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112 lines
3.9 KiB
112 lines
3.9 KiB
/*
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* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <string.h>
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#include <arch_helpers.h>
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#include <common/bl_common.h>
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#include <lib/el3_runtime/context_mgmt.h>
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#include <lib/utils.h>
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#include "opteed_private.h"
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/*******************************************************************************
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* Given a OPTEE entrypoint info pointer, entry point PC, register width,
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* cpu id & pointer to a context data structure, this function will
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* initialize OPTEE context and entry point info for OPTEE.
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******************************************************************************/
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void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point,
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uint32_t rw, uint64_t pc,
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uint64_t pageable_part, uint64_t mem_limit,
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uint64_t dt_addr, optee_context_t *optee_ctx)
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{
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uint32_t ep_attr;
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/* Passing a NULL context is a critical programming error */
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assert(optee_ctx);
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assert(optee_entry_point);
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assert(pc);
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/* Associate this context with the cpu specified */
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optee_ctx->mpidr = read_mpidr_el1();
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optee_ctx->state = 0;
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set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF);
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cm_set_context(&optee_ctx->cpu_ctx, SECURE);
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/* initialise an entrypoint to set up the CPU context */
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ep_attr = SECURE | EP_ST_ENABLE;
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if (read_sctlr_el3() & SCTLR_EE_BIT)
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ep_attr |= EP_EE_BIG;
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SET_PARAM_HEAD(optee_entry_point, PARAM_EP, VERSION_1, ep_attr);
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optee_entry_point->pc = pc;
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if (rw == OPTEE_AARCH64)
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optee_entry_point->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
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DISABLE_ALL_EXCEPTIONS);
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else
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optee_entry_point->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM,
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SPSR_E_LITTLE,
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DAIF_FIQ_BIT |
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DAIF_IRQ_BIT |
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DAIF_ABT_BIT);
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zeromem(&optee_entry_point->args, sizeof(optee_entry_point->args));
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optee_entry_point->args.arg0 = pageable_part;
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optee_entry_point->args.arg1 = mem_limit;
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optee_entry_point->args.arg2 = dt_addr;
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}
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/*******************************************************************************
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* This function takes an OPTEE context pointer and:
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* 1. Applies the S-EL1 system register context from optee_ctx->cpu_ctx.
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* 2. Saves the current C runtime state (callee saved registers) on the stack
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* frame and saves a reference to this state.
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* 3. Calls el3_exit() so that the EL3 system and general purpose registers
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* from the optee_ctx->cpu_ctx are used to enter the OPTEE image.
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******************************************************************************/
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uint64_t opteed_synchronous_sp_entry(optee_context_t *optee_ctx)
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{
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uint64_t rc;
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assert(optee_ctx != NULL);
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assert(optee_ctx->c_rt_ctx == 0);
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/* Apply the Secure EL1 system register context and switch to it */
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assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx);
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cm_el1_sysregs_context_restore(SECURE);
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cm_set_next_eret_context(SECURE);
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rc = opteed_enter_sp(&optee_ctx->c_rt_ctx);
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#if ENABLE_ASSERTIONS
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optee_ctx->c_rt_ctx = 0;
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#endif
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return rc;
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}
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/*******************************************************************************
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* This function takes an OPTEE context pointer and:
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* 1. Saves the S-EL1 system register context tp optee_ctx->cpu_ctx.
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* 2. Restores the current C runtime state (callee saved registers) from the
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* stack frame using the reference to this state saved in opteed_enter_sp().
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* 3. It does not need to save any general purpose or EL3 system register state
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* as the generic smc entry routine should have saved those.
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******************************************************************************/
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void opteed_synchronous_sp_exit(optee_context_t *optee_ctx, uint64_t ret)
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{
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assert(optee_ctx != NULL);
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/* Save the Secure EL1 system register context */
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assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx);
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cm_el1_sysregs_context_save(SECURE);
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assert(optee_ctx->c_rt_ctx != 0);
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opteed_exit_sp(optee_ctx->c_rt_ctx, ret);
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/* Should never reach here */
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assert(0);
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}
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