1 /* 2 * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <arch_helpers.h> 10 #include <context.h> 11 #include <common/debug.h> 12 #include <lib/el3_runtime/context_mgmt.h> 13 #include <plat/common/platform.h> 14 15 #include "../bl1_private.h" 16 17 /* Following contains the cpu context pointers. */ 18 static void *bl1_cpu_context_ptr[2]; 19 20 cm_get_context(uint32_t security_state)21void *cm_get_context(uint32_t security_state) 22 { 23 assert(sec_state_is_valid(security_state)); 24 return bl1_cpu_context_ptr[security_state]; 25 } 26 cm_set_context(void * context,uint32_t security_state)27void cm_set_context(void *context, uint32_t security_state) 28 { 29 assert(sec_state_is_valid(security_state)); 30 bl1_cpu_context_ptr[security_state] = context; 31 } 32 33 /******************************************************************************* 34 * This function prepares the context for Secure/Normal world images. 35 * Normal world images are transitioned to EL2(if supported) else EL1. 36 ******************************************************************************/ bl1_prepare_next_image(unsigned int image_id)37void bl1_prepare_next_image(unsigned int image_id) 38 { 39 40 /* 41 * Following array will be used for context management. 42 * There are 2 instances, for the Secure and Non-Secure contexts. 43 */ 44 static cpu_context_t bl1_cpu_context[2]; 45 46 unsigned int security_state, mode = MODE_EL1; 47 image_desc_t *desc; 48 entry_point_info_t *next_bl_ep; 49 50 #if CTX_INCLUDE_AARCH32_REGS 51 /* 52 * Ensure that the build flag to save AArch32 system registers in CPU 53 * context is not set for AArch64-only platforms. 54 */ 55 if (el_implemented(1) == EL_IMPL_A64ONLY) { 56 ERROR("EL1 supports AArch64-only. Please set build flag " 57 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 58 panic(); 59 } 60 #endif 61 62 /* Get the image descriptor. */ 63 desc = bl1_plat_get_image_desc(image_id); 64 assert(desc != NULL); 65 66 /* Get the entry point info. */ 67 next_bl_ep = &desc->ep_info; 68 69 /* Get the image security state. */ 70 security_state = GET_SECURITY_STATE(next_bl_ep->h.attr); 71 72 /* Setup the Secure/Non-Secure context if not done already. */ 73 if (cm_get_context(security_state) == NULL) 74 cm_set_context(&bl1_cpu_context[security_state], security_state); 75 76 /* Prepare the SPSR for the next BL image. */ 77 if ((security_state != SECURE) && (el_implemented(2) != EL_IMPL_NONE)) { 78 mode = MODE_EL2; 79 } 80 81 next_bl_ep->spsr = (uint32_t)SPSR_64((uint64_t) mode, 82 (uint64_t)MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS); 83 84 /* Allow platform to make change */ 85 bl1_plat_set_ep_info(image_id, next_bl_ep); 86 87 /* Prepare the context for the next BL image. */ 88 cm_init_my_context(next_bl_ep); 89 cm_prepare_el3_exit(security_state); 90 91 /* Indicate that image is in execution state. */ 92 desc->state = IMAGE_STATE_EXECUTED; 93 94 print_entry_point_info(next_bl_ep); 95 } 96