd_helpers.S
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "tlkd_private.h"
+
+	.global tlkd_enter_sp
+	.global tlkd_exit_sp
+
+	/* ---------------------------------------------
+	 * This function is called with SP_EL0 as stack.
+	 * Here we stash our EL3 callee-saved registers
+	 * on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where
+	 * the address of the C runtime context is to be
+	 * saved.
+	 * ---------------------------------------------
+	 */
+func tlkd_enter_sp
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #TLKD_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #TLKD_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #TLKD_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #TLKD_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #TLKD_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #TLKD_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #TLKD_C_RT_CTX_X29]
+
+	/* ----------------------------------------------
+	 * Everything is setup now. el3_exit() will
+	 * use the secure context to restore to the
+	 * general purpose and EL3 system registers to
+	 * ERET into the secure payload.
+	 * ----------------------------------------------
+	 */
+	b	el3_exit
+endfunc tlkd_enter_sp
+
+	/* ----------------------------------------------
+	 * This function is called with 'x0' pointing to
+	 * a C runtime context saved in tlkd_enter_sp().
+	 * It restores the saved registers and jumps to
+	 * that runtime with 'x0' as the new sp. This
+	 * destroys the C runtime context that had been
+	 * built on the stack below the saved context by
+	 * the caller. Later the second parameter 'x1'
+	 * is passed as return value to the caller
+	 * ----------------------------------------------
+	 */
+func tlkd_exit_sp
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(TLKD_C_RT_CTX_X19 - TLKD_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(TLKD_C_RT_CTX_X21 - TLKD_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(TLKD_C_RT_CTX_X23 - TLKD_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(TLKD_C_RT_CTX_X25 - TLKD_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(TLKD_C_RT_CTX_X27 - TLKD_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(TLKD_C_RT_CTX_X29 - TLKD_C_RT_CTX_SIZE)]
+
+	/* ------------------------------------------------
+	 * This should take us back to the instruction
+	 * after the call to the last tlkd_enter_sp().
+	 * Place the second parameter to x0 so that the
+	 * caller will see it as a return value from the
+	 * original entry call
+	 * ------------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc tlkd_exit_sp
diff --git a/services/spd/tlkd/tlkd_main.c b/services/spd/tlkd/tlkd_main.c
new file mode 100644
index 0000000..ecac435
--- /dev/null
+++ b/services/spd/tlkd/tlkd_main.c
@@ -0,0 +1,546 @@
+/*
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*******************************************************************************
+ * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a
+ * plug-in component to the Secure Monitor, registered as a runtime service. The
+ * SPD is expected to be a functional extension of the Secure Payload (SP) that
+ * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting
+ * the Trusted OS/Applications range to the dispatcher. The SPD will either
+ * handle the request locally or delegate it to the Secure Payload. It is also
+ * responsible for initialising and maintaining communication with the SP.
+ ******************************************************************************/
+#include <assert.h>
+#include <bl31/interrupt_mgmt.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <bl32/payloads/tlk.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+#include <tools_share/uuid.h>
+
+#include "tlkd_private.h"
+
+extern const spd_pm_ops_t tlkd_pm_ops;
+
+/*******************************************************************************
+ * Per-cpu Secure Payload state
+ ******************************************************************************/
+tlk_context_t tlk_ctx;
+
+/*******************************************************************************
+ * CPU number on which TLK booted up
+ ******************************************************************************/
+static uint32_t boot_cpu;
+
+/* TLK UID: RFC-4122 compliant UUID (version-5, sha-1) */
+DEFINE_SVC_UUID2(tlk_uuid,
+	0xc9e911bd, 0xba2b, 0xee52, 0xb1, 0x72,
+	0x46, 0x1f, 0xba, 0x97, 0x7f, 0x63);
+
+static int32_t tlkd_init(void);
+
+/*******************************************************************************
+ * Secure Payload Dispatcher's timer interrupt handler
+ ******************************************************************************/
+static uint64_t tlkd_interrupt_handler(uint32_t id,
+					uint32_t flags,
+					void *handle,
+					void *cookie)
+{
+	cpu_context_t *s_cpu_context;
+	int irq = plat_ic_get_pending_interrupt_id();
+
+	/* acknowledge the interrupt and mark it complete */
+	(void)plat_ic_acknowledge_interrupt();
+	plat_ic_end_of_interrupt(irq);
+
+	/*
+	 * Disable the routing of NS interrupts from secure world to
+	 * EL3 while interrupted on this core.
+	 */
+	disable_intr_rm_local(INTR_TYPE_S_EL1, SECURE);
+
+	/* Check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+	assert(handle == cm_get_context(NON_SECURE));
+
+	/* Save non-secure state */
+	cm_el1_sysregs_context_save(NON_SECURE);
+
+	/* Get a reference to the secure context */
+	s_cpu_context = cm_get_context(SECURE);
+	assert(s_cpu_context);
+
+	/*
+	 * Restore non-secure state. There is no need to save the
+	 * secure system register context since the SP was supposed
+	 * to preserve it during S-EL1 interrupt handling.
+	 */
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	/* Provide the IRQ number to the SPD */
+	SMC_RET4(s_cpu_context, (uint32_t)TLK_IRQ_FIRED, 0, (uint32_t)irq, 0);
+}
+
+/*******************************************************************************
+ * Secure Payload Dispatcher setup. The SPD finds out the SP entrypoint and type
+ * (aarch32/aarch64) if not already known and initialises the context for entry
+ * into the SP for its initialisation.
+ ******************************************************************************/
+static int32_t tlkd_setup(void)
+{
+	entry_point_info_t *tlk_ep_info;
+	uint32_t flags;
+	int32_t ret;
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.
+	 */
+	tlk_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (!tlk_ep_info) {
+		WARN("No SP provided. Booting device without SP"
+			" initialization. SMC`s destined for SP"
+			" will return SMC_UNK\n");
+		return 1;
+	}
+
+	/*
+	 * If there's no valid entry point for SP, we return a non-zero value
+	 * signalling failure initializing the service. We bail out without
+	 * registering any handlers
+	 */
+	if (!tlk_ep_info->pc)
+		return 1;
+
+	/*
+	 * Inspect the SP image's SPSR and determine it's execution state
+	 * i.e whether AArch32 or AArch64.
+	 */
+	tlkd_init_tlk_ep_state(tlk_ep_info,
+		(tlk_ep_info->spsr >> MODE_RW_SHIFT) & MODE_RW_MASK,
+		tlk_ep_info->pc,
+		&tlk_ctx);
+
+	/* get a list of all S-EL1 IRQs from the platform */
+
+	/* register interrupt handler */
+	flags = 0;
+	set_interrupt_rm_flag(flags, NON_SECURE);
+	ret = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+					      tlkd_interrupt_handler,
+					      flags);
+	if (ret != 0) {
+		ERROR("failed to register tlkd interrupt handler (%d)\n", ret);
+	}
+
+	/*
+	 * All TLK SPD initialization done. Now register our init function
+	 * with BL31 for deferred invocation
+	 */
+	bl31_register_bl32_init(&tlkd_init);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function passes control to the Secure Payload image (BL32) for the first
+ * time on the primary cpu after a cold boot. It assumes that a valid secure
+ * context has already been created by tlkd_setup() which can be directly
+ * used. This function performs a synchronous entry into the Secure payload.
+ * The SP passes control back to this routine through a SMC.
+ ******************************************************************************/
+static int32_t tlkd_init(void)
+{
+	entry_point_info_t *tlk_entry_point;
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.
+	 */
+	tlk_entry_point = bl31_plat_get_next_image_ep_info(SECURE);
+	assert(tlk_entry_point);
+
+	cm_init_my_context(tlk_entry_point);
+
+	/*
+	 * TLK runs only on a single CPU. Store the value of the boot
+	 * CPU for sanity checking later.
+	 */
+	boot_cpu = plat_my_core_pos();
+
+	/*
+	 * Arrange for an entry into the test secure payload.
+	 */
+	return tlkd_synchronous_sp_entry(&tlk_ctx);
+}
+
+/*******************************************************************************
+ * This function is responsible for handling all SMCs in the Trusted OS/App
+ * range from the non-secure state as defined in the SMC Calling Convention
+ * Document. It is also responsible for communicating with the Secure payload
+ * to delegate work and return results back to the non-secure state. Lastly it
+ * will also return any information that the secure payload needs to do the
+ * work assigned to it.
+ ******************************************************************************/
+static uintptr_t tlkd_smc_handler(uint32_t smc_fid,
+			 u_register_t x1,
+			 u_register_t x2,
+			 u_register_t x3,
+			 u_register_t x4,
+			 void *cookie,
+			 void *handle,
+			 u_register_t flags)
+{
+	cpu_context_t *ns_cpu_context;
+	gp_regs_t *gp_regs;
+	uint32_t ns;
+	uint64_t par;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(handle);
+
+	/* These SMCs are only supported by a single CPU */
+	if (boot_cpu != plat_my_core_pos())
+		SMC_RET1(handle, SMC_UNK);
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+
+	switch (smc_fid) {
+
+	/*
+	 * This function ID is used by SP to indicate that it was
+	 * preempted by a non-secure world IRQ.
+	 */
+	case TLK_PREEMPTED:
+
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		assert(handle == cm_get_context(SECURE));
+		cm_el1_sysregs_context_save(SECURE);
+
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/*
+		 * Restore non-secure state. There is no need to save the
+		 * secure system register context since the SP was supposed
+		 * to preserve it during S-EL1 interrupt handling.
+		 */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+
+		SMC_RET1(ns_cpu_context, x1);
+
+	/*
+	 * This is a request from the non-secure context to:
+	 *
+	 * a. register shared memory with the SP for storing it's
+	 *    activity logs.
+	 * b. register shared memory with the SP for passing args
+	 *    required for maintaining sessions with the Trusted
+	 *    Applications.
+	 * c. register shared persistent buffers for secure storage
+	 * d. register NS DRAM ranges passed by Cboot
+	 * e. register Root of Trust parameters from Cboot for Verified Boot
+	 * f. open/close sessions
+	 * g. issue commands to the Trusted Apps
+	 * h. resume the preempted yielding SMC call.
+	 */
+	case TLK_REGISTER_LOGBUF:
+	case TLK_REGISTER_REQBUF:
+	case TLK_SS_REGISTER_HANDLER:
+	case TLK_REGISTER_NS_DRAM_RANGES:
+	case TLK_SET_ROOT_OF_TRUST:
+	case TLK_OPEN_TA_SESSION:
+	case TLK_CLOSE_TA_SESSION:
+	case TLK_TA_LAUNCH_OP:
+	case TLK_TA_SEND_EVENT:
+	case TLK_RESUME_FID:
+	case TLK_SET_BL_VERSION:
+	case TLK_LOCK_BL_INTERFACE:
+	case TLK_BL_RPMB_SERVICE:
+
+		if (!ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * This is a fresh request from the non-secure client.
+		 * The parameters are in x1 and x2. Figure out which
+		 * registers need to be preserved, save the non-secure
+		 * state and send the request to the secure payload.
+		 */
+		assert(handle == cm_get_context(NON_SECURE));
+
+		/*
+		 * Check if we are already processing a yielding SMC
+		 * call. Of all the supported fids, only the "resume"
+		 * fid expects the flag to be set.
+		 */
+		if (smc_fid == TLK_RESUME_FID) {
+			if (!get_yield_smc_active_flag(tlk_ctx.state))
+				SMC_RET1(handle, SMC_UNK);
+		} else {
+			if (get_yield_smc_active_flag(tlk_ctx.state))
+				SMC_RET1(handle, SMC_UNK);
+		}
+
+		cm_el1_sysregs_context_save(NON_SECURE);
+
+		/*
+		 * Verify if there is a valid context to use.
+		 */
+		assert(&tlk_ctx.cpu_ctx == cm_get_context(SECURE));
+
+		/*
+		 * Mark the SP state as active.
+		 */
+		set_yield_smc_active_flag(tlk_ctx.state);
+
+		/*
+		 * We are done stashing the non-secure context. Ask the
+		 * secure payload to do the work now.
+		 */
+		cm_el1_sysregs_context_restore(SECURE);
+		cm_set_next_eret_context(SECURE);
+
+		/*
+		 * TLK is a 32-bit Trusted OS and so expects the SMC
+		 * arguments via r0-r7. TLK expects the monitor frame
+		 * registers to be 64-bits long. Hence, we pass x0 in
+		 * r0-r1, x1 in r2-r3, x3 in r4-r5 and x4 in r6-r7.
+		 *
+		 * As smc_fid is a uint32 value, r1 contains 0.
+		 */
+		gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
+		write_ctx_reg(gp_regs, CTX_GPREG_X4, (uint32_t)x2);
+		write_ctx_reg(gp_regs, CTX_GPREG_X5, (uint32_t)(x2 >> 32));
+		write_ctx_reg(gp_regs, CTX_GPREG_X6, (uint32_t)x3);
+		write_ctx_reg(gp_regs, CTX_GPREG_X7, (uint32_t)(x3 >> 32));
+		SMC_RET4(&tlk_ctx.cpu_ctx, smc_fid, 0, (uint32_t)x1,
+			(uint32_t)(x1 >> 32));
+
+	/*
+	 * Translate NS/EL1-S virtual addresses.
+	 *
+	 * x1 = virtual address
+	 * x3 = type (NS/S)
+	 *
+	 * Returns PA:lo in r0, PA:hi in r1.
+	 */
+	case TLK_VA_TRANSLATE:
+
+		/* Should be invoked only by secure world */
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/* NS virtual addresses are 64-bit long */
+		if (x3 & TLK_TRANSLATE_NS_VADDR)
+			x1 = (uint32_t)x1 | (x2 << 32);
+
+		if (!x1)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * TODO: Sanity check x1. This would require platform
+		 * support.
+		 */
+
+		/* virtual address and type: ns/s */
+		par = tlkd_va_translate(x1, x3);
+
+		/* return physical address in r0-r1 */
+		SMC_RET4(handle, (uint32_t)par, (uint32_t)(par >> 32), 0, 0);
+
+	/*
+	 * This is a request from the SP to mark completion of
+	 * a yielding function ID.
+	 */
+	case TLK_REQUEST_DONE:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * Mark the SP state as inactive.
+		 */
+		clr_yield_smc_active_flag(tlk_ctx.state);
+
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/*
+		 * This is a request completion SMC and we must switch to
+		 * the non-secure world to pass the result.
+		 */
+		cm_el1_sysregs_context_save(SECURE);
+
+		/*
+		 * We are done stashing the secure context. Switch to the
+		 * non-secure context and return the result.
+		 */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+		SMC_RET1(ns_cpu_context, x1);
+
+	/*
+	 * This function ID is used only by the SP to indicate it has
+	 * finished initialising itself after a cold boot
+	 */
+	case TLK_ENTRY_DONE:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * SP has been successfully initialized. Register power
+		 * management hooks with PSCI
+		 */
+		psci_register_spd_pm_hook(&tlkd_pm_ops);
+
+		/*
+		 * TLK reports completion. The SPD must have initiated
+		 * the original request through a synchronous entry
+		 * into the SP. Jump back to the original C runtime
+		 * context.
+		 */
+		tlkd_synchronous_sp_exit(&tlk_ctx, x1);
+		break;
+
+	/*
+	 * These function IDs are used only by TLK to indicate it has
+	 * finished:
+	 * 1. suspending itself after an earlier psci cpu_suspend
+	 *    request.
+	 * 2. resuming itself after an earlier psci cpu_suspend
+	 *    request.
+	 * 3. powering down after an earlier psci system_off/system_reset
+	 *    request.
+	 */
+	case TLK_SUSPEND_DONE:
+	case TLK_RESUME_DONE:
+
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * TLK reports completion. TLKD must have initiated the
+		 * original request through a synchronous entry into the SP.
+		 * Jump back to the original C runtime context, and pass x1 as
+		 * return value to the caller
+		 */
+		tlkd_synchronous_sp_exit(&tlk_ctx, x1);
+		break;
+
+	/*
+	 * This function ID is used by SP to indicate that it has completed
+	 * handling the secure interrupt.
+	 */
+	case TLK_IRQ_DONE:
+
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		assert(handle == cm_get_context(SECURE));
+
+		/* save secure world context */
+		cm_el1_sysregs_context_save(SECURE);
+
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/*
+		 * Restore non-secure state. There is no need to save the
+		 * secure system register context since the SP was supposed
+		 * to preserve it during S-EL1 interrupt handling.
+		 */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+
+		SMC_RET0(ns_cpu_context);
+
+	/*
+	 * Return the number of service function IDs implemented to
+	 * provide service to non-secure
+	 */
+	case TOS_CALL_COUNT:
+		SMC_RET1(handle, TLK_NUM_FID);
+
+	/*
+	 * Return TLK's UID to the caller
+	 */
+	case TOS_UID:
+		SMC_UUID_RET(handle, tlk_uuid);
+
+	/*
+	 * Return the version of current implementation
+	 */
+	case TOS_CALL_VERSION:
+		SMC_RET2(handle, TLK_VERSION_MAJOR, TLK_VERSION_MINOR);
+
+	default:
+		WARN("%s: Unhandled SMC: 0x%x\n", __func__, smc_fid);
+		break;
+	}
+
+	SMC_RET1(handle, SMC_UNK);
+}
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tos_fast,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_FAST,
+	tlkd_setup,
+	tlkd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for yielding SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tos_std,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_YIELD,
+	NULL,
+	tlkd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tap_fast,
+
+	OEN_TAP_START,
+	OEN_TAP_END,
+	SMC_TYPE_FAST,
+	NULL,
+	tlkd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for yielding SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tap_std,
+
+	OEN_TAP_START,
+	OEN_TAP_END,
+	SMC_TYPE_YIELD,
+	NULL,
+	tlkd_smc_handler
+);
diff --git a/services/spd/tlkd/tlkd_pm.c b/services/spd/tlkd/tlkd_pm.c
new file mode 100644
index 0000000..ed5bf77
--- /dev/null
+++ b/services/spd/tlkd/tlkd_pm.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <bl32/payloads/tlk.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/psci/psci.h>
+
+#include "tlkd_private.h"
+
+extern tlk_context_t tlk_ctx;
+
+#define MPIDR_CPU0	0x80000000
+
+/*******************************************************************************
+ * Return the type of payload TLKD is dealing with. Report the current
+ * resident cpu (mpidr format) if it is a UP/UP migratable payload.
+ ******************************************************************************/
+static int32_t cpu_migrate_info(u_register_t *resident_cpu)
+{
+	/* the payload runs only on CPU0 */
+	*resident_cpu = MPIDR_CPU0;
+
+	/* Uniprocessor, not migrate capable payload */
+	return PSCI_TOS_NOT_UP_MIG_CAP;
+}
+
+/*******************************************************************************
+ * This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
+ * that it can pass this information to its Trusted Apps.
+ ******************************************************************************/
+static void cpu_suspend_handler(u_register_t suspend_level)
+{
+	gp_regs_t *gp_regs;
+	int cpu = read_mpidr() & MPIDR_CPU_MASK;
+	int32_t rc = 0;
+
+	/*
+	 * TLK runs only on CPU0 and suspends its Trusted Apps during
+	 * SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
+	 */
+	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
+		return;
+
+	/* pass system suspend event to TLK */
+	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
+	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
+
+	/* Program the entry point and enter TLK */
+	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
+
+	/*
+	 * Read the response from TLK. A non-zero return means that
+	 * something went wrong while communicating with it.
+	 */
+	if (rc != 0)
+		panic();
+}
+
+/*******************************************************************************
+ * This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
+ * that it can pass this information to its Trusted Apps.
+ ******************************************************************************/
+static void cpu_resume_handler(u_register_t suspend_level)
+{
+	gp_regs_t *gp_regs;
+	int cpu = read_mpidr() & MPIDR_CPU_MASK;
+	int32_t rc = 0;
+
+	/*
+	 * TLK runs only on CPU0 and resumes its Trusted Apps during
+	 * SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
+	 * exit.
+	 */
+	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
+		return;
+
+	/* pass system resume event to TLK */
+	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
+	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
+
+	/* Program the entry point and enter TLK */
+	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
+
+	/*
+	 * Read the response from TLK. A non-zero return means that
+	 * something went wrong while communicating with it.
+	 */
+	if (rc != 0)
+		panic();
+}
+
+/*******************************************************************************
+ * Structure populated by the Dispatcher to be given a chance to perform any
+ * bookkeeping before PSCI executes a power mgmt.  operation.
+ ******************************************************************************/
+const spd_pm_ops_t tlkd_pm_ops = {
+	.svc_migrate_info = cpu_migrate_info,
+	.svc_suspend = cpu_suspend_handler,
+	.svc_suspend_finish = cpu_resume_handler,
+};
diff --git a/services/spd/tlkd/tlkd_private.h b/services/spd/tlkd/tlkd_private.h
new file mode 100644
index 0000000..5d5d0e8
--- /dev/null
+++ b/services/spd/tlkd/tlkd_private.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef TLKD_PRIVATE_H
+#define TLKD_PRIVATE_H
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <bl31/interrupt_mgmt.h>
+#include <context.h>
+#include <lib/psci/psci.h>
+
+/*
+ * This flag is used by the TLKD to determine if the SP is servicing a yielding
+ * SMC request prior to programming the next entry into the SP e.g. if SP
+ * execution is preempted by a non-secure interrupt and handed control to the
+ * normal world. If another request which is distinct from what the SP was
+ * previously doing arrives, then this flag will be help the TLKD to either
+ * reject the new request or service it while ensuring that the previous context
+ * is not corrupted.
+ */
+#define YIELD_SMC_ACTIVE_FLAG_SHIFT	2
+#define YIELD_SMC_ACTIVE_FLAG_MASK	1
+#define get_yield_smc_active_flag(state)				\
+			(((state) >> YIELD_SMC_ACTIVE_FLAG_SHIFT)	\
+			& YIELD_SMC_ACTIVE_FLAG_MASK)
+#define set_yield_smc_active_flag(state)	((state) |=		\
+					 (1 << YIELD_SMC_ACTIVE_FLAG_SHIFT))
+#define clr_yield_smc_active_flag(state)	((state) &=		\
+					 ~(YIELD_SMC_ACTIVE_FLAG_MASK	\
+					 << YIELD_SMC_ACTIVE_FLAG_SHIFT))
+
+/*******************************************************************************
+ * Translate virtual address received from the NS world
+ ******************************************************************************/
+#define TLK_TRANSLATE_NS_VADDR		4
+
+/*******************************************************************************
+ * Secure Payload execution state information i.e. aarch32 or aarch64
+ ******************************************************************************/
+#define SP_AARCH32		MODE_RW_32
+#define SP_AARCH64		MODE_RW_64
+
+/*******************************************************************************
+ * Number of cpus that the present on this platform. TODO: Rely on a topology
+ * tree to determine this in the future to avoid assumptions about mpidr
+ * allocation
+ ******************************************************************************/
+#define TLKD_CORE_COUNT		PLATFORM_CORE_COUNT
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define TLKD_C_RT_CTX_X19		0x0
+#define TLKD_C_RT_CTX_X20		0x8
+#define TLKD_C_RT_CTX_X21		0x10
+#define TLKD_C_RT_CTX_X22		0x18
+#define TLKD_C_RT_CTX_X23		0x20
+#define TLKD_C_RT_CTX_X24		0x28
+#define TLKD_C_RT_CTX_X25		0x30
+#define TLKD_C_RT_CTX_X26		0x38
+#define TLKD_C_RT_CTX_X27		0x40
+#define TLKD_C_RT_CTX_X28		0x48
+#define TLKD_C_RT_CTX_X29		0x50
+#define TLKD_C_RT_CTX_X30		0x58
+#define TLKD_C_RT_CTX_SIZE		0x60
+#define TLKD_C_RT_CTX_ENTRIES		(TLKD_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#include <lib/cassert.h>
+
+/* AArch64 callee saved general purpose register context structure. */
+DEFINE_REG_STRUCT(c_rt_regs, TLKD_C_RT_CTX_ENTRIES);
+
+/*
+ * Compile time assertion to ensure that both the compiler and linker
+ * have the same double word aligned view of the size of the C runtime
+ * register context.
+ */
+CASSERT(TLKD_C_RT_CTX_SIZE == sizeof(c_rt_regs_t),	\
+	assert_tlkd_c_rt_regs_size_mismatch);
+
+/*******************************************************************************
+ * Structure which helps the SPD to maintain the per-cpu state of the SP.
+ * 'state'          - collection of flags to track SP state e.g. on/off
+ * 'mpidr'          - mpidr to associate a context with a cpu
+ * 'c_rt_ctx'       - stack address to restore C runtime context from after
+ *                    returning from a synchronous entry into the SP.
+ * 'cpu_ctx'        - space to maintain SP architectural state
+ * 'saved_tsp_args' - space to store arguments for TSP arithmetic operations
+ *                    which will queried using the TSP_GET_ARGS SMC by TSP.
+ ******************************************************************************/
+typedef struct tlk_context {
+	uint32_t state;
+	uint64_t mpidr;
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+} tlk_context_t;
+
+/*******************************************************************************
+ * Function & Data prototypes
+ ******************************************************************************/
+uint64_t tlkd_va_translate(uintptr_t va, int type);
+uint64_t tlkd_enter_sp(uint64_t *c_rt_ctx);
+void __dead2 tlkd_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
+uint64_t tlkd_synchronous_sp_entry(tlk_context_t *tlk_ctx);
+void __dead2 tlkd_synchronous_sp_exit(tlk_context_t *tlk_ctx,
+			uint64_t ret);
+void tlkd_init_tlk_ep_state(struct entry_point_info *tlk_entry_point,
+				uint32_t rw,
+				uint64_t pc,
+				tlk_context_t *tlk_ctx);
+
+#endif /*__ASSEMBLER__*/
+
+#endif /* TLKD_PRIVATE_H */
diff --git a/services/spd/trusty/generic-arm64-smcall.c b/services/spd/trusty/generic-arm64-smcall.c
new file mode 100644
index 0000000..5c3a628
--- /dev/null
+++ b/services/spd/trusty/generic-arm64-smcall.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <platform_def.h>
+
+#include "generic-arm64-smcall.h"
+
+#ifndef PLAT_ARM_GICD_BASE
+#ifdef GICD_BASE
+#define PLAT_ARM_GICD_BASE GICD_BASE
+#define PLAT_ARM_GICC_BASE GICC_BASE
+#ifdef GICR_BASE
+#define PLAT_ARM_GICR_BASE GICR_BASE
+#endif
+#else
+#error PLAT_ARM_GICD_BASE or GICD_BASE must be defined
+#endif
+#endif
+
+#ifndef PLAT_ARM_GICR_BASE
+#define PLAT_ARM_GICR_BASE SMC_UNK
+#endif
+
+int trusty_disable_serial_debug;
+
+struct dputc_state {
+	char linebuf[128];
+	unsigned l;
+};
+
+static struct dputc_state dputc_state[2];
+
+static void trusty_dputc(char ch, int secure)
+{
+	unsigned i;
+	struct dputc_state *s = &dputc_state[!secure];
+
+	if (trusty_disable_serial_debug)
+		return;
+
+	s->linebuf[s->l++] = ch;
+	if (s->l == sizeof(s->linebuf) || ch == '\n') {
+		if (secure)
+			printf("secure os: ");
+		else
+			printf("non-secure os: ");
+		for (i = 0; i < s->l; i++) {
+			putchar(s->linebuf[i]);
+		}
+		if (ch != '\n') {
+			printf(" <...>\n");
+		}
+		s->l = 0;
+	}
+}
+
+static uint64_t trusty_get_reg_base(uint32_t reg)
+{
+	switch (reg) {
+	case SMC_GET_GIC_BASE_GICD:
+		return PLAT_ARM_GICD_BASE;
+
+	case SMC_GET_GIC_BASE_GICC:
+		return PLAT_ARM_GICC_BASE;
+
+	case SMC_GET_GIC_BASE_GICR:
+		return PLAT_ARM_GICR_BASE;
+
+	default:
+		NOTICE("%s(0x%x) unknown reg\n", __func__, reg);
+		return SMC_UNK;
+	}
+}
+
+static uintptr_t trusty_generic_platform_smc(uint32_t smc_fid,
+			 u_register_t x1,
+			 u_register_t x2,
+			 u_register_t x3,
+			 u_register_t x4,
+			 void *cookie,
+			 void *handle,
+			 u_register_t flags)
+{
+	switch (smc_fid) {
+	case SMC_FC_DEBUG_PUTC:
+		trusty_dputc(x1, is_caller_secure(flags));
+		SMC_RET1(handle, 0);
+
+	case SMC_FC_GET_REG_BASE:
+	case SMC_FC64_GET_REG_BASE:
+		SMC_RET1(handle, trusty_get_reg_base(x1));
+
+	default:
+		NOTICE("%s(0x%x, 0x%lx) unknown smc\n", __func__, smc_fid, x1);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	trusty_fast,
+
+	SMC_ENTITY_PLATFORM_MONITOR,
+	SMC_ENTITY_PLATFORM_MONITOR,
+	SMC_TYPE_FAST,
+	NULL,
+	trusty_generic_platform_smc
+);
+
diff --git a/services/spd/trusty/generic-arm64-smcall.h b/services/spd/trusty/generic-arm64-smcall.h
new file mode 100644
index 0000000..ac03469
--- /dev/null
+++ b/services/spd/trusty/generic-arm64-smcall.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "smcall.h"
+
+#define	SMC_ENTITY_PLATFORM_MONITOR	61
+
+/*
+ * SMC calls implemented by EL3 monitor
+ */
+
+/*
+ * Write character in r1 to debug console
+ */
+#define SMC_FC_DEBUG_PUTC	SMC_FASTCALL_NR(SMC_ENTITY_PLATFORM_MONITOR, 0x0)
+
+/*
+ * Get register base address
+ * r1: SMC_GET_GIC_BASE_GICD or SMC_GET_GIC_BASE_GICC
+ */
+#define SMC_GET_GIC_BASE_GICD	0
+#define SMC_GET_GIC_BASE_GICC	1
+#define SMC_GET_GIC_BASE_GICR	2
+#define SMC_FC_GET_REG_BASE	SMC_FASTCALL_NR(SMC_ENTITY_PLATFORM_MONITOR, 0x1)
+#define SMC_FC64_GET_REG_BASE	SMC_FASTCALL64_NR(SMC_ENTITY_PLATFORM_MONITOR, 0x1)
diff --git a/services/spd/trusty/sm_err.h b/services/spd/trusty/sm_err.h
new file mode 100644
index 0000000..80a8748
--- /dev/null
+++ b/services/spd/trusty/sm_err.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SM_ERR_H
+#define SM_ERR_H
+
+/* Errors from the secure monitor */
+#define SM_ERR_UNDEFINED_SMC		0xFFFFFFFF /* Unknown SMC (defined by ARM DEN 0028A(0.9.0) */
+#define SM_ERR_INVALID_PARAMETERS	-2
+#define SM_ERR_INTERRUPTED		-3	/* Got interrupted. Call back with restart SMC */
+#define SM_ERR_UNEXPECTED_RESTART	-4	/* Got an restart SMC when we didn't expect it */
+#define SM_ERR_BUSY			-5	/* Temporarily busy. Call back with original args */
+#define SM_ERR_INTERLEAVED_SMC		-6	/* Got a trusted_service SMC when a restart SMC is required */
+#define SM_ERR_INTERNAL_FAILURE		-7	/* Unknown error */
+#define SM_ERR_NOT_SUPPORTED		-8
+#define SM_ERR_NOT_ALLOWED		-9	/* SMC call not allowed */
+#define SM_ERR_END_OF_INPUT		-10
+
+#endif /* SM_ERR_H */
diff --git a/services/spd/trusty/smcall.h b/services/spd/trusty/smcall.h
new file mode 100644
index 0000000..c66f7db
--- /dev/null
+++ b/services/spd/trusty/smcall.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SMCALL_H
+#define SMCALL_H
+
+#define SMC_NUM_ENTITIES	64U
+#define SMC_NUM_ARGS		4U
+#define SMC_NUM_PARAMS		(SMC_NUM_ARGS - 1U)
+
+#define SMC_IS_FASTCALL(smc_nr)	((smc_nr) & 0x80000000U)
+#define SMC_IS_SMC64(smc_nr)	((smc_nr) & 0x40000000U)
+#define SMC_ENTITY(smc_nr)	(((smc_nr) & 0x3F000000U) >> 24U)
+#define SMC_FUNCTION(smc_nr)	((smc_nr) & 0x0000FFFFU)
+
+#define SMC_NR(entity, fn, fastcall, smc64)			\
+		(((((uint32_t)(fastcall)) & 0x1U) << 31U) |	\
+		(((smc64) & 0x1U) << 30U) |			\
+		(((entity) & 0x3FU) << 24U) |			\
+		((fn) & 0xFFFFU))
+
+#define SMC_FASTCALL_NR(entity, fn)	SMC_NR((entity), (fn), 1U, 0U)
+#define SMC_FASTCALL64_NR(entity, fn)	SMC_NR((entity), (fn), 1U, 1U)
+#define SMC_YIELDCALL_NR(entity, fn)	SMC_NR((entity), (fn), 0U, 0U)
+#define SMC_YIELDCALL64_NR(entity, fn)	SMC_NR((entity), (fn), 0U, 1U)
+
+#define	SMC_ENTITY_ARCH			0U	/* ARM Architecture calls */
+#define	SMC_ENTITY_CPU			1U	/* CPU Service calls */
+#define	SMC_ENTITY_SIP			2U	/* SIP Service calls */
+#define	SMC_ENTITY_OEM			3U	/* OEM Service calls */
+#define	SMC_ENTITY_STD			4U	/* Standard Service calls */
+#define	SMC_ENTITY_RESERVED		5U	/* Reserved for future use */
+#define	SMC_ENTITY_TRUSTED_APP		48U	/* Trusted Application calls */
+#define	SMC_ENTITY_TRUSTED_OS		50U	/* Trusted OS calls */
+#define SMC_ENTITY_LOGGING              51U	/* Used for secure -> nonsecure logging */
+#define	SMC_ENTITY_SECURE_MONITOR	60U	/* Trusted OS calls internal to secure monitor */
+
+/* FC = Fast call, YC = Yielding call */
+#define SMC_YC_RESTART_LAST	SMC_YIELDCALL_NR  (SMC_ENTITY_SECURE_MONITOR, 0U)
+#define SMC_YC_NOP		SMC_YIELDCALL_NR  (SMC_ENTITY_SECURE_MONITOR, 1U)
+
+/*
+ * Return from secure os to non-secure os with return value in r1
+ */
+#define SMC_YC_NS_RETURN	SMC_YIELDCALL_NR  (SMC_ENTITY_SECURE_MONITOR, 0U)
+
+#define SMC_FC_RESERVED		SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 0U)
+#define SMC_FC_FIQ_EXIT		SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 1U)
+#define SMC_FC_REQUEST_FIQ	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 2U)
+#define SMC_FC_GET_NEXT_IRQ	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 3U)
+#define SMC_FC_FIQ_ENTER	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 4U)
+
+#define SMC_FC64_SET_FIQ_HANDLER SMC_FASTCALL64_NR(SMC_ENTITY_SECURE_MONITOR, 5U)
+#define SMC_FC64_GET_FIQ_REGS	SMC_FASTCALL64_NR (SMC_ENTITY_SECURE_MONITOR, 6U)
+
+#define SMC_FC_CPU_SUSPEND	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 7U)
+#define SMC_FC_CPU_RESUME	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 8U)
+
+#define SMC_FC_AARCH_SWITCH	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 9U)
+#define SMC_FC_GET_VERSION_STR	SMC_FASTCALL_NR (SMC_ENTITY_SECURE_MONITOR, 10U)
+
+/* Trusted OS entity calls */
+#define SMC_YC_VIRTIO_GET_DESCR	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 20U)
+#define SMC_YC_VIRTIO_START	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 21U)
+#define SMC_YC_VIRTIO_STOP	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 22U)
+
+#define SMC_YC_VDEV_RESET	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 23U)
+#define SMC_YC_VDEV_KICK_VQ	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 24U)
+#define SMC_YC_SET_ROT_PARAMS	  SMC_YIELDCALL_NR(SMC_ENTITY_TRUSTED_OS, 65535U)
+
+/*
+ * Standard Trusted OS Function IDs that fall under Trusted OS call range
+ * according to SMC calling convention
+ */
+#define SMC_FC64_GET_UUID		SMC_FASTCALL64_NR(63U, 0xFF01U) /* Implementation UID */
+#define SMC_FC_GET_UUID			SMC_FASTCALL_NR(63U, 0xFF01U) /* Implementation.UID */
+
+#endif /* SMCALL_H */
diff --git a/services/spd/trusty/trusty.c b/services/spd/trusty/trusty.c
new file mode 100644
index 0000000..7daebcd
--- /dev/null
+++ b/services/spd/trusty/trusty.c
@@ -0,0 +1,541 @@
+/*
+ * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/smccc.h>
+#include <plat/common/platform.h>
+#include <tools_share/uuid.h>
+
+#include "sm_err.h"
+#include "smcall.h"
+
+/* Trusty UID: RFC-4122 compliant UUID version 4 */
+DEFINE_SVC_UUID2(trusty_uuid,
+		 0x40ee25f0, 0xa2bc, 0x304c, 0x8c, 0x4c,
+		 0xa1, 0x73, 0xc5, 0x7d, 0x8a, 0xf1);
+
+/* macro to check if Hypervisor is enabled in the HCR_EL2 register */
+#define HYP_ENABLE_FLAG		0x286001U
+
+/* length of Trusty's input parameters (in bytes) */
+#define TRUSTY_PARAMS_LEN_BYTES	(4096U * 2)
+
+struct trusty_stack {
+	uint8_t space[PLATFORM_STACK_SIZE] __aligned(16);
+	uint32_t end;
+};
+
+struct trusty_cpu_ctx {
+	cpu_context_t	cpu_ctx;
+	void		*saved_sp;
+	uint32_t	saved_security_state;
+	int32_t		fiq_handler_active;
+	uint64_t	fiq_handler_pc;
+	uint64_t	fiq_handler_cpsr;
+	uint64_t	fiq_handler_sp;
+	uint64_t	fiq_pc;
+	uint64_t	fiq_cpsr;
+	uint64_t	fiq_sp_el1;
+	gp_regs_t	fiq_gpregs;
+	struct trusty_stack	secure_stack;
+};
+
+struct smc_args {
+	uint64_t	r0;
+	uint64_t	r1;
+	uint64_t	r2;
+	uint64_t	r3;
+	uint64_t	r4;
+	uint64_t	r5;
+	uint64_t	r6;
+	uint64_t	r7;
+};
+
+static struct trusty_cpu_ctx trusty_cpu_ctx[PLATFORM_CORE_COUNT];
+
+struct smc_args trusty_init_context_stack(void **sp, void *new_stack);
+struct smc_args trusty_context_switch_helper(void **sp, void *smc_params);
+
+static uint32_t current_vmid;
+
+static struct trusty_cpu_ctx *get_trusty_ctx(void)
+{
+	return &trusty_cpu_ctx[plat_my_core_pos()];
+}
+
+static bool is_hypervisor_mode(void)
+{
+	uint64_t hcr = read_hcr();
+
+	return ((hcr & HYP_ENABLE_FLAG) != 0U) ? true : false;
+}
+
+static struct smc_args trusty_context_switch(uint32_t security_state, uint64_t r0,
+					 uint64_t r1, uint64_t r2, uint64_t r3)
+{
+	struct smc_args args, ret_args;
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+	struct trusty_cpu_ctx *ctx_smc;
+
+	assert(ctx->saved_security_state != security_state);
+
+	args.r7 = 0;
+	if (is_hypervisor_mode()) {
+		/* According to the ARM DEN0028A spec, VMID is stored in x7 */
+		ctx_smc = cm_get_context(NON_SECURE);
+		assert(ctx_smc != NULL);
+		args.r7 = SMC_GET_GP(ctx_smc, CTX_GPREG_X7);
+	}
+	/* r4, r5, r6 reserved for future use. */
+	args.r6 = 0;
+	args.r5 = 0;
+	args.r4 = 0;
+	args.r3 = r3;
+	args.r2 = r2;
+	args.r1 = r1;
+	args.r0 = r0;
+
+	/*
+	 * To avoid the additional overhead in PSCI flow, skip FP context
+	 * saving/restoring in case of CPU suspend and resume, assuming that
+	 * when it's needed the PSCI caller has preserved FP context before
+	 * going here.
+	 */
+	if (r0 != SMC_FC_CPU_SUSPEND && r0 != SMC_FC_CPU_RESUME)
+		fpregs_context_save(get_fpregs_ctx(cm_get_context(security_state)));
+	cm_el1_sysregs_context_save(security_state);
+
+	ctx->saved_security_state = security_state;
+	ret_args = trusty_context_switch_helper(&ctx->saved_sp, &args);
+
+	assert(ctx->saved_security_state == ((security_state == 0U) ? 1U : 0U));
+
+	cm_el1_sysregs_context_restore(security_state);
+	if (r0 != SMC_FC_CPU_SUSPEND && r0 != SMC_FC_CPU_RESUME)
+		fpregs_context_restore(get_fpregs_ctx(cm_get_context(security_state)));
+
+	cm_set_next_eret_context(security_state);
+
+	return ret_args;
+}
+
+static uint64_t trusty_fiq_handler(uint32_t id,
+				   uint32_t flags,
+				   void *handle,
+				   void *cookie)
+{
+	struct smc_args ret;
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+
+	assert(!is_caller_secure(flags));
+
+	ret = trusty_context_switch(NON_SECURE, SMC_FC_FIQ_ENTER, 0, 0, 0);
+	if (ret.r0 != 0U) {
+		SMC_RET0(handle);
+	}
+
+	if (ctx->fiq_handler_active != 0) {
+		INFO("%s: fiq handler already active\n", __func__);
+		SMC_RET0(handle);
+	}
+
+	ctx->fiq_handler_active = 1;
+	(void)memcpy(&ctx->fiq_gpregs, get_gpregs_ctx(handle), sizeof(ctx->fiq_gpregs));
+	ctx->fiq_pc = SMC_GET_EL3(handle, CTX_ELR_EL3);
+	ctx->fiq_cpsr = SMC_GET_EL3(handle, CTX_SPSR_EL3);
+	ctx->fiq_sp_el1 = read_ctx_reg(get_el1_sysregs_ctx(handle), CTX_SP_EL1);
+
+	write_ctx_reg(get_el1_sysregs_ctx(handle), CTX_SP_EL1, ctx->fiq_handler_sp);
+	cm_set_elr_spsr_el3(NON_SECURE, ctx->fiq_handler_pc, (uint32_t)ctx->fiq_handler_cpsr);
+
+	SMC_RET0(handle);
+}
+
+static uint64_t trusty_set_fiq_handler(void *handle, uint64_t cpu,
+			uint64_t handler, uint64_t stack)
+{
+	struct trusty_cpu_ctx *ctx;
+
+	if (cpu >= (uint64_t)PLATFORM_CORE_COUNT) {
+		ERROR("%s: cpu %" PRId64 " >= %d\n", __func__, cpu, PLATFORM_CORE_COUNT);
+		return (uint64_t)SM_ERR_INVALID_PARAMETERS;
+	}
+
+	ctx = &trusty_cpu_ctx[cpu];
+	ctx->fiq_handler_pc = handler;
+	ctx->fiq_handler_cpsr = SMC_GET_EL3(handle, CTX_SPSR_EL3);
+	ctx->fiq_handler_sp = stack;
+
+	SMC_RET1(handle, 0);
+}
+
+static uint64_t trusty_get_fiq_regs(void *handle)
+{
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+	uint64_t sp_el0 = read_ctx_reg(&ctx->fiq_gpregs, CTX_GPREG_SP_EL0);
+
+	SMC_RET4(handle, ctx->fiq_pc, ctx->fiq_cpsr, sp_el0, ctx->fiq_sp_el1);
+}
+
+static uint64_t trusty_fiq_exit(void *handle, uint64_t x1, uint64_t x2, uint64_t x3)
+{
+	struct smc_args ret;
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+
+	if (ctx->fiq_handler_active == 0) {
+		NOTICE("%s: fiq handler not active\n", __func__);
+		SMC_RET1(handle, (uint64_t)SM_ERR_INVALID_PARAMETERS);
+	}
+
+	ret = trusty_context_switch(NON_SECURE, SMC_FC_FIQ_EXIT, 0, 0, 0);
+	if (ret.r0 != 1U) {
+		INFO("%s(%p) SMC_FC_FIQ_EXIT returned unexpected value, %" PRId64 "\n",
+		       __func__, handle, ret.r0);
+	}
+
+	/*
+	 * Restore register state to state recorded on fiq entry.
+	 *
+	 * x0, sp_el1, pc and cpsr need to be restored because el1 cannot
+	 * restore them.
+	 *
+	 * x1-x4 and x8-x17 need to be restored here because smc_handler64
+	 * corrupts them (el1 code also restored them).
+	 */
+	(void)memcpy(get_gpregs_ctx(handle), &ctx->fiq_gpregs, sizeof(ctx->fiq_gpregs));
+	ctx->fiq_handler_active = 0;
+	write_ctx_reg(get_el1_sysregs_ctx(handle), CTX_SP_EL1, ctx->fiq_sp_el1);
+	cm_set_elr_spsr_el3(NON_SECURE, ctx->fiq_pc, (uint32_t)ctx->fiq_cpsr);
+
+	SMC_RET0(handle);
+}
+
+static uintptr_t trusty_smc_handler(uint32_t smc_fid,
+			 u_register_t x1,
+			 u_register_t x2,
+			 u_register_t x3,
+			 u_register_t x4,
+			 void *cookie,
+			 void *handle,
+			 u_register_t flags)
+{
+	struct smc_args ret;
+	uint32_t vmid = 0U;
+	entry_point_info_t *ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+
+	/*
+	 * Return success for SET_ROT_PARAMS if Trusty is not present, as
+	 * Verified Boot is not even supported and returning success here
+	 * would not compromise the boot process.
+	 */
+	if ((ep_info == NULL) && (smc_fid == SMC_YC_SET_ROT_PARAMS)) {
+		SMC_RET1(handle, 0);
+	} else if (ep_info == NULL) {
+		SMC_RET1(handle, SMC_UNK);
+	} else {
+		; /* do nothing */
+	}
+
+	if (is_caller_secure(flags)) {
+		if (smc_fid == SMC_YC_NS_RETURN) {
+			ret = trusty_context_switch(SECURE, x1, 0, 0, 0);
+			SMC_RET8(handle, ret.r0, ret.r1, ret.r2, ret.r3,
+				 ret.r4, ret.r5, ret.r6, ret.r7);
+		}
+		INFO("%s (0x%x, 0x%lx, 0x%lx, 0x%lx, 0x%lx, %p, %p, 0x%lx) \
+		     cpu %d, unknown smc\n",
+		     __func__, smc_fid, x1, x2, x3, x4, cookie, handle, flags,
+		     plat_my_core_pos());
+		SMC_RET1(handle, SMC_UNK);
+	} else {
+		switch (smc_fid) {
+		case SMC_FC64_GET_UUID:
+		case SMC_FC_GET_UUID:
+			/* provide the UUID for the service to the client */
+			SMC_UUID_RET(handle, trusty_uuid);
+			break;
+		case SMC_FC64_SET_FIQ_HANDLER:
+			return trusty_set_fiq_handler(handle, x1, x2, x3);
+		case SMC_FC64_GET_FIQ_REGS:
+			return trusty_get_fiq_regs(handle);
+		case SMC_FC_FIQ_EXIT:
+			return trusty_fiq_exit(handle, x1, x2, x3);
+		default:
+			/* Not all OENs greater than SMC_ENTITY_SECURE_MONITOR are supported */
+			if (SMC_ENTITY(smc_fid) > SMC_ENTITY_SECURE_MONITOR) {
+				VERBOSE("%s: unsupported SMC FID (0x%x)\n", __func__, smc_fid);
+				SMC_RET1(handle, SMC_UNK);
+			}
+
+			if (is_hypervisor_mode())
+				vmid = SMC_GET_GP(handle, CTX_GPREG_X7);
+
+			if ((current_vmid != 0) && (current_vmid != vmid)) {
+				/* This message will cause SMC mechanism
+				 * abnormal in multi-guest environment.
+				 * Change it to WARN in case you need it.
+				 */
+				VERBOSE("Previous SMC not finished.\n");
+				SMC_RET1(handle, SM_ERR_BUSY);
+			}
+			current_vmid = vmid;
+			ret = trusty_context_switch(NON_SECURE, smc_fid, x1,
+				x2, x3);
+			current_vmid = 0;
+			SMC_RET1(handle, ret.r0);
+		}
+	}
+}
+
+static int32_t trusty_init(void)
+{
+	entry_point_info_t *ep_info;
+	struct smc_args zero_args = {0};
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+	uint32_t cpu = plat_my_core_pos();
+	uint64_t reg_width = GET_RW(read_ctx_reg(get_el3state_ctx(&ctx->cpu_ctx),
+			       CTX_SPSR_EL3));
+
+	/*
+	 * Get information about the Trusty image. Its absence is a critical
+	 * failure.
+	 */
+	ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	assert(ep_info != NULL);
+
+	fpregs_context_save(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+	cm_el1_sysregs_context_save(NON_SECURE);
+
+	cm_set_context(&ctx->cpu_ctx, SECURE);
+	cm_init_my_context(ep_info);
+
+	/*
+	 * Adjust secondary cpu entry point for 32 bit images to the
+	 * end of exception vectors
+	 */
+	if ((cpu != 0U) && (reg_width == MODE_RW_32)) {
+		INFO("trusty: cpu %d, adjust entry point to 0x%lx\n",
+		     cpu, ep_info->pc + (1U << 5));
+		cm_set_elr_el3(SECURE, ep_info->pc + (1U << 5));
+	}
+
+	cm_el1_sysregs_context_restore(SECURE);
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(SECURE)));
+	cm_set_next_eret_context(SECURE);
+
+	ctx->saved_security_state = ~0U; /* initial saved state is invalid */
+	(void)trusty_init_context_stack(&ctx->saved_sp, &ctx->secure_stack.end);
+
+	(void)trusty_context_switch_helper(&ctx->saved_sp, &zero_args);
+
+	cm_el1_sysregs_context_restore(NON_SECURE);
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+	cm_set_next_eret_context(NON_SECURE);
+
+	return 1;
+}
+
+static void trusty_cpu_suspend(uint32_t off)
+{
+	struct smc_args ret;
+
+	ret = trusty_context_switch(NON_SECURE, SMC_FC_CPU_SUSPEND, off, 0, 0);
+	if (ret.r0 != 0U) {
+		INFO("%s: cpu %d, SMC_FC_CPU_SUSPEND returned unexpected value, %" PRId64 "\n",
+		     __func__, plat_my_core_pos(), ret.r0);
+	}
+}
+
+static void trusty_cpu_resume(uint32_t on)
+{
+	struct smc_args ret;
+
+	ret = trusty_context_switch(NON_SECURE, SMC_FC_CPU_RESUME, on, 0, 0);
+	if (ret.r0 != 0U) {
+		INFO("%s: cpu %d, SMC_FC_CPU_RESUME returned unexpected value, %" PRId64 "\n",
+		     __func__, plat_my_core_pos(), ret.r0);
+	}
+}
+
+static int32_t trusty_cpu_off_handler(u_register_t max_off_lvl)
+{
+	trusty_cpu_suspend(max_off_lvl);
+
+	return 0;
+}
+
+static void trusty_cpu_on_finish_handler(u_register_t max_off_lvl)
+{
+	struct trusty_cpu_ctx *ctx = get_trusty_ctx();
+
+	if (ctx->saved_sp == NULL) {
+		(void)trusty_init();
+	} else {
+		trusty_cpu_resume(max_off_lvl);
+	}
+}
+
+static void trusty_cpu_suspend_handler(u_register_t max_off_lvl)
+{
+	trusty_cpu_suspend(max_off_lvl);
+}
+
+static void trusty_cpu_suspend_finish_handler(u_register_t max_off_lvl)
+{
+	trusty_cpu_resume(max_off_lvl);
+}
+
+static const spd_pm_ops_t trusty_pm = {
+	.svc_off = trusty_cpu_off_handler,
+	.svc_suspend = trusty_cpu_suspend_handler,
+	.svc_on_finish = trusty_cpu_on_finish_handler,
+	.svc_suspend_finish = trusty_cpu_suspend_finish_handler,
+};
+
+void plat_trusty_set_boot_args(aapcs64_params_t *args);
+
+#if !defined(TSP_SEC_MEM_SIZE) && defined(BL32_MEM_SIZE)
+#define TSP_SEC_MEM_SIZE BL32_MEM_SIZE
+#endif
+
+#ifdef TSP_SEC_MEM_SIZE
+#pragma weak plat_trusty_set_boot_args
+void plat_trusty_set_boot_args(aapcs64_params_t *args)
+{
+	args->arg0 = TSP_SEC_MEM_SIZE;
+}
+#endif
+
+static int32_t trusty_setup(void)
+{
+	entry_point_info_t *ep_info;
+	uint32_t instr;
+	uint32_t flags;
+	int32_t ret;
+	bool aarch32 = false;
+
+	/* Get trusty's entry point info */
+	ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (ep_info == NULL) {
+		VERBOSE("Trusty image missing.\n");
+		return -1;
+	}
+
+	/* memmap first page of trusty's code memory before peeking */
+	ret = mmap_add_dynamic_region(ep_info->pc, /* PA */
+			ep_info->pc, /* VA */
+			PAGE_SIZE, /* size */
+			MT_SECURE | MT_RW_DATA); /* attrs */
+	assert(ret == 0);
+
+	/* peek into trusty's code to see if we have a 32-bit or 64-bit image */
+	instr = *(uint32_t *)ep_info->pc;
+
+	if (instr >> 24 == 0xeaU) {
+		INFO("trusty: Found 32 bit image\n");
+		aarch32 = true;
+	} else if (instr >> 8 == 0xd53810U || instr >> 16 == 0x9400U) {
+		INFO("trusty: Found 64 bit image\n");
+	} else {
+		ERROR("trusty: Found unknown image, 0x%x\n", instr);
+		return -1;
+	}
+
+	/* unmap trusty's memory page */
+	(void)mmap_remove_dynamic_region(ep_info->pc, PAGE_SIZE);
+
+	SET_PARAM_HEAD(ep_info, PARAM_EP, VERSION_1, SECURE | EP_ST_ENABLE);
+	if (!aarch32)
+		ep_info->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+	else
+		ep_info->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM,
+					    SPSR_E_LITTLE,
+					    DAIF_FIQ_BIT |
+					    DAIF_IRQ_BIT |
+					    DAIF_ABT_BIT);
+	(void)memset(&ep_info->args, 0, sizeof(ep_info->args));
+	plat_trusty_set_boot_args(&ep_info->args);
+
+	/* register init handler */
+	bl31_register_bl32_init(trusty_init);
+
+	/* register power management hooks */
+	psci_register_spd_pm_hook(&trusty_pm);
+
+	/* register interrupt handler */
+	flags = 0;
+	set_interrupt_rm_flag(flags, NON_SECURE);
+	ret = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+					      trusty_fiq_handler,
+					      flags);
+	if (ret != 0) {
+		VERBOSE("trusty: failed to register fiq handler, ret = %d\n", ret);
+	}
+
+	if (aarch32) {
+		entry_point_info_t *ns_ep_info;
+		uint32_t spsr;
+
+		ns_ep_info = bl31_plat_get_next_image_ep_info(NON_SECURE);
+		if (ns_ep_info == NULL) {
+			NOTICE("Trusty: non-secure image missing.\n");
+			return -1;
+		}
+		spsr = ns_ep_info->spsr;
+		if (GET_RW(spsr) == MODE_RW_64 && GET_EL(spsr) == MODE_EL2) {
+			spsr &= ~(MODE_EL_MASK << MODE_EL_SHIFT);
+			spsr |= MODE_EL1 << MODE_EL_SHIFT;
+		}
+		if (GET_RW(spsr) == MODE_RW_32 && GET_M32(spsr) == MODE32_hyp) {
+			spsr &= ~(MODE32_MASK << MODE32_SHIFT);
+			spsr |= MODE32_svc << MODE32_SHIFT;
+		}
+		if (spsr != ns_ep_info->spsr) {
+			NOTICE("Trusty: Switch bl33 from EL2 to EL1 (spsr 0x%x -> 0x%x)\n",
+			       ns_ep_info->spsr, spsr);
+			ns_ep_info->spsr = spsr;
+		}
+	}
+
+	return 0;
+}
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	trusty_fast,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_FAST,
+	trusty_setup,
+	trusty_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for yielding SMC calls */
+DECLARE_RT_SVC(
+	trusty_std,
+
+	OEN_TAP_START,
+	SMC_ENTITY_SECURE_MONITOR,
+	SMC_TYPE_YIELD,
+	NULL,
+	trusty_smc_handler
+);
diff --git a/services/spd/trusty/trusty.mk b/services/spd/trusty/trusty.mk
new file mode 100644
index 0000000..43b80bb
--- /dev/null
+++ b/services/spd/trusty/trusty.mk
@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+SPD_INCLUDES		:=
+
+SPD_SOURCES		:=	services/spd/trusty/trusty.c		\
+				services/spd/trusty/trusty_helpers.S
+
+ifeq (${TRUSTY_SPD_WITH_GENERIC_SERVICES},1)
+SPD_SOURCES		+=	services/spd/trusty/generic-arm64-smcall.c
+endif
+
+NEED_BL32		:=	yes
+
+CTX_INCLUDE_FPREGS	:=	1
diff --git a/services/spd/trusty/trusty_helpers.S b/services/spd/trusty/trusty_helpers.S
new file mode 100644
index 0000000..da5cb57
--- /dev/null
+++ b/services/spd/trusty/trusty_helpers.S
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+
+.macro push ra, rb, sp=sp
+	stp \ra, \rb, [\sp,#-16]!
+.endm
+
+.macro pop ra, rb, sp=sp
+	ldp \ra, \rb, [\sp], #16
+.endm
+
+	.global trusty_context_switch_helper
+func trusty_context_switch_helper
+	push	x8, xzr
+	push	x19, x20
+	push	x21, x22
+	push	x23, x24
+	push	x25, x26
+	push	x27, x28
+	push	x29, x30
+
+	mov	x9, sp
+	ldr	x10, [x0]
+	mov	sp, x10
+	str	x9, [x0]
+
+	pop	x29, x30
+	pop	x27, x28
+	pop	x25, x26
+	pop	x23, x24
+	pop	x21, x22
+	pop	x19, x20
+	pop	x8, xzr
+
+        ldr     x2, [x1]
+        ldr     x3, [x1, #0x08]
+        ldr     x4, [x1, #0x10]
+        ldr     x5, [x1, #0x18]
+        ldr     x6, [x1, #0x20]
+        ldr     x7, [x1, #0x28]
+        ldr     x10, [x1, #0x30]
+        ldr     x11, [x1, #0x38]
+
+        stp     x2, x3, [x8]
+        stp     x4, x5, [x8, #16]
+        stp     x6, x7, [x8, #32]
+        stp     x10, x11, [x8, #48]
+
+	ret
+endfunc trusty_context_switch_helper
+
+	.global trusty_init_context_stack
+func trusty_init_context_stack
+	push	x8, xzr, x1
+	push	xzr, xzr, x1
+	push	xzr, xzr, x1
+	push	xzr, xzr, x1
+	push	xzr, xzr, x1
+	push	xzr, xzr, x1
+	adr	x9, el3_exit
+	push	xzr, x9, x1
+	str	x1, [x0]
+	ret
+endfunc trusty_init_context_stack
diff --git a/services/spd/tspd/tspd.mk b/services/spd/tspd/tspd.mk
new file mode 100644
index 0000000..bda8338
--- /dev/null
+++ b/services/spd/tspd/tspd.mk
@@ -0,0 +1,46 @@
+#
+# Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+TSPD_DIR		:=	services/spd/tspd
+
+ifeq (${ERROR_DEPRECATED},0)
+SPD_INCLUDES		:=	-Iinclude/bl32/tsp
+endif
+
+SPD_SOURCES		:=	services/spd/tspd/tspd_common.c		\
+				services/spd/tspd/tspd_helpers.S	\
+				services/spd/tspd/tspd_main.c		\
+				services/spd/tspd/tspd_pm.c
+
+# This dispatcher is paired with a Test Secure Payload source and we intend to
+# build the Test Secure Payload along with this dispatcher.
+#
+# In cases where an associated Secure Payload lies outside this build
+# system/source tree, the the dispatcher Makefile can either invoke an external
+# build command or assume it pre-built
+
+BL32_ROOT		:=	bl32/tsp
+
+# Include SP's Makefile. The assumption is that the TSP's build system is
+# compatible with that of Trusted Firmware, and it'll add and populate necessary
+# build targets and variables
+include ${BL32_ROOT}/tsp.mk
+
+# Let the top-level Makefile know that we intend to build the SP from source
+NEED_BL32		:=	yes
+
+# Flag used to enable routing of non-secure interrupts to EL3 when they are
+# generated while the code is executing in S-EL1/0.
+TSP_NS_INTR_ASYNC_PREEMPT	:=	0
+
+ifeq ($(EL3_EXCEPTION_HANDLING),1)
+ifeq ($(TSP_NS_INTR_ASYNC_PREEMPT),0)
+$(error When EL3_EXCEPTION_HANDLING=1, TSP_NS_INTR_ASYNC_PREEMPT must also be 1)
+endif
+endif
+
+$(eval $(call assert_boolean,TSP_NS_INTR_ASYNC_PREEMPT))
+$(eval $(call add_define,TSP_NS_INTR_ASYNC_PREEMPT))
diff --git a/services/spd/tspd/tspd_common.c b/services/spd/tspd/tspd_common.c
new file mode 100644
index 0000000..063fd01
--- /dev/null
+++ b/services/spd/tspd/tspd_common.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <bl32/tsp/tsp.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/utils.h>
+
+#include "tspd_private.h"
+
+/*******************************************************************************
+ * Given a secure payload entrypoint info pointer, entry point PC, register
+ * width, cpu id & pointer to a context data structure, this function will
+ * initialize tsp context and entry point info for the secure payload
+ ******************************************************************************/
+void tspd_init_tsp_ep_state(struct entry_point_info *tsp_entry_point,
+				uint32_t rw,
+				uint64_t pc,
+				tsp_context_t *tsp_ctx)
+{
+	uint32_t ep_attr;
+
+	/* Passing a NULL context is a critical programming error */
+	assert(tsp_ctx);
+	assert(tsp_entry_point);
+	assert(pc);
+
+	/*
+	 * We support AArch64 TSP for now.
+	 * TODO: Add support for AArch32 TSP
+	 */
+	assert(rw == TSP_AARCH64);
+
+	/* Associate this context with the cpu specified */
+	tsp_ctx->mpidr = read_mpidr_el1();
+	tsp_ctx->state = 0;
+	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_OFF);
+	clr_yield_smc_active_flag(tsp_ctx->state);
+
+	cm_set_context(&tsp_ctx->cpu_ctx, SECURE);
+
+	/* initialise an entrypoint to set up the CPU context */
+	ep_attr = SECURE | EP_ST_ENABLE;
+	if (read_sctlr_el3() & SCTLR_EE_BIT)
+		ep_attr |= EP_EE_BIG;
+	SET_PARAM_HEAD(tsp_entry_point, PARAM_EP, VERSION_1, ep_attr);
+
+	tsp_entry_point->pc = pc;
+	tsp_entry_point->spsr = SPSR_64(MODE_EL1,
+					MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+	zeromem(&tsp_entry_point->args, sizeof(tsp_entry_point->args));
+}
+
+/*******************************************************************************
+ * This function takes an SP context pointer and:
+ * 1. Applies the S-EL1 system register context from tsp_ctx->cpu_ctx.
+ * 2. Saves the current C runtime state (callee saved registers) on the stack
+ *    frame and saves a reference to this state.
+ * 3. Calls el3_exit() so that the EL3 system and general purpose registers
+ *    from the tsp_ctx->cpu_ctx are used to enter the secure payload image.
+ ******************************************************************************/
+uint64_t tspd_synchronous_sp_entry(tsp_context_t *tsp_ctx)
+{
+	uint64_t rc;
+
+	assert(tsp_ctx != NULL);
+	assert(tsp_ctx->c_rt_ctx == 0);
+
+	/* Apply the Secure EL1 system register context and switch to it */
+	assert(cm_get_context(SECURE) == &tsp_ctx->cpu_ctx);
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	rc = tspd_enter_sp(&tsp_ctx->c_rt_ctx);
+#if ENABLE_ASSERTIONS
+	tsp_ctx->c_rt_ctx = 0;
+#endif
+
+	return rc;
+}
+
+
+/*******************************************************************************
+ * This function takes an SP context pointer and:
+ * 1. Saves the S-EL1 system register context tp tsp_ctx->cpu_ctx.
+ * 2. Restores the current C runtime state (callee saved registers) from the
+ *    stack frame using the reference to this state saved in tspd_enter_sp().
+ * 3. It does not need to save any general purpose or EL3 system register state
+ *    as the generic smc entry routine should have saved those.
+ ******************************************************************************/
+void tspd_synchronous_sp_exit(tsp_context_t *tsp_ctx, uint64_t ret)
+{
+	assert(tsp_ctx != NULL);
+	/* Save the Secure EL1 system register context */
+	assert(cm_get_context(SECURE) == &tsp_ctx->cpu_ctx);
+	cm_el1_sysregs_context_save(SECURE);
+
+	assert(tsp_ctx->c_rt_ctx != 0);
+	tspd_exit_sp(tsp_ctx->c_rt_ctx, ret);
+
+	/* Should never reach here */
+	assert(0);
+}
+
+/*******************************************************************************
+ * This function takes an SP context pointer and abort any preempted SMC
+ * request.
+ * Return 1 if there was a preempted SMC request, 0 otherwise.
+ ******************************************************************************/
+int tspd_abort_preempted_smc(tsp_context_t *tsp_ctx)
+{
+	if (!get_yield_smc_active_flag(tsp_ctx->state))
+		return 0;
+
+	/* Abort any preempted SMC request */
+	clr_yield_smc_active_flag(tsp_ctx->state);
+
+	/*
+	 * Arrange for an entry into the test secure payload. It will
+	 * be returned via TSP_ABORT_DONE case in tspd_smc_handler.
+	 */
+	cm_set_elr_el3(SECURE,
+		       (uint64_t) &tsp_vectors->abort_yield_smc_entry);
+	uint64_t rc = tspd_synchronous_sp_entry(tsp_ctx);
+
+	if (rc != 0)
+		panic();
+
+	return 1;
+}
+
diff --git a/services/spd/tspd/tspd_helpers.S b/services/spd/tspd/tspd_helpers.S
new file mode 100644
index 0000000..f15d66b
--- /dev/null
+++ b/services/spd/tspd/tspd_helpers.S
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "tspd_private.h"
+
+	.global	tspd_enter_sp
+	/* ---------------------------------------------
+	 * This function is called with SP_EL0 as stack.
+	 * Here we stash our EL3 callee-saved registers
+	 * on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where
+	 * the address of the C runtime context is to be
+	 * saved.
+	 * ---------------------------------------------
+	 */
+func tspd_enter_sp
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #TSPD_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #TSPD_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #TSPD_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #TSPD_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #TSPD_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #TSPD_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #TSPD_C_RT_CTX_X29]
+
+	/* ---------------------------------------------
+	 * Everything is setup now. el3_exit() will
+	 * use the secure context to restore to the
+	 * general purpose and EL3 system registers to
+	 * ERET into the secure payload.
+	 * ---------------------------------------------
+	 */
+	b	el3_exit
+endfunc tspd_enter_sp
+
+	/* ---------------------------------------------
+	 * This function is called 'x0' pointing to a C
+	 * runtime context saved in tspd_enter_sp().  It
+	 * restores the saved registers and jumps to
+	 * that runtime with 'x0' as the new sp. This
+	 * destroys the C runtime context that had been
+	 * built on the stack below the saved context by
+	 * the caller. Later the second parameter 'x1'
+	 * is passed as return value to the caller
+	 * ---------------------------------------------
+	 */
+	.global tspd_exit_sp
+func tspd_exit_sp
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(TSPD_C_RT_CTX_X19 - TSPD_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(TSPD_C_RT_CTX_X21 - TSPD_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(TSPD_C_RT_CTX_X23 - TSPD_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(TSPD_C_RT_CTX_X25 - TSPD_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(TSPD_C_RT_CTX_X27 - TSPD_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(TSPD_C_RT_CTX_X29 - TSPD_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------
+	 * This should take us back to the instruction
+	 * after the call to the last tspd_enter_sp().
+	 * Place the second parameter to x0 so that the
+	 * caller will see it as a return value from the
+	 * original entry call
+	 * ---------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc tspd_exit_sp
diff --git a/services/spd/tspd/tspd_main.c b/services/spd/tspd/tspd_main.c
new file mode 100644
index 0000000..6cb4992
--- /dev/null
+++ b/services/spd/tspd/tspd_main.c
@@ -0,0 +1,819 @@
+/*
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+/*******************************************************************************
+ * This is the Secure Payload Dispatcher (SPD). The dispatcher is meant to be a
+ * plug-in component to the Secure Monitor, registered as a runtime service. The
+ * SPD is expected to be a functional extension of the Secure Payload (SP) that
+ * executes in Secure EL1. The Secure Monitor will delegate all SMCs targeting
+ * the Trusted OS/Applications range to the dispatcher. The SPD will either
+ * handle the request locally or delegate it to the Secure Payload. It is also
+ * responsible for initialising and maintaining communication with the SP.
+ ******************************************************************************/
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <bl31/ehf.h>
+#include <bl32/tsp/tsp.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+#include <tools_share/uuid.h>
+
+#include "tspd_private.h"
+
+/*******************************************************************************
+ * Address of the entrypoint vector table in the Secure Payload. It is
+ * initialised once on the primary core after a cold boot.
+ ******************************************************************************/
+tsp_vectors_t *tsp_vectors;
+
+/*******************************************************************************
+ * Array to keep track of per-cpu Secure Payload state
+ ******************************************************************************/
+tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
+
+
+/* TSP UID */
+DEFINE_SVC_UUID2(tsp_uuid,
+	0xa056305b, 0x9132, 0x7b42, 0x98, 0x11,
+	0x71, 0x68, 0xca, 0x50, 0xf3, 0xfa);
+
+int32_t tspd_init(void);
+
+/*
+ * This helper function handles Secure EL1 preemption. The preemption could be
+ * due Non Secure interrupts or EL3 interrupts. In both the cases we context
+ * switch to the normal world and in case of EL3 interrupts, it will again be
+ * routed to EL3 which will get handled at the exception vectors.
+ */
+uint64_t tspd_handle_sp_preemption(void *handle)
+{
+	cpu_context_t *ns_cpu_context;
+
+	assert(handle == cm_get_context(SECURE));
+	cm_el1_sysregs_context_save(SECURE);
+	/* Get a reference to the non-secure context */
+	ns_cpu_context = cm_get_context(NON_SECURE);
+	assert(ns_cpu_context);
+
+	/*
+	 * To allow Secure EL1 interrupt handler to re-enter TSP while TSP
+	 * is preempted, the secure system register context which will get
+	 * overwritten must be additionally saved. This is currently done
+	 * by the TSPD S-EL1 interrupt handler.
+	 */
+
+	/*
+	 * Restore non-secure state.
+	 */
+	cm_el1_sysregs_context_restore(NON_SECURE);
+	cm_set_next_eret_context(NON_SECURE);
+
+	/*
+	 * The TSP was preempted during execution of a Yielding SMC Call.
+	 * Return back to the normal world with SMC_PREEMPTED as error
+	 * code in x0.
+	 */
+	SMC_RET1(ns_cpu_context, SMC_PREEMPTED);
+}
+
+/*******************************************************************************
+ * This function is the handler registered for S-EL1 interrupts by the TSPD. It
+ * validates the interrupt and upon success arranges entry into the TSP at
+ * 'tsp_sel1_intr_entry()' for handling the interrupt.
+ * Typically, interrupts for a specific security state get handled in the same
+ * security execption level if the execution is in the same security state. For
+ * example, if a non-secure interrupt gets fired when CPU is executing in NS-EL2
+ * it gets handled in the non-secure world.
+ * However, interrupts belonging to the opposite security state typically demand
+ * a world(context) switch. This is inline with the security principle which
+ * states a secure interrupt has to be handled in the secure world.
+ * Hence, the TSPD in EL3 expects the context(handle) for a secure interrupt to
+ * be non-secure and vice versa.
+ * However, a race condition between non-secure and secure interrupts can lead to
+ * a scenario where the above assumptions do not hold true. This is demonstrated
+ * below through Note 1.
+ ******************************************************************************/
+static uint64_t tspd_sel1_interrupt_handler(uint32_t id,
+					    uint32_t flags,
+					    void *handle,
+					    void *cookie)
+{
+	uint32_t linear_id;
+	tsp_context_t *tsp_ctx;
+
+	/* Get a reference to this cpu's TSP context */
+	linear_id = plat_my_core_pos();
+	tsp_ctx = &tspd_sp_context[linear_id];
+
+#if TSP_NS_INTR_ASYNC_PREEMPT
+
+	/*
+	 * Note 1:
+	 * Under the current interrupt routing model, interrupts from other
+	 * world are routed to EL3 when TSP_NS_INTR_ASYNC_PREEMPT is enabled.
+	 * Consider the following scenario:
+	 * 1/ A non-secure payload(like tftf) requests a secure service from
+	 *    TSP by invoking a yielding SMC call.
+	 * 2/ Later, execution jumps to TSP in S-EL1 with the help of TSP
+	 *    Dispatcher in Secure Monitor(EL3).
+	 * 3/ While CPU is executing TSP, a Non-secure interrupt gets fired.
+	 *    this demands a context switch to the non-secure world through
+	 *    secure monitor.
+	 * 4/ Consequently, TSP in S-EL1 get asynchronously pre-empted and
+	 *    execution switches to secure monitor(EL3).
+	 * 5/ EL3 tries to triage the (Non-secure) interrupt based on the
+	 *    highest pending interrupt.
+	 * 6/ However, while the NS Interrupt was pending, secure timer gets
+	 *    fired which makes a S-EL1 interrupt to be pending.
+	 * 7/ Hence, execution jumps to this companion handler of S-EL1
+	 *    interrupt (i.e., tspd_sel1_interrupt_handler) even though the TSP
+	 *    was pre-empted due to non-secure interrupt.
+	 * 8/ The above sequence of events explain how TSP was pre-empted by
+	 *    S-EL1 interrupt indirectly in an asynchronous way.
+	 * 9/ Hence, we track the TSP pre-emption by S-EL1 interrupt using a
+	 *    boolean variable per each core.
+	 * 10/ This helps us to indicate that SMC call for TSP service was
+	 *    pre-empted when execution resumes in non-secure world.
+	 */
+
+	/* Check the security state when the exception was generated */
+	if (get_interrupt_src_ss(flags) == NON_SECURE) {
+		/* Sanity check the pointer to this cpu's context */
+		assert(handle == cm_get_context(NON_SECURE));
+
+		/* Save the non-secure context before entering the TSP */
+		cm_el1_sysregs_context_save(NON_SECURE);
+		tsp_ctx->preempted_by_sel1_intr = false;
+	} else {
+		/* Sanity check the pointer to this cpu's context */
+		assert(handle == cm_get_context(SECURE));
+
+		/* Save the secure context before entering the TSP for S-EL1
+		 * interrupt handling
+		 */
+		cm_el1_sysregs_context_save(SECURE);
+		tsp_ctx->preempted_by_sel1_intr = true;
+	}
+#else
+	/* Check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+
+	/* Sanity check the pointer to this cpu's context */
+	assert(handle == cm_get_context(NON_SECURE));
+
+	/* Save the non-secure context before entering the TSP */
+	cm_el1_sysregs_context_save(NON_SECURE);
+#endif
+
+	assert(&tsp_ctx->cpu_ctx == cm_get_context(SECURE));
+
+	/*
+	 * Determine if the TSP was previously preempted. Its last known
+	 * context has to be preserved in this case.
+	 * The TSP should return control to the TSPD after handling this
+	 * S-EL1 interrupt. Preserve essential EL3 context to allow entry into
+	 * the TSP at the S-EL1 interrupt entry point using the 'cpu_context'
+	 * structure. There is no need to save the secure system register
+	 * context since the TSP is supposed to preserve it during S-EL1
+	 * interrupt handling.
+	 */
+	if (get_yield_smc_active_flag(tsp_ctx->state)) {
+		tsp_ctx->saved_spsr_el3 = (uint32_t)SMC_GET_EL3(&tsp_ctx->cpu_ctx,
+						      CTX_SPSR_EL3);
+		tsp_ctx->saved_elr_el3 = SMC_GET_EL3(&tsp_ctx->cpu_ctx,
+						     CTX_ELR_EL3);
+#if TSP_NS_INTR_ASYNC_PREEMPT
+		memcpy(&tsp_ctx->sp_ctx, &tsp_ctx->cpu_ctx, TSPD_SP_CTX_SIZE);
+#endif
+	}
+
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_elr_spsr_el3(SECURE, (uint64_t) &tsp_vectors->sel1_intr_entry,
+		    SPSR_64(MODE_EL1, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS));
+
+	cm_set_next_eret_context(SECURE);
+
+	/*
+	 * Tell the TSP that it has to handle a S-EL1 interrupt synchronously.
+	 * Also the instruction in normal world where the interrupt was
+	 * generated is passed for debugging purposes. It is safe to retrieve
+	 * this address from ELR_EL3 as the secure context will not take effect
+	 * until el3_exit().
+	 */
+	SMC_RET2(&tsp_ctx->cpu_ctx, TSP_HANDLE_SEL1_INTR_AND_RETURN, read_elr_el3());
+}
+
+#if TSP_NS_INTR_ASYNC_PREEMPT
+/*******************************************************************************
+ * This function is the handler registered for Non secure interrupts by the
+ * TSPD. It validates the interrupt and upon success arranges entry into the
+ * normal world for handling the interrupt.
+ ******************************************************************************/
+static uint64_t tspd_ns_interrupt_handler(uint32_t id,
+					    uint32_t flags,
+					    void *handle,
+					    void *cookie)
+{
+	/* Check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == SECURE);
+
+	/*
+	 * Disable the routing of NS interrupts from secure world to EL3 while
+	 * interrupted on this core.
+	 */
+	disable_intr_rm_local(INTR_TYPE_NS, SECURE);
+
+	return tspd_handle_sp_preemption(handle);
+}
+#endif
+
+/*******************************************************************************
+ * Secure Payload Dispatcher setup. The SPD finds out the SP entrypoint and type
+ * (aarch32/aarch64) if not already known and initialises the context for entry
+ * into the SP for its initialisation.
+ ******************************************************************************/
+static int32_t tspd_setup(void)
+{
+	entry_point_info_t *tsp_ep_info;
+	uint32_t linear_id;
+
+	linear_id = plat_my_core_pos();
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.  TODO: Add support to
+	 * conditionally include the SPD service
+	 */
+	tsp_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (!tsp_ep_info) {
+		WARN("No TSP provided by BL2 boot loader, Booting device"
+			" without TSP initialization. SMC`s destined for TSP"
+			" will return SMC_UNK\n");
+		return 1;
+	}
+
+	/*
+	 * If there's no valid entry point for SP, we return a non-zero value
+	 * signalling failure initializing the service. We bail out without
+	 * registering any handlers
+	 */
+	if (!tsp_ep_info->pc)
+		return 1;
+
+	/*
+	 * We could inspect the SP image and determine its execution
+	 * state i.e whether AArch32 or AArch64. Assuming it's AArch64
+	 * for the time being.
+	 */
+	tspd_init_tsp_ep_state(tsp_ep_info,
+				TSP_AARCH64,
+				tsp_ep_info->pc,
+				&tspd_sp_context[linear_id]);
+
+#if TSP_INIT_ASYNC
+	bl31_set_next_image_type(SECURE);
+#else
+	/*
+	 * All TSPD initialization done. Now register our init function with
+	 * BL31 for deferred invocation
+	 */
+	bl31_register_bl32_init(&tspd_init);
+#endif
+	return 0;
+}
+
+/*******************************************************************************
+ * This function passes control to the Secure Payload image (BL32) for the first
+ * time on the primary cpu after a cold boot. It assumes that a valid secure
+ * context has already been created by tspd_setup() which can be directly used.
+ * It also assumes that a valid non-secure context has been initialised by PSCI
+ * so it does not need to save and restore any non-secure state. This function
+ * performs a synchronous entry into the Secure payload. The SP passes control
+ * back to this routine through a SMC.
+ ******************************************************************************/
+int32_t tspd_init(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+	entry_point_info_t *tsp_entry_point;
+	uint64_t rc;
+
+	/*
+	 * Get information about the Secure Payload (BL32) image. Its
+	 * absence is a critical failure.
+	 */
+	tsp_entry_point = bl31_plat_get_next_image_ep_info(SECURE);
+	assert(tsp_entry_point);
+
+	cm_init_my_context(tsp_entry_point);
+
+	/*
+	 * Arrange for an entry into the test secure payload. It will be
+	 * returned via TSP_ENTRY_DONE case
+	 */
+	rc = tspd_synchronous_sp_entry(tsp_ctx);
+	assert(rc != 0);
+
+	return rc;
+}
+
+
+/*******************************************************************************
+ * This function is responsible for handling all SMCs in the Trusted OS/App
+ * range from the non-secure state as defined in the SMC Calling Convention
+ * Document. It is also responsible for communicating with the Secure payload
+ * to delegate work and return results back to the non-secure state. Lastly it
+ * will also return any information that the secure payload needs to do the
+ * work assigned to it.
+ ******************************************************************************/
+static uintptr_t tspd_smc_handler(uint32_t smc_fid,
+			 u_register_t x1,
+			 u_register_t x2,
+			 u_register_t x3,
+			 u_register_t x4,
+			 void *cookie,
+			 void *handle,
+			 u_register_t flags)
+{
+	cpu_context_t *ns_cpu_context;
+	uint32_t linear_id = plat_my_core_pos(), ns;
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+	uint64_t rc;
+#if TSP_INIT_ASYNC
+	entry_point_info_t *next_image_info;
+#endif
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+
+	switch (smc_fid) {
+
+	/*
+	 * This function ID is used by TSP to indicate that it was
+	 * preempted by a normal world IRQ.
+	 *
+	 */
+	case TSP_PREEMPTED:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		return tspd_handle_sp_preemption(handle);
+
+	/*
+	 * This function ID is used only by the TSP to indicate that it has
+	 * finished handling a S-EL1 interrupt or was preempted by a higher
+	 * priority pending EL3 interrupt. Execution should resume
+	 * in the normal world.
+	 */
+	case TSP_HANDLED_S_EL1_INTR:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		assert(handle == cm_get_context(SECURE));
+
+		/*
+		 * Restore the relevant EL3 state which saved to service
+		 * this SMC.
+		 */
+		if (get_yield_smc_active_flag(tsp_ctx->state)) {
+			SMC_SET_EL3(&tsp_ctx->cpu_ctx,
+				    CTX_SPSR_EL3,
+				    tsp_ctx->saved_spsr_el3);
+			SMC_SET_EL3(&tsp_ctx->cpu_ctx,
+				    CTX_ELR_EL3,
+				    tsp_ctx->saved_elr_el3);
+#if TSP_NS_INTR_ASYNC_PREEMPT
+			/*
+			 * Need to restore the previously interrupted
+			 * secure context.
+			 */
+			memcpy(&tsp_ctx->cpu_ctx, &tsp_ctx->sp_ctx,
+				TSPD_SP_CTX_SIZE);
+#endif
+		}
+
+		/* Get a reference to the non-secure context */
+		ns_cpu_context = cm_get_context(NON_SECURE);
+		assert(ns_cpu_context);
+
+		/*
+		 * Restore non-secure state. There is no need to save the
+		 * secure system register context since the TSP was supposed
+		 * to preserve it during S-EL1 interrupt handling.
+		 */
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+
+		/* Refer to Note 1 in function tspd_sel1_interrupt_handler()*/
+#if TSP_NS_INTR_ASYNC_PREEMPT
+		if (tsp_ctx->preempted_by_sel1_intr) {
+			/* Reset the flag */
+			tsp_ctx->preempted_by_sel1_intr = false;
+
+			SMC_RET1(ns_cpu_context, SMC_PREEMPTED);
+		} else {
+			SMC_RET0((uint64_t) ns_cpu_context);
+		}
+#else
+		SMC_RET0((uint64_t) ns_cpu_context);
+#endif
+
+
+	/*
+	 * This function ID is used only by the SP to indicate it has
+	 * finished initialising itself after a cold boot
+	 */
+	case TSP_ENTRY_DONE:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * Stash the SP entry points information. This is done
+		 * only once on the primary cpu
+		 */
+		assert(tsp_vectors == NULL);
+		tsp_vectors = (tsp_vectors_t *) x1;
+
+		if (tsp_vectors) {
+			set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_ON);
+
+			/*
+			 * TSP has been successfully initialized. Register power
+			 * management hooks with PSCI
+			 */
+			psci_register_spd_pm_hook(&tspd_pm);
+
+			/*
+			 * Register an interrupt handler for S-EL1 interrupts
+			 * when generated during code executing in the
+			 * non-secure state.
+			 */
+			flags = 0;
+			set_interrupt_rm_flag(flags, NON_SECURE);
+			rc = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+						tspd_sel1_interrupt_handler,
+						flags);
+			if (rc)
+				panic();
+
+#if TSP_NS_INTR_ASYNC_PREEMPT
+			/*
+			 * Register an interrupt handler for NS interrupts when
+			 * generated during code executing in secure state are
+			 * routed to EL3.
+			 */
+			flags = 0;
+			set_interrupt_rm_flag(flags, SECURE);
+
+			rc = register_interrupt_type_handler(INTR_TYPE_NS,
+						tspd_ns_interrupt_handler,
+						flags);
+			if (rc)
+				panic();
+
+			/*
+			 * Disable the NS interrupt locally.
+			 */
+			disable_intr_rm_local(INTR_TYPE_NS, SECURE);
+#endif
+		}
+
+
+#if TSP_INIT_ASYNC
+		/* Save the Secure EL1 system register context */
+		assert(cm_get_context(SECURE) == &tsp_ctx->cpu_ctx);
+		cm_el1_sysregs_context_save(SECURE);
+
+		/* Program EL3 registers to enable entry into the next EL */
+		next_image_info = bl31_plat_get_next_image_ep_info(NON_SECURE);
+		assert(next_image_info);
+		assert(NON_SECURE ==
+				GET_SECURITY_STATE(next_image_info->h.attr));
+
+		cm_init_my_context(next_image_info);
+		cm_prepare_el3_exit(NON_SECURE);
+		SMC_RET0(cm_get_context(NON_SECURE));
+#else
+		/*
+		 * SP reports completion. The SPD must have initiated
+		 * the original request through a synchronous entry
+		 * into the SP. Jump back to the original C runtime
+		 * context.
+		 */
+		tspd_synchronous_sp_exit(tsp_ctx, x1);
+		break;
+#endif
+	/*
+	 * This function ID is used only by the SP to indicate it has finished
+	 * aborting a preempted Yielding SMC Call.
+	 */
+	case TSP_ABORT_DONE:
+
+	/*
+	 * These function IDs are used only by the SP to indicate it has
+	 * finished:
+	 * 1. turning itself on in response to an earlier psci
+	 *    cpu_on request
+	 * 2. resuming itself after an earlier psci cpu_suspend
+	 *    request.
+	 */
+	case TSP_ON_DONE:
+	case TSP_RESUME_DONE:
+
+	/*
+	 * These function IDs are used only by the SP to indicate it has
+	 * finished:
+	 * 1. suspending itself after an earlier psci cpu_suspend
+	 *    request.
+	 * 2. turning itself off in response to an earlier psci
+	 *    cpu_off request.
+	 */
+	case TSP_OFF_DONE:
+	case TSP_SUSPEND_DONE:
+	case TSP_SYSTEM_OFF_DONE:
+	case TSP_SYSTEM_RESET_DONE:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		/*
+		 * SP reports completion. The SPD must have initiated the
+		 * original request through a synchronous entry into the SP.
+		 * Jump back to the original C runtime context, and pass x1 as
+		 * return value to the caller
+		 */
+		tspd_synchronous_sp_exit(tsp_ctx, x1);
+		break;
+
+		/*
+		 * Request from non-secure client to perform an
+		 * arithmetic operation or response from secure
+		 * payload to an earlier request.
+		 */
+	case TSP_FAST_FID(TSP_ADD):
+	case TSP_FAST_FID(TSP_SUB):
+	case TSP_FAST_FID(TSP_MUL):
+	case TSP_FAST_FID(TSP_DIV):
+
+	case TSP_YIELD_FID(TSP_ADD):
+	case TSP_YIELD_FID(TSP_SUB):
+	case TSP_YIELD_FID(TSP_MUL):
+	case TSP_YIELD_FID(TSP_DIV):
+		/*
+		 * Request from non-secure client to perform a check
+		 * of the DIT PSTATE bit.
+		 */
+	case TSP_YIELD_FID(TSP_CHECK_DIT):
+		if (ns) {
+			/*
+			 * This is a fresh request from the non-secure client.
+			 * The parameters are in x1 and x2. Figure out which
+			 * registers need to be preserved, save the non-secure
+			 * state and send the request to the secure payload.
+			 */
+			assert(handle == cm_get_context(NON_SECURE));
+
+			/* Check if we are already preempted */
+			if (get_yield_smc_active_flag(tsp_ctx->state))
+				SMC_RET1(handle, SMC_UNK);
+
+			cm_el1_sysregs_context_save(NON_SECURE);
+
+			/* Save x1 and x2 for use by TSP_GET_ARGS call below */
+			store_tsp_args(tsp_ctx, x1, x2);
+
+			/*
+			 * We are done stashing the non-secure context. Ask the
+			 * secure payload to do the work now.
+			 */
+
+			/*
+			 * Verify if there is a valid context to use, copy the
+			 * operation type and parameters to the secure context
+			 * and jump to the fast smc entry point in the secure
+			 * payload. Entry into S-EL1 will take place upon exit
+			 * from this function.
+			 */
+			assert(&tsp_ctx->cpu_ctx == cm_get_context(SECURE));
+
+			/* Set appropriate entry for SMC.
+			 * We expect the TSP to manage the PSTATE.I and PSTATE.F
+			 * flags as appropriate.
+			 */
+			if (GET_SMC_TYPE(smc_fid) == SMC_TYPE_FAST) {
+				cm_set_elr_el3(SECURE, (uint64_t)
+						&tsp_vectors->fast_smc_entry);
+			} else {
+				set_yield_smc_active_flag(tsp_ctx->state);
+				cm_set_elr_el3(SECURE, (uint64_t)
+						&tsp_vectors->yield_smc_entry);
+#if TSP_NS_INTR_ASYNC_PREEMPT
+				/*
+				 * Enable the routing of NS interrupts to EL3
+				 * during processing of a Yielding SMC Call on
+				 * this core.
+				 */
+				enable_intr_rm_local(INTR_TYPE_NS, SECURE);
+#endif
+
+#if EL3_EXCEPTION_HANDLING
+				/*
+				 * With EL3 exception handling, while an SMC is
+				 * being processed, Non-secure interrupts can't
+				 * preempt Secure execution. However, for
+				 * yielding SMCs, we want preemption to happen;
+				 * so explicitly allow NS preemption in this
+				 * case, and supply the preemption return code
+				 * for TSP.
+				 */
+				ehf_allow_ns_preemption(TSP_PREEMPTED);
+#endif
+			}
+
+			cm_el1_sysregs_context_restore(SECURE);
+			cm_set_next_eret_context(SECURE);
+			SMC_RET3(&tsp_ctx->cpu_ctx, smc_fid, x1, x2);
+		} else {
+			/*
+			 * This is the result from the secure client of an
+			 * earlier request. The results are in x1-x3. Copy it
+			 * into the non-secure context, save the secure state
+			 * and return to the non-secure state.
+			 */
+			assert(handle == cm_get_context(SECURE));
+			cm_el1_sysregs_context_save(SECURE);
+
+			/* Get a reference to the non-secure context */
+			ns_cpu_context = cm_get_context(NON_SECURE);
+			assert(ns_cpu_context);
+
+			/* Restore non-secure state */
+			cm_el1_sysregs_context_restore(NON_SECURE);
+			cm_set_next_eret_context(NON_SECURE);
+			if (GET_SMC_TYPE(smc_fid) == SMC_TYPE_YIELD) {
+				clr_yield_smc_active_flag(tsp_ctx->state);
+#if TSP_NS_INTR_ASYNC_PREEMPT
+				/*
+				 * Disable the routing of NS interrupts to EL3
+				 * after processing of a Yielding SMC Call on
+				 * this core is finished.
+				 */
+				disable_intr_rm_local(INTR_TYPE_NS, SECURE);
+#endif
+			}
+
+			SMC_RET3(ns_cpu_context, x1, x2, x3);
+		}
+		assert(0); /* Unreachable */
+
+	/*
+	 * Request from the non-secure world to abort a preempted Yielding SMC
+	 * Call.
+	 */
+	case TSP_FID_ABORT:
+		/* ABORT should only be invoked by normal world */
+		if (!ns) {
+			assert(0);
+			break;
+		}
+
+		assert(handle == cm_get_context(NON_SECURE));
+		cm_el1_sysregs_context_save(NON_SECURE);
+
+		/* Abort the preempted SMC request */
+		if (!tspd_abort_preempted_smc(tsp_ctx)) {
+			/*
+			 * If there was no preempted SMC to abort, return
+			 * SMC_UNK.
+			 *
+			 * Restoring the NON_SECURE context is not necessary as
+			 * the synchronous entry did not take place if the
+			 * return code of tspd_abort_preempted_smc is zero.
+			 */
+			cm_set_next_eret_context(NON_SECURE);
+			break;
+		}
+
+		cm_el1_sysregs_context_restore(NON_SECURE);
+		cm_set_next_eret_context(NON_SECURE);
+		SMC_RET1(handle, SMC_OK);
+
+		/*
+		 * Request from non secure world to resume the preempted
+		 * Yielding SMC Call.
+		 */
+	case TSP_FID_RESUME:
+		/* RESUME should be invoked only by normal world */
+		if (!ns) {
+			assert(0);
+			break;
+		}
+
+		/*
+		 * This is a resume request from the non-secure client.
+		 * save the non-secure state and send the request to
+		 * the secure payload.
+		 */
+		assert(handle == cm_get_context(NON_SECURE));
+
+		/* Check if we are already preempted before resume */
+		if (!get_yield_smc_active_flag(tsp_ctx->state))
+			SMC_RET1(handle, SMC_UNK);
+
+		cm_el1_sysregs_context_save(NON_SECURE);
+
+		/*
+		 * We are done stashing the non-secure context. Ask the
+		 * secure payload to do the work now.
+		 */
+#if TSP_NS_INTR_ASYNC_PREEMPT
+		/*
+		 * Enable the routing of NS interrupts to EL3 during resumption
+		 * of a Yielding SMC Call on this core.
+		 */
+		enable_intr_rm_local(INTR_TYPE_NS, SECURE);
+#endif
+
+#if EL3_EXCEPTION_HANDLING
+		/*
+		 * Allow the resumed yielding SMC processing to be preempted by
+		 * Non-secure interrupts. Also, supply the preemption return
+		 * code for TSP.
+		 */
+		ehf_allow_ns_preemption(TSP_PREEMPTED);
+#endif
+
+		/* We just need to return to the preempted point in
+		 * TSP and the execution will resume as normal.
+		 */
+		cm_el1_sysregs_context_restore(SECURE);
+		cm_set_next_eret_context(SECURE);
+		SMC_RET0(&tsp_ctx->cpu_ctx);
+
+		/*
+		 * This is a request from the secure payload for more arguments
+		 * for an ongoing arithmetic operation requested by the
+		 * non-secure world. Simply return the arguments from the non-
+		 * secure client in the original call.
+		 */
+	case TSP_GET_ARGS:
+		if (ns)
+			SMC_RET1(handle, SMC_UNK);
+
+		get_tsp_args(tsp_ctx, x1, x2);
+		SMC_RET2(handle, x1, x2);
+
+	case TOS_CALL_COUNT:
+		/*
+		 * Return the number of service function IDs implemented to
+		 * provide service to non-secure
+		 */
+		SMC_RET1(handle, TSP_NUM_FID);
+
+	case TOS_UID:
+		/* Return TSP UID to the caller */
+		SMC_UUID_RET(handle, tsp_uuid);
+
+	case TOS_CALL_VERSION:
+		/* Return the version of current implementation */
+		SMC_RET2(handle, TSP_VERSION_MAJOR, TSP_VERSION_MINOR);
+
+	default:
+		break;
+	}
+
+	SMC_RET1(handle, SMC_UNK);
+}
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	tspd_fast,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_FAST,
+	tspd_setup,
+	tspd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for Yielding SMC Calls */
+DECLARE_RT_SVC(
+	tspd_std,
+
+	OEN_TOS_START,
+	OEN_TOS_END,
+	SMC_TYPE_YIELD,
+	NULL,
+	tspd_smc_handler
+);
diff --git a/services/spd/tspd/tspd_pm.c b/services/spd/tspd/tspd_pm.c
new file mode 100644
index 0000000..b95ee8f
--- /dev/null
+++ b/services/spd/tspd/tspd_pm.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <bl32/tsp/tsp.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+
+#include "tspd_private.h"
+
+/*******************************************************************************
+ * The target cpu is being turned on. Allow the TSPD/TSP to perform any actions
+ * needed. Nothing at the moment.
+ ******************************************************************************/
+static void tspd_cpu_on_handler(u_register_t target_cpu)
+{
+}
+
+/*******************************************************************************
+ * This cpu is being turned off. Allow the TSPD/TSP to perform any actions
+ * needed
+ ******************************************************************************/
+static int32_t tspd_cpu_off_handler(u_register_t unused)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/*
+	 * Abort any preempted SMC request before overwriting the SECURE
+	 * context.
+	 */
+	tspd_abort_preempted_smc(tsp_ctx);
+
+	/* Program the entry point and enter the TSP */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_off_entry);
+	rc = tspd_synchronous_sp_entry(tsp_ctx);
+
+	/*
+	 * Read the response from the TSP. A non-zero return means that
+	 * something went wrong while communicating with the TSP.
+	 */
+	if (rc != 0)
+		panic();
+
+	/*
+	 * Reset TSP's context for a fresh start when this cpu is turned on
+	 * subsequently.
+	 */
+	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_OFF);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This cpu is being suspended. S-EL1 state must have been saved in the
+ * resident cpu (mpidr format) if it is a UP/UP migratable TSP.
+ ******************************************************************************/
+static void tspd_cpu_suspend_handler(u_register_t max_off_pwrlvl)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/*
+	 * Abort any preempted SMC request before overwriting the SECURE
+	 * context.
+	 */
+	tspd_abort_preempted_smc(tsp_ctx);
+
+	/* Program the entry point and enter the TSP */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_suspend_entry);
+	rc = tspd_synchronous_sp_entry(tsp_ctx);
+
+	/*
+	 * Read the response from the TSP. A non-zero return means that
+	 * something went wrong while communicating with the TSP.
+	 */
+	if (rc)
+		panic();
+
+	/* Update its context to reflect the state the TSP is in */
+	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_SUSPEND);
+}
+
+/*******************************************************************************
+ * This cpu has been turned on. Enter the TSP to initialise S-EL1 and other bits
+ * before passing control back to the Secure Monitor. Entry in S-EL1 is done
+ * after initialising minimal architectural state that guarantees safe
+ * execution.
+ ******************************************************************************/
+static void tspd_cpu_on_finish_handler(u_register_t unused)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+	entry_point_info_t tsp_on_entrypoint;
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_OFF);
+
+	tspd_init_tsp_ep_state(&tsp_on_entrypoint,
+				TSP_AARCH64,
+				(uint64_t) &tsp_vectors->cpu_on_entry,
+				tsp_ctx);
+
+	/* Initialise this cpu's secure context */
+	cm_init_my_context(&tsp_on_entrypoint);
+
+#if TSP_NS_INTR_ASYNC_PREEMPT
+	/*
+	 * Disable the NS interrupt locally since it will be enabled globally
+	 * within cm_init_my_context.
+	 */
+	disable_intr_rm_local(INTR_TYPE_NS, SECURE);
+#endif
+
+	/* Enter the TSP */
+	rc = tspd_synchronous_sp_entry(tsp_ctx);
+
+	/*
+	 * Read the response from the TSP. A non-zero return means that
+	 * something went wrong while communicating with the SP.
+	 */
+	if (rc != 0)
+		panic();
+
+	/* Update its context to reflect the state the SP is in */
+	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_ON);
+}
+
+/*******************************************************************************
+ * This cpu has resumed from suspend. The SPD saved the TSP context when it
+ * completed the preceding suspend call. Use that context to program an entry
+ * into the TSP to allow it to do any remaining book keeping
+ ******************************************************************************/
+static void tspd_cpu_suspend_finish_handler(u_register_t max_off_pwrlvl)
+{
+	int32_t rc = 0;
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_SUSPEND);
+
+	/* Program the entry point, max_off_pwrlvl and enter the SP */
+	write_ctx_reg(get_gpregs_ctx(&tsp_ctx->cpu_ctx),
+		      CTX_GPREG_X0,
+		      max_off_pwrlvl);
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->cpu_resume_entry);
+	rc = tspd_synchronous_sp_entry(tsp_ctx);
+
+	/*
+	 * Read the response from the TSP. A non-zero return means that
+	 * something went wrong while communicating with the TSP.
+	 */
+	if (rc != 0)
+		panic();
+
+	/* Update its context to reflect the state the SP is in */
+	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_ON);
+}
+
+/*******************************************************************************
+ * Return the type of TSP the TSPD is dealing with. Report the current resident
+ * cpu (mpidr format) if it is a UP/UP migratable TSP.
+ ******************************************************************************/
+static int32_t tspd_cpu_migrate_info(u_register_t *resident_cpu)
+{
+	return TSP_MIGRATE_INFO;
+}
+
+/*******************************************************************************
+ * System is about to be switched off. Allow the TSPD/TSP to perform
+ * any actions needed.
+ ******************************************************************************/
+static void tspd_system_off(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/*
+	 * Abort any preempted SMC request before overwriting the SECURE
+	 * context.
+	 */
+	tspd_abort_preempted_smc(tsp_ctx);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->system_off_entry);
+
+	/* Enter the TSP. We do not care about the return value because we
+	 * must continue the shutdown anyway */
+	tspd_synchronous_sp_entry(tsp_ctx);
+}
+
+/*******************************************************************************
+ * System is about to be reset. Allow the TSPD/TSP to perform
+ * any actions needed.
+ ******************************************************************************/
+static void tspd_system_reset(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/*
+	 * Abort any preempted SMC request before overwriting the SECURE
+	 * context.
+	 */
+	tspd_abort_preempted_smc(tsp_ctx);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->system_reset_entry);
+
+	/*
+	 * Enter the TSP. We do not care about the return value because we
+	 * must continue the reset anyway
+	 */
+	tspd_synchronous_sp_entry(tsp_ctx);
+}
+
+/*******************************************************************************
+ * Structure populated by the TSP Dispatcher to be given a chance to perform any
+ * TSP bookkeeping before PSCI executes a power mgmt.  operation.
+ ******************************************************************************/
+const spd_pm_ops_t tspd_pm = {
+	.svc_on = tspd_cpu_on_handler,
+	.svc_off = tspd_cpu_off_handler,
+	.svc_suspend = tspd_cpu_suspend_handler,
+	.svc_on_finish = tspd_cpu_on_finish_handler,
+	.svc_suspend_finish = tspd_cpu_suspend_finish_handler,
+	.svc_migrate = NULL,
+	.svc_migrate_info = tspd_cpu_migrate_info,
+	.svc_system_off = tspd_system_off,
+	.svc_system_reset = tspd_system_reset
+};
diff --git a/services/spd/tspd/tspd_private.h b/services/spd/tspd/tspd_private.h
new file mode 100644
index 0000000..d6c03c9
--- /dev/null
+++ b/services/spd/tspd/tspd_private.h
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef TSPD_PRIVATE_H
+#define TSPD_PRIVATE_H
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <bl31/interrupt_mgmt.h>
+#include <context.h>
+#include <lib/psci/psci.h>
+
+/*******************************************************************************
+ * Secure Payload PM state information e.g. SP is suspended, uninitialised etc
+ * and macros to access the state information in the per-cpu 'state' flags
+ ******************************************************************************/
+#define TSP_PSTATE_OFF		0
+#define TSP_PSTATE_ON		1
+#define TSP_PSTATE_SUSPEND	2
+#define TSP_PSTATE_SHIFT	0
+#define TSP_PSTATE_MASK	0x3
+#define get_tsp_pstate(state)	((state >> TSP_PSTATE_SHIFT) & TSP_PSTATE_MASK)
+#define clr_tsp_pstate(state)	(state &= ~(TSP_PSTATE_MASK \
+					    << TSP_PSTATE_SHIFT))
+#define set_tsp_pstate(st, pst)	do {					       \
+					clr_tsp_pstate(st);		       \
+					st |= (pst & TSP_PSTATE_MASK) <<       \
+						TSP_PSTATE_SHIFT;	       \
+				} while (0);
+
+
+/*
+ * This flag is used by the TSPD to determine if the TSP is servicing a yielding
+ * SMC request prior to programming the next entry into the TSP e.g. if TSP
+ * execution is preempted by a non-secure interrupt and handed control to the
+ * normal world. If another request which is distinct from what the TSP was
+ * previously doing arrives, then this flag will be help the TSPD to either
+ * reject the new request or service it while ensuring that the previous context
+ * is not corrupted.
+ */
+#define YIELD_SMC_ACTIVE_FLAG_SHIFT	2
+#define YIELD_SMC_ACTIVE_FLAG_MASK	1
+#define get_yield_smc_active_flag(state)				\
+				((state >> YIELD_SMC_ACTIVE_FLAG_SHIFT) \
+				& YIELD_SMC_ACTIVE_FLAG_MASK)
+#define set_yield_smc_active_flag(state)	(state |=		\
+					1 << YIELD_SMC_ACTIVE_FLAG_SHIFT)
+#define clr_yield_smc_active_flag(state)	(state &=		\
+					~(YIELD_SMC_ACTIVE_FLAG_MASK	\
+					<< YIELD_SMC_ACTIVE_FLAG_SHIFT))
+
+/*******************************************************************************
+ * Secure Payload execution state information i.e. aarch32 or aarch64
+ ******************************************************************************/
+#define TSP_AARCH32		MODE_RW_32
+#define TSP_AARCH64		MODE_RW_64
+
+/*******************************************************************************
+ * The SPD should know the type of Secure Payload.
+ ******************************************************************************/
+#define TSP_TYPE_UP		PSCI_TOS_NOT_UP_MIG_CAP
+#define TSP_TYPE_UPM		PSCI_TOS_UP_MIG_CAP
+#define TSP_TYPE_MP		PSCI_TOS_NOT_PRESENT_MP
+
+/*******************************************************************************
+ * Secure Payload migrate type information as known to the SPD. We assume that
+ * the SPD is dealing with an MP Secure Payload.
+ ******************************************************************************/
+#define TSP_MIGRATE_INFO		TSP_TYPE_MP
+
+/*******************************************************************************
+ * Number of cpus that the present on this platform. TODO: Rely on a topology
+ * tree to determine this in the future to avoid assumptions about mpidr
+ * allocation
+ ******************************************************************************/
+#define TSPD_CORE_COUNT		PLATFORM_CORE_COUNT
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define TSPD_C_RT_CTX_X19		0x0
+#define TSPD_C_RT_CTX_X20		0x8
+#define TSPD_C_RT_CTX_X21		0x10
+#define TSPD_C_RT_CTX_X22		0x18
+#define TSPD_C_RT_CTX_X23		0x20
+#define TSPD_C_RT_CTX_X24		0x28
+#define TSPD_C_RT_CTX_X25		0x30
+#define TSPD_C_RT_CTX_X26		0x38
+#define TSPD_C_RT_CTX_X27		0x40
+#define TSPD_C_RT_CTX_X28		0x48
+#define TSPD_C_RT_CTX_X29		0x50
+#define TSPD_C_RT_CTX_X30		0x58
+#define TSPD_C_RT_CTX_SIZE		0x60
+#define TSPD_C_RT_CTX_ENTRIES		(TSPD_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve caller-saved registers of the
+ * SP context while performing a TSP preemption.
+ * Note: These offsets have to match with the offsets for the corresponding
+ * registers in cpu_context as we are using memcpy to copy the values from
+ * cpu_context to sp_ctx.
+ ******************************************************************************/
+#define TSPD_SP_CTX_X0		0x0
+#define TSPD_SP_CTX_X1		0x8
+#define TSPD_SP_CTX_X2		0x10
+#define TSPD_SP_CTX_X3		0x18
+#define TSPD_SP_CTX_X4		0x20
+#define TSPD_SP_CTX_X5		0x28
+#define TSPD_SP_CTX_X6		0x30
+#define TSPD_SP_CTX_X7		0x38
+#define TSPD_SP_CTX_X8		0x40
+#define TSPD_SP_CTX_X9		0x48
+#define TSPD_SP_CTX_X10		0x50
+#define TSPD_SP_CTX_X11		0x58
+#define TSPD_SP_CTX_X12		0x60
+#define TSPD_SP_CTX_X13		0x68
+#define TSPD_SP_CTX_X14		0x70
+#define TSPD_SP_CTX_X15		0x78
+#define TSPD_SP_CTX_X16		0x80
+#define TSPD_SP_CTX_X17		0x88
+#define TSPD_SP_CTX_SIZE	0x90
+#define TSPD_SP_CTX_ENTRIES		(TSPD_SP_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#include <lib/cassert.h>
+
+/*
+ * The number of arguments to save during a SMC call for TSP.
+ * Currently only x1 and x2 are used by TSP.
+ */
+#define TSP_NUM_ARGS	0x2
+
+/* AArch64 callee saved general purpose register context structure. */
+DEFINE_REG_STRUCT(c_rt_regs, TSPD_C_RT_CTX_ENTRIES);
+
+/*
+ * Compile time assertion to ensure that both the compiler and linker
+ * have the same double word aligned view of the size of the C runtime
+ * register context.
+ */
+CASSERT(TSPD_C_RT_CTX_SIZE == sizeof(c_rt_regs_t),	\
+	assert_spd_c_rt_regs_size_mismatch);
+
+/* SEL1 Secure payload (SP) caller saved register context structure. */
+DEFINE_REG_STRUCT(sp_ctx_regs, TSPD_SP_CTX_ENTRIES);
+
+/*
+ * Compile time assertion to ensure that both the compiler and linker
+ * have the same double word aligned view of the size of the C runtime
+ * register context.
+ */
+CASSERT(TSPD_SP_CTX_SIZE == sizeof(sp_ctx_regs_t),	\
+	assert_spd_sp_regs_size_mismatch);
+
+/*******************************************************************************
+ * Structure which helps the SPD to maintain the per-cpu state of the SP.
+ * 'saved_spsr_el3' - temporary copy to allow S-EL1 interrupt handling when
+ *                    the TSP has been preempted.
+ * 'saved_elr_el3'  - temporary copy to allow S-EL1 interrupt handling when
+ *                    the TSP has been preempted.
+ * 'state'          - collection of flags to track SP state e.g. on/off
+ * 'mpidr'          - mpidr to associate a context with a cpu
+ * 'c_rt_ctx'       - stack address to restore C runtime context from after
+ *                    returning from a synchronous entry into the SP.
+ * 'cpu_ctx'        - space to maintain SP architectural state
+ * 'saved_tsp_args' - space to store arguments for TSP arithmetic operations
+ *                    which will queried using the TSP_GET_ARGS SMC by TSP.
+ * 'sp_ctx'         - space to save the SEL1 Secure Payload(SP) caller saved
+ *                    register context after it has been preempted by an EL3
+ *                    routed NS interrupt and when a Secure Interrupt is taken
+ *                    to SP.
+ ******************************************************************************/
+typedef struct tsp_context {
+	uint64_t saved_elr_el3;
+	uint32_t saved_spsr_el3;
+	uint32_t state;
+	uint64_t mpidr;
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+	uint64_t saved_tsp_args[TSP_NUM_ARGS];
+#if TSP_NS_INTR_ASYNC_PREEMPT
+	sp_ctx_regs_t sp_ctx;
+	bool preempted_by_sel1_intr;
+#endif
+} tsp_context_t;
+
+/* Helper macros to store and retrieve tsp args from tsp_context */
+#define store_tsp_args(_tsp_ctx, _x1, _x2)		do {\
+				_tsp_ctx->saved_tsp_args[0] = _x1;\
+				_tsp_ctx->saved_tsp_args[1] = _x2;\
+			} while (0)
+
+#define get_tsp_args(_tsp_ctx, _x1, _x2)	do {\
+				_x1 = _tsp_ctx->saved_tsp_args[0];\
+				_x2 = _tsp_ctx->saved_tsp_args[1];\
+			} while (0)
+
+/* TSPD power management handlers */
+extern const spd_pm_ops_t tspd_pm;
+
+/*******************************************************************************
+ * Forward declarations
+ ******************************************************************************/
+typedef struct tsp_vectors tsp_vectors_t;
+
+/*******************************************************************************
+ * Function & Data prototypes
+ ******************************************************************************/
+uint64_t tspd_enter_sp(uint64_t *c_rt_ctx);
+void __dead2 tspd_exit_sp(uint64_t c_rt_ctx, uint64_t ret);
+uint64_t tspd_synchronous_sp_entry(tsp_context_t *tsp_ctx);
+void __dead2 tspd_synchronous_sp_exit(tsp_context_t *tsp_ctx, uint64_t ret);
+void tspd_init_tsp_ep_state(struct entry_point_info *tsp_entry_point,
+				uint32_t rw,
+				uint64_t pc,
+				tsp_context_t *tsp_ctx);
+int tspd_abort_preempted_smc(tsp_context_t *tsp_ctx);
+
+uint64_t tspd_handle_sp_preemption(void *handle);
+
+extern tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
+extern tsp_vectors_t *tsp_vectors;
+#endif /*__ASSEMBLER__*/
+
+#endif /* TSPD_PRIVATE_H */
diff --git a/services/std_svc/drtm/drtm_dma_prot.c b/services/std_svc/drtm/drtm_dma_prot.c
new file mode 100644
index 0000000..48317fd
--- /dev/null
+++ b/services/std_svc/drtm/drtm_dma_prot.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM DMA protection.
+ *
+ * Authors:
+ *      Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ *
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include <common/debug.h>
+#include <drivers/arm/smmu_v3.h>
+#include "drtm_dma_prot.h"
+#include "drtm_main.h"
+#include "drtm_remediation.h"
+#include <plat/common/platform.h>
+#include <smccc_helpers.h>
+
+/*
+ *  ________________________  LAUNCH success        ________________________
+ * |        Initial         | -------------------> |      Prot engaged      |
+ * |````````````````````````|                      |````````````````````````|
+ * |  request.type == NONE  |                      |  request.type != NONE  |
+ * |                        | <------------------- |                        |
+ * `________________________'        UNPROTECT_MEM `________________________'
+ *
+ * Transitions that are not shown correspond to ABI calls that do not change
+ * state and result in an error being returned to the caller.
+ */
+static struct dma_prot active_prot = {
+	.type = PROTECT_NONE,
+};
+
+/* Version-independent type. */
+typedef struct drtm_dl_dma_prot_args_v1 struct_drtm_dl_dma_prot_args;
+
+/*
+ * This function checks that platform supports complete DMA protection.
+ * and returns false - if the platform supports complete DMA protection.
+ * and returns true - if the platform does not support complete DMA protection.
+ */
+bool drtm_dma_prot_init(void)
+{
+	bool must_init_fail = false;
+	const uintptr_t *smmus;
+	size_t num_smmus = 0;
+	unsigned int total_smmus;
+
+	/* Warns presence of non-host platforms */
+	if (plat_has_non_host_platforms()) {
+		WARN("DRTM: the platform includes trusted DMA-capable devices"
+				" (non-host platforms)\n");
+	}
+
+	/*
+	 * DLME protection is uncertain on platforms with peripherals whose
+	 * DMA is not managed by an SMMU. DRTM doesn't work on such platforms.
+	 */
+	if (plat_has_unmanaged_dma_peripherals()) {
+		ERROR("DRTM: this platform does not provide DMA protection\n");
+		must_init_fail = true;
+	}
+
+	/*
+	 * Check that the platform reported all SMMUs.
+	 * It is acceptable if the platform doesn't have any SMMUs when it
+	 * doesn't have any DMA-capable devices.
+	 */
+	total_smmus = plat_get_total_smmus();
+	plat_enumerate_smmus(&smmus, &num_smmus);
+	if (num_smmus != total_smmus) {
+		ERROR("DRTM: could not discover all SMMUs\n");
+		must_init_fail = true;
+	}
+
+	return must_init_fail;
+}
+
+/*
+ * Checks that the DMA protection arguments are valid and that the given
+ * protected regions are covered by DMA protection.
+ */
+enum drtm_retc drtm_dma_prot_check_args(const struct_drtm_dl_dma_prot_args *a,
+					int a_dma_prot_type,
+					drtm_mem_region_t p)
+{
+	switch ((enum dma_prot_type)a_dma_prot_type) {
+	case PROTECT_MEM_ALL:
+		if (a->dma_prot_table_paddr || a->dma_prot_table_size) {
+			ERROR("DRTM: invalid launch due to inconsistent"
+			      " DMA protection arguments\n");
+			return MEM_PROTECT_INVALID;
+		}
+		/*
+		 * Full DMA protection ought to ensure that the DLME and NWd
+		 * DCE regions are protected, no further checks required.
+		 */
+		return SUCCESS;
+
+	default:
+		ERROR("DRTM: invalid launch due to unsupported DMA protection type\n");
+		return MEM_PROTECT_INVALID;
+	}
+}
+
+enum drtm_retc drtm_dma_prot_engage(const struct_drtm_dl_dma_prot_args *a,
+				    int a_dma_prot_type)
+{
+	const uintptr_t *smmus;
+	size_t num_smmus = 0;
+
+	if (active_prot.type != PROTECT_NONE) {
+		ERROR("DRTM: launch denied as previous DMA protection"
+		      " is still engaged\n");
+		return DENIED;
+	}
+
+	if (a_dma_prot_type == PROTECT_NONE) {
+		return SUCCESS;
+		/* Only PROTECT_MEM_ALL is supported currently. */
+	} else if (a_dma_prot_type != PROTECT_MEM_ALL) {
+		ERROR("%s(): unimplemented DMA protection type\n", __func__);
+		panic();
+	}
+
+	/*
+	 * Engage SMMUs in accordance with the request we have previously received.
+	 * Only PROTECT_MEM_ALL is implemented currently.
+	 */
+	plat_enumerate_smmus(&smmus, &num_smmus);
+	for (const uintptr_t *smmu = smmus; smmu < smmus+num_smmus; smmu++) {
+		/*
+		 * TODO: Invalidate SMMU's Stage-1 and Stage-2 TLB entries.  This ensures
+		 * that any outstanding device transactions are completed, see Section
+		 * 3.21.1, specification IHI_0070_C_a for an approximate reference.
+		 */
+		int rc = smmuv3_ns_set_abort_all(*smmu);
+		if (rc != 0) {
+			ERROR("DRTM: SMMU at PA 0x%lx failed to engage DMA protection"
+			      " rc=%d\n", *smmu, rc);
+			return INTERNAL_ERROR;
+		}
+	}
+
+	/*
+	 * TODO: Restrict DMA from the GIC.
+	 *
+	 * Full DMA protection may be achieved as follows:
+	 *
+	 * With a GICv3:
+	 * - Set GICR_CTLR.EnableLPIs to 0, for each GICR;
+	 *   GICR_CTLR.RWP == 0 must be the case before finishing, for each GICR.
+	 * - Set GITS_CTLR.Enabled to 0;
+	 *   GITS_CTLR.Quiescent == 1 must be the case before finishing.
+	 *
+	 * In addition, with a GICv4:
+	 * - Set GICR_VPENDBASER.Valid to 0, for each GICR;
+	 *   GICR_CTLR.RWP == 0 must be the case before finishing, for each GICR.
+	 *
+	 * Alternatively, e.g. if some bit values cannot be changed at runtime,
+	 * this procedure should return an error if the LPI Pending and
+	 * Configuration tables overlap the regions being protected.
+	 */
+
+	active_prot.type = a_dma_prot_type;
+
+	return SUCCESS;
+}
+
+/*
+ * Undo what has previously been done in drtm_dma_prot_engage(), or enter
+ * remediation if it is not possible.
+ */
+enum drtm_retc drtm_dma_prot_disengage(void)
+{
+	const uintptr_t *smmus;
+	size_t num_smmus = 0;
+	const char *err_str = "cannot undo PROTECT_MEM_ALL SMMU config";
+
+	if (active_prot.type == PROTECT_NONE) {
+		return SUCCESS;
+		/* Only PROTECT_MEM_ALL is supported currently. */
+	} else if (active_prot.type != PROTECT_MEM_ALL) {
+		ERROR("%s(): unimplemented DMA protection type\n", __func__);
+		panic();
+	}
+
+	/*
+	 * For PROTECT_MEM_ALL, undo the SMMU configuration for "abort all" mode
+	 * done during engage().
+	 */
+	/* Simply enter remediation for now. */
+	(void)smmus;
+	(void)num_smmus;
+	drtm_enter_remediation(1ULL, err_str);
+
+	/* TODO: Undo GIC DMA restrictions. */
+
+	active_prot.type = PROTECT_NONE;
+
+	return SUCCESS;
+}
+
+uint64_t drtm_unprotect_mem(void *ctx)
+{
+	enum drtm_retc ret;
+
+	switch (active_prot.type) {
+	case PROTECT_NONE:
+		ERROR("DRTM: invalid UNPROTECT_MEM, no DMA protection has"
+		      " previously been engaged\n");
+		ret = DENIED;
+		break;
+
+	case PROTECT_MEM_ALL:
+		/*
+		 * UNPROTECT_MEM is a no-op for PROTECT_MEM_ALL:  DRTM must not touch
+		 * the NS SMMU as it is expected that the DLME has configured it.
+		 */
+		active_prot.type = PROTECT_NONE;
+
+		ret = SUCCESS;
+		break;
+
+	default:
+		ret = drtm_dma_prot_disengage();
+		break;
+	}
+
+	SMC_RET1(ctx, ret);
+}
+
+void drtm_dma_prot_serialise_table(uint8_t *dst, size_t *size_out)
+{
+	if (active_prot.type == PROTECT_NONE) {
+		return;
+	} else if (active_prot.type != PROTECT_MEM_ALL) {
+		ERROR("%s(): unimplemented DMA protection type\n", __func__);
+		panic();
+	}
+
+	struct __packed descr_table_1 {
+		drtm_memory_region_descriptor_table_t header;
+		drtm_mem_region_t regions[1];
+	} prot_table = {
+		.header = {
+			.revision = 1,
+			.num_regions = sizeof(((struct descr_table_1 *)NULL)->regions) /
+				sizeof(((struct descr_table_1 *)NULL)->regions[0])
+		},
+		.regions = {
+			{.region_address = 0, PAGES_AND_TYPE(UINT64_MAX, 0x3)},
+		}
+	};
+
+	memcpy(dst, &prot_table, sizeof(prot_table));
+	*size_out = sizeof(prot_table);
+}
diff --git a/services/std_svc/drtm/drtm_dma_prot.h b/services/std_svc/drtm/drtm_dma_prot.h
new file mode 100644
index 0000000..79dc9cb
--- /dev/null
+++ b/services/std_svc/drtm/drtm_dma_prot.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_DMA_PROT_H
+#define DRTM_DMA_PROT_H
+
+#include <stdint.h>
+#include <plat/common/platform.h>
+#include <services/drtm_svc.h>
+
+struct __packed drtm_dl_dma_prot_args_v1 {
+	uint64_t dma_prot_table_paddr;
+	uint64_t dma_prot_table_size;
+};
+
+/* Values for DRTM_PROTECT_MEMORY */
+enum dma_prot_type {
+	PROTECT_NONE    = -1,
+	PROTECT_MEM_ALL = 0,
+	PROTECT_MEM_REGION = 2,
+};
+
+struct dma_prot {
+	enum dma_prot_type type;
+};
+
+#define DRTM_MEM_REGION_PAGES_AND_TYPE(pages, type) \
+	(((uint64_t)(pages) & (((uint64_t)1 << 52) - 1)) \
+	 | (((uint64_t)(type) & 0x7) << 52))
+
+#define PAGES_AND_TYPE(pages, type) \
+		.region_size_type = DRTM_MEM_REGION_PAGES_AND_TYPE(pages, type)
+
+/* Opaque / encapsulated type. */
+typedef struct drtm_dl_dma_prot_args_v1 drtm_dl_dma_prot_args_v1_t;
+
+bool drtm_dma_prot_init(void);
+enum drtm_retc drtm_dma_prot_check_args(const drtm_dl_dma_prot_args_v1_t *a,
+					int a_dma_prot_type,
+					drtm_mem_region_t p);
+enum drtm_retc drtm_dma_prot_engage(const drtm_dl_dma_prot_args_v1_t *a,
+				    int a_dma_prot_type);
+enum drtm_retc drtm_dma_prot_disengage(void);
+uint64_t drtm_unprotect_mem(void *ctx);
+void drtm_dma_prot_serialise_table(uint8_t *dst, size_t *size_out);
+
+#endif /* DRTM_DMA_PROT_H */
diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c
new file mode 100644
index 0000000..3acf683
--- /dev/null
+++ b/services/std_svc/drtm/drtm_main.c
@@ -0,0 +1,839 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM service
+ *
+ * Authors:
+ *	Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ *	Brian Nezvadovitz <brinez@microsoft.com> 2021-02-01
+ */
+
+#include <stdint.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <drivers/auth/crypto_mod.h>
+#include "drtm_main.h"
+#include "drtm_measurements.h"
+#include "drtm_remediation.h"
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/psci/psci_lib.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/platform.h>
+#include <services/drtm_svc.h>
+#include <services/sdei.h>
+#include <platform_def.h>
+
+/* Structure to store DRTM features specific to the platform. */
+static drtm_features_t plat_drtm_features;
+
+/* DRTM-formatted memory map. */
+static drtm_memory_region_descriptor_table_t *plat_drtm_mem_map;
+
+/* DLME header */
+struct_dlme_data_header dlme_data_hdr_init;
+
+/* Minimum data memory requirement */
+uint64_t dlme_data_min_size;
+
+int drtm_setup(void)
+{
+	bool rc;
+	const plat_drtm_tpm_features_t *plat_tpm_feat;
+	const plat_drtm_dma_prot_features_t *plat_dma_prot_feat;
+
+	INFO("DRTM service setup\n");
+
+	/* Read boot PE ID from MPIDR */
+	plat_drtm_features.boot_pe_id = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+	rc = drtm_dma_prot_init();
+	if (rc) {
+		return INTERNAL_ERROR;
+	}
+
+	/*
+	 * initialise the platform supported crypto module that will
+	 * be used by the DRTM-service to calculate hash of DRTM-
+	 * implementation specific components
+	 */
+	crypto_mod_init();
+
+	/* Build DRTM-compatible address map. */
+	plat_drtm_mem_map = drtm_build_address_map();
+	if (plat_drtm_mem_map == NULL) {
+		return INTERNAL_ERROR;
+	}
+
+	/* Get DRTM features from platform hooks. */
+	plat_tpm_feat = plat_drtm_get_tpm_features();
+	if (plat_tpm_feat == NULL) {
+		return INTERNAL_ERROR;
+	}
+
+	plat_dma_prot_feat = plat_drtm_get_dma_prot_features();
+	if (plat_dma_prot_feat == NULL) {
+		return INTERNAL_ERROR;
+	}
+
+	/*
+	 * Add up minimum DLME data memory.
+	 *
+	 * For systems with complete DMA protection there is only one entry in
+	 * the protected regions table.
+	 */
+	if (plat_dma_prot_feat->dma_protection_support ==
+			ARM_DRTM_DMA_PROT_FEATURES_DMA_SUPPORT_COMPLETE) {
+		dlme_data_min_size =
+			sizeof(drtm_memory_region_descriptor_table_t) +
+			sizeof(drtm_mem_region_t);
+		dlme_data_hdr_init.dlme_prot_regions_size = dlme_data_min_size;
+	} else {
+		/*
+		 * TODO set protected regions table size based on platform DMA
+		 * protection configuration
+		 */
+		panic();
+	}
+
+	dlme_data_hdr_init.dlme_addr_map_size = drtm_get_address_map_size();
+	dlme_data_hdr_init.dlme_tcb_hashes_table_size =
+				plat_drtm_get_tcb_hash_table_size();
+	dlme_data_hdr_init.dlme_impdef_region_size =
+				plat_drtm_get_imp_def_dlme_region_size();
+
+	dlme_data_min_size += dlme_data_hdr_init.dlme_addr_map_size +
+			      PLAT_DRTM_EVENT_LOG_MAX_SIZE +
+			      dlme_data_hdr_init.dlme_tcb_hashes_table_size +
+			      dlme_data_hdr_init.dlme_impdef_region_size;
+
+	dlme_data_min_size = page_align(dlme_data_min_size, UP)/PAGE_SIZE;
+
+	/* Fill out platform DRTM features structure */
+	/* Only support default PCR schema (0x1) in this implementation. */
+	ARM_DRTM_TPM_FEATURES_SET_PCR_SCHEMA(plat_drtm_features.tpm_features,
+		ARM_DRTM_TPM_FEATURES_PCR_SCHEMA_DEFAULT);
+	ARM_DRTM_TPM_FEATURES_SET_TPM_HASH(plat_drtm_features.tpm_features,
+		plat_tpm_feat->tpm_based_hash_support);
+	ARM_DRTM_TPM_FEATURES_SET_FW_HASH(plat_drtm_features.tpm_features,
+		plat_tpm_feat->firmware_hash_algorithm);
+	ARM_DRTM_MIN_MEM_REQ_SET_MIN_DLME_DATA_SIZE(plat_drtm_features.minimum_memory_requirement,
+		dlme_data_min_size);
+	ARM_DRTM_MIN_MEM_REQ_SET_DCE_SIZE(plat_drtm_features.minimum_memory_requirement,
+		plat_drtm_get_min_size_normal_world_dce());
+	ARM_DRTM_DMA_PROT_FEATURES_SET_MAX_REGIONS(plat_drtm_features.dma_prot_features,
+		plat_dma_prot_feat->max_num_mem_prot_regions);
+	ARM_DRTM_DMA_PROT_FEATURES_SET_DMA_SUPPORT(plat_drtm_features.dma_prot_features,
+		plat_dma_prot_feat->dma_protection_support);
+	ARM_DRTM_TCB_HASH_FEATURES_SET_MAX_NUM_HASHES(plat_drtm_features.tcb_hash_features,
+		plat_drtm_get_tcb_hash_features());
+
+	return 0;
+}
+
+static inline void invalidate_icache_all(void)
+{
+	__asm__ volatile("ic      ialluis");
+	dsb();
+	isb();
+}
+
+static inline uint64_t drtm_features_tpm(void *ctx)
+{
+	SMC_RET2(ctx, 1ULL, /* TPM feature is supported */
+		 plat_drtm_features.tpm_features);
+}
+
+static inline uint64_t drtm_features_mem_req(void *ctx)
+{
+	SMC_RET2(ctx, 1ULL, /* memory req Feature is supported */
+		 plat_drtm_features.minimum_memory_requirement);
+}
+
+static inline uint64_t drtm_features_boot_pe_id(void *ctx)
+{
+	SMC_RET2(ctx, 1ULL, /* Boot PE feature is supported */
+		 plat_drtm_features.boot_pe_id);
+}
+
+static inline uint64_t drtm_features_dma_prot(void *ctx)
+{
+	SMC_RET2(ctx, 1ULL, /* DMA protection feature is supported */
+		 plat_drtm_features.dma_prot_features);
+}
+
+static inline uint64_t drtm_features_tcb_hashes(void *ctx)
+{
+	SMC_RET2(ctx, 1ULL, /* TCB hash feature is supported */
+		 plat_drtm_features.tcb_hash_features);
+}
+
+static enum drtm_retc drtm_dl_check_caller_el(void *ctx)
+{
+	uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3);
+	uint64_t dl_caller_el;
+	uint64_t dl_caller_aarch;
+
+	dl_caller_el = spsr_el3 >> MODE_EL_SHIFT & MODE_EL_MASK;
+	dl_caller_aarch = spsr_el3 >> MODE_RW_SHIFT & MODE_RW_MASK;
+
+	/* Caller's security state is checked from drtm_smc_handle function */
+
+	/* Caller can be NS-EL2/EL1 */
+	if (dl_caller_el == MODE_EL3) {
+		ERROR("DRTM: invalid launch from EL3\n");
+		return DENIED;
+	}
+
+	if (dl_caller_aarch != MODE_RW_64) {
+		ERROR("DRTM: invalid launch from non-AArch64 execution state\n");
+		return DENIED;
+	}
+
+	return SUCCESS;
+}
+
+static enum drtm_retc drtm_dl_check_cores(void)
+{
+	bool running_on_single_core;
+	uint64_t this_pe_aff_value = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+	if (this_pe_aff_value != plat_drtm_features.boot_pe_id) {
+		ERROR("DRTM: invalid launch on a non-boot PE\n");
+		return DENIED;
+	}
+
+	running_on_single_core = psci_is_last_on_cpu_safe();
+	if (!running_on_single_core) {
+		ERROR("DRTM: invalid launch due to non-boot PE not being turned off\n");
+		return DENIED;
+	}
+
+	return SUCCESS;
+}
+
+static enum drtm_retc drtm_dl_prepare_dlme_data(const struct_drtm_dl_args *args)
+{
+	int rc;
+	uint64_t dlme_data_paddr;
+	size_t dlme_data_max_size;
+	uintptr_t dlme_data_mapping;
+	struct_dlme_data_header *dlme_data_hdr;
+	uint8_t *dlme_data_cursor;
+	size_t dlme_data_mapping_bytes;
+	size_t serialised_bytes_actual;
+
+	dlme_data_paddr = args->dlme_paddr + args->dlme_data_off;
+	dlme_data_max_size = args->dlme_size - args->dlme_data_off;
+
+	/*
+	 * The capacity of the given DLME data region is checked when
+	 * the other dynamic launch arguments are.
+	 */
+	if (dlme_data_max_size < dlme_data_min_size) {
+		ERROR("%s: assertion failed:"
+		      " dlme_data_max_size (%ld) < dlme_data_total_bytes_req (%ld)\n",
+		      __func__, dlme_data_max_size, dlme_data_min_size);
+		panic();
+	}
+
+	/* Map the DLME data region as NS memory. */
+	dlme_data_mapping_bytes = ALIGNED_UP(dlme_data_max_size, DRTM_PAGE_SIZE);
+	rc = mmap_add_dynamic_region_alloc_va(dlme_data_paddr,
+					      &dlme_data_mapping,
+					      dlme_data_mapping_bytes,
+					      MT_RW_DATA | MT_NS |
+					      MT_SHAREABILITY_ISH);
+	if (rc != 0) {
+		WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n",
+		     __func__, rc);
+		return INTERNAL_ERROR;
+	}
+	dlme_data_hdr = (struct_dlme_data_header *)dlme_data_mapping;
+	dlme_data_cursor = (uint8_t *)dlme_data_hdr + sizeof(*dlme_data_hdr);
+
+	memcpy(dlme_data_hdr, (const void *)&dlme_data_hdr_init,
+	       sizeof(*dlme_data_hdr));
+
+	/* Set the header version and size. */
+	dlme_data_hdr->version = 1;
+	dlme_data_hdr->this_hdr_size = sizeof(*dlme_data_hdr);
+
+	/* Prepare DLME protected regions. */
+	drtm_dma_prot_serialise_table(dlme_data_cursor,
+				      &serialised_bytes_actual);
+	assert(serialised_bytes_actual ==
+	       dlme_data_hdr->dlme_prot_regions_size);
+	dlme_data_cursor += serialised_bytes_actual;
+
+	/* Prepare DLME address map. */
+	if (plat_drtm_mem_map != NULL) {
+		memcpy(dlme_data_cursor, plat_drtm_mem_map,
+		       dlme_data_hdr->dlme_addr_map_size);
+	} else {
+		WARN("DRTM: DLME address map is not in the cache\n");
+	}
+	dlme_data_cursor += dlme_data_hdr->dlme_addr_map_size;
+
+	/* Prepare DRTM event log for DLME. */
+	drtm_serialise_event_log(dlme_data_cursor, &serialised_bytes_actual);
+	assert(serialised_bytes_actual <= PLAT_DRTM_EVENT_LOG_MAX_SIZE);
+	dlme_data_hdr->dlme_tpm_log_size = serialised_bytes_actual;
+	dlme_data_cursor += serialised_bytes_actual;
+
+	/*
+	 * TODO: Prepare the TCB hashes for DLME, currently its size
+	 * 0
+	 */
+	dlme_data_cursor += dlme_data_hdr->dlme_tcb_hashes_table_size;
+
+	/* Implementation-specific region size is unused. */
+	dlme_data_cursor += dlme_data_hdr->dlme_impdef_region_size;
+
+	/*
+	 * Prepare DLME data size, includes all data region referenced above
+	 * alongwith the DLME data header
+	 */
+	dlme_data_hdr->dlme_data_size = dlme_data_cursor - (uint8_t *)dlme_data_hdr;
+
+	/* Unmap the DLME data region. */
+	rc = mmap_remove_dynamic_region(dlme_data_mapping, dlme_data_mapping_bytes);
+	if (rc != 0) {
+		ERROR("%s(): mmap_remove_dynamic_region() failed"
+		      " unexpectedly rc=%d\n", __func__, rc);
+		panic();
+	}
+
+	return SUCCESS;
+}
+
+/*
+ * Note: accesses to the dynamic launch args, and to the DLME data are
+ * little-endian as required, thanks to TF-A BL31 init requirements.
+ */
+static enum drtm_retc drtm_dl_check_args(uint64_t x1,
+					 struct_drtm_dl_args *a_out)
+{
+	uint64_t dlme_start, dlme_end;
+	uint64_t dlme_img_start, dlme_img_ep, dlme_img_end;
+	uint64_t dlme_data_start, dlme_data_end;
+	uintptr_t va_mapping;
+	size_t va_mapping_size;
+	struct_drtm_dl_args *a;
+	struct_drtm_dl_args args_buf;
+	int rc;
+
+	if (x1 % DRTM_PAGE_SIZE != 0) {
+		ERROR("DRTM: parameters structure is not "
+		      DRTM_PAGE_SIZE_STR "-aligned\n");
+		return INVALID_PARAMETERS;
+	}
+
+	va_mapping_size = ALIGNED_UP(sizeof(struct_drtm_dl_args), DRTM_PAGE_SIZE);
+
+	/* check DRTM parameters are within NS address region */
+	rc = plat_drtm_validate_ns_region(x1, va_mapping_size);
+	if (rc != 0) {
+		ERROR("DRTM: parameters lies within secure memory\n");
+		return INVALID_PARAMETERS;
+	}
+
+	rc = mmap_add_dynamic_region_alloc_va(x1, &va_mapping, va_mapping_size,
+					      MT_MEMORY | MT_NS | MT_RO |
+					      MT_SHAREABILITY_ISH);
+	if (rc != 0) {
+		WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n",
+		      __func__, rc);
+		return INTERNAL_ERROR;
+	}
+	a = (struct_drtm_dl_args *)va_mapping;
+
+	/* Sanitize cache of data passed in args by the DCE Preamble. */
+	flush_dcache_range(va_mapping, va_mapping_size);
+
+	args_buf = *a;
+
+	rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size);
+	if (rc) {
+		ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly"
+		      " rc=%d\n", __func__, rc);
+		panic();
+	}
+	a = &args_buf;
+
+	if (!((a->version >= ARM_DRTM_PARAMS_MIN_VERSION) &&
+	    (a->version <= ARM_DRTM_PARAMS_MAX_VERSION))) {
+		ERROR("DRTM: parameters structure version %u is unsupported\n",
+		      a->version);
+		return NOT_SUPPORTED;
+	}
+
+	if (!(a->dlme_img_off < a->dlme_size &&
+	      a->dlme_data_off < a->dlme_size)) {
+		ERROR("DRTM: argument offset is outside of the DLME region\n");
+		return INVALID_PARAMETERS;
+	}
+	dlme_start = a->dlme_paddr;
+	dlme_end = a->dlme_paddr + a->dlme_size;
+	dlme_img_start = a->dlme_paddr + a->dlme_img_off;
+	dlme_img_ep = dlme_img_start + a->dlme_img_ep_off;
+	dlme_img_end = dlme_img_start + a->dlme_img_size;
+	dlme_data_start = a->dlme_paddr + a->dlme_data_off;
+	dlme_data_end = dlme_end;
+
+	/* Check the DLME regions arguments. */
+	if ((dlme_start % DRTM_PAGE_SIZE) != 0) {
+		ERROR("DRTM: argument DLME region is not "
+		      DRTM_PAGE_SIZE_STR "-aligned\n");
+		return INVALID_PARAMETERS;
+	}
+
+	if (!(dlme_start < dlme_end &&
+	      dlme_start <= dlme_img_start && dlme_img_start < dlme_img_end &&
+	      dlme_start <= dlme_data_start && dlme_data_start < dlme_data_end)) {
+		ERROR("DRTM: argument DLME region is discontiguous\n");
+		return INVALID_PARAMETERS;
+	}
+
+	if (dlme_img_start < dlme_data_end && dlme_data_start < dlme_img_end) {
+		ERROR("DRTM: argument DLME regions overlap\n");
+		return INVALID_PARAMETERS;
+	}
+
+	/* Check the DLME image region arguments. */
+	if ((dlme_img_start % DRTM_PAGE_SIZE) != 0) {
+		ERROR("DRTM: argument DLME image region is not "
+		      DRTM_PAGE_SIZE_STR "-aligned\n");
+		return INVALID_PARAMETERS;
+	}
+
+	if (!(dlme_img_start <= dlme_img_ep && dlme_img_ep < dlme_img_end)) {
+		ERROR("DRTM: DLME entry point is outside of the DLME image region\n");
+		return INVALID_PARAMETERS;
+	}
+
+	if ((dlme_img_ep % 4) != 0) {
+		ERROR("DRTM: DLME image entry point is not 4-byte-aligned\n");
+		return INVALID_PARAMETERS;
+	}
+
+	/* Check the DLME data region arguments. */
+	if ((dlme_data_start % DRTM_PAGE_SIZE) != 0) {
+		ERROR("DRTM: argument DLME data region is not "
+		      DRTM_PAGE_SIZE_STR "-aligned\n");
+		return INVALID_PARAMETERS;
+	}
+
+	if (dlme_data_end - dlme_data_start < dlme_data_min_size) {
+		ERROR("DRTM: argument DLME data region is short of %lu bytes\n",
+		      dlme_data_min_size - (size_t)(dlme_data_end - dlme_data_start));
+		return INVALID_PARAMETERS;
+	}
+
+	/* check DLME region (paddr + size) is within a NS address region */
+	rc = plat_drtm_validate_ns_region(dlme_start, (size_t)a->dlme_size);
+	if (rc != 0) {
+		ERROR("DRTM: DLME region lies within secure memory\n");
+		return INVALID_PARAMETERS;
+	}
+
+	/* Check the Normal World DCE region arguments. */
+	if (a->dce_nwd_paddr != 0) {
+		uint32_t dce_nwd_start = a->dce_nwd_paddr;
+		uint32_t dce_nwd_end = dce_nwd_start + a->dce_nwd_size;
+
+		if (!(dce_nwd_start < dce_nwd_end)) {
+			ERROR("DRTM: argument Normal World DCE region is dicontiguous\n");
+			return INVALID_PARAMETERS;
+		}
+
+		if (dce_nwd_start < dlme_end && dlme_start < dce_nwd_end) {
+			ERROR("DRTM: argument Normal World DCE regions overlap\n");
+			return INVALID_PARAMETERS;
+		}
+	}
+
+	/*
+	 * Map and sanitize the cache of data range passed by DCE Preamble. This
+	 * is required to avoid / defend against racing with cache evictions
+	 */
+	va_mapping_size = ALIGNED_UP((dlme_end - dlme_start), DRTM_PAGE_SIZE);
+	rc = mmap_add_dynamic_region_alloc_va(dlme_img_start, &va_mapping, va_mapping_size,
+					      MT_MEMORY | MT_NS | MT_RO |
+					      MT_SHAREABILITY_ISH);
+	if (rc != 0) {
+		ERROR("DRTM: %s: mmap_add_dynamic_region_alloc_va() failed rc=%d\n",
+		      __func__, rc);
+		return INTERNAL_ERROR;
+	}
+	flush_dcache_range(va_mapping, va_mapping_size);
+
+	rc = mmap_remove_dynamic_region(va_mapping, va_mapping_size);
+	if (rc) {
+		ERROR("%s(): mmap_remove_dynamic_region() failed unexpectedly"
+		      " rc=%d\n", __func__, rc);
+		panic();
+	}
+
+	*a_out = *a;
+	return SUCCESS;
+}
+
+static void drtm_dl_reset_dlme_el_state(enum drtm_dlme_el dlme_el)
+{
+	uint64_t sctlr;
+
+	/*
+	 * TODO: Set PE state according to the PSCI's specification of the initial
+	 * state after CPU_ON, or to reset values if unspecified, where they exist,
+	 * or define sensible values otherwise.
+	 */
+
+	switch (dlme_el) {
+	case DLME_AT_EL1:
+		sctlr = read_sctlr_el1();
+		break;
+
+	case DLME_AT_EL2:
+		sctlr = read_sctlr_el2();
+		break;
+
+	default: /* Not reached */
+		ERROR("%s(): dlme_el has the unexpected value %d\n",
+		      __func__, dlme_el);
+		panic();
+	}
+
+	sctlr &= ~(/* Disable DLME's EL MMU, since the existing page-tables are untrusted. */
+		   SCTLR_M_BIT
+		   | SCTLR_EE_BIT               /* Little-endian data accesses. */
+		  );
+
+	sctlr |= SCTLR_C_BIT | SCTLR_I_BIT; /* Allow instruction and data caching. */
+
+	switch (dlme_el) {
+	case DLME_AT_EL1:
+		write_sctlr_el1(sctlr);
+		break;
+
+	case DLME_AT_EL2:
+		write_sctlr_el2(sctlr);
+		break;
+	}
+}
+
+static void drtm_dl_reset_dlme_context(enum drtm_dlme_el dlme_el)
+{
+	void *ns_ctx = cm_get_context(NON_SECURE);
+	gp_regs_t *gpregs = get_gpregs_ctx(ns_ctx);
+	uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3);
+
+	/* Reset all gpregs, including SP_EL0. */
+	memset(gpregs, 0, sizeof(*gpregs));
+
+	/* Reset SP_ELx. */
+	switch (dlme_el) {
+	case DLME_AT_EL1:
+		write_sp_el1(0);
+		break;
+
+	case DLME_AT_EL2:
+		write_sp_el2(0);
+		break;
+	}
+
+	/*
+	 * DLME's async exceptions are masked to avoid a NWd attacker's timed
+	 * interference with any state we established trust in or measured.
+	 */
+	spsr_el3 |= SPSR_DAIF_MASK << SPSR_DAIF_SHIFT;
+
+	write_ctx_reg(get_el3state_ctx(ns_ctx), CTX_SPSR_EL3, spsr_el3);
+}
+
+static void drtm_dl_prepare_eret_to_dlme(const struct_drtm_dl_args *args, enum drtm_dlme_el dlme_el)
+{
+	void *ctx = cm_get_context(NON_SECURE);
+	uint64_t dlme_ep = DL_ARGS_GET_DLME_ENTRY_POINT(args);
+	uint64_t spsr_el3 = read_ctx_reg(get_el3state_ctx(ctx), CTX_SPSR_EL3);
+
+	/* Next ERET is to the DLME's EL. */
+	spsr_el3 &= ~(MODE_EL_MASK << MODE_EL_SHIFT);
+	switch (dlme_el) {
+	case DLME_AT_EL1:
+		spsr_el3 |= MODE_EL1 << MODE_EL_SHIFT;
+		break;
+
+	case DLME_AT_EL2:
+		spsr_el3 |= MODE_EL2 << MODE_EL_SHIFT;
+		break;
+	}
+
+	/* Next ERET is to the DLME entry point. */
+	cm_set_elr_spsr_el3(NON_SECURE, dlme_ep, spsr_el3);
+}
+
+static uint64_t drtm_dynamic_launch(uint64_t x1, void *handle)
+{
+	enum drtm_retc ret = SUCCESS;
+	enum drtm_retc dma_prot_ret;
+	struct_drtm_dl_args args;
+	/* DLME should be highest NS exception level */
+	enum drtm_dlme_el dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1;
+
+	/* Ensure that only boot PE is powered on */
+	ret = drtm_dl_check_cores();
+	if (ret != SUCCESS) {
+		SMC_RET1(handle, ret);
+	}
+
+	/*
+	 * Ensure that execution state is AArch64 and the caller
+	 * is highest non-secure exception level
+	 */
+	ret = drtm_dl_check_caller_el(handle);
+	if (ret != SUCCESS) {
+		SMC_RET1(handle, ret);
+	}
+
+	ret = drtm_dl_check_args(x1, &args);
+	if (ret != SUCCESS) {
+		SMC_RET1(handle, ret);
+	}
+
+	/* Ensure that there are no SDEI event registered */
+#if SDEI_SUPPORT
+	if (sdei_get_registered_event_count() != 0) {
+		SMC_RET1(handle, DENIED);
+	}
+#endif /* SDEI_SUPPORT */
+
+	/*
+	 * Engage the DMA protections.  The launch cannot proceed without the DMA
+	 * protections due to potential TOC/TOU vulnerabilities w.r.t. the DLME
+	 * region (and to the NWd DCE region).
+	 */
+	ret = drtm_dma_prot_engage(&args.dma_prot_args,
+				   DL_ARGS_GET_DMA_PROT_TYPE(&args));
+	if (ret != SUCCESS) {
+		SMC_RET1(handle, ret);
+	}
+
+	/*
+	 * The DMA protection is now engaged.  Note that any failure mode that
+	 * returns an error to the DRTM-launch caller must now disengage DMA
+	 * protections before returning to the caller.
+	 */
+
+	ret = drtm_take_measurements(&args);
+	if (ret != SUCCESS) {
+		goto err_undo_dma_prot;
+	}
+
+	ret = drtm_dl_prepare_dlme_data(&args);
+	if (ret != SUCCESS) {
+		goto err_undo_dma_prot;
+	}
+
+	/*
+	 * Note that, at the time of writing, the DRTM spec allows a successful
+	 * launch from NS-EL1 to return to a DLME in NS-EL2.  The practical risk
+	 * of a privilege escalation, e.g. due to a compromised hypervisor, is
+	 * considered small enough not to warrant the specification of additional
+	 * DRTM conduits that would be necessary to maintain OSs' abstraction from
+	 * the presence of EL2 were the dynamic launch only be allowed from the
+	 * highest NS EL.
+	 */
+
+	dlme_el = (el_implemented(2) != EL_IMPL_NONE) ? MODE_EL2 : MODE_EL1;
+
+	drtm_dl_reset_dlme_el_state(dlme_el);
+	drtm_dl_reset_dlme_context(dlme_el);
+
+	drtm_dl_prepare_eret_to_dlme(&args, dlme_el);
+
+	/*
+	 * As per DRTM beta0 spec table #28 invalidate the instruction cache
+	 * before jumping to the DLME. This is required to defend against
+	 * potentially-malicious cache contents.
+	 */
+	invalidate_icache_all();
+
+	/* Return the DLME region's address in x0, and the DLME data offset in x1.*/
+	SMC_RET2(handle, args.dlme_paddr, args.dlme_data_off);
+
+err_undo_dma_prot:
+	dma_prot_ret = drtm_dma_prot_disengage();
+	if (dma_prot_ret != SUCCESS) {
+		ERROR("%s(): drtm_dma_prot_disengage() failed unexpectedly"
+		      " rc=%d\n", __func__, ret);
+		panic();
+	}
+
+	SMC_RET1(handle, ret);
+}
+
+uint64_t drtm_smc_handler(uint32_t smc_fid,
+			  uint64_t x1,
+			  uint64_t x2,
+			  uint64_t x3,
+			  uint64_t x4,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	/* Check that the SMC call is from the Normal World. */
+	if (!is_caller_non_secure(flags)) {
+		SMC_RET1(handle, NOT_SUPPORTED);
+	}
+
+	switch (smc_fid) {
+	case ARM_DRTM_SVC_VERSION:
+		INFO("DRTM service handler: version\n");
+		/* Return the version of current implementation */
+		SMC_RET1(handle, ARM_DRTM_VERSION);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_FEATURES:
+		if (((x1 >> ARM_DRTM_FUNC_SHIFT) & ARM_DRTM_FUNC_MASK) ==
+		    ARM_DRTM_FUNC_ID) {
+			/* Dispatch function-based queries. */
+			switch (x1 & FUNCID_MASK) {
+			case ARM_DRTM_SVC_VERSION:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_FEATURES:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_UNPROTECT_MEM:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_CLOSE_LOCALITY:
+				WARN("ARM_DRTM_SVC_CLOSE_LOCALITY feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_GET_ERROR:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_SET_ERROR:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_SET_TCB_HASH:
+				WARN("ARM_DRTM_SVC_TCB_HASH feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_LOCK_TCB_HASH:
+				WARN("ARM_DRTM_SVC_LOCK_TCB_HASH feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			default:
+				ERROR("Unknown DRTM service function\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+			}
+		} else {
+			/* Dispatch feature-based queries. */
+			switch (x1 & ARM_DRTM_FEAT_ID_MASK) {
+			case ARM_DRTM_FEATURES_TPM:
+				INFO("++ DRTM service handler: TPM features\n");
+				return drtm_features_tpm(handle);
+				break;	/* not reached */
+
+			case ARM_DRTM_FEATURES_MEM_REQ:
+				INFO("++ DRTM service handler: Min. mem."
+				     " requirement features\n");
+				return drtm_features_mem_req(handle);
+				break;	/* not reached */
+
+			case ARM_DRTM_FEATURES_DMA_PROT:
+				INFO("++ DRTM service handler: "
+				     "DMA protection features\n");
+				return drtm_features_dma_prot(handle);
+				break;	/* not reached */
+
+			case ARM_DRTM_FEATURES_BOOT_PE_ID:
+				INFO("++ DRTM service handler: "
+				     "Boot PE ID features\n");
+				return drtm_features_boot_pe_id(handle);
+				break;	/* not reached */
+
+			case ARM_DRTM_FEATURES_TCB_HASHES:
+				INFO("++ DRTM service handler: "
+				     "TCB-hashes features\n");
+				return drtm_features_tcb_hashes(handle);
+				break;	/* not reached */
+
+			default:
+				ERROR("Unknown ARM DRTM service feature\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+			}
+		}
+
+	case ARM_DRTM_SVC_UNPROTECT_MEM:
+		INFO("DRTM service handler: unprotect mem\n");
+		return drtm_unprotect_mem(handle);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+		INFO("DRTM service handler: dynamic launch\n");
+		return drtm_dynamic_launch(x1, handle);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_CLOSE_LOCALITY:
+		WARN("DRTM service handler: close locality %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_GET_ERROR:
+		INFO("DRTM service handler: get error\n");
+		drtm_get_error(handle);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_SET_ERROR:
+		INFO("DRTM service handler: set error\n");
+		drtm_set_error(x1, handle);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_SET_TCB_HASH:
+		WARN("DRTM service handler: set TCB hash %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;  /* not reached */
+
+	case ARM_DRTM_SVC_LOCK_TCB_HASH:
+		WARN("DRTM service handler: lock TCB hash %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;  /* not reached */
+
+	default:
+		ERROR("Unknown DRTM service function: 0x%x\n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+		break;	/* not reached */
+	}
+
+	/* not reached */
+	SMC_RET1(handle, SMC_UNK);
+}
diff --git a/services/std_svc/drtm/drtm_main.h b/services/std_svc/drtm/drtm_main.h
new file mode 100644
index 0000000..6005163
--- /dev/null
+++ b/services/std_svc/drtm/drtm_main.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_MAIN_H
+#define DRTM_MAIN_H
+
+#include <stdint.h>
+
+#include <assert.h>
+#include <lib/smccc.h>
+
+#include "drtm_dma_prot.h"
+
+#define ALIGNED_UP(x, a) __extension__ ({ \
+	__typeof__(a) _a = (a); \
+	__typeof__(a) _one = 1; \
+	assert(IS_POWER_OF_TWO(_a)); \
+	((x) + (_a - _one)) & ~(_a - _one); \
+})
+
+#define ALIGNED_DOWN(x, a) __extension__ ({ \
+	__typeof__(a) _a = (a); \
+	__typeof__(a) _one = 1; \
+	assert(IS_POWER_OF_TWO(_a)); \
+	(x) & ~(_a - _one); \
+})
+
+#define DRTM_PAGE_SIZE		(4 * (1 << 10))
+#define DRTM_PAGE_SIZE_STR	"4-KiB"
+
+#define DL_ARGS_GET_DMA_PROT_TYPE(a)    (((a)->features >> 3) & 0x7U)
+#define DL_ARGS_GET_PCR_SCHEMA(a)	(((a)->features >> 1) & 0x3U)
+#define DL_ARGS_GET_DLME_ENTRY_POINT(a)	\
+		(((a)->dlme_paddr + (a)->dlme_img_off + (a)->dlme_img_ep_off))
+
+/*
+ * Range(Min/Max) of DRTM parameter structure versions supported
+ */
+#define ARM_DRTM_PARAMS_MIN_VERSION	U(1)
+#define ARM_DRTM_PARAMS_MAX_VERSION	U(1)
+
+enum drtm_dlme_el {
+	DLME_AT_EL1 = MODE_EL1,
+	DLME_AT_EL2 = MODE_EL2
+};
+
+enum drtm_retc {
+	SUCCESS = SMC_OK,
+	NOT_SUPPORTED = SMC_UNK,
+	INVALID_PARAMETERS = -2,
+	DENIED = -3,
+	NOT_FOUND = -4,
+	INTERNAL_ERROR = -5,
+	MEM_PROTECT_INVALID = -6,
+};
+
+typedef struct {
+	uint64_t tpm_features;
+	uint64_t minimum_memory_requirement;
+	uint64_t dma_prot_features;
+	uint64_t boot_pe_id;
+	uint64_t tcb_hash_features;
+} drtm_features_t;
+
+struct __packed drtm_dl_args_v1 {
+	uint16_t version;	/* Must be 1. */
+	uint8_t __res[2];
+	uint32_t features;
+	uint64_t dlme_paddr;
+	uint64_t dlme_size;
+	uint64_t dlme_img_off;
+	uint64_t dlme_img_ep_off;
+	uint64_t dlme_img_size;
+	uint64_t dlme_data_off;
+	uint64_t dce_nwd_paddr;
+	uint64_t dce_nwd_size;
+	drtm_dl_dma_prot_args_v1_t dma_prot_args;
+} __aligned(__alignof(uint16_t /* First member's type, `uint16_t version' */));
+
+struct __packed dlme_data_header_v1 {
+	uint16_t version;	/* Must be 1. */
+	uint16_t this_hdr_size;
+	uint8_t __res[4];
+	uint64_t dlme_data_size;
+	uint64_t dlme_prot_regions_size;
+	uint64_t dlme_addr_map_size;
+	uint64_t dlme_tpm_log_size;
+	uint64_t dlme_tcb_hashes_table_size;
+	uint64_t dlme_impdef_region_size;
+} __aligned(__alignof(uint16_t /* First member's type, `uint16_t version'. */));
+
+typedef struct dlme_data_header_v1 struct_dlme_data_header;
+
+drtm_memory_region_descriptor_table_t *drtm_build_address_map(void);
+uint64_t drtm_get_address_map_size(void);
+
+/*
+ * Version-independent type.  May be used to avoid excessive line of code
+ * changes when migrating to new struct versions.
+ */
+typedef struct drtm_dl_args_v1 struct_drtm_dl_args;
+
+#endif /* DRTM_MAIN_H */
diff --git a/services/std_svc/drtm/drtm_measurements.c b/services/std_svc/drtm/drtm_measurements.c
new file mode 100644
index 0000000..a8f2b32
--- /dev/null
+++ b/services/std_svc/drtm/drtm_measurements.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM measurements into TPM PCRs.
+ *
+ * Authors:
+ *      Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ *
+ */
+#include <assert.h>
+
+#include <common/debug.h>
+#include <drivers/auth/crypto_mod.h>
+#include <drivers/measured_boot/event_log/event_log.h>
+#include "drtm_main.h"
+#include "drtm_measurements.h"
+#include <lib/xlat_tables/xlat_tables_v2.h>
+
+/* Event Log buffer */
+static uint8_t drtm_event_log[PLAT_DRTM_EVENT_LOG_MAX_SIZE];
+
+/*
+ * Calculate and write hash of various payloads as per DRTM specification
+ * to Event Log.
+ *
+ * @param[in] data_base         Address of data
+ * @param[in] data_size         Size of data
+ * @param[in] event_type        Type of Event
+ * @param[in] event_name        Name of the Event
+ * @return:
+ *      0 = success
+ *    < 0 = error
+ */
+static int drtm_event_log_measure_and_record(uintptr_t data_base,
+					     uint32_t data_size,
+					     uint32_t event_type,
+					     const char *event_name,
+					     unsigned int pcr)
+{
+	int rc;
+	unsigned char hash_data[CRYPTO_MD_MAX_SIZE];
+	event_log_metadata_t metadata = {0};
+
+	metadata.name = event_name;
+	metadata.pcr = pcr;
+
+	/*
+	 * Measure the payloads requested by D-CRTM and DCE commponents
+	 * Hash algorithm decided by the Event Log driver at build-time
+	 */
+	rc = event_log_measure(data_base, data_size, hash_data);
+	if (rc != 0) {
+		return rc;
+	}
+
+	/* Record the mesasurement in the EventLog buffer */
+	event_log_record(hash_data, event_type, &metadata);
+
+	return 0;
+}
+
+/*
+ * Initialise Event Log global variables, used during the recording
+ * of various payload measurements into the Event Log buffer
+ *
+ * @param[in] event_log_start           Base address of Event Log buffer
+ * @param[in] event_log_finish          End address of Event Log buffer,
+ *                                      it is a first byte past end of the
+ *                                      buffer
+ */
+static void drtm_event_log_init(uint8_t *event_log_start,
+				uint8_t *event_log_finish)
+{
+	event_log_buf_init(event_log_start, event_log_finish);
+	event_log_write_specid_event();
+}
+
+enum drtm_retc drtm_take_measurements(const struct_drtm_dl_args *a)
+{
+	int rc;
+	uintptr_t dlme_img_mapping;
+	uint64_t dlme_img_ep;
+	size_t dlme_img_mapping_bytes;
+	uint8_t drtm_null_data = 0U;
+	uint8_t pcr_schema = DL_ARGS_GET_PCR_SCHEMA(a);
+	const char *drtm_event_arm_sep_data = "ARM_DRTM";
+
+	/* Initialise the EventLog driver */
+	drtm_event_log_init(drtm_event_log, drtm_event_log +
+			    sizeof(drtm_event_log));
+
+	/**
+	 * Measurements extended into PCR-17.
+	 *
+	 * PCR-17: Measure the DCE image.  Extend digest of (char)0 into PCR-17
+	 * since the D-CRTM and the DCE are not separate.
+	 */
+	rc = drtm_event_log_measure_and_record((uintptr_t)&drtm_null_data,
+					       sizeof(drtm_null_data),
+					       DRTM_EVENT_ARM_DCE, NULL,
+					       PCR_17);
+	CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DCE));
+
+	/* PCR-17: Measure the PCR schema DRTM launch argument. */
+	rc = drtm_event_log_measure_and_record((uintptr_t)&pcr_schema,
+					       sizeof(pcr_schema),
+					       DRTM_EVENT_ARM_PCR_SCHEMA,
+					       NULL, PCR_17);
+	CHECK_RC(rc,
+		 drtm_event_log_measure_and_record(DRTM_EVENT_ARM_PCR_SCHEMA));
+
+	/* PCR-17: Measure the enable state of external-debug, and trace. */
+	/*
+	 * TODO: Measure the enable state of external-debug and trace.  This should
+	 * be returned through a platform-specific hook.
+	 */
+
+	/* PCR-17: Measure the security lifecycle state. */
+	/*
+	 * TODO: Measure the security lifecycle state.  This is an implementation-
+	 * defined value, retrieved through an implementation-defined mechanisms.
+	 */
+
+	/*
+	 * PCR-17: Optionally measure the NWd DCE.
+	 * It is expected that such subsequent DCE stages are signed and verified.
+	 * Whether they are measured in addition to signing is implementation
+	 * -defined.
+	 * Here the choice is to not measure any NWd DCE, in favour of PCR value
+	 * resilience to any NWd DCE updates.
+	 */
+
+	/* PCR-17: End of DCE measurements. */
+	rc = drtm_event_log_measure_and_record((uintptr_t)drtm_event_arm_sep_data,
+					       strlen(drtm_event_arm_sep_data),
+					       DRTM_EVENT_ARM_SEPARATOR, NULL,
+					       PCR_17);
+	CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_SEPARATOR));
+
+	/**
+	 * Measurements extended into PCR-18.
+	 *
+	 * PCR-18: Measure the PCR schema DRTM launch argument.
+	 */
+	rc = drtm_event_log_measure_and_record((uintptr_t)&pcr_schema,
+					       sizeof(pcr_schema),
+					       DRTM_EVENT_ARM_PCR_SCHEMA,
+					       NULL, PCR_18);
+	CHECK_RC(rc,
+		 drtm_event_log_measure_and_record(DRTM_EVENT_ARM_PCR_SCHEMA));
+
+	/*
+	 * PCR-18: Measure the public key used to verify DCE image(s) signatures.
+	 * Extend digest of (char)0, since we do not expect the NWd DCE to be
+	 * present.
+	 */
+	assert(a->dce_nwd_size == 0);
+	rc = drtm_event_log_measure_and_record((uintptr_t)&drtm_null_data,
+					       sizeof(drtm_null_data),
+					       DRTM_EVENT_ARM_DCE_PUBKEY,
+					       NULL, PCR_18);
+	CHECK_RC(rc,
+		 drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DCE_PUBKEY));
+
+	/* PCR-18: Measure the DLME image. */
+	dlme_img_mapping_bytes = page_align(a->dlme_img_size, UP);
+	rc = mmap_add_dynamic_region_alloc_va(a->dlme_paddr + a->dlme_img_off,
+					      &dlme_img_mapping,
+					      dlme_img_mapping_bytes, MT_RO_DATA | MT_NS);
+	if (rc) {
+		WARN("DRTM: %s: mmap_add_dynamic_region() failed rc=%d\n",
+		     __func__, rc);
+		return INTERNAL_ERROR;
+	}
+
+	rc = drtm_event_log_measure_and_record(dlme_img_mapping, a->dlme_img_size,
+					       DRTM_EVENT_ARM_DLME, NULL,
+					       PCR_18);
+	CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DLME));
+
+	rc = mmap_remove_dynamic_region(dlme_img_mapping, dlme_img_mapping_bytes);
+	CHECK_RC(rc, mmap_remove_dynamic_region);
+
+	/* PCR-18: Measure the DLME image entry point. */
+	dlme_img_ep = DL_ARGS_GET_DLME_ENTRY_POINT(a);
+	drtm_event_log_measure_and_record((uintptr_t)&dlme_img_ep,
+					  sizeof(dlme_img_ep),
+					  DRTM_EVENT_ARM_DLME_EP, NULL,
+					  PCR_18);
+	CHECK_RC(rc, drtm_event_log_measure_and_record(DRTM_EVENT_ARM_DLME_EP));
+
+	/* PCR-18: End of DCE measurements. */
+	rc = drtm_event_log_measure_and_record((uintptr_t)drtm_event_arm_sep_data,
+					       strlen(drtm_event_arm_sep_data),
+					       DRTM_EVENT_ARM_SEPARATOR, NULL,
+					       PCR_18);
+	CHECK_RC(rc,
+		 drtm_event_log_measure_and_record(DRTM_EVENT_ARM_SEPARATOR));
+	/*
+	 * If the DCE is unable to log a measurement because there is no available
+	 * space in the event log region, the DCE must extend a hash of the value
+	 * 0xFF (1 byte in size) into PCR[17] and PCR[18] and enter remediation.
+	 */
+
+	return SUCCESS;
+}
+
+void drtm_serialise_event_log(uint8_t *dst, size_t *event_log_size_out)
+{
+	*event_log_size_out = event_log_get_cur_size(drtm_event_log);
+	memcpy(dst, drtm_event_log, *event_log_size_out);
+}
diff --git a/services/std_svc/drtm/drtm_measurements.h b/services/std_svc/drtm/drtm_measurements.h
new file mode 100644
index 0000000..6d7a84e
--- /dev/null
+++ b/services/std_svc/drtm/drtm_measurements.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_MEASUREMENTS_H
+#define DRTM_MEASUREMENTS_H
+
+#include <stdint.h>
+
+#include "drtm_main.h"
+#include <platform_def.h>
+
+#define DRTM_EVENT_ARM_BASE		0x9000U
+#define DRTM_EVENT_TYPE(n)		(DRTM_EVENT_ARM_BASE + (unsigned int)(n))
+
+#define DRTM_EVENT_ARM_PCR_SCHEMA	DRTM_EVENT_TYPE(1)
+#define DRTM_EVENT_ARM_DCE		DRTM_EVENT_TYPE(2)
+#define DRTM_EVENT_ARM_DCE_PUBKEY	DRTM_EVENT_TYPE(3)
+#define DRTM_EVENT_ARM_DLME		DRTM_EVENT_TYPE(4)
+#define DRTM_EVENT_ARM_DLME_EP		DRTM_EVENT_TYPE(5)
+#define DRTM_EVENT_ARM_DEBUG_CONFIG	DRTM_EVENT_TYPE(6)
+#define DRTM_EVENT_ARM_NONSECURE_CONFIG	DRTM_EVENT_TYPE(7)
+#define DRTM_EVENT_ARM_DCE_SECONDARY	DRTM_EVENT_TYPE(8)
+#define DRTM_EVENT_ARM_TZFW		DRTM_EVENT_TYPE(9)
+#define DRTM_EVENT_ARM_SEPARATOR	DRTM_EVENT_TYPE(10)
+
+#define CHECK_RC(rc, func_call) { \
+	if (rc != 0) { \
+		ERROR("%s(): " #func_call "failed unexpectedly rc=%d\n",  \
+		      __func__, rc);  \
+		panic();  \
+	}  \
+}
+
+enum drtm_retc drtm_take_measurements(const struct_drtm_dl_args *a);
+void drtm_serialise_event_log(uint8_t *dst, size_t *event_log_size_out);
+
+#endif /* DRTM_MEASUREMENTS_H */
diff --git a/services/std_svc/drtm/drtm_remediation.c b/services/std_svc/drtm/drtm_remediation.c
new file mode 100644
index 0000000..696b4ea
--- /dev/null
+++ b/services/std_svc/drtm/drtm_remediation.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM support for DRTM error remediation.
+ *
+ */
+#include <inttypes.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include "drtm_main.h"
+#include <plat/common/platform.h>
+
+uint64_t drtm_set_error(uint64_t x1, void *ctx)
+{
+	int rc;
+
+	rc = plat_set_drtm_error(x1);
+
+	if (rc != 0) {
+		SMC_RET1(ctx, INTERNAL_ERROR);
+	}
+
+	SMC_RET1(ctx, SUCCESS);
+}
+
+uint64_t drtm_get_error(void *ctx)
+{
+	uint64_t error_code;
+	int rc;
+
+	rc = plat_get_drtm_error(&error_code);
+
+	if (rc != 0) {
+		SMC_RET1(ctx, INTERNAL_ERROR);
+	}
+
+	SMC_RET2(ctx, SUCCESS, error_code);
+}
+
+void drtm_enter_remediation(uint64_t err_code, const char *err_str)
+{
+	int rc = plat_set_drtm_error(err_code);
+
+	if (rc != 0) {
+		ERROR("%s(): drtm_error_set() failed unexpectedly rc=%d\n",
+		      __func__, rc);
+		panic();
+	}
+
+	ERROR("DRTM: entering remediation of error:\n%" PRIu64 "\t\'%s\'\n",
+	       err_code, err_str);
+
+	ERROR("%s(): system reset is not yet supported\n", __func__);
+	plat_system_reset();
+}
diff --git a/services/std_svc/drtm/drtm_remediation.h b/services/std_svc/drtm/drtm_remediation.h
new file mode 100644
index 0000000..8f965f1
--- /dev/null
+++ b/services/std_svc/drtm/drtm_remediation.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_REMEDIATION_H
+#define DRTM_REMEDIATION_H
+
+uint64_t drtm_set_error(uint64_t x1, void *ctx);
+uint64_t drtm_get_error(void *ctx);
+
+void drtm_enter_remediation(uint64_t error_code, const char *error_str);
+
+#endif /* DRTM_REMEDIATION_H */
diff --git a/services/std_svc/drtm/drtm_res_address_map.c b/services/std_svc/drtm/drtm_res_address_map.c
new file mode 100644
index 0000000..8636706
--- /dev/null
+++ b/services/std_svc/drtm/drtm_res_address_map.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+#include <plat/common/platform.h>
+#include <services/drtm_svc.h>
+#include <platform_def.h>
+
+/* Address map revision generated by this code. */
+#define DRTM_ADDRESS_MAP_REVISION	U(0x0001)
+
+/* Amount of space needed for address map based on PLAT_DRTM_MMAP_ENTRIES */
+#define DRTM_ADDRESS_MAP_SIZE (sizeof(drtm_memory_region_descriptor_table_t) + \
+			       (sizeof(drtm_mem_region_t) * \
+				PLAT_DRTM_MMAP_ENTRIES))
+
+/* Allocate space for DRTM-formatted address map to be constructed. */
+static uint8_t drtm_address_map[DRTM_ADDRESS_MAP_SIZE];
+
+static uint64_t drtm_address_map_size;
+
+drtm_memory_region_descriptor_table_t *drtm_build_address_map(void)
+{
+	/* Set up pointer to DRTM memory map. */
+	drtm_memory_region_descriptor_table_t *map =
+		(drtm_memory_region_descriptor_table_t *)drtm_address_map;
+
+	/* Get the platform memory map. */
+	const mmap_region_t *mmap = plat_get_addr_mmap();
+	unsigned int i;
+
+	/* Set up header for address map structure. */
+	map->revision = DRTM_ADDRESS_MAP_REVISION;
+	map->reserved = 0x0000;
+
+	/* Iterate through mmap and generate DRTM address map. */
+	for (i = 0U; mmap[i].base_pa != 0UL; i++) {
+		/* Set PA of region. */
+		map->region[i].region_address = mmap[i].base_pa;
+
+		/* Set size of region (in 4kb chunks). */
+		map->region[i].region_size_type = 0;
+		ARM_DRTM_REGION_SIZE_TYPE_SET_4K_PAGE_NUM(
+			map->region[i].region_size_type,
+			mmap[i].size / PAGE_SIZE_4KB);
+
+		/* Set type and cacheability. */
+		switch (MT_TYPE(mmap[i].attr)) {
+		case MT_DEVICE:
+			ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE(
+				map->region[i].region_size_type,
+				ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_DEVICE);
+			break;
+		case MT_NON_CACHEABLE:
+			ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE(
+				map->region[i].region_size_type,
+				ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_NCAR);
+			ARM_DRTM_REGION_SIZE_TYPE_SET_CACHEABILITY(
+				map->region[i].region_size_type,
+				ARM_DRTM_REGION_SIZE_TYPE_CACHEABILITY_NC);
+			break;
+		case MT_MEMORY:
+			ARM_DRTM_REGION_SIZE_TYPE_SET_REGION_TYPE(
+				map->region[i].region_size_type,
+				ARM_DRTM_REGION_SIZE_TYPE_REGION_TYPE_NORMAL);
+			break;
+		default:
+			return NULL;
+		}
+	}
+
+	map->num_regions = i;
+
+	/* Store total size of address map. */
+	drtm_address_map_size = sizeof(drtm_memory_region_descriptor_table_t);
+	drtm_address_map_size += (i * sizeof(drtm_mem_region_t));
+
+	return map;
+}
+
+uint64_t drtm_get_address_map_size(void)
+{
+	return drtm_address_map_size;
+}
diff --git a/services/std_svc/pci_svc.c b/services/std_svc/pci_svc.c
new file mode 100644
index 0000000..a02b8a7
--- /dev/null
+++ b/services/std_svc/pci_svc.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <services/pci_svc.h>
+#include <services/std_svc.h>
+#include <smccc_helpers.h>
+
+static uint64_t validate_rw_addr_sz(uint32_t addr, uint64_t off, uint64_t sz)
+{
+	uint32_t nseg;
+	uint32_t ret;
+	uint32_t start_end_bus;
+
+	ret = pci_get_bus_for_seg(PCI_ADDR_SEG(addr), &start_end_bus, &nseg);
+
+	if (ret != SMC_PCI_CALL_SUCCESS) {
+		return SMC_PCI_CALL_INVAL_PARAM;
+	}
+	switch (sz) {
+	case SMC_PCI_SZ_8BIT:
+	case SMC_PCI_SZ_16BIT:
+	case SMC_PCI_SZ_32BIT:
+		break;
+	default:
+		return SMC_PCI_CALL_INVAL_PARAM;
+	}
+	if ((off + sz) > (PCI_OFFSET_MASK + 1U)) {
+		return SMC_PCI_CALL_INVAL_PARAM;
+	}
+	return SMC_PCI_CALL_SUCCESS;
+}
+
+uint64_t pci_smc_handler(uint32_t smc_fid,
+			     u_register_t x1,
+			     u_register_t x2,
+			     u_register_t x3,
+			     u_register_t x4,
+			     void *cookie,
+			     void *handle,
+			     u_register_t flags)
+{
+	switch (smc_fid) {
+	case SMC_PCI_VERSION: {
+		pcie_version ver;
+
+		ver.major = 1U;
+		ver.minor = 0U;
+		SMC_RET4(handle, ver.val, 0U, 0U, 0U);
+	}
+	case SMC_PCI_FEATURES:
+		switch (x1) {
+		case SMC_PCI_VERSION:
+		case SMC_PCI_FEATURES:
+		case SMC_PCI_READ:
+		case SMC_PCI_WRITE:
+		case SMC_PCI_SEG_INFO:
+			SMC_RET1(handle, SMC_PCI_CALL_SUCCESS);
+		default:
+			SMC_RET1(handle, SMC_PCI_CALL_NOT_SUPPORTED);
+		}
+		break;
+	case SMC_PCI_READ: {
+		uint32_t ret;
+
+		if (validate_rw_addr_sz(x1, x2, x3) != SMC_PCI_CALL_SUCCESS) {
+			SMC_RET2(handle, SMC_PCI_CALL_INVAL_PARAM, 0U);
+		}
+		if (x4 != 0U) {
+			SMC_RET2(handle, SMC_PCI_CALL_INVAL_PARAM, 0U);
+		}
+		if (pci_read_config(x1, x2, x3, &ret) != 0U) {
+			SMC_RET2(handle, SMC_PCI_CALL_INVAL_PARAM, 0U);
+		} else {
+			SMC_RET2(handle, SMC_PCI_CALL_SUCCESS, ret);
+		}
+		break;
+	}
+	case SMC_PCI_WRITE: {
+		uint32_t ret;
+
+		if (validate_rw_addr_sz(x1, x2, x3) != SMC_PCI_CALL_SUCCESS) {
+			SMC_RET1(handle, SMC_PCI_CALL_INVAL_PARAM);
+		}
+		ret = pci_write_config(x1, x2, x3, x4);
+		SMC_RET1(handle, ret);
+		break;
+	}
+	case SMC_PCI_SEG_INFO: {
+		uint32_t nseg;
+		uint32_t ret;
+		uint32_t start_end_bus;
+
+		if ((x2 != 0U) || (x3 != 0U) || (x4 != 0U)) {
+		    SMC_RET3(handle, SMC_PCI_CALL_INVAL_PARAM, 0U, 0U);
+		}
+		ret = pci_get_bus_for_seg(x1, &start_end_bus, &nseg);
+		SMC_RET3(handle, ret, start_end_bus, nseg);
+		break;
+	}
+	default:
+		/* should be unreachable */
+		WARN("Unimplemented PCI Service Call: 0x%x\n", smc_fid);
+		SMC_RET1(handle, SMC_PCI_CALL_NOT_SUPPORTED);
+	}
+}
diff --git a/services/std_svc/rmmd/aarch64/rmmd_helpers.S b/services/std_svc/rmmd/aarch64/rmmd_helpers.S
new file mode 100644
index 0000000..6229baf
--- /dev/null
+++ b/services/std_svc/rmmd/aarch64/rmmd_helpers.S
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "../rmmd_private.h"
+#include <asm_macros.S>
+
+	.global rmmd_rmm_enter
+	.global rmmd_rmm_exit
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with SP_EL0 as stack. Here we stash our EL3
+	 * callee-saved registers on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where the address of the C
+	 *  runtime context is to be saved.
+	 * ---------------------------------------------------------------------
+	 */
+func rmmd_rmm_enter
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #RMMD_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #RMMD_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #RMMD_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #RMMD_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #RMMD_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #RMMD_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #RMMD_C_RT_CTX_X29]
+
+	/* ---------------------------------------------------------------------
+	 * Everything is setup now. el3_exit() will use the secure context to
+	 * restore to the general purpose and EL3 system registers to ERET
+	 * into the secure payload.
+	 * ---------------------------------------------------------------------
+	 */
+	b	el3_exit
+endfunc rmmd_rmm_enter
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with 'x0' pointing to a C runtime context.
+	 * It restores the saved registers and jumps to that runtime with 'x0'
+	 * as the new SP register. This destroys the C runtime context that had
+	 * been built on the stack below the saved context by the caller. Later
+	 * the second parameter 'x1' is passed as a return value to the caller.
+	 * ---------------------------------------------------------------------
+	 */
+func rmmd_rmm_exit
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(RMMD_C_RT_CTX_X19 - RMMD_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(RMMD_C_RT_CTX_X21 - RMMD_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(RMMD_C_RT_CTX_X23 - RMMD_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(RMMD_C_RT_CTX_X25 - RMMD_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(RMMD_C_RT_CTX_X27 - RMMD_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(RMMD_C_RT_CTX_X29 - RMMD_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------------------------------
+	 * This should take us back to the instruction after the call to the
+	 * last rmmd_rmm_enter().* Place the second parameter to x0
+	 * so that the caller will see it as a return value from the original
+	 * entry call.
+	 * ---------------------------------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc rmmd_rmm_exit
diff --git a/services/std_svc/rmmd/rmmd.mk b/services/std_svc/rmmd/rmmd.mk
new file mode 100644
index 0000000..bcf54e1
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${ARCH},aarch64)
+        $(error "Error: RMMD is only supported on aarch64.")
+endif
+
+include services/std_svc/rmmd/trp/trp.mk
+
+RMMD_SOURCES	+=	$(addprefix services/std_svc/rmmd/,	\
+			${ARCH}/rmmd_helpers.S			\
+			rmmd_main.c				\
+			rmmd_attest.c)
+
+# Let the top-level Makefile know that we intend to include RMM image
+NEED_RMM	:=	yes
diff --git a/services/std_svc/rmmd/rmmd_attest.c b/services/std_svc/rmmd/rmmd_attest.c
new file mode 100644
index 0000000..25adf50
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd_attest.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <stdint.h>
+#include <string.h>
+
+#include <common/debug.h>
+#include <lib/spinlock.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/platform.h>
+#include "rmmd_private.h"
+#include <services/rmmd_svc.h>
+
+static spinlock_t lock;
+
+/* For printing Realm attestation token hash */
+#define DIGITS_PER_BYTE				2UL
+#define LENGTH_OF_TERMINATING_ZERO_IN_BYTES	1UL
+#define BYTES_PER_LINE_BASE			4UL
+
+static void print_challenge(uint8_t *hash, size_t hash_size)
+{
+	size_t leftover;
+	/*
+	 * bytes_per_line is always a power of two, so it can be used to
+	 * construct mask with it when it is necessary to count remainder.
+	 *
+	 */
+	const size_t bytes_per_line = 1 << BYTES_PER_LINE_BASE;
+	char hash_text[(1 << BYTES_PER_LINE_BASE) * DIGITS_PER_BYTE +
+		LENGTH_OF_TERMINATING_ZERO_IN_BYTES];
+	const char hex_chars[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+				  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+	unsigned int i;
+
+	for (i = 0U; i < hash_size; ++i) {
+		hash_text[(i & (bytes_per_line - 1)) * DIGITS_PER_BYTE] =
+			hex_chars[hash[i] >> 4];
+		hash_text[(i & (bytes_per_line - 1)) * DIGITS_PER_BYTE + 1] =
+			hex_chars[hash[i] & 0x0f];
+		if (((i + 1) & (bytes_per_line - 1)) == 0U) {
+			hash_text[bytes_per_line * DIGITS_PER_BYTE] = '\0';
+			VERBOSE("hash part %u = %s\n",
+				(i >> BYTES_PER_LINE_BASE) + 1, hash_text);
+		}
+	}
+
+	leftover = (size_t)i & (bytes_per_line - 1);
+
+	if (leftover != 0UL) {
+		hash_text[leftover * DIGITS_PER_BYTE] = '\0';
+		VERBOSE("hash part %u = %s\n", (i >> BYTES_PER_LINE_BASE) + 1,
+			hash_text);
+	}
+}
+
+/*
+ * Helper function to validate that the buffer base and length are
+ * within range.
+ */
+static int validate_buffer_params(uint64_t buf_pa, uint64_t buf_len)
+{
+	unsigned long shared_buf_page;
+	uintptr_t shared_buf_base;
+
+	(void)plat_rmmd_get_el3_rmm_shared_mem(&shared_buf_base);
+
+	shared_buf_page = shared_buf_base & ~PAGE_SIZE_MASK;
+
+	/* Validate the buffer pointer */
+	if ((buf_pa & ~PAGE_SIZE_MASK) != shared_buf_page) {
+		ERROR("Buffer PA out of range\n");
+		return E_RMM_BAD_ADDR;
+	}
+
+	/* Validate the size of the shared area */
+	if (((buf_pa + buf_len - 1UL) & ~PAGE_SIZE_MASK) != shared_buf_page) {
+		ERROR("Invalid buffer length\n");
+		return E_RMM_INVAL;
+	}
+
+	return 0; /* No error */
+}
+
+int rmmd_attest_get_platform_token(uint64_t buf_pa, uint64_t *buf_size,
+				   uint64_t c_size)
+{
+	int err;
+	uint8_t temp_buf[SHA512_DIGEST_SIZE];
+
+	err = validate_buffer_params(buf_pa, *buf_size);
+	if (err != 0) {
+		return err;
+	}
+
+	if ((c_size != SHA256_DIGEST_SIZE) &&
+	    (c_size != SHA384_DIGEST_SIZE) &&
+	    (c_size != SHA512_DIGEST_SIZE)) {
+		ERROR("Invalid hash size: %lu\n", c_size);
+		return E_RMM_INVAL;
+	}
+
+	spin_lock(&lock);
+
+	(void)memcpy(temp_buf, (void *)buf_pa, c_size);
+
+	print_challenge((uint8_t *)temp_buf, c_size);
+
+	/* Get the platform token. */
+	err = plat_rmmd_get_cca_attest_token((uintptr_t)buf_pa,
+		buf_size, (uintptr_t)temp_buf, c_size);
+
+	if (err != 0) {
+		ERROR("Failed to get platform token: %d.\n", err);
+		err = E_RMM_UNK;
+	}
+
+	spin_unlock(&lock);
+
+	return err;
+}
+
+int rmmd_attest_get_signing_key(uint64_t buf_pa, uint64_t *buf_size,
+				uint64_t ecc_curve)
+{
+	int err;
+
+	err = validate_buffer_params(buf_pa, *buf_size);
+	if (err != 0) {
+		return err;
+	}
+
+	if (ecc_curve != ATTEST_KEY_CURVE_ECC_SECP384R1) {
+		ERROR("Invalid ECC curve specified\n");
+		return E_RMM_INVAL;
+	}
+
+	spin_lock(&lock);
+
+	/* Get the Realm attestation key. */
+	err = plat_rmmd_get_cca_realm_attest_key((uintptr_t)buf_pa, buf_size,
+						 (unsigned int)ecc_curve);
+	if (err != 0) {
+		ERROR("Failed to get attestation key: %d.\n", err);
+		err =  E_RMM_UNK;
+	}
+
+	spin_unlock(&lock);
+
+	return err;
+}
diff --git a/services/std_svc/rmmd/rmmd_initial_context.h b/services/std_svc/rmmd/rmmd_initial_context.h
new file mode 100644
index 0000000..d7a743d
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd_initial_context.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef RMMD_INITIAL_CONTEXT_H
+#define RMMD_INITIAL_CONTEXT_H
+
+#include <arch.h>
+
+/*
+ * SPSR_EL2
+ *   M=0x9 (0b1001 EL2h)
+ *   M[4]=0
+ *   DAIF=0xF Exceptions masked on entry.
+ *   BTYPE=0  BTI not yet supported.
+ *   SSBS=0   Not yet supported.
+ *   IL=0     Not an illegal exception return.
+ *   SS=0     Not single stepping.
+ *   PAN=1    RMM shouldn't access realm memory.
+ *   UAO=0
+ *   DIT=0
+ *   TCO=0
+ *   NZCV=0
+ */
+#define REALM_SPSR_EL2		(					\
+					SPSR_M_EL2H			| \
+					(0xF << SPSR_DAIF_SHIFT)	| \
+					SPSR_PAN_BIT			\
+				)
+
+#endif /* RMMD_INITIAL_CONTEXT_H */
diff --git a/services/std_svc/rmmd/rmmd_main.c b/services/std_svc/rmmd/rmmd_main.c
new file mode 100644
index 0000000..6bd9fdf
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd_main.c
@@ -0,0 +1,449 @@
+/*
+ * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <arch_features.h>
+#include <bl31/bl31.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <context.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/el3_runtime/pubsub.h>
+#include <lib/gpt_rme/gpt_rme.h>
+
+#include <lib/spinlock.h>
+#include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/common_def.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+#include <services/rmmd_svc.h>
+#include <smccc_helpers.h>
+#include <lib/extensions/sve.h>
+#include "rmmd_initial_context.h"
+#include "rmmd_private.h"
+
+/*******************************************************************************
+ * RMM boot failure flag
+ ******************************************************************************/
+static bool rmm_boot_failed;
+
+/*******************************************************************************
+ * RMM context information.
+ ******************************************************************************/
+rmmd_rmm_context_t rmm_context[PLATFORM_CORE_COUNT];
+
+/*******************************************************************************
+ * RMM entry point information. Discovered on the primary core and reused
+ * on secondary cores.
+ ******************************************************************************/
+static entry_point_info_t *rmm_ep_info;
+
+/*******************************************************************************
+ * Static function declaration.
+ ******************************************************************************/
+static int32_t rmm_init(void);
+
+/*******************************************************************************
+ * This function takes an RMM context pointer and performs a synchronous entry
+ * into it.
+ ******************************************************************************/
+uint64_t rmmd_rmm_sync_entry(rmmd_rmm_context_t *rmm_ctx)
+{
+	uint64_t rc;
+
+	assert(rmm_ctx != NULL);
+
+	cm_set_context(&(rmm_ctx->cpu_ctx), REALM);
+
+	/* Restore the realm context assigned above */
+	cm_el1_sysregs_context_restore(REALM);
+	cm_el2_sysregs_context_restore(REALM);
+	cm_set_next_eret_context(REALM);
+
+	/* Enter RMM */
+	rc = rmmd_rmm_enter(&rmm_ctx->c_rt_ctx);
+
+	/*
+	 * Save realm context. EL1 and EL2 Non-secure
+	 * contexts will be restored before exiting to
+	 * Non-secure world, therefore there is no need
+	 * to clear EL1 and EL2 context registers.
+	 */
+	cm_el1_sysregs_context_save(REALM);
+	cm_el2_sysregs_context_save(REALM);
+
+	return rc;
+}
+
+/*******************************************************************************
+ * This function returns to the place where rmmd_rmm_sync_entry() was
+ * called originally.
+ ******************************************************************************/
+__dead2 void rmmd_rmm_sync_exit(uint64_t rc)
+{
+	rmmd_rmm_context_t *ctx = &rmm_context[plat_my_core_pos()];
+
+	/* Get context of the RMM in use by this CPU. */
+	assert(cm_get_context(REALM) == &(ctx->cpu_ctx));
+
+	/*
+	 * The RMMD must have initiated the original request through a
+	 * synchronous entry into RMM. Jump back to the original C runtime
+	 * context with the value of rc in x0;
+	 */
+	rmmd_rmm_exit(ctx->c_rt_ctx, rc);
+
+	panic();
+}
+
+static void rmm_el2_context_init(el2_sysregs_t *regs)
+{
+	regs->ctx_regs[CTX_SPSR_EL2 >> 3] = REALM_SPSR_EL2;
+	regs->ctx_regs[CTX_SCTLR_EL2 >> 3] = SCTLR_EL2_RES1;
+}
+
+/*******************************************************************************
+ * Enable architecture extensions on first entry to Realm world.
+ ******************************************************************************/
+static void manage_extensions_realm(cpu_context_t *ctx)
+{
+#if ENABLE_SVE_FOR_NS
+	/*
+	 * Enable SVE and FPU in realm context when it is enabled for NS.
+	 * Realm manager must ensure that the SVE and FPU register
+	 * contexts are properly managed.
+	 */
+	sve_enable(ctx);
+#else
+	/*
+	 * Disable SVE and FPU in realm context when it is disabled for NS.
+	 */
+	sve_disable(ctx);
+#endif /* ENABLE_SVE_FOR_NS */
+}
+
+/*******************************************************************************
+ * Jump to the RMM for the first time.
+ ******************************************************************************/
+static int32_t rmm_init(void)
+{
+	long rc;
+	rmmd_rmm_context_t *ctx = &rmm_context[plat_my_core_pos()];
+
+	INFO("RMM init start.\n");
+
+	/* Enable architecture extensions */
+	manage_extensions_realm(&ctx->cpu_ctx);
+
+	/* Initialize RMM EL2 context. */
+	rmm_el2_context_init(&ctx->cpu_ctx.el2_sysregs_ctx);
+
+	rc = rmmd_rmm_sync_entry(ctx);
+	if (rc != E_RMM_BOOT_SUCCESS) {
+		ERROR("RMM init failed: %ld\n", rc);
+		/* Mark the boot as failed for all the CPUs */
+		rmm_boot_failed = true;
+		return 0;
+	}
+
+	INFO("RMM init end.\n");
+
+	return 1;
+}
+
+/*******************************************************************************
+ * Load and read RMM manifest, setup RMM.
+ ******************************************************************************/
+int rmmd_setup(void)
+{
+	size_t shared_buf_size __unused;
+	uintptr_t shared_buf_base;
+	uint32_t ep_attr;
+	unsigned int linear_id = plat_my_core_pos();
+	rmmd_rmm_context_t *rmm_ctx = &rmm_context[linear_id];
+	rmm_manifest_t *manifest;
+	int rc;
+
+	/* Make sure RME is supported. */
+	assert(get_armv9_2_feat_rme_support() != 0U);
+
+	rmm_ep_info = bl31_plat_get_next_image_ep_info(REALM);
+	if (rmm_ep_info == NULL) {
+		WARN("No RMM image provided by BL2 boot loader, Booting "
+		     "device without RMM initialization. SMCs destined for "
+		     "RMM will return SMC_UNK\n");
+		return -ENOENT;
+	}
+
+	/* Under no circumstances will this parameter be 0 */
+	assert(rmm_ep_info->pc == RMM_BASE);
+
+	/* Initialise an entrypoint to set up the CPU context */
+	ep_attr = EP_REALM;
+	if ((read_sctlr_el3() & SCTLR_EE_BIT) != 0U) {
+		ep_attr |= EP_EE_BIG;
+	}
+
+	SET_PARAM_HEAD(rmm_ep_info, PARAM_EP, VERSION_1, ep_attr);
+	rmm_ep_info->spsr = SPSR_64(MODE_EL2,
+					MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+
+	shared_buf_size =
+			plat_rmmd_get_el3_rmm_shared_mem(&shared_buf_base);
+
+	assert((shared_buf_size == SZ_4K) &&
+					((void *)shared_buf_base != NULL));
+
+	/* Load the boot manifest at the beginning of the shared area */
+	manifest = (rmm_manifest_t *)shared_buf_base;
+	rc = plat_rmmd_load_manifest(manifest);
+	if (rc != 0) {
+		ERROR("Error loading RMM Boot Manifest (%i)\n", rc);
+		return rc;
+	}
+	flush_dcache_range((uintptr_t)shared_buf_base, shared_buf_size);
+
+	/*
+	 * Prepare coldboot arguments for RMM:
+	 * arg0: This CPUID (primary processor).
+	 * arg1: Version for this Boot Interface.
+	 * arg2: PLATFORM_CORE_COUNT.
+	 * arg3: Base address for the EL3 <-> RMM shared area. The boot
+	 *       manifest will be stored at the beginning of this area.
+	 */
+	rmm_ep_info->args.arg0 = linear_id;
+	rmm_ep_info->args.arg1 = RMM_EL3_INTERFACE_VERSION;
+	rmm_ep_info->args.arg2 = PLATFORM_CORE_COUNT;
+	rmm_ep_info->args.arg3 = shared_buf_base;
+
+	/* Initialise RMM context with this entry point information */
+	cm_setup_context(&rmm_ctx->cpu_ctx, rmm_ep_info);
+
+	INFO("RMM setup done.\n");
+
+	/* Register init function for deferred init.  */
+	bl31_register_rmm_init(&rmm_init);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Forward SMC to the other security state
+ ******************************************************************************/
+static uint64_t	rmmd_smc_forward(uint32_t src_sec_state,
+				 uint32_t dst_sec_state, uint64_t x0,
+				 uint64_t x1, uint64_t x2, uint64_t x3,
+				 uint64_t x4, void *handle)
+{
+	cpu_context_t *ctx = cm_get_context(dst_sec_state);
+
+	/* Save incoming security state */
+	cm_el1_sysregs_context_save(src_sec_state);
+	cm_el2_sysregs_context_save(src_sec_state);
+
+	/* Restore outgoing security state */
+	cm_el1_sysregs_context_restore(dst_sec_state);
+	cm_el2_sysregs_context_restore(dst_sec_state);
+	cm_set_next_eret_context(dst_sec_state);
+
+	/*
+	 * As per SMCCCv1.2, we need to preserve x4 to x7 unless
+	 * being used as return args. Hence we differentiate the
+	 * onward and backward path. Support upto 8 args in the
+	 * onward path and 4 args in return path.
+	 * Register x4 will be preserved by RMM in case it is not
+	 * used in return path.
+	 */
+	if (src_sec_state == NON_SECURE) {
+		SMC_RET8(ctx, x0, x1, x2, x3, x4,
+			 SMC_GET_GP(handle, CTX_GPREG_X5),
+			 SMC_GET_GP(handle, CTX_GPREG_X6),
+			 SMC_GET_GP(handle, CTX_GPREG_X7));
+	}
+
+	SMC_RET5(ctx, x0, x1, x2, x3, x4);
+}
+
+/*******************************************************************************
+ * This function handles all SMCs in the range reserved for RMI. Each call is
+ * either forwarded to the other security state or handled by the RMM dispatcher
+ ******************************************************************************/
+uint64_t rmmd_rmi_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
+			  uint64_t x3, uint64_t x4, void *cookie,
+			  void *handle, uint64_t flags)
+{
+	uint32_t src_sec_state;
+
+	/* If RMM failed to boot, treat any RMI SMC as unknown */
+	if (rmm_boot_failed) {
+		WARN("RMMD: Failed to boot up RMM. Ignoring RMI call\n");
+		SMC_RET1(handle, SMC_UNK);
+	}
+
+	/* Determine which security state this SMC originated from */
+	src_sec_state = caller_sec_state(flags);
+
+	/* RMI must not be invoked by the Secure world */
+	if (src_sec_state == SMC_FROM_SECURE) {
+		WARN("RMMD: RMI invoked by secure world.\n");
+		SMC_RET1(handle, SMC_UNK);
+	}
+
+	/*
+	 * Forward an RMI call from the Normal world to the Realm world as it
+	 * is.
+	 */
+	if (src_sec_state == SMC_FROM_NON_SECURE) {
+		VERBOSE("RMMD: RMI call from non-secure world.\n");
+		return rmmd_smc_forward(NON_SECURE, REALM, smc_fid,
+					x1, x2, x3, x4, handle);
+	}
+
+	if (src_sec_state != SMC_FROM_REALM) {
+		SMC_RET1(handle, SMC_UNK);
+	}
+
+	switch (smc_fid) {
+	case RMM_RMI_REQ_COMPLETE: {
+		uint64_t x5 = SMC_GET_GP(handle, CTX_GPREG_X5);
+
+		return rmmd_smc_forward(REALM, NON_SECURE, x1,
+					x2, x3, x4, x5, handle);
+	}
+	default:
+		WARN("RMMD: Unsupported RMM call 0x%08x\n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/*******************************************************************************
+ * This cpu has been turned on. Enter RMM to initialise R-EL2.  Entry into RMM
+ * is done after initialising minimal architectural state that guarantees safe
+ * execution.
+ ******************************************************************************/
+static void *rmmd_cpu_on_finish_handler(const void *arg)
+{
+	long rc;
+	uint32_t linear_id = plat_my_core_pos();
+	rmmd_rmm_context_t *ctx = &rmm_context[linear_id];
+
+	if (rmm_boot_failed) {
+		/* RMM Boot failed on a previous CPU. Abort. */
+		ERROR("RMM Failed to initialize. Ignoring for CPU%d\n",
+								linear_id);
+		return NULL;
+	}
+
+	/*
+	 * Prepare warmboot arguments for RMM:
+	 * arg0: This CPUID.
+	 * arg1 to arg3: Not used.
+	 */
+	rmm_ep_info->args.arg0 = linear_id;
+	rmm_ep_info->args.arg1 = 0ULL;
+	rmm_ep_info->args.arg2 = 0ULL;
+	rmm_ep_info->args.arg3 = 0ULL;
+
+	/* Initialise RMM context with this entry point information */
+	cm_setup_context(&ctx->cpu_ctx, rmm_ep_info);
+
+	/* Enable architecture extensions */
+	manage_extensions_realm(&ctx->cpu_ctx);
+
+	/* Initialize RMM EL2 context. */
+	rmm_el2_context_init(&ctx->cpu_ctx.el2_sysregs_ctx);
+
+	rc = rmmd_rmm_sync_entry(ctx);
+
+	if (rc != E_RMM_BOOT_SUCCESS) {
+		ERROR("RMM init failed on CPU%d: %ld\n", linear_id, rc);
+		/* Mark the boot as failed for any other booting CPU */
+		rmm_boot_failed = true;
+	}
+
+	return NULL;
+}
+
+/* Subscribe to PSCI CPU on to initialize RMM on secondary */
+SUBSCRIBE_TO_EVENT(psci_cpu_on_finish, rmmd_cpu_on_finish_handler);
+
+/* Convert GPT lib error to RMMD GTS error */
+static int gpt_to_gts_error(int error, uint32_t smc_fid, uint64_t address)
+{
+	int ret;
+
+	if (error == 0) {
+		return E_RMM_OK;
+	}
+
+	if (error == -EINVAL) {
+		ret = E_RMM_BAD_ADDR;
+	} else {
+		/* This is the only other error code we expect */
+		assert(error == -EPERM);
+		ret = E_RMM_BAD_PAS;
+	}
+
+	ERROR("RMMD: PAS Transition failed. GPT ret = %d, PA: 0x%"PRIx64 ", FID = 0x%x\n",
+				error, address, smc_fid);
+	return ret;
+}
+
+/*******************************************************************************
+ * This function handles RMM-EL3 interface SMCs
+ ******************************************************************************/
+uint64_t rmmd_rmm_el3_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2,
+				uint64_t x3, uint64_t x4, void *cookie,
+				void *handle, uint64_t flags)
+{
+	uint32_t src_sec_state;
+	int ret;
+
+	/* If RMM failed to boot, treat any RMM-EL3 interface SMC as unknown */
+	if (rmm_boot_failed) {
+		WARN("RMMD: Failed to boot up RMM. Ignoring RMM-EL3 call\n");
+		SMC_RET1(handle, SMC_UNK);
+	}
+
+	/* Determine which security state this SMC originated from */
+	src_sec_state = caller_sec_state(flags);
+
+	if (src_sec_state != SMC_FROM_REALM) {
+		WARN("RMMD: RMM-EL3 call originated from secure or normal world\n");
+		SMC_RET1(handle, SMC_UNK);
+	}
+
+	switch (smc_fid) {
+	case RMM_GTSI_DELEGATE:
+		ret = gpt_delegate_pas(x1, PAGE_SIZE_4KB, SMC_FROM_REALM);
+		SMC_RET1(handle, gpt_to_gts_error(ret, smc_fid, x1));
+	case RMM_GTSI_UNDELEGATE:
+		ret = gpt_undelegate_pas(x1, PAGE_SIZE_4KB, SMC_FROM_REALM);
+		SMC_RET1(handle, gpt_to_gts_error(ret, smc_fid, x1));
+	case RMM_ATTEST_GET_PLAT_TOKEN:
+		ret = rmmd_attest_get_platform_token(x1, &x2, x3);
+		SMC_RET2(handle, ret, x2);
+	case RMM_ATTEST_GET_REALM_KEY:
+		ret = rmmd_attest_get_signing_key(x1, &x2, x3);
+		SMC_RET2(handle, ret, x2);
+
+	case RMM_BOOT_COMPLETE:
+		VERBOSE("RMMD: running rmmd_rmm_sync_exit\n");
+		rmmd_rmm_sync_exit(x1);
+
+	default:
+		WARN("RMMD: Unsupported RMM-EL3 call 0x%08x\n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
diff --git a/services/std_svc/rmmd/rmmd_private.h b/services/std_svc/rmmd/rmmd_private.h
new file mode 100644
index 0000000..4954a43
--- /dev/null
+++ b/services/std_svc/rmmd/rmmd_private.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef RMMD_PRIVATE_H
+#define RMMD_PRIVATE_H
+
+#include <context.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define RMMD_C_RT_CTX_X19		0x0
+#define RMMD_C_RT_CTX_X20		0x8
+#define RMMD_C_RT_CTX_X21		0x10
+#define RMMD_C_RT_CTX_X22		0x18
+#define RMMD_C_RT_CTX_X23		0x20
+#define RMMD_C_RT_CTX_X24		0x28
+#define RMMD_C_RT_CTX_X25		0x30
+#define RMMD_C_RT_CTX_X26		0x38
+#define RMMD_C_RT_CTX_X27		0x40
+#define RMMD_C_RT_CTX_X28		0x48
+#define RMMD_C_RT_CTX_X29		0x50
+#define RMMD_C_RT_CTX_X30		0x58
+
+#define RMMD_C_RT_CTX_SIZE		0x60
+#define RMMD_C_RT_CTX_ENTRIES		(RMMD_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+#include <stdint.h>
+
+/*
+ * Data structure used by the RMM dispatcher (RMMD) in EL3 to track context of
+ * the RMM at R-EL2.
+ */
+typedef struct rmmd_rmm_context {
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+} rmmd_rmm_context_t;
+
+/* Functions used to enter/exit the RMM synchronously */
+uint64_t rmmd_rmm_sync_entry(rmmd_rmm_context_t *ctx);
+__dead2 void rmmd_rmm_sync_exit(uint64_t rc);
+
+/* Functions implementing attestation utilities for RMM */
+int rmmd_attest_get_platform_token(uint64_t buf_pa, uint64_t *buf_size,
+				   uint64_t c_size);
+int rmmd_attest_get_signing_key(uint64_t buf_pa, uint64_t *buf_size,
+				uint64_t ecc_curve);
+
+/* Assembly helpers */
+uint64_t rmmd_rmm_enter(uint64_t *c_rt_ctx);
+void __dead2 rmmd_rmm_exit(uint64_t c_rt_ctx, uint64_t ret);
+
+/* Reference to PM ops for the RMMD */
+extern const spd_pm_ops_t rmmd_pm;
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* RMMD_PRIVATE_H */
diff --git a/services/std_svc/rmmd/trp/linker.lds b/services/std_svc/rmmd/trp/linker.lds
new file mode 100644
index 0000000..2b7f383
--- /dev/null
+++ b/services/std_svc/rmmd/trp/linker.lds
@@ -0,0 +1,71 @@
+/*
+ * (C) COPYRIGHT 2021 Arm Limited or its affiliates.
+ * ALL RIGHTS RESERVED
+ */
+
+#include <common/bl_common.ld.h>
+#include <lib/xlat_tables/xlat_tables_defs.h>
+
+/* Mapped using 4K pages, requires us to align different sections with
+ * different property at the same granularity. */
+PAGE_SIZE_4K = 4096;
+
+OUTPUT_FORMAT("elf64-littleaarch64")
+OUTPUT_ARCH(aarch64)
+ENTRY(trp_head)
+
+MEMORY {
+	RAM (rwx): ORIGIN = RMM_BASE, LENGTH = RMM_LIMIT - RMM_BASE
+}
+
+
+SECTIONS
+{
+	. = RMM_BASE;
+
+	.text : {
+		*(.head.text)
+		. = ALIGN(8);
+		*(.text*)
+	} >RAM
+
+	. = ALIGN(PAGE_SIZE_4K);
+
+	.rodata : {
+		*(.rodata*)
+	} >RAM
+
+	. = ALIGN(PAGE_SIZE_4K);
+
+	 __RW_START__ = . ;
+
+	.data : {
+		*(.data*)
+	} >RAM
+
+	.bss (NOLOAD) : {
+		__BSS_START__ = .;
+		*(.bss*)
+		__BSS_END__ = .;
+	} >RAM
+	__BSS_SIZE__ = SIZEOF(.bss);
+
+
+	STACK_SECTION >RAM
+
+
+	/*
+	* Define a linker symbol to mark the end of the RW memory area for this
+	* image.
+	*/
+	__RW_END__ = .;
+	__RMM_END__ = .;
+
+
+	/DISCARD/ : { *(.dynstr*) }
+	/DISCARD/ : { *(.dynamic*) }
+	/DISCARD/ : { *(.plt*) }
+	/DISCARD/ : { *(.interp*) }
+	/DISCARD/ : { *(.gnu*) }
+	/DISCARD/ : { *(.note*) }
+}
diff --git a/services/std_svc/rmmd/trp/trp.mk b/services/std_svc/rmmd/trp/trp.mk
new file mode 100644
index 0000000..44bbf22
--- /dev/null
+++ b/services/std_svc/rmmd/trp/trp.mk
@@ -0,0 +1,21 @@
+#
+# Copyright (c) 2021-2022 Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+RMM_SOURCES		+=	services/std_svc/rmmd/trp/trp_entry.S \
+				services/std_svc/rmmd/trp/trp_main.c  \
+				services/std_svc/rmmd/trp/trp_helpers.c
+
+RMM_LINKERFILE		:=	services/std_svc/rmmd/trp/linker.lds
+
+# Include the platform-specific TRP Makefile
+# If no platform-specific TRP Makefile exists, it means TRP is not supported
+# on this platform.
+TRP_PLAT_MAKEFILE := $(wildcard ${PLAT_DIR}/trp/trp-${PLAT}.mk)
+ifeq (,${TRP_PLAT_MAKEFILE})
+  $(error TRP is not supported on platform ${PLAT})
+else
+  include ${TRP_PLAT_MAKEFILE}
+endif
diff --git a/services/std_svc/rmmd/trp/trp_entry.S b/services/std_svc/rmmd/trp/trp_entry.S
new file mode 100644
index 0000000..47c1df1
--- /dev/null
+++ b/services/std_svc/rmmd/trp/trp_entry.S
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021-2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include <services/rmmd_svc.h>
+
+#include <platform_def.h>
+#include "trp_private.h"
+
+.global trp_head
+.global trp_smc
+
+.section ".head.text", "ax"
+
+	/* ---------------------------------------------
+	 * Populate the params in x0-x7 from the pointer
+	 * to the smc args structure in x0.
+	 * ---------------------------------------------
+	 */
+	.macro restore_args_call_smc
+	ldp	x6, x7, [x0, #TRP_ARG6]
+	ldp	x4, x5, [x0, #TRP_ARG4]
+	ldp	x2, x3, [x0, #TRP_ARG2]
+	ldp	x0, x1, [x0, #TRP_ARG0]
+	smc	#0
+	.endm
+
+	/* ---------------------------------------------
+	 * Entry point for TRP
+	 * ---------------------------------------------
+	 */
+trp_head:
+	/*
+	 * Stash arguments from previous boot stage
+	 */
+	mov	x20, x0
+	mov	x21, x1
+	mov	x22, x2
+	mov	x23, x3
+
+	/*
+	 * Validate CPUId before allocating a stack.
+	 */
+	cmp	x20, #PLATFORM_CORE_COUNT
+	b.lo	1f
+
+	mov_imm	x0, RMM_BOOT_COMPLETE
+	mov_imm	x1, E_RMM_BOOT_CPU_ID_OUT_OF_RANGE
+	smc	#0
+
+	/* EL3 should never return back here, so panic if it does */
+	b	trp_panic
+
+1:
+	bl	plat_set_my_stack
+
+	/*
+	 * Find out whether this is a cold or warm boot
+	 */
+	ldr	x1, cold_boot_flag
+	cbz	x1, warm_boot
+
+	/*
+	 * Update cold boot flag to indicate cold boot is done
+	 */
+	adr	x2, cold_boot_flag
+	str	xzr, [x2]
+
+	/* ---------------------------------------------
+	 * Zero out BSS section
+	 * ---------------------------------------------
+	 */
+	ldr	x0, =__BSS_START__
+	ldr	x1, =__BSS_SIZE__
+	bl	zeromem
+
+	mov	x0, x20
+	mov	x1, x21
+	mov	x2, x22
+	mov	x3, x23
+	bl	trp_setup
+	bl	trp_main
+warm_boot:
+	mov_imm	x0, RMM_BOOT_COMPLETE
+	mov	x1, xzr /* RMM_BOOT_SUCCESS */
+	smc	#0
+	b	trp_handler
+
+trp_panic:
+	no_ret plat_panic_handler
+
+	/*
+	 * Flag to mark if it is a cold boot.
+	 * 1: cold boot, 0: warmboot.
+	 */
+.align 3
+cold_boot_flag:
+	.dword		1
+
+	/* ---------------------------------------------
+	 *   Direct SMC call to BL31 service provided by
+	 *   RMM Dispatcher
+	 * ---------------------------------------------
+	 */
+func trp_smc
+	restore_args_call_smc
+	ret
+endfunc trp_smc
+
+	/* ---------------------------------------------
+	 * RMI call handler
+	 * ---------------------------------------------
+	 */
+func trp_handler
+	bl	trp_rmi_handler
+	restore_args_call_smc
+	b	trp_handler
+endfunc trp_handler
diff --git a/services/std_svc/rmmd/trp/trp_helpers.c b/services/std_svc/rmmd/trp/trp_helpers.c
new file mode 100644
index 0000000..159f3a5
--- /dev/null
+++ b/services/std_svc/rmmd/trp/trp_helpers.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+#include <plat/common/platform.h>
+#include <services/rmmd_svc.h>
+#include "trp_private.h"
+
+/*
+ * Per cpu data structure to populate parameters for an SMC in C code and use
+ * a pointer to this structure in assembler code to populate x0-x7
+ */
+static trp_args_t trp_smc_args[PLATFORM_CORE_COUNT];
+
+/*
+ * Set the arguments for SMC call
+ */
+trp_args_t *set_smc_args(uint64_t arg0,
+			uint64_t arg1,
+			uint64_t arg2,
+			uint64_t arg3,
+			uint64_t arg4,
+			uint64_t arg5,
+			uint64_t arg6,
+			uint64_t arg7)
+{
+	uint32_t linear_id;
+	trp_args_t *pcpu_smc_args;
+
+	/*
+	 * Return to Secure Monitor by raising an SMC. The results of the
+	 * service are passed as an arguments to the SMC
+	 */
+	linear_id = plat_my_core_pos();
+	pcpu_smc_args = &trp_smc_args[linear_id];
+	write_trp_arg(pcpu_smc_args, TRP_ARG0, arg0);
+	write_trp_arg(pcpu_smc_args, TRP_ARG1, arg1);
+	write_trp_arg(pcpu_smc_args, TRP_ARG2, arg2);
+	write_trp_arg(pcpu_smc_args, TRP_ARG3, arg3);
+	write_trp_arg(pcpu_smc_args, TRP_ARG4, arg4);
+	write_trp_arg(pcpu_smc_args, TRP_ARG5, arg5);
+	write_trp_arg(pcpu_smc_args, TRP_ARG6, arg6);
+	write_trp_arg(pcpu_smc_args, TRP_ARG7, arg7);
+
+	return pcpu_smc_args;
+}
+
+/*
+ * Abort the boot process with the reason given in err.
+ */
+__dead2 void trp_boot_abort(uint64_t err)
+{
+	(void)trp_smc(set_smc_args(RMM_BOOT_COMPLETE, err, 0, 0, 0, 0, 0, 0));
+	panic();
+}
diff --git a/services/std_svc/rmmd/trp/trp_main.c b/services/std_svc/rmmd/trp/trp_main.c
new file mode 100644
index 0000000..5a56af0
--- /dev/null
+++ b/services/std_svc/rmmd/trp/trp_main.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2021-2022, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+#include <common/debug.h>
+#include <plat/common/platform.h>
+#include <services/rmm_core_manifest.h>
+#include <services/rmmd_svc.h>
+#include <services/trp/platform_trp.h>
+#include <trp_helpers.h>
+#include "trp_private.h"
+
+#include <platform_def.h>
+
+/* Parameters received from the previous image */
+static unsigned int trp_boot_abi_version;
+static uintptr_t trp_shared_region_start;
+
+/* Parameters received from boot manifest */
+uint32_t trp_boot_manifest_version;
+
+/*******************************************************************************
+ * Setup function for TRP.
+ ******************************************************************************/
+void trp_setup(uint64_t x0,
+	       uint64_t x1,
+	       uint64_t x2,
+	       uint64_t x3)
+{
+	/*
+	 * Validate boot parameters.
+	 *
+	 * According to the Boot Interface ABI v.0.1, the
+	 * parameters recived from EL3 are:
+	 * x0: CPUID (verified earlier so not used)
+	 * x1: Boot Interface version
+	 * x2: PLATFORM_CORE_COUNT
+	 * x3: Pointer to the shared memory area.
+	 */
+
+	(void)x0;
+
+	if (TRP_RMM_EL3_VERSION_GET_MAJOR(x1) != TRP_RMM_EL3_ABI_VERS_MAJOR) {
+		trp_boot_abort(E_RMM_BOOT_VERSION_MISMATCH);
+	}
+
+	if ((void *)x3 == NULL) {
+		trp_boot_abort(E_RMM_BOOT_INVALID_SHARED_BUFFER);
+	}
+
+	if (x2 > TRP_PLATFORM_CORE_COUNT) {
+		trp_boot_abort(E_RMM_BOOT_CPUS_OUT_OF_RANGE);
+	}
+
+	trp_boot_abi_version = x1;
+	trp_shared_region_start = x3;
+	flush_dcache_range((uintptr_t)&trp_boot_abi_version,
+			   sizeof(trp_boot_abi_version));
+	flush_dcache_range((uintptr_t)&trp_shared_region_start,
+			   sizeof(trp_shared_region_start));
+
+	/* Perform early platform-specific setup */
+	trp_early_platform_setup((rmm_manifest_t *)trp_shared_region_start);
+}
+
+/* Main function for TRP */
+void trp_main(void)
+{
+	NOTICE("TRP: %s\n", version_string);
+	NOTICE("TRP: %s\n", build_message);
+	NOTICE("TRP: Supported RMM-EL3 Interface ABI: v.%u.%u\n",
+		TRP_RMM_EL3_ABI_VERS_MAJOR, TRP_RMM_EL3_ABI_VERS_MINOR);
+	NOTICE("TRP: Boot Manifest Version : v.%u.%u\n",
+		RMMD_GET_MANIFEST_VERSION_MAJOR(trp_boot_manifest_version),
+		RMMD_GET_MANIFEST_VERSION_MINOR(trp_boot_manifest_version));
+	INFO("TRP: Memory base : 0x%lx\n", (unsigned long)RMM_BASE);
+	INFO("TRP: Base address for the shared region : 0x%lx\n",
+			(unsigned long)trp_shared_region_start);
+	INFO("TRP: Total size : 0x%lx bytes\n", (unsigned long)(RMM_END
+								- RMM_BASE));
+	INFO("TRP: RMM-EL3 Interface ABI reported by EL3: v.%u.%u\n",
+		TRP_RMM_EL3_VERSION_GET_MAJOR(trp_boot_abi_version),
+		TRP_RMM_EL3_VERSION_GET_MINOR(trp_boot_abi_version));
+}
+
+/*******************************************************************************
+ * Returning RMI version back to Normal World
+ ******************************************************************************/
+static trp_args_t *trp_ret_rmi_version(void)
+{
+	VERBOSE("RMM version is %u.%u\n", RMI_ABI_VERSION_MAJOR,
+					  RMI_ABI_VERSION_MINOR);
+	return set_smc_args(RMM_RMI_REQ_COMPLETE, RMI_ABI_VERSION,
+			    0, 0, 0, 0, 0, 0);
+}
+
+/*******************************************************************************
+ * Transitioning granule of NON-SECURE type to REALM type
+ ******************************************************************************/
+static trp_args_t *trp_asc_mark_realm(unsigned long long x1)
+{
+	unsigned long long ret;
+
+	VERBOSE("Delegating granule 0x%llx\n", x1);
+	ret = trp_smc(set_smc_args(RMM_GTSI_DELEGATE, x1, 0, 0, 0, 0, 0, 0));
+
+	if (ret != 0ULL) {
+		ERROR("Granule transition from NON-SECURE type to REALM type "
+			"failed 0x%llx\n", ret);
+	}
+	return set_smc_args(RMM_RMI_REQ_COMPLETE, ret, 0, 0, 0, 0, 0, 0);
+}
+
+/*******************************************************************************
+ * Transitioning granule of REALM type to NON-SECURE type
+ ******************************************************************************/
+static trp_args_t *trp_asc_mark_nonsecure(unsigned long long x1)
+{
+	unsigned long long ret;
+
+	VERBOSE("Undelegating granule 0x%llx\n", x1);
+	ret = trp_smc(set_smc_args(RMM_GTSI_UNDELEGATE, x1, 0, 0, 0, 0, 0, 0));
+
+	if (ret != 0ULL) {
+		ERROR("Granule transition from REALM type to NON-SECURE type "
+			"failed 0x%llx\n", ret);
+	}
+	return set_smc_args(RMM_RMI_REQ_COMPLETE, ret, 0, 0, 0, 0, 0, 0);
+}
+
+/*******************************************************************************
+ * Main RMI SMC handler function
+ ******************************************************************************/
+trp_args_t *trp_rmi_handler(unsigned long fid, unsigned long long x1)
+{
+	switch (fid) {
+	case RMI_RMM_REQ_VERSION:
+		return trp_ret_rmi_version();
+	case RMI_RMM_GRANULE_DELEGATE:
+		return trp_asc_mark_realm(x1);
+	case RMI_RMM_GRANULE_UNDELEGATE:
+		return trp_asc_mark_nonsecure(x1);
+	default:
+		ERROR("Invalid SMC code to %s, FID %lu\n", __func__, fid);
+	}
+	return set_smc_args(SMC_UNK, 0, 0, 0, 0, 0, 0, 0);
+}
diff --git a/services/std_svc/rmmd/trp/trp_private.h b/services/std_svc/rmmd/trp/trp_private.h
new file mode 100644
index 0000000..945ae1c
--- /dev/null
+++ b/services/std_svc/rmmd/trp/trp_private.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2021-2022, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef TRP_PRIVATE_H
+#define TRP_PRIVATE_H
+
+#include <services/rmmd_svc.h>
+#include <trp_helpers.h>
+
+/* Definitions for RMM-EL3 Interface ABI VERSION */
+#define TRP_RMM_EL3_ABI_VERS_MAJOR	RMM_EL3_IFC_VERSION_MAJOR
+#define TRP_RMM_EL3_ABI_VERS_MINOR	RMM_EL3_IFC_VERSION_MINOR
+#define TRP_RMM_EL3_ABI_VERS	(((TRP_RMM_EL3_ABI_VERS_MAJOR & 0x7FFF) << 16) | \
+				 (TRP_RMM_EL3_ABI_VERS_MINOR & 0xFFFF))
+
+#define TRP_PLATFORM_CORE_COUNT		PLATFORM_CORE_COUNT
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#define write_trp_arg(args, offset, val) (((args)->regs[offset >> 3])	\
+					 = val)
+/* RMI SMC64 FIDs handled by the TRP */
+#define RMI_RMM_REQ_VERSION		SMC64_RMI_FID(U(0))
+#define RMI_RMM_GRANULE_DELEGATE	SMC64_RMI_FID(U(1))
+#define RMI_RMM_GRANULE_UNDELEGATE	SMC64_RMI_FID(U(2))
+
+/* Definitions for RMI VERSION */
+#define RMI_ABI_VERSION_MAJOR		U(0x0)
+#define RMI_ABI_VERSION_MINOR		U(0x0)
+#define RMI_ABI_VERSION			(((RMI_ABI_VERSION_MAJOR & 0x7FFF) \
+								  << 16) | \
+					 (RMI_ABI_VERSION_MINOR & 0xFFFF))
+
+#define TRP_RMM_EL3_VERSION_GET_MAJOR(x)		\
+				RMM_EL3_IFC_VERSION_GET_MAJOR((x))
+#define TRP_RMM_EL3_VERSION_GET_MINOR(x)		\
+				RMM_EL3_IFC_VERSION_GET_MAJOR_MINOR((x))
+
+/* Helper to issue SMC calls to BL31 */
+uint64_t trp_smc(trp_args_t *);
+
+/* The main function to executed only by Primary CPU */
+void trp_main(void);
+
+/* Setup TRP. Executed only by Primary CPU */
+void trp_setup(uint64_t x0,
+	       uint64_t x1,
+	       uint64_t x2,
+	       uint64_t x3);
+
+#endif /* __ASSEMBLER__ */
+#endif /* TRP_PRIVATE_H */
diff --git a/services/std_svc/sdei/sdei_dispatch.S b/services/std_svc/sdei/sdei_dispatch.S
new file mode 100644
index 0000000..8449e4b
--- /dev/null
+++ b/services/std_svc/sdei/sdei_dispatch.S
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+
+	.globl	begin_sdei_synchronous_dispatch
+
+/*
+ * void begin_sdei_synchronous_dispatch(jmp_buf *buffer);
+ *
+ * Begin SDEI dispatch synchronously by setting up a jump point, and exiting
+ * EL3. This jump point is jumped to by the dispatcher after the event is
+ * completed by the client.
+ */
+func begin_sdei_synchronous_dispatch
+	stp	x30, xzr, [sp, #-16]!
+	bl	setjmp
+	cbz	x0, 1f
+	ldp	x30, xzr, [sp], #16
+	ret
+1:
+	b	el3_exit
+endfunc begin_sdei_synchronous_dispatch
diff --git a/services/std_svc/sdei/sdei_event.c b/services/std_svc/sdei/sdei_event.c
new file mode 100644
index 0000000..e0c7971
--- /dev/null
+++ b/services/std_svc/sdei/sdei_event.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2017-2022, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <lib/utils.h>
+
+#include "sdei_private.h"
+
+#define MAP_OFF(_map, _mapping) ((_map) - (_mapping)->map)
+
+/*
+ * Get SDEI entry with the given mapping: on success, returns pointer to SDEI
+ * entry. On error, returns NULL.
+ *
+ * Both shared and private maps are stored in single-dimensional array. Private
+ * event entries are kept for each PE forming a 2D array.
+ */
+sdei_entry_t *get_event_entry(sdei_ev_map_t *map)
+{
+	const sdei_mapping_t *mapping;
+	sdei_entry_t *cpu_priv_base;
+	unsigned int base_idx;
+	long int idx;
+
+	if (is_event_private(map)) {
+		/*
+		 * For a private map, find the index of the mapping in the
+		 * array.
+		 */
+		mapping = SDEI_PRIVATE_MAPPING();
+		idx = MAP_OFF(map, mapping);
+
+		/* Base of private mappings for this CPU */
+		base_idx = plat_my_core_pos() * ((unsigned int) mapping->num_maps);
+		cpu_priv_base = &sdei_private_event_table[base_idx];
+
+		/*
+		 * Return the address of the entry at the same index in the
+		 * per-CPU event entry.
+		 */
+		return &cpu_priv_base[idx];
+	} else {
+		mapping = SDEI_SHARED_MAPPING();
+		idx = MAP_OFF(map, mapping);
+
+		return &sdei_shared_event_table[idx];
+	}
+}
+
+/*
+ * Find event mapping for a given interrupt number: On success, returns pointer
+ * to the event mapping. On error, returns NULL.
+ */
+sdei_ev_map_t *find_event_map_by_intr(unsigned int intr_num, bool shared)
+{
+	const sdei_mapping_t *mapping;
+	sdei_ev_map_t *map;
+	unsigned int i;
+
+	/*
+	 * Look for a match in private and shared mappings, as requested. This
+	 * is a linear search. However, if the mappings are required to be
+	 * sorted, for large maps, we could consider binary search.
+	 */
+	mapping = shared ? SDEI_SHARED_MAPPING() : SDEI_PRIVATE_MAPPING();
+	iterate_mapping(mapping, i, map) {
+		if (map->intr == intr_num)
+			return map;
+	}
+
+	return NULL;
+}
+
+/*
+ * Find event mapping for a given event number: On success returns pointer to
+ * the event mapping. On error, returns NULL.
+ */
+sdei_ev_map_t *find_event_map(int ev_num)
+{
+	const sdei_mapping_t *mapping;
+	sdei_ev_map_t *map;
+	unsigned int i, j;
+
+	/*
+	 * Iterate through mappings to find a match. This is a linear search.
+	 * However, if the mappings are required to be sorted, for large maps,
+	 * we could consider binary search.
+	 */
+	for_each_mapping_type(i, mapping) {
+		iterate_mapping(mapping, j, map) {
+			if (map->ev_num == ev_num)
+				return map;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * Return the total number of currently registered SDEI events.
+ */
+int sdei_get_registered_event_count(void)
+{
+	const sdei_mapping_t *mapping;
+	sdei_ev_map_t *map;
+	unsigned int i;
+	unsigned int j;
+	int count = 0;
+
+	/* Add up reg counts for each mapping. */
+	for_each_mapping_type(i, mapping) {
+		iterate_mapping(mapping, j, map) {
+			count += map->reg_count;
+		}
+	}
+
+	return count;
+}
diff --git a/services/std_svc/sdei/sdei_intr_mgmt.c b/services/std_svc/sdei/sdei_intr_mgmt.c
new file mode 100644
index 0000000..87a1fb7
--- /dev/null
+++ b/services/std_svc/sdei/sdei_intr_mgmt.c
@@ -0,0 +1,774 @@
+/*
+ * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <arch_features.h>
+#include <bl31/ehf.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/cassert.h>
+#include <services/sdei.h>
+
+#include "sdei_private.h"
+
+/* x0-x17 GPREGS context */
+#define SDEI_SAVED_GPREGS	18U
+
+/* Maximum preemption nesting levels: Critical priority and Normal priority */
+#define MAX_EVENT_NESTING	2U
+
+/* Per-CPU SDEI state access macro */
+#define sdei_get_this_pe_state()	(&cpu_state[plat_my_core_pos()])
+
+/* Structure to store information about an outstanding dispatch */
+typedef struct sdei_dispatch_context {
+	sdei_ev_map_t *map;
+	uint64_t x[SDEI_SAVED_GPREGS];
+	jmp_buf *dispatch_jmp;
+
+	/* Exception state registers */
+	uint64_t elr_el3;
+	uint64_t spsr_el3;
+
+#if DYNAMIC_WORKAROUND_CVE_2018_3639
+	/* CVE-2018-3639 mitigation state */
+	uint64_t disable_cve_2018_3639;
+#endif
+} sdei_dispatch_context_t;
+
+/* Per-CPU SDEI state data */
+typedef struct sdei_cpu_state {
+	sdei_dispatch_context_t dispatch_stack[MAX_EVENT_NESTING];
+	unsigned short stack_top; /* Empty ascending */
+	bool pe_masked;
+	bool pending_enables;
+} sdei_cpu_state_t;
+
+/* SDEI states for all cores in the system */
+static sdei_cpu_state_t cpu_state[PLATFORM_CORE_COUNT];
+
+int64_t sdei_pe_mask(void)
+{
+	int64_t ret = 0;
+	sdei_cpu_state_t *state = sdei_get_this_pe_state();
+
+	/*
+	 * Return value indicates whether this call had any effect in the mask
+	 * status of this PE.
+	 */
+	if (!state->pe_masked) {
+		state->pe_masked = true;
+		ret = 1;
+	}
+
+	return ret;
+}
+
+void sdei_pe_unmask(void)
+{
+	unsigned int i;
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+	sdei_cpu_state_t *state = sdei_get_this_pe_state();
+	uint64_t my_mpidr = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+	/*
+	 * If there are pending enables, iterate through the private mappings
+	 * and enable those bound maps that are in enabled state. Also, iterate
+	 * through shared mappings and enable interrupts of events that are
+	 * targeted to this PE.
+	 */
+	if (state->pending_enables) {
+		for_each_private_map(i, map) {
+			se = get_event_entry(map);
+			if (is_map_bound(map) && GET_EV_STATE(se, ENABLED))
+				plat_ic_enable_interrupt(map->intr);
+		}
+
+		for_each_shared_map(i, map) {
+			se = get_event_entry(map);
+
+			sdei_map_lock(map);
+			if (is_map_bound(map) && GET_EV_STATE(se, ENABLED) &&
+					(se->reg_flags == SDEI_REGF_RM_PE) &&
+					(se->affinity == my_mpidr)) {
+				plat_ic_enable_interrupt(map->intr);
+			}
+			sdei_map_unlock(map);
+		}
+	}
+
+	state->pending_enables = false;
+	state->pe_masked = false;
+}
+
+/* Push a dispatch context to the dispatch stack */
+static sdei_dispatch_context_t *push_dispatch(void)
+{
+	sdei_cpu_state_t *state = sdei_get_this_pe_state();
+	sdei_dispatch_context_t *disp_ctx;
+
+	/* Cannot have more than max events */
+	assert(state->stack_top < MAX_EVENT_NESTING);
+
+	disp_ctx = &state->dispatch_stack[state->stack_top];
+	state->stack_top++;
+
+	return disp_ctx;
+}
+
+/* Pop a dispatch context to the dispatch stack */
+static sdei_dispatch_context_t *pop_dispatch(void)
+{
+	sdei_cpu_state_t *state = sdei_get_this_pe_state();
+
+	if (state->stack_top == 0U)
+		return NULL;
+
+	assert(state->stack_top <= MAX_EVENT_NESTING);
+
+	state->stack_top--;
+
+	return &state->dispatch_stack[state->stack_top];
+}
+
+/* Retrieve the context at the top of dispatch stack */
+static sdei_dispatch_context_t *get_outstanding_dispatch(void)
+{
+	sdei_cpu_state_t *state = sdei_get_this_pe_state();
+
+	if (state->stack_top == 0U)
+		return NULL;
+
+	assert(state->stack_top <= MAX_EVENT_NESTING);
+
+	return &state->dispatch_stack[state->stack_top - 1U];
+}
+
+static sdei_dispatch_context_t *save_event_ctx(sdei_ev_map_t *map,
+		void *tgt_ctx)
+{
+	sdei_dispatch_context_t *disp_ctx;
+	const gp_regs_t *tgt_gpregs;
+	const el3_state_t *tgt_el3;
+
+	assert(tgt_ctx != NULL);
+	tgt_gpregs = get_gpregs_ctx(tgt_ctx);
+	tgt_el3 = get_el3state_ctx(tgt_ctx);
+
+	disp_ctx = push_dispatch();
+	assert(disp_ctx != NULL);
+	disp_ctx->map = map;
+
+	/* Save general purpose and exception registers */
+	memcpy(disp_ctx->x, tgt_gpregs, sizeof(disp_ctx->x));
+	disp_ctx->spsr_el3 = read_ctx_reg(tgt_el3, CTX_SPSR_EL3);
+	disp_ctx->elr_el3 = read_ctx_reg(tgt_el3, CTX_ELR_EL3);
+
+	return disp_ctx;
+}
+
+static void restore_event_ctx(const sdei_dispatch_context_t *disp_ctx, void *tgt_ctx)
+{
+	gp_regs_t *tgt_gpregs;
+	el3_state_t *tgt_el3;
+
+	assert(tgt_ctx != NULL);
+	tgt_gpregs = get_gpregs_ctx(tgt_ctx);
+	tgt_el3 = get_el3state_ctx(tgt_ctx);
+
+	CASSERT(sizeof(disp_ctx->x) == (SDEI_SAVED_GPREGS * sizeof(uint64_t)),
+			foo);
+
+	/* Restore general purpose and exception registers */
+	memcpy(tgt_gpregs, disp_ctx->x, sizeof(disp_ctx->x));
+	write_ctx_reg(tgt_el3, CTX_SPSR_EL3, disp_ctx->spsr_el3);
+	write_ctx_reg(tgt_el3, CTX_ELR_EL3, disp_ctx->elr_el3);
+
+#if DYNAMIC_WORKAROUND_CVE_2018_3639
+	cve_2018_3639_t *tgt_cve_2018_3639;
+	tgt_cve_2018_3639 = get_cve_2018_3639_ctx(tgt_ctx);
+
+	/* Restore CVE-2018-3639 mitigation state */
+	write_ctx_reg(tgt_cve_2018_3639, CTX_CVE_2018_3639_DISABLE,
+		disp_ctx->disable_cve_2018_3639);
+#endif
+}
+
+static void save_secure_context(void)
+{
+	cm_el1_sysregs_context_save(SECURE);
+}
+
+/* Restore Secure context and arrange to resume it at the next ERET */
+static void restore_and_resume_secure_context(void)
+{
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+}
+
+/*
+ * Restore Non-secure context and arrange to resume it at the next ERET. Return
+ * pointer to the Non-secure context.
+ */
+static cpu_context_t *restore_and_resume_ns_context(void)
+{
+	cpu_context_t *ns_ctx;
+
+	cm_el1_sysregs_context_restore(NON_SECURE);
+	cm_set_next_eret_context(NON_SECURE);
+
+	ns_ctx = cm_get_context(NON_SECURE);
+	assert(ns_ctx != NULL);
+
+	return ns_ctx;
+}
+
+/*
+ * Prepare for ERET:
+ * - Set the ELR to the registered handler address
+ * - Set the SPSR register as described in the SDEI documentation and
+ *   the AArch64.TakeException() pseudocode function in
+ *   ARM DDI 0487F.c page J1-7635
+ */
+
+static void sdei_set_elr_spsr(sdei_entry_t *se, sdei_dispatch_context_t *disp_ctx)
+{
+	unsigned int client_el = sdei_client_el();
+	u_register_t sdei_spsr = SPSR_64(client_el, MODE_SP_ELX,
+					DISABLE_ALL_EXCEPTIONS);
+
+	u_register_t interrupted_pstate = disp_ctx->spsr_el3;
+
+	/* Check the SPAN bit in the client el SCTLR */
+	u_register_t client_el_sctlr;
+
+	if (client_el == MODE_EL2) {
+		client_el_sctlr = read_sctlr_el2();
+	} else {
+		client_el_sctlr = read_sctlr_el1();
+	}
+
+	/*
+	 * Check whether to force the PAN bit or use the value in the
+	 * interrupted EL according to the check described in
+	 * TakeException. Since the client can only be Non-Secure
+	 * EL2 or El1 some of the conditions in ElIsInHost() we know
+	 * will always be True.
+	 * When the client_el is EL2 we know that there will be a SPAN
+	 * bit in SCTLR_EL2 as we have already checked for the condition
+	 * HCR_EL2.E2H = 1 and HCR_EL2.TGE = 1
+	 */
+	u_register_t hcr_el2 = read_hcr();
+	bool el_is_in_host = is_armv8_1_vhe_present() &&
+			     (hcr_el2 & HCR_TGE_BIT) &&
+			     (hcr_el2 & HCR_E2H_BIT);
+
+	if (is_armv8_1_pan_present() &&
+	    ((client_el == MODE_EL1) ||
+		(client_el == MODE_EL2 && el_is_in_host)) &&
+	    ((client_el_sctlr & SCTLR_SPAN_BIT) == 0U)) {
+		sdei_spsr |=  SPSR_PAN_BIT;
+	} else {
+		sdei_spsr |= (interrupted_pstate & SPSR_PAN_BIT);
+	}
+
+	/* If SSBS is implemented, take the value from the client el SCTLR */
+	u_register_t ssbs_enabled = (read_id_aa64pfr1_el1()
+					>> ID_AA64PFR1_EL1_SSBS_SHIFT)
+					& ID_AA64PFR1_EL1_SSBS_MASK;
+	if (ssbs_enabled != SSBS_UNAVAILABLE) {
+		u_register_t  ssbs_bit = ((client_el_sctlr & SCTLR_DSSBS_BIT)
+						>> SCTLR_DSSBS_SHIFT)
+						<< SPSR_SSBS_SHIFT_AARCH64;
+		sdei_spsr |= ssbs_bit;
+	}
+
+	/* If MTE is implemented in the client el set the TCO bit */
+	if (get_armv8_5_mte_support() >= MTE_IMPLEMENTED_ELX) {
+		sdei_spsr |= SPSR_TCO_BIT_AARCH64;
+	}
+
+	/* Take the DIT field from the pstate of the interrupted el */
+	sdei_spsr |= (interrupted_pstate & SPSR_DIT_BIT);
+
+	cm_set_elr_spsr_el3(NON_SECURE, (uintptr_t) se->ep, sdei_spsr);
+}
+
+/*
+ * Populate the Non-secure context so that the next ERET will dispatch to the
+ * SDEI client.
+ */
+static void setup_ns_dispatch(sdei_ev_map_t *map, sdei_entry_t *se,
+		cpu_context_t *ctx, jmp_buf *dispatch_jmp)
+{
+	sdei_dispatch_context_t *disp_ctx;
+
+	/* Push the event and context */
+	disp_ctx = save_event_ctx(map, ctx);
+
+	/*
+	 * Setup handler arguments:
+	 *
+	 * - x0: Event number
+	 * - x1: Handler argument supplied at the time of event registration
+	 * - x2: Interrupted PC
+	 * - x3: Interrupted SPSR
+	 */
+	SMC_SET_GP(ctx, CTX_GPREG_X0, (uint64_t) map->ev_num);
+	SMC_SET_GP(ctx, CTX_GPREG_X1, se->arg);
+	SMC_SET_GP(ctx, CTX_GPREG_X2, disp_ctx->elr_el3);
+	SMC_SET_GP(ctx, CTX_GPREG_X3, disp_ctx->spsr_el3);
+
+	/* Setup the elr and spsr register to prepare for ERET */
+	sdei_set_elr_spsr(se, disp_ctx);
+
+#if DYNAMIC_WORKAROUND_CVE_2018_3639
+	cve_2018_3639_t *tgt_cve_2018_3639;
+	tgt_cve_2018_3639 = get_cve_2018_3639_ctx(ctx);
+
+	/* Save CVE-2018-3639 mitigation state */
+	disp_ctx->disable_cve_2018_3639 = read_ctx_reg(tgt_cve_2018_3639,
+		CTX_CVE_2018_3639_DISABLE);
+
+	/* Force SDEI handler to execute with mitigation enabled by default */
+	write_ctx_reg(tgt_cve_2018_3639, CTX_CVE_2018_3639_DISABLE, 0);
+#endif
+
+	disp_ctx->dispatch_jmp = dispatch_jmp;
+}
+
+/* Handle a triggered SDEI interrupt while events were masked on this PE */
+static void handle_masked_trigger(sdei_ev_map_t *map, sdei_entry_t *se,
+		sdei_cpu_state_t *state, unsigned int intr_raw)
+{
+	uint64_t my_mpidr __unused = (read_mpidr_el1() & MPIDR_AFFINITY_MASK);
+	bool disable = false;
+
+	/* Nothing to do for event 0 */
+	if (map->ev_num == SDEI_EVENT_0)
+		return;
+
+	/*
+	 * For a private event, or for a shared event specifically routed to
+	 * this CPU, we disable interrupt, leave the interrupt pending, and do
+	 * EOI.
+	 */
+	if (is_event_private(map) || (se->reg_flags == SDEI_REGF_RM_PE))
+		disable = true;
+
+	if (se->reg_flags == SDEI_REGF_RM_PE)
+		assert(se->affinity == my_mpidr);
+
+	if (disable) {
+		plat_ic_disable_interrupt(map->intr);
+		plat_ic_set_interrupt_pending(map->intr);
+		plat_ic_end_of_interrupt(intr_raw);
+		state->pending_enables = true;
+
+		return;
+	}
+
+	/*
+	 * We just received a shared event with routing set to ANY PE. The
+	 * interrupt can't be delegated on this PE as SDEI events are masked.
+	 * However, because its routing mode is ANY, it is possible that the
+	 * event can be delegated on any other PE that hasn't masked events.
+	 * Therefore, we set the interrupt back pending so as to give other
+	 * suitable PEs a chance of handling it.
+	 */
+	assert(plat_ic_is_spi(map->intr) != 0);
+	plat_ic_set_interrupt_pending(map->intr);
+
+	/*
+	 * Leaving the same interrupt pending also means that the same interrupt
+	 * can target this PE again as soon as this PE leaves EL3. Whether and
+	 * how often that happens depends on the implementation of GIC.
+	 *
+	 * We therefore call a platform handler to resolve this situation.
+	 */
+	plat_sdei_handle_masked_trigger(my_mpidr, map->intr);
+
+	/* This PE is masked. We EOI the interrupt, as it can't be delegated */
+	plat_ic_end_of_interrupt(intr_raw);
+}
+
+/* SDEI main interrupt handler */
+int sdei_intr_handler(uint32_t intr_raw, uint32_t flags, void *handle,
+		void *cookie)
+{
+	sdei_entry_t *se;
+	cpu_context_t *ctx;
+	sdei_ev_map_t *map;
+	const sdei_dispatch_context_t *disp_ctx;
+	unsigned int sec_state;
+	sdei_cpu_state_t *state;
+	uint32_t intr;
+	jmp_buf dispatch_jmp;
+	const uint64_t mpidr = read_mpidr_el1();
+
+	/*
+	 * To handle an event, the following conditions must be true:
+	 *
+	 * 1. Event must be signalled
+	 * 2. Event must be enabled
+	 * 3. This PE must be a target PE for the event
+	 * 4. PE must be unmasked for SDEI
+	 * 5. If this is a normal event, no event must be running
+	 * 6. If this is a critical event, no critical event must be running
+	 *
+	 * (1) and (2) are true when this function is running
+	 * (3) is enforced in GIC by selecting the appropriate routing option
+	 * (4) is satisfied by client calling PE_UNMASK
+	 * (5) and (6) is enforced using interrupt priority, the RPR, in GIC:
+	 *   - Normal SDEI events belong to Normal SDE priority class
+	 *   - Critical SDEI events belong to Critical CSDE priority class
+	 *
+	 * The interrupt has already been acknowledged, and therefore is active,
+	 * so no other PE can handle this event while we are at it.
+	 *
+	 * Find if this is an SDEI interrupt. There must be an event mapped to
+	 * this interrupt
+	 */
+	intr = plat_ic_get_interrupt_id(intr_raw);
+	map = find_event_map_by_intr(intr, (plat_ic_is_spi(intr) != 0));
+	if (map == NULL) {
+		ERROR("No SDEI map for interrupt %u\n", intr);
+		panic();
+	}
+
+	/*
+	 * Received interrupt number must either correspond to event 0, or must
+	 * be bound interrupt.
+	 */
+	assert((map->ev_num == SDEI_EVENT_0) || is_map_bound(map));
+
+	se = get_event_entry(map);
+	state = sdei_get_this_pe_state();
+
+	if (state->pe_masked) {
+		/*
+		 * Interrupts received while this PE was masked can't be
+		 * dispatched.
+		 */
+		SDEI_LOG("interrupt %u on %" PRIx64 " while PE masked\n",
+			 map->intr, mpidr);
+		if (is_event_shared(map))
+			sdei_map_lock(map);
+
+		handle_masked_trigger(map, se, state, intr_raw);
+
+		if (is_event_shared(map))
+			sdei_map_unlock(map);
+
+		return 0;
+	}
+
+	/* Insert load barrier for signalled SDEI event */
+	if (map->ev_num == SDEI_EVENT_0)
+		dmbld();
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	/* Assert shared event routed to this PE had been configured so */
+	if (is_event_shared(map) && (se->reg_flags == SDEI_REGF_RM_PE)) {
+		assert(se->affinity == (mpidr & MPIDR_AFFINITY_MASK));
+	}
+
+	if (!can_sdei_state_trans(se, DO_DISPATCH)) {
+		SDEI_LOG("SDEI event 0x%x can't be dispatched; state=0x%x\n",
+				map->ev_num, se->state);
+
+		/*
+		 * If the event is registered, leave the interrupt pending so
+		 * that it's delivered when the event is enabled.
+		 */
+		if (GET_EV_STATE(se, REGISTERED))
+			plat_ic_set_interrupt_pending(map->intr);
+
+		/*
+		 * The interrupt was disabled or unregistered after the handler
+		 * started to execute, which means now the interrupt is already
+		 * disabled and we just need to EOI the interrupt.
+		 */
+		plat_ic_end_of_interrupt(intr_raw);
+
+		if (is_event_shared(map))
+			sdei_map_unlock(map);
+
+		return 0;
+	}
+
+	disp_ctx = get_outstanding_dispatch();
+	if (is_event_critical(map)) {
+		/*
+		 * If this event is Critical, and if there's an outstanding
+		 * dispatch, assert the latter is a Normal dispatch. Critical
+		 * events can preempt an outstanding Normal event dispatch.
+		 */
+		if (disp_ctx != NULL)
+			assert(is_event_normal(disp_ctx->map));
+	} else {
+		/*
+		 * If this event is Normal, assert that there are no outstanding
+		 * dispatches. Normal events can't preempt any outstanding event
+		 * dispatches.
+		 */
+		assert(disp_ctx == NULL);
+	}
+
+	sec_state = get_interrupt_src_ss(flags);
+
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	SDEI_LOG("ACK %" PRIx64 ", ev:0x%x ss:%d spsr:%lx ELR:%lx\n",
+		 mpidr, map->ev_num, sec_state, read_spsr_el3(), read_elr_el3());
+
+	ctx = handle;
+
+	/*
+	 * Check if we interrupted secure state. Perform a context switch so
+	 * that we can delegate to NS.
+	 */
+	if (sec_state == SECURE) {
+		save_secure_context();
+		ctx = restore_and_resume_ns_context();
+	}
+
+	/* Synchronously dispatch event */
+	setup_ns_dispatch(map, se, ctx, &dispatch_jmp);
+	begin_sdei_synchronous_dispatch(&dispatch_jmp);
+
+	/*
+	 * We reach here when client completes the event.
+	 *
+	 * If the cause of dispatch originally interrupted the Secure world,
+	 * resume Secure.
+	 *
+	 * No need to save the Non-secure context ahead of a world switch: the
+	 * Non-secure context was fully saved before dispatch, and has been
+	 * returned to its pre-dispatch state.
+	 */
+	if (sec_state == SECURE)
+		restore_and_resume_secure_context();
+
+	/*
+	 * The event was dispatched after receiving SDEI interrupt. With
+	 * the event handling completed, EOI the corresponding
+	 * interrupt.
+	 */
+	if ((map->ev_num != SDEI_EVENT_0) && !is_map_bound(map)) {
+		ERROR("Invalid SDEI mapping: ev=0x%x\n", map->ev_num);
+		panic();
+	}
+	plat_ic_end_of_interrupt(intr_raw);
+
+	return 0;
+}
+
+/*
+ * Explicitly dispatch the given SDEI event.
+ *
+ * When calling this API, the caller must be prepared for the SDEI dispatcher to
+ * restore and make Non-secure context as active. This call returns only after
+ * the client has completed the dispatch. Then, the Non-secure context will be
+ * active, and the following ERET will return to Non-secure.
+ *
+ * Should the caller require re-entry to Secure, it must restore the Secure
+ * context and program registers for ERET.
+ */
+int sdei_dispatch_event(int ev_num)
+{
+	sdei_entry_t *se;
+	sdei_ev_map_t *map;
+	cpu_context_t *ns_ctx;
+	sdei_dispatch_context_t *disp_ctx;
+	sdei_cpu_state_t *state;
+	jmp_buf dispatch_jmp;
+
+	/* Can't dispatch if events are masked on this PE */
+	state = sdei_get_this_pe_state();
+	if (state->pe_masked)
+		return -1;
+
+	/* Event 0 can't be dispatched */
+	if (ev_num == SDEI_EVENT_0)
+		return -1;
+
+	/* Locate mapping corresponding to this event */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return -1;
+
+	/* Only explicit events can be dispatched */
+	if (!is_map_explicit(map))
+		return -1;
+
+	/* Examine state of dispatch stack */
+	disp_ctx = get_outstanding_dispatch();
+	if (disp_ctx != NULL) {
+		/*
+		 * There's an outstanding dispatch. If the outstanding dispatch
+		 * is critical, no more dispatches are possible.
+		 */
+		if (is_event_critical(disp_ctx->map))
+			return -1;
+
+		/*
+		 * If the outstanding dispatch is Normal, only critical events
+		 * can be dispatched.
+		 */
+		if (is_event_normal(map))
+			return -1;
+	}
+
+	se = get_event_entry(map);
+	if (!can_sdei_state_trans(se, DO_DISPATCH))
+		return -1;
+
+	/*
+	 * Prepare for NS dispatch by restoring the Non-secure context and
+	 * marking that as active.
+	 */
+	ns_ctx = restore_and_resume_ns_context();
+
+	/* Activate the priority corresponding to the event being dispatched */
+	ehf_activate_priority(sdei_event_priority(map));
+
+	/* Dispatch event synchronously */
+	setup_ns_dispatch(map, se, ns_ctx, &dispatch_jmp);
+	begin_sdei_synchronous_dispatch(&dispatch_jmp);
+
+	/*
+	 * We reach here when client completes the event.
+	 *
+	 * Deactivate the priority level that was activated at the time of
+	 * explicit dispatch.
+	 */
+	ehf_deactivate_priority(sdei_event_priority(map));
+
+	return 0;
+}
+
+static void end_sdei_synchronous_dispatch(jmp_buf *buffer)
+{
+	longjmp(*buffer, 1);
+}
+
+int sdei_event_complete(bool resume, uint64_t pc)
+{
+	sdei_dispatch_context_t *disp_ctx;
+	sdei_entry_t *se;
+	sdei_ev_map_t *map;
+	cpu_context_t *ctx;
+	sdei_action_t act;
+	unsigned int client_el = sdei_client_el();
+
+	/* Return error if called without an active event */
+	disp_ctx = get_outstanding_dispatch();
+	if (disp_ctx == NULL)
+		return SDEI_EDENY;
+
+	/* Validate resumption point */
+	if (resume && (plat_sdei_validate_entry_point(pc, client_el) != 0))
+		return SDEI_EDENY;
+
+	map = disp_ctx->map;
+	assert(map != NULL);
+	se = get_event_entry(map);
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	act = resume ? DO_COMPLETE_RESUME : DO_COMPLETE;
+	if (!can_sdei_state_trans(se, act)) {
+		if (is_event_shared(map))
+			sdei_map_unlock(map);
+		return SDEI_EDENY;
+	}
+
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	/* Having done sanity checks, pop dispatch */
+	(void) pop_dispatch();
+
+	SDEI_LOG("EOI:%lx, %d spsr:%lx elr:%lx\n", read_mpidr_el1(),
+			map->ev_num, read_spsr_el3(), read_elr_el3());
+
+	/*
+	 * Restore Non-secure to how it was originally interrupted. Once done,
+	 * it's up-to-date with the saved copy.
+	 */
+	ctx = cm_get_context(NON_SECURE);
+	restore_event_ctx(disp_ctx, ctx);
+
+	if (resume) {
+		/*
+		 * Complete-and-resume call. Prepare the Non-secure context
+		 * (currently active) for complete and resume.
+		 */
+		cm_set_elr_spsr_el3(NON_SECURE, pc, SPSR_64(client_el,
+					MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS));
+
+		/*
+		 * Make it look as if a synchronous exception were taken at the
+		 * supplied Non-secure resumption point. Populate SPSR and
+		 * ELR_ELx so that an ERET from there works as expected.
+		 *
+		 * The assumption is that the client, if necessary, would have
+		 * saved any live content in these registers before making this
+		 * call.
+		 */
+		if (client_el == MODE_EL2) {
+			write_elr_el2(disp_ctx->elr_el3);
+			write_spsr_el2(disp_ctx->spsr_el3);
+		} else {
+			/* EL1 */
+			write_elr_el1(disp_ctx->elr_el3);
+			write_spsr_el1(disp_ctx->spsr_el3);
+		}
+	}
+
+	/* End the outstanding dispatch */
+	end_sdei_synchronous_dispatch(disp_ctx->dispatch_jmp);
+
+	return 0;
+}
+
+int64_t sdei_event_context(void *handle, unsigned int param)
+{
+	sdei_dispatch_context_t *disp_ctx;
+
+	if (param >= SDEI_SAVED_GPREGS)
+		return SDEI_EINVAL;
+
+	/* Get outstanding dispatch on this CPU */
+	disp_ctx = get_outstanding_dispatch();
+	if (disp_ctx == NULL)
+		return SDEI_EDENY;
+
+	assert(disp_ctx->map != NULL);
+
+	if (!can_sdei_state_trans(get_event_entry(disp_ctx->map), DO_CONTEXT))
+		return SDEI_EDENY;
+
+	/*
+	 * No locking is required for the Running status as this is the only CPU
+	 * which can complete the event
+	 */
+
+	return (int64_t) disp_ctx->x[param];
+}
diff --git a/services/std_svc/sdei/sdei_main.c b/services/std_svc/sdei/sdei_main.c
new file mode 100644
index 0000000..44178ed
--- /dev/null
+++ b/services/std_svc/sdei/sdei_main.c
@@ -0,0 +1,1114 @@
+/*
+ * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <bl31/bl31.h>
+#include <bl31/ehf.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <context.h>
+#include <lib/cassert.h>
+#include <lib/el3_runtime/pubsub.h>
+#include <lib/utils.h>
+#include <plat/common/platform.h>
+#include <services/sdei.h>
+
+#include "sdei_private.h"
+
+#define MAJOR_VERSION	1ULL
+#define MINOR_VERSION	0ULL
+#define VENDOR_VERSION	0ULL
+
+#define MAKE_SDEI_VERSION(_major, _minor, _vendor) \
+	((((_major)) << 48ULL) | (((_minor)) << 32ULL) | (_vendor))
+
+#define LOWEST_INTR_PRIORITY		0xff
+
+#define is_valid_affinity(_mpidr)	(plat_core_pos_by_mpidr(_mpidr) >= 0)
+
+CASSERT(PLAT_SDEI_CRITICAL_PRI < PLAT_SDEI_NORMAL_PRI,
+		sdei_critical_must_have_higher_priority);
+
+static unsigned int num_dyn_priv_slots, num_dyn_shrd_slots;
+
+/* Initialise SDEI map entries */
+static void init_map(sdei_ev_map_t *map)
+{
+	map->reg_count = 0;
+}
+
+/* Convert mapping to SDEI class */
+static sdei_class_t map_to_class(sdei_ev_map_t *map)
+{
+	return is_event_critical(map) ? SDEI_CRITICAL : SDEI_NORMAL;
+}
+
+/* Clear SDEI event entries except state */
+static void clear_event_entries(sdei_entry_t *se)
+{
+	se->ep = 0;
+	se->arg = 0;
+	se->affinity = 0;
+	se->reg_flags = 0;
+}
+
+/* Perform CPU-specific state initialisation */
+static void *sdei_cpu_on_init(const void *arg)
+{
+	unsigned int i;
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+
+	/* Initialize private mappings on this CPU */
+	for_each_private_map(i, map) {
+		se = get_event_entry(map);
+		clear_event_entries(se);
+		se->state = 0;
+	}
+
+	SDEI_LOG("Private events initialized on %lx\n", read_mpidr_el1());
+
+	/* All PEs start with SDEI events masked */
+	(void) sdei_pe_mask();
+
+	return NULL;
+}
+
+/* CPU initialisation after wakeup from suspend */
+static void *sdei_cpu_wakeup_init(const void *arg)
+{
+	SDEI_LOG("Events masked on %lx\n", read_mpidr_el1());
+
+	/* All PEs wake up with SDEI events masked */
+	sdei_pe_mask();
+
+	return 0;
+}
+
+/* Initialise an SDEI class */
+static void sdei_class_init(sdei_class_t class)
+{
+	unsigned int i;
+	bool zero_found __unused = false;
+	int ev_num_so_far __unused;
+	sdei_ev_map_t *map;
+
+	/* Sanity check and configuration of shared events */
+	ev_num_so_far = -1;
+	for_each_shared_map(i, map) {
+#if ENABLE_ASSERTIONS
+		/* Ensure mappings are sorted */
+		assert((ev_num_so_far < 0) || (map->ev_num > ev_num_so_far));
+
+		ev_num_so_far = map->ev_num;
+
+		/* Event 0 must not be shared */
+		assert(map->ev_num != SDEI_EVENT_0);
+
+		/* Check for valid event */
+		assert(map->ev_num >= 0);
+
+		/* Make sure it's a shared event */
+		assert(is_event_shared(map));
+
+		/* No shared mapping should have signalable property */
+		assert(!is_event_signalable(map));
+
+		/* Shared mappings can't be explicit */
+		assert(!is_map_explicit(map));
+#endif
+
+		/* Skip initializing the wrong priority */
+		if (map_to_class(map) != class)
+			continue;
+
+		/* Platform events are always bound, so set the bound flag */
+		if (is_map_dynamic(map)) {
+			assert(map->intr == SDEI_DYN_IRQ);
+			assert(is_event_normal(map));
+			num_dyn_shrd_slots++;
+		} else {
+			/* Shared mappings must be bound to shared interrupt */
+			assert(plat_ic_is_spi(map->intr) != 0);
+			set_map_bound(map);
+		}
+
+		init_map(map);
+	}
+
+	/* Sanity check and configuration of private events for this CPU */
+	ev_num_so_far = -1;
+	for_each_private_map(i, map) {
+#if ENABLE_ASSERTIONS
+		/* Ensure mappings are sorted */
+		assert((ev_num_so_far < 0) || (map->ev_num > ev_num_so_far));
+
+		ev_num_so_far = map->ev_num;
+
+		if (map->ev_num == SDEI_EVENT_0) {
+			zero_found = true;
+
+			/* Event 0 must be a Secure SGI */
+			assert(is_secure_sgi(map->intr));
+
+			/*
+			 * Event 0 can have only have signalable flag (apart
+			 * from being private
+			 */
+			assert(map->map_flags == (SDEI_MAPF_SIGNALABLE |
+						SDEI_MAPF_PRIVATE));
+		} else {
+			/* No other mapping should have signalable property */
+			assert(!is_event_signalable(map));
+		}
+
+		/* Check for valid event */
+		assert(map->ev_num >= 0);
+
+		/* Make sure it's a private event */
+		assert(is_event_private(map));
+
+		/*
+		 * Other than priority, explicit events can only have explicit
+		 * and private flags set.
+		 */
+		if (is_map_explicit(map)) {
+			assert((map->map_flags | SDEI_MAPF_CRITICAL) ==
+					(SDEI_MAPF_EXPLICIT | SDEI_MAPF_PRIVATE
+					| SDEI_MAPF_CRITICAL));
+		}
+#endif
+
+		/* Skip initializing the wrong priority */
+		if (map_to_class(map) != class)
+			continue;
+
+		/* Platform events are always bound, so set the bound flag */
+		if (map->ev_num != SDEI_EVENT_0) {
+			if (is_map_dynamic(map)) {
+				assert(map->intr == SDEI_DYN_IRQ);
+				assert(is_event_normal(map));
+				num_dyn_priv_slots++;
+			} else if (is_map_explicit(map)) {
+				/*
+				 * Explicit mappings don't have a backing
+				 * SDEI interrupt, but verify that anyway.
+				 */
+				assert(map->intr == SDEI_DYN_IRQ);
+			} else {
+				/*
+				 * Private mappings must be bound to private
+				 * interrupt.
+				 */
+				assert(plat_ic_is_ppi((unsigned) map->intr) != 0);
+				set_map_bound(map);
+			}
+		}
+
+		init_map(map);
+	}
+
+	/* Ensure event 0 is in the mapping */
+	assert(zero_found);
+
+	(void) sdei_cpu_on_init(NULL);
+}
+
+/* SDEI dispatcher initialisation */
+void sdei_init(void)
+{
+	plat_sdei_setup();
+	sdei_class_init(SDEI_CRITICAL);
+	sdei_class_init(SDEI_NORMAL);
+
+	/* Register priority level handlers */
+	ehf_register_priority_handler(PLAT_SDEI_CRITICAL_PRI,
+			sdei_intr_handler);
+	ehf_register_priority_handler(PLAT_SDEI_NORMAL_PRI,
+			sdei_intr_handler);
+}
+
+/* Populate SDEI event entry */
+static void set_sdei_entry(sdei_entry_t *se, uint64_t ep, uint64_t arg,
+		unsigned int flags, uint64_t affinity)
+{
+	assert(se != NULL);
+
+	se->ep = ep;
+	se->arg = arg;
+	se->affinity = (affinity & MPIDR_AFFINITY_MASK);
+	se->reg_flags = flags;
+}
+
+static uint64_t sdei_version(void)
+{
+	return MAKE_SDEI_VERSION(MAJOR_VERSION, MINOR_VERSION, VENDOR_VERSION);
+}
+
+/* Validate flags and MPIDR values for REGISTER and ROUTING_SET calls */
+static int validate_flags(uint64_t flags, uint64_t mpidr)
+{
+	/* Validate flags */
+	switch (flags) {
+	case SDEI_REGF_RM_PE:
+		if (!is_valid_affinity(mpidr))
+			return SDEI_EINVAL;
+		break;
+	case SDEI_REGF_RM_ANY:
+		break;
+	default:
+		/* Unknown flags */
+		return SDEI_EINVAL;
+	}
+
+	return 0;
+}
+
+/* Set routing of an SDEI event */
+static int sdei_event_routing_set(int ev_num, uint64_t flags, uint64_t mpidr)
+{
+	int ret;
+	unsigned int routing;
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+
+	ret = validate_flags(flags, mpidr);
+	if (ret != 0)
+		return ret;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	/* The event must not be private */
+	if (is_event_private(map))
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+
+	sdei_map_lock(map);
+
+	if (!is_map_bound(map) || is_event_private(map)) {
+		ret = SDEI_EINVAL;
+		goto finish;
+	}
+
+	if (!can_sdei_state_trans(se, DO_ROUTING)) {
+		ret = SDEI_EDENY;
+		goto finish;
+	}
+
+	/* Choose appropriate routing */
+	routing = (unsigned int) ((flags == SDEI_REGF_RM_ANY) ?
+		INTR_ROUTING_MODE_ANY : INTR_ROUTING_MODE_PE);
+
+	/* Update event registration flag */
+	se->reg_flags = (unsigned int) flags;
+	if (flags == SDEI_REGF_RM_PE) {
+		se->affinity = (mpidr & MPIDR_AFFINITY_MASK);
+	}
+
+	/*
+	 * ROUTING_SET is permissible only when event composite state is
+	 * 'registered, disabled, and not running'. This means that the
+	 * interrupt is currently disabled, and not active.
+	 */
+	plat_ic_set_spi_routing(map->intr, routing, (u_register_t) mpidr);
+
+finish:
+	sdei_map_unlock(map);
+
+	return ret;
+}
+
+/* Register handler and argument for an SDEI event */
+static int64_t sdei_event_register(int ev_num,
+				uint64_t ep,
+				uint64_t arg,
+				uint64_t flags,
+				uint64_t mpidr)
+{
+	int ret;
+	unsigned int routing;
+	sdei_entry_t *se;
+	sdei_ev_map_t *map;
+	sdei_state_t backup_state;
+
+	if ((ep == 0U) || (plat_sdei_validate_entry_point(
+					ep, sdei_client_el()) != 0)) {
+		return SDEI_EINVAL;
+	}
+
+	ret = validate_flags(flags, mpidr);
+	if (ret != 0)
+		return ret;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	/* Private events always target the PE */
+	if (is_event_private(map)) {
+		/*
+		 * SDEI internally handles private events in the same manner
+		 * as public events with routing mode=RM_PE, since the routing
+		 * mode flag and affinity fields are not used when registering
+		 * a private event, set them here.
+		 */
+		flags = SDEI_REGF_RM_PE;
+		/*
+		 * Kernel may pass 0 as mpidr, as we set flags to
+		 * SDEI_REGF_RM_PE, so set mpidr also.
+		 */
+		mpidr = read_mpidr_el1();
+	}
+
+	se = get_event_entry(map);
+
+	/*
+	 * Even though register operation is per-event (additionally for private
+	 * events, registration is required individually), it has to be
+	 * serialised with respect to bind/release, which are global operations.
+	 * So we hold the lock throughout, unconditionally.
+	 */
+	sdei_map_lock(map);
+
+	backup_state = se->state;
+	if (!can_sdei_state_trans(se, DO_REGISTER))
+		goto fallback;
+
+	/*
+	 * When registering for dynamic events, make sure it's been bound
+	 * already. This has to be the case as, without binding, the client
+	 * can't know about the event number to register for.
+	 */
+	if (is_map_dynamic(map) && !is_map_bound(map))
+		goto fallback;
+
+	if (is_event_private(map)) {
+		/* Multiple calls to register are possible for private events */
+		assert(map->reg_count >= 0);
+	} else {
+		/* Only single call to register is possible for shared events */
+		assert(map->reg_count == 0);
+	}
+
+	if (is_map_bound(map)) {
+		/* Meanwhile, did any PE ACK the interrupt? */
+		if (plat_ic_get_interrupt_active(map->intr) != 0U)
+			goto fallback;
+
+		/* The interrupt must currently owned by Non-secure */
+		if (plat_ic_get_interrupt_type(map->intr) != INTR_TYPE_NS)
+			goto fallback;
+
+		/*
+		 * Disable forwarding of new interrupt triggers to CPU
+		 * interface.
+		 */
+		plat_ic_disable_interrupt(map->intr);
+
+		/*
+		 * Any events that are triggered after register and before
+		 * enable should remain pending. Clear any previous interrupt
+		 * triggers which are pending (except for SGIs). This has no
+		 * affect on level-triggered interrupts.
+		 */
+		if (ev_num != SDEI_EVENT_0)
+			plat_ic_clear_interrupt_pending(map->intr);
+
+		/* Map interrupt to EL3 and program the correct priority */
+		plat_ic_set_interrupt_type(map->intr, INTR_TYPE_EL3);
+
+		/* Program the appropriate interrupt priority */
+		plat_ic_set_interrupt_priority(map->intr, sdei_event_priority(map));
+
+		/*
+		 * Set the routing mode for shared event as requested. We
+		 * already ensure that shared events get bound to SPIs.
+		 */
+		if (is_event_shared(map)) {
+			routing = (unsigned int) ((flags == SDEI_REGF_RM_ANY) ?
+				INTR_ROUTING_MODE_ANY : INTR_ROUTING_MODE_PE);
+			plat_ic_set_spi_routing(map->intr, routing,
+					(u_register_t) mpidr);
+		}
+	}
+
+	/* Populate event entries */
+	set_sdei_entry(se, ep, arg, (unsigned int) flags, mpidr);
+
+	/* Increment register count */
+	map->reg_count++;
+
+	sdei_map_unlock(map);
+
+	return 0;
+
+fallback:
+	/* Reinstate previous state */
+	se->state = backup_state;
+
+	sdei_map_unlock(map);
+
+	return SDEI_EDENY;
+}
+
+/* Enable SDEI event */
+static int64_t sdei_event_enable(int ev_num)
+{
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+	int ret;
+	bool before, after;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+	ret = SDEI_EDENY;
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	before = GET_EV_STATE(se, ENABLED);
+	if (!can_sdei_state_trans(se, DO_ENABLE))
+		goto finish;
+	after = GET_EV_STATE(se, ENABLED);
+
+	/*
+	 * Enable interrupt for bound events only if there's a change in enabled
+	 * state.
+	 */
+	if (is_map_bound(map) && (!before && after))
+		plat_ic_enable_interrupt(map->intr);
+
+	ret = 0;
+
+finish:
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	return ret;
+}
+
+/* Disable SDEI event */
+static int sdei_event_disable(int ev_num)
+{
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+	int ret;
+	bool before, after;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+	ret = SDEI_EDENY;
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	before = GET_EV_STATE(se, ENABLED);
+	if (!can_sdei_state_trans(se, DO_DISABLE))
+		goto finish;
+	after = GET_EV_STATE(se, ENABLED);
+
+	/*
+	 * Disable interrupt for bound events only if there's a change in
+	 * enabled state.
+	 */
+	if (is_map_bound(map) && (before && !after))
+		plat_ic_disable_interrupt(map->intr);
+
+	ret = 0;
+
+finish:
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	return ret;
+}
+
+/* Query SDEI event information */
+static int64_t sdei_event_get_info(int ev_num, int info)
+{
+	sdei_entry_t *se;
+	sdei_ev_map_t *map;
+
+	uint64_t flags;
+	bool registered;
+	uint64_t affinity;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	/* Sample state under lock */
+	registered = GET_EV_STATE(se, REGISTERED);
+	flags = se->reg_flags;
+	affinity = se->affinity;
+
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	switch (info) {
+	case SDEI_INFO_EV_TYPE:
+		return is_event_shared(map);
+
+	case SDEI_INFO_EV_NOT_SIGNALED:
+		return !is_event_signalable(map);
+
+	case SDEI_INFO_EV_PRIORITY:
+		return is_event_critical(map);
+
+	case SDEI_INFO_EV_ROUTING_MODE:
+		if (!is_event_shared(map))
+			return SDEI_EINVAL;
+		if (!registered)
+			return SDEI_EDENY;
+		return (flags == SDEI_REGF_RM_PE);
+
+	case SDEI_INFO_EV_ROUTING_AFF:
+		if (!is_event_shared(map))
+			return SDEI_EINVAL;
+		if (!registered)
+			return SDEI_EDENY;
+		if (flags != SDEI_REGF_RM_PE)
+			return SDEI_EINVAL;
+		return affinity;
+
+	default:
+		return SDEI_EINVAL;
+	}
+}
+
+/* Unregister an SDEI event */
+static int sdei_event_unregister(int ev_num)
+{
+	int ret = 0;
+	sdei_entry_t *se;
+	sdei_ev_map_t *map;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+
+	/*
+	 * Even though unregister operation is per-event (additionally for
+	 * private events, unregistration is required individually), it has to
+	 * be serialised with respect to bind/release, which are global
+	 * operations.  So we hold the lock throughout, unconditionally.
+	 */
+	sdei_map_lock(map);
+
+	if (!can_sdei_state_trans(se, DO_UNREGISTER)) {
+		/*
+		 * Even if the call is invalid, and the handler is running (for
+		 * example, having unregistered from a running handler earlier),
+		 * return pending error code; otherwise, return deny.
+		 */
+		ret = GET_EV_STATE(se, RUNNING) ? SDEI_EPEND : SDEI_EDENY;
+
+		goto finish;
+	}
+
+	map->reg_count--;
+	if (is_event_private(map)) {
+		/* Multiple calls to register are possible for private events */
+		assert(map->reg_count >= 0);
+	} else {
+		/* Only single call to register is possible for shared events */
+		assert(map->reg_count == 0);
+	}
+
+	if (is_map_bound(map)) {
+		plat_ic_disable_interrupt(map->intr);
+
+		/*
+		 * Clear pending interrupt. Skip for SGIs as they may not be
+		 * cleared on interrupt controllers.
+		 */
+		if (ev_num != SDEI_EVENT_0)
+			plat_ic_clear_interrupt_pending(map->intr);
+
+		assert(plat_ic_get_interrupt_type(map->intr) == INTR_TYPE_EL3);
+		plat_ic_set_interrupt_type(map->intr, INTR_TYPE_NS);
+		plat_ic_set_interrupt_priority(map->intr, LOWEST_INTR_PRIORITY);
+	}
+
+	clear_event_entries(se);
+
+	/*
+	 * If the handler is running at the time of unregister, return the
+	 * pending error code.
+	 */
+	if (GET_EV_STATE(se, RUNNING))
+		ret = SDEI_EPEND;
+
+finish:
+	sdei_map_unlock(map);
+
+	return ret;
+}
+
+/* Query status of an SDEI event */
+static int sdei_event_status(int ev_num)
+{
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+	sdei_state_t state;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+
+	if (is_event_shared(map))
+		sdei_map_lock(map);
+
+	/* State value directly maps to the expected return format */
+	state = se->state;
+
+	if (is_event_shared(map))
+		sdei_map_unlock(map);
+
+	return (int) state;
+}
+
+/* Bind an SDEI event to an interrupt */
+static int sdei_interrupt_bind(unsigned int intr_num)
+{
+	sdei_ev_map_t *map;
+	bool retry = true, shared_mapping;
+
+	/* SGIs are not allowed to be bound */
+	if (plat_ic_is_sgi(intr_num) != 0)
+		return SDEI_EINVAL;
+
+	shared_mapping = (plat_ic_is_spi(intr_num) != 0);
+	do {
+		/*
+		 * Bail out if there is already an event for this interrupt,
+		 * either platform-defined or dynamic.
+		 */
+		map = find_event_map_by_intr(intr_num, shared_mapping);
+		if (map != NULL) {
+			if (is_map_dynamic(map)) {
+				if (is_map_bound(map)) {
+					/*
+					 * Dynamic event, already bound. Return
+					 * event number.
+					 */
+					return map->ev_num;
+				}
+			} else {
+				/* Binding non-dynamic event */
+				return SDEI_EINVAL;
+			}
+		}
+
+		/*
+		 * The interrupt is not bound yet. Try to find a free slot to
+		 * bind it. Free dynamic mappings have their interrupt set as
+		 * SDEI_DYN_IRQ.
+		 */
+		map = find_event_map_by_intr(SDEI_DYN_IRQ, shared_mapping);
+		if (map == NULL)
+			return SDEI_ENOMEM;
+
+		/* The returned mapping must be dynamic */
+		assert(is_map_dynamic(map));
+
+		/*
+		 * We cannot assert for bound maps here, as we might be racing
+		 * with another bind.
+		 */
+
+		/* The requested interrupt must already belong to NS */
+		if (plat_ic_get_interrupt_type(intr_num) != INTR_TYPE_NS)
+			return SDEI_EDENY;
+
+		/*
+		 * Interrupt programming and ownership transfer are deferred
+		 * until register.
+		 */
+
+		sdei_map_lock(map);
+		if (!is_map_bound(map)) {
+			map->intr = intr_num;
+			set_map_bound(map);
+			retry = false;
+		}
+		sdei_map_unlock(map);
+	} while (retry);
+
+	return map->ev_num;
+}
+
+/* Release a bound SDEI event previously to an interrupt */
+static int sdei_interrupt_release(int ev_num)
+{
+	int ret = 0;
+	sdei_ev_map_t *map;
+	sdei_entry_t *se;
+
+	/* Check if valid event number */
+	map = find_event_map(ev_num);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	if (!is_map_dynamic(map))
+		return SDEI_EINVAL;
+
+	se = get_event_entry(map);
+
+	sdei_map_lock(map);
+
+	/* Event must have been unregistered before release */
+	if (map->reg_count != 0) {
+		ret = SDEI_EDENY;
+		goto finish;
+	}
+
+	/*
+	 * Interrupt release never causes the state to change. We only check
+	 * whether it's permissible or not.
+	 */
+	if (!can_sdei_state_trans(se, DO_RELEASE)) {
+		ret = SDEI_EDENY;
+		goto finish;
+	}
+
+	if (is_map_bound(map)) {
+		/*
+		 * Deny release if the interrupt is active, which means it's
+		 * probably being acknowledged and handled elsewhere.
+		 */
+		if (plat_ic_get_interrupt_active(map->intr) != 0U) {
+			ret = SDEI_EDENY;
+			goto finish;
+		}
+
+		/*
+		 * Interrupt programming and ownership transfer are already done
+		 * during unregister.
+		 */
+
+		map->intr = SDEI_DYN_IRQ;
+		clr_map_bound(map);
+	} else {
+		SDEI_LOG("Error release bound:%d cnt:%d\n", is_map_bound(map),
+				map->reg_count);
+		ret = SDEI_EINVAL;
+	}
+
+finish:
+	sdei_map_unlock(map);
+
+	return ret;
+}
+
+/* Perform reset of private SDEI events */
+static int sdei_private_reset(void)
+{
+	sdei_ev_map_t *map;
+	int ret = 0, final_ret = 0;
+	unsigned int i;
+
+	/* Unregister all private events */
+	for_each_private_map(i, map) {
+		/*
+		 * The unregister can fail if the event is not registered, which
+		 * is allowed, and a deny will be returned. But if the event is
+		 * running or unregister pending, the call fails.
+		 */
+		ret = sdei_event_unregister(map->ev_num);
+		if ((ret == SDEI_EPEND) && (final_ret == 0))
+			final_ret = SDEI_EDENY;
+	}
+
+	return final_ret;
+}
+
+/* Perform reset of shared SDEI events */
+static int sdei_shared_reset(void)
+{
+	const sdei_mapping_t *mapping;
+	sdei_ev_map_t *map;
+	int ret = 0, final_ret = 0;
+	unsigned int i, j;
+
+	/* Unregister all shared events */
+	for_each_shared_map(i, map) {
+		/*
+		 * The unregister can fail if the event is not registered, which
+		 * is allowed, and a deny will be returned. But if the event is
+		 * running or unregister pending, the call fails.
+		 */
+		ret = sdei_event_unregister(map->ev_num);
+		if ((ret == SDEI_EPEND) && (final_ret == 0))
+			final_ret = SDEI_EDENY;
+	}
+
+	if (final_ret != 0)
+		return final_ret;
+
+	/*
+	 * Loop through both private and shared mappings, and release all
+	 * bindings.
+	 */
+	for_each_mapping_type(i, mapping) {
+		iterate_mapping(mapping, j, map) {
+			/*
+			 * Release bindings for mappings that are dynamic and
+			 * bound.
+			 */
+			if (is_map_dynamic(map) && is_map_bound(map)) {
+				/*
+				 * Any failure to release would mean there is at
+				 * least a PE registered for the event.
+				 */
+				ret = sdei_interrupt_release(map->ev_num);
+				if ((ret != 0) && (final_ret == 0))
+					final_ret = ret;
+			}
+		}
+	}
+
+	return final_ret;
+}
+
+/* Send a signal to another SDEI client PE */
+static int sdei_signal(int ev_num, uint64_t target_pe)
+{
+	sdei_ev_map_t *map;
+
+	/* Only event 0 can be signalled */
+	if (ev_num != SDEI_EVENT_0)
+		return SDEI_EINVAL;
+
+	/* Find mapping for event 0 */
+	map = find_event_map(SDEI_EVENT_0);
+	if (map == NULL)
+		return SDEI_EINVAL;
+
+	/* The event must be signalable */
+	if (!is_event_signalable(map))
+		return SDEI_EINVAL;
+
+	/* Validate target */
+	if (plat_core_pos_by_mpidr(target_pe) < 0)
+		return SDEI_EINVAL;
+
+	/* Raise SGI. Platform will validate target_pe */
+	plat_ic_raise_el3_sgi((int) map->intr, (u_register_t) target_pe);
+
+	return 0;
+}
+
+/* Query SDEI dispatcher features */
+static uint64_t sdei_features(unsigned int feature)
+{
+	if (feature == SDEI_FEATURE_BIND_SLOTS) {
+		return FEATURE_BIND_SLOTS(num_dyn_priv_slots,
+				num_dyn_shrd_slots);
+	}
+
+	return (uint64_t) SDEI_EINVAL;
+}
+
+/* SDEI top level handler for servicing SMCs */
+uint64_t sdei_smc_handler(uint32_t smc_fid,
+			  uint64_t x1,
+			  uint64_t x2,
+			  uint64_t x3,
+			  uint64_t x4,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+
+	uint64_t x5;
+	unsigned int ss = (unsigned int) get_interrupt_src_ss(flags);
+	int64_t ret;
+	bool resume = false;
+	cpu_context_t *ctx = handle;
+	int ev_num = (int) x1;
+
+	if (ss != NON_SECURE)
+		SMC_RET1(ctx, SMC_UNK);
+
+	/* Verify the caller EL */
+	if (GET_EL(read_spsr_el3()) != sdei_client_el())
+		SMC_RET1(ctx, SMC_UNK);
+
+	switch (smc_fid) {
+	case SDEI_VERSION:
+		SDEI_LOG("> VER\n");
+		ret = (int64_t) sdei_version();
+		SDEI_LOG("< VER:%" PRIx64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_REGISTER:
+		x5 = SMC_GET_GP(ctx, CTX_GPREG_X5);
+		SDEI_LOG("> REG(n:%d e:%" PRIx64 " a:%" PRIx64 " f:%x m:%" PRIx64 "\n", ev_num,
+				x2, x3, (int) x4, x5);
+		ret = sdei_event_register(ev_num, x2, x3, x4, x5);
+		SDEI_LOG("< REG:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_ENABLE:
+		SDEI_LOG("> ENABLE(n:%d)\n", (int) x1);
+		ret = sdei_event_enable(ev_num);
+		SDEI_LOG("< ENABLE:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_DISABLE:
+		SDEI_LOG("> DISABLE(n:0x%x)\n", ev_num);
+		ret = sdei_event_disable(ev_num);
+		SDEI_LOG("< DISABLE:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_CONTEXT:
+		SDEI_LOG("> CTX(p:%d):%lx\n", (int) x1, read_mpidr_el1());
+		ret = sdei_event_context(ctx, (unsigned int) x1);
+		SDEI_LOG("< CTX:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_COMPLETE_AND_RESUME:
+		resume = true;
+		/* Fallthrough */
+
+	case SDEI_EVENT_COMPLETE:
+		SDEI_LOG("> COMPLETE(r:%u sta/ep:%" PRIx64 "):%lx\n",
+			 (unsigned int) resume, x1, read_mpidr_el1());
+		ret = sdei_event_complete(resume, x1);
+		SDEI_LOG("< COMPLETE:%" PRIx64 "\n", ret);
+
+		/*
+		 * Set error code only if the call failed. If the call
+		 * succeeded, we discard the dispatched context, and restore the
+		 * interrupted context to a pristine condition, and therefore
+		 * shouldn't be modified. We don't return to the caller in this
+		 * case anyway.
+		 */
+		if (ret != 0)
+			SMC_RET1(ctx, ret);
+
+		SMC_RET0(ctx);
+
+	case SDEI_EVENT_STATUS:
+		SDEI_LOG("> STAT(n:0x%x)\n", ev_num);
+		ret = sdei_event_status(ev_num);
+		SDEI_LOG("< STAT:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_GET_INFO:
+		SDEI_LOG("> INFO(n:0x%x, %d)\n", ev_num, (int) x2);
+		ret = sdei_event_get_info(ev_num, (int) x2);
+		SDEI_LOG("< INFO:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_UNREGISTER:
+		SDEI_LOG("> UNREG(n:0x%x)\n", ev_num);
+		ret = sdei_event_unregister(ev_num);
+		SDEI_LOG("< UNREG:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_PE_UNMASK:
+		SDEI_LOG("> UNMASK:%lx\n", read_mpidr_el1());
+		sdei_pe_unmask();
+		SDEI_LOG("< UNMASK:%d\n", 0);
+		SMC_RET1(ctx, 0);
+
+	case SDEI_PE_MASK:
+		SDEI_LOG("> MASK:%lx\n", read_mpidr_el1());
+		ret = sdei_pe_mask();
+		SDEI_LOG("< MASK:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_INTERRUPT_BIND:
+		SDEI_LOG("> BIND(%d)\n", (int) x1);
+		ret = sdei_interrupt_bind((unsigned int) x1);
+		SDEI_LOG("< BIND:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_INTERRUPT_RELEASE:
+		SDEI_LOG("> REL(0x%x)\n", ev_num);
+		ret = sdei_interrupt_release(ev_num);
+		SDEI_LOG("< REL:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_SHARED_RESET:
+		SDEI_LOG("> S_RESET():%lx\n", read_mpidr_el1());
+		ret = sdei_shared_reset();
+		SDEI_LOG("< S_RESET:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_PRIVATE_RESET:
+		SDEI_LOG("> P_RESET():%lx\n", read_mpidr_el1());
+		ret = sdei_private_reset();
+		SDEI_LOG("< P_RESET:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_ROUTING_SET:
+		SDEI_LOG("> ROUTE_SET(n:%d f:%" PRIx64 " aff:%" PRIx64 ")\n", ev_num, x2, x3);
+		ret = sdei_event_routing_set(ev_num, x2, x3);
+		SDEI_LOG("< ROUTE_SET:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_FEATURES:
+		SDEI_LOG("> FTRS(f:%" PRIx64 ")\n", x1);
+		ret = (int64_t) sdei_features((unsigned int) x1);
+		SDEI_LOG("< FTRS:%" PRIx64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	case SDEI_EVENT_SIGNAL:
+		SDEI_LOG("> SIGNAL(e:%d t:%" PRIx64 ")\n", ev_num, x2);
+		ret = sdei_signal(ev_num, x2);
+		SDEI_LOG("< SIGNAL:%" PRId64 "\n", ret);
+		SMC_RET1(ctx, ret);
+
+	default:
+		/* Do nothing in default case */
+		break;
+	}
+
+	WARN("Unimplemented SDEI Call: 0x%x\n", smc_fid);
+	SMC_RET1(ctx, SMC_UNK);
+}
+
+/* Subscribe to PSCI CPU on to initialize per-CPU SDEI configuration */
+SUBSCRIBE_TO_EVENT(psci_cpu_on_finish, sdei_cpu_on_init);
+
+/* Subscribe to PSCI CPU suspend finisher for per-CPU configuration */
+SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_finish, sdei_cpu_wakeup_init);
diff --git a/services/std_svc/sdei/sdei_private.h b/services/std_svc/sdei/sdei_private.h
new file mode 100644
index 0000000..44a7301
--- /dev/null
+++ b/services/std_svc/sdei/sdei_private.h
@@ -0,0 +1,248 @@
+/*
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SDEI_PRIVATE_H
+#define SDEI_PRIVATE_H
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <arch_helpers.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/debug.h>
+#include <context.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/spinlock.h>
+#include <lib/utils_def.h>
+#include <plat/common/platform.h>
+#include <services/sdei.h>
+#include <setjmp.h>
+
+#ifndef __aarch64__
+# error SDEI is implemented only for AArch64 systems
+#endif
+
+#ifndef PLAT_SDEI_CRITICAL_PRI
+# error Platform must define SDEI critical priority value
+#endif
+
+#ifndef PLAT_SDEI_NORMAL_PRI
+# error Platform must define SDEI normal priority value
+#endif
+
+/* Output SDEI logs as verbose */
+#define SDEI_LOG(...)	VERBOSE("SDEI: " __VA_ARGS__)
+
+/* SDEI handler unregistered state. This is the default state. */
+#define SDEI_STATE_UNREGISTERED		0U
+
+/* SDE event status values in bit position */
+#define SDEI_STATF_REGISTERED		0U
+#define SDEI_STATF_ENABLED		1U
+#define SDEI_STATF_RUNNING		2U
+
+/* SDEI SMC error codes */
+#define	SDEI_EINVAL	(-2)
+#define	SDEI_EDENY	(-3)
+#define	SDEI_EPEND	(-5)
+#define	SDEI_ENOMEM	(-10)
+
+/*
+ * 'info' parameter to SDEI_EVENT_GET_INFO SMC.
+ *
+ * Note that the SDEI v1.0 specification mistakenly enumerates the
+ * SDEI_INFO_EV_SIGNALED as SDEI_INFO_SIGNALED. This will be corrected in a
+ * future version.
+ */
+#define SDEI_INFO_EV_TYPE		0
+#define SDEI_INFO_EV_NOT_SIGNALED	1
+#define SDEI_INFO_EV_PRIORITY		2
+#define SDEI_INFO_EV_ROUTING_MODE	3
+#define SDEI_INFO_EV_ROUTING_AFF	4
+
+#define SDEI_PRIVATE_MAPPING()	(&sdei_global_mappings[SDEI_MAP_IDX_PRIV_])
+#define SDEI_SHARED_MAPPING()	(&sdei_global_mappings[SDEI_MAP_IDX_SHRD_])
+
+#define for_each_mapping_type(_i, _mapping) \
+	for ((_i) = 0, (_mapping) = &sdei_global_mappings[(_i)]; \
+			(_i) < SDEI_MAP_IDX_MAX_; \
+			(_i)++, (_mapping) = &sdei_global_mappings[(_i)])
+
+#define iterate_mapping(_mapping, _i, _map) \
+	for ((_map) = (_mapping)->map, (_i) = 0; \
+			(_i) < (_mapping)->num_maps; \
+			(_i)++, (_map)++)
+
+#define for_each_private_map(_i, _map) \
+	iterate_mapping(SDEI_PRIVATE_MAPPING(), _i, _map)
+
+#define for_each_shared_map(_i, _map) \
+	iterate_mapping(SDEI_SHARED_MAPPING(), _i, _map)
+
+/* SDEI_FEATURES */
+#define SDEI_FEATURE_BIND_SLOTS		0U
+#define BIND_SLOTS_MASK			0xffffU
+#define FEATURES_SHARED_SLOTS_SHIFT	16U
+#define FEATURES_PRIVATE_SLOTS_SHIFT	0U
+#define FEATURE_BIND_SLOTS(_priv, _shrd) \
+	(((((uint64_t) (_priv)) & BIND_SLOTS_MASK) << FEATURES_PRIVATE_SLOTS_SHIFT) | \
+	 ((((uint64_t) (_shrd)) & BIND_SLOTS_MASK) << FEATURES_SHARED_SLOTS_SHIFT))
+
+#define GET_EV_STATE(_e, _s)	get_ev_state_bit(_e, SDEI_STATF_##_s)
+#define SET_EV_STATE(_e, _s)	clr_ev_state_bit(_e->state, SDEI_STATF_##_s)
+
+static inline bool is_event_private(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_PRIVATE_SHIFT_)) != 0U);
+}
+
+static inline bool is_event_shared(sdei_ev_map_t *map)
+{
+	return !is_event_private(map);
+}
+
+static inline bool is_event_critical(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_CRITICAL_SHIFT_)) != 0U);
+}
+
+static inline bool is_event_normal(sdei_ev_map_t *map)
+{
+	return !is_event_critical(map);
+}
+
+static inline bool is_event_signalable(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_SIGNALABLE_SHIFT_)) != 0U);
+}
+
+static inline bool is_map_dynamic(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_DYNAMIC_SHIFT_)) != 0U);
+}
+
+/*
+ * Checks whether an event is associated with an interrupt. Static events always
+ * return true, and dynamic events return whether SDEI_INTERRUPT_BIND had been
+ * called on them. This can be used on both static or dynamic events to check
+ * for an associated interrupt.
+ */
+static inline bool is_map_bound(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_BOUND_SHIFT_)) != 0U);
+}
+
+static inline void set_map_bound(sdei_ev_map_t *map)
+{
+	map->map_flags |= BIT_32(SDEI_MAPF_BOUND_SHIFT_);
+}
+
+static inline bool is_map_explicit(sdei_ev_map_t *map)
+{
+	return ((map->map_flags & BIT_32(SDEI_MAPF_EXPLICIT_SHIFT_)) != 0U);
+}
+
+static inline void clr_map_bound(sdei_ev_map_t *map)
+{
+	map->map_flags &= ~BIT_32(SDEI_MAPF_BOUND_SHIFT_);
+}
+
+static inline bool is_secure_sgi(unsigned int intr)
+{
+	return ((plat_ic_is_sgi(intr) != 0) &&
+			(plat_ic_get_interrupt_type(intr) == INTR_TYPE_EL3));
+}
+
+/*
+ * Determine EL of the client. If EL2 is implemented (hence the enabled HCE
+ * bit), deem EL2; otherwise, deem EL1.
+ */
+static inline unsigned int sdei_client_el(void)
+{
+	cpu_context_t *ns_ctx = cm_get_context(NON_SECURE);
+	el3_state_t *el3_ctx = get_el3state_ctx(ns_ctx);
+
+	return ((read_ctx_reg(el3_ctx, CTX_SCR_EL3) & SCR_HCE_BIT) != 0U) ?
+		MODE_EL2 : MODE_EL1;
+}
+
+static inline unsigned int sdei_event_priority(sdei_ev_map_t *map)
+{
+	return (unsigned int) (is_event_critical(map) ? PLAT_SDEI_CRITICAL_PRI :
+			PLAT_SDEI_NORMAL_PRI);
+}
+
+static inline bool get_ev_state_bit(sdei_entry_t *se, unsigned int bit_no)
+{
+	return ((se->state & BIT_32(bit_no)) != 0U);
+}
+
+static inline void clr_ev_state_bit(sdei_entry_t *se, unsigned int bit_no)
+{
+	se->state &= ~BIT_32(bit_no);
+}
+
+/* SDEI actions for state transition */
+typedef enum {
+	/*
+	 * Actions resulting from client requests. These directly map to SMC
+	 * calls. Note that the state table columns are listed in this order
+	 * too.
+	 */
+	DO_REGISTER = 0,
+	DO_RELEASE = 1,
+	DO_ENABLE = 2,
+	DO_DISABLE = 3,
+	DO_UNREGISTER = 4,
+	DO_ROUTING = 5,
+	DO_CONTEXT = 6,
+	DO_COMPLETE = 7,
+	DO_COMPLETE_RESUME = 8,
+
+	/* Action for event dispatch */
+	DO_DISPATCH = 9,
+
+	DO_MAX,
+} sdei_action_t;
+
+typedef enum {
+	SDEI_NORMAL,
+	SDEI_CRITICAL
+} sdei_class_t;
+
+static inline void sdei_map_lock(sdei_ev_map_t *map)
+{
+	spin_lock(&map->lock);
+}
+
+static inline void sdei_map_unlock(sdei_ev_map_t *map)
+{
+	spin_unlock(&map->lock);
+}
+
+extern const sdei_mapping_t sdei_global_mappings[];
+extern sdei_entry_t sdei_private_event_table[];
+extern sdei_entry_t sdei_shared_event_table[];
+
+void init_sdei_state(void);
+
+sdei_ev_map_t *find_event_map_by_intr(unsigned int intr_num, bool shared);
+sdei_ev_map_t *find_event_map(int ev_num);
+sdei_entry_t *get_event_entry(sdei_ev_map_t *map);
+
+int64_t sdei_event_context(void *handle, unsigned int param);
+int sdei_event_complete(bool resume, uint64_t pc);
+
+void sdei_pe_unmask(void);
+int64_t sdei_pe_mask(void);
+
+int sdei_intr_handler(uint32_t intr_raw, uint32_t flags, void *handle,
+		void *cookie);
+bool can_sdei_state_trans(sdei_entry_t *se, sdei_action_t act);
+void begin_sdei_synchronous_dispatch(jmp_buf *buffer);
+
+#endif /* SDEI_PRIVATE_H */
diff --git a/services/std_svc/sdei/sdei_state.c b/services/std_svc/sdei/sdei_state.c
new file mode 100644
index 0000000..1b448e6
--- /dev/null
+++ b/services/std_svc/sdei/sdei_state.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+
+#include <lib/cassert.h>
+
+#include "sdei_private.h"
+
+/* Aliases for SDEI handler states: 'R'unning, 'E'nabled, and re'G'istered */
+#define r_		0U
+#define R_		(1u << SDEI_STATF_RUNNING)
+
+#define e_		0U
+#define E_		(1u << SDEI_STATF_ENABLED)
+
+#define g_		0U
+#define G_		(1u << SDEI_STATF_REGISTERED)
+
+/* All possible composite handler states */
+#define reg_		(r_ | e_ | g_)
+#define reG_		(r_ | e_ | G_)
+#define rEg_		(r_ | E_ | g_)
+#define rEG_		(r_ | E_ | G_)
+#define Reg_		(R_ | e_ | g_)
+#define ReG_		(R_ | e_ | G_)
+#define REg_		(R_ | E_ | g_)
+#define REG_		(R_ | E_ | G_)
+
+#define MAX_STATES	(REG_ + 1u)
+
+/* Invalid state */
+#define	SDEI_STATE_INVALID	((sdei_state_t) (-1))
+
+/* No change in state */
+#define	SDEI_STATE_NOP		((sdei_state_t) (-2))
+
+#define X___		SDEI_STATE_INVALID
+#define NOP_		SDEI_STATE_NOP
+
+/* Ensure special states don't overlap with valid ones */
+CASSERT(X___ > REG_, sdei_state_overlap_invalid);
+CASSERT(NOP_ > REG_, sdei_state_overlap_nop);
+
+/*
+ * SDEI handler state machine: refer to sections 6.1 and 6.1.2 of the SDEI v1.0
+ * specification (ARM DEN0054A).
+ *
+ * Not all calls contribute to handler state transition. This table is also used
+ * to validate whether a call is permissible at a given handler state:
+ *
+ *  - X___ denotes a forbidden transition;
+ *  - NOP_ denotes a permitted transition, but there's no change in state;
+ *  - Otherwise, XXX_ gives the new state.
+ *
+ * DISP[atch] is a transition added for the implementation, but is not mentioned
+ * in the spec.
+ *
+ * Those calls that the spec mentions as can be made any time don't picture in
+ * this table.
+ */
+
+static const sdei_state_t sdei_state_table[MAX_STATES][DO_MAX] = {
+/*
+ *	Action:		REG     REL	ENA	DISA	UREG	ROUT	CTX	COMP	COMPR	DISP
+ *	Notes:			[3]			[1]	[3]	[3][4]			[2]
+ */
+	/* Handler unregistered, disabled, and not running. This is the default state. */
+/* 0 */	[reg_] = {	reG_,	NOP_,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	},
+
+	/* Handler unregistered and running */
+/* 4 */	[Reg_] = {	X___,	X___,	X___,	X___,	X___,	X___,	NOP_,	reg_,	reg_,	X___,	},
+
+	/* Handler registered */
+/* 1 */	[reG_] = {	X___,	X___,	rEG_,	NOP_,	reg_,	NOP_,	X___,	X___,	X___,	X___,	},
+
+	/* Handler registered and running */
+/* 5 */	[ReG_] = {	X___,	X___,	REG_,	NOP_,	Reg_,	X___,	NOP_,	reG_,	reG_,	X___,	},
+
+	/* Handler registered and enabled */
+/* 3 */	[rEG_] = {	X___,	X___,	NOP_,	reG_,	reg_,	X___,	X___,	X___,	X___,	REG_,	},
+
+	/* Handler registered, enabled, and running */
+/* 7 */	[REG_] = {	X___,	X___,	NOP_,	ReG_,	Reg_,	X___,	NOP_,	rEG_,	rEG_,	X___,	},
+
+	/*
+	 * Invalid states: no valid transition would leave the handler in these
+	 * states; and no transition from these states is possible either.
+	 */
+
+	/*
+	 * Handler can't be enabled without being registered. I.e., XEg is
+	 * impossible.
+	 */
+/* 2 */	[rEg_] = {	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	},
+/* 6 */	[REg_] = {	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	X___,	},
+};
+
+/*
+ * [1] Unregister will always also disable the event, so the new state will have
+ *     Xeg.
+ * [2] Event is considered for dispatch only when it's both registered and
+ *     enabled.
+ * [3] Never causes change in state.
+ * [4] Only allowed when running.
+ */
+
+/*
+ * Given an action, transition the state of an event by looking up the state
+ * table above:
+ *
+ *  - Return false for invalid transition;
+ *  - Return true for valid transition that causes no change in state;
+ *  - Otherwise, update state and return true.
+ *
+ * This function assumes that the caller holds necessary locks. If the
+ * transition has constrains other than the state table describes, the caller is
+ * expected to restore the previous state. See sdei_event_register() for
+ * example.
+ */
+bool can_sdei_state_trans(sdei_entry_t *se, sdei_action_t act)
+{
+	sdei_state_t next;
+
+	assert(act < DO_MAX);
+	if (se->state >= MAX_STATES) {
+		WARN(" event state invalid: %x\n", se->state);
+		return false;
+	}
+
+	next = sdei_state_table[se->state][act];
+	switch (next) {
+	case SDEI_STATE_INVALID:
+		return false;
+
+	case SDEI_STATE_NOP:
+		return true;
+
+	default:
+		/* Valid transition. Update state. */
+		SDEI_LOG(" event state 0x%x => 0x%x\n", se->state, next);
+		se->state = next;
+
+		return true;
+	}
+}
diff --git a/services/std_svc/spm/common/aarch64/spm_helpers.S b/services/std_svc/spm/common/aarch64/spm_helpers.S
new file mode 100644
index 0000000..95e69fb
--- /dev/null
+++ b/services/std_svc/spm/common/aarch64/spm_helpers.S
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "spm_common.h"
+
+	.global spm_secure_partition_enter
+	.global spm_secure_partition_exit
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with SP_EL0 as stack. Here we stash our EL3
+	 * callee-saved registers on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where the address of the C
+	 *  runtime context is to be saved.
+	 * ---------------------------------------------------------------------
+	 */
+func spm_secure_partition_enter
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #SP_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #SP_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #SP_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #SP_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #SP_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #SP_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #SP_C_RT_CTX_X29]
+
+	/* ---------------------------------------------------------------------
+	 * Everything is setup now. el3_exit() will use the secure context to
+	 * restore to the general purpose and EL3 system registers to ERET
+	 * into the secure payload.
+	 * ---------------------------------------------------------------------
+	 */
+	b	el3_exit
+endfunc spm_secure_partition_enter
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with 'x0' pointing to a C runtime context
+	 * saved in spm_secure_partition_enter().
+	 * It restores the saved registers and jumps to that runtime with 'x0'
+	 * as the new SP register. This destroys the C runtime context that had
+	 * been built on the stack below the saved context by the caller. Later
+	 * the second parameter 'x1' is passed as a return value to the caller.
+	 * ---------------------------------------------------------------------
+	 */
+func spm_secure_partition_exit
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(SP_C_RT_CTX_X19 - SP_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(SP_C_RT_CTX_X21 - SP_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(SP_C_RT_CTX_X23 - SP_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(SP_C_RT_CTX_X25 - SP_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(SP_C_RT_CTX_X27 - SP_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(SP_C_RT_CTX_X29 - SP_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------------------------------
+	 * This should take us back to the instruction after the call to the
+	 * last spm_secure_partition_enter().* Place the second parameter to x0
+	 * so that the caller will see it as a return value from the original
+	 * entry call.
+	 * ---------------------------------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc spm_secure_partition_exit
diff --git a/services/std_svc/spm/common/include/spm_common.h b/services/std_svc/spm/common/include/spm_common.h
new file mode 100644
index 0000000..68805fc
--- /dev/null
+++ b/services/std_svc/spm/common/include/spm_common.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPM_COMMON_H
+#define SPM_COMMON_H
+
+#include <context.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define SP_C_RT_CTX_X19		0x0
+#define SP_C_RT_CTX_X20		0x8
+#define SP_C_RT_CTX_X21		0x10
+#define SP_C_RT_CTX_X22		0x18
+#define SP_C_RT_CTX_X23		0x20
+#define SP_C_RT_CTX_X24		0x28
+#define SP_C_RT_CTX_X25		0x30
+#define SP_C_RT_CTX_X26		0x38
+#define SP_C_RT_CTX_X27		0x40
+#define SP_C_RT_CTX_X28		0x48
+#define SP_C_RT_CTX_X29		0x50
+#define SP_C_RT_CTX_X30		0x58
+
+#define SP_C_RT_CTX_SIZE	0x60
+#define SP_C_RT_CTX_ENTRIES	(SP_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+/* Assembly helpers */
+uint64_t spm_secure_partition_enter(uint64_t *c_rt_ctx);
+void __dead2 spm_secure_partition_exit(uint64_t c_rt_ctx, uint64_t ret);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* SPM_COMMON_H */
diff --git a/services/std_svc/spm/common/spm.mk b/services/std_svc/spm/common/spm.mk
new file mode 100644
index 0000000..9aa96be
--- /dev/null
+++ b/services/std_svc/spm/common/spm.mk
@@ -0,0 +1,17 @@
+#
+# Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${ARCH},aarch64)
+        $(error "Error: SPM is only supported on aarch64.")
+endif
+
+INCLUDES	+=	-Iservices/std_svc/spm/common/include
+
+SPM_SOURCES	:=	$(addprefix services/std_svc/spm/common/,\
+			${ARCH}/spm_helpers.S)
+
+# Let the top-level Makefile know that we intend to include a BL32 image
+NEED_BL32		:=	yes
diff --git a/services/std_svc/spm/el3_spmc/logical_sp.c b/services/std_svc/spm/el3_spmc/logical_sp.c
new file mode 100644
index 0000000..e080832
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/logical_sp.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#include <common/debug.h>
+#include <services/el3_spmc_logical_sp.h>
+#include <services/ffa_svc.h>
+#include "spmc.h"
+
+/*******************************************************************************
+ * Validate any logical partition descriptors before we initialise.
+ * Initialization of said partitions will be taken care of during SPMC boot.
+ ******************************************************************************/
+int el3_sp_desc_validate(void)
+{
+	struct el3_lp_desc *lp_array;
+
+	/*
+	 * Assert the number of descriptors is less than maximum allowed.
+	 * This constant should be define on a per platform basis.
+	 */
+	assert(EL3_LP_DESCS_COUNT <= MAX_EL3_LP_DESCS_COUNT);
+
+	/* Check the array bounds are valid. */
+	assert(EL3_LP_DESCS_END >= EL3_LP_DESCS_START);
+
+	/* If no logical partitions are implemented then simply bail out. */
+	if (EL3_LP_DESCS_COUNT == 0U) {
+		return 0;
+	}
+
+	lp_array = get_el3_lp_array();
+
+	for (unsigned int index = 0; index < EL3_LP_DESCS_COUNT; index++) {
+		struct el3_lp_desc *lp_desc = &lp_array[index];
+
+		/* Validate our logical partition descriptors. */
+		if (lp_desc == NULL) {
+			ERROR("Invalid Logical SP Descriptor\n");
+			return -EINVAL;
+		}
+
+		/*
+		 * Ensure the ID follows the convention to indidate it resides
+		 * in the secure world.
+		 */
+		if (!ffa_is_secure_world_id(lp_desc->sp_id)) {
+			ERROR("Invalid Logical SP ID (0x%x)\n",
+			      lp_desc->sp_id);
+			return -EINVAL;
+		}
+
+		/* Ensure we don't conflict with the SPMC partition ID. */
+		if (lp_desc->sp_id == FFA_SPMC_ID) {
+			ERROR("Logical SP ID clashes with SPMC ID(0x%x)\n",
+			      lp_desc->sp_id);
+			return -EINVAL;
+		}
+
+		/* Ensure the UUID is not the NULL UUID. */
+		if (lp_desc->uuid[0] == 0 && lp_desc->uuid[1] == 0 &&
+		    lp_desc->uuid[2] == 0 && lp_desc->uuid[3] == 0) {
+			ERROR("Invalid UUID for Logical SP (0x%x)\n",
+			      lp_desc->sp_id);
+			return -EINVAL;
+		}
+
+		/* Ensure init function callback is registered. */
+		if (lp_desc->init == NULL) {
+			ERROR("Missing init function for Logical SP(0x%x)\n",
+			      lp_desc->sp_id);
+			return -EINVAL;
+		}
+
+		/* Ensure that LP only supports receiving direct requests. */
+		if (lp_desc->properties &
+		    ~(FFA_PARTITION_DIRECT_REQ_RECV)) {
+			ERROR("Invalid partition properties (0x%x)\n",
+			      lp_desc->properties);
+			return -EINVAL;
+		}
+
+		/* Ensure direct request function callback is registered. */
+		if (lp_desc->direct_req == NULL) {
+			ERROR("No Direct Req handler for Logical SP (0x%x)\n",
+			      lp_desc->sp_id);
+			return -EINVAL;
+		}
+
+		/* Ensure that all partition IDs are unique. */
+		for (unsigned int inner_idx = index + 1;
+		     inner_idx < EL3_LP_DESCS_COUNT; inner_idx++) {
+			if (lp_desc->sp_id == lp_array[inner_idx].sp_id) {
+				ERROR("Duplicate SP ID Detected (0x%x)\n",
+				      lp_desc->sp_id);
+				return -EINVAL;
+			}
+		}
+	}
+	return 0;
+}
diff --git a/services/std_svc/spm/el3_spmc/spmc.h b/services/std_svc/spm/el3_spmc/spmc.h
new file mode 100644
index 0000000..5233650
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc.h
@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPMC_H
+#define SPMC_H
+
+#include <stdint.h>
+
+#include <common/bl_common.h>
+#include <lib/psci/psci.h>
+#include <lib/spinlock.h>
+#include <services/el3_spmc_logical_sp.h>
+#include "spm_common.h"
+
+/*
+ * Ranges of FF-A IDs for Normal world and Secure world components. The
+ * convention matches that used by other SPMCs i.e. Hafnium and OP-TEE.
+ */
+#define FFA_NWD_ID_BASE		0x0
+#define FFA_NWD_ID_LIMIT	0x7FFF
+#define FFA_SWD_ID_BASE		0x8000
+#define FFA_SWD_ID_LIMIT	SPMD_DIRECT_MSG_ENDPOINT_ID - 1
+#define FFA_SWD_ID_MASK		0x8000
+
+/* ID 0 is reserved for the normal world entity, (Hypervisor or OS Kernel). */
+#define FFA_NWD_ID		U(0)
+/* First ID is reserved for the SPMC */
+#define FFA_SPMC_ID		U(FFA_SWD_ID_BASE)
+/* SP IDs are allocated after the SPMC ID */
+#define FFA_SP_ID_BASE		(FFA_SPMC_ID + 1)
+/* Align with Hafnium implementation */
+#define INV_SP_ID		0x7FFF
+
+/* FF-A Related helper macros. */
+#define FFA_ID_MASK			U(0xFFFF)
+#define FFA_PARTITION_ID_SHIFT		U(16)
+#define FFA_FEATURES_BIT31_MASK		U(0x1u << 31)
+#define FFA_FEATURES_RET_REQ_NS_BIT	U(0x1 << 1)
+
+#define FFA_RUN_EP_ID(ep_vcpu_ids) \
+		((ep_vcpu_ids >> FFA_PARTITION_ID_SHIFT) & FFA_ID_MASK)
+#define FFA_RUN_VCPU_ID(ep_vcpu_ids) \
+		(ep_vcpu_ids & FFA_ID_MASK)
+
+#define FFA_PAGE_SIZE (4096)
+#define FFA_RXTX_PAGE_COUNT_MASK 0x1F
+
+/* Ensure that the page size used by TF-A is 4k aligned. */
+CASSERT((PAGE_SIZE % FFA_PAGE_SIZE) == 0, assert_aligned_page_size);
+
+/*
+ * Defines to allow an SP to subscribe for power management messages
+ */
+#define FFA_PM_MSG_SUB_CPU_OFF			U(1 << 0)
+#define FFA_PM_MSG_SUB_CPU_SUSPEND		U(1 << 1)
+#define FFA_PM_MSG_SUB_CPU_SUSPEND_RESUME	U(1 << 2)
+
+/*
+ * Runtime states of an execution context as per the FF-A v1.1 specification.
+ */
+enum sp_runtime_states {
+	RT_STATE_WAITING,
+	RT_STATE_RUNNING,
+	RT_STATE_PREEMPTED,
+	RT_STATE_BLOCKED
+};
+
+/*
+ * Runtime model of an execution context as per the FF-A v1.1 specification. Its
+ * value is valid only if the execution context is not in the waiting state.
+ */
+enum sp_runtime_model {
+	RT_MODEL_DIR_REQ,
+	RT_MODEL_RUN,
+	RT_MODEL_INIT,
+	RT_MODEL_INTR
+};
+
+enum sp_runtime_el {
+	EL1 = 0,
+	S_EL0,
+	S_EL1
+};
+
+enum sp_execution_state {
+	SP_STATE_AARCH64 = 0,
+	SP_STATE_AARCH32
+};
+
+enum mailbox_state {
+	/* There is no message in the mailbox. */
+	MAILBOX_STATE_EMPTY,
+
+	/* There is a message that has been populated in the mailbox. */
+	MAILBOX_STATE_FULL,
+};
+
+struct mailbox {
+	enum mailbox_state state;
+
+	/* RX/TX Buffers. */
+	void *rx_buffer;
+	const void *tx_buffer;
+
+	/* Size of RX/TX Buffer. */
+	uint32_t rxtx_page_count;
+
+	/* Lock access to mailbox. */
+	spinlock_t lock;
+};
+
+/*
+ * Execution context members for an SP. This is a bit like struct
+ * vcpu in a hypervisor.
+ */
+struct sp_exec_ctx {
+	/*
+	 * Store the stack address to restore C runtime context from after
+	 * returning from a synchronous entry into the SP.
+	 */
+	uint64_t c_rt_ctx;
+
+	/* Space to maintain the architectural state of an SP. */
+	cpu_context_t cpu_ctx;
+
+	/* Track the current runtime state of the SP. */
+	enum sp_runtime_states rt_state;
+
+	/* Track the current runtime model of the SP. */
+	enum sp_runtime_model rt_model;
+};
+
+/*
+ * Structure to describe the cumulative properties of an SP.
+ */
+struct secure_partition_desc {
+	/*
+	 * Execution contexts allocated to this endpoint. Ideally,
+	 * we need as many contexts as there are physical cpus only
+	 * for a S-EL1 SP which is MP-pinned.
+	 */
+	struct sp_exec_ctx ec[PLATFORM_CORE_COUNT];
+
+	/* ID of the Secure Partition. */
+	uint16_t sp_id;
+
+	/* Runtime EL. */
+	enum sp_runtime_el runtime_el;
+
+	/* Partition UUID. */
+	uint32_t uuid[4];
+
+	/* Partition Properties. */
+	uint32_t properties;
+
+	/* Supported FF-A Version. */
+	uint32_t ffa_version;
+
+	/* Execution State. */
+	enum sp_execution_state execution_state;
+
+	/* Mailbox tracking. */
+	struct mailbox mailbox;
+
+	/* Secondary entrypoint. Only valid for a S-EL1 SP. */
+	uintptr_t secondary_ep;
+
+	/*
+	 * Store whether the SP has subscribed to any power management messages.
+	 */
+	uint16_t pwr_mgmt_msgs;
+
+	/*
+	 * Store whether the SP has requested the use of the NS bit for memory
+	 * management transactions if it is using FF-A v1.0.
+	 */
+	bool ns_bit_requested;
+};
+
+/*
+ * This define identifies the only SP that will be initialised and participate
+ * in FF-A communication. The implementation leaves the door open for more SPs
+ * to be managed in future but for now it is reasonable to assume that either a
+ * single S-EL0 or a single S-EL1 SP will be supported. This define will be used
+ * to identify which SP descriptor to initialise and manage during SP runtime.
+ */
+#define ACTIVE_SP_DESC_INDEX	0
+
+/*
+ * Structure to describe the cumulative properties of the Hypervisor and
+ * NS-Endpoints.
+ */
+struct ns_endpoint_desc {
+	/*
+	 * ID of the NS-Endpoint or Hypervisor.
+	 */
+	uint16_t ns_ep_id;
+
+	/*
+	 * Mailbox tracking.
+	 */
+	struct mailbox mailbox;
+
+	/*
+	 * Supported FF-A Version
+	 */
+	uint32_t ffa_version;
+};
+
+/**
+ * Holds information returned for each partition by the FFA_PARTITION_INFO_GET
+ * interface.
+ */
+struct ffa_partition_info_v1_0 {
+	uint16_t ep_id;
+	uint16_t execution_ctx_count;
+	uint32_t properties;
+};
+
+/* Extended structure for v1.1. */
+struct ffa_partition_info_v1_1 {
+	uint16_t ep_id;
+	uint16_t execution_ctx_count;
+	uint32_t properties;
+	uint32_t uuid[4];
+};
+
+/* Reference to power management hooks */
+extern const spd_pm_ops_t spmc_pm;
+
+/* Setup Function for different SP types. */
+void spmc_sp_common_setup(struct secure_partition_desc *sp,
+			  entry_point_info_t *ep_info,
+			  int32_t boot_info_reg);
+void spmc_el1_sp_setup(struct secure_partition_desc *sp,
+		       entry_point_info_t *ep_info);
+void spmc_sp_common_ep_commit(struct secure_partition_desc *sp,
+			      entry_point_info_t *ep_info);
+
+/*
+ * Helper function to perform a synchronous entry into a SP.
+ */
+uint64_t spmc_sp_synchronous_entry(struct sp_exec_ctx *ec);
+
+/*
+ * Helper function to obtain the descriptor of the current SP on a physical cpu.
+ */
+struct secure_partition_desc *spmc_get_current_sp_ctx(void);
+
+/*
+ * Helper function to obtain the execution context of an SP on a
+ * physical cpu.
+ */
+struct sp_exec_ctx *spmc_get_sp_ec(struct secure_partition_desc *sp);
+
+/*
+ * Helper function to obtain the index of the execution context of an SP on a
+ * physical cpu.
+ */
+unsigned int get_ec_index(struct secure_partition_desc *sp);
+
+uint64_t spmc_ffa_error_return(void *handle, int error_code);
+
+/*
+ * Ensure a partition ID does not clash and follows the secure world convention.
+ */
+bool is_ffa_secure_id_valid(uint16_t partition_id);
+
+/*
+ * Helper function to obtain the array storing the EL3
+ * Logical Partition descriptors.
+ */
+struct el3_lp_desc *get_el3_lp_array(void);
+
+/*
+ * Helper function to obtain the RX/TX buffer pair descriptor of the Hypervisor
+ * or OS kernel in the normal world or the last SP that was run.
+ */
+struct mailbox *spmc_get_mbox_desc(bool secure_origin);
+
+/*
+ * Helper function to obtain the context of an SP with a given partition ID.
+ */
+struct secure_partition_desc *spmc_get_sp_ctx(uint16_t id);
+
+/*
+ * Add helper function to obtain the FF-A version of the calling
+ * partition.
+ */
+uint32_t get_partition_ffa_version(bool secure_origin);
+
+
+#endif /* SPMC_H */
diff --git a/services/std_svc/spm/el3_spmc/spmc.mk b/services/std_svc/spm/el3_spmc/spmc.mk
new file mode 100644
index 0000000..c674e71
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc.mk
@@ -0,0 +1,44 @@
+#
+# Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${ARCH},aarch64)
+        $(error "Error: SPMC is only supported on aarch64.")
+endif
+
+SPMC_SOURCES	:=	$(addprefix services/std_svc/spm/el3_spmc/,	\
+			spmc_main.c				\
+			spmc_setup.c				\
+			logical_sp.c				\
+			spmc_pm.c				\
+			spmc_shared_mem.c)
+
+# Specify platform specific logical partition implementation.
+SPMC_LP_SOURCES  := $(addprefix ${PLAT_DIR}/, \
+                    ${PLAT}_el3_spmc_logical_sp.c)
+
+
+SPMC_SOURCES += $(SPMC_LP_SOURCES)
+
+# Let the top-level Makefile know that we intend to include a BL32 image
+NEED_BL32		:=	yes
+
+ifndef BL32
+# The SPMC is paired with a Test Secure Payload source and we intend to
+# build the Test Secure Payload if no other image has been provided
+# for BL32.
+#
+# In cases where an associated Secure Payload lies outside this build
+# system/source tree, the dispatcher Makefile can either invoke an external
+# build command or assume it is pre-built.
+
+BL32_ROOT		:=	bl32/tsp
+
+# Conditionally include SP's Makefile. The assumption is that the TSP's build
+# system is compatible with that of Trusted Firmware, and it'll add and populate
+# necessary build targets and variables.
+
+include ${BL32_ROOT}/tsp.mk
+endif
diff --git a/services/std_svc/spm/el3_spmc/spmc_main.c b/services/std_svc/spm/el3_spmc/spmc_main.c
new file mode 100644
index 0000000..9b8621a
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_main.c
@@ -0,0 +1,1995 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+
+#include <arch_helpers.h>
+#include <bl31/bl31.h>
+#include <bl31/ehf.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <common/runtime_svc.h>
+#include <common/uuid.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/smccc.h>
+#include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <libfdt.h>
+#include <plat/common/platform.h>
+#include <services/el3_spmc_logical_sp.h>
+#include <services/ffa_svc.h>
+#include <services/spmc_svc.h>
+#include <services/spmd_svc.h>
+#include "spmc.h"
+#include "spmc_shared_mem.h"
+
+#include <platform_def.h>
+
+/* Declare the maximum number of SPs and El3 LPs. */
+#define MAX_SP_LP_PARTITIONS SECURE_PARTITION_COUNT + MAX_EL3_LP_DESCS_COUNT
+
+/*
+ * Allocate a secure partition descriptor to describe each SP in the system that
+ * does not reside at EL3.
+ */
+static struct secure_partition_desc sp_desc[SECURE_PARTITION_COUNT];
+
+/*
+ * Allocate an NS endpoint descriptor to describe each VM and the Hypervisor in
+ * the system that interacts with a SP. It is used to track the Hypervisor
+ * buffer pair, version and ID for now. It could be extended to track VM
+ * properties when the SPMC supports indirect messaging.
+ */
+static struct ns_endpoint_desc ns_ep_desc[NS_PARTITION_COUNT];
+
+static uint64_t spmc_sp_interrupt_handler(uint32_t id,
+					  uint32_t flags,
+					  void *handle,
+					  void *cookie);
+
+/*
+ * Helper function to obtain the array storing the EL3
+ * Logical Partition descriptors.
+ */
+struct el3_lp_desc *get_el3_lp_array(void)
+{
+	return (struct el3_lp_desc *) EL3_LP_DESCS_START;
+}
+
+/*
+ * Helper function to obtain the descriptor of the last SP to whom control was
+ * handed to on this physical cpu. Currently, we assume there is only one SP.
+ * TODO: Expand to track multiple partitions when required.
+ */
+struct secure_partition_desc *spmc_get_current_sp_ctx(void)
+{
+	return &(sp_desc[ACTIVE_SP_DESC_INDEX]);
+}
+
+/*
+ * Helper function to obtain the execution context of an SP on the
+ * current physical cpu.
+ */
+struct sp_exec_ctx *spmc_get_sp_ec(struct secure_partition_desc *sp)
+{
+	return &(sp->ec[get_ec_index(sp)]);
+}
+
+/* Helper function to get pointer to SP context from its ID. */
+struct secure_partition_desc *spmc_get_sp_ctx(uint16_t id)
+{
+	/* Check for Secure World Partitions. */
+	for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) {
+		if (sp_desc[i].sp_id == id) {
+			return &(sp_desc[i]);
+		}
+	}
+	return NULL;
+}
+
+/*
+ * Helper function to obtain the descriptor of the Hypervisor or OS kernel.
+ * We assume that the first descriptor is reserved for this entity.
+ */
+struct ns_endpoint_desc *spmc_get_hyp_ctx(void)
+{
+	return &(ns_ep_desc[0]);
+}
+
+/*
+ * Helper function to obtain the RX/TX buffer pair descriptor of the Hypervisor
+ * or OS kernel in the normal world or the last SP that was run.
+ */
+struct mailbox *spmc_get_mbox_desc(bool secure_origin)
+{
+	/* Obtain the RX/TX buffer pair descriptor. */
+	if (secure_origin) {
+		return &(spmc_get_current_sp_ctx()->mailbox);
+	} else {
+		return &(spmc_get_hyp_ctx()->mailbox);
+	}
+}
+
+/******************************************************************************
+ * This function returns to the place where spmc_sp_synchronous_entry() was
+ * called originally.
+ ******************************************************************************/
+__dead2 void spmc_sp_synchronous_exit(struct sp_exec_ctx *ec, uint64_t rc)
+{
+	/*
+	 * The SPM must have initiated the original request through a
+	 * synchronous entry into the secure partition. Jump back to the
+	 * original C runtime context with the value of rc in x0;
+	 */
+	spm_secure_partition_exit(ec->c_rt_ctx, rc);
+
+	panic();
+}
+
+/*******************************************************************************
+ * Return FFA_ERROR with specified error code.
+ ******************************************************************************/
+uint64_t spmc_ffa_error_return(void *handle, int error_code)
+{
+	SMC_RET8(handle, FFA_ERROR,
+		 FFA_TARGET_INFO_MBZ, error_code,
+		 FFA_PARAM_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+		 FFA_PARAM_MBZ, FFA_PARAM_MBZ);
+}
+
+/******************************************************************************
+ * Helper function to validate a secure partition ID to ensure it does not
+ * conflict with any other FF-A component and follows the convention to
+ * indicate it resides within the secure world.
+ ******************************************************************************/
+bool is_ffa_secure_id_valid(uint16_t partition_id)
+{
+	struct el3_lp_desc *el3_lp_descs = get_el3_lp_array();
+
+	/* Ensure the ID is not the invalid partition ID. */
+	if (partition_id == INV_SP_ID) {
+		return false;
+	}
+
+	/* Ensure the ID is not the SPMD ID. */
+	if (partition_id == SPMD_DIRECT_MSG_ENDPOINT_ID) {
+		return false;
+	}
+
+	/*
+	 * Ensure the ID follows the convention to indicate it resides
+	 * in the secure world.
+	 */
+	if (!ffa_is_secure_world_id(partition_id)) {
+		return false;
+	}
+
+	/* Ensure we don't conflict with the SPMC partition ID. */
+	if (partition_id == FFA_SPMC_ID) {
+		return false;
+	}
+
+	/* Ensure we do not already have an SP context with this ID. */
+	if (spmc_get_sp_ctx(partition_id)) {
+		return false;
+	}
+
+	/* Ensure we don't clash with any Logical SP's. */
+	for (unsigned int i = 0U; i < EL3_LP_DESCS_COUNT; i++) {
+		if (el3_lp_descs[i].sp_id == partition_id) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+/*******************************************************************************
+ * This function either forwards the request to the other world or returns
+ * with an ERET depending on the source of the call.
+ * We can assume that the destination is for an entity at a lower exception
+ * level as any messages destined for a logical SP resident in EL3 will have
+ * already been taken care of by the SPMC before entering this function.
+ ******************************************************************************/
+static uint64_t spmc_smc_return(uint32_t smc_fid,
+				bool secure_origin,
+				uint64_t x1,
+				uint64_t x2,
+				uint64_t x3,
+				uint64_t x4,
+				void *handle,
+				void *cookie,
+				uint64_t flags,
+				uint16_t dst_id)
+{
+	/* If the destination is in the normal world always go via the SPMD. */
+	if (ffa_is_normal_world_id(dst_id)) {
+		return spmd_smc_handler(smc_fid, x1, x2, x3, x4,
+					cookie, handle, flags);
+	}
+	/*
+	 * If the caller is secure and we want to return to the secure world,
+	 * ERET directly.
+	 */
+	else if (secure_origin && ffa_is_secure_world_id(dst_id)) {
+		SMC_RET5(handle, smc_fid, x1, x2, x3, x4);
+	}
+	/* If we originated in the normal world then switch contexts. */
+	else if (!secure_origin && ffa_is_secure_world_id(dst_id)) {
+		return spmd_smc_switch_state(smc_fid, secure_origin, x1, x2,
+					     x3, x4, handle);
+	} else {
+		/* Unknown State. */
+		panic();
+	}
+
+	/* Shouldn't be Reached. */
+	return 0;
+}
+
+/*******************************************************************************
+ * FF-A ABI Handlers.
+ ******************************************************************************/
+
+/*******************************************************************************
+ * Helper function to validate arg2 as part of a direct message.
+ ******************************************************************************/
+static inline bool direct_msg_validate_arg2(uint64_t x2)
+{
+	/* Check message type. */
+	if (x2 & FFA_FWK_MSG_BIT) {
+		/* We have a framework message, ensure it is a known message. */
+		if (x2 & ~(FFA_FWK_MSG_MASK | FFA_FWK_MSG_BIT)) {
+			VERBOSE("Invalid message format 0x%lx.\n", x2);
+			return false;
+		}
+	} else {
+		/* We have a partition messages, ensure x2 is not set. */
+		if (x2 != (uint64_t) 0) {
+			VERBOSE("Arg2 MBZ for partition messages. (0x%lx).\n",
+				x2);
+			return false;
+		}
+	}
+	return true;
+}
+
+/*******************************************************************************
+ * Handle direct request messages and route to the appropriate destination.
+ ******************************************************************************/
+static uint64_t direct_req_smc_handler(uint32_t smc_fid,
+				       bool secure_origin,
+				       uint64_t x1,
+				       uint64_t x2,
+				       uint64_t x3,
+				       uint64_t x4,
+				       void *cookie,
+				       void *handle,
+				       uint64_t flags)
+{
+	uint16_t dst_id = ffa_endpoint_destination(x1);
+	struct el3_lp_desc *el3_lp_descs;
+	struct secure_partition_desc *sp;
+	unsigned int idx;
+
+	/* Check if arg2 has been populated correctly based on message type. */
+	if (!direct_msg_validate_arg2(x2)) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	el3_lp_descs = get_el3_lp_array();
+
+	/* Check if the request is destined for a Logical Partition. */
+	for (unsigned int i = 0U; i < MAX_EL3_LP_DESCS_COUNT; i++) {
+		if (el3_lp_descs[i].sp_id == dst_id) {
+			return el3_lp_descs[i].direct_req(
+					smc_fid, secure_origin, x1, x2, x3, x4,
+					cookie, handle, flags);
+		}
+	}
+
+	/*
+	 * If the request was not targeted to a LSP and from the secure world
+	 * then it is invalid since a SP cannot call into the Normal world and
+	 * there is no other SP to call into. If there are other SPs in future
+	 * then the partition runtime model would need to be validated as well.
+	 */
+	if (secure_origin) {
+		VERBOSE("Direct request not supported to the Normal World.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Check if the SP ID is valid. */
+	sp = spmc_get_sp_ctx(dst_id);
+	if (sp == NULL) {
+		VERBOSE("Direct request to unknown partition ID (0x%x).\n",
+			dst_id);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Check that the target execution context is in a waiting state before
+	 * forwarding the direct request to it.
+	 */
+	idx = get_ec_index(sp);
+	if (sp->ec[idx].rt_state != RT_STATE_WAITING) {
+		VERBOSE("SP context on core%u is not waiting (%u).\n",
+			idx, sp->ec[idx].rt_model);
+		return spmc_ffa_error_return(handle, FFA_ERROR_BUSY);
+	}
+
+	/*
+	 * Everything checks out so forward the request to the SP after updating
+	 * its state and runtime model.
+	 */
+	sp->ec[idx].rt_state = RT_STATE_RUNNING;
+	sp->ec[idx].rt_model = RT_MODEL_DIR_REQ;
+	return spmc_smc_return(smc_fid, secure_origin, x1, x2, x3, x4,
+			       handle, cookie, flags, dst_id);
+}
+
+/*******************************************************************************
+ * Handle direct response messages and route to the appropriate destination.
+ ******************************************************************************/
+static uint64_t direct_resp_smc_handler(uint32_t smc_fid,
+					bool secure_origin,
+					uint64_t x1,
+					uint64_t x2,
+					uint64_t x3,
+					uint64_t x4,
+					void *cookie,
+					void *handle,
+					uint64_t flags)
+{
+	uint16_t dst_id = ffa_endpoint_destination(x1);
+	struct secure_partition_desc *sp;
+	unsigned int idx;
+
+	/* Check if arg2 has been populated correctly based on message type. */
+	if (!direct_msg_validate_arg2(x2)) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Check that the response did not originate from the Normal world. */
+	if (!secure_origin) {
+		VERBOSE("Direct Response not supported from Normal World.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Check that the response is either targeted to the Normal world or the
+	 * SPMC e.g. a PM response.
+	 */
+	if ((dst_id != FFA_SPMC_ID) && ffa_is_secure_world_id(dst_id)) {
+		VERBOSE("Direct response to invalid partition ID (0x%x).\n",
+			dst_id);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Obtain the SP descriptor and update its runtime state. */
+	sp = spmc_get_sp_ctx(ffa_endpoint_source(x1));
+	if (sp == NULL) {
+		VERBOSE("Direct response to unknown partition ID (0x%x).\n",
+			dst_id);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Sanity check state is being tracked correctly in the SPMC. */
+	idx = get_ec_index(sp);
+	assert(sp->ec[idx].rt_state == RT_STATE_RUNNING);
+
+	/* Ensure SP execution context was in the right runtime model. */
+	if (sp->ec[idx].rt_model != RT_MODEL_DIR_REQ) {
+		VERBOSE("SP context on core%u not handling direct req (%u).\n",
+			idx, sp->ec[idx].rt_model);
+		return spmc_ffa_error_return(handle, FFA_ERROR_DENIED);
+	}
+
+	/* Update the state of the SP execution context. */
+	sp->ec[idx].rt_state = RT_STATE_WAITING;
+
+	/*
+	 * If the receiver is not the SPMC then forward the response to the
+	 * Normal world.
+	 */
+	if (dst_id == FFA_SPMC_ID) {
+		spmc_sp_synchronous_exit(&sp->ec[idx], x4);
+		/* Should not get here. */
+		panic();
+	}
+
+	return spmc_smc_return(smc_fid, secure_origin, x1, x2, x3, x4,
+			       handle, cookie, flags, dst_id);
+}
+
+/*******************************************************************************
+ * This function handles the FFA_MSG_WAIT SMC to allow an SP to relinquish its
+ * cycles.
+ ******************************************************************************/
+static uint64_t msg_wait_handler(uint32_t smc_fid,
+				 bool secure_origin,
+				 uint64_t x1,
+				 uint64_t x2,
+				 uint64_t x3,
+				 uint64_t x4,
+				 void *cookie,
+				 void *handle,
+				 uint64_t flags)
+{
+	struct secure_partition_desc *sp;
+	unsigned int idx;
+
+	/*
+	 * Check that the response did not originate from the Normal world as
+	 * only the secure world can call this ABI.
+	 */
+	if (!secure_origin) {
+		VERBOSE("Normal world cannot call FFA_MSG_WAIT.\n");
+		return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+	}
+
+	/* Get the descriptor of the SP that invoked FFA_MSG_WAIT. */
+	sp = spmc_get_current_sp_ctx();
+	if (sp == NULL) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Get the execution context of the SP that invoked FFA_MSG_WAIT.
+	 */
+	idx = get_ec_index(sp);
+
+	/* Ensure SP execution context was in the right runtime model. */
+	if (sp->ec[idx].rt_model == RT_MODEL_DIR_REQ) {
+		return spmc_ffa_error_return(handle, FFA_ERROR_DENIED);
+	}
+
+	/* Sanity check the state is being tracked correctly in the SPMC. */
+	assert(sp->ec[idx].rt_state == RT_STATE_RUNNING);
+
+	/*
+	 * Perform a synchronous exit if the partition was initialising. The
+	 * state is updated after the exit.
+	 */
+	if (sp->ec[idx].rt_model == RT_MODEL_INIT) {
+		spmc_sp_synchronous_exit(&sp->ec[idx], x4);
+		/* Should not get here */
+		panic();
+	}
+
+	/* Update the state of the SP execution context. */
+	sp->ec[idx].rt_state = RT_STATE_WAITING;
+
+	/* Resume normal world if a secure interrupt was handled. */
+	if (sp->ec[idx].rt_model == RT_MODEL_INTR) {
+		/* FFA_MSG_WAIT can only be called from the secure world. */
+		unsigned int secure_state_in = SECURE;
+		unsigned int secure_state_out = NON_SECURE;
+
+		cm_el1_sysregs_context_save(secure_state_in);
+		cm_el1_sysregs_context_restore(secure_state_out);
+		cm_set_next_eret_context(secure_state_out);
+		SMC_RET0(cm_get_context(secure_state_out));
+	}
+
+	/* Forward the response to the Normal world. */
+	return spmc_smc_return(smc_fid, secure_origin, x1, x2, x3, x4,
+			       handle, cookie, flags, FFA_NWD_ID);
+}
+
+static uint64_t ffa_error_handler(uint32_t smc_fid,
+				 bool secure_origin,
+				 uint64_t x1,
+				 uint64_t x2,
+				 uint64_t x3,
+				 uint64_t x4,
+				 void *cookie,
+				 void *handle,
+				 uint64_t flags)
+{
+	struct secure_partition_desc *sp;
+	unsigned int idx;
+
+	/* Check that the response did not originate from the Normal world. */
+	if (!secure_origin) {
+		return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+	}
+
+	/* Get the descriptor of the SP that invoked FFA_ERROR. */
+	sp = spmc_get_current_sp_ctx();
+	if (sp == NULL) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Get the execution context of the SP that invoked FFA_ERROR. */
+	idx = get_ec_index(sp);
+
+	/*
+	 * We only expect FFA_ERROR to be received during SP initialisation
+	 * otherwise this is an invalid call.
+	 */
+	if (sp->ec[idx].rt_model == RT_MODEL_INIT) {
+		ERROR("SP 0x%x failed to initialize.\n", sp->sp_id);
+		spmc_sp_synchronous_exit(&sp->ec[idx], x2);
+		/* Should not get here. */
+		panic();
+	}
+
+	return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+}
+
+static uint64_t ffa_version_handler(uint32_t smc_fid,
+				    bool secure_origin,
+				    uint64_t x1,
+				    uint64_t x2,
+				    uint64_t x3,
+				    uint64_t x4,
+				    void *cookie,
+				    void *handle,
+				    uint64_t flags)
+{
+	uint32_t requested_version = x1 & FFA_VERSION_MASK;
+
+	if (requested_version & FFA_VERSION_BIT31_MASK) {
+		/* Invalid encoding, return an error. */
+		SMC_RET1(handle, FFA_ERROR_NOT_SUPPORTED);
+		/* Execution stops here. */
+	}
+
+	/* Determine the caller to store the requested version. */
+	if (secure_origin) {
+		/*
+		 * Ensure that the SP is reporting the same version as
+		 * specified in its manifest. If these do not match there is
+		 * something wrong with the SP.
+		 * TODO: Should we abort the SP? For now assert this is not
+		 *       case.
+		 */
+		assert(requested_version ==
+		       spmc_get_current_sp_ctx()->ffa_version);
+	} else {
+		/*
+		 * If this is called by the normal world, record this
+		 * information in its descriptor.
+		 */
+		spmc_get_hyp_ctx()->ffa_version = requested_version;
+	}
+
+	SMC_RET1(handle, MAKE_FFA_VERSION(FFA_VERSION_MAJOR,
+					  FFA_VERSION_MINOR));
+}
+
+/*******************************************************************************
+ * Helper function to obtain the FF-A version of the calling partition.
+ ******************************************************************************/
+uint32_t get_partition_ffa_version(bool secure_origin)
+{
+	if (secure_origin) {
+		return spmc_get_current_sp_ctx()->ffa_version;
+	} else {
+		return spmc_get_hyp_ctx()->ffa_version;
+	}
+}
+
+static uint64_t rxtx_map_handler(uint32_t smc_fid,
+				 bool secure_origin,
+				 uint64_t x1,
+				 uint64_t x2,
+				 uint64_t x3,
+				 uint64_t x4,
+				 void *cookie,
+				 void *handle,
+				 uint64_t flags)
+{
+	int ret;
+	uint32_t error_code;
+	uint32_t mem_atts = secure_origin ? MT_SECURE : MT_NS;
+	struct mailbox *mbox;
+	uintptr_t tx_address = x1;
+	uintptr_t rx_address = x2;
+	uint32_t page_count = x3 & FFA_RXTX_PAGE_COUNT_MASK; /* Bits [5:0] */
+	uint32_t buf_size = page_count * FFA_PAGE_SIZE;
+
+	/*
+	 * The SPMC does not support mapping of VM RX/TX pairs to facilitate
+	 * indirect messaging with SPs. Check if the Hypervisor has invoked this
+	 * ABI on behalf of a VM and reject it if this is the case.
+	 */
+	if (tx_address == 0 || rx_address == 0) {
+		WARN("Mapping RX/TX Buffers on behalf of VM not supported.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Ensure the specified buffers are not the same. */
+	if (tx_address == rx_address) {
+		WARN("TX Buffer must not be the same as RX Buffer.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Ensure the buffer size is not 0. */
+	if (buf_size == 0U) {
+		WARN("Buffer size must not be 0\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Ensure the buffer size is a multiple of the translation granule size
+	 * in TF-A.
+	 */
+	if (buf_size % PAGE_SIZE != 0U) {
+		WARN("Buffer size must be aligned to translation granule.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Obtain the RX/TX buffer pair descriptor. */
+	mbox = spmc_get_mbox_desc(secure_origin);
+
+	spin_lock(&mbox->lock);
+
+	/* Check if buffers have already been mapped. */
+	if (mbox->rx_buffer != 0 || mbox->tx_buffer != 0) {
+		WARN("RX/TX Buffers already mapped (%p/%p)\n",
+		     (void *) mbox->rx_buffer, (void *)mbox->tx_buffer);
+		error_code = FFA_ERROR_DENIED;
+		goto err;
+	}
+
+	/* memmap the TX buffer as read only. */
+	ret = mmap_add_dynamic_region(tx_address, /* PA */
+			tx_address, /* VA */
+			buf_size, /* size */
+			mem_atts | MT_RO_DATA); /* attrs */
+	if (ret != 0) {
+		/* Return the correct error code. */
+		error_code = (ret == -ENOMEM) ? FFA_ERROR_NO_MEMORY :
+						FFA_ERROR_INVALID_PARAMETER;
+		WARN("Unable to map TX buffer: %d\n", error_code);
+		goto err;
+	}
+
+	/* memmap the RX buffer as read write. */
+	ret = mmap_add_dynamic_region(rx_address, /* PA */
+			rx_address, /* VA */
+			buf_size, /* size */
+			mem_atts | MT_RW_DATA); /* attrs */
+
+	if (ret != 0) {
+		error_code = (ret == -ENOMEM) ? FFA_ERROR_NO_MEMORY :
+						FFA_ERROR_INVALID_PARAMETER;
+		WARN("Unable to map RX buffer: %d\n", error_code);
+		/* Unmap the TX buffer again. */
+		mmap_remove_dynamic_region(tx_address, buf_size);
+		goto err;
+	}
+
+	mbox->tx_buffer = (void *) tx_address;
+	mbox->rx_buffer = (void *) rx_address;
+	mbox->rxtx_page_count = page_count;
+	spin_unlock(&mbox->lock);
+
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+	/* Execution stops here. */
+err:
+	spin_unlock(&mbox->lock);
+	return spmc_ffa_error_return(handle, error_code);
+}
+
+static uint64_t rxtx_unmap_handler(uint32_t smc_fid,
+				   bool secure_origin,
+				   uint64_t x1,
+				   uint64_t x2,
+				   uint64_t x3,
+				   uint64_t x4,
+				   void *cookie,
+				   void *handle,
+				   uint64_t flags)
+{
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+	uint32_t buf_size = mbox->rxtx_page_count * FFA_PAGE_SIZE;
+
+	/*
+	 * The SPMC does not support mapping of VM RX/TX pairs to facilitate
+	 * indirect messaging with SPs. Check if the Hypervisor has invoked this
+	 * ABI on behalf of a VM and reject it if this is the case.
+	 */
+	if (x1 != 0UL) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&mbox->lock);
+
+	/* Check if buffers are currently mapped. */
+	if (mbox->rx_buffer == 0 || mbox->tx_buffer == 0) {
+		spin_unlock(&mbox->lock);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Unmap RX Buffer */
+	if (mmap_remove_dynamic_region((uintptr_t) mbox->rx_buffer,
+				       buf_size) != 0) {
+		WARN("Unable to unmap RX buffer!\n");
+	}
+
+	mbox->rx_buffer = 0;
+
+	/* Unmap TX Buffer */
+	if (mmap_remove_dynamic_region((uintptr_t) mbox->tx_buffer,
+				       buf_size) != 0) {
+		WARN("Unable to unmap TX buffer!\n");
+	}
+
+	mbox->tx_buffer = 0;
+	mbox->rxtx_page_count = 0;
+
+	spin_unlock(&mbox->lock);
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+}
+
+/*
+ * Collate the partition information in a v1.1 partition information
+ * descriptor format, this will be converter later if required.
+ */
+static int partition_info_get_handler_v1_1(uint32_t *uuid,
+					   struct ffa_partition_info_v1_1
+						  *partitions,
+					   uint32_t max_partitions,
+					   uint32_t *partition_count)
+{
+	uint32_t index;
+	struct ffa_partition_info_v1_1 *desc;
+	bool null_uuid = is_null_uuid(uuid);
+	struct el3_lp_desc *el3_lp_descs = get_el3_lp_array();
+
+	/* Deal with Logical Partitions. */
+	for (index = 0U; index < EL3_LP_DESCS_COUNT; index++) {
+		if (null_uuid || uuid_match(uuid, el3_lp_descs[index].uuid)) {
+			/* Found a matching UUID, populate appropriately. */
+			if (*partition_count >= max_partitions) {
+				return FFA_ERROR_NO_MEMORY;
+			}
+
+			desc = &partitions[*partition_count];
+			desc->ep_id = el3_lp_descs[index].sp_id;
+			desc->execution_ctx_count = PLATFORM_CORE_COUNT;
+			desc->properties = el3_lp_descs[index].properties;
+			if (null_uuid) {
+				copy_uuid(desc->uuid, el3_lp_descs[index].uuid);
+			}
+			(*partition_count)++;
+		}
+	}
+
+	/* Deal with physical SP's. */
+	for (index = 0U; index < SECURE_PARTITION_COUNT; index++) {
+		if (null_uuid || uuid_match(uuid, sp_desc[index].uuid)) {
+			/* Found a matching UUID, populate appropriately. */
+			if (*partition_count >= max_partitions) {
+				return FFA_ERROR_NO_MEMORY;
+			}
+
+			desc = &partitions[*partition_count];
+			desc->ep_id = sp_desc[index].sp_id;
+			/*
+			 * Execution context count must match No. cores for
+			 * S-EL1 SPs.
+			 */
+			desc->execution_ctx_count = PLATFORM_CORE_COUNT;
+			desc->properties = sp_desc[index].properties;
+			if (null_uuid) {
+				copy_uuid(desc->uuid, sp_desc[index].uuid);
+			}
+			(*partition_count)++;
+		}
+	}
+	return 0;
+}
+
+/*
+ * Handle the case where that caller only wants the count of partitions
+ * matching a given UUID and does not want the corresponding descriptors
+ * populated.
+ */
+static uint32_t partition_info_get_handler_count_only(uint32_t *uuid)
+{
+	uint32_t index = 0;
+	uint32_t partition_count = 0;
+	bool null_uuid = is_null_uuid(uuid);
+	struct el3_lp_desc *el3_lp_descs = get_el3_lp_array();
+
+	/* Deal with Logical Partitions. */
+	for (index = 0U; index < EL3_LP_DESCS_COUNT; index++) {
+		if (null_uuid ||
+		    uuid_match(uuid, el3_lp_descs[index].uuid)) {
+			(partition_count)++;
+		}
+	}
+
+	/* Deal with physical SP's. */
+	for (index = 0U; index < SECURE_PARTITION_COUNT; index++) {
+		if (null_uuid || uuid_match(uuid, sp_desc[index].uuid)) {
+			(partition_count)++;
+		}
+	}
+	return partition_count;
+}
+
+/*
+ * If the caller of the PARTITION_INFO_GET ABI was a v1.0 caller, populate
+ * the coresponding descriptor format from the v1.1 descriptor array.
+ */
+static uint64_t partition_info_populate_v1_0(struct ffa_partition_info_v1_1
+					     *partitions,
+					     struct mailbox *mbox,
+					     int partition_count)
+{
+	uint32_t index;
+	uint32_t buf_size;
+	uint32_t descriptor_size;
+	struct ffa_partition_info_v1_0 *v1_0_partitions =
+		(struct ffa_partition_info_v1_0 *) mbox->rx_buffer;
+
+	buf_size = mbox->rxtx_page_count * FFA_PAGE_SIZE;
+	descriptor_size = partition_count *
+			  sizeof(struct ffa_partition_info_v1_0);
+
+	if (descriptor_size > buf_size) {
+		return FFA_ERROR_NO_MEMORY;
+	}
+
+	for (index = 0U; index < partition_count; index++) {
+		v1_0_partitions[index].ep_id = partitions[index].ep_id;
+		v1_0_partitions[index].execution_ctx_count =
+			partitions[index].execution_ctx_count;
+		v1_0_partitions[index].properties =
+			partitions[index].properties;
+	}
+	return 0;
+}
+
+/*
+ * Main handler for FFA_PARTITION_INFO_GET which supports both FF-A v1.1 and
+ * v1.0 implementations.
+ */
+static uint64_t partition_info_get_handler(uint32_t smc_fid,
+					   bool secure_origin,
+					   uint64_t x1,
+					   uint64_t x2,
+					   uint64_t x3,
+					   uint64_t x4,
+					   void *cookie,
+					   void *handle,
+					   uint64_t flags)
+{
+	int ret;
+	uint32_t partition_count = 0;
+	uint32_t size = 0;
+	uint32_t ffa_version = get_partition_ffa_version(secure_origin);
+	struct mailbox *mbox;
+	uint64_t info_get_flags;
+	bool count_only;
+	uint32_t uuid[4];
+
+	uuid[0] = x1;
+	uuid[1] = x2;
+	uuid[2] = x3;
+	uuid[3] = x4;
+
+	/* Determine if the Partition descriptors should be populated. */
+	info_get_flags = SMC_GET_GP(handle, CTX_GPREG_X5);
+	count_only = (info_get_flags & FFA_PARTITION_INFO_GET_COUNT_FLAG_MASK);
+
+	/* Handle the case where we don't need to populate the descriptors. */
+	if (count_only) {
+		partition_count = partition_info_get_handler_count_only(uuid);
+		if (partition_count == 0) {
+			return spmc_ffa_error_return(handle,
+						FFA_ERROR_INVALID_PARAMETER);
+		}
+	} else {
+		struct ffa_partition_info_v1_1 partitions[MAX_SP_LP_PARTITIONS];
+
+		/*
+		 * Handle the case where the partition descriptors are required,
+		 * check we have the buffers available and populate the
+		 * appropriate structure version.
+		 */
+
+		/* Obtain the v1.1 format of the descriptors. */
+		ret = partition_info_get_handler_v1_1(uuid, partitions,
+						      MAX_SP_LP_PARTITIONS,
+						      &partition_count);
+
+		/* Check if an error occurred during discovery. */
+		if (ret != 0) {
+			goto err;
+		}
+
+		/* If we didn't find any matches the UUID is unknown. */
+		if (partition_count == 0) {
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err;
+		}
+
+		/* Obtain the partition mailbox RX/TX buffer pair descriptor. */
+		mbox = spmc_get_mbox_desc(secure_origin);
+
+		/*
+		 * If the caller has not bothered registering its RX/TX pair
+		 * then return an error code.
+		 */
+		spin_lock(&mbox->lock);
+		if (mbox->rx_buffer == NULL) {
+			ret = FFA_ERROR_BUSY;
+			goto err_unlock;
+		}
+
+		/* Ensure the RX buffer is currently free. */
+		if (mbox->state != MAILBOX_STATE_EMPTY) {
+			ret = FFA_ERROR_BUSY;
+			goto err_unlock;
+		}
+
+		/* Zero the RX buffer before populating. */
+		(void)memset(mbox->rx_buffer, 0,
+			     mbox->rxtx_page_count * FFA_PAGE_SIZE);
+
+		/*
+		 * Depending on the FF-A version of the requesting partition
+		 * we may need to convert to a v1.0 format otherwise we can copy
+		 * directly.
+		 */
+		if (ffa_version == MAKE_FFA_VERSION(U(1), U(0))) {
+			ret = partition_info_populate_v1_0(partitions,
+							   mbox,
+							   partition_count);
+			if (ret != 0) {
+				goto err_unlock;
+			}
+		} else {
+			uint32_t buf_size = mbox->rxtx_page_count *
+					    FFA_PAGE_SIZE;
+
+			/* Ensure the descriptor will fit in the buffer. */
+			size = sizeof(struct ffa_partition_info_v1_1);
+			if (partition_count * size  > buf_size) {
+				ret = FFA_ERROR_NO_MEMORY;
+				goto err_unlock;
+			}
+			memcpy(mbox->rx_buffer, partitions,
+			       partition_count * size);
+		}
+
+		mbox->state = MAILBOX_STATE_FULL;
+		spin_unlock(&mbox->lock);
+	}
+	SMC_RET4(handle, FFA_SUCCESS_SMC32, 0, partition_count, size);
+
+err_unlock:
+	spin_unlock(&mbox->lock);
+err:
+	return spmc_ffa_error_return(handle, ret);
+}
+
+static uint64_t ffa_feature_success(void *handle, uint32_t arg2)
+{
+	SMC_RET3(handle, FFA_SUCCESS_SMC32, 0, arg2);
+}
+
+static uint64_t ffa_features_retrieve_request(bool secure_origin,
+					      uint32_t input_properties,
+					      void *handle)
+{
+	/*
+	 * If we're called by the normal world we don't support any
+	 * additional features.
+	 */
+	if (!secure_origin) {
+		if ((input_properties & FFA_FEATURES_RET_REQ_NS_BIT) != 0U) {
+			return spmc_ffa_error_return(handle,
+						     FFA_ERROR_NOT_SUPPORTED);
+		}
+
+	} else {
+		struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+		/*
+		 * If v1.1 the NS bit must be set otherwise it is an invalid
+		 * call. If v1.0 check and store whether the SP has requested
+		 * the use of the NS bit.
+		 */
+		if (sp->ffa_version == MAKE_FFA_VERSION(1, 1)) {
+			if ((input_properties &
+			     FFA_FEATURES_RET_REQ_NS_BIT) == 0U) {
+				return spmc_ffa_error_return(handle,
+						       FFA_ERROR_NOT_SUPPORTED);
+			}
+			return ffa_feature_success(handle,
+						   FFA_FEATURES_RET_REQ_NS_BIT);
+		} else {
+			sp->ns_bit_requested = (input_properties &
+					       FFA_FEATURES_RET_REQ_NS_BIT) !=
+					       0U;
+		}
+		if (sp->ns_bit_requested) {
+			return ffa_feature_success(handle,
+						   FFA_FEATURES_RET_REQ_NS_BIT);
+		}
+	}
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+}
+
+static uint64_t ffa_features_handler(uint32_t smc_fid,
+				     bool secure_origin,
+				     uint64_t x1,
+				     uint64_t x2,
+				     uint64_t x3,
+				     uint64_t x4,
+				     void *cookie,
+				     void *handle,
+				     uint64_t flags)
+{
+	uint32_t function_id = (uint32_t) x1;
+	uint32_t input_properties = (uint32_t) x2;
+
+	/* Check if a Feature ID was requested. */
+	if ((function_id & FFA_FEATURES_BIT31_MASK) == 0U) {
+		/* We currently don't support any additional features. */
+		return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+	}
+
+	/*
+	 * Handle the cases where we have separate handlers due to additional
+	 * properties.
+	 */
+	switch (function_id) {
+	case FFA_MEM_RETRIEVE_REQ_SMC32:
+	case FFA_MEM_RETRIEVE_REQ_SMC64:
+		return ffa_features_retrieve_request(secure_origin,
+						     input_properties,
+						     handle);
+	}
+
+	/*
+	 * We don't currently support additional input properties for these
+	 * other ABIs therefore ensure this value is set to 0.
+	 */
+	if (input_properties != 0U) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_NOT_SUPPORTED);
+	}
+
+	/* Report if any other FF-A ABI is supported. */
+	switch (function_id) {
+	/* Supported features from both worlds. */
+	case FFA_ERROR:
+	case FFA_SUCCESS_SMC32:
+	case FFA_INTERRUPT:
+	case FFA_SPM_ID_GET:
+	case FFA_ID_GET:
+	case FFA_FEATURES:
+	case FFA_VERSION:
+	case FFA_RX_RELEASE:
+	case FFA_MSG_SEND_DIRECT_REQ_SMC32:
+	case FFA_MSG_SEND_DIRECT_REQ_SMC64:
+	case FFA_PARTITION_INFO_GET:
+	case FFA_RXTX_MAP_SMC32:
+	case FFA_RXTX_MAP_SMC64:
+	case FFA_RXTX_UNMAP:
+	case FFA_MEM_FRAG_TX:
+	case FFA_MSG_RUN:
+
+		/*
+		 * We are relying on the fact that the other registers
+		 * will be set to 0 as these values align with the
+		 * currently implemented features of the SPMC. If this
+		 * changes this function must be extended to handle
+		 * reporting the additional functionality.
+		 */
+
+		SMC_RET1(handle, FFA_SUCCESS_SMC32);
+		/* Execution stops here. */
+
+	/* Supported ABIs only from the secure world. */
+	case FFA_SECONDARY_EP_REGISTER_SMC64:
+	case FFA_MSG_SEND_DIRECT_RESP_SMC32:
+	case FFA_MSG_SEND_DIRECT_RESP_SMC64:
+	case FFA_MEM_RELINQUISH:
+	case FFA_MSG_WAIT:
+
+		if (!secure_origin) {
+			return spmc_ffa_error_return(handle,
+				FFA_ERROR_NOT_SUPPORTED);
+		}
+		SMC_RET1(handle, FFA_SUCCESS_SMC32);
+		/* Execution stops here. */
+
+	/* Supported features only from the normal world. */
+	case FFA_MEM_SHARE_SMC32:
+	case FFA_MEM_SHARE_SMC64:
+	case FFA_MEM_LEND_SMC32:
+	case FFA_MEM_LEND_SMC64:
+	case FFA_MEM_RECLAIM:
+	case FFA_MEM_FRAG_RX:
+
+		if (secure_origin) {
+			return spmc_ffa_error_return(handle,
+					FFA_ERROR_NOT_SUPPORTED);
+		}
+		SMC_RET1(handle, FFA_SUCCESS_SMC32);
+		/* Execution stops here. */
+
+	default:
+		return spmc_ffa_error_return(handle,
+					FFA_ERROR_NOT_SUPPORTED);
+	}
+}
+
+static uint64_t ffa_id_get_handler(uint32_t smc_fid,
+				   bool secure_origin,
+				   uint64_t x1,
+				   uint64_t x2,
+				   uint64_t x3,
+				   uint64_t x4,
+				   void *cookie,
+				   void *handle,
+				   uint64_t flags)
+{
+	if (secure_origin) {
+		SMC_RET3(handle, FFA_SUCCESS_SMC32, 0x0,
+			 spmc_get_current_sp_ctx()->sp_id);
+	} else {
+		SMC_RET3(handle, FFA_SUCCESS_SMC32, 0x0,
+			 spmc_get_hyp_ctx()->ns_ep_id);
+	}
+}
+
+/*
+ * Enable an SP to query the ID assigned to the SPMC.
+ */
+static uint64_t ffa_spm_id_get_handler(uint32_t smc_fid,
+				       bool secure_origin,
+				       uint64_t x1,
+				       uint64_t x2,
+				       uint64_t x3,
+				       uint64_t x4,
+				       void *cookie,
+				       void *handle,
+				       uint64_t flags)
+{
+	assert(x1 == 0UL);
+	assert(x2 == 0UL);
+	assert(x3 == 0UL);
+	assert(x4 == 0UL);
+	assert(SMC_GET_GP(handle, CTX_GPREG_X5) == 0UL);
+	assert(SMC_GET_GP(handle, CTX_GPREG_X6) == 0UL);
+	assert(SMC_GET_GP(handle, CTX_GPREG_X7) == 0UL);
+
+	SMC_RET3(handle, FFA_SUCCESS_SMC32, 0x0, FFA_SPMC_ID);
+}
+
+static uint64_t ffa_run_handler(uint32_t smc_fid,
+				bool secure_origin,
+				uint64_t x1,
+				uint64_t x2,
+				uint64_t x3,
+				uint64_t x4,
+				void *cookie,
+				void *handle,
+				uint64_t flags)
+{
+	struct secure_partition_desc *sp;
+	uint16_t target_id = FFA_RUN_EP_ID(x1);
+	uint16_t vcpu_id = FFA_RUN_VCPU_ID(x1);
+	unsigned int idx;
+	unsigned int *rt_state;
+	unsigned int *rt_model;
+
+	/* Can only be called from the normal world. */
+	if (secure_origin) {
+		ERROR("FFA_RUN can only be called from NWd.\n");
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Cannot run a Normal world partition. */
+	if (ffa_is_normal_world_id(target_id)) {
+		ERROR("Cannot run a NWd partition (0x%x).\n", target_id);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Check that the target SP exists. */
+	sp = spmc_get_sp_ctx(target_id);
+		ERROR("Unknown partition ID (0x%x).\n", target_id);
+	if (sp == NULL) {
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	idx = get_ec_index(sp);
+	if (idx != vcpu_id) {
+		ERROR("Cannot run vcpu %d != %d.\n", idx, vcpu_id);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+	rt_state = &((sp->ec[idx]).rt_state);
+	rt_model = &((sp->ec[idx]).rt_model);
+	if (*rt_state == RT_STATE_RUNNING) {
+		ERROR("Partition (0x%x) is already running.\n", target_id);
+		return spmc_ffa_error_return(handle, FFA_ERROR_BUSY);
+	}
+
+	/*
+	 * Sanity check that if the execution context was not waiting then it
+	 * was either in the direct request or the run partition runtime model.
+	 */
+	if (*rt_state == RT_STATE_PREEMPTED || *rt_state == RT_STATE_BLOCKED) {
+		assert(*rt_model == RT_MODEL_RUN ||
+		       *rt_model == RT_MODEL_DIR_REQ);
+	}
+
+	/*
+	 * If the context was waiting then update the partition runtime model.
+	 */
+	if (*rt_state == RT_STATE_WAITING) {
+		*rt_model = RT_MODEL_RUN;
+	}
+
+	/*
+	 * Forward the request to the correct SP vCPU after updating
+	 * its state.
+	 */
+	*rt_state = RT_STATE_RUNNING;
+
+	return spmc_smc_return(smc_fid, secure_origin, x1, 0, 0, 0,
+			       handle, cookie, flags, target_id);
+}
+
+static uint64_t rx_release_handler(uint32_t smc_fid,
+				   bool secure_origin,
+				   uint64_t x1,
+				   uint64_t x2,
+				   uint64_t x3,
+				   uint64_t x4,
+				   void *cookie,
+				   void *handle,
+				   uint64_t flags)
+{
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+
+	spin_lock(&mbox->lock);
+
+	if (mbox->state != MAILBOX_STATE_FULL) {
+		spin_unlock(&mbox->lock);
+		return spmc_ffa_error_return(handle, FFA_ERROR_DENIED);
+	}
+
+	mbox->state = MAILBOX_STATE_EMPTY;
+	spin_unlock(&mbox->lock);
+
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+}
+
+/*
+ * Perform initial validation on the provided secondary entry point.
+ * For now ensure it does not lie within the BL31 Image or the SP's
+ * RX/TX buffers as these are mapped within EL3.
+ * TODO: perform validation for additional invalid memory regions.
+ */
+static int validate_secondary_ep(uintptr_t ep, struct secure_partition_desc *sp)
+{
+	struct mailbox *mb;
+	uintptr_t buffer_size;
+	uintptr_t sp_rx_buffer;
+	uintptr_t sp_tx_buffer;
+	uintptr_t sp_rx_buffer_limit;
+	uintptr_t sp_tx_buffer_limit;
+
+	mb = &sp->mailbox;
+	buffer_size = (uintptr_t) (mb->rxtx_page_count * FFA_PAGE_SIZE);
+	sp_rx_buffer = (uintptr_t) mb->rx_buffer;
+	sp_tx_buffer = (uintptr_t) mb->tx_buffer;
+	sp_rx_buffer_limit = sp_rx_buffer + buffer_size;
+	sp_tx_buffer_limit = sp_tx_buffer + buffer_size;
+
+	/*
+	 * Check if the entry point lies within BL31, or the
+	 * SP's RX or TX buffer.
+	 */
+	if ((ep >= BL31_BASE && ep < BL31_LIMIT) ||
+	    (ep >= sp_rx_buffer && ep < sp_rx_buffer_limit) ||
+	    (ep >= sp_tx_buffer && ep < sp_tx_buffer_limit)) {
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*******************************************************************************
+ * This function handles the FFA_SECONDARY_EP_REGISTER SMC to allow an SP to
+ *  register an entry point for initialization during a secondary cold boot.
+ ******************************************************************************/
+static uint64_t ffa_sec_ep_register_handler(uint32_t smc_fid,
+					    bool secure_origin,
+					    uint64_t x1,
+					    uint64_t x2,
+					    uint64_t x3,
+					    uint64_t x4,
+					    void *cookie,
+					    void *handle,
+					    uint64_t flags)
+{
+	struct secure_partition_desc *sp;
+	struct sp_exec_ctx *sp_ctx;
+
+	/* This request cannot originate from the Normal world. */
+	if (!secure_origin) {
+		WARN("%s: Can only be called from SWd.\n", __func__);
+		return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+	}
+
+	/* Get the context of the current SP. */
+	sp = spmc_get_current_sp_ctx();
+	if (sp == NULL) {
+		WARN("%s: Cannot find SP context.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/* Only an S-EL1 SP should be invoking this ABI. */
+	if (sp->runtime_el != S_EL1) {
+		WARN("%s: Can only be called for a S-EL1 SP.\n", __func__);
+		return spmc_ffa_error_return(handle, FFA_ERROR_DENIED);
+	}
+
+	/* Ensure the SP is in its initialization state. */
+	sp_ctx = spmc_get_sp_ec(sp);
+	if (sp_ctx->rt_model != RT_MODEL_INIT) {
+		WARN("%s: Can only be called during SP initialization.\n",
+		     __func__);
+		return spmc_ffa_error_return(handle, FFA_ERROR_DENIED);
+	}
+
+	/* Perform initial validation of the secondary entry point. */
+	if (validate_secondary_ep(x1, sp)) {
+		WARN("%s: Invalid entry point provided (0x%lx).\n",
+		     __func__, x1);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Update the secondary entrypoint in SP context.
+	 * We don't need a lock here as during partition initialization there
+	 * will only be a single core online.
+	 */
+	sp->secondary_ep = x1;
+	VERBOSE("%s: 0x%lx\n", __func__, sp->secondary_ep);
+
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+}
+
+/*******************************************************************************
+ * This function will parse the Secure Partition Manifest. From manifest, it
+ * will fetch details for preparing Secure partition image context and secure
+ * partition image boot arguments if any.
+ ******************************************************************************/
+static int sp_manifest_parse(void *sp_manifest, int offset,
+			     struct secure_partition_desc *sp,
+			     entry_point_info_t *ep_info,
+			     int32_t *boot_info_reg)
+{
+	int32_t ret, node;
+	uint32_t config_32;
+
+	/*
+	 * Look for the mandatory fields that are expected to be present in
+	 * the SP manifests.
+	 */
+	node = fdt_path_offset(sp_manifest, "/");
+	if (node < 0) {
+		ERROR("Did not find root node.\n");
+		return node;
+	}
+
+	ret = fdt_read_uint32_array(sp_manifest, node, "uuid",
+				    ARRAY_SIZE(sp->uuid), sp->uuid);
+	if (ret != 0) {
+		ERROR("Missing Secure Partition UUID.\n");
+		return ret;
+	}
+
+	ret = fdt_read_uint32(sp_manifest, node, "exception-level", &config_32);
+	if (ret != 0) {
+		ERROR("Missing SP Exception Level information.\n");
+		return ret;
+	}
+
+	sp->runtime_el = config_32;
+
+	ret = fdt_read_uint32(sp_manifest, node, "ffa-version", &config_32);
+	if (ret != 0) {
+		ERROR("Missing Secure Partition FF-A Version.\n");
+		return ret;
+	}
+
+	sp->ffa_version = config_32;
+
+	ret = fdt_read_uint32(sp_manifest, node, "execution-state", &config_32);
+	if (ret != 0) {
+		ERROR("Missing Secure Partition Execution State.\n");
+		return ret;
+	}
+
+	sp->execution_state = config_32;
+
+	ret = fdt_read_uint32(sp_manifest, node,
+			      "messaging-method", &config_32);
+	if (ret != 0) {
+		ERROR("Missing Secure Partition messaging method.\n");
+		return ret;
+	}
+
+	/* Validate this entry, we currently only support direct messaging. */
+	if ((config_32 & ~(FFA_PARTITION_DIRECT_REQ_RECV |
+			  FFA_PARTITION_DIRECT_REQ_SEND)) != 0U) {
+		WARN("Invalid Secure Partition messaging method (0x%x)\n",
+		     config_32);
+		return -EINVAL;
+	}
+
+	sp->properties = config_32;
+
+	ret = fdt_read_uint32(sp_manifest, node,
+			      "execution-ctx-count", &config_32);
+
+	if (ret != 0) {
+		ERROR("Missing SP Execution Context Count.\n");
+		return ret;
+	}
+
+	/*
+	 * Ensure this field is set correctly in the manifest however
+	 * since this is currently a hardcoded value for S-EL1 partitions
+	 * we don't need to save it here, just validate.
+	 */
+	if (config_32 != PLATFORM_CORE_COUNT) {
+		ERROR("SP Execution Context Count (%u) must be %u.\n",
+			config_32, PLATFORM_CORE_COUNT);
+		return -EINVAL;
+	}
+
+	/*
+	 * Look for the optional fields that are expected to be present in
+	 * an SP manifest.
+	 */
+	ret = fdt_read_uint32(sp_manifest, node, "id", &config_32);
+	if (ret != 0) {
+		WARN("Missing Secure Partition ID.\n");
+	} else {
+		if (!is_ffa_secure_id_valid(config_32)) {
+			ERROR("Invalid Secure Partition ID (0x%x).\n",
+			      config_32);
+			return -EINVAL;
+		}
+		sp->sp_id = config_32;
+	}
+
+	ret = fdt_read_uint32(sp_manifest, node,
+			      "power-management-messages", &config_32);
+	if (ret != 0) {
+		WARN("Missing Power Management Messages entry.\n");
+	} else {
+		/*
+		 * Ensure only the currently supported power messages have
+		 * been requested.
+		 */
+		if (config_32 & ~(FFA_PM_MSG_SUB_CPU_OFF |
+				  FFA_PM_MSG_SUB_CPU_SUSPEND |
+				  FFA_PM_MSG_SUB_CPU_SUSPEND_RESUME)) {
+			ERROR("Requested unsupported PM messages (%x)\n",
+			      config_32);
+			return -EINVAL;
+		}
+		sp->pwr_mgmt_msgs = config_32;
+	}
+
+	ret = fdt_read_uint32(sp_manifest, node,
+			      "gp-register-num", &config_32);
+	if (ret != 0) {
+		WARN("Missing boot information register.\n");
+	} else {
+		/* Check if a register number between 0-3 is specified. */
+		if (config_32 < 4) {
+			*boot_info_reg = config_32;
+		} else {
+			WARN("Incorrect boot information register (%u).\n",
+			     config_32);
+		}
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function gets the Secure Partition Manifest base and maps the manifest
+ * region.
+ * Currently only one Secure Partition manifest is considered which is used to
+ * prepare the context for the single Secure Partition.
+ ******************************************************************************/
+static int find_and_prepare_sp_context(void)
+{
+	void *sp_manifest;
+	uintptr_t manifest_base;
+	uintptr_t manifest_base_align;
+	entry_point_info_t *next_image_ep_info;
+	int32_t ret, boot_info_reg = -1;
+	struct secure_partition_desc *sp;
+
+	next_image_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (next_image_ep_info == NULL) {
+		WARN("No Secure Partition image provided by BL2.\n");
+		return -ENOENT;
+	}
+
+	sp_manifest = (void *)next_image_ep_info->args.arg0;
+	if (sp_manifest == NULL) {
+		WARN("Secure Partition manifest absent.\n");
+		return -ENOENT;
+	}
+
+	manifest_base = (uintptr_t)sp_manifest;
+	manifest_base_align = page_align(manifest_base, DOWN);
+
+	/*
+	 * Map the secure partition manifest region in the EL3 translation
+	 * regime.
+	 * Map an area equal to (2 * PAGE_SIZE) for now. During manifest base
+	 * alignment the region of 1 PAGE_SIZE from manifest align base may
+	 * not completely accommodate the secure partition manifest region.
+	 */
+	ret = mmap_add_dynamic_region((unsigned long long)manifest_base_align,
+				      manifest_base_align,
+				      PAGE_SIZE * 2,
+				      MT_RO_DATA);
+	if (ret != 0) {
+		ERROR("Error while mapping SP manifest (%d).\n", ret);
+		return ret;
+	}
+
+	ret = fdt_node_offset_by_compatible(sp_manifest, -1,
+					    "arm,ffa-manifest-1.0");
+	if (ret < 0) {
+		ERROR("Error happened in SP manifest reading.\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Store the size of the manifest so that it can be used later to pass
+	 * the manifest as boot information later.
+	 */
+	next_image_ep_info->args.arg1 = fdt_totalsize(sp_manifest);
+	INFO("Manifest size = %lu bytes.\n", next_image_ep_info->args.arg1);
+
+	/*
+	 * Select an SP descriptor for initialising the partition's execution
+	 * context on the primary CPU.
+	 */
+	sp = spmc_get_current_sp_ctx();
+
+	/* Initialize entry point information for the SP */
+	SET_PARAM_HEAD(next_image_ep_info, PARAM_EP, VERSION_1,
+		       SECURE | EP_ST_ENABLE);
+
+	/* Parse the SP manifest. */
+	ret = sp_manifest_parse(sp_manifest, ret, sp, next_image_ep_info,
+				&boot_info_reg);
+	if (ret != 0) {
+		ERROR("Error in Secure Partition manifest parsing.\n");
+		return ret;
+	}
+
+	/* Check that the runtime EL in the manifest was correct. */
+	if (sp->runtime_el != S_EL1) {
+		ERROR("Unexpected runtime EL: %d\n", sp->runtime_el);
+		return -EINVAL;
+	}
+
+	/* Perform any common initialisation. */
+	spmc_sp_common_setup(sp, next_image_ep_info, boot_info_reg);
+
+	/* Perform any initialisation specific to S-EL1 SPs. */
+	spmc_el1_sp_setup(sp, next_image_ep_info);
+
+	/* Initialize the SP context with the required ep info. */
+	spmc_sp_common_ep_commit(sp, next_image_ep_info);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * This function takes an SP context pointer and performs a synchronous entry
+ * into it.
+ ******************************************************************************/
+static int32_t logical_sp_init(void)
+{
+	int32_t rc = 0;
+	struct el3_lp_desc *el3_lp_descs;
+
+	/* Perform initial validation of the Logical Partitions. */
+	rc = el3_sp_desc_validate();
+	if (rc != 0) {
+		ERROR("Logical Partition validation failed!\n");
+		return rc;
+	}
+
+	el3_lp_descs = get_el3_lp_array();
+
+	INFO("Logical Secure Partition init start.\n");
+	for (unsigned int i = 0U; i < EL3_LP_DESCS_COUNT; i++) {
+		rc = el3_lp_descs[i].init();
+		if (rc != 0) {
+			ERROR("Logical SP (0x%x) Failed to Initialize\n",
+			      el3_lp_descs[i].sp_id);
+			return rc;
+		}
+		VERBOSE("Logical SP (0x%x) Initialized\n",
+			      el3_lp_descs[i].sp_id);
+	}
+
+	INFO("Logical Secure Partition init completed.\n");
+
+	return rc;
+}
+
+uint64_t spmc_sp_synchronous_entry(struct sp_exec_ctx *ec)
+{
+	uint64_t rc;
+
+	assert(ec != NULL);
+
+	/* Assign the context of the SP to this CPU */
+	cm_set_context(&(ec->cpu_ctx), SECURE);
+
+	/* Restore the context assigned above */
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	/* Invalidate TLBs at EL1. */
+	tlbivmalle1();
+	dsbish();
+
+	/* Enter Secure Partition */
+	rc = spm_secure_partition_enter(&ec->c_rt_ctx);
+
+	/* Save secure state */
+	cm_el1_sysregs_context_save(SECURE);
+
+	return rc;
+}
+
+/*******************************************************************************
+ * SPMC Helper Functions.
+ ******************************************************************************/
+static int32_t sp_init(void)
+{
+	uint64_t rc;
+	struct secure_partition_desc *sp;
+	struct sp_exec_ctx *ec;
+
+	sp = spmc_get_current_sp_ctx();
+	ec = spmc_get_sp_ec(sp);
+	ec->rt_model = RT_MODEL_INIT;
+	ec->rt_state = RT_STATE_RUNNING;
+
+	INFO("Secure Partition (0x%x) init start.\n", sp->sp_id);
+
+	rc = spmc_sp_synchronous_entry(ec);
+	if (rc != 0) {
+		/* Indicate SP init was not successful. */
+		ERROR("SP (0x%x) failed to initialize (%lu).\n",
+		      sp->sp_id, rc);
+		return 0;
+	}
+
+	ec->rt_state = RT_STATE_WAITING;
+	INFO("Secure Partition initialized.\n");
+
+	return 1;
+}
+
+static void initalize_sp_descs(void)
+{
+	struct secure_partition_desc *sp;
+
+	for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) {
+		sp = &sp_desc[i];
+		sp->sp_id = INV_SP_ID;
+		sp->mailbox.rx_buffer = NULL;
+		sp->mailbox.tx_buffer = NULL;
+		sp->mailbox.state = MAILBOX_STATE_EMPTY;
+		sp->secondary_ep = 0;
+	}
+}
+
+static void initalize_ns_ep_descs(void)
+{
+	struct ns_endpoint_desc *ns_ep;
+
+	for (unsigned int i = 0U; i < NS_PARTITION_COUNT; i++) {
+		ns_ep = &ns_ep_desc[i];
+		/*
+		 * Clashes with the Hypervisor ID but will not be a
+		 * problem in practice.
+		 */
+		ns_ep->ns_ep_id = 0;
+		ns_ep->ffa_version = 0;
+		ns_ep->mailbox.rx_buffer = NULL;
+		ns_ep->mailbox.tx_buffer = NULL;
+		ns_ep->mailbox.state = MAILBOX_STATE_EMPTY;
+	}
+}
+
+/*******************************************************************************
+ * Initialize SPMC attributes for the SPMD.
+ ******************************************************************************/
+void spmc_populate_attrs(spmc_manifest_attribute_t *spmc_attrs)
+{
+	spmc_attrs->major_version = FFA_VERSION_MAJOR;
+	spmc_attrs->minor_version = FFA_VERSION_MINOR;
+	spmc_attrs->exec_state = MODE_RW_64;
+	spmc_attrs->spmc_id = FFA_SPMC_ID;
+}
+
+/*******************************************************************************
+ * Initialize contexts of all Secure Partitions.
+ ******************************************************************************/
+int32_t spmc_setup(void)
+{
+	int32_t ret;
+	uint32_t flags;
+
+	/* Initialize endpoint descriptors */
+	initalize_sp_descs();
+	initalize_ns_ep_descs();
+
+	/*
+	 * Retrieve the information of the datastore for tracking shared memory
+	 * requests allocated by platform code and zero the region if available.
+	 */
+	ret = plat_spmc_shmem_datastore_get(&spmc_shmem_obj_state.data,
+					    &spmc_shmem_obj_state.data_size);
+	if (ret != 0) {
+		ERROR("Failed to obtain memory descriptor backing store!\n");
+		return ret;
+	}
+	memset(spmc_shmem_obj_state.data, 0, spmc_shmem_obj_state.data_size);
+
+	/* Setup logical SPs. */
+	ret = logical_sp_init();
+	if (ret != 0) {
+		ERROR("Failed to initialize Logical Partitions.\n");
+		return ret;
+	}
+
+	/* Perform physical SP setup. */
+
+	/* Disable MMU at EL1 (initialized by BL2) */
+	disable_mmu_icache_el1();
+
+	/* Initialize context of the SP */
+	INFO("Secure Partition context setup start.\n");
+
+	ret = find_and_prepare_sp_context();
+	if (ret != 0) {
+		ERROR("Error in SP finding and context preparation.\n");
+		return ret;
+	}
+
+	/* Register power management hooks with PSCI */
+	psci_register_spd_pm_hook(&spmc_pm);
+
+	/*
+	 * Register an interrupt handler for S-EL1 interrupts
+	 * when generated during code executing in the
+	 * non-secure state.
+	 */
+	flags = 0;
+	set_interrupt_rm_flag(flags, NON_SECURE);
+	ret = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+					      spmc_sp_interrupt_handler,
+					      flags);
+	if (ret != 0) {
+		ERROR("Failed to register interrupt handler! (%d)\n", ret);
+		panic();
+	}
+
+	/* Register init function for deferred init.  */
+	bl31_register_bl32_init(&sp_init);
+
+	INFO("Secure Partition setup done.\n");
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Secure Partition Manager SMC handler.
+ ******************************************************************************/
+uint64_t spmc_smc_handler(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint64_t x1,
+			  uint64_t x2,
+			  uint64_t x3,
+			  uint64_t x4,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	switch (smc_fid) {
+
+	case FFA_VERSION:
+		return ffa_version_handler(smc_fid, secure_origin, x1, x2, x3,
+					   x4, cookie, handle, flags);
+
+	case FFA_SPM_ID_GET:
+		return ffa_spm_id_get_handler(smc_fid, secure_origin, x1, x2,
+					     x3, x4, cookie, handle, flags);
+
+	case FFA_ID_GET:
+		return ffa_id_get_handler(smc_fid, secure_origin, x1, x2, x3,
+					  x4, cookie, handle, flags);
+
+	case FFA_FEATURES:
+		return ffa_features_handler(smc_fid, secure_origin, x1, x2, x3,
+					    x4, cookie, handle, flags);
+
+	case FFA_SECONDARY_EP_REGISTER_SMC64:
+		return ffa_sec_ep_register_handler(smc_fid, secure_origin, x1,
+						   x2, x3, x4, cookie, handle,
+						   flags);
+
+	case FFA_MSG_SEND_DIRECT_REQ_SMC32:
+	case FFA_MSG_SEND_DIRECT_REQ_SMC64:
+		return direct_req_smc_handler(smc_fid, secure_origin, x1, x2,
+					      x3, x4, cookie, handle, flags);
+
+	case FFA_MSG_SEND_DIRECT_RESP_SMC32:
+	case FFA_MSG_SEND_DIRECT_RESP_SMC64:
+		return direct_resp_smc_handler(smc_fid, secure_origin, x1, x2,
+					       x3, x4, cookie, handle, flags);
+
+	case FFA_RXTX_MAP_SMC32:
+	case FFA_RXTX_MAP_SMC64:
+		return rxtx_map_handler(smc_fid, secure_origin, x1, x2, x3, x4,
+					cookie, handle, flags);
+
+	case FFA_RXTX_UNMAP:
+		return rxtx_unmap_handler(smc_fid, secure_origin, x1, x2, x3,
+					  x4, cookie, handle, flags);
+
+	case FFA_PARTITION_INFO_GET:
+		return partition_info_get_handler(smc_fid, secure_origin, x1,
+						  x2, x3, x4, cookie, handle,
+						  flags);
+
+	case FFA_RX_RELEASE:
+		return rx_release_handler(smc_fid, secure_origin, x1, x2, x3,
+					  x4, cookie, handle, flags);
+
+	case FFA_MSG_WAIT:
+		return msg_wait_handler(smc_fid, secure_origin, x1, x2, x3, x4,
+					cookie, handle, flags);
+
+	case FFA_ERROR:
+		return ffa_error_handler(smc_fid, secure_origin, x1, x2, x3, x4,
+					cookie, handle, flags);
+
+	case FFA_MSG_RUN:
+		return ffa_run_handler(smc_fid, secure_origin, x1, x2, x3, x4,
+				       cookie, handle, flags);
+
+	case FFA_MEM_SHARE_SMC32:
+	case FFA_MEM_SHARE_SMC64:
+	case FFA_MEM_LEND_SMC32:
+	case FFA_MEM_LEND_SMC64:
+		return spmc_ffa_mem_send(smc_fid, secure_origin, x1, x2, x3, x4,
+					 cookie, handle, flags);
+
+	case FFA_MEM_FRAG_TX:
+		return spmc_ffa_mem_frag_tx(smc_fid, secure_origin, x1, x2, x3,
+					    x4, cookie, handle, flags);
+
+	case FFA_MEM_FRAG_RX:
+		return spmc_ffa_mem_frag_rx(smc_fid, secure_origin, x1, x2, x3,
+					    x4, cookie, handle, flags);
+
+	case FFA_MEM_RETRIEVE_REQ_SMC32:
+	case FFA_MEM_RETRIEVE_REQ_SMC64:
+		return spmc_ffa_mem_retrieve_req(smc_fid, secure_origin, x1, x2,
+						 x3, x4, cookie, handle, flags);
+
+	case FFA_MEM_RELINQUISH:
+		return spmc_ffa_mem_relinquish(smc_fid, secure_origin, x1, x2,
+					       x3, x4, cookie, handle, flags);
+
+	case FFA_MEM_RECLAIM:
+		return spmc_ffa_mem_reclaim(smc_fid, secure_origin, x1, x2, x3,
+					    x4, cookie, handle, flags);
+
+	default:
+		WARN("Unsupported FF-A call 0x%08x.\n", smc_fid);
+		break;
+	}
+	return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+}
+
+/*******************************************************************************
+ * This function is the handler registered for S-EL1 interrupts by the SPMC. It
+ * validates the interrupt and upon success arranges entry into the SP for
+ * handling the interrupt.
+ ******************************************************************************/
+static uint64_t spmc_sp_interrupt_handler(uint32_t id,
+					  uint32_t flags,
+					  void *handle,
+					  void *cookie)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	struct sp_exec_ctx *ec;
+	uint32_t linear_id = plat_my_core_pos();
+
+	/* Sanity check for a NULL pointer dereference. */
+	assert(sp != NULL);
+
+	/* Check the security state when the exception was generated. */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+
+	/* Panic if not an S-EL1 Partition. */
+	if (sp->runtime_el != S_EL1) {
+		ERROR("Interrupt received for a non S-EL1 SP on core%u.\n",
+		      linear_id);
+		panic();
+	}
+
+	/* Obtain a reference to the SP execution context. */
+	ec = spmc_get_sp_ec(sp);
+
+	/* Ensure that the execution context is in waiting state else panic. */
+	if (ec->rt_state != RT_STATE_WAITING) {
+		ERROR("SP EC on core%u is not waiting (%u), it is (%u).\n",
+		      linear_id, RT_STATE_WAITING, ec->rt_state);
+		panic();
+	}
+
+	/* Update the runtime model and state of the partition. */
+	ec->rt_model = RT_MODEL_INTR;
+	ec->rt_state = RT_STATE_RUNNING;
+
+	VERBOSE("SP (0x%x) interrupt start on core%u.\n", sp->sp_id, linear_id);
+
+	/*
+	 * Forward the interrupt to the S-EL1 SP. The interrupt ID is not
+	 * populated as the SP can determine this by itself.
+	 */
+	return spmd_smc_switch_state(FFA_INTERRUPT, false,
+				     FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				     FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				     handle);
+}
diff --git a/services/std_svc/spm/el3_spmc/spmc_pm.c b/services/std_svc/spm/el3_spmc/spmc_pm.c
new file mode 100644
index 0000000..d25344c
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_pm.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/spinlock.h>
+#include <plat/common/common_def.h>
+#include <plat/common/platform.h>
+#include <services/ffa_svc.h>
+#include "spmc.h"
+
+#include <platform_def.h>
+
+/*******************************************************************************
+ * spmc_build_pm_message
+ *
+ * Builds an SPMC to SP direct message request.
+ ******************************************************************************/
+static void spmc_build_pm_message(gp_regs_t *gpregs,
+				  unsigned long long message,
+				  uint8_t pm_msg_type,
+				  uint16_t sp_id)
+{
+	write_ctx_reg(gpregs, CTX_GPREG_X0, FFA_MSG_SEND_DIRECT_REQ_SMC32);
+	write_ctx_reg(gpregs, CTX_GPREG_X1,
+		      (FFA_SPMC_ID << FFA_DIRECT_MSG_SOURCE_SHIFT) |
+		      sp_id);
+	write_ctx_reg(gpregs, CTX_GPREG_X2, FFA_FWK_MSG_BIT |
+		      (pm_msg_type & FFA_FWK_MSG_MASK));
+	write_ctx_reg(gpregs, CTX_GPREG_X3, message);
+}
+
+/*******************************************************************************
+ * This CPU has been turned on. Enter the SP to initialise S-EL1.
+ ******************************************************************************/
+static void spmc_cpu_on_finish_handler(u_register_t unused)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	struct sp_exec_ctx *ec;
+	unsigned int linear_id = plat_my_core_pos();
+	entry_point_info_t sec_ec_ep_info = {0};
+	uint64_t rc;
+
+	/* Sanity check for a NULL pointer dereference. */
+	assert(sp != NULL);
+
+	/* Initialize entry point information for the SP. */
+	SET_PARAM_HEAD(&sec_ec_ep_info, PARAM_EP, VERSION_1,
+		       SECURE | EP_ST_ENABLE);
+
+	/*
+	 * Check if the primary execution context registered an entry point else
+	 * bail out early.
+	 * TODO: Add support for boot reason in manifest to allow jumping to
+	 * entrypoint into the primary execution context.
+	 */
+	if (sp->secondary_ep == 0) {
+		WARN("%s: No secondary ep on core%u\n", __func__, linear_id);
+		return;
+	}
+
+	sec_ec_ep_info.pc = sp->secondary_ep;
+
+	/*
+	 * Setup and initialise the SP execution context on this physical cpu.
+	 */
+	spmc_el1_sp_setup(sp, &sec_ec_ep_info);
+	spmc_sp_common_ep_commit(sp, &sec_ec_ep_info);
+
+	/* Obtain a reference to the SP execution context. */
+	ec = spmc_get_sp_ec(sp);
+
+	/*
+	 * TODO: Should we do some PM related state tracking of the SP execution
+	 * context here?
+	 */
+
+	/* Update the runtime model and state of the partition. */
+	ec->rt_model = RT_MODEL_INIT;
+	ec->rt_state = RT_STATE_RUNNING;
+
+	INFO("SP (0x%x) init start on core%u.\n", sp->sp_id, linear_id);
+
+	rc = spmc_sp_synchronous_entry(ec);
+	if (rc != 0ULL) {
+		ERROR("%s failed (%lu) on CPU%u\n", __func__, rc, linear_id);
+	}
+
+	/* Update the runtime state of the partition. */
+	ec->rt_state = RT_STATE_WAITING;
+
+	VERBOSE("CPU %u on!\n", linear_id);
+}
+/*******************************************************************************
+ * Helper function to send a FF-A power management message to an SP.
+ ******************************************************************************/
+static int32_t spmc_send_pm_msg(uint8_t pm_msg_type,
+				unsigned long long psci_event)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	struct sp_exec_ctx *ec;
+	gp_regs_t *gpregs_ctx;
+	unsigned int linear_id = plat_my_core_pos();
+	u_register_t resp;
+	uint64_t rc;
+
+	/* Obtain a reference to the SP execution context. */
+	ec = spmc_get_sp_ec(sp);
+
+	/*
+	 * TODO: Should we do some PM related state tracking of the SP execution
+	 * context here?
+	 */
+
+	/*
+	 * Build an SPMC to SP direct message request.
+	 * Note that x4-x6 should be populated with the original PSCI arguments.
+	 */
+	spmc_build_pm_message(get_gpregs_ctx(&ec->cpu_ctx),
+			      psci_event,
+			      pm_msg_type,
+			      sp->sp_id);
+
+	/* Sanity check partition state. */
+	assert(ec->rt_state == RT_STATE_WAITING);
+
+	/* Update the runtime model and state of the partition. */
+	ec->rt_model = RT_MODEL_DIR_REQ;
+	ec->rt_state = RT_STATE_RUNNING;
+
+	rc = spmc_sp_synchronous_entry(ec);
+	if (rc != 0ULL) {
+		ERROR("%s failed (%lu) on CPU%u.\n", __func__, rc, linear_id);
+		assert(false);
+		return -EINVAL;
+	}
+
+	/*
+	 * Validate we receive an expected response from the SP.
+	 * TODO: We don't currently support aborting an SP in the scenario
+	 * where it is misbehaving so assert these conditions are not
+	 * met for now.
+	 */
+	gpregs_ctx = get_gpregs_ctx(&ec->cpu_ctx);
+
+	/* Expect a direct message response from the SP. */
+	resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X0);
+	if (resp != FFA_MSG_SEND_DIRECT_RESP_SMC32) {
+		ERROR("%s invalid SP response (%lx).\n", __func__, resp);
+		assert(false);
+		return -EINVAL;
+	}
+
+	/* Ensure the sender and receiver are populated correctly. */
+	resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X1);
+	if (!(ffa_endpoint_source(resp) == sp->sp_id &&
+	      ffa_endpoint_destination(resp) == FFA_SPMC_ID)) {
+		ERROR("%s invalid src/dst response (%lx).\n", __func__, resp);
+		assert(false);
+		return -EINVAL;
+	}
+
+	/* Expect a PM message response from the SP. */
+	resp = read_ctx_reg(gpregs_ctx, CTX_GPREG_X2);
+	if ((resp & FFA_FWK_MSG_BIT) == 0U ||
+	    ((resp & FFA_FWK_MSG_MASK) != FFA_PM_MSG_PM_RESP)) {
+		ERROR("%s invalid PM response (%lx).\n", __func__, resp);
+		assert(false);
+		return -EINVAL;
+	}
+
+	/* Update the runtime state of the partition. */
+	ec->rt_state = RT_STATE_WAITING;
+
+	/* Return the status code returned by the SP */
+	return read_ctx_reg(gpregs_ctx, CTX_GPREG_X3);
+}
+
+/*******************************************************************************
+ * spmc_cpu_suspend_finish_handler
+ ******************************************************************************/
+static void spmc_cpu_suspend_finish_handler(u_register_t unused)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	unsigned int linear_id = plat_my_core_pos();
+	int32_t rc;
+
+	/* Sanity check for a NULL pointer dereference. */
+	assert(sp != NULL);
+
+	/*
+	 * Check if the SP has subscribed for this power management message.
+	 * If not then we don't have anything else to do here.
+	 */
+	if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_SUSPEND_RESUME) == 0U) {
+		goto exit;
+	}
+
+	rc = spmc_send_pm_msg(FFA_PM_MSG_WB_REQ, FFA_WB_TYPE_NOTS2RAM);
+	if (rc < 0) {
+		ERROR("%s failed (%d) on CPU%u\n", __func__, rc, linear_id);
+		return;
+	}
+
+exit:
+	VERBOSE("CPU %u resumed!\n", linear_id);
+}
+
+/*******************************************************************************
+ * spmc_cpu_suspend_handler
+ ******************************************************************************/
+static void spmc_cpu_suspend_handler(u_register_t unused)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	unsigned int linear_id = plat_my_core_pos();
+	int32_t rc;
+
+	/* Sanity check for a NULL pointer dereference. */
+	assert(sp != NULL);
+
+	/*
+	 * Check if the SP has subscribed for this power management message.
+	 * If not then we don't have anything else to do here.
+	 */
+	if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_SUSPEND) == 0U) {
+		goto exit;
+	}
+
+	rc = spmc_send_pm_msg(FFA_FWK_MSG_PSCI, PSCI_CPU_SUSPEND_AARCH64);
+	if (rc < 0) {
+		ERROR("%s failed (%d) on CPU%u\n", __func__, rc, linear_id);
+		return;
+	}
+exit:
+	VERBOSE("CPU %u suspend!\n", linear_id);
+}
+
+/*******************************************************************************
+ * spmc_cpu_off_handler
+ ******************************************************************************/
+static int32_t spmc_cpu_off_handler(u_register_t unused)
+{
+	struct secure_partition_desc *sp = spmc_get_current_sp_ctx();
+	unsigned int linear_id = plat_my_core_pos();
+	int32_t ret = 0;
+
+	/* Sanity check for a NULL pointer dereference. */
+	assert(sp != NULL);
+
+	/*
+	 * Check if the SP has subscribed for this power management message.
+	 * If not then we don't have anything else to do here.
+	 */
+	if ((sp->pwr_mgmt_msgs & FFA_PM_MSG_SUB_CPU_OFF) == 0U) {
+		goto exit;
+	}
+
+	ret = spmc_send_pm_msg(FFA_FWK_MSG_PSCI, PSCI_CPU_OFF);
+	if (ret < 0) {
+		ERROR("%s failed (%d) on CPU%u\n", __func__, ret, linear_id);
+		return ret;
+	}
+
+exit:
+	VERBOSE("CPU %u off!\n", linear_id);
+	return ret;
+}
+
+/*******************************************************************************
+ * Structure populated by the SPM Core to perform any bookkeeping before
+ * PSCI executes a power mgmt. operation.
+ ******************************************************************************/
+const spd_pm_ops_t spmc_pm = {
+	.svc_on_finish = spmc_cpu_on_finish_handler,
+	.svc_off = spmc_cpu_off_handler,
+	.svc_suspend = spmc_cpu_suspend_handler,
+	.svc_suspend_finish = spmc_cpu_suspend_finish_handler
+};
diff --git a/services/std_svc/spm/el3_spmc/spmc_setup.c b/services/std_svc/spm/el3_spmc/spmc_setup.c
new file mode 100644
index 0000000..8ebae28
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_setup.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <context.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <libfdt.h>
+#include <plat/common/common_def.h>
+#include <plat/common/platform.h>
+#include <services/ffa_svc.h>
+#include "spm_common.h"
+#include "spmc.h"
+#include <tools_share/firmware_image_package.h>
+
+#include <platform_def.h>
+
+/*
+ * Statically allocate a page of memory for passing boot information to an SP.
+ */
+static uint8_t ffa_boot_info_mem[PAGE_SIZE] __aligned(PAGE_SIZE);
+
+/*
+ * This function creates a initialization descriptor in the memory reserved
+ * for passing boot information to an SP. It then copies the partition manifest
+ * into this region and ensures that its reference in the initialization
+ * descriptor is updated.
+ */
+static void spmc_create_boot_info(entry_point_info_t *ep_info,
+				  struct secure_partition_desc *sp)
+{
+	struct ffa_boot_info_header *boot_header;
+	struct ffa_boot_info_desc *boot_descriptor;
+	uintptr_t manifest_addr;
+
+	/*
+	 * Calculate the maximum size of the manifest that can be accommodated
+	 * in the boot information memory region.
+	 */
+	const unsigned int
+	max_manifest_sz = sizeof(ffa_boot_info_mem) -
+			  (sizeof(struct ffa_boot_info_header) +
+			   sizeof(struct ffa_boot_info_desc));
+
+	/*
+	 * The current implementation only supports the FF-A v1.1
+	 * implementation of the boot protocol, therefore check
+	 * that a v1.0 SP has not requested use of the protocol.
+	 */
+	if (sp->ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		ERROR("FF-A boot protocol not supported for v1.0 clients\n");
+		return;
+	}
+
+	/*
+	 * Check if the manifest will fit into the boot info memory region else
+	 * bail.
+	 */
+	if (ep_info->args.arg1 > max_manifest_sz) {
+		WARN("Unable to copy manifest into boot information. ");
+		WARN("Max sz = %u bytes. Manifest sz = %lu bytes\n",
+		     max_manifest_sz, ep_info->args.arg1);
+		return;
+	}
+
+	/* Zero the memory region before populating. */
+	memset(ffa_boot_info_mem, 0, PAGE_SIZE);
+
+	/*
+	 * Populate the ffa_boot_info_header at the start of the boot info
+	 * region.
+	 */
+	boot_header = (struct ffa_boot_info_header *) ffa_boot_info_mem;
+
+	/* Position the ffa_boot_info_desc after the ffa_boot_info_header. */
+	boot_header->offset_boot_info_desc =
+					sizeof(struct ffa_boot_info_header);
+	boot_descriptor = (struct ffa_boot_info_desc *)
+			  (ffa_boot_info_mem +
+			   boot_header->offset_boot_info_desc);
+
+	/*
+	 * We must use the FF-A version coresponding to the version implemented
+	 * by the SP. Currently this can only be v1.1.
+	 */
+	boot_header->version = sp->ffa_version;
+
+	/* Populate the boot information header. */
+	boot_header->size_boot_info_desc = sizeof(struct ffa_boot_info_desc);
+
+	/* Set the signature "0xFFA". */
+	boot_header->signature = FFA_INIT_DESC_SIGNATURE;
+
+	/* Set the count. Currently 1 since only the manifest is specified. */
+	boot_header->count_boot_info_desc = 1;
+
+	/* Populate the boot information descriptor for the manifest. */
+	boot_descriptor->type =
+		FFA_BOOT_INFO_TYPE(FFA_BOOT_INFO_TYPE_STD) |
+		FFA_BOOT_INFO_TYPE_ID(FFA_BOOT_INFO_TYPE_ID_FDT);
+
+	boot_descriptor->flags =
+		FFA_BOOT_INFO_FLAG_NAME(FFA_BOOT_INFO_FLAG_NAME_UUID) |
+		FFA_BOOT_INFO_FLAG_CONTENT(FFA_BOOT_INFO_FLAG_CONTENT_ADR);
+
+	/*
+	 * Copy the manifest into boot info region after the boot information
+	 * descriptor.
+	 */
+	boot_descriptor->size_boot_info = (uint32_t) ep_info->args.arg1;
+
+	manifest_addr = (uintptr_t) (ffa_boot_info_mem +
+				     boot_header->offset_boot_info_desc +
+				     boot_header->size_boot_info_desc);
+
+	memcpy((void *) manifest_addr, (void *) ep_info->args.arg0,
+	       boot_descriptor->size_boot_info);
+
+	boot_descriptor->content = manifest_addr;
+
+	/* Calculate the size of the total boot info blob. */
+	boot_header->size_boot_info_blob = boot_header->offset_boot_info_desc +
+					   boot_descriptor->size_boot_info +
+					   (boot_header->count_boot_info_desc *
+					    boot_header->size_boot_info_desc);
+
+	INFO("SP boot info @ 0x%lx, size: %u bytes.\n",
+	     (uintptr_t) ffa_boot_info_mem,
+	     boot_header->size_boot_info_blob);
+	INFO("SP manifest @ 0x%lx, size: %u bytes.\n",
+	     boot_descriptor->content,
+	     boot_descriptor->size_boot_info);
+}
+
+/*
+ * We are assuming that the index of the execution
+ * context used is the linear index of the current physical cpu.
+ */
+unsigned int get_ec_index(struct secure_partition_desc *sp)
+{
+	return plat_my_core_pos();
+}
+
+/* S-EL1 partition specific initialisation. */
+void spmc_el1_sp_setup(struct secure_partition_desc *sp,
+		       entry_point_info_t *ep_info)
+{
+	/* Sanity check input arguments. */
+	assert(sp != NULL);
+	assert(ep_info != NULL);
+
+	/* Initialise the SPSR for S-EL1 SPs. */
+	ep_info->spsr =	SPSR_64(MODE_EL1, MODE_SP_ELX,
+				DISABLE_ALL_EXCEPTIONS);
+
+	/*
+	 * TF-A Implementation defined behaviour to provide the linear
+	 * core ID in the x4 register.
+	 */
+	ep_info->args.arg4 = (uintptr_t) plat_my_core_pos();
+
+	/*
+	 * Check whether setup is being performed for the primary or a secondary
+	 * execution context. In the latter case, indicate to the SP that this
+	 * is a warm boot.
+	 * TODO: This check would need to be reworked if the same entry point is
+	 * used for both primary and secondary initialisation.
+	 */
+	if (sp->secondary_ep != 0U) {
+		/*
+		 * Sanity check that the secondary entry point is still what was
+		 * originally set.
+		 */
+		assert(sp->secondary_ep == ep_info->pc);
+		ep_info->args.arg0 = FFA_WB_TYPE_S2RAM;
+	}
+}
+
+/* Common initialisation for all SPs. */
+void spmc_sp_common_setup(struct secure_partition_desc *sp,
+			  entry_point_info_t *ep_info,
+			  int32_t boot_info_reg)
+{
+	uint16_t sp_id;
+
+	/* Assign FF-A Partition ID if not already assigned. */
+	if (sp->sp_id == INV_SP_ID) {
+		sp_id = FFA_SP_ID_BASE + ACTIVE_SP_DESC_INDEX;
+		/*
+		 * Ensure we don't clash with previously assigned partition
+		 * IDs.
+		 */
+		while (!is_ffa_secure_id_valid(sp_id)) {
+			sp_id++;
+
+			if (sp_id == FFA_SWD_ID_LIMIT) {
+				ERROR("Unable to determine valid SP ID.\n");
+				panic();
+			}
+		}
+		sp->sp_id = sp_id;
+	}
+
+	/*
+	 * We currently only support S-EL1 partitions so ensure this is the
+	 * case.
+	 */
+	assert(sp->runtime_el == S_EL1);
+
+	/* Check if the SP wants to use the FF-A boot protocol. */
+	if (boot_info_reg >= 0) {
+		/*
+		 * Create a boot information descriptor and copy the partition
+		 * manifest into the reserved memory region for consumption by
+		 * the SP.
+		 */
+		spmc_create_boot_info(ep_info, sp);
+
+		/*
+		 * We have consumed what we need from ep args so we can now
+		 * zero them before we start populating with new information
+		 * specifically for the SP.
+		 */
+		zeromem(&ep_info->args, sizeof(ep_info->args));
+
+		/*
+		 * Pass the address of the boot information in the
+		 * boot_info_reg.
+		 */
+		switch (boot_info_reg) {
+		case 0:
+			ep_info->args.arg0 = (uintptr_t) ffa_boot_info_mem;
+			break;
+		case 1:
+			ep_info->args.arg1 = (uintptr_t) ffa_boot_info_mem;
+			break;
+		case 2:
+			ep_info->args.arg2 = (uintptr_t) ffa_boot_info_mem;
+			break;
+		case 3:
+			ep_info->args.arg3 = (uintptr_t) ffa_boot_info_mem;
+			break;
+		default:
+			ERROR("Invalid value for \"gp-register-num\" %d.\n",
+			      boot_info_reg);
+		}
+	} else {
+		/*
+		 * We don't need any of the information that was populated
+		 * in ep_args so we can clear them.
+		 */
+		zeromem(&ep_info->args, sizeof(ep_info->args));
+	}
+}
+
+/*
+ * Initialise the SP context now we have populated the common and EL specific
+ * entrypoint information.
+ */
+void spmc_sp_common_ep_commit(struct secure_partition_desc *sp,
+			      entry_point_info_t *ep_info)
+{
+	cpu_context_t *cpu_ctx;
+
+	cpu_ctx = &(spmc_get_sp_ec(sp)->cpu_ctx);
+	print_entry_point_info(ep_info);
+	cm_setup_context(cpu_ctx, ep_info);
+}
diff --git a/services/std_svc/spm/el3_spmc/spmc_shared_mem.c b/services/std_svc/spm/el3_spmc/spmc_shared_mem.c
new file mode 100644
index 0000000..89d7b31
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_shared_mem.c
@@ -0,0 +1,1861 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <assert.h>
+#include <errno.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/object_pool.h>
+#include <lib/spinlock.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <services/ffa_svc.h>
+#include "spmc.h"
+#include "spmc_shared_mem.h"
+
+#include <platform_def.h>
+
+/**
+ * struct spmc_shmem_obj - Shared memory object.
+ * @desc_size:      Size of @desc.
+ * @desc_filled:    Size of @desc already received.
+ * @in_use:         Number of clients that have called ffa_mem_retrieve_req
+ *                  without a matching ffa_mem_relinquish call.
+ * @desc:           FF-A memory region descriptor passed in ffa_mem_share.
+ */
+struct spmc_shmem_obj {
+	size_t desc_size;
+	size_t desc_filled;
+	size_t in_use;
+	struct ffa_mtd desc;
+};
+
+/*
+ * Declare our data structure to store the metadata of memory share requests.
+ * The main datastore is allocated on a per platform basis to ensure enough
+ * storage can be made available.
+ * The address of the data store will be populated by the SPMC during its
+ * initialization.
+ */
+
+struct spmc_shmem_obj_state spmc_shmem_obj_state = {
+	/* Set start value for handle so top 32 bits are needed quickly. */
+	.next_handle = 0xffffffc0U,
+};
+
+/**
+ * spmc_shmem_obj_size - Convert from descriptor size to object size.
+ * @desc_size:  Size of struct ffa_memory_region_descriptor object.
+ *
+ * Return: Size of struct spmc_shmem_obj object.
+ */
+static size_t spmc_shmem_obj_size(size_t desc_size)
+{
+	return desc_size + offsetof(struct spmc_shmem_obj, desc);
+}
+
+/**
+ * spmc_shmem_obj_alloc - Allocate struct spmc_shmem_obj.
+ * @state:      Global state.
+ * @desc_size:  Size of struct ffa_memory_region_descriptor object that
+ *              allocated object will hold.
+ *
+ * Return: Pointer to newly allocated object, or %NULL if there not enough space
+ *         left. The returned pointer is only valid while @state is locked, to
+ *         used it again after unlocking @state, spmc_shmem_obj_lookup must be
+ *         called.
+ */
+static struct spmc_shmem_obj *
+spmc_shmem_obj_alloc(struct spmc_shmem_obj_state *state, size_t desc_size)
+{
+	struct spmc_shmem_obj *obj;
+	size_t free = state->data_size - state->allocated;
+	size_t obj_size;
+
+	if (state->data == NULL) {
+		ERROR("Missing shmem datastore!\n");
+		return NULL;
+	}
+
+	obj_size = spmc_shmem_obj_size(desc_size);
+
+	/* Ensure the obj size has not overflowed. */
+	if (obj_size < desc_size) {
+		WARN("%s(0x%zx) desc_size overflow\n",
+		     __func__, desc_size);
+		return NULL;
+	}
+
+	if (obj_size > free) {
+		WARN("%s(0x%zx) failed, free 0x%zx\n",
+		     __func__, desc_size, free);
+		return NULL;
+	}
+	obj = (struct spmc_shmem_obj *)(state->data + state->allocated);
+	obj->desc = (struct ffa_mtd) {0};
+	obj->desc_size = desc_size;
+	obj->desc_filled = 0;
+	obj->in_use = 0;
+	state->allocated += obj_size;
+	return obj;
+}
+
+/**
+ * spmc_shmem_obj_free - Free struct spmc_shmem_obj.
+ * @state:      Global state.
+ * @obj:        Object to free.
+ *
+ * Release memory used by @obj. Other objects may move, so on return all
+ * pointers to struct spmc_shmem_obj object should be considered invalid, not
+ * just @obj.
+ *
+ * The current implementation always compacts the remaining objects to simplify
+ * the allocator and to avoid fragmentation.
+ */
+
+static void spmc_shmem_obj_free(struct spmc_shmem_obj_state *state,
+				  struct spmc_shmem_obj *obj)
+{
+	size_t free_size = spmc_shmem_obj_size(obj->desc_size);
+	uint8_t *shift_dest = (uint8_t *)obj;
+	uint8_t *shift_src = shift_dest + free_size;
+	size_t shift_size = state->allocated - (shift_src - state->data);
+
+	if (shift_size != 0U) {
+		memmove(shift_dest, shift_src, shift_size);
+	}
+	state->allocated -= free_size;
+}
+
+/**
+ * spmc_shmem_obj_lookup - Lookup struct spmc_shmem_obj by handle.
+ * @state:      Global state.
+ * @handle:     Unique handle of object to return.
+ *
+ * Return: struct spmc_shmem_obj_state object with handle matching @handle.
+ *         %NULL, if not object in @state->data has a matching handle.
+ */
+static struct spmc_shmem_obj *
+spmc_shmem_obj_lookup(struct spmc_shmem_obj_state *state, uint64_t handle)
+{
+	uint8_t *curr = state->data;
+
+	while (curr - state->data < state->allocated) {
+		struct spmc_shmem_obj *obj = (struct spmc_shmem_obj *)curr;
+
+		if (obj->desc.handle == handle) {
+			return obj;
+		}
+		curr += spmc_shmem_obj_size(obj->desc_size);
+	}
+	return NULL;
+}
+
+/**
+ * spmc_shmem_obj_get_next - Get the next memory object from an offset.
+ * @offset:     Offset used to track which objects have previously been
+ *              returned.
+ *
+ * Return: the next struct spmc_shmem_obj_state object from the provided
+ *	   offset.
+ *	   %NULL, if there are no more objects.
+ */
+static struct spmc_shmem_obj *
+spmc_shmem_obj_get_next(struct spmc_shmem_obj_state *state, size_t *offset)
+{
+	uint8_t *curr = state->data + *offset;
+
+	if (curr - state->data < state->allocated) {
+		struct spmc_shmem_obj *obj = (struct spmc_shmem_obj *)curr;
+
+		*offset += spmc_shmem_obj_size(obj->desc_size);
+
+		return obj;
+	}
+	return NULL;
+}
+
+/*******************************************************************************
+ * FF-A memory descriptor helper functions.
+ ******************************************************************************/
+/**
+ * spmc_shmem_obj_get_emad - Get the emad from a given index depending on the
+ *                           clients FF-A version.
+ * @desc:         The memory transaction descriptor.
+ * @index:        The index of the emad element to be accessed.
+ * @ffa_version:  FF-A version of the provided structure.
+ * @emad_size:    Will be populated with the size of the returned emad
+ *                descriptor.
+ * Return: A pointer to the requested emad structure.
+ */
+static void *
+spmc_shmem_obj_get_emad(const struct ffa_mtd *desc, uint32_t index,
+			uint32_t ffa_version, size_t *emad_size)
+{
+	uint8_t *emad;
+	/*
+	 * If the caller is using FF-A v1.0 interpret the descriptor as a v1.0
+	 * format, otherwise assume it is a v1.1 format.
+	 */
+	if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		/* Cast our descriptor to the v1.0 format. */
+		struct ffa_mtd_v1_0 *mtd_v1_0 =
+					(struct ffa_mtd_v1_0 *) desc;
+		emad = (uint8_t *)  &(mtd_v1_0->emad);
+		*emad_size = sizeof(struct ffa_emad_v1_0);
+	} else {
+		if (!is_aligned(desc->emad_offset, 16)) {
+			WARN("Emad offset is not aligned.\n");
+			return NULL;
+		}
+		emad = ((uint8_t *) desc + desc->emad_offset);
+		*emad_size = desc->emad_size;
+	}
+	return (emad + (*emad_size * index));
+}
+
+/**
+ * spmc_shmem_obj_get_comp_mrd - Get comp_mrd from a mtd struct based on the
+ *				 FF-A version of the descriptor.
+ * @obj:    Object containing ffa_memory_region_descriptor.
+ *
+ * Return: struct ffa_comp_mrd object corresponding to the composite memory
+ *	   region descriptor.
+ */
+static struct ffa_comp_mrd *
+spmc_shmem_obj_get_comp_mrd(struct spmc_shmem_obj *obj, uint32_t ffa_version)
+{
+	size_t emad_size;
+	/*
+	 * The comp_mrd_offset field of the emad descriptor remains consistent
+	 * between FF-A versions therefore we can use the v1.0 descriptor here
+	 * in all cases.
+	 */
+	struct ffa_emad_v1_0 *emad = spmc_shmem_obj_get_emad(&obj->desc, 0,
+							     ffa_version,
+							     &emad_size);
+	/* Ensure the emad array was found. */
+	if (emad == NULL) {
+		return NULL;
+	}
+
+	/* Ensure the composite descriptor offset is aligned. */
+	if (!is_aligned(emad->comp_mrd_offset, 8)) {
+		WARN("Unaligned composite memory region descriptor offset.\n");
+		return NULL;
+	}
+
+	return (struct ffa_comp_mrd *)
+	       ((uint8_t *)(&obj->desc) + emad->comp_mrd_offset);
+}
+
+/**
+ * spmc_shmem_obj_ffa_constituent_size - Calculate variable size part of obj.
+ * @obj:    Object containing ffa_memory_region_descriptor.
+ *
+ * Return: Size of ffa_constituent_memory_region_descriptors in @obj.
+ */
+static size_t
+spmc_shmem_obj_ffa_constituent_size(struct spmc_shmem_obj *obj,
+				    uint32_t ffa_version)
+{
+	struct ffa_comp_mrd *comp_mrd;
+
+	comp_mrd = spmc_shmem_obj_get_comp_mrd(obj, ffa_version);
+	if (comp_mrd == NULL) {
+		return 0;
+	}
+	return comp_mrd->address_range_count * sizeof(struct ffa_cons_mrd);
+}
+
+/**
+ * spmc_shmem_obj_validate_id - Validate a partition ID is participating in
+ *				a given memory transaction.
+ * @sp_id:      Partition ID to validate.
+ * @desc:       Descriptor of the memory transaction.
+ *
+ * Return: true if ID is valid, else false.
+ */
+bool spmc_shmem_obj_validate_id(const struct ffa_mtd *desc, uint16_t sp_id)
+{
+	bool found = false;
+
+	/* Validate the partition is a valid participant. */
+	for (unsigned int i = 0U; i < desc->emad_count; i++) {
+		size_t emad_size;
+		struct ffa_emad_v1_0 *emad;
+
+		emad = spmc_shmem_obj_get_emad(desc, i,
+					       MAKE_FFA_VERSION(1, 1),
+					       &emad_size);
+		if (sp_id == emad->mapd.endpoint_id) {
+			found = true;
+			break;
+		}
+	}
+	return found;
+}
+
+/*
+ * Compare two memory regions to determine if any range overlaps with another
+ * ongoing memory transaction.
+ */
+static bool
+overlapping_memory_regions(struct ffa_comp_mrd *region1,
+			   struct ffa_comp_mrd *region2)
+{
+	uint64_t region1_start;
+	uint64_t region1_size;
+	uint64_t region1_end;
+	uint64_t region2_start;
+	uint64_t region2_size;
+	uint64_t region2_end;
+
+	assert(region1 != NULL);
+	assert(region2 != NULL);
+
+	if (region1 == region2) {
+		return true;
+	}
+
+	/*
+	 * Check each memory region in the request against existing
+	 * transactions.
+	 */
+	for (size_t i = 0; i < region1->address_range_count; i++) {
+
+		region1_start = region1->address_range_array[i].address;
+		region1_size =
+			region1->address_range_array[i].page_count *
+			PAGE_SIZE_4KB;
+		region1_end = region1_start + region1_size;
+
+		for (size_t j = 0; j < region2->address_range_count; j++) {
+
+			region2_start = region2->address_range_array[j].address;
+			region2_size =
+				region2->address_range_array[j].page_count *
+				PAGE_SIZE_4KB;
+			region2_end = region2_start + region2_size;
+
+			/* Check if regions are not overlapping. */
+			if (!((region2_end <= region1_start) ||
+			      (region1_end <= region2_start))) {
+				WARN("Overlapping mem regions 0x%lx-0x%lx & 0x%lx-0x%lx\n",
+				     region1_start, region1_end,
+				     region2_start, region2_end);
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
+/*******************************************************************************
+ * FF-A v1.0 Memory Descriptor Conversion Helpers.
+ ******************************************************************************/
+/**
+ * spmc_shm_get_v1_1_descriptor_size - Calculate the required size for a v1.1
+ *                                     converted descriptor.
+ * @orig:       The original v1.0 memory transaction descriptor.
+ * @desc_size:  The size of the original v1.0 memory transaction descriptor.
+ *
+ * Return: the size required to store the descriptor store in the v1.1 format.
+ */
+static size_t
+spmc_shm_get_v1_1_descriptor_size(struct ffa_mtd_v1_0 *orig, size_t desc_size)
+{
+	size_t size = 0;
+	struct ffa_comp_mrd *mrd;
+	struct ffa_emad_v1_0 *emad_array = orig->emad;
+
+	/* Get the size of the v1.1 descriptor. */
+	size += sizeof(struct ffa_mtd);
+
+	/* Add the size of the emad descriptors. */
+	size += orig->emad_count * sizeof(struct ffa_emad_v1_0);
+
+	/* Add the size of the composite mrds. */
+	size += sizeof(struct ffa_comp_mrd);
+
+	/* Add the size of the constituent mrds. */
+	mrd = (struct ffa_comp_mrd *) ((uint8_t *) orig +
+	      emad_array[0].comp_mrd_offset);
+
+	/* Check the calculated address is within the memory descriptor. */
+	if ((uintptr_t) mrd >= (uintptr_t)((uint8_t *) orig + desc_size)) {
+		return 0;
+	}
+	size += mrd->address_range_count * sizeof(struct ffa_cons_mrd);
+
+	return size;
+}
+
+/**
+ * spmc_shm_get_v1_0_descriptor_size - Calculate the required size for a v1.0
+ *                                     converted descriptor.
+ * @orig:       The original v1.1 memory transaction descriptor.
+ * @desc_size:  The size of the original v1.1 memory transaction descriptor.
+ *
+ * Return: the size required to store the descriptor store in the v1.0 format.
+ */
+static size_t
+spmc_shm_get_v1_0_descriptor_size(struct ffa_mtd *orig, size_t desc_size)
+{
+	size_t size = 0;
+	struct ffa_comp_mrd *mrd;
+	struct ffa_emad_v1_0 *emad_array = (struct ffa_emad_v1_0 *)
+					   ((uint8_t *) orig +
+					    orig->emad_offset);
+
+	/* Get the size of the v1.0 descriptor. */
+	size += sizeof(struct ffa_mtd_v1_0);
+
+	/* Add the size of the v1.0 emad descriptors. */
+	size += orig->emad_count * sizeof(struct ffa_emad_v1_0);
+
+	/* Add the size of the composite mrds. */
+	size += sizeof(struct ffa_comp_mrd);
+
+	/* Add the size of the constituent mrds. */
+	mrd = (struct ffa_comp_mrd *) ((uint8_t *) orig +
+	      emad_array[0].comp_mrd_offset);
+
+	/* Check the calculated address is within the memory descriptor. */
+	if ((uintptr_t) mrd >= (uintptr_t)((uint8_t *) orig + desc_size)) {
+		return 0;
+	}
+	size += mrd->address_range_count * sizeof(struct ffa_cons_mrd);
+
+	return size;
+}
+
+/**
+ * spmc_shm_convert_shmem_obj_from_v1_0 - Converts a given v1.0 memory object.
+ * @out_obj:	The shared memory object to populate the converted descriptor.
+ * @orig:	The shared memory object containing the v1.0 descriptor.
+ *
+ * Return: true if the conversion is successful else false.
+ */
+static bool
+spmc_shm_convert_shmem_obj_from_v1_0(struct spmc_shmem_obj *out_obj,
+				     struct spmc_shmem_obj *orig)
+{
+	struct ffa_mtd_v1_0 *mtd_orig = (struct ffa_mtd_v1_0 *) &orig->desc;
+	struct ffa_mtd *out = &out_obj->desc;
+	struct ffa_emad_v1_0 *emad_array_in;
+	struct ffa_emad_v1_0 *emad_array_out;
+	struct ffa_comp_mrd *mrd_in;
+	struct ffa_comp_mrd *mrd_out;
+
+	size_t mrd_in_offset;
+	size_t mrd_out_offset;
+	size_t mrd_size = 0;
+
+	/* Populate the new descriptor format from the v1.0 struct. */
+	out->sender_id = mtd_orig->sender_id;
+	out->memory_region_attributes = mtd_orig->memory_region_attributes;
+	out->flags = mtd_orig->flags;
+	out->handle = mtd_orig->handle;
+	out->tag = mtd_orig->tag;
+	out->emad_count = mtd_orig->emad_count;
+	out->emad_size = sizeof(struct ffa_emad_v1_0);
+
+	/*
+	 * We will locate the emad descriptors directly after the ffa_mtd
+	 * struct. This will be 8-byte aligned.
+	 */
+	out->emad_offset = sizeof(struct ffa_mtd);
+
+	emad_array_in = mtd_orig->emad;
+	emad_array_out = (struct ffa_emad_v1_0 *)
+			 ((uint8_t *) out + out->emad_offset);
+
+	/* Copy across the emad structs. */
+	for (unsigned int i = 0U; i < out->emad_count; i++) {
+		memcpy(&emad_array_out[i], &emad_array_in[i],
+		       sizeof(struct ffa_emad_v1_0));
+	}
+
+	/* Place the mrd descriptors after the end of the emad descriptors.*/
+	mrd_in_offset = emad_array_in->comp_mrd_offset;
+	mrd_out_offset = out->emad_offset + (out->emad_size * out->emad_count);
+	mrd_out = (struct ffa_comp_mrd *) ((uint8_t *) out + mrd_out_offset);
+
+	/* Add the size of the composite memory region descriptor. */
+	mrd_size += sizeof(struct ffa_comp_mrd);
+
+	/* Find the mrd descriptor. */
+	mrd_in = (struct ffa_comp_mrd *) ((uint8_t *) mtd_orig + mrd_in_offset);
+
+	/* Add the size of the constituent memory region descriptors. */
+	mrd_size += mrd_in->address_range_count * sizeof(struct ffa_cons_mrd);
+
+	/*
+	 * Update the offset in the emads by the delta between the input and
+	 * output addresses.
+	 */
+	for (unsigned int i = 0U; i < out->emad_count; i++) {
+		emad_array_out[i].comp_mrd_offset =
+			emad_array_in[i].comp_mrd_offset +
+			(mrd_out_offset - mrd_in_offset);
+	}
+
+	/* Verify that we stay within bound of the memory descriptors. */
+	if ((uintptr_t)((uint8_t *) mrd_in + mrd_size) >
+	     (uintptr_t)((uint8_t *) mtd_orig + orig->desc_size) ||
+	    ((uintptr_t)((uint8_t *) mrd_out + mrd_size) >
+	     (uintptr_t)((uint8_t *) out + out_obj->desc_size))) {
+		ERROR("%s: Invalid mrd structure.\n", __func__);
+		return false;
+	}
+
+	/* Copy the mrd descriptors directly. */
+	memcpy(mrd_out, mrd_in, mrd_size);
+
+	return true;
+}
+
+/**
+ * spmc_shm_convert_mtd_to_v1_0 - Converts a given v1.1 memory object to
+ *                                v1.0 memory object.
+ * @out_obj:    The shared memory object to populate the v1.0 descriptor.
+ * @orig:       The shared memory object containing the v1.1 descriptor.
+ *
+ * Return: true if the conversion is successful else false.
+ */
+static bool
+spmc_shm_convert_mtd_to_v1_0(struct spmc_shmem_obj *out_obj,
+			     struct spmc_shmem_obj *orig)
+{
+	struct ffa_mtd *mtd_orig = &orig->desc;
+	struct ffa_mtd_v1_0 *out = (struct ffa_mtd_v1_0 *) &out_obj->desc;
+	struct ffa_emad_v1_0 *emad_in;
+	struct ffa_emad_v1_0 *emad_array_in;
+	struct ffa_emad_v1_0 *emad_array_out;
+	struct ffa_comp_mrd *mrd_in;
+	struct ffa_comp_mrd *mrd_out;
+
+	size_t mrd_in_offset;
+	size_t mrd_out_offset;
+	size_t emad_out_array_size;
+	size_t mrd_size = 0;
+
+	/* Populate the v1.0 descriptor format from the v1.1 struct. */
+	out->sender_id = mtd_orig->sender_id;
+	out->memory_region_attributes = mtd_orig->memory_region_attributes;
+	out->flags = mtd_orig->flags;
+	out->handle = mtd_orig->handle;
+	out->tag = mtd_orig->tag;
+	out->emad_count = mtd_orig->emad_count;
+
+	/* Determine the location of the emad array in both descriptors. */
+	emad_array_in = (struct ffa_emad_v1_0 *)
+			((uint8_t *) mtd_orig + mtd_orig->emad_offset);
+	emad_array_out = out->emad;
+
+	/* Copy across the emad structs. */
+	emad_in = emad_array_in;
+	for (unsigned int i = 0U; i < out->emad_count; i++) {
+		memcpy(&emad_array_out[i], emad_in,
+		       sizeof(struct ffa_emad_v1_0));
+
+		emad_in +=  mtd_orig->emad_size;
+	}
+
+	/* Place the mrd descriptors after the end of the emad descriptors. */
+	emad_out_array_size = sizeof(struct ffa_emad_v1_0) * out->emad_count;
+
+	mrd_out_offset =  (uint8_t *) out->emad - (uint8_t *) out +
+			  emad_out_array_size;
+
+	mrd_out = (struct ffa_comp_mrd *) ((uint8_t *) out + mrd_out_offset);
+
+	mrd_in_offset = mtd_orig->emad_offset +
+			(mtd_orig->emad_size * mtd_orig->emad_count);
+
+	/* Add the size of the composite memory region descriptor. */
+	mrd_size += sizeof(struct ffa_comp_mrd);
+
+	/* Find the mrd descriptor. */
+	mrd_in = (struct ffa_comp_mrd *) ((uint8_t *) mtd_orig + mrd_in_offset);
+
+	/* Add the size of the constituent memory region descriptors. */
+	mrd_size += mrd_in->address_range_count * sizeof(struct ffa_cons_mrd);
+
+	/*
+	 * Update the offset in the emads by the delta between the input and
+	 * output addresses.
+	 */
+	emad_in = emad_array_in;
+
+	for (unsigned int i = 0U; i < out->emad_count; i++) {
+		emad_array_out[i].comp_mrd_offset = emad_in->comp_mrd_offset +
+						    (mrd_out_offset -
+						     mrd_in_offset);
+		emad_in +=  mtd_orig->emad_size;
+	}
+
+	/* Verify that we stay within bound of the memory descriptors. */
+	if ((uintptr_t)((uint8_t *) mrd_in + mrd_size) >
+	     (uintptr_t)((uint8_t *) mtd_orig + orig->desc_size) ||
+	    ((uintptr_t)((uint8_t *) mrd_out + mrd_size) >
+	     (uintptr_t)((uint8_t *) out + out_obj->desc_size))) {
+		ERROR("%s: Invalid mrd structure.\n", __func__);
+		return false;
+	}
+
+	/* Copy the mrd descriptors directly. */
+	memcpy(mrd_out, mrd_in, mrd_size);
+
+	return true;
+}
+
+/**
+ * spmc_populate_ffa_v1_0_descriptor - Converts a given v1.1 memory object to
+ *                                     the v1.0 format and populates the
+ *                                     provided buffer.
+ * @dst:	    Buffer to populate v1.0 ffa_memory_region_descriptor.
+ * @orig_obj:	    Object containing v1.1 ffa_memory_region_descriptor.
+ * @buf_size:	    Size of the buffer to populate.
+ * @offset:	    The offset of the converted descriptor to copy.
+ * @copy_size:	    Will be populated with the number of bytes copied.
+ * @out_desc_size:  Will be populated with the total size of the v1.0
+ *                  descriptor.
+ *
+ * Return: 0 if conversion and population succeeded.
+ * Note: This function invalidates the reference to @orig therefore
+ * `spmc_shmem_obj_lookup` must be called if further usage is required.
+ */
+static uint32_t
+spmc_populate_ffa_v1_0_descriptor(void *dst, struct spmc_shmem_obj *orig_obj,
+				 size_t buf_size, size_t offset,
+				 size_t *copy_size, size_t *v1_0_desc_size)
+{
+		struct spmc_shmem_obj *v1_0_obj;
+
+		/* Calculate the size that the v1.0 descriptor will require. */
+		*v1_0_desc_size = spmc_shm_get_v1_0_descriptor_size(
+					&orig_obj->desc, orig_obj->desc_size);
+
+		if (*v1_0_desc_size == 0) {
+			ERROR("%s: cannot determine size of descriptor.\n",
+			      __func__);
+			return FFA_ERROR_INVALID_PARAMETER;
+		}
+
+		/* Get a new obj to store the v1.0 descriptor. */
+		v1_0_obj = spmc_shmem_obj_alloc(&spmc_shmem_obj_state,
+						*v1_0_desc_size);
+
+		if (!v1_0_obj) {
+			return FFA_ERROR_NO_MEMORY;
+		}
+
+		/* Perform the conversion from v1.1 to v1.0. */
+		if (!spmc_shm_convert_mtd_to_v1_0(v1_0_obj, orig_obj)) {
+			spmc_shmem_obj_free(&spmc_shmem_obj_state, v1_0_obj);
+			return FFA_ERROR_INVALID_PARAMETER;
+		}
+
+		*copy_size = MIN(v1_0_obj->desc_size - offset, buf_size);
+		memcpy(dst, (uint8_t *) &v1_0_obj->desc + offset, *copy_size);
+
+		/*
+		 * We're finished with the v1.0 descriptor for now so free it.
+		 * Note that this will invalidate any references to the v1.1
+		 * descriptor.
+		 */
+		spmc_shmem_obj_free(&spmc_shmem_obj_state, v1_0_obj);
+
+		return 0;
+}
+
+/**
+ * spmc_shmem_check_obj - Check that counts in descriptor match overall size.
+ * @obj:	  Object containing ffa_memory_region_descriptor.
+ * @ffa_version:  FF-A version of the provided descriptor.
+ *
+ * Return: 0 if object is valid, -EINVAL if constituent_memory_region_descriptor
+ * offset or count is invalid.
+ */
+static int spmc_shmem_check_obj(struct spmc_shmem_obj *obj,
+				uint32_t ffa_version)
+{
+	uint32_t comp_mrd_offset = 0;
+
+	if (obj->desc.emad_count == 0U) {
+		WARN("%s: unsupported attribute desc count %u.\n",
+		     __func__, obj->desc.emad_count);
+		return -EINVAL;
+	}
+
+	for (size_t emad_num = 0; emad_num < obj->desc.emad_count; emad_num++) {
+		size_t size;
+		size_t count;
+		size_t expected_size;
+		size_t total_page_count;
+		size_t emad_size;
+		size_t desc_size;
+		size_t header_emad_size;
+		uint32_t offset;
+		struct ffa_comp_mrd *comp;
+		struct ffa_emad_v1_0 *emad;
+
+		emad = spmc_shmem_obj_get_emad(&obj->desc, emad_num,
+					       ffa_version, &emad_size);
+		if (emad == NULL) {
+			WARN("%s: invalid emad structure.\n", __func__);
+			return -EINVAL;
+		}
+
+		/*
+		 * Validate the calculated emad address resides within the
+		 * descriptor.
+		 */
+		if ((uintptr_t) emad >=
+		    (uintptr_t)((uint8_t *) &obj->desc + obj->desc_size)) {
+			WARN("Invalid emad access.\n");
+			return -EINVAL;
+		}
+
+		offset = emad->comp_mrd_offset;
+
+		if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+			desc_size =  sizeof(struct ffa_mtd_v1_0);
+		} else {
+			desc_size =  sizeof(struct ffa_mtd);
+		}
+
+		header_emad_size = desc_size +
+			(obj->desc.emad_count * emad_size);
+
+		if (offset < header_emad_size) {
+			WARN("%s: invalid object, offset %u < header + emad %zu\n",
+			     __func__, offset, header_emad_size);
+			return -EINVAL;
+		}
+
+		size = obj->desc_size;
+
+		if (offset > size) {
+			WARN("%s: invalid object, offset %u > total size %zu\n",
+			     __func__, offset, obj->desc_size);
+			return -EINVAL;
+		}
+		size -= offset;
+
+		if (size < sizeof(struct ffa_comp_mrd)) {
+			WARN("%s: invalid object, offset %u, total size %zu, no header space.\n",
+			     __func__, offset, obj->desc_size);
+			return -EINVAL;
+		}
+		size -= sizeof(struct ffa_comp_mrd);
+
+		count = size / sizeof(struct ffa_cons_mrd);
+
+		comp = spmc_shmem_obj_get_comp_mrd(obj, ffa_version);
+
+		if (comp == NULL) {
+			WARN("%s: invalid comp_mrd offset\n", __func__);
+			return -EINVAL;
+		}
+
+		if (comp->address_range_count != count) {
+			WARN("%s: invalid object, desc count %u != %zu\n",
+			     __func__, comp->address_range_count, count);
+			return -EINVAL;
+		}
+
+		expected_size = offset + sizeof(*comp) +
+				spmc_shmem_obj_ffa_constituent_size(obj,
+								    ffa_version);
+
+		if (expected_size != obj->desc_size) {
+			WARN("%s: invalid object, computed size %zu != size %zu\n",
+			       __func__, expected_size, obj->desc_size);
+			return -EINVAL;
+		}
+
+		if (obj->desc_filled < obj->desc_size) {
+			/*
+			 * The whole descriptor has not yet been received.
+			 * Skip final checks.
+			 */
+			return 0;
+		}
+
+		/*
+		 * The offset provided to the composite memory region descriptor
+		 * should be consistent across endpoint descriptors. Store the
+		 * first entry and compare against subsequent entries.
+		 */
+		if (comp_mrd_offset == 0) {
+			comp_mrd_offset = offset;
+		} else {
+			if (comp_mrd_offset != offset) {
+				ERROR("%s: mismatching offsets provided, %u != %u\n",
+				       __func__, offset, comp_mrd_offset);
+				return -EINVAL;
+			}
+		}
+
+		total_page_count = 0;
+
+		for (size_t i = 0; i < count; i++) {
+			total_page_count +=
+				comp->address_range_array[i].page_count;
+		}
+		if (comp->total_page_count != total_page_count) {
+			WARN("%s: invalid object, desc total_page_count %u != %zu\n",
+			     __func__, comp->total_page_count,
+			total_page_count);
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+/**
+ * spmc_shmem_check_state_obj - Check if the descriptor describes memory
+ *				regions that are currently involved with an
+ *				existing memory transactions. This implies that
+ *				the memory is not in a valid state for lending.
+ * @obj:    Object containing ffa_memory_region_descriptor.
+ *
+ * Return: 0 if object is valid, -EINVAL if invalid memory state.
+ */
+static int spmc_shmem_check_state_obj(struct spmc_shmem_obj *obj,
+				      uint32_t ffa_version)
+{
+	size_t obj_offset = 0;
+	struct spmc_shmem_obj *inflight_obj;
+
+	struct ffa_comp_mrd *other_mrd;
+	struct ffa_comp_mrd *requested_mrd = spmc_shmem_obj_get_comp_mrd(obj,
+								  ffa_version);
+
+	if (requested_mrd == NULL) {
+		return -EINVAL;
+	}
+
+	inflight_obj = spmc_shmem_obj_get_next(&spmc_shmem_obj_state,
+					       &obj_offset);
+
+	while (inflight_obj != NULL) {
+		/*
+		 * Don't compare the transaction to itself or to partially
+		 * transmitted descriptors.
+		 */
+		if ((obj->desc.handle != inflight_obj->desc.handle) &&
+		    (obj->desc_size == obj->desc_filled)) {
+			other_mrd = spmc_shmem_obj_get_comp_mrd(inflight_obj,
+							  FFA_VERSION_COMPILED);
+			if (other_mrd == NULL) {
+				return -EINVAL;
+			}
+			if (overlapping_memory_regions(requested_mrd,
+						       other_mrd)) {
+				return -EINVAL;
+			}
+		}
+
+		inflight_obj = spmc_shmem_obj_get_next(&spmc_shmem_obj_state,
+						       &obj_offset);
+	}
+	return 0;
+}
+
+static long spmc_ffa_fill_desc(struct mailbox *mbox,
+			       struct spmc_shmem_obj *obj,
+			       uint32_t fragment_length,
+			       ffa_mtd_flag32_t mtd_flag,
+			       uint32_t ffa_version,
+			       void *smc_handle)
+{
+	int ret;
+	size_t emad_size;
+	uint32_t handle_low;
+	uint32_t handle_high;
+	struct ffa_emad_v1_0 *emad;
+	struct ffa_emad_v1_0 *other_emad;
+
+	if (mbox->rxtx_page_count == 0U) {
+		WARN("%s: buffer pair not registered.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_arg;
+	}
+
+	if (fragment_length > mbox->rxtx_page_count * PAGE_SIZE_4KB) {
+		WARN("%s: bad fragment size %u > %u buffer size\n", __func__,
+		     fragment_length, mbox->rxtx_page_count * PAGE_SIZE_4KB);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_arg;
+	}
+
+	if (fragment_length > obj->desc_size - obj->desc_filled) {
+		WARN("%s: bad fragment size %u > %zu remaining\n", __func__,
+		     fragment_length, obj->desc_size - obj->desc_filled);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_arg;
+	}
+
+	memcpy((uint8_t *)&obj->desc + obj->desc_filled,
+	       (uint8_t *) mbox->tx_buffer, fragment_length);
+
+	/* Ensure that the sender ID resides in the normal world. */
+	if (ffa_is_secure_world_id(obj->desc.sender_id)) {
+		WARN("%s: Invalid sender ID 0x%x.\n",
+		     __func__, obj->desc.sender_id);
+		ret = FFA_ERROR_DENIED;
+		goto err_arg;
+	}
+
+	/* Ensure the NS bit is set to 0. */
+	if ((obj->desc.memory_region_attributes & FFA_MEM_ATTR_NS_BIT) != 0U) {
+		WARN("%s: NS mem attributes flags MBZ.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_arg;
+	}
+
+	/*
+	 * We don't currently support any optional flags so ensure none are
+	 * requested.
+	 */
+	if (obj->desc.flags != 0U && mtd_flag != 0U &&
+	    (obj->desc.flags != mtd_flag)) {
+		WARN("%s: invalid memory transaction flags %u != %u\n",
+		     __func__, obj->desc.flags, mtd_flag);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_arg;
+	}
+
+	if (obj->desc_filled == 0U) {
+		/* First fragment, descriptor header has been copied */
+		obj->desc.handle = spmc_shmem_obj_state.next_handle++;
+		obj->desc.flags |= mtd_flag;
+	}
+
+	obj->desc_filled += fragment_length;
+	ret = spmc_shmem_check_obj(obj, ffa_version);
+	if (ret != 0) {
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_bad_desc;
+	}
+
+	handle_low = (uint32_t)obj->desc.handle;
+	handle_high = obj->desc.handle >> 32;
+
+	if (obj->desc_filled != obj->desc_size) {
+		SMC_RET8(smc_handle, FFA_MEM_FRAG_RX, handle_low,
+			 handle_high, obj->desc_filled,
+			 (uint32_t)obj->desc.sender_id << 16, 0, 0, 0);
+	}
+
+	/* The full descriptor has been received, perform any final checks. */
+
+	/*
+	 * If a partition ID resides in the secure world validate that the
+	 * partition ID is for a known partition. Ignore any partition ID
+	 * belonging to the normal world as it is assumed the Hypervisor will
+	 * have validated these.
+	 */
+	for (size_t i = 0; i < obj->desc.emad_count; i++) {
+		emad = spmc_shmem_obj_get_emad(&obj->desc, i, ffa_version,
+					       &emad_size);
+		if (emad == NULL) {
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_bad_desc;
+		}
+
+		ffa_endpoint_id16_t ep_id = emad->mapd.endpoint_id;
+
+		if (ffa_is_secure_world_id(ep_id)) {
+			if (spmc_get_sp_ctx(ep_id) == NULL) {
+				WARN("%s: Invalid receiver id 0x%x\n",
+				     __func__, ep_id);
+				ret = FFA_ERROR_INVALID_PARAMETER;
+				goto err_bad_desc;
+			}
+		}
+	}
+
+	/* Ensure partition IDs are not duplicated. */
+	for (size_t i = 0; i < obj->desc.emad_count; i++) {
+		emad = spmc_shmem_obj_get_emad(&obj->desc, i, ffa_version,
+					       &emad_size);
+		if (emad == NULL) {
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_bad_desc;
+		}
+		for (size_t j = i + 1; j < obj->desc.emad_count; j++) {
+			other_emad = spmc_shmem_obj_get_emad(&obj->desc, j,
+							     ffa_version,
+							     &emad_size);
+			if (other_emad == NULL) {
+				ret = FFA_ERROR_INVALID_PARAMETER;
+				goto err_bad_desc;
+			}
+
+			if (emad->mapd.endpoint_id ==
+				other_emad->mapd.endpoint_id) {
+				WARN("%s: Duplicated endpoint id 0x%x\n",
+				     __func__, emad->mapd.endpoint_id);
+				ret = FFA_ERROR_INVALID_PARAMETER;
+				goto err_bad_desc;
+			}
+		}
+	}
+
+	ret = spmc_shmem_check_state_obj(obj, ffa_version);
+	if (ret) {
+		ERROR("%s: invalid memory region descriptor.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_bad_desc;
+	}
+
+	/*
+	 * Everything checks out, if the sender was using FF-A v1.0, convert
+	 * the descriptor format to use the v1.1 structures.
+	 */
+	if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		struct spmc_shmem_obj *v1_1_obj;
+		uint64_t mem_handle;
+
+		/* Calculate the size that the v1.1 descriptor will required. */
+		size_t v1_1_desc_size =
+		    spmc_shm_get_v1_1_descriptor_size((void *) &obj->desc,
+						      obj->desc_size);
+
+		if (v1_1_desc_size == 0U) {
+			ERROR("%s: cannot determine size of descriptor.\n",
+			      __func__);
+			goto err_arg;
+		}
+
+		/* Get a new obj to store the v1.1 descriptor. */
+		v1_1_obj =
+		    spmc_shmem_obj_alloc(&spmc_shmem_obj_state, v1_1_desc_size);
+
+		if (!v1_1_obj) {
+			ret = FFA_ERROR_NO_MEMORY;
+			goto err_arg;
+		}
+
+		/* Perform the conversion from v1.0 to v1.1. */
+		v1_1_obj->desc_size = v1_1_desc_size;
+		v1_1_obj->desc_filled = v1_1_desc_size;
+		if (!spmc_shm_convert_shmem_obj_from_v1_0(v1_1_obj, obj)) {
+			ERROR("%s: Could not convert mtd!\n", __func__);
+			spmc_shmem_obj_free(&spmc_shmem_obj_state, v1_1_obj);
+			goto err_arg;
+		}
+
+		/*
+		 * We're finished with the v1.0 descriptor so free it
+		 * and continue our checks with the new v1.1 descriptor.
+		 */
+		mem_handle = obj->desc.handle;
+		spmc_shmem_obj_free(&spmc_shmem_obj_state, obj);
+		obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, mem_handle);
+		if (obj == NULL) {
+			ERROR("%s: Failed to find converted descriptor.\n",
+			     __func__);
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			return spmc_ffa_error_return(smc_handle, ret);
+		}
+	}
+
+	/* Allow for platform specific operations to be performed. */
+	ret = plat_spmc_shmem_begin(&obj->desc);
+	if (ret != 0) {
+		goto err_arg;
+	}
+
+	SMC_RET8(smc_handle, FFA_SUCCESS_SMC32, 0, handle_low, handle_high, 0,
+		 0, 0, 0);
+
+err_bad_desc:
+err_arg:
+	spmc_shmem_obj_free(&spmc_shmem_obj_state, obj);
+	return spmc_ffa_error_return(smc_handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_send - FFA_MEM_SHARE/LEND implementation.
+ * @client:             Client state.
+ * @total_length:       Total length of shared memory descriptor.
+ * @fragment_length:    Length of fragment of shared memory descriptor passed in
+ *                      this call.
+ * @address:            Not supported, must be 0.
+ * @page_count:         Not supported, must be 0.
+ * @smc_handle:         Handle passed to smc call. Used to return
+ *                      FFA_MEM_FRAG_RX or SMC_FC_FFA_SUCCESS.
+ *
+ * Implements a subset of the FF-A FFA_MEM_SHARE and FFA_MEM_LEND calls needed
+ * to share or lend memory from non-secure os to secure os (with no stream
+ * endpoints).
+ *
+ * Return: 0 on success, error code on failure.
+ */
+long spmc_ffa_mem_send(uint32_t smc_fid,
+			bool secure_origin,
+			uint64_t total_length,
+			uint32_t fragment_length,
+			uint64_t address,
+			uint32_t page_count,
+			void *cookie,
+			void *handle,
+			uint64_t flags)
+
+{
+	long ret;
+	struct spmc_shmem_obj *obj;
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+	ffa_mtd_flag32_t mtd_flag;
+	uint32_t ffa_version = get_partition_ffa_version(secure_origin);
+
+	if (address != 0U || page_count != 0U) {
+		WARN("%s: custom memory region for message not supported.\n",
+		     __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	if (secure_origin) {
+		WARN("%s: unsupported share direction.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	/*
+	 * Check if the descriptor is smaller than the v1.0 descriptor. The
+	 * descriptor cannot be smaller than this structure.
+	 */
+	if (fragment_length < sizeof(struct ffa_mtd_v1_0)) {
+		WARN("%s: bad first fragment size %u < %zu\n",
+		     __func__, fragment_length, sizeof(struct ffa_mtd_v1_0));
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	if ((smc_fid & FUNCID_NUM_MASK) == FFA_FNUM_MEM_SHARE) {
+		mtd_flag = FFA_MTD_FLAG_TYPE_SHARE_MEMORY;
+	} else if ((smc_fid & FUNCID_NUM_MASK) == FFA_FNUM_MEM_LEND) {
+		mtd_flag = FFA_MTD_FLAG_TYPE_LEND_MEMORY;
+	} else {
+		WARN("%s: invalid memory management operation.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+	obj = spmc_shmem_obj_alloc(&spmc_shmem_obj_state, total_length);
+	if (obj == NULL) {
+		ret = FFA_ERROR_NO_MEMORY;
+		goto err_unlock;
+	}
+
+	spin_lock(&mbox->lock);
+	ret = spmc_ffa_fill_desc(mbox, obj, fragment_length, mtd_flag,
+				 ffa_version, handle);
+	spin_unlock(&mbox->lock);
+
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return ret;
+
+err_unlock:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return spmc_ffa_error_return(handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_frag_tx - FFA_MEM_FRAG_TX implementation.
+ * @client:             Client state.
+ * @handle_low:         Handle_low value returned from FFA_MEM_FRAG_RX.
+ * @handle_high:        Handle_high value returned from FFA_MEM_FRAG_RX.
+ * @fragment_length:    Length of fragments transmitted.
+ * @sender_id:          Vmid of sender in bits [31:16]
+ * @smc_handle:         Handle passed to smc call. Used to return
+ *                      FFA_MEM_FRAG_RX or SMC_FC_FFA_SUCCESS.
+ *
+ * Return: @smc_handle on success, error code on failure.
+ */
+long spmc_ffa_mem_frag_tx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint64_t handle_low,
+			  uint64_t handle_high,
+			  uint32_t fragment_length,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	long ret;
+	uint32_t desc_sender_id;
+	uint32_t ffa_version = get_partition_ffa_version(secure_origin);
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+
+	struct spmc_shmem_obj *obj;
+	uint64_t mem_handle = handle_low | (((uint64_t)handle_high) << 32);
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+
+	obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, mem_handle);
+	if (obj == NULL) {
+		WARN("%s: invalid handle, 0x%lx, not a valid handle.\n",
+		     __func__, mem_handle);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock;
+	}
+
+	desc_sender_id = (uint32_t)obj->desc.sender_id << 16;
+	if (sender_id != desc_sender_id) {
+		WARN("%s: invalid sender_id 0x%x != 0x%x\n", __func__,
+		     sender_id, desc_sender_id);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock;
+	}
+
+	if (obj->desc_filled == obj->desc_size) {
+		WARN("%s: object desc already filled, %zu\n", __func__,
+		     obj->desc_filled);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock;
+	}
+
+	spin_lock(&mbox->lock);
+	ret = spmc_ffa_fill_desc(mbox, obj, fragment_length, 0, ffa_version,
+				 handle);
+	spin_unlock(&mbox->lock);
+
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return ret;
+
+err_unlock:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return spmc_ffa_error_return(handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_retrieve_set_ns_bit - Set the NS bit in the response descriptor
+ *				      if the caller implements a version greater
+ *				      than FF-A 1.0 or if they have requested
+ *				      the functionality.
+ *				      TODO: We are assuming that the caller is
+ *				      an SP. To support retrieval from the
+ *				      normal world this function will need to be
+ *				      expanded accordingly.
+ * @resp:       Descriptor populated in callers RX buffer.
+ * @sp_ctx:     Context of the calling SP.
+ */
+void spmc_ffa_mem_retrieve_set_ns_bit(struct ffa_mtd *resp,
+			 struct secure_partition_desc *sp_ctx)
+{
+	if (sp_ctx->ffa_version > MAKE_FFA_VERSION(1, 0) ||
+	    sp_ctx->ns_bit_requested) {
+		/*
+		 * Currently memory senders must reside in the normal
+		 * world, and we do not have the functionlaity to change
+		 * the state of memory dynamically. Therefore we can always set
+		 * the NS bit to 1.
+		 */
+		resp->memory_region_attributes |= FFA_MEM_ATTR_NS_BIT;
+	}
+}
+
+/**
+ * spmc_ffa_mem_retrieve_req - FFA_MEM_RETRIEVE_REQ implementation.
+ * @smc_fid:            FID of SMC
+ * @total_length:       Total length of retrieve request descriptor if this is
+ *                      the first call. Otherwise (unsupported) must be 0.
+ * @fragment_length:    Length of fragment of retrieve request descriptor passed
+ *                      in this call. Only @fragment_length == @length is
+ *                      supported by this implementation.
+ * @address:            Not supported, must be 0.
+ * @page_count:         Not supported, must be 0.
+ * @smc_handle:         Handle passed to smc call. Used to return
+ *                      FFA_MEM_RETRIEVE_RESP.
+ *
+ * Implements a subset of the FF-A FFA_MEM_RETRIEVE_REQ call.
+ * Used by secure os to retrieve memory already shared by non-secure os.
+ * If the data does not fit in a single FFA_MEM_RETRIEVE_RESP message,
+ * the client must call FFA_MEM_FRAG_RX until the full response has been
+ * received.
+ *
+ * Return: @handle on success, error code on failure.
+ */
+long
+spmc_ffa_mem_retrieve_req(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint32_t total_length,
+			  uint32_t fragment_length,
+			  uint64_t address,
+			  uint32_t page_count,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	int ret;
+	size_t buf_size;
+	size_t copy_size = 0;
+	size_t min_desc_size;
+	size_t out_desc_size = 0;
+
+	/*
+	 * Currently we are only accessing fields that are the same in both the
+	 * v1.0 and v1.1 mtd struct therefore we can use a v1.1 struct directly
+	 * here. We only need validate against the appropriate struct size.
+	 */
+	struct ffa_mtd *resp;
+	const struct ffa_mtd *req;
+	struct spmc_shmem_obj *obj = NULL;
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+	uint32_t ffa_version = get_partition_ffa_version(secure_origin);
+	struct secure_partition_desc *sp_ctx = spmc_get_current_sp_ctx();
+
+	if (!secure_origin) {
+		WARN("%s: unsupported retrieve req direction.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	if (address != 0U || page_count != 0U) {
+		WARN("%s: custom memory region not supported.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&mbox->lock);
+
+	req = mbox->tx_buffer;
+	resp = mbox->rx_buffer;
+	buf_size = mbox->rxtx_page_count * FFA_PAGE_SIZE;
+
+	if (mbox->rxtx_page_count == 0U) {
+		WARN("%s: buffer pair not registered.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	if (mbox->state != MAILBOX_STATE_EMPTY) {
+		WARN("%s: RX Buffer is full! %d\n", __func__, mbox->state);
+		ret = FFA_ERROR_DENIED;
+		goto err_unlock_mailbox;
+	}
+
+	if (fragment_length != total_length) {
+		WARN("%s: fragmented retrieve request not supported.\n",
+		     __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	if (req->emad_count == 0U) {
+		WARN("%s: unsupported attribute desc count %u.\n",
+		     __func__, obj->desc.emad_count);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	/* Determine the appropriate minimum descriptor size. */
+	if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		min_desc_size = sizeof(struct ffa_mtd_v1_0);
+	} else {
+		min_desc_size = sizeof(struct ffa_mtd);
+	}
+	if (total_length < min_desc_size) {
+		WARN("%s: invalid length %u < %zu\n", __func__, total_length,
+		     min_desc_size);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+
+	obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, req->handle);
+	if (obj == NULL) {
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (obj->desc_filled != obj->desc_size) {
+		WARN("%s: incomplete object desc filled %zu < size %zu\n",
+		     __func__, obj->desc_filled, obj->desc_size);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (req->emad_count != 0U && req->sender_id != obj->desc.sender_id) {
+		WARN("%s: wrong sender id 0x%x != 0x%x\n",
+		     __func__, req->sender_id, obj->desc.sender_id);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (req->emad_count != 0U && req->tag != obj->desc.tag) {
+		WARN("%s: wrong tag 0x%lx != 0x%lx\n",
+		     __func__, req->tag, obj->desc.tag);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (req->emad_count != 0U && req->emad_count != obj->desc.emad_count) {
+		WARN("%s: mistmatch of endpoint counts %u != %u\n",
+		     __func__, req->emad_count, obj->desc.emad_count);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	/* Ensure the NS bit is set to 0 in the request. */
+	if ((req->memory_region_attributes & FFA_MEM_ATTR_NS_BIT) != 0U) {
+		WARN("%s: NS mem attributes flags MBZ.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (req->flags != 0U) {
+		if ((req->flags & FFA_MTD_FLAG_TYPE_MASK) !=
+		    (obj->desc.flags & FFA_MTD_FLAG_TYPE_MASK)) {
+			/*
+			 * If the retrieve request specifies the memory
+			 * transaction ensure it matches what we expect.
+			 */
+			WARN("%s: wrong mem transaction flags %x != %x\n",
+			__func__, req->flags, obj->desc.flags);
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+
+		if (req->flags != FFA_MTD_FLAG_TYPE_SHARE_MEMORY &&
+		    req->flags != FFA_MTD_FLAG_TYPE_LEND_MEMORY) {
+			/*
+			 * Current implementation does not support donate and
+			 * it supports no other flags.
+			 */
+			WARN("%s: invalid flags 0x%x\n", __func__, req->flags);
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+	}
+
+	/* Validate the caller is a valid participant. */
+	if (!spmc_shmem_obj_validate_id(&obj->desc, sp_ctx->sp_id)) {
+		WARN("%s: Invalid endpoint ID (0x%x).\n",
+			__func__, sp_ctx->sp_id);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	/* Validate that the provided emad offset and structure is valid.*/
+	for (size_t i = 0; i < req->emad_count; i++) {
+		size_t emad_size;
+		struct ffa_emad_v1_0 *emad;
+
+		emad = spmc_shmem_obj_get_emad(req, i, ffa_version,
+					       &emad_size);
+		if (emad == NULL) {
+			WARN("%s: invalid emad structure.\n", __func__);
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+
+		if ((uintptr_t) emad >= (uintptr_t)
+					((uint8_t *) req + total_length)) {
+			WARN("Invalid emad access.\n");
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+	}
+
+	/*
+	 * Validate all the endpoints match in the case of multiple
+	 * borrowers. We don't mandate that the order of the borrowers
+	 * must match in the descriptors therefore check to see if the
+	 * endpoints match in any order.
+	 */
+	for (size_t i = 0; i < req->emad_count; i++) {
+		bool found = false;
+		size_t emad_size;
+		struct ffa_emad_v1_0 *emad;
+		struct ffa_emad_v1_0 *other_emad;
+
+		emad = spmc_shmem_obj_get_emad(req, i, ffa_version,
+					       &emad_size);
+		if (emad == NULL) {
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+
+		for (size_t j = 0; j < obj->desc.emad_count; j++) {
+			other_emad = spmc_shmem_obj_get_emad(
+					&obj->desc, j, MAKE_FFA_VERSION(1, 1),
+					&emad_size);
+
+			if (other_emad == NULL) {
+				ret = FFA_ERROR_INVALID_PARAMETER;
+				goto err_unlock_all;
+			}
+
+			if (req->emad_count &&
+			    emad->mapd.endpoint_id ==
+			    other_emad->mapd.endpoint_id) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			WARN("%s: invalid receiver id (0x%x).\n",
+			     __func__, emad->mapd.endpoint_id);
+			ret = FFA_ERROR_INVALID_PARAMETER;
+			goto err_unlock_all;
+		}
+	}
+
+	mbox->state = MAILBOX_STATE_FULL;
+
+	if (req->emad_count != 0U) {
+		obj->in_use++;
+	}
+
+	/*
+	 * If the caller is v1.0 convert the descriptor, otherwise copy
+	 * directly.
+	 */
+	if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		ret = spmc_populate_ffa_v1_0_descriptor(resp, obj, buf_size, 0,
+							&copy_size,
+							&out_desc_size);
+		if (ret != 0U) {
+			ERROR("%s: Failed to process descriptor.\n", __func__);
+			goto err_unlock_all;
+		}
+	} else {
+		copy_size = MIN(obj->desc_size, buf_size);
+		out_desc_size = obj->desc_size;
+
+		memcpy(resp, &obj->desc, copy_size);
+	}
+
+	/* Set the NS bit in the response if applicable. */
+	spmc_ffa_mem_retrieve_set_ns_bit(resp, sp_ctx);
+
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	spin_unlock(&mbox->lock);
+
+	SMC_RET8(handle, FFA_MEM_RETRIEVE_RESP, out_desc_size,
+		 copy_size, 0, 0, 0, 0, 0);
+
+err_unlock_all:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+err_unlock_mailbox:
+	spin_unlock(&mbox->lock);
+	return spmc_ffa_error_return(handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_frag_rx - FFA_MEM_FRAG_RX implementation.
+ * @client:             Client state.
+ * @handle_low:         Handle passed to &FFA_MEM_RETRIEVE_REQ. Bit[31:0].
+ * @handle_high:        Handle passed to &FFA_MEM_RETRIEVE_REQ. Bit[63:32].
+ * @fragment_offset:    Byte offset in descriptor to resume at.
+ * @sender_id:          Bit[31:16]: Endpoint id of sender if client is a
+ *                      hypervisor. 0 otherwise.
+ * @smc_handle:         Handle passed to smc call. Used to return
+ *                      FFA_MEM_FRAG_TX.
+ *
+ * Return: @smc_handle on success, error code on failure.
+ */
+long spmc_ffa_mem_frag_rx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint32_t handle_low,
+			  uint32_t handle_high,
+			  uint32_t fragment_offset,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	int ret;
+	void *src;
+	size_t buf_size;
+	size_t copy_size;
+	size_t full_copy_size;
+	uint32_t desc_sender_id;
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+	uint64_t mem_handle = handle_low | (((uint64_t)handle_high) << 32);
+	struct spmc_shmem_obj *obj;
+	uint32_t ffa_version = get_partition_ffa_version(secure_origin);
+
+	if (!secure_origin) {
+		WARN("%s: can only be called from swld.\n",
+		     __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+
+	obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, mem_handle);
+	if (obj == NULL) {
+		WARN("%s: invalid handle, 0x%lx, not a valid handle.\n",
+		     __func__, mem_handle);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_shmem;
+	}
+
+	desc_sender_id = (uint32_t)obj->desc.sender_id << 16;
+	if (sender_id != 0U && sender_id != desc_sender_id) {
+		WARN("%s: invalid sender_id 0x%x != 0x%x\n", __func__,
+		     sender_id, desc_sender_id);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_shmem;
+	}
+
+	if (fragment_offset >= obj->desc_size) {
+		WARN("%s: invalid fragment_offset 0x%x >= 0x%zx\n",
+		     __func__, fragment_offset, obj->desc_size);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_shmem;
+	}
+
+	spin_lock(&mbox->lock);
+
+	if (mbox->rxtx_page_count == 0U) {
+		WARN("%s: buffer pair not registered.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (mbox->state != MAILBOX_STATE_EMPTY) {
+		WARN("%s: RX Buffer is full!\n", __func__);
+		ret = FFA_ERROR_DENIED;
+		goto err_unlock_all;
+	}
+
+	buf_size = mbox->rxtx_page_count * FFA_PAGE_SIZE;
+
+	mbox->state = MAILBOX_STATE_FULL;
+
+	/*
+	 * If the caller is v1.0 convert the descriptor, otherwise copy
+	 * directly.
+	 */
+	if (ffa_version == MAKE_FFA_VERSION(1, 0)) {
+		size_t out_desc_size;
+
+		ret = spmc_populate_ffa_v1_0_descriptor(mbox->rx_buffer, obj,
+							buf_size,
+							fragment_offset,
+							&copy_size,
+							&out_desc_size);
+		if (ret != 0U) {
+			ERROR("%s: Failed to process descriptor.\n", __func__);
+			goto err_unlock_all;
+		}
+	} else {
+		full_copy_size = obj->desc_size - fragment_offset;
+		copy_size = MIN(full_copy_size, buf_size);
+
+		src = &obj->desc;
+
+		memcpy(mbox->rx_buffer, src + fragment_offset, copy_size);
+	}
+
+	spin_unlock(&mbox->lock);
+	spin_unlock(&spmc_shmem_obj_state.lock);
+
+	SMC_RET8(handle, FFA_MEM_FRAG_TX, handle_low, handle_high,
+		 copy_size, sender_id, 0, 0, 0);
+
+err_unlock_all:
+	spin_unlock(&mbox->lock);
+err_unlock_shmem:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return spmc_ffa_error_return(handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_relinquish - FFA_MEM_RELINQUISH implementation.
+ * @client:             Client state.
+ *
+ * Implements a subset of the FF-A FFA_MEM_RELINQUISH call.
+ * Used by secure os release previously shared memory to non-secure os.
+ *
+ * The handle to release must be in the client's (secure os's) transmit buffer.
+ *
+ * Return: 0 on success, error code on failure.
+ */
+int spmc_ffa_mem_relinquish(uint32_t smc_fid,
+			    bool secure_origin,
+			    uint32_t handle_low,
+			    uint32_t handle_high,
+			    uint32_t fragment_offset,
+			    uint32_t sender_id,
+			    void *cookie,
+			    void *handle,
+			    uint64_t flags)
+{
+	int ret;
+	struct mailbox *mbox = spmc_get_mbox_desc(secure_origin);
+	struct spmc_shmem_obj *obj;
+	const struct ffa_mem_relinquish_descriptor *req;
+	struct secure_partition_desc *sp_ctx = spmc_get_current_sp_ctx();
+
+	if (!secure_origin) {
+		WARN("%s: unsupported relinquish direction.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&mbox->lock);
+
+	if (mbox->rxtx_page_count == 0U) {
+		WARN("%s: buffer pair not registered.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	req = mbox->tx_buffer;
+
+	if (req->flags != 0U) {
+		WARN("%s: unsupported flags 0x%x\n", __func__, req->flags);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	if (req->endpoint_count == 0) {
+		WARN("%s: endpoint count cannot be 0.\n", __func__);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_mailbox;
+	}
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+
+	obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, req->handle);
+	if (obj == NULL) {
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	/*
+	 * Validate the endpoint ID was populated correctly. We don't currently
+	 * support proxy endpoints so the endpoint count should always be 1.
+	 */
+	if (req->endpoint_count != 1U) {
+		WARN("%s: unsupported endpoint count %u != 1\n", __func__,
+		     req->endpoint_count);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	/* Validate provided endpoint ID matches the partition ID. */
+	if (req->endpoint_array[0] != sp_ctx->sp_id) {
+		WARN("%s: invalid endpoint ID %u != %u\n", __func__,
+		     req->endpoint_array[0], sp_ctx->sp_id);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	/* Validate the caller is a valid participant. */
+	if (!spmc_shmem_obj_validate_id(&obj->desc, sp_ctx->sp_id)) {
+		WARN("%s: Invalid endpoint ID (0x%x).\n",
+			__func__, req->endpoint_array[0]);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+
+	if (obj->in_use == 0U) {
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock_all;
+	}
+	obj->in_use--;
+
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	spin_unlock(&mbox->lock);
+
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+
+err_unlock_all:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+err_unlock_mailbox:
+	spin_unlock(&mbox->lock);
+	return spmc_ffa_error_return(handle, ret);
+}
+
+/**
+ * spmc_ffa_mem_reclaim - FFA_MEM_RECLAIM implementation.
+ * @client:         Client state.
+ * @handle_low:     Unique handle of shared memory object to reclaim. Bit[31:0].
+ * @handle_high:    Unique handle of shared memory object to reclaim.
+ *                  Bit[63:32].
+ * @flags:          Unsupported, ignored.
+ *
+ * Implements a subset of the FF-A FFA_MEM_RECLAIM call.
+ * Used by non-secure os reclaim memory previously shared with secure os.
+ *
+ * Return: 0 on success, error code on failure.
+ */
+int spmc_ffa_mem_reclaim(uint32_t smc_fid,
+			 bool secure_origin,
+			 uint32_t handle_low,
+			 uint32_t handle_high,
+			 uint32_t mem_flags,
+			 uint64_t x4,
+			 void *cookie,
+			 void *handle,
+			 uint64_t flags)
+{
+	int ret;
+	struct spmc_shmem_obj *obj;
+	uint64_t mem_handle = handle_low | (((uint64_t)handle_high) << 32);
+
+	if (secure_origin) {
+		WARN("%s: unsupported reclaim direction.\n", __func__);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	if (mem_flags != 0U) {
+		WARN("%s: unsupported flags 0x%x\n", __func__, mem_flags);
+		return spmc_ffa_error_return(handle,
+					     FFA_ERROR_INVALID_PARAMETER);
+	}
+
+	spin_lock(&spmc_shmem_obj_state.lock);
+
+	obj = spmc_shmem_obj_lookup(&spmc_shmem_obj_state, mem_handle);
+	if (obj == NULL) {
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock;
+	}
+	if (obj->in_use != 0U) {
+		ret = FFA_ERROR_DENIED;
+		goto err_unlock;
+	}
+
+	if (obj->desc_filled != obj->desc_size) {
+		WARN("%s: incomplete object desc filled %zu < size %zu\n",
+		     __func__, obj->desc_filled, obj->desc_size);
+		ret = FFA_ERROR_INVALID_PARAMETER;
+		goto err_unlock;
+	}
+
+	/* Allow for platform specific operations to be performed. */
+	ret = plat_spmc_shmem_reclaim(&obj->desc);
+	if (ret != 0) {
+		goto err_unlock;
+	}
+
+	spmc_shmem_obj_free(&spmc_shmem_obj_state, obj);
+	spin_unlock(&spmc_shmem_obj_state.lock);
+
+	SMC_RET1(handle, FFA_SUCCESS_SMC32);
+
+err_unlock:
+	spin_unlock(&spmc_shmem_obj_state.lock);
+	return spmc_ffa_error_return(handle, ret);
+}
diff --git a/services/std_svc/spm/el3_spmc/spmc_shared_mem.h b/services/std_svc/spm/el3_spmc/spmc_shared_mem.h
new file mode 100644
index 0000000..839f7a1
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_shared_mem.h
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPMC_SHARED_MEM_H
+#define SPMC_SHARED_MEM_H
+
+#include <services/el3_spmc_ffa_memory.h>
+
+/**
+ * struct ffa_mem_relinquish_descriptor - Relinquish request descriptor.
+ * @handle:
+ *         Id of shared memory object to relinquish.
+ * @flags:
+ *         If bit 0 is set clear memory after unmapping from borrower. Must be 0
+ *         for share. Bit[1]: Time slicing. Not supported, must be 0. All other
+ *         bits are reserved 0.
+ * @endpoint_count:
+ *         Number of entries in @endpoint_array.
+ * @endpoint_array:
+ *         Array of endpoint ids.
+ */
+struct ffa_mem_relinquish_descriptor {
+	uint64_t handle;
+	uint32_t flags;
+	uint32_t endpoint_count;
+	ffa_endpoint_id16_t endpoint_array[];
+};
+CASSERT(sizeof(struct ffa_mem_relinquish_descriptor) == 16,
+	assert_ffa_mem_relinquish_descriptor_size_mismatch);
+
+/**
+ * struct spmc_shmem_obj_state - Global state.
+ * @data:           Backing store for spmc_shmem_obj objects.
+ * @data_size:      The size allocated for the backing store.
+ * @allocated:      Number of bytes allocated in @data.
+ * @next_handle:    Handle used for next allocated object.
+ * @lock:           Lock protecting all state in this file.
+ */
+struct spmc_shmem_obj_state {
+	uint8_t *data;
+	size_t data_size;
+	size_t allocated;
+	uint64_t next_handle;
+	spinlock_t lock;
+};
+
+extern struct spmc_shmem_obj_state spmc_shmem_obj_state;
+extern int plat_spmc_shmem_begin(struct ffa_mtd *desc);
+extern int plat_spmc_shmem_reclaim(struct ffa_mtd *desc);
+
+long spmc_ffa_mem_send(uint32_t smc_fid,
+		       bool secure_origin,
+		       uint64_t total_length,
+		       uint32_t fragment_length,
+		       uint64_t address,
+		       uint32_t page_count,
+		       void *cookie,
+		       void *handle,
+		       uint64_t flags);
+
+long spmc_ffa_mem_frag_tx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint64_t handle_low,
+			  uint64_t handle_high,
+			  uint32_t fragment_length,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags);
+
+long spmc_ffa_mem_retrieve_req(uint32_t smc_fid,
+			       bool secure_origin,
+			       uint32_t total_length,
+			       uint32_t fragment_length,
+			       uint64_t address,
+			       uint32_t page_count,
+			       void *cookie,
+			       void *handle,
+			       uint64_t flags);
+
+long spmc_ffa_mem_frag_rx(uint32_t smc_fid,
+			  bool secure_origin,
+			  uint32_t handle_low,
+			  uint32_t handle_high,
+			  uint32_t fragment_offset,
+			  uint32_t sender_id,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags);
+
+
+int spmc_ffa_mem_relinquish(uint32_t smc_fid,
+			    bool secure_origin,
+			    uint32_t handle_low,
+			    uint32_t handle_high,
+			    uint32_t fragment_offset,
+			    uint32_t sender_id,
+			    void *cookie,
+			    void *handle,
+			    uint64_t flags);
+
+int spmc_ffa_mem_reclaim(uint32_t smc_fid,
+			 bool secure_origin,
+			 uint32_t handle_low,
+			 uint32_t handle_high,
+			 uint32_t mem_flags,
+			 uint64_t x4,
+			 void *cookie,
+			 void *handle,
+			 uint64_t flags);
+
+#endif /* SPMC_SHARED_MEM_H */
diff --git a/services/std_svc/spm/spm_mm/aarch64/spm_mm_shim_exceptions.S b/services/std_svc/spm/spm_mm/aarch64/spm_mm_shim_exceptions.S
new file mode 100644
index 0000000..836f75c
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/aarch64/spm_mm_shim_exceptions.S
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <common/bl_common.h>
+#include <context.h>
+
+/* -----------------------------------------------------------------------------
+ * Very simple stackless exception handlers used by the spm shim layer.
+ * -----------------------------------------------------------------------------
+ */
+	.globl	spm_shim_exceptions_ptr
+
+vector_base spm_shim_exceptions_ptr, .spm_shim_exceptions
+
+	/* -----------------------------------------------------
+	 * Current EL with SP0 : 0x0 - 0x200
+	 * -----------------------------------------------------
+	 */
+vector_entry SynchronousExceptionSP0, .spm_shim_exceptions
+	b	.
+end_vector_entry SynchronousExceptionSP0
+
+vector_entry IrqSP0, .spm_shim_exceptions
+	b	.
+end_vector_entry IrqSP0
+
+vector_entry FiqSP0, .spm_shim_exceptions
+	b	.
+end_vector_entry FiqSP0
+
+vector_entry SErrorSP0, .spm_shim_exceptions
+	b	.
+end_vector_entry SErrorSP0
+
+	/* -----------------------------------------------------
+	 * Current EL with SPx: 0x200 - 0x400
+	 * -----------------------------------------------------
+	 */
+vector_entry SynchronousExceptionSPx, .spm_shim_exceptions
+	b	.
+end_vector_entry SynchronousExceptionSPx
+
+vector_entry IrqSPx, .spm_shim_exceptions
+	b	.
+end_vector_entry IrqSPx
+
+vector_entry FiqSPx, .spm_shim_exceptions
+	b	.
+end_vector_entry FiqSPx
+
+vector_entry SErrorSPx, .spm_shim_exceptions
+	b	.
+end_vector_entry SErrorSPx
+
+	/* -----------------------------------------------------
+	 * Lower EL using AArch64 : 0x400 - 0x600. No exceptions
+	 * are handled since secure_partition does not implement
+	 * a lower EL
+	 * -----------------------------------------------------
+	 */
+vector_entry SynchronousExceptionA64, .spm_shim_exceptions
+	msr	tpidr_el1, x30
+	mrs	x30, esr_el1
+	ubfx	x30, x30, #ESR_EC_SHIFT, #ESR_EC_LENGTH
+
+	cmp	x30, #EC_AARCH64_SVC
+	b.eq 	do_smc
+
+	cmp	x30, #EC_AARCH32_SVC
+	b.eq	do_smc
+
+	cmp	x30, #EC_AARCH64_SYS
+	b.eq	handle_sys_trap
+
+	/* Fail in all the other cases */
+	b	panic
+
+	/* ---------------------------------------------
+	 * Tell SPM that we are done initialising
+	 * ---------------------------------------------
+	 */
+do_smc:
+	mrs	x30, tpidr_el1
+	smc	#0
+	exception_return
+
+	/* AArch64 system instructions trap are handled as a panic for now */
+handle_sys_trap:
+panic:
+	b	panic
+end_vector_entry SynchronousExceptionA64
+
+vector_entry IrqA64, .spm_shim_exceptions
+	b	.
+end_vector_entry IrqA64
+
+vector_entry FiqA64, .spm_shim_exceptions
+	b	.
+end_vector_entry FiqA64
+
+vector_entry SErrorA64, .spm_shim_exceptions
+	b	.
+end_vector_entry SErrorA64
+
+	/* -----------------------------------------------------
+	 * Lower EL using AArch32 : 0x600 - 0x800
+	 * -----------------------------------------------------
+	 */
+vector_entry SynchronousExceptionA32, .spm_shim_exceptions
+	b	.
+end_vector_entry SynchronousExceptionA32
+
+vector_entry IrqA32, .spm_shim_exceptions
+	b	.
+end_vector_entry IrqA32
+
+vector_entry FiqA32, .spm_shim_exceptions
+	b	.
+end_vector_entry FiqA32
+
+vector_entry SErrorA32, .spm_shim_exceptions
+	b	.
+end_vector_entry SErrorA32
diff --git a/services/std_svc/spm/spm_mm/spm_mm.mk b/services/std_svc/spm/spm_mm/spm_mm.mk
new file mode 100644
index 0000000..f6691c3
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm.mk
@@ -0,0 +1,34 @@
+#
+# Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${SPD},none)
+        $(error "Error: SPD and SPM_MM are incompatible build options.")
+endif
+ifneq (${ARCH},aarch64)
+        $(error "Error: SPM_MM is only supported on aarch64.")
+endif
+ifeq (${ENABLE_SVE_FOR_NS},1)
+        $(error "Error: SPM_MM is not compatible with ENABLE_SVE_FOR_NS")
+endif
+ifeq (${ENABLE_SME_FOR_NS},1)
+        $(error "Error: SPM_MM is not compatible with ENABLE_SME_FOR_NS")
+endif
+ifeq (${CTX_INCLUDE_FPREGS},0)
+        $(warning "Warning: SPM_MM: CTX_INCLUDE_FPREGS is set to 0")
+endif
+
+SPM_MM_SOURCES	:=	$(addprefix services/std_svc/spm/spm_mm/,	\
+			${ARCH}/spm_mm_shim_exceptions.S		\
+			spm_mm_main.c					\
+			spm_mm_setup.c					\
+			spm_mm_xlat.c)
+
+
+# Let the top-level Makefile know that we intend to include a BL32 image
+NEED_BL32		:=	yes
+
+# required so that SPM code executing at S-EL0 can access the timer registers
+NS_TIMER_SWITCH		:=	1
diff --git a/services/std_svc/spm/spm_mm/spm_mm_main.c b/services/std_svc/spm/spm_mm/spm_mm_main.c
new file mode 100644
index 0000000..8525cd2
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm_main.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <bl31/bl31.h>
+#include <bl31/ehf.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/smccc.h>
+#include <lib/spinlock.h>
+#include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat/common/platform.h>
+#include <services/spm_mm_partition.h>
+#include <services/spm_mm_svc.h>
+#include <smccc_helpers.h>
+
+#include "spm_common.h"
+#include "spm_mm_private.h"
+
+/*******************************************************************************
+ * Secure Partition context information.
+ ******************************************************************************/
+static sp_context_t sp_ctx;
+
+/*******************************************************************************
+ * Set state of a Secure Partition context.
+ ******************************************************************************/
+void sp_state_set(sp_context_t *sp_ptr, sp_state_t state)
+{
+	spin_lock(&(sp_ptr->state_lock));
+	sp_ptr->state = state;
+	spin_unlock(&(sp_ptr->state_lock));
+}
+
+/*******************************************************************************
+ * Wait until the state of a Secure Partition is the specified one and change it
+ * to the desired state.
+ ******************************************************************************/
+void sp_state_wait_switch(sp_context_t *sp_ptr, sp_state_t from, sp_state_t to)
+{
+	int success = 0;
+
+	while (success == 0) {
+		spin_lock(&(sp_ptr->state_lock));
+
+		if (sp_ptr->state == from) {
+			sp_ptr->state = to;
+
+			success = 1;
+		}
+
+		spin_unlock(&(sp_ptr->state_lock));
+	}
+}
+
+/*******************************************************************************
+ * Check if the state of a Secure Partition is the specified one and, if so,
+ * change it to the desired state. Returns 0 on success, -1 on error.
+ ******************************************************************************/
+int sp_state_try_switch(sp_context_t *sp_ptr, sp_state_t from, sp_state_t to)
+{
+	int ret = -1;
+
+	spin_lock(&(sp_ptr->state_lock));
+
+	if (sp_ptr->state == from) {
+		sp_ptr->state = to;
+
+		ret = 0;
+	}
+
+	spin_unlock(&(sp_ptr->state_lock));
+
+	return ret;
+}
+
+/*******************************************************************************
+ * This function takes an SP context pointer and performs a synchronous entry
+ * into it.
+ ******************************************************************************/
+static uint64_t spm_sp_synchronous_entry(sp_context_t *ctx)
+{
+	uint64_t rc;
+
+	assert(ctx != NULL);
+
+	/* Assign the context of the SP to this CPU */
+	cm_set_context(&(ctx->cpu_ctx), SECURE);
+
+	/* Restore the context assigned above */
+	cm_el1_sysregs_context_restore(SECURE);
+	cm_set_next_eret_context(SECURE);
+
+	/* Invalidate TLBs at EL1. */
+	tlbivmalle1();
+	dsbish();
+
+	/* Enter Secure Partition */
+	rc = spm_secure_partition_enter(&ctx->c_rt_ctx);
+
+	/* Save secure state */
+	cm_el1_sysregs_context_save(SECURE);
+
+	return rc;
+}
+
+/*******************************************************************************
+ * This function returns to the place where spm_sp_synchronous_entry() was
+ * called originally.
+ ******************************************************************************/
+__dead2 static void spm_sp_synchronous_exit(uint64_t rc)
+{
+	sp_context_t *ctx = &sp_ctx;
+
+	/*
+	 * The SPM must have initiated the original request through a
+	 * synchronous entry into the secure partition. Jump back to the
+	 * original C runtime context with the value of rc in x0;
+	 */
+	spm_secure_partition_exit(ctx->c_rt_ctx, rc);
+
+	panic();
+}
+
+/*******************************************************************************
+ * Jump to each Secure Partition for the first time.
+ ******************************************************************************/
+static int32_t spm_init(void)
+{
+	uint64_t rc;
+	sp_context_t *ctx;
+
+	INFO("Secure Partition init...\n");
+
+	ctx = &sp_ctx;
+
+	ctx->state = SP_STATE_RESET;
+
+	rc = spm_sp_synchronous_entry(ctx);
+	assert(rc == 0);
+
+	ctx->state = SP_STATE_IDLE;
+
+	INFO("Secure Partition initialized.\n");
+
+	return !rc;
+}
+
+/*******************************************************************************
+ * Initialize contexts of all Secure Partitions.
+ ******************************************************************************/
+int32_t spm_mm_setup(void)
+{
+	sp_context_t *ctx;
+
+	/* Disable MMU at EL1 (initialized by BL2) */
+	disable_mmu_icache_el1();
+
+	/* Initialize context of the SP */
+	INFO("Secure Partition context setup start...\n");
+
+	ctx = &sp_ctx;
+
+	/* Assign translation tables context. */
+	ctx->xlat_ctx_handle = spm_get_sp_xlat_context();
+
+	spm_sp_setup(ctx);
+
+	/* Register init function for deferred init.  */
+	bl31_register_bl32_init(&spm_init);
+
+	INFO("Secure Partition setup done.\n");
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Function to perform a call to a Secure Partition.
+ ******************************************************************************/
+uint64_t spm_mm_sp_call(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3)
+{
+	uint64_t rc;
+	sp_context_t *sp_ptr = &sp_ctx;
+
+#if CTX_INCLUDE_FPREGS
+	/*
+	 * SP runs to completion, no need to restore FP registers of secure context.
+	 * Save FP registers only for non secure context.
+	 */
+	fpregs_context_save(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+#endif
+
+	/* Wait until the Secure Partition is idle and set it to busy. */
+	sp_state_wait_switch(sp_ptr, SP_STATE_IDLE, SP_STATE_BUSY);
+
+	/* Set values for registers on SP entry */
+	cpu_context_t *cpu_ctx = &(sp_ptr->cpu_ctx);
+
+	write_ctx_reg(get_gpregs_ctx(cpu_ctx), CTX_GPREG_X0, smc_fid);
+	write_ctx_reg(get_gpregs_ctx(cpu_ctx), CTX_GPREG_X1, x1);
+	write_ctx_reg(get_gpregs_ctx(cpu_ctx), CTX_GPREG_X2, x2);
+	write_ctx_reg(get_gpregs_ctx(cpu_ctx), CTX_GPREG_X3, x3);
+
+	/* Jump to the Secure Partition. */
+	rc = spm_sp_synchronous_entry(sp_ptr);
+
+	/* Flag Secure Partition as idle. */
+	assert(sp_ptr->state == SP_STATE_BUSY);
+	sp_state_set(sp_ptr, SP_STATE_IDLE);
+
+#if CTX_INCLUDE_FPREGS
+	/*
+	 * SP runs to completion, no need to save FP registers of secure context.
+	 * Restore only non secure world FP registers.
+	 */
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+#endif
+
+	return rc;
+}
+
+/*******************************************************************************
+ * MM_COMMUNICATE handler
+ ******************************************************************************/
+static uint64_t mm_communicate(uint32_t smc_fid, uint64_t mm_cookie,
+			       uint64_t comm_buffer_address,
+			       uint64_t comm_size_address, void *handle)
+{
+	uint64_t rc;
+
+	/* Cookie. Reserved for future use. It must be zero. */
+	if (mm_cookie != 0U) {
+		ERROR("MM_COMMUNICATE: cookie is not zero\n");
+		SMC_RET1(handle, SPM_MM_INVALID_PARAMETER);
+	}
+
+	if (comm_buffer_address == 0U) {
+		ERROR("MM_COMMUNICATE: comm_buffer_address is zero\n");
+		SMC_RET1(handle, SPM_MM_INVALID_PARAMETER);
+	}
+
+	if (comm_size_address != 0U) {
+		VERBOSE("MM_COMMUNICATE: comm_size_address is not 0 as recommended.\n");
+	}
+
+	/*
+	 * The current secure partition design mandates
+	 * - at any point, only a single core can be
+	 *   executing in the secure partiton.
+	 * - a core cannot be preempted by an interrupt
+	 *   while executing in secure partition.
+	 * Raise the running priority of the core to the
+	 * interrupt level configured for secure partition
+	 * so as to block any interrupt from preempting this
+	 * core.
+	 */
+	ehf_activate_priority(PLAT_SP_PRI);
+
+	/* Save the Normal world context */
+	cm_el1_sysregs_context_save(NON_SECURE);
+
+	rc = spm_mm_sp_call(smc_fid, comm_buffer_address, comm_size_address,
+			    plat_my_core_pos());
+
+	/* Restore non-secure state */
+	cm_el1_sysregs_context_restore(NON_SECURE);
+	cm_set_next_eret_context(NON_SECURE);
+
+	/*
+	 * Exited from secure partition. This core can take
+	 * interrupts now.
+	 */
+	ehf_deactivate_priority(PLAT_SP_PRI);
+
+	SMC_RET1(handle, rc);
+}
+
+/*******************************************************************************
+ * Secure Partition Manager SMC handler.
+ ******************************************************************************/
+uint64_t spm_mm_smc_handler(uint32_t smc_fid,
+			 uint64_t x1,
+			 uint64_t x2,
+			 uint64_t x3,
+			 uint64_t x4,
+			 void *cookie,
+			 void *handle,
+			 uint64_t flags)
+{
+	unsigned int ns;
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+
+	if (ns == SMC_FROM_SECURE) {
+
+		/* Handle SMCs from Secure world. */
+
+		assert(handle == cm_get_context(SECURE));
+
+		/* Make next ERET jump to S-EL0 instead of S-EL1. */
+		cm_set_elr_spsr_el3(SECURE, read_elr_el1(), read_spsr_el1());
+
+		switch (smc_fid) {
+
+		case SPM_MM_VERSION_AARCH32:
+			SMC_RET1(handle, SPM_MM_VERSION_COMPILED);
+
+		case MM_SP_EVENT_COMPLETE_AARCH64:
+			spm_sp_synchronous_exit(x1);
+
+		case MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64:
+			INFO("Received MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64 SMC\n");
+
+			if (sp_ctx.state != SP_STATE_RESET) {
+				WARN("MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64 is available at boot time only\n");
+				SMC_RET1(handle, SPM_MM_NOT_SUPPORTED);
+			}
+			SMC_RET1(handle,
+				 spm_memory_attributes_get_smc_handler(
+					 &sp_ctx, x1));
+
+		case MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64:
+			INFO("Received MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64 SMC\n");
+
+			if (sp_ctx.state != SP_STATE_RESET) {
+				WARN("MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64 is available at boot time only\n");
+				SMC_RET1(handle, SPM_MM_NOT_SUPPORTED);
+			}
+			SMC_RET1(handle,
+				 spm_memory_attributes_set_smc_handler(
+					&sp_ctx, x1, x2, x3));
+		default:
+			break;
+		}
+	} else {
+
+		/* Handle SMCs from Non-secure world. */
+
+		assert(handle == cm_get_context(NON_SECURE));
+
+		switch (smc_fid) {
+
+		case MM_VERSION_AARCH32:
+			SMC_RET1(handle, MM_VERSION_COMPILED);
+
+		case MM_COMMUNICATE_AARCH32:
+		case MM_COMMUNICATE_AARCH64:
+			return mm_communicate(smc_fid, x1, x2, x3, handle);
+
+		case MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64:
+		case MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64:
+			/* SMC interfaces reserved for secure callers. */
+			SMC_RET1(handle, SPM_MM_NOT_SUPPORTED);
+
+		default:
+			break;
+		}
+	}
+
+	SMC_RET1(handle, SMC_UNK);
+}
diff --git a/services/std_svc/spm/spm_mm/spm_mm_private.h b/services/std_svc/spm/spm_mm/spm_mm_private.h
new file mode 100644
index 0000000..0eff1c0
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm_private.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPM_MM_PRIVATE_H
+#define SPM_MM_PRIVATE_H
+
+#include <context.h>
+#include "spm_common.h"
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define SP_C_RT_CTX_X19		0x0
+#define SP_C_RT_CTX_X20		0x8
+#define SP_C_RT_CTX_X21		0x10
+#define SP_C_RT_CTX_X22		0x18
+#define SP_C_RT_CTX_X23		0x20
+#define SP_C_RT_CTX_X24		0x28
+#define SP_C_RT_CTX_X25		0x30
+#define SP_C_RT_CTX_X26		0x38
+#define SP_C_RT_CTX_X27		0x40
+#define SP_C_RT_CTX_X28		0x48
+#define SP_C_RT_CTX_X29		0x50
+#define SP_C_RT_CTX_X30		0x58
+
+#define SP_C_RT_CTX_SIZE	0x60
+#define SP_C_RT_CTX_ENTRIES	(SP_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#include <lib/spinlock.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+
+typedef enum sp_state {
+	SP_STATE_RESET = 0,
+	SP_STATE_IDLE,
+	SP_STATE_BUSY
+} sp_state_t;
+
+typedef struct sp_context {
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+	xlat_ctx_t *xlat_ctx_handle;
+
+	sp_state_t state;
+	spinlock_t state_lock;
+} sp_context_t;
+
+
+void spm_sp_setup(sp_context_t *sp_ctx);
+
+xlat_ctx_t *spm_get_sp_xlat_context(void);
+
+int32_t spm_memory_attributes_get_smc_handler(sp_context_t *sp_ctx,
+					      uintptr_t base_va);
+int spm_memory_attributes_set_smc_handler(sp_context_t *sp_ctx,
+					  u_register_t page_address,
+					  u_register_t pages_count,
+					  u_register_t smc_attributes);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* SPM_MM_PRIVATE_H */
diff --git a/services/std_svc/spm/spm_mm/spm_mm_setup.c b/services/std_svc/spm/spm_mm/spm_mm_setup.c
new file mode 100644
index 0000000..04dc212
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm_setup.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2021, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <context.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <platform_def.h>
+#include <plat/common/common_def.h>
+#include <plat/common/platform.h>
+#include <services/spm_mm_partition.h>
+
+#include "spm_common.h"
+#include "spm_mm_private.h"
+#include "spm_mm_shim_private.h"
+
+/* Setup context of the Secure Partition */
+void spm_sp_setup(sp_context_t *sp_ctx)
+{
+	cpu_context_t *ctx = &(sp_ctx->cpu_ctx);
+
+	/* Pointer to the MP information from the platform port. */
+	const spm_mm_boot_info_t *sp_boot_info =
+			plat_get_secure_partition_boot_info(NULL);
+
+	/*
+	 * Initialize CPU context
+	 * ----------------------
+	 */
+
+	entry_point_info_t ep_info = {0};
+
+	SET_PARAM_HEAD(&ep_info, PARAM_EP, VERSION_1, SECURE | EP_ST_ENABLE);
+
+	/* Setup entrypoint and SPSR */
+	ep_info.pc = sp_boot_info->sp_image_base;
+	ep_info.spsr = SPSR_64(MODE_EL0, MODE_SP_EL0, DISABLE_ALL_EXCEPTIONS);
+
+	/*
+	 * X0: Virtual address of a buffer shared between EL3 and Secure EL0.
+	 *     The buffer will be mapped in the Secure EL1 translation regime
+	 *     with Normal IS WBWA attributes and RO data and Execute Never
+	 *     instruction access permissions.
+	 *
+	 * X1: Size of the buffer in bytes
+	 *
+	 * X2: cookie value (Implementation Defined)
+	 *
+	 * X3: cookie value (Implementation Defined)
+	 *
+	 * X4 to X7 = 0
+	 */
+	ep_info.args.arg0 = sp_boot_info->sp_shared_buf_base;
+	ep_info.args.arg1 = sp_boot_info->sp_shared_buf_size;
+	ep_info.args.arg2 = PLAT_SPM_COOKIE_0;
+	ep_info.args.arg3 = PLAT_SPM_COOKIE_1;
+
+	cm_setup_context(ctx, &ep_info);
+
+	/*
+	 * SP_EL0: A non-zero value will indicate to the SP that the SPM has
+	 * initialized the stack pointer for the current CPU through
+	 * implementation defined means. The value will be 0 otherwise.
+	 */
+	write_ctx_reg(get_gpregs_ctx(ctx), CTX_GPREG_SP_EL0,
+			sp_boot_info->sp_stack_base + sp_boot_info->sp_pcpu_stack_size);
+
+	/*
+	 * Setup translation tables
+	 * ------------------------
+	 */
+
+#if ENABLE_ASSERTIONS
+
+	/* Get max granularity supported by the platform. */
+	unsigned int max_granule = xlat_arch_get_max_supported_granule_size();
+
+	VERBOSE("Max translation granule size supported: %u KiB\n",
+		max_granule / 1024U);
+
+	unsigned int max_granule_mask = max_granule - 1U;
+
+	/* Base must be aligned to the max granularity */
+	assert((sp_boot_info->sp_ns_comm_buf_base & max_granule_mask) == 0);
+
+	/* Size must be a multiple of the max granularity */
+	assert((sp_boot_info->sp_ns_comm_buf_size & max_granule_mask) == 0);
+
+#endif /* ENABLE_ASSERTIONS */
+
+	/* This region contains the exception vectors used at S-EL1. */
+	const mmap_region_t sel1_exception_vectors =
+		MAP_REGION_FLAT(SPM_SHIM_EXCEPTIONS_START,
+				SPM_SHIM_EXCEPTIONS_SIZE,
+				MT_CODE | MT_SECURE | MT_PRIVILEGED);
+	mmap_add_region_ctx(sp_ctx->xlat_ctx_handle,
+			    &sel1_exception_vectors);
+
+	mmap_add_ctx(sp_ctx->xlat_ctx_handle,
+		     plat_get_secure_partition_mmap(NULL));
+
+	init_xlat_tables_ctx(sp_ctx->xlat_ctx_handle);
+
+	/*
+	 * MMU-related registers
+	 * ---------------------
+	 */
+	xlat_ctx_t *xlat_ctx = sp_ctx->xlat_ctx_handle;
+
+	uint64_t mmu_cfg_params[MMU_CFG_PARAM_MAX];
+
+	setup_mmu_cfg((uint64_t *)&mmu_cfg_params, 0, xlat_ctx->base_table,
+		      xlat_ctx->pa_max_address, xlat_ctx->va_max_address,
+		      EL1_EL0_REGIME);
+
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_MAIR_EL1,
+		      mmu_cfg_params[MMU_CFG_MAIR]);
+
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_TCR_EL1,
+		      mmu_cfg_params[MMU_CFG_TCR]);
+
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_TTBR0_EL1,
+		      mmu_cfg_params[MMU_CFG_TTBR0]);
+
+	/* Setup SCTLR_EL1 */
+	u_register_t sctlr_el1 = read_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_SCTLR_EL1);
+
+	sctlr_el1 |=
+		/*SCTLR_EL1_RES1 |*/
+		/* Don't trap DC CVAU, DC CIVAC, DC CVAC, DC CVAP, or IC IVAU */
+		SCTLR_UCI_BIT							|
+		/* RW regions at xlat regime EL1&0 are forced to be XN. */
+		SCTLR_WXN_BIT							|
+		/* Don't trap to EL1 execution of WFI or WFE at EL0. */
+		SCTLR_NTWI_BIT | SCTLR_NTWE_BIT					|
+		/* Don't trap to EL1 accesses to CTR_EL0 from EL0. */
+		SCTLR_UCT_BIT							|
+		/* Don't trap to EL1 execution of DZ ZVA at EL0. */
+		SCTLR_DZE_BIT							|
+		/* Enable SP Alignment check for EL0 */
+		SCTLR_SA0_BIT							|
+		/* Don't change PSTATE.PAN on taking an exception to EL1 */
+		SCTLR_SPAN_BIT							|
+		/* Allow cacheable data and instr. accesses to normal memory. */
+		SCTLR_C_BIT | SCTLR_I_BIT					|
+		/* Enable MMU. */
+		SCTLR_M_BIT
+	;
+
+	sctlr_el1 &= ~(
+		/* Explicit data accesses at EL0 are little-endian. */
+		SCTLR_E0E_BIT							|
+		/*
+		 * Alignment fault checking disabled when at EL1 and EL0 as
+		 * the UEFI spec permits unaligned accesses.
+		 */
+		SCTLR_A_BIT							|
+		/* Accesses to DAIF from EL0 are trapped to EL1. */
+		SCTLR_UMA_BIT
+	);
+
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_SCTLR_EL1, sctlr_el1);
+
+	/*
+	 * Setup other system registers
+	 * ----------------------------
+	 */
+
+	/* Shim Exception Vector Base Address */
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_VBAR_EL1,
+			SPM_SHIM_EXCEPTIONS_PTR);
+
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_CNTKCTL_EL1,
+		      EL0PTEN_BIT | EL0VTEN_BIT | EL0PCTEN_BIT | EL0VCTEN_BIT);
+
+	/*
+	 * FPEN: Allow the Secure Partition to access FP/SIMD registers.
+	 * Note that SPM will not do any saving/restoring of these registers on
+	 * behalf of the SP. This falls under the SP's responsibility.
+	 * TTA: Enable access to trace registers.
+	 * ZEN (v8.2): Trap SVE instructions and access to SVE registers.
+	 */
+	write_ctx_reg(get_el1_sysregs_ctx(ctx), CTX_CPACR_EL1,
+			CPACR_EL1_FPEN(CPACR_EL1_FP_TRAP_NONE));
+
+	/*
+	 * Prepare information in buffer shared between EL3 and S-EL0
+	 * ----------------------------------------------------------
+	 */
+
+	void *shared_buf_ptr = (void *) sp_boot_info->sp_shared_buf_base;
+
+	/* Copy the boot information into the shared buffer with the SP. */
+	assert((uintptr_t)shared_buf_ptr + sizeof(spm_mm_boot_info_t)
+	       <= (sp_boot_info->sp_shared_buf_base + sp_boot_info->sp_shared_buf_size));
+
+	assert(sp_boot_info->sp_shared_buf_base <=
+				(UINTPTR_MAX - sp_boot_info->sp_shared_buf_size + 1));
+
+	assert(sp_boot_info != NULL);
+
+	memcpy((void *) shared_buf_ptr, (const void *) sp_boot_info,
+	       sizeof(spm_mm_boot_info_t));
+
+	/* Pointer to the MP information from the platform port. */
+	spm_mm_mp_info_t *sp_mp_info =
+		((spm_mm_boot_info_t *) shared_buf_ptr)->mp_info;
+
+	assert(sp_mp_info != NULL);
+
+	/*
+	 * Point the shared buffer MP information pointer to where the info will
+	 * be populated, just after the boot info.
+	 */
+	((spm_mm_boot_info_t *) shared_buf_ptr)->mp_info =
+		(spm_mm_mp_info_t *) ((uintptr_t)shared_buf_ptr
+				+ sizeof(spm_mm_boot_info_t));
+
+	/*
+	 * Update the shared buffer pointer to where the MP information for the
+	 * payload will be populated
+	 */
+	shared_buf_ptr = ((spm_mm_boot_info_t *) shared_buf_ptr)->mp_info;
+
+	/*
+	 * Copy the cpu information into the shared buffer area after the boot
+	 * information.
+	 */
+	assert(sp_boot_info->num_cpus <= PLATFORM_CORE_COUNT);
+
+	assert((uintptr_t)shared_buf_ptr
+	       <= (sp_boot_info->sp_shared_buf_base + sp_boot_info->sp_shared_buf_size -
+		       (sp_boot_info->num_cpus * sizeof(*sp_mp_info))));
+
+	memcpy(shared_buf_ptr, (const void *) sp_mp_info,
+		sp_boot_info->num_cpus * sizeof(*sp_mp_info));
+
+	/*
+	 * Calculate the linear indices of cores in boot information for the
+	 * secure partition and flag the primary CPU
+	 */
+	sp_mp_info = (spm_mm_mp_info_t *) shared_buf_ptr;
+
+	for (unsigned int index = 0; index < sp_boot_info->num_cpus; index++) {
+		u_register_t mpidr = sp_mp_info[index].mpidr;
+
+		sp_mp_info[index].linear_id = plat_core_pos_by_mpidr(mpidr);
+		if (plat_my_core_pos() == sp_mp_info[index].linear_id)
+			sp_mp_info[index].flags |= MP_INFO_FLAG_PRIMARY_CPU;
+	}
+}
diff --git a/services/std_svc/spm/spm_mm/spm_mm_shim_private.h b/services/std_svc/spm/spm_mm/spm_mm_shim_private.h
new file mode 100644
index 0000000..f69c748
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm_shim_private.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPM_MM_SHIM_PRIVATE_H
+#define SPM_MM_SHIM_PRIVATE_H
+
+#include <stdint.h>
+
+#include <lib/utils_def.h>
+
+/* Assembly source */
+IMPORT_SYM(uintptr_t, spm_shim_exceptions_ptr,		SPM_SHIM_EXCEPTIONS_PTR);
+
+/* Linker symbols */
+IMPORT_SYM(uintptr_t, __SPM_SHIM_EXCEPTIONS_START__,	SPM_SHIM_EXCEPTIONS_START);
+IMPORT_SYM(uintptr_t, __SPM_SHIM_EXCEPTIONS_END__,	SPM_SHIM_EXCEPTIONS_END);
+
+/* Definitions */
+
+#define SPM_SHIM_EXCEPTIONS_SIZE	\
+	(SPM_SHIM_EXCEPTIONS_END - SPM_SHIM_EXCEPTIONS_START)
+
+#endif /* SPM_MM_SHIM_PRIVATE_H */
diff --git a/services/std_svc/spm/spm_mm/spm_mm_xlat.c b/services/std_svc/spm/spm_mm/spm_mm_xlat.c
new file mode 100644
index 0000000..6261016
--- /dev/null
+++ b/services/std_svc/spm/spm_mm/spm_mm_xlat.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <errno.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <platform_def.h>
+#include <plat/common/platform.h>
+#include <services/spm_mm_partition.h>
+#include <services/spm_mm_svc.h>
+
+#include "spm_mm_private.h"
+#include "spm_mm_shim_private.h"
+
+/* Place translation tables by default along with the ones used by BL31. */
+#ifndef PLAT_SP_IMAGE_XLAT_SECTION_NAME
+#define PLAT_SP_IMAGE_XLAT_SECTION_NAME	"xlat_table"
+#endif
+#ifndef PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME
+#define PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME	".bss"
+#endif
+
+/* Allocate and initialise the translation context for the secure partitions. */
+REGISTER_XLAT_CONTEXT2(sp,
+		       PLAT_SP_IMAGE_MMAP_REGIONS,
+		       PLAT_SP_IMAGE_MAX_XLAT_TABLES,
+		       PLAT_VIRT_ADDR_SPACE_SIZE, PLAT_PHY_ADDR_SPACE_SIZE,
+		       EL1_EL0_REGIME, PLAT_SP_IMAGE_XLAT_SECTION_NAME,
+		       PLAT_SP_IMAGE_BASE_XLAT_SECTION_NAME);
+
+/* Lock used for SP_MEMORY_ATTRIBUTES_GET and SP_MEMORY_ATTRIBUTES_SET */
+static spinlock_t mem_attr_smc_lock;
+
+/* Get handle of Secure Partition translation context */
+xlat_ctx_t *spm_get_sp_xlat_context(void)
+{
+	return &sp_xlat_ctx;
+};
+
+/*
+ * Attributes are encoded using a different format in the SMC interface than in
+ * the Trusted Firmware, where the mmap_attr_t enum type is used. This function
+ * converts an attributes value from the SMC format to the mmap_attr_t format by
+ * setting MT_RW/MT_RO, MT_USER/MT_PRIVILEGED and MT_EXECUTE/MT_EXECUTE_NEVER.
+ * The other fields are left as 0 because they are ignored by the function
+ * xlat_change_mem_attributes_ctx().
+ */
+static unsigned int smc_attr_to_mmap_attr(unsigned int attributes)
+{
+	unsigned int tf_attr = 0U;
+
+	unsigned int access = (attributes & MM_SP_MEMORY_ATTRIBUTES_ACCESS_MASK)
+			      >> MM_SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT;
+
+	if (access == MM_SP_MEMORY_ATTRIBUTES_ACCESS_RW) {
+		tf_attr |= MT_RW | MT_USER;
+	} else if (access ==  MM_SP_MEMORY_ATTRIBUTES_ACCESS_RO) {
+		tf_attr |= MT_RO | MT_USER;
+	} else {
+		/* Other values are reserved. */
+		assert(access == MM_SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS);
+		/* The only requirement is that there's no access from EL0 */
+		tf_attr |= MT_RO | MT_PRIVILEGED;
+	}
+
+	if ((attributes & MM_SP_MEMORY_ATTRIBUTES_NON_EXEC) == 0) {
+		tf_attr |= MT_EXECUTE;
+	} else {
+		tf_attr |= MT_EXECUTE_NEVER;
+	}
+
+	return tf_attr;
+}
+
+/*
+ * This function converts attributes from the Trusted Firmware format into the
+ * SMC interface format.
+ */
+static unsigned int smc_mmap_to_smc_attr(unsigned int attr)
+{
+	unsigned int smc_attr = 0U;
+
+	unsigned int data_access;
+
+	if ((attr & MT_USER) == 0) {
+		/* No access from EL0. */
+		data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS;
+	} else {
+		if ((attr & MT_RW) != 0) {
+			assert(MT_TYPE(attr) != MT_DEVICE);
+			data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_RW;
+		} else {
+			data_access = MM_SP_MEMORY_ATTRIBUTES_ACCESS_RO;
+		}
+	}
+
+	smc_attr |= (data_access & MM_SP_MEMORY_ATTRIBUTES_ACCESS_MASK)
+		    << MM_SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT;
+
+	if ((attr & MT_EXECUTE_NEVER) != 0U) {
+		smc_attr |= MM_SP_MEMORY_ATTRIBUTES_NON_EXEC;
+	}
+
+	return smc_attr;
+}
+
+int32_t spm_memory_attributes_get_smc_handler(sp_context_t *sp_ctx,
+					      uintptr_t base_va)
+{
+	uint32_t attributes;
+
+	spin_lock(&mem_attr_smc_lock);
+
+	int rc = xlat_get_mem_attributes_ctx(sp_ctx->xlat_ctx_handle,
+				     base_va, &attributes);
+
+	spin_unlock(&mem_attr_smc_lock);
+
+	/* Convert error codes of xlat_get_mem_attributes_ctx() into SPM. */
+	assert((rc == 0) || (rc == -EINVAL));
+
+	if (rc == 0) {
+		return (int32_t) smc_mmap_to_smc_attr(attributes);
+	} else {
+		return SPM_MM_INVALID_PARAMETER;
+	}
+}
+
+int spm_memory_attributes_set_smc_handler(sp_context_t *sp_ctx,
+					  u_register_t page_address,
+					  u_register_t pages_count,
+					  u_register_t smc_attributes)
+{
+	uintptr_t base_va = (uintptr_t) page_address;
+	size_t size = (size_t) (pages_count * PAGE_SIZE);
+	uint32_t attributes = (uint32_t) smc_attributes;
+
+	INFO("  Start address  : 0x%lx\n", base_va);
+	INFO("  Number of pages: %i (%zi bytes)\n", (int) pages_count, size);
+	INFO("  Attributes     : 0x%x\n", attributes);
+
+	spin_lock(&mem_attr_smc_lock);
+
+	int ret = xlat_change_mem_attributes_ctx(sp_ctx->xlat_ctx_handle,
+					base_va, size,
+					smc_attr_to_mmap_attr(attributes));
+
+	spin_unlock(&mem_attr_smc_lock);
+
+	/* Convert error codes of xlat_change_mem_attributes_ctx() into SPM. */
+	assert((ret == 0) || (ret == -EINVAL));
+
+	return (ret == 0) ? SPM_MM_SUCCESS : SPM_MM_INVALID_PARAMETER;
+}
diff --git a/services/std_svc/spmd/aarch64/spmd_helpers.S b/services/std_svc/spmd/aarch64/spmd_helpers.S
new file mode 100644
index 0000000..d7bffca
--- /dev/null
+++ b/services/std_svc/spmd/aarch64/spmd_helpers.S
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include "../spmd_private.h"
+
+	.global spmd_spm_core_enter
+	.global spmd_spm_core_exit
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with SP_EL0 as stack. Here we stash our EL3
+	 * callee-saved registers on to the stack as a part of saving the C
+	 * runtime and enter the secure payload.
+	 * 'x0' contains a pointer to the memory where the address of the C
+	 *  runtime context is to be saved.
+	 * ---------------------------------------------------------------------
+	 */
+func spmd_spm_core_enter
+	/* Make space for the registers that we're going to save */
+	mov	x3, sp
+	str	x3, [x0, #0]
+	sub	sp, sp, #SPMD_C_RT_CTX_SIZE
+
+	/* Save callee-saved registers on to the stack */
+	stp	x19, x20, [sp, #SPMD_C_RT_CTX_X19]
+	stp	x21, x22, [sp, #SPMD_C_RT_CTX_X21]
+	stp	x23, x24, [sp, #SPMD_C_RT_CTX_X23]
+	stp	x25, x26, [sp, #SPMD_C_RT_CTX_X25]
+	stp	x27, x28, [sp, #SPMD_C_RT_CTX_X27]
+	stp	x29, x30, [sp, #SPMD_C_RT_CTX_X29]
+
+	/* ---------------------------------------------------------------------
+	 * Everything is setup now. el3_exit() will use the secure context to
+	 * restore to the general purpose and EL3 system registers to ERET
+	 * into the secure payload.
+	 * ---------------------------------------------------------------------
+	 */
+	b	el3_exit
+endfunc spmd_spm_core_enter
+
+	/* ---------------------------------------------------------------------
+	 * This function is called with 'x0' pointing to a C runtime context.
+	 * It restores the saved registers and jumps to that runtime with 'x0'
+	 * as the new SP register. This destroys the C runtime context that had
+	 * been built on the stack below the saved context by the caller. Later
+	 * the second parameter 'x1' is passed as a return value to the caller.
+	 * ---------------------------------------------------------------------
+	 */
+func spmd_spm_core_exit
+	/* Restore the previous stack */
+	mov	sp, x0
+
+	/* Restore callee-saved registers on to the stack */
+	ldp	x19, x20, [x0, #(SPMD_C_RT_CTX_X19 - SPMD_C_RT_CTX_SIZE)]
+	ldp	x21, x22, [x0, #(SPMD_C_RT_CTX_X21 - SPMD_C_RT_CTX_SIZE)]
+	ldp	x23, x24, [x0, #(SPMD_C_RT_CTX_X23 - SPMD_C_RT_CTX_SIZE)]
+	ldp	x25, x26, [x0, #(SPMD_C_RT_CTX_X25 - SPMD_C_RT_CTX_SIZE)]
+	ldp	x27, x28, [x0, #(SPMD_C_RT_CTX_X27 - SPMD_C_RT_CTX_SIZE)]
+	ldp	x29, x30, [x0, #(SPMD_C_RT_CTX_X29 - SPMD_C_RT_CTX_SIZE)]
+
+	/* ---------------------------------------------------------------------
+	 * This should take us back to the instruction after the call to the
+	 * last spm_secure_partition_enter().* Place the second parameter to x0
+	 * so that the caller will see it as a return value from the original
+	 * entry call.
+	 * ---------------------------------------------------------------------
+	 */
+	mov	x0, x1
+	ret
+endfunc spmd_spm_core_exit
diff --git a/services/std_svc/spmd/spmd.mk b/services/std_svc/spmd/spmd.mk
new file mode 100644
index 0000000..8efbdc8
--- /dev/null
+++ b/services/std_svc/spmd/spmd.mk
@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ifneq (${ARCH},aarch64)
+	$(error "Error: SPMD is only supported on aarch64.")
+endif
+
+ifeq (${ENABLE_SME_FOR_NS},1)
+	$(error "Error: SPMD is not compatible with ENABLE_SME_FOR_NS")
+endif
+
+SPMD_SOURCES	+=	$(addprefix services/std_svc/spmd/,	\
+			${ARCH}/spmd_helpers.S			\
+			spmd_pm.c				\
+			spmd_main.c)
+
+# Let the top-level Makefile know that we intend to include a BL32 image
+NEED_BL32		:=	yes
+
+# Enable dynamic memory mapping
+# The SPMD component maps the SPMC DTB within BL31 virtual space.
+PLAT_XLAT_TABLES_DYNAMIC :=	1
+$(eval $(call add_define,PLAT_XLAT_TABLES_DYNAMIC))
diff --git a/services/std_svc/spmd/spmd_main.c b/services/std_svc/spmd/spmd_main.c
new file mode 100644
index 0000000..7e6c89d
--- /dev/null
+++ b/services/std_svc/spmd/spmd_main.c
@@ -0,0 +1,937 @@
+/*
+ * Copyright (c) 2020-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <arch_helpers.h>
+#include <arch/aarch64/arch_features.h>
+#include <bl31/bl31.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/smccc.h>
+#include <lib/spinlock.h>
+#include <lib/utils.h>
+#include <plat/common/common_def.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+#include <services/ffa_svc.h>
+#include <services/spmc_svc.h>
+#include <services/spmd_svc.h>
+#include <smccc_helpers.h>
+#include "spmd_private.h"
+
+/*******************************************************************************
+ * SPM Core context information.
+ ******************************************************************************/
+static spmd_spm_core_context_t spm_core_context[PLATFORM_CORE_COUNT];
+
+/*******************************************************************************
+ * SPM Core attribute information is read from its manifest if the SPMC is not
+ * at EL3. Else, it is populated from the SPMC directly.
+ ******************************************************************************/
+static spmc_manifest_attribute_t spmc_attrs;
+
+/*******************************************************************************
+ * SPM Core entry point information. Discovered on the primary core and reused
+ * on secondary cores.
+ ******************************************************************************/
+static entry_point_info_t *spmc_ep_info;
+
+/*******************************************************************************
+ * SPM Core context on CPU based on mpidr.
+ ******************************************************************************/
+spmd_spm_core_context_t *spmd_get_context_by_mpidr(uint64_t mpidr)
+{
+	int core_idx = plat_core_pos_by_mpidr(mpidr);
+
+	if (core_idx < 0) {
+		ERROR("Invalid mpidr: %" PRIx64 ", returned ID: %d\n", mpidr, core_idx);
+		panic();
+	}
+
+	return &spm_core_context[core_idx];
+}
+
+/*******************************************************************************
+ * SPM Core context on current CPU get helper.
+ ******************************************************************************/
+spmd_spm_core_context_t *spmd_get_context(void)
+{
+	return spmd_get_context_by_mpidr(read_mpidr());
+}
+
+/*******************************************************************************
+ * SPM Core ID getter.
+ ******************************************************************************/
+uint16_t spmd_spmc_id_get(void)
+{
+	return spmc_attrs.spmc_id;
+}
+
+/*******************************************************************************
+ * Static function declaration.
+ ******************************************************************************/
+static int32_t spmd_init(void);
+static int spmd_spmc_init(void *pm_addr);
+static uint64_t spmd_ffa_error_return(void *handle,
+				       int error_code);
+static uint64_t spmd_smc_forward(uint32_t smc_fid,
+				 bool secure_origin,
+				 uint64_t x1,
+				 uint64_t x2,
+				 uint64_t x3,
+				 uint64_t x4,
+				 void *cookie,
+				 void *handle,
+				 uint64_t flags);
+
+/******************************************************************************
+ * Builds an SPMD to SPMC direct message request.
+ *****************************************************************************/
+void spmd_build_spmc_message(gp_regs_t *gpregs, uint8_t target_func,
+			     unsigned long long message)
+{
+	write_ctx_reg(gpregs, CTX_GPREG_X0, FFA_MSG_SEND_DIRECT_REQ_SMC32);
+	write_ctx_reg(gpregs, CTX_GPREG_X1,
+		(SPMD_DIRECT_MSG_ENDPOINT_ID << FFA_DIRECT_MSG_SOURCE_SHIFT) |
+		 spmd_spmc_id_get());
+	write_ctx_reg(gpregs, CTX_GPREG_X2, BIT(31) | target_func);
+	write_ctx_reg(gpregs, CTX_GPREG_X3, message);
+}
+
+
+/*******************************************************************************
+ * This function takes an SPMC context pointer and performs a synchronous
+ * SPMC entry.
+ ******************************************************************************/
+uint64_t spmd_spm_core_sync_entry(spmd_spm_core_context_t *spmc_ctx)
+{
+	uint64_t rc;
+
+	assert(spmc_ctx != NULL);
+
+	cm_set_context(&(spmc_ctx->cpu_ctx), SECURE);
+
+	/* Restore the context assigned above */
+#if SPMD_SPM_AT_SEL2
+	cm_el2_sysregs_context_restore(SECURE);
+#else
+	cm_el1_sysregs_context_restore(SECURE);
+#endif
+	cm_set_next_eret_context(SECURE);
+
+	/* Enter SPMC */
+	rc = spmd_spm_core_enter(&spmc_ctx->c_rt_ctx);
+
+	/* Save secure state */
+#if SPMD_SPM_AT_SEL2
+	cm_el2_sysregs_context_save(SECURE);
+#else
+	cm_el1_sysregs_context_save(SECURE);
+#endif
+
+	return rc;
+}
+
+/*******************************************************************************
+ * This function returns to the place where spmd_spm_core_sync_entry() was
+ * called originally.
+ ******************************************************************************/
+__dead2 void spmd_spm_core_sync_exit(uint64_t rc)
+{
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+
+	/* Get current CPU context from SPMC context */
+	assert(cm_get_context(SECURE) == &(ctx->cpu_ctx));
+
+	/*
+	 * The SPMD must have initiated the original request through a
+	 * synchronous entry into SPMC. Jump back to the original C runtime
+	 * context with the value of rc in x0;
+	 */
+	spmd_spm_core_exit(ctx->c_rt_ctx, rc);
+
+	panic();
+}
+
+/*******************************************************************************
+ * Jump to the SPM Core for the first time.
+ ******************************************************************************/
+static int32_t spmd_init(void)
+{
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+	uint64_t rc;
+
+	VERBOSE("SPM Core init start.\n");
+
+	/* Primary boot core enters the SPMC for initialization. */
+	ctx->state = SPMC_STATE_ON_PENDING;
+
+	rc = spmd_spm_core_sync_entry(ctx);
+	if (rc != 0ULL) {
+		ERROR("SPMC initialisation failed 0x%" PRIx64 "\n", rc);
+		return 0;
+	}
+
+	ctx->state = SPMC_STATE_ON;
+
+	VERBOSE("SPM Core init end.\n");
+
+	return 1;
+}
+
+/*******************************************************************************
+ * spmd_secure_interrupt_handler
+ * Enter the SPMC for further handling of the secure interrupt by the SPMC
+ * itself or a Secure Partition.
+ ******************************************************************************/
+static uint64_t spmd_secure_interrupt_handler(uint32_t id,
+					      uint32_t flags,
+					      void *handle,
+					      void *cookie)
+{
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+	gp_regs_t *gpregs = get_gpregs_ctx(&ctx->cpu_ctx);
+	unsigned int linear_id = plat_my_core_pos();
+	int64_t rc;
+
+	/* Sanity check the security state when the exception was generated */
+	assert(get_interrupt_src_ss(flags) == NON_SECURE);
+
+	/* Sanity check the pointer to this cpu's context */
+	assert(handle == cm_get_context(NON_SECURE));
+
+	/* Save the non-secure context before entering SPMC */
+	cm_el1_sysregs_context_save(NON_SECURE);
+#if SPMD_SPM_AT_SEL2
+	cm_el2_sysregs_context_save(NON_SECURE);
+#endif
+
+	/* Convey the event to the SPMC through the FFA_INTERRUPT interface. */
+	write_ctx_reg(gpregs, CTX_GPREG_X0, FFA_INTERRUPT);
+	write_ctx_reg(gpregs, CTX_GPREG_X1, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X2, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X3, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X4, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X5, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X6, 0);
+	write_ctx_reg(gpregs, CTX_GPREG_X7, 0);
+
+	/* Mark current core as handling a secure interrupt. */
+	ctx->secure_interrupt_ongoing = true;
+
+	rc = spmd_spm_core_sync_entry(ctx);
+	if (rc != 0ULL) {
+		ERROR("%s failed (%" PRId64 ") on CPU%u\n", __func__, rc, linear_id);
+	}
+
+	ctx->secure_interrupt_ongoing = false;
+
+	cm_el1_sysregs_context_restore(NON_SECURE);
+#if SPMD_SPM_AT_SEL2
+	cm_el2_sysregs_context_restore(NON_SECURE);
+#endif
+	cm_set_next_eret_context(NON_SECURE);
+
+	SMC_RET0(&ctx->cpu_ctx);
+}
+
+/*******************************************************************************
+ * Loads SPMC manifest and inits SPMC.
+ ******************************************************************************/
+static int spmd_spmc_init(void *pm_addr)
+{
+	cpu_context_t *cpu_ctx;
+	unsigned int core_id;
+	uint32_t ep_attr, flags;
+	int rc;
+
+	/* Load the SPM Core manifest */
+	rc = plat_spm_core_manifest_load(&spmc_attrs, pm_addr);
+	if (rc != 0) {
+		WARN("No or invalid SPM Core manifest image provided by BL2\n");
+		return rc;
+	}
+
+	/*
+	 * Ensure that the SPM Core version is compatible with the SPM
+	 * Dispatcher version.
+	 */
+	if ((spmc_attrs.major_version != FFA_VERSION_MAJOR) ||
+	    (spmc_attrs.minor_version > FFA_VERSION_MINOR)) {
+		WARN("Unsupported FFA version (%u.%u)\n",
+		     spmc_attrs.major_version, spmc_attrs.minor_version);
+		return -EINVAL;
+	}
+
+	VERBOSE("FFA version (%u.%u)\n", spmc_attrs.major_version,
+	     spmc_attrs.minor_version);
+
+	VERBOSE("SPM Core run time EL%x.\n",
+	     SPMD_SPM_AT_SEL2 ? MODE_EL2 : MODE_EL1);
+
+	/* Validate the SPMC ID, Ensure high bit is set */
+	if (((spmc_attrs.spmc_id >> SPMC_SECURE_ID_SHIFT) &
+			SPMC_SECURE_ID_MASK) == 0U) {
+		WARN("Invalid ID (0x%x) for SPMC.\n", spmc_attrs.spmc_id);
+		return -EINVAL;
+	}
+
+	/* Validate the SPM Core execution state */
+	if ((spmc_attrs.exec_state != MODE_RW_64) &&
+	    (spmc_attrs.exec_state != MODE_RW_32)) {
+		WARN("Unsupported %s%x.\n", "SPM Core execution state 0x",
+		     spmc_attrs.exec_state);
+		return -EINVAL;
+	}
+
+	VERBOSE("%s%x.\n", "SPM Core execution state 0x",
+		spmc_attrs.exec_state);
+
+#if SPMD_SPM_AT_SEL2
+	/* Ensure manifest has not requested AArch32 state in S-EL2 */
+	if (spmc_attrs.exec_state == MODE_RW_32) {
+		WARN("AArch32 state at S-EL2 is not supported.\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Check if S-EL2 is supported on this system if S-EL2
+	 * is required for SPM
+	 */
+	if (!is_armv8_4_sel2_present()) {
+		WARN("SPM Core run time S-EL2 is not supported.\n");
+		return -EINVAL;
+	}
+#endif /* SPMD_SPM_AT_SEL2 */
+
+	/* Initialise an entrypoint to set up the CPU context */
+	ep_attr = SECURE | EP_ST_ENABLE;
+	if ((read_sctlr_el3() & SCTLR_EE_BIT) != 0ULL) {
+		ep_attr |= EP_EE_BIG;
+	}
+
+	SET_PARAM_HEAD(spmc_ep_info, PARAM_EP, VERSION_1, ep_attr);
+
+	/*
+	 * Populate SPSR for SPM Core based upon validated parameters from the
+	 * manifest.
+	 */
+	if (spmc_attrs.exec_state == MODE_RW_32) {
+		spmc_ep_info->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM,
+						 SPSR_E_LITTLE,
+						 DAIF_FIQ_BIT |
+						 DAIF_IRQ_BIT |
+						 DAIF_ABT_BIT);
+	} else {
+
+#if SPMD_SPM_AT_SEL2
+		static const uint32_t runtime_el = MODE_EL2;
+#else
+		static const uint32_t runtime_el = MODE_EL1;
+#endif
+		spmc_ep_info->spsr = SPSR_64(runtime_el,
+					     MODE_SP_ELX,
+					     DISABLE_ALL_EXCEPTIONS);
+	}
+
+	/* Set an initial SPMC context state for all cores. */
+	for (core_id = 0U; core_id < PLATFORM_CORE_COUNT; core_id++) {
+		spm_core_context[core_id].state = SPMC_STATE_OFF;
+
+		/* Setup an initial cpu context for the SPMC. */
+		cpu_ctx = &spm_core_context[core_id].cpu_ctx;
+		cm_setup_context(cpu_ctx, spmc_ep_info);
+
+		/*
+		 * Pass the core linear ID to the SPMC through x4.
+		 * (TF-A implementation defined behavior helping
+		 * a legacy TOS migration to adopt FF-A).
+		 */
+		write_ctx_reg(get_gpregs_ctx(cpu_ctx), CTX_GPREG_X4, core_id);
+	}
+
+	/* Register power management hooks with PSCI */
+	psci_register_spd_pm_hook(&spmd_pm);
+
+	/* Register init function for deferred init. */
+	bl31_register_bl32_init(&spmd_init);
+
+	INFO("SPM Core setup done.\n");
+
+	/*
+	 * Register an interrupt handler routing secure interrupts to SPMD
+	 * while the NWd is running.
+	 */
+	flags = 0;
+	set_interrupt_rm_flag(flags, NON_SECURE);
+	rc = register_interrupt_type_handler(INTR_TYPE_S_EL1,
+					     spmd_secure_interrupt_handler,
+					     flags);
+	if (rc != 0) {
+		panic();
+	}
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Initialize context of SPM Core.
+ ******************************************************************************/
+int spmd_setup(void)
+{
+	int rc;
+	void *spmc_manifest;
+
+	/*
+	 * If the SPMC is at EL3, then just initialise it directly. The
+	 * shenanigans of when it is at a lower EL are not needed.
+	 */
+	if (is_spmc_at_el3()) {
+		/* Allow the SPMC to populate its attributes directly. */
+		spmc_populate_attrs(&spmc_attrs);
+
+		rc = spmc_setup();
+		if (rc != 0) {
+			ERROR("SPMC initialisation failed 0x%x.\n", rc);
+		}
+		return rc;
+	}
+
+	spmc_ep_info = bl31_plat_get_next_image_ep_info(SECURE);
+	if (spmc_ep_info == NULL) {
+		WARN("No SPM Core image provided by BL2 boot loader.\n");
+		return -EINVAL;
+	}
+
+	/* Under no circumstances will this parameter be 0 */
+	assert(spmc_ep_info->pc != 0ULL);
+
+	/*
+	 * Check if BL32 ep_info has a reference to 'tos_fw_config'. This will
+	 * be used as a manifest for the SPM Core at the next lower EL/mode.
+	 */
+	spmc_manifest = (void *)spmc_ep_info->args.arg0;
+	if (spmc_manifest == NULL) {
+		ERROR("Invalid or absent SPM Core manifest.\n");
+		return -EINVAL;
+	}
+
+	/* Load manifest, init SPMC */
+	rc = spmd_spmc_init(spmc_manifest);
+	if (rc != 0) {
+		WARN("Booting device without SPM initialization.\n");
+	}
+
+	return rc;
+}
+
+/*******************************************************************************
+ * Forward FF-A SMCs to the other security state.
+ ******************************************************************************/
+uint64_t spmd_smc_switch_state(uint32_t smc_fid,
+			       bool secure_origin,
+			       uint64_t x1,
+			       uint64_t x2,
+			       uint64_t x3,
+			       uint64_t x4,
+			       void *handle)
+{
+	unsigned int secure_state_in = (secure_origin) ? SECURE : NON_SECURE;
+	unsigned int secure_state_out = (!secure_origin) ? SECURE : NON_SECURE;
+
+	/* Save incoming security state */
+#if SPMD_SPM_AT_SEL2
+	if (secure_state_in == NON_SECURE) {
+		cm_el1_sysregs_context_save(secure_state_in);
+	}
+	cm_el2_sysregs_context_save(secure_state_in);
+#else
+	cm_el1_sysregs_context_save(secure_state_in);
+#endif
+
+	/* Restore outgoing security state */
+#if SPMD_SPM_AT_SEL2
+	if (secure_state_out == NON_SECURE) {
+		cm_el1_sysregs_context_restore(secure_state_out);
+	}
+	cm_el2_sysregs_context_restore(secure_state_out);
+#else
+	cm_el1_sysregs_context_restore(secure_state_out);
+#endif
+	cm_set_next_eret_context(secure_state_out);
+
+	SMC_RET8(cm_get_context(secure_state_out), smc_fid, x1, x2, x3, x4,
+			SMC_GET_GP(handle, CTX_GPREG_X5),
+			SMC_GET_GP(handle, CTX_GPREG_X6),
+			SMC_GET_GP(handle, CTX_GPREG_X7));
+}
+
+/*******************************************************************************
+ * Forward SMCs to the other security state.
+ ******************************************************************************/
+static uint64_t spmd_smc_forward(uint32_t smc_fid,
+				 bool secure_origin,
+				 uint64_t x1,
+				 uint64_t x2,
+				 uint64_t x3,
+				 uint64_t x4,
+				 void *cookie,
+				 void *handle,
+				 uint64_t flags)
+{
+	if (is_spmc_at_el3() && !secure_origin) {
+		return spmc_smc_handler(smc_fid, secure_origin, x1, x2, x3, x4,
+					cookie, handle, flags);
+	}
+	return spmd_smc_switch_state(smc_fid, secure_origin, x1, x2, x3, x4,
+				     handle);
+
+}
+
+/*******************************************************************************
+ * Return FFA_ERROR with specified error code
+ ******************************************************************************/
+static uint64_t spmd_ffa_error_return(void *handle, int error_code)
+{
+	SMC_RET8(handle, (uint32_t) FFA_ERROR,
+		 FFA_TARGET_INFO_MBZ, (uint32_t)error_code,
+		 FFA_PARAM_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+		 FFA_PARAM_MBZ, FFA_PARAM_MBZ);
+}
+
+/*******************************************************************************
+ * spmd_check_address_in_binary_image
+ ******************************************************************************/
+bool spmd_check_address_in_binary_image(uint64_t address)
+{
+	assert(!check_uptr_overflow(spmc_attrs.load_address, spmc_attrs.binary_size));
+
+	return ((address >= spmc_attrs.load_address) &&
+		(address < (spmc_attrs.load_address + spmc_attrs.binary_size)));
+}
+
+/******************************************************************************
+ * spmd_is_spmc_message
+ *****************************************************************************/
+static bool spmd_is_spmc_message(unsigned int ep)
+{
+	if (is_spmc_at_el3()) {
+		return false;
+	}
+
+	return ((ffa_endpoint_destination(ep) == SPMD_DIRECT_MSG_ENDPOINT_ID)
+		&& (ffa_endpoint_source(ep) == spmc_attrs.spmc_id));
+}
+
+/******************************************************************************
+ * spmd_handle_spmc_message
+ *****************************************************************************/
+static int spmd_handle_spmc_message(unsigned long long msg,
+		unsigned long long parm1, unsigned long long parm2,
+		unsigned long long parm3, unsigned long long parm4)
+{
+	VERBOSE("%s %llx %llx %llx %llx %llx\n", __func__,
+		msg, parm1, parm2, parm3, parm4);
+
+	return -EINVAL;
+}
+
+/*******************************************************************************
+ * This function forwards FF-A SMCs to either the main SPMD handler or the
+ * SPMC at EL3, depending on the origin security state, if enabled.
+ ******************************************************************************/
+uint64_t spmd_ffa_smc_handler(uint32_t smc_fid,
+			      uint64_t x1,
+			      uint64_t x2,
+			      uint64_t x3,
+			      uint64_t x4,
+			      void *cookie,
+			      void *handle,
+			      uint64_t flags)
+{
+	if (is_spmc_at_el3()) {
+		/*
+		 * If we have an SPMC at EL3 allow handling of the SMC first.
+		 * The SPMC will call back through to SPMD handler if required.
+		 */
+		if (is_caller_secure(flags)) {
+			return spmc_smc_handler(smc_fid,
+						is_caller_secure(flags),
+						x1, x2, x3, x4, cookie,
+						handle, flags);
+		}
+	}
+	return spmd_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+				handle, flags);
+}
+
+/*******************************************************************************
+ * This function handles all SMCs in the range reserved for FFA. Each call is
+ * either forwarded to the other security state or handled by the SPM dispatcher
+ ******************************************************************************/
+uint64_t spmd_smc_handler(uint32_t smc_fid,
+			  uint64_t x1,
+			  uint64_t x2,
+			  uint64_t x3,
+			  uint64_t x4,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	unsigned int linear_id = plat_my_core_pos();
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+	bool secure_origin;
+	int32_t ret;
+	uint32_t input_version;
+
+	/* Determine which security state this SMC originated from */
+	secure_origin = is_caller_secure(flags);
+
+	VERBOSE("SPM(%u): 0x%x 0x%" PRIx64 " 0x%" PRIx64 " 0x%" PRIx64 " 0x%" PRIx64
+		" 0x%" PRIx64 " 0x%" PRIx64 " 0x%" PRIx64 "\n",
+		    linear_id, smc_fid, x1, x2, x3, x4,
+		    SMC_GET_GP(handle, CTX_GPREG_X5),
+		    SMC_GET_GP(handle, CTX_GPREG_X6),
+		    SMC_GET_GP(handle, CTX_GPREG_X7));
+
+	switch (smc_fid) {
+	case FFA_ERROR:
+		/*
+		 * Check if this is the first invocation of this interface on
+		 * this CPU. If so, then indicate that the SPM Core initialised
+		 * unsuccessfully.
+		 */
+		if (secure_origin && (ctx->state == SPMC_STATE_ON_PENDING)) {
+			spmd_spm_core_sync_exit(x2);
+		}
+
+		return spmd_smc_forward(smc_fid, secure_origin,
+					x1, x2, x3, x4, cookie,
+					handle, flags);
+		break; /* not reached */
+
+	case FFA_VERSION:
+		input_version = (uint32_t)(0xFFFFFFFF & x1);
+		/*
+		 * If caller is secure and SPMC was initialized,
+		 * return FFA_VERSION of SPMD.
+		 * If caller is non secure and SPMC was initialized,
+		 * forward to the EL3 SPMC if enabled, otherwise return
+		 * the SPMC version if implemented at a lower EL.
+		 * Sanity check to "input_version".
+		 * If the EL3 SPMC is enabled, ignore the SPMC state as
+		 * this is not used.
+		 */
+		if ((input_version & FFA_VERSION_BIT31_MASK) ||
+		    (!is_spmc_at_el3() && (ctx->state == SPMC_STATE_RESET))) {
+			ret = FFA_ERROR_NOT_SUPPORTED;
+		} else if (!secure_origin) {
+			if (is_spmc_at_el3()) {
+				/*
+				 * Forward the call directly to the EL3 SPMC, if
+				 * enabled, as we don't need to wrap the call in
+				 * a direct request.
+				 */
+				return spmd_smc_forward(smc_fid, secure_origin,
+							x1, x2, x3, x4, cookie,
+							handle, flags);
+			}
+
+			gp_regs_t *gpregs = get_gpregs_ctx(&ctx->cpu_ctx);
+			uint64_t rc;
+
+			if (spmc_attrs.major_version == 1 &&
+			    spmc_attrs.minor_version == 0) {
+				ret = MAKE_FFA_VERSION(spmc_attrs.major_version,
+						       spmc_attrs.minor_version);
+				SMC_RET8(handle, (uint32_t)ret,
+					 FFA_TARGET_INFO_MBZ,
+					 FFA_TARGET_INFO_MBZ,
+					 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					 FFA_PARAM_MBZ);
+				break;
+			}
+			/* Save non-secure system registers context */
+			cm_el1_sysregs_context_save(NON_SECURE);
+#if SPMD_SPM_AT_SEL2
+			cm_el2_sysregs_context_save(NON_SECURE);
+#endif
+
+			/*
+			 * The incoming request has FFA_VERSION as X0 smc_fid
+			 * and requested version in x1. Prepare a direct request
+			 * from SPMD to SPMC with FFA_VERSION framework function
+			 * identifier in X2 and requested version in X3.
+			 */
+			spmd_build_spmc_message(gpregs,
+						SPMD_FWK_MSG_FFA_VERSION_REQ,
+						input_version);
+
+			rc = spmd_spm_core_sync_entry(ctx);
+
+			if ((rc != 0ULL) ||
+			    (SMC_GET_GP(gpregs, CTX_GPREG_X0) !=
+				FFA_MSG_SEND_DIRECT_RESP_SMC32) ||
+			    (SMC_GET_GP(gpregs, CTX_GPREG_X2) !=
+				(FFA_FWK_MSG_BIT |
+				 SPMD_FWK_MSG_FFA_VERSION_RESP))) {
+				ERROR("Failed to forward FFA_VERSION\n");
+				ret = FFA_ERROR_NOT_SUPPORTED;
+			} else {
+				ret = SMC_GET_GP(gpregs, CTX_GPREG_X3);
+			}
+
+			/*
+			 * Return here after SPMC has handled FFA_VERSION.
+			 * The returned SPMC version is held in X3.
+			 * Forward this version in X0 to the non-secure caller.
+			 */
+			return spmd_smc_forward(ret, true, FFA_PARAM_MBZ,
+						FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+						FFA_PARAM_MBZ, cookie, gpregs,
+						flags);
+		} else {
+			ret = MAKE_FFA_VERSION(FFA_VERSION_MAJOR,
+					       FFA_VERSION_MINOR);
+		}
+
+		SMC_RET8(handle, (uint32_t)ret, FFA_TARGET_INFO_MBZ,
+			 FFA_TARGET_INFO_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+			 FFA_PARAM_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ);
+		break; /* not reached */
+
+	case FFA_FEATURES:
+		/*
+		 * This is an optional interface. Do the minimal checks and
+		 * forward to SPM Core which will handle it if implemented.
+		 */
+
+		/* Forward SMC from Normal world to the SPM Core */
+		if (!secure_origin) {
+			return spmd_smc_forward(smc_fid, secure_origin,
+						x1, x2, x3, x4, cookie,
+						handle, flags);
+		}
+
+		/*
+		 * Return success if call was from secure world i.e. all
+		 * FFA functions are supported. This is essentially a
+		 * nop.
+		 */
+		SMC_RET8(handle, FFA_SUCCESS_SMC32, x1, x2, x3, x4,
+			 SMC_GET_GP(handle, CTX_GPREG_X5),
+			 SMC_GET_GP(handle, CTX_GPREG_X6),
+			 SMC_GET_GP(handle, CTX_GPREG_X7));
+
+		break; /* not reached */
+
+	case FFA_ID_GET:
+		/*
+		 * Returns the ID of the calling FFA component.
+		 */
+		if (!secure_origin) {
+			SMC_RET8(handle, FFA_SUCCESS_SMC32,
+				 FFA_TARGET_INFO_MBZ, FFA_NS_ENDPOINT_ID,
+				 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				 FFA_PARAM_MBZ);
+		}
+
+		SMC_RET8(handle, FFA_SUCCESS_SMC32,
+			 FFA_TARGET_INFO_MBZ, spmc_attrs.spmc_id,
+			 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+			 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+			 FFA_PARAM_MBZ);
+
+		break; /* not reached */
+
+	case FFA_SECONDARY_EP_REGISTER_SMC64:
+		if (secure_origin) {
+			ret = spmd_pm_secondary_ep_register(x1);
+
+			if (ret < 0) {
+				SMC_RET8(handle, FFA_ERROR_SMC64,
+					FFA_TARGET_INFO_MBZ, ret,
+					FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					FFA_PARAM_MBZ);
+			} else {
+				SMC_RET8(handle, FFA_SUCCESS_SMC64,
+					FFA_TARGET_INFO_MBZ, FFA_PARAM_MBZ,
+					FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+					FFA_PARAM_MBZ);
+			}
+		}
+
+		return spmd_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+		break; /* Not reached */
+
+	case FFA_SPM_ID_GET:
+		if (MAKE_FFA_VERSION(1, 1) > FFA_VERSION_COMPILED) {
+			return spmd_ffa_error_return(handle,
+						     FFA_ERROR_NOT_SUPPORTED);
+		}
+		/*
+		 * Returns the ID of the SPMC or SPMD depending on the FF-A
+		 * instance where this function is invoked
+		 */
+		if (!secure_origin) {
+			SMC_RET8(handle, FFA_SUCCESS_SMC32,
+				 FFA_TARGET_INFO_MBZ, spmc_attrs.spmc_id,
+				 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				 FFA_PARAM_MBZ);
+		}
+		SMC_RET8(handle, FFA_SUCCESS_SMC32,
+			 FFA_TARGET_INFO_MBZ, SPMD_DIRECT_MSG_ENDPOINT_ID,
+			 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+			 FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+			 FFA_PARAM_MBZ);
+
+		break; /* not reached */
+
+	case FFA_MSG_SEND_DIRECT_REQ_SMC32:
+	case FFA_MSG_SEND_DIRECT_REQ_SMC64:
+		if (!secure_origin) {
+			/* Validate source endpoint is non-secure for non-secure caller. */
+			if (ffa_is_secure_world_id(ffa_endpoint_source(x1))) {
+				return spmd_ffa_error_return(handle,
+						FFA_ERROR_INVALID_PARAMETER);
+			}
+		}
+		if (secure_origin && spmd_is_spmc_message(x1)) {
+			ret = spmd_handle_spmc_message(x3, x4,
+				SMC_GET_GP(handle, CTX_GPREG_X5),
+				SMC_GET_GP(handle, CTX_GPREG_X6),
+				SMC_GET_GP(handle, CTX_GPREG_X7));
+
+			SMC_RET8(handle, FFA_SUCCESS_SMC32,
+				FFA_TARGET_INFO_MBZ, ret,
+				FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				FFA_PARAM_MBZ, FFA_PARAM_MBZ,
+				FFA_PARAM_MBZ);
+		} else {
+			/* Forward direct message to the other world */
+			return spmd_smc_forward(smc_fid, secure_origin,
+						x1, x2, x3, x4, cookie,
+						handle, flags);
+		}
+		break; /* Not reached */
+
+	case FFA_MSG_SEND_DIRECT_RESP_SMC32:
+		if (secure_origin && spmd_is_spmc_message(x1)) {
+			spmd_spm_core_sync_exit(0ULL);
+		} else {
+			/* Forward direct message to the other world */
+			return spmd_smc_forward(smc_fid, secure_origin,
+						x1, x2, x3, x4, cookie,
+						handle, flags);
+		}
+		break; /* Not reached */
+
+	case FFA_RX_RELEASE:
+	case FFA_RXTX_MAP_SMC32:
+	case FFA_RXTX_MAP_SMC64:
+	case FFA_RXTX_UNMAP:
+	case FFA_PARTITION_INFO_GET:
+#if MAKE_FFA_VERSION(1, 1) <= FFA_VERSION_COMPILED
+	case FFA_NOTIFICATION_BITMAP_CREATE:
+	case FFA_NOTIFICATION_BITMAP_DESTROY:
+	case FFA_NOTIFICATION_BIND:
+	case FFA_NOTIFICATION_UNBIND:
+	case FFA_NOTIFICATION_SET:
+	case FFA_NOTIFICATION_GET:
+	case FFA_NOTIFICATION_INFO_GET:
+	case FFA_NOTIFICATION_INFO_GET_SMC64:
+	case FFA_MSG_SEND2:
+	case FFA_RX_ACQUIRE:
+#endif
+	case FFA_MSG_RUN:
+		/*
+		 * Above calls should be invoked only by the Normal world and
+		 * must not be forwarded from Secure world to Normal world.
+		 */
+		if (secure_origin) {
+			return spmd_ffa_error_return(handle,
+						     FFA_ERROR_NOT_SUPPORTED);
+		}
+
+		/* Fall through to forward the call to the other world */
+	case FFA_MSG_SEND:
+	case FFA_MSG_SEND_DIRECT_RESP_SMC64:
+	case FFA_MEM_DONATE_SMC32:
+	case FFA_MEM_DONATE_SMC64:
+	case FFA_MEM_LEND_SMC32:
+	case FFA_MEM_LEND_SMC64:
+	case FFA_MEM_SHARE_SMC32:
+	case FFA_MEM_SHARE_SMC64:
+	case FFA_MEM_RETRIEVE_REQ_SMC32:
+	case FFA_MEM_RETRIEVE_REQ_SMC64:
+	case FFA_MEM_RETRIEVE_RESP:
+	case FFA_MEM_RELINQUISH:
+	case FFA_MEM_RECLAIM:
+	case FFA_MEM_FRAG_TX:
+	case FFA_MEM_FRAG_RX:
+	case FFA_SUCCESS_SMC32:
+	case FFA_SUCCESS_SMC64:
+		/*
+		 * TODO: Assume that no requests originate from EL3 at the
+		 * moment. This will change if a SP service is required in
+		 * response to secure interrupts targeted to EL3. Until then
+		 * simply forward the call to the Normal world.
+		 */
+
+		return spmd_smc_forward(smc_fid, secure_origin,
+					x1, x2, x3, x4, cookie,
+					handle, flags);
+		break; /* not reached */
+
+	case FFA_MSG_WAIT:
+		/*
+		 * Check if this is the first invocation of this interface on
+		 * this CPU from the Secure world. If so, then indicate that the
+		 * SPM Core initialised successfully.
+		 */
+		if (secure_origin && (ctx->state == SPMC_STATE_ON_PENDING)) {
+			spmd_spm_core_sync_exit(0ULL);
+		}
+
+		/* Fall through to forward the call to the other world */
+	case FFA_INTERRUPT:
+	case FFA_MSG_YIELD:
+		/* This interface must be invoked only by the Secure world */
+		if (!secure_origin) {
+			return spmd_ffa_error_return(handle,
+						      FFA_ERROR_NOT_SUPPORTED);
+		}
+
+		return spmd_smc_forward(smc_fid, secure_origin,
+					x1, x2, x3, x4, cookie,
+					handle, flags);
+		break; /* not reached */
+
+	case FFA_NORMAL_WORLD_RESUME:
+		if (secure_origin && ctx->secure_interrupt_ongoing) {
+			spmd_spm_core_sync_exit(0ULL);
+		} else {
+			return spmd_ffa_error_return(handle, FFA_ERROR_DENIED);
+		}
+		break; /* Not reached */
+
+	default:
+		WARN("SPM: Unsupported call 0x%08x\n", smc_fid);
+		return spmd_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED);
+	}
+}
diff --git a/services/std_svc/spmd/spmd_pm.c b/services/std_svc/spmd/spmd_pm.c
new file mode 100644
index 0000000..a2704dd
--- /dev/null
+++ b/services/std_svc/spmd/spmd_pm.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2020-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/spinlock.h>
+#include "spmd_private.h"
+
+static struct {
+	bool secondary_ep_locked;
+	uintptr_t secondary_ep;
+	spinlock_t lock;
+} g_spmd_pm;
+
+/*******************************************************************************
+ * spmd_pm_secondary_ep_register
+ ******************************************************************************/
+int spmd_pm_secondary_ep_register(uintptr_t entry_point)
+{
+	int ret = FFA_ERROR_INVALID_PARAMETER;
+
+	spin_lock(&g_spmd_pm.lock);
+
+	if (g_spmd_pm.secondary_ep_locked == true) {
+		goto out;
+	}
+
+	/*
+	 * Check entry_point address is a PA within
+	 * load_address <= entry_point < load_address + binary_size
+	 */
+	if (!spmd_check_address_in_binary_image(entry_point)) {
+		ERROR("%s entry point is not within image boundaries\n",
+			__func__);
+		goto out;
+	}
+
+	g_spmd_pm.secondary_ep = entry_point;
+	g_spmd_pm.secondary_ep_locked = true;
+
+	VERBOSE("%s %lx\n", __func__, entry_point);
+
+	ret = 0;
+
+out:
+	spin_unlock(&g_spmd_pm.lock);
+
+	return ret;
+}
+
+/*******************************************************************************
+ * This CPU has been turned on. Enter SPMC to initialise S-EL1 or S-EL2. As part
+ * of the SPMC initialization path, they will initialize any SPs that they
+ * manage. Entry into SPMC is done after initialising minimal architectural
+ * state that guarantees safe execution.
+ ******************************************************************************/
+static void spmd_cpu_on_finish_handler(u_register_t unused)
+{
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+	unsigned int linear_id = plat_my_core_pos();
+	el3_state_t *el3_state;
+	uintptr_t entry_point;
+	uint64_t rc;
+
+	assert(ctx != NULL);
+	assert(ctx->state != SPMC_STATE_ON);
+
+	spin_lock(&g_spmd_pm.lock);
+
+	/*
+	 * Leave the possibility that the SPMC does not call
+	 * FFA_SECONDARY_EP_REGISTER in which case re-use the
+	 * primary core address for booting secondary cores.
+	 */
+	if (g_spmd_pm.secondary_ep_locked == true) {
+		/*
+		 * The CPU context has already been initialized at boot time
+		 * (in spmd_spmc_init by a call to cm_setup_context). Adjust
+		 * below the target core entry point based on the address
+		 * passed to by FFA_SECONDARY_EP_REGISTER.
+		 */
+		entry_point = g_spmd_pm.secondary_ep;
+		el3_state = get_el3state_ctx(&ctx->cpu_ctx);
+		write_ctx_reg(el3_state, CTX_ELR_EL3, entry_point);
+	}
+
+	spin_unlock(&g_spmd_pm.lock);
+
+	/* Mark CPU as initiating ON operation. */
+	ctx->state = SPMC_STATE_ON_PENDING;
+
+	rc = spmd_spm_core_sync_entry(ctx);
+	if (rc != 0ULL) {
+		ERROR("%s failed (%" PRIu64 ") on CPU%u\n", __func__, rc,
+			linear_id);
+		ctx->state = SPMC_STATE_OFF;
+		return;
+	}
+
+	ctx->state = SPMC_STATE_ON;
+
+	VERBOSE("CPU %u on!\n", linear_id);
+}
+
+/*******************************************************************************
+ * spmd_cpu_off_handler
+ ******************************************************************************/
+static int32_t spmd_cpu_off_handler(u_register_t unused)
+{
+	spmd_spm_core_context_t *ctx = spmd_get_context();
+	unsigned int linear_id = plat_my_core_pos();
+	int64_t rc;
+
+	assert(ctx != NULL);
+	assert(ctx->state != SPMC_STATE_OFF);
+
+	/* Build an SPMD to SPMC direct message request. */
+	spmd_build_spmc_message(get_gpregs_ctx(&ctx->cpu_ctx),
+				FFA_FWK_MSG_PSCI, PSCI_CPU_OFF);
+
+	rc = spmd_spm_core_sync_entry(ctx);
+	if (rc != 0ULL) {
+		ERROR("%s failed (%" PRIu64 ") on CPU%u\n", __func__, rc, linear_id);
+	}
+
+	/* Expect a direct message response from the SPMC. */
+	u_register_t ffa_resp_func = read_ctx_reg(get_gpregs_ctx(&ctx->cpu_ctx),
+						  CTX_GPREG_X0);
+	if (ffa_resp_func != FFA_MSG_SEND_DIRECT_RESP_SMC32) {
+		ERROR("%s invalid SPMC response (%lx).\n",
+			__func__, ffa_resp_func);
+		return -EINVAL;
+	}
+
+	ctx->state = SPMC_STATE_OFF;
+
+	VERBOSE("CPU %u off!\n", linear_id);
+
+	return 0;
+}
+
+/*******************************************************************************
+ * Structure populated by the SPM Dispatcher to perform any bookkeeping before
+ * PSCI executes a power mgmt. operation.
+ ******************************************************************************/
+const spd_pm_ops_t spmd_pm = {
+	.svc_on_finish = spmd_cpu_on_finish_handler,
+	.svc_off = spmd_cpu_off_handler
+};
diff --git a/services/std_svc/spmd/spmd_private.h b/services/std_svc/spmd/spmd_private.h
new file mode 100644
index 0000000..d21a622
--- /dev/null
+++ b/services/std_svc/spmd/spmd_private.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2019-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPMD_PRIVATE_H
+#define SPMD_PRIVATE_H
+
+#include <common/bl_common.h>
+#include <context.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to preserve callee-saved registers of the
+ * C runtime context while performing a security state switch.
+ ******************************************************************************/
+#define SPMD_C_RT_CTX_X19		0x0
+#define SPMD_C_RT_CTX_X20		0x8
+#define SPMD_C_RT_CTX_X21		0x10
+#define SPMD_C_RT_CTX_X22		0x18
+#define SPMD_C_RT_CTX_X23		0x20
+#define SPMD_C_RT_CTX_X24		0x28
+#define SPMD_C_RT_CTX_X25		0x30
+#define SPMD_C_RT_CTX_X26		0x38
+#define SPMD_C_RT_CTX_X27		0x40
+#define SPMD_C_RT_CTX_X28		0x48
+#define SPMD_C_RT_CTX_X29		0x50
+#define SPMD_C_RT_CTX_X30		0x58
+
+#define SPMD_C_RT_CTX_SIZE		0x60
+#define SPMD_C_RT_CTX_ENTRIES		(SPMD_C_RT_CTX_SIZE >> DWORD_SHIFT)
+
+#ifndef __ASSEMBLER__
+#include <stdint.h>
+#include <lib/psci/psci_lib.h>
+#include <plat/common/platform.h>
+#include <services/ffa_svc.h>
+
+typedef enum spmc_state {
+	SPMC_STATE_RESET = 0,
+	SPMC_STATE_OFF,
+	SPMC_STATE_ON_PENDING,
+	SPMC_STATE_ON
+} spmc_state_t;
+
+/*
+ * Data structure used by the SPM dispatcher (SPMD) in EL3 to track context of
+ * the SPM core (SPMC) at the next lower EL.
+ */
+typedef struct spmd_spm_core_context {
+	uint64_t c_rt_ctx;
+	cpu_context_t cpu_ctx;
+	spmc_state_t state;
+	bool secure_interrupt_ongoing;
+} spmd_spm_core_context_t;
+
+/*
+ * Reserve ID for NS physical FFA Endpoint.
+ */
+#define FFA_NS_ENDPOINT_ID			U(0)
+
+/* Define SPMD target function IDs for framework messages to the SPMC */
+#define SPMD_FWK_MSG_FFA_VERSION_REQ		U(0x8)
+#define SPMD_FWK_MSG_FFA_VERSION_RESP		U(0x9)
+
+/* Function to build SPMD to SPMC message */
+void spmd_build_spmc_message(gp_regs_t *gpregs, uint8_t target,
+			     unsigned long long message);
+
+/* Functions used to enter/exit SPMC synchronously */
+uint64_t spmd_spm_core_sync_entry(spmd_spm_core_context_t *ctx);
+__dead2 void spmd_spm_core_sync_exit(uint64_t rc);
+
+/* Assembly helpers */
+uint64_t spmd_spm_core_enter(uint64_t *c_rt_ctx);
+void __dead2 spmd_spm_core_exit(uint64_t c_rt_ctx, uint64_t ret);
+
+/* SPMD SPD power management handlers */
+extern const spd_pm_ops_t spmd_pm;
+
+/* SPMC entry point information helper */
+entry_point_info_t *spmd_spmc_ep_info_get(void);
+
+/* SPMC ID getter */
+uint16_t spmd_spmc_id_get(void);
+
+/* SPMC context on CPU based on mpidr */
+spmd_spm_core_context_t *spmd_get_context_by_mpidr(uint64_t mpidr);
+
+/* SPMC context on current CPU get helper */
+spmd_spm_core_context_t *spmd_get_context(void);
+
+int spmd_pm_secondary_ep_register(uintptr_t entry_point);
+bool spmd_check_address_in_binary_image(uint64_t address);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* SPMD_PRIVATE_H */
diff --git a/services/std_svc/std_svc_setup.c b/services/std_svc/std_svc_setup.c
new file mode 100644
index 0000000..2884a3b
--- /dev/null
+++ b/services/std_svc/std_svc_setup.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (c) 2014-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <lib/el3_runtime/cpu_data.h>
+#include <lib/pmf/pmf.h>
+#include <lib/psci/psci.h>
+#include <lib/runtime_instr.h>
+#include <services/drtm_svc.h>
+#include <services/pci_svc.h>
+#include <services/rmmd_svc.h>
+#include <services/sdei.h>
+#include <services/spm_mm_svc.h>
+#include <services/spmc_svc.h>
+#include <services/spmd_svc.h>
+#include <services/std_svc.h>
+#include <services/trng_svc.h>
+#include <smccc_helpers.h>
+#include <tools_share/uuid.h>
+
+/* Standard Service UUID */
+static uuid_t arm_svc_uid = {
+	{0x5b, 0x90, 0x8d, 0x10},
+	{0x63, 0xf8},
+	{0xe8, 0x47},
+	0xae, 0x2d,
+	{0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2}
+};
+
+/* Setup Standard Services */
+static int32_t std_svc_setup(void)
+{
+	uintptr_t svc_arg;
+	int ret = 0;
+
+	svc_arg = get_arm_std_svc_args(PSCI_FID_MASK);
+	assert(svc_arg);
+
+	/*
+	 * PSCI is one of the specifications implemented as a Standard Service.
+	 * The `psci_setup()` also does EL3 architectural setup.
+	 */
+	if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) {
+		ret = 1;
+	}
+
+#if SPM_MM
+	if (spm_mm_setup() != 0) {
+		ret = 1;
+	}
+#endif
+
+#if defined(SPD_spmd)
+	if (spmd_setup() != 0) {
+		ret = 1;
+	}
+#endif
+
+#if ENABLE_RME
+	if (rmmd_setup() != 0) {
+		ret = 1;
+	}
+#endif
+
+#if SDEI_SUPPORT
+	/* SDEI initialisation */
+	sdei_init();
+#endif
+
+#if TRNG_SUPPORT
+	/* TRNG initialisation */
+	trng_setup();
+#endif /* TRNG_SUPPORT */
+
+#if DRTM_SUPPORT
+	if (drtm_setup() != 0) {
+		ret = 1;
+	}
+#endif /* DRTM_SUPPORT */
+
+	return ret;
+}
+
+/*
+ * Top-level Standard Service SMC handler. This handler will in turn dispatch
+ * calls to PSCI SMC handler
+ */
+static uintptr_t std_svc_smc_handler(uint32_t smc_fid,
+			     u_register_t x1,
+			     u_register_t x2,
+			     u_register_t x3,
+			     u_register_t x4,
+			     void *cookie,
+			     void *handle,
+			     u_register_t flags)
+{
+	if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) {
+		/* 32-bit SMC function, clear top parameter bits */
+
+		x1 &= UINT32_MAX;
+		x2 &= UINT32_MAX;
+		x3 &= UINT32_MAX;
+		x4 &= UINT32_MAX;
+	}
+
+	/*
+	 * Dispatch PSCI calls to PSCI SMC handler and return its return
+	 * value
+	 */
+	if (is_psci_fid(smc_fid)) {
+		uint64_t ret;
+
+#if ENABLE_RUNTIME_INSTRUMENTATION
+
+		/*
+		 * Flush cache line so that even if CPU power down happens
+		 * the timestamp update is reflected in memory.
+		 */
+		PMF_WRITE_TIMESTAMP(rt_instr_svc,
+		    RT_INSTR_ENTER_PSCI,
+		    PMF_CACHE_MAINT,
+		    get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX]));
+#endif
+
+		ret = psci_smc_handler(smc_fid, x1, x2, x3, x4,
+		    cookie, handle, flags);
+
+#if ENABLE_RUNTIME_INSTRUMENTATION
+		PMF_CAPTURE_TIMESTAMP(rt_instr_svc,
+		    RT_INSTR_EXIT_PSCI,
+		    PMF_NO_CACHE_MAINT);
+#endif
+
+		SMC_RET1(handle, ret);
+	}
+
+#if SPM_MM
+	/*
+	 * Dispatch SPM calls to SPM SMC handler and return its return
+	 * value
+	 */
+	if (is_spm_mm_fid(smc_fid)) {
+		return spm_mm_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+					  handle, flags);
+	}
+#endif
+
+#if defined(SPD_spmd)
+	/*
+	 * Dispatch FFA calls to the FFA SMC handler implemented by the SPM
+	 * dispatcher and return its return value
+	 */
+	if (is_ffa_fid(smc_fid)) {
+		return spmd_ffa_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+					    handle, flags);
+	}
+#endif
+
+#if SDEI_SUPPORT
+	if (is_sdei_fid(smc_fid)) {
+		return sdei_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
+				flags);
+	}
+#endif
+
+#if TRNG_SUPPORT
+	if (is_trng_fid(smc_fid)) {
+		return trng_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
+				flags);
+	}
+#endif /* TRNG_SUPPORT */
+
+#if ENABLE_RME
+
+	if (is_rmmd_el3_fid(smc_fid)) {
+		return rmmd_rmm_el3_handler(smc_fid, x1, x2, x3, x4, cookie,
+					    handle, flags);
+	}
+
+	if (is_rmi_fid(smc_fid)) {
+		return rmmd_rmi_handler(smc_fid, x1, x2, x3, x4, cookie,
+					handle, flags);
+	}
+#endif
+
+#if SMC_PCI_SUPPORT
+	if (is_pci_fid(smc_fid)) {
+		return pci_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
+				       flags);
+	}
+#endif
+
+#if DRTM_SUPPORT
+	if (is_drtm_fid(smc_fid)) {
+		return drtm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle,
+					flags);
+	}
+#endif /* DRTM_SUPPORT */
+
+	switch (smc_fid) {
+	case ARM_STD_SVC_CALL_COUNT:
+		/*
+		 * Return the number of Standard Service Calls. PSCI is the only
+		 * standard service implemented; so return number of PSCI calls
+		 */
+		SMC_RET1(handle, PSCI_NUM_CALLS);
+
+	case ARM_STD_SVC_UID:
+		/* Return UID to the caller */
+		SMC_UUID_RET(handle, arm_svc_uid);
+
+	case ARM_STD_SVC_VERSION:
+		/* Return the version of current implementation */
+		SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR);
+
+	default:
+		VERBOSE("Unimplemented Standard Service Call: 0x%x \n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/* Register Standard Service Calls as runtime service */
+DECLARE_RT_SVC(
+		std_svc,
+
+		OEN_STD_START,
+		OEN_STD_END,
+		SMC_TYPE_FAST,
+		std_svc_setup,
+		std_svc_smc_handler
+);
diff --git a/services/std_svc/trng/trng_entropy_pool.c b/services/std_svc/trng/trng_entropy_pool.c
new file mode 100644
index 0000000..30105b3
--- /dev/null
+++ b/services/std_svc/trng/trng_entropy_pool.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2021-2022, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <lib/spinlock.h>
+#include <plat/common/plat_trng.h>
+
+/*
+ * # Entropy pool
+ * Note that the TRNG Firmware interface can request up to 192 bits of entropy
+ * in a single call or three 64bit words per call. We have 4 words in the pool
+ * so that when we have 1-63 bits in the pool, and we have a request for
+ * 192 bits of entropy, we don't have to throw out the leftover 1-63 bits of
+ * entropy.
+ */
+#define WORDS_IN_POOL	(4)
+static uint64_t entropy[WORDS_IN_POOL];
+/* index in bits of the first bit of usable entropy */
+static uint32_t entropy_bit_index;
+/* then number of valid bits in the entropy pool */
+static uint32_t entropy_bit_size;
+
+static spinlock_t trng_pool_lock;
+
+#define BITS_PER_WORD		(sizeof(entropy[0]) * 8)
+#define BITS_IN_POOL		(WORDS_IN_POOL * BITS_PER_WORD)
+#define ENTROPY_MIN_WORD	(entropy_bit_index / BITS_PER_WORD)
+#define ENTROPY_FREE_BIT	(entropy_bit_size + entropy_bit_index)
+#define _ENTROPY_FREE_WORD	(ENTROPY_FREE_BIT / BITS_PER_WORD)
+#define ENTROPY_FREE_INDEX	(_ENTROPY_FREE_WORD % WORDS_IN_POOL)
+/* ENTROPY_WORD_INDEX(0) includes leftover bits in the lower bits */
+#define ENTROPY_WORD_INDEX(i)	((ENTROPY_MIN_WORD + i) % WORDS_IN_POOL)
+
+/*
+ * Fill the entropy pool until we have at least as many bits as requested.
+ * Returns true after filling the pool, and false if the entropy source is out
+ * of entropy and the pool could not be filled.
+ * Assumes locks are taken.
+ */
+static bool trng_fill_entropy(uint32_t nbits)
+{
+	while (nbits > entropy_bit_size) {
+		bool valid = plat_get_entropy(&entropy[ENTROPY_FREE_INDEX]);
+
+		if (valid) {
+			entropy_bit_size += BITS_PER_WORD;
+			assert(entropy_bit_size <= BITS_IN_POOL);
+		} else {
+			return false;
+		}
+	}
+	return true;
+}
+
+/*
+ * Pack entropy into the out buffer, filling and taking locks as needed.
+ * Returns true on success, false on failure.
+ *
+ * Note: out must have enough space for nbits of entropy
+ */
+bool trng_pack_entropy(uint32_t nbits, uint64_t *out)
+{
+	bool ret = true;
+
+	spin_lock(&trng_pool_lock);
+
+	if (!trng_fill_entropy(nbits)) {
+		ret = false;
+		goto out;
+	}
+
+	const unsigned int rshift = entropy_bit_index % BITS_PER_WORD;
+	const unsigned int lshift = BITS_PER_WORD - rshift;
+	const int to_fill = ((nbits + BITS_PER_WORD - 1) / BITS_PER_WORD);
+	int word_i;
+
+	for (word_i = 0; word_i < to_fill; word_i++) {
+		/*
+		 * Repack the entropy from the pool into the passed in out
+		 * buffer. This takes lesser bits from the valid upper bits
+		 * of word_i and more bits from the lower bits of (word_i + 1).
+		 *
+		 * I found the following diagram useful. note: `e` represents
+		 * valid entropy, ` ` represents invalid bits (not entropy) and
+		 * `x` represents valid entropy that must not end up in the
+		 * packed word.
+		 *
+		 *          |---------entropy pool----------|
+		 * C var    |--(word_i + 1)-|----word_i-----|
+		 * bit idx  |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
+		 *          [x,x,e,e,e,e,e,e|e,e, , , , , , ]
+		 *          |   [e,e,e,e,e,e,e,e]           |
+		 *          |   |--out[word_i]--|           |
+		 *    lshift|---|               |--rshift---|
+		 *
+		 *          ==== Which is implemented as ====
+		 *
+		 *          |---------entropy pool----------|
+		 * C var    |--(word_i + 1)-|----word_i-----|
+		 * bit idx  |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
+		 *          [x,x,e,e,e,e,e,e|e,e, , , , , , ]
+		 * C expr       << lshift       >> rshift
+		 * bit idx   5 4 3 2 1 0                 7 6
+		 *          [e,e,e,e,e,e,0,0|0,0,0,0,0,0,e,e]
+		 *                ==== bit-wise or ====
+		 *                   5 4 3 2 1 0 7 6
+		 *                  [e,e,e,e,e,e,e,e]
+		 */
+		out[word_i] = 0;
+		out[word_i] |= entropy[ENTROPY_WORD_INDEX(word_i)] >> rshift;
+
+		/*
+		 * Note that a shift of 64 bits is treated as a shift of 0 bits.
+		 * When the shift amount is the same as the BITS_PER_WORD, we
+		 * don't want to include the next word of entropy, so we skip
+		 * the `|=` operation.
+		 */
+		if (lshift != BITS_PER_WORD) {
+			out[word_i] |= entropy[ENTROPY_WORD_INDEX(word_i + 1)]
+				<< lshift;
+		}
+	}
+	const uint64_t mask = ~0ULL >> (BITS_PER_WORD - (nbits % BITS_PER_WORD));
+
+	out[to_fill - 1] &= mask;
+
+	entropy_bit_index = (entropy_bit_index + nbits) % BITS_IN_POOL;
+	entropy_bit_size -= nbits;
+
+out:
+	spin_unlock(&trng_pool_lock);
+
+	return ret;
+}
+
+void trng_entropy_pool_setup(void)
+{
+	int i;
+
+	for (i = 0; i < WORDS_IN_POOL; i++) {
+		entropy[i] = 0;
+	}
+	entropy_bit_index = 0;
+	entropy_bit_size = 0;
+}
diff --git a/services/std_svc/trng/trng_entropy_pool.h b/services/std_svc/trng/trng_entropy_pool.h
new file mode 100644
index 0000000..fab2367
--- /dev/null
+++ b/services/std_svc/trng/trng_entropy_pool.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef TRNG_ENTROPY_POOL_H
+#define TRNG_ENTROPY_POOL_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+bool trng_pack_entropy(uint32_t nbits, uint64_t *out);
+void trng_entropy_pool_setup(void);
+
+#endif /* TRNG_ENTROPY_POOL_H */
diff --git a/services/std_svc/trng/trng_main.c b/services/std_svc/trng/trng_main.c
new file mode 100644
index 0000000..90098a8
--- /dev/null
+++ b/services/std_svc/trng/trng_main.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <arch_features.h>
+#include <lib/smccc.h>
+#include <services/trng_svc.h>
+#include <smccc_helpers.h>
+
+#include <plat/common/plat_trng.h>
+
+#include "trng_entropy_pool.h"
+
+static const uuid_t uuid_null;
+
+/* handle the RND call in SMC 32 bit mode */
+static uintptr_t trng_rnd32(uint32_t nbits, void *handle)
+{
+	uint32_t mask = ~0U;
+	uint64_t ent[2] = {0};
+
+	if (nbits == 0U || nbits > TRNG_RND32_ENTROPY_MAXBITS) {
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+	}
+
+	if (!trng_pack_entropy(nbits, &ent[0])) {
+		SMC_RET1(handle, TRNG_E_NO_ENTROPY);
+	}
+
+	if ((nbits % 32U) != 0U) {
+		mask >>= 32U - (nbits % 32U);
+	}
+
+	switch ((nbits - 1U) / 32U) {
+	case 0:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, 0, ent[0] & mask);
+		break; /* unreachable */
+	case 1:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, (ent[0] >> 32) & mask,
+			 ent[0] & 0xFFFFFFFF);
+		break; /* unreachable */
+	case 2:
+		SMC_RET4(handle, TRNG_E_SUCCESS, ent[1] & mask,
+			 (ent[0] >> 32) & 0xFFFFFFFF, ent[0] & 0xFFFFFFFF);
+		break; /* unreachable */
+	default:
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+		break; /* unreachable */
+	}
+}
+
+/* handle the RND call in SMC 64 bit mode */
+static uintptr_t trng_rnd64(uint32_t nbits, void *handle)
+{
+	uint64_t mask = ~0ULL;
+	uint64_t ent[3] = {0};
+
+	if (nbits == 0U || nbits > TRNG_RND64_ENTROPY_MAXBITS) {
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+	}
+
+	if (!trng_pack_entropy(nbits, &ent[0])) {
+		SMC_RET1(handle, TRNG_E_NO_ENTROPY);
+	}
+
+	/* Mask off higher bits if only part of register requested */
+	if ((nbits % 64U) != 0U) {
+		mask >>= 64U - (nbits % 64U);
+	}
+
+	switch ((nbits - 1U) / 64U) {
+	case 0:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, 0, ent[0] & mask);
+		break; /* unreachable */
+	case 1:
+		SMC_RET4(handle, TRNG_E_SUCCESS, 0, ent[1] & mask, ent[0]);
+		break; /* unreachable */
+	case 2:
+		SMC_RET4(handle, TRNG_E_SUCCESS, ent[2] & mask, ent[1], ent[0]);
+		break; /* unreachable */
+	default:
+		SMC_RET1(handle, TRNG_E_INVALID_PARAMS);
+		break; /* unreachable */
+	}
+}
+
+void trng_setup(void)
+{
+	trng_entropy_pool_setup();
+	plat_entropy_setup();
+}
+
+/* Predicate indicating that a function id is part of TRNG */
+bool is_trng_fid(uint32_t smc_fid)
+{
+	return ((smc_fid == ARM_TRNG_VERSION) ||
+		(smc_fid == ARM_TRNG_FEATURES) ||
+		(smc_fid == ARM_TRNG_GET_UUID) ||
+		(smc_fid == ARM_TRNG_RND32) ||
+		(smc_fid == ARM_TRNG_RND64));
+}
+
+uintptr_t trng_smc_handler(uint32_t smc_fid, u_register_t x1, u_register_t x2,
+			   u_register_t x3, u_register_t x4, void *cookie,
+			   void *handle, u_register_t flags)
+{
+	if (!memcmp(&plat_trng_uuid, &uuid_null, sizeof(uuid_t))) {
+		SMC_RET1(handle, TRNG_E_NOT_IMPLEMENTED);
+	}
+
+	switch (smc_fid) {
+	case ARM_TRNG_VERSION:
+		SMC_RET1(handle, MAKE_SMCCC_VERSION(
+			TRNG_VERSION_MAJOR, TRNG_VERSION_MINOR));
+		break; /* unreachable */
+
+	case ARM_TRNG_FEATURES:
+		if (is_trng_fid((uint32_t)x1)) {
+			SMC_RET1(handle, TRNG_E_SUCCESS);
+		} else {
+			SMC_RET1(handle, TRNG_E_NOT_SUPPORTED);
+		}
+		break; /* unreachable */
+
+	case ARM_TRNG_GET_UUID:
+		SMC_UUID_RET(handle, plat_trng_uuid);
+		break; /* unreachable */
+
+	case ARM_TRNG_RND32:
+		return trng_rnd32((uint32_t)x1, handle);
+
+	case ARM_TRNG_RND64:
+		return trng_rnd64((uint32_t)x1, handle);
+
+	default:
+		WARN("Unimplemented TRNG Service Call: 0x%x\n", smc_fid);
+		SMC_RET1(handle, TRNG_E_NOT_IMPLEMENTED);
+		break; /* unreachable */
+	}
+}