1 /* 2 * Copyright (c) 2013-2023, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <string.h> 9 10 #include <arch_helpers.h> 11 #include <common/bl_common.h> 12 #include <lib/el3_runtime/context_mgmt.h> 13 #include <lib/utils.h> 14 15 #include "opteed_private.h" 16 17 /******************************************************************************* 18 * Given a OPTEE entrypoint info pointer, entry point PC, register width, 19 * cpu id & pointer to a context data structure, this function will 20 * initialize OPTEE context and entry point info for OPTEE. 21 ******************************************************************************/ 22 void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point, 23 uint32_t rw, uint64_t pc, uint64_t arg0, 24 uint64_t arg1, uint64_t arg2, uint64_t arg3, 25 optee_context_t *optee_ctx) 26 { 27 uint32_t ep_attr; 28 29 /* Passing a NULL context is a critical programming error */ 30 assert(optee_ctx); 31 assert(optee_entry_point); 32 assert(pc); 33 34 /* Associate this context with the cpu specified */ 35 optee_ctx->mpidr = read_mpidr_el1(); 36 optee_ctx->state = 0; 37 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF); 38 39 cm_set_context(&optee_ctx->cpu_ctx, SECURE); 40 41 /* initialise an entrypoint to set up the CPU context */ 42 ep_attr = SECURE | EP_ST_ENABLE; 43 if (read_sctlr_el3() & SCTLR_EE_BIT) 44 ep_attr |= EP_EE_BIG; 45 SET_PARAM_HEAD(optee_entry_point, PARAM_EP, VERSION_1, ep_attr); 46 optee_entry_point->pc = pc; 47 if (rw == OPTEE_AARCH64) 48 optee_entry_point->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 49 DISABLE_ALL_EXCEPTIONS); 50 else 51 optee_entry_point->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM, 52 SPSR_E_LITTLE, 53 DAIF_FIQ_BIT | 54 DAIF_IRQ_BIT | 55 DAIF_ABT_BIT); 56 zeromem(&optee_entry_point->args, sizeof(optee_entry_point->args)); 57 optee_entry_point->args.arg0 = arg0; 58 optee_entry_point->args.arg1 = arg1; 59 optee_entry_point->args.arg2 = arg2; 60 optee_entry_point->args.arg3 = arg3; 61 } 62 63 /******************************************************************************* 64 * This function takes an OPTEE context pointer and: 65 * 1. Applies the S-EL1 system register context from optee_ctx->cpu_ctx. 66 * 2. Saves the current C runtime state (callee saved registers) on the stack 67 * frame and saves a reference to this state. 68 * 3. Calls el3_exit() so that the EL3 system and general purpose registers 69 * from the optee_ctx->cpu_ctx are used to enter the OPTEE image. 70 ******************************************************************************/ 71 uint64_t opteed_synchronous_sp_entry(optee_context_t *optee_ctx) 72 { 73 uint64_t rc; 74 75 assert(optee_ctx != NULL); 76 assert(optee_ctx->c_rt_ctx == 0); 77 78 /* Apply the Secure EL1 system register context and switch to it */ 79 assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx); 80 cm_el1_sysregs_context_restore(SECURE); 81 cm_set_next_eret_context(SECURE); 82 83 rc = opteed_enter_sp(&optee_ctx->c_rt_ctx); 84 #if ENABLE_ASSERTIONS 85 optee_ctx->c_rt_ctx = 0; 86 #endif 87 88 return rc; 89 } 90 91 92 /******************************************************************************* 93 * This function takes an OPTEE context pointer and: 94 * 1. Saves the S-EL1 system register context tp optee_ctx->cpu_ctx. 95 * 2. Restores the current C runtime state (callee saved registers) from the 96 * stack frame using the reference to this state saved in opteed_enter_sp(). 97 * 3. It does not need to save any general purpose or EL3 system register state 98 * as the generic smc entry routine should have saved those. 99 ******************************************************************************/ 100 void opteed_synchronous_sp_exit(optee_context_t *optee_ctx, uint64_t ret) 101 { 102 assert(optee_ctx != NULL); 103 /* Save the Secure EL1 system register context */ 104 assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx); 105 cm_el1_sysregs_context_save(SECURE); 106 107 assert(optee_ctx->c_rt_ctx != 0); 108 opteed_exit_sp(optee_ctx->c_rt_ctx, ret); 109 110 /* Should never reach here */ 111 assert(0); 112 } 113