1 /* 2 * Copyright (c) 2013-2026, 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.h> 10 #include <arch_helpers.h> 11 #include <arch_features.h> 12 #include <bl1/bl1.h> 13 #include <bl2/bl2.h> 14 #include <common/bl_common.h> 15 #include <common/build_message.h> 16 #include <common/debug.h> 17 #include <drivers/auth/auth_mod.h> 18 #include <drivers/auth/crypto_mod.h> 19 #include <drivers/console.h> 20 #include <drivers/fwu/fwu.h> 21 #include <lib/bootmarker_capture.h> 22 #include <lib/extensions/pauth.h> 23 #include <lib/pmf/pmf.h> 24 #include <plat/common/platform.h> 25 26 #include "bl2_private.h" 27 28 #ifdef __aarch64__ 29 #define NEXT_IMAGE "BL31" 30 #else 31 #define NEXT_IMAGE "BL32" 32 #endif 33 34 #if ENABLE_RUNTIME_INSTRUMENTATION 35 PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID, 36 BL_TOTAL_IDS, PMF_DUMP_ENABLE); 37 #endif 38 39 /******************************************************************************* 40 * The only thing to do in BL2 is to load further images and pass control to 41 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. 42 ******************************************************************************/ 43 void __no_pauth bl2_main(u_register_t arg0, u_register_t arg1, u_register_t arg2, 44 u_register_t arg3) 45 { 46 entry_point_info_t *next_bl_ep_info; 47 48 /* Enable early console if EARLY_CONSOLE flag is enabled */ 49 plat_setup_early_console(); 50 51 /* Perform early platform-specific setup */ 52 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 53 54 /* Perform remaining generic architectural setup */ 55 bl2_arch_setup(); 56 57 /* Perform late platform-specific setup */ 58 bl2_plat_arch_setup(); 59 60 if (is_feat_pauth_supported()) { 61 #if BL2_RUNS_AT_EL3 62 pauth_init_enable_el3(); 63 #else 64 pauth_init_enable_el1(); 65 #endif 66 } 67 68 #if ENABLE_RUNTIME_INSTRUMENTATION 69 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_ENTRY, PMF_CACHE_MAINT); 70 #endif 71 72 NOTICE("BL2: %s\n", build_version_string); 73 NOTICE("BL2: %s\n", build_message); 74 75 #if PSA_FWU_SUPPORT 76 fwu_init(); 77 #endif /* PSA_FWU_SUPPORT */ 78 79 crypto_mod_init(); 80 81 /* Initialize authentication module */ 82 auth_mod_init(); 83 84 /* Initialize the Measured Boot backend */ 85 bl2_plat_mboot_init(); 86 87 /* Initialize boot source */ 88 bl2_plat_preload_setup(); 89 90 if (is_feat_crypto_supported()) { 91 #if BL2_RUNS_AT_EL3 92 disable_fpregs_traps_el3(); 93 #endif 94 } 95 96 /* Load the subsequent bootloader images. */ 97 next_bl_ep_info = bl2_load_images(); 98 99 if (is_feat_crypto_supported()) { 100 #if BL2_RUNS_AT_EL3 101 enable_fpregs_traps_el3(); 102 #endif 103 } 104 105 /* Teardown the Measured Boot backend */ 106 bl2_plat_mboot_finish(); 107 108 crypto_mod_finish(); 109 110 #if !BL2_RUNS_AT_EL3 111 #ifndef __aarch64__ 112 /* 113 * For AArch32 state BL1 and BL2 share the MMU setup. 114 * Given that BL2 does not map BL1 regions, MMU needs 115 * to be disabled in order to go back to BL1. 116 */ 117 disable_mmu_icache_secure(); 118 #endif /* !__aarch64__ */ 119 120 /* 121 * Disable pointer authentication before running next boot image 122 */ 123 if (is_feat_pauth_supported()) { 124 pauth_disable_el1(); 125 } 126 127 #if ENABLE_RUNTIME_INSTRUMENTATION 128 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 129 #endif 130 131 console_flush(); 132 133 /* 134 * Run next BL image via an SMC to BL1. Information on how to pass 135 * control to the BL32 (if present) and BL33 software images will 136 * be passed to next BL image as an argument. 137 */ 138 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 139 #else /* if BL2_RUNS_AT_EL3 */ 140 141 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 142 print_entry_point_info(next_bl_ep_info); 143 #if ENABLE_RUNTIME_INSTRUMENTATION 144 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 145 #endif 146 console_flush(); 147 148 /* 149 * Disable pointer authentication before running next boot image 150 */ 151 if (is_feat_pauth_supported()) { 152 pauth_disable_el3(); 153 } 154 155 bl2_run_next_image(next_bl_ep_info); 156 #endif /* BL2_RUNS_AT_EL3 */ 157 } 158