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 <arch_helpers.h> 8 #include <assert.h> 9 #include <context.h> 10 #include <context_mgmt.h> 11 #include <debug.h> 12 #include <platform.h> 13 #include "../bl1_private.h" 14 15 /* 16 * Following array will be used for context management. 17 * There are 2 instances, for the Secure and Non-Secure contexts. 18 */ 19 static cpu_context_t bl1_cpu_context[2]; 20 21 /* Following contains the cpu context pointers. */ 22 static void *bl1_cpu_context_ptr[2]; 23 24 25 void *cm_get_context(uint32_t security_state) 26 { 27 assert(sec_state_is_valid(security_state)); 28 return bl1_cpu_context_ptr[security_state]; 29 } 30 31 void cm_set_context(void *context, uint32_t security_state) 32 { 33 assert(sec_state_is_valid(security_state)); 34 bl1_cpu_context_ptr[security_state] = context; 35 } 36 37 /******************************************************************************* 38 * This function prepares the context for Secure/Normal world images. 39 * Normal world images are transitioned to EL2(if supported) else EL1. 40 ******************************************************************************/ 41 void bl1_prepare_next_image(unsigned int image_id) 42 { 43 unsigned int security_state; 44 image_desc_t *image_desc; 45 entry_point_info_t *next_bl_ep; 46 47 #if CTX_INCLUDE_AARCH32_REGS 48 /* 49 * Ensure that the build flag to save AArch32 system registers in CPU 50 * context is not set for AArch64-only platforms. 51 */ 52 if (el_implemented(1) == EL_IMPL_A64ONLY) { 53 ERROR("EL1 supports AArch64-only. Please set build flag " 54 "CTX_INCLUDE_AARCH32_REGS = 0\n"); 55 panic(); 56 } 57 #endif 58 59 /* Get the image descriptor. */ 60 image_desc = bl1_plat_get_image_desc(image_id); 61 assert(image_desc); 62 63 /* Get the entry point info. */ 64 next_bl_ep = &image_desc->ep_info; 65 66 /* Get the image security state. */ 67 security_state = GET_SECURITY_STATE(next_bl_ep->h.attr); 68 69 /* Setup the Secure/Non-Secure context if not done already. */ 70 if (!cm_get_context(security_state)) 71 cm_set_context(&bl1_cpu_context[security_state], security_state); 72 73 /* Prepare the SPSR for the next BL image. */ 74 if (security_state == SECURE) { 75 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 76 DISABLE_ALL_EXCEPTIONS); 77 } else { 78 /* Use EL2 if supported; else use EL1. */ 79 if (el_implemented(2) != EL_IMPL_NONE) { 80 next_bl_ep->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, 81 DISABLE_ALL_EXCEPTIONS); 82 } else { 83 next_bl_ep->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX, 84 DISABLE_ALL_EXCEPTIONS); 85 } 86 } 87 88 /* Allow platform to make change */ 89 bl1_plat_set_ep_info(image_id, next_bl_ep); 90 91 /* Prepare the context for the next BL image. */ 92 cm_init_my_context(next_bl_ep); 93 cm_prepare_el3_exit(security_state); 94 95 /* Indicate that image is in execution state. */ 96 image_desc->state = IMAGE_STATE_EXECUTED; 97 98 print_entry_point_info(next_bl_ep); 99 } 100