1 /* 2 * Copyright (c) 2013-2025, 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 <arch_features.h> 11 #include <bl1/bl1.h> 12 #include <bl2/bl2.h> 13 #include <common/bl_common.h> 14 #include <common/build_message.h> 15 #include <common/debug.h> 16 #include <drivers/auth/auth_mod.h> 17 #include <drivers/auth/crypto_mod.h> 18 #include <drivers/console.h> 19 #include <drivers/fwu/fwu.h> 20 #include <lib/bootmarker_capture.h> 21 #include <lib/extensions/pauth.h> 22 #include <lib/pmf/pmf.h> 23 #include <plat/common/platform.h> 24 25 #include "bl2_private.h" 26 27 #ifdef __aarch64__ 28 #define NEXT_IMAGE "BL31" 29 #else 30 #define NEXT_IMAGE "BL32" 31 #endif 32 33 #if ENABLE_RUNTIME_INSTRUMENTATION 34 PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID, 35 BL_TOTAL_IDS, PMF_DUMP_ENABLE); 36 #endif 37 38 #if RESET_TO_BL2 39 /******************************************************************************* 40 * Setup function for BL2 when RESET_TO_BL2=1 41 ******************************************************************************/ 42 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 43 u_register_t arg3) 44 { 45 /* Enable early console if EARLY_CONSOLE flag is enabled */ 46 plat_setup_early_console(); 47 48 /* Perform early platform-specific setup */ 49 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 50 51 /* Perform late platform-specific setup */ 52 bl2_el3_plat_arch_setup(); 53 } 54 #else /* RESET_TO_BL2 */ 55 56 /******************************************************************************* 57 * Setup function for BL2 when RESET_TO_BL2=0 58 ******************************************************************************/ 59 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 60 u_register_t arg3) 61 { 62 /* Enable early console if EARLY_CONSOLE flag is enabled */ 63 plat_setup_early_console(); 64 65 /* Perform early platform-specific setup */ 66 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 67 68 /* Perform late platform-specific setup */ 69 bl2_plat_arch_setup(); 70 } 71 #endif /* RESET_TO_BL2 */ 72 73 /******************************************************************************* 74 * The only thing to do in BL2 is to load further images and pass control to 75 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 76 * runs entirely in S-EL1. 77 ******************************************************************************/ 78 void bl2_main(void) 79 { 80 entry_point_info_t *next_bl_ep_info; 81 82 #if ENABLE_RUNTIME_INSTRUMENTATION 83 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_ENTRY, PMF_CACHE_MAINT); 84 #endif 85 86 NOTICE("BL2: %s\n", build_version_string); 87 NOTICE("BL2: %s\n", build_message); 88 89 /* Perform remaining generic architectural setup in S-EL1 */ 90 bl2_arch_setup(); 91 92 #if PSA_FWU_SUPPORT 93 fwu_init(); 94 #endif /* PSA_FWU_SUPPORT */ 95 96 crypto_mod_init(); 97 98 /* Initialize authentication module */ 99 auth_mod_init(); 100 101 /* Initialize the Measured Boot backend */ 102 bl2_plat_mboot_init(); 103 104 /* Initialize boot source */ 105 bl2_plat_preload_setup(); 106 107 /* Load the subsequent bootloader images. */ 108 next_bl_ep_info = bl2_load_images(); 109 110 /* Teardown the Measured Boot backend */ 111 bl2_plat_mboot_finish(); 112 113 #if !BL2_RUNS_AT_EL3 114 #ifndef __aarch64__ 115 /* 116 * For AArch32 state BL1 and BL2 share the MMU setup. 117 * Given that BL2 does not map BL1 regions, MMU needs 118 * to be disabled in order to go back to BL1. 119 */ 120 disable_mmu_icache_secure(); 121 #endif /* !__aarch64__ */ 122 123 /* 124 * Disable pointer authentication before running next boot image 125 */ 126 if (is_feat_pauth_supported()) { 127 pauth_disable_el1(); 128 } 129 130 #if ENABLE_RUNTIME_INSTRUMENTATION 131 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 132 #endif 133 134 console_flush(); 135 136 /* 137 * Run next BL image via an SMC to BL1. Information on how to pass 138 * control to the BL32 (if present) and BL33 software images will 139 * be passed to next BL image as an argument. 140 */ 141 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 142 #else /* if BL2_RUNS_AT_EL3 */ 143 144 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 145 print_entry_point_info(next_bl_ep_info); 146 #if ENABLE_RUNTIME_INSTRUMENTATION 147 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 148 #endif 149 console_flush(); 150 151 /* 152 * Disable pointer authentication before running next boot image 153 */ 154 if (is_feat_pauth_supported()) { 155 pauth_disable_el3(); 156 } 157 158 bl2_run_next_image(next_bl_ep_info); 159 #endif /* BL2_RUNS_AT_EL3 */ 160 } 161