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-rw-r--r--bl1/aarch32/bl1_arch_setup.c15
-rw-r--r--bl1/aarch32/bl1_context_mgmt.c172
-rw-r--r--bl1/aarch32/bl1_entrypoint.S99
-rw-r--r--bl1/aarch32/bl1_exceptions.S165
4 files changed, 451 insertions, 0 deletions
diff --git a/bl1/aarch32/bl1_arch_setup.c b/bl1/aarch32/bl1_arch_setup.c
new file mode 100644
index 0000000..ce04aaa
--- /dev/null
+++ b/bl1/aarch32/bl1_arch_setup.c
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "../bl1_private.h"
+
+/*******************************************************************************
+ * TODO: Function that does the first bit of architectural setup.
+ ******************************************************************************/
+void bl1_arch_setup(void)
+{
+
+}
diff --git a/bl1/aarch32/bl1_context_mgmt.c b/bl1/aarch32/bl1_context_mgmt.c
new file mode 100644
index 0000000..85d35a7
--- /dev/null
+++ b/bl1/aarch32/bl1_context_mgmt.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <context.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+#include <smccc_helpers.h>
+
+#include "../bl1_private.h"
+
+/*
+ * Following arrays will be used for context management.
+ * There are 2 instances, for the Secure and Non-Secure contexts.
+ */
+static cpu_context_t bl1_cpu_context[2];
+static smc_ctx_t bl1_smc_context[2];
+
+/* Following contains the next cpu context pointer. */
+static void *bl1_next_cpu_context_ptr;
+
+/* Following contains the next smc context pointer. */
+static void *bl1_next_smc_context_ptr;
+
+/* Following functions are used for SMC context handling */
+void *smc_get_ctx(unsigned int security_state)
+{
+ assert(sec_state_is_valid(security_state));
+ return &bl1_smc_context[security_state];
+}
+
+void smc_set_next_ctx(unsigned int security_state)
+{
+ assert(sec_state_is_valid(security_state));
+ bl1_next_smc_context_ptr = &bl1_smc_context[security_state];
+}
+
+void *smc_get_next_ctx(void)
+{
+ return bl1_next_smc_context_ptr;
+}
+
+/* Following functions are used for CPU context handling */
+void *cm_get_context(uint32_t security_state)
+{
+ assert(sec_state_is_valid(security_state));
+ return &bl1_cpu_context[security_state];
+}
+
+void cm_set_next_context(void *context)
+{
+ assert(context != NULL);
+ bl1_next_cpu_context_ptr = context;
+}
+
+void *cm_get_next_context(void)
+{
+ return bl1_next_cpu_context_ptr;
+}
+
+/*******************************************************************************
+ * Following function copies GP regs r0-r4, lr and spsr,
+ * from the CPU context to the SMC context structures.
+ ******************************************************************************/
+static void copy_cpu_ctx_to_smc_ctx(const regs_t *cpu_reg_ctx,
+ smc_ctx_t *next_smc_ctx)
+{
+ next_smc_ctx->r0 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R0);
+ next_smc_ctx->r1 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R1);
+ next_smc_ctx->r2 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R2);
+ next_smc_ctx->r3 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R3);
+ next_smc_ctx->lr_mon = read_ctx_reg(cpu_reg_ctx, CTX_LR);
+ next_smc_ctx->spsr_mon = read_ctx_reg(cpu_reg_ctx, CTX_SPSR);
+ next_smc_ctx->scr = read_ctx_reg(cpu_reg_ctx, CTX_SCR);
+}
+
+/*******************************************************************************
+ * Following function flushes the SMC & CPU context pointer and its data.
+ ******************************************************************************/
+static void flush_smc_and_cpu_ctx(void)
+{
+ flush_dcache_range((uintptr_t)&bl1_next_smc_context_ptr,
+ sizeof(bl1_next_smc_context_ptr));
+ flush_dcache_range((uintptr_t)bl1_next_smc_context_ptr,
+ sizeof(smc_ctx_t));
+
+ flush_dcache_range((uintptr_t)&bl1_next_cpu_context_ptr,
+ sizeof(bl1_next_cpu_context_ptr));
+ flush_dcache_range((uintptr_t)bl1_next_cpu_context_ptr,
+ sizeof(cpu_context_t));
+}
+
+/*******************************************************************************
+ * This function prepares the context for Secure/Normal world images.
+ * Normal world images are transitioned to HYP(if supported) else SVC.
+ ******************************************************************************/
+void bl1_prepare_next_image(unsigned int image_id)
+{
+ unsigned int security_state, mode = MODE32_svc;
+ image_desc_t *desc;
+ entry_point_info_t *next_bl_ep;
+
+ /* Get the image descriptor. */
+ desc = bl1_plat_get_image_desc(image_id);
+ assert(desc != NULL);
+
+ /* Get the entry point info. */
+ next_bl_ep = &desc->ep_info;
+
+ /* Get the image security state. */
+ security_state = GET_SECURITY_STATE(next_bl_ep->h.attr);
+
+ /* Prepare the SPSR for the next BL image. */
+ if ((security_state != SECURE) && (GET_VIRT_EXT(read_id_pfr1()) != 0U)) {
+ mode = MODE32_hyp;
+ }
+
+ next_bl_ep->spsr = SPSR_MODE32(mode, SPSR_T_ARM,
+ SPSR_E_LITTLE, DISABLE_ALL_EXCEPTIONS);
+
+ /* Allow platform to make change */
+ bl1_plat_set_ep_info(image_id, next_bl_ep);
+
+ /* Prepare the cpu context for the next BL image. */
+ cm_init_my_context(next_bl_ep);
+ cm_prepare_el3_exit(security_state);
+ cm_set_next_context(cm_get_context(security_state));
+
+ /* Prepare the smc context for the next BL image. */
+ smc_set_next_ctx(security_state);
+ copy_cpu_ctx_to_smc_ctx(get_regs_ctx(cm_get_next_context()),
+ smc_get_next_ctx());
+
+ /*
+ * If the next image is non-secure, then we need to program the banked
+ * non secure sctlr. This is not required when the next image is secure
+ * because in AArch32, we expect the secure world to have the same
+ * SCTLR settings.
+ */
+ if (security_state == NON_SECURE) {
+ cpu_context_t *ctx = cm_get_context(security_state);
+ u_register_t ns_sctlr;
+
+ /* Temporarily set the NS bit to access NS SCTLR */
+ write_scr(read_scr() | SCR_NS_BIT);
+ isb();
+
+ ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR);
+ write_sctlr(ns_sctlr);
+ isb();
+
+ write_scr(read_scr() & ~SCR_NS_BIT);
+ isb();
+ }
+
+ /*
+ * Flush the SMC & CPU context and the (next)pointers,
+ * to access them after caches are disabled.
+ */
+ flush_smc_and_cpu_ctx();
+
+ /* Indicate that image is in execution state. */
+ desc->state = IMAGE_STATE_EXECUTED;
+
+ print_entry_point_info(next_bl_ep);
+}
diff --git a/bl1/aarch32/bl1_entrypoint.S b/bl1/aarch32/bl1_entrypoint.S
new file mode 100644
index 0000000..b22015e
--- /dev/null
+++ b/bl1/aarch32/bl1_entrypoint.S
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2016-2022, 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>
+#include <el3_common_macros.S>
+#include <smccc_helpers.h>
+#include <smccc_macros.S>
+
+ .globl bl1_vector_table
+ .globl bl1_entrypoint
+
+ /* -----------------------------------------------------
+ * Setup the vector table to support SVC & MON mode.
+ * -----------------------------------------------------
+ */
+vector_base bl1_vector_table
+ b bl1_entrypoint
+ b report_exception /* Undef */
+ b bl1_aarch32_smc_handler /* SMC call */
+ b report_prefetch_abort /* Prefetch abort */
+ b report_data_abort /* Data abort */
+ b report_exception /* Reserved */
+ b report_exception /* IRQ */
+ b report_exception /* FIQ */
+
+ /* -----------------------------------------------------
+ * bl1_entrypoint() is the entry point into the trusted
+ * firmware code when a cpu is released from warm or
+ * cold reset.
+ * -----------------------------------------------------
+ */
+
+func bl1_entrypoint
+/* ---------------------------------------------------------------------
+* If the reset address is programmable then bl1_entrypoint() is
+* executed only on the cold boot path. Therefore, we can skip the warm
+* boot mailbox mechanism.
+* ---------------------------------------------------------------------
+*/
+ el3_entrypoint_common \
+ _init_sctlr=1 \
+ _warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS \
+ _secondary_cold_boot=!COLD_BOOT_SINGLE_CPU \
+ _init_memory=1 \
+ _init_c_runtime=1 \
+ _exception_vectors=bl1_vector_table \
+ _pie_fixup_size=0
+
+ /* -----------------------------------------------------
+ * Perform BL1 setup
+ * -----------------------------------------------------
+ */
+ bl bl1_setup
+
+ /* -----------------------------------------------------
+ * Jump to main function.
+ * -----------------------------------------------------
+ */
+ bl bl1_main
+
+ /* -----------------------------------------------------
+ * Jump to next image.
+ * -----------------------------------------------------
+ */
+
+ /*
+ * Get the smc_context for next BL image,
+ * program the gp/system registers and save it in `r4`.
+ */
+ bl smc_get_next_ctx
+ mov r4, r0
+
+ /* Only turn-off MMU if going to secure world */
+ ldr r5, [r4, #SMC_CTX_SCR]
+ tst r5, #SCR_NS_BIT
+ bne skip_mmu_off
+
+ /*
+ * MMU needs to be disabled because both BL1 and BL2/BL2U execute
+ * in PL1, and therefore share the same address space.
+ * BL2/BL2U will initialize the address space according to its
+ * own requirement.
+ */
+ bl disable_mmu_icache_secure
+ stcopr r0, TLBIALL
+ dsb sy
+ isb
+
+skip_mmu_off:
+ /* Restore smc_context from `r4` and exit secure monitor mode. */
+ mov r0, r4
+ monitor_exit
+endfunc bl1_entrypoint
diff --git a/bl1/aarch32/bl1_exceptions.S b/bl1/aarch32/bl1_exceptions.S
new file mode 100644
index 0000000..4a6815f
--- /dev/null
+++ b/bl1/aarch32/bl1_exceptions.S
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2016-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl1/bl1.h>
+#include <common/bl_common.h>
+#include <context.h>
+#include <lib/xlat_tables/xlat_tables.h>
+#include <smccc_helpers.h>
+#include <smccc_macros.S>
+
+ .globl bl1_aarch32_smc_handler
+
+
+func bl1_aarch32_smc_handler
+ /* On SMC entry, `sp` points to `smc_ctx_t`. Save `lr`. */
+ str lr, [sp, #SMC_CTX_LR_MON]
+
+ /* ------------------------------------------------
+ * SMC in BL1 is handled assuming that the MMU is
+ * turned off by BL2.
+ * ------------------------------------------------
+ */
+
+ /* ----------------------------------------------
+ * Detect if this is a RUN_IMAGE or other SMC.
+ * ----------------------------------------------
+ */
+ mov lr, #BL1_SMC_RUN_IMAGE
+ cmp lr, r0
+ bne smc_handler
+
+ /* ------------------------------------------------
+ * Make sure only Secure world reaches here.
+ * ------------------------------------------------
+ */
+ ldcopr r8, SCR
+ tst r8, #SCR_NS_BIT
+ blne report_exception
+
+ /* ---------------------------------------------------------------------
+ * Pass control to next secure image.
+ * Here it expects r1 to contain the address of a entry_point_info_t
+ * structure describing the BL entrypoint.
+ * ---------------------------------------------------------------------
+ */
+ mov r8, r1
+ mov r0, r1
+ bl bl1_print_next_bl_ep_info
+
+#if SPIN_ON_BL1_EXIT
+ bl print_debug_loop_message
+debug_loop:
+ b debug_loop
+#endif
+
+ mov r0, r8
+ bl bl1_plat_prepare_exit
+
+ stcopr r0, TLBIALL
+ dsb sy
+ isb
+
+ /*
+ * Extract PC and SPSR based on struct `entry_point_info_t`
+ * and load it in LR and SPSR registers respectively.
+ */
+ ldr lr, [r8, #ENTRY_POINT_INFO_PC_OFFSET]
+ ldr r1, [r8, #(ENTRY_POINT_INFO_PC_OFFSET + 4)]
+ msr spsr_xc, r1
+
+ /* Some BL32 stages expect lr_svc to provide the BL33 entry address */
+ cps #MODE32_svc
+ ldr lr, [r8, #ENTRY_POINT_INFO_LR_SVC_OFFSET]
+ cps #MODE32_mon
+
+ add r8, r8, #ENTRY_POINT_INFO_ARGS_OFFSET
+ ldm r8, {r0, r1, r2, r3}
+ exception_return
+endfunc bl1_aarch32_smc_handler
+
+ /* -----------------------------------------------------
+ * Save Secure/Normal world context and jump to
+ * BL1 SMC handler.
+ * -----------------------------------------------------
+ */
+func smc_handler
+ /* -----------------------------------------------------
+ * Save the GP registers.
+ * -----------------------------------------------------
+ */
+ smccc_save_gp_mode_regs
+
+ /*
+ * `sp` still points to `smc_ctx_t`. Save it to a register
+ * and restore the C runtime stack pointer to `sp`.
+ */
+ mov r6, sp
+ ldr sp, [r6, #SMC_CTX_SP_MON]
+
+ ldr r0, [r6, #SMC_CTX_SCR]
+ and r7, r0, #SCR_NS_BIT /* flags */
+
+ /* Switch to Secure Mode */
+ bic r0, #SCR_NS_BIT
+ stcopr r0, SCR
+ isb
+
+ /* If caller is from Secure world then turn on the MMU */
+ tst r7, #SCR_NS_BIT
+ bne skip_mmu_on
+
+ /* Turn on the MMU */
+ mov r0, #DISABLE_DCACHE
+ bl enable_mmu_svc_mon
+
+ /*
+ * Invalidate `smc_ctx_t` in data cache to prevent dirty data being
+ * used.
+ */
+ mov r0, r6
+ mov r1, #SMC_CTX_SIZE
+ bl inv_dcache_range
+
+ /* Enable the data cache. */
+ ldcopr r9, SCTLR
+ orr r9, r9, #SCTLR_C_BIT
+ stcopr r9, SCTLR
+ isb
+
+skip_mmu_on:
+ /* Prepare arguments for BL1 SMC wrapper. */
+ ldr r0, [r6, #SMC_CTX_GPREG_R0] /* smc_fid */
+ mov r1, #0 /* cookie */
+ mov r2, r6 /* handle */
+ mov r3, r7 /* flags */
+ bl bl1_smc_wrapper
+
+ /* Get the smc_context for next BL image */
+ bl smc_get_next_ctx
+ mov r4, r0
+
+ /* Only turn-off MMU if going to secure world */
+ ldr r5, [r4, #SMC_CTX_SCR]
+ tst r5, #SCR_NS_BIT
+ bne skip_mmu_off
+
+ /* Disable the MMU */
+ bl disable_mmu_icache_secure
+ stcopr r0, TLBIALL
+ dsb sy
+ isb
+
+skip_mmu_off:
+ /* -----------------------------------------------------
+ * Do the transition to next BL image.
+ * -----------------------------------------------------
+ */
+ mov r0, r4
+ monitor_exit
+endfunc smc_handler
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