GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/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);
+}