summaryrefslogtreecommitdiffstats
path: root/services/spd/opteed/opteed_common.c
diff options
context:
space:
mode:
Diffstat (limited to 'services/spd/opteed/opteed_common.c')
-rw-r--r--services/spd/opteed/opteed_common.c111
1 files changed, 111 insertions, 0 deletions
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);
+}