1 /* 2 * Copyright (c) 2015-2018, 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 /* 18 * Following array will be used for context management. 19 * There are 2 instances, for the Secure and Non-Secure contexts. 20 */ 21 static cpu_context_t bl1_cpu_context[2]; 22 23 /* Following contains the cpu context pointers. */ 24 static void *bl1_cpu_context_ptr[2]; 25 26 27 void *cm_get_context(uint32_t security_state) 28 { 29 assert(sec_state_is_valid(security_state)); 30 return bl1_cpu_context_ptr[security_state]; 31 } 32 33 void cm_set_context(void *context, uint32_t security_state) 34 { 35 assert(sec_state_is_valid(security_state)); 36 bl1_cpu_context_ptr[security_state] = context; 37 } 38 39 /******************************************************************************* 40 * This function prepares the context for Secure/Normal world images. 41 * Normal world images are transitioned to EL2(if supported) else EL1. 42 ******************************************************************************/ 43 void bl1_prepare_next_image(unsigned int image_id) 44 { 45 unsigned int security_state; 46 image_desc_t *image_desc; 47 entry_point_info_t *next_bl_ep; 48 49 #if CTX_INCLUDE_AARCH32_REGS 50 /* 51 * Ensure that the build flag to save AArch32 system registers in CPU 52 * context is not set for AArch64-only platforms. 53 */ 54 if (el_implemented(1) == EL_IMPL_A64ONLY) { 55 ERROR("EL1 supports AArch64-only. Please set build flag " 56 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 57 panic(); 58 } 59 #endif 60 61 /* Get the image descriptor. */ 62 image_desc = bl1_plat_get_image_desc(image_id); 63 assert(image_desc); 64 65 /* Get the entry point info. */ 66 next_bl_ep = &image_desc->ep_info; 67 68 /* Get the image security state. */ 69 security_state = GET_SECURITY_STATE(next_bl_ep->h.attr); 70 71 /* Setup the Secure/Non-Secure context if not done already. */ 72 if (!cm_get_context(security_state)) 73 cm_set_context(&bl1_cpu_context[security_state], security_state); 74 75 /* Prepare the SPSR for the next BL image. */ 76 if (security_state == SECURE) { 77 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 78 DISABLE_ALL_EXCEPTIONS); 79 } else { 80 /* Use EL2 if supported; else use EL1. */ 81 if (el_implemented(2) != EL_IMPL_NONE) { 82 next_bl_ep->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, 83 DISABLE_ALL_EXCEPTIONS); 84 } else { 85 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 86 DISABLE_ALL_EXCEPTIONS); 87 } 88 } 89 90 /* Allow platform to make change */ 91 bl1_plat_set_ep_info(image_id, next_bl_ep); 92 93 /* Prepare the context for the next BL image. */ 94 cm_init_my_context(next_bl_ep); 95 cm_prepare_el3_exit(security_state); 96 97 /* Indicate that image is in execution state. */ 98 image_desc->state = IMAGE_STATE_EXECUTED; 99 100 print_entry_point_info(next_bl_ep); 101 } 102