1 /* 2 * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch_helpers.h> 8 #include <assert.h> 9 #include <bl_common.h> 10 #include <context_mgmt.h> 11 #include <string.h> 12 #include <utils.h> 13 #include "opteed_private.h" 14 15 /******************************************************************************* 16 * Given a OPTEE entrypoint info pointer, entry point PC, register width, 17 * cpu id & pointer to a context data structure, this function will 18 * initialize OPTEE context and entry point info for OPTEE. 19 ******************************************************************************/ 20 void opteed_init_optee_ep_state(struct entry_point_info *optee_entry_point, 21 uint32_t rw, uint64_t pc, 22 optee_context_t *optee_ctx) 23 { 24 uint32_t ep_attr; 25 26 /* Passing a NULL context is a critical programming error */ 27 assert(optee_ctx); 28 assert(optee_entry_point); 29 assert(pc); 30 31 /* Associate this context with the cpu specified */ 32 optee_ctx->mpidr = read_mpidr_el1(); 33 optee_ctx->state = 0; 34 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF); 35 36 cm_set_context(&optee_ctx->cpu_ctx, SECURE); 37 38 /* initialise an entrypoint to set up the CPU context */ 39 ep_attr = SECURE | EP_ST_ENABLE; 40 if (read_sctlr_el3() & SCTLR_EE_BIT) 41 ep_attr |= EP_EE_BIG; 42 SET_PARAM_HEAD(optee_entry_point, PARAM_EP, VERSION_1, ep_attr); 43 optee_entry_point->pc = pc; 44 if (rw == OPTEE_AARCH64) 45 optee_entry_point->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 46 DISABLE_ALL_EXCEPTIONS); 47 else 48 optee_entry_point->spsr = SPSR_MODE32(MODE32_svc, SPSR_T_ARM, 49 SPSR_E_LITTLE, 50 DAIF_FIQ_BIT | 51 DAIF_IRQ_BIT | 52 DAIF_ABT_BIT); 53 zeromem(&optee_entry_point->args, sizeof(optee_entry_point->args)); 54 } 55 56 /******************************************************************************* 57 * This function takes an OPTEE context pointer and: 58 * 1. Applies the S-EL1 system register context from optee_ctx->cpu_ctx. 59 * 2. Saves the current C runtime state (callee saved registers) on the stack 60 * frame and saves a reference to this state. 61 * 3. Calls el3_exit() so that the EL3 system and general purpose registers 62 * from the optee_ctx->cpu_ctx are used to enter the OPTEE image. 63 ******************************************************************************/ 64 uint64_t opteed_synchronous_sp_entry(optee_context_t *optee_ctx) 65 { 66 uint64_t rc; 67 68 assert(optee_ctx != NULL); 69 assert(optee_ctx->c_rt_ctx == 0); 70 71 /* Apply the Secure EL1 system register context and switch to it */ 72 assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx); 73 cm_el1_sysregs_context_restore(SECURE); 74 cm_set_next_eret_context(SECURE); 75 76 rc = opteed_enter_sp(&optee_ctx->c_rt_ctx); 77 #if DEBUG 78 optee_ctx->c_rt_ctx = 0; 79 #endif 80 81 return rc; 82 } 83 84 85 /******************************************************************************* 86 * This function takes an OPTEE context pointer and: 87 * 1. Saves the S-EL1 system register context tp optee_ctx->cpu_ctx. 88 * 2. Restores the current C runtime state (callee saved registers) from the 89 * stack frame using the reference to this state saved in opteed_enter_sp(). 90 * 3. It does not need to save any general purpose or EL3 system register state 91 * as the generic smc entry routine should have saved those. 92 ******************************************************************************/ 93 void opteed_synchronous_sp_exit(optee_context_t *optee_ctx, uint64_t ret) 94 { 95 assert(optee_ctx != NULL); 96 /* Save the Secure EL1 system register context */ 97 assert(cm_get_context(SECURE) == &optee_ctx->cpu_ctx); 98 cm_el1_sysregs_context_save(SECURE); 99 100 assert(optee_ctx->c_rt_ctx != 0); 101 opteed_exit_sp(optee_ctx->c_rt_ctx, ret); 102 103 /* Should never reach here */ 104 assert(0); 105 } 106