1 /* 2 * Copyright (c) 2013-2024, 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 /* Perform early platform-specific setup */ 46 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 47 48 /* Perform late platform-specific setup */ 49 bl2_el3_plat_arch_setup(); 50 51 #if CTX_INCLUDE_PAUTH_REGS 52 /* 53 * Assert that the ARMv8.3-PAuth registers are present or an access 54 * fault will be triggered when they are being saved or restored. 55 */ 56 assert(is_armv8_3_pauth_present()); 57 #endif /* CTX_INCLUDE_PAUTH_REGS */ 58 } 59 #else /* RESET_TO_BL2 */ 60 61 /******************************************************************************* 62 * Setup function for BL2 when RESET_TO_BL2=0 63 ******************************************************************************/ 64 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 65 u_register_t arg3) 66 { 67 /* Perform early platform-specific setup */ 68 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 69 70 /* Perform late platform-specific setup */ 71 bl2_plat_arch_setup(); 72 73 #if CTX_INCLUDE_PAUTH_REGS 74 /* 75 * Assert that the ARMv8.3-PAuth registers are present or an access 76 * fault will be triggered when they are being saved or restored. 77 */ 78 assert(is_armv8_3_pauth_present()); 79 #endif /* CTX_INCLUDE_PAUTH_REGS */ 80 } 81 #endif /* RESET_TO_BL2 */ 82 83 /******************************************************************************* 84 * The only thing to do in BL2 is to load further images and pass control to 85 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 86 * runs entirely in S-EL1. 87 ******************************************************************************/ 88 void bl2_main(void) 89 { 90 entry_point_info_t *next_bl_ep_info; 91 92 #if ENABLE_RUNTIME_INSTRUMENTATION 93 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_ENTRY, PMF_CACHE_MAINT); 94 #endif 95 96 NOTICE("BL2: %s\n", build_version_string); 97 NOTICE("BL2: %s\n", build_message); 98 99 /* Perform remaining generic architectural setup in S-EL1 */ 100 bl2_arch_setup(); 101 102 #if PSA_FWU_SUPPORT 103 fwu_init(); 104 #endif /* PSA_FWU_SUPPORT */ 105 106 crypto_mod_init(); 107 108 /* Initialize authentication module */ 109 auth_mod_init(); 110 111 /* Initialize the Measured Boot backend */ 112 bl2_plat_mboot_init(); 113 114 /* Initialize boot source */ 115 bl2_plat_preload_setup(); 116 117 /* Load the subsequent bootloader images. */ 118 next_bl_ep_info = bl2_load_images(); 119 120 /* Teardown the Measured Boot backend */ 121 bl2_plat_mboot_finish(); 122 123 #if !BL2_RUNS_AT_EL3 124 #ifndef __aarch64__ 125 /* 126 * For AArch32 state BL1 and BL2 share the MMU setup. 127 * Given that BL2 does not map BL1 regions, MMU needs 128 * to be disabled in order to go back to BL1. 129 */ 130 disable_mmu_icache_secure(); 131 #endif /* !__aarch64__ */ 132 133 #if ENABLE_PAUTH 134 /* 135 * Disable pointer authentication before running next boot image 136 */ 137 pauth_disable_el1(); 138 #endif /* ENABLE_PAUTH */ 139 140 #if ENABLE_RUNTIME_INSTRUMENTATION 141 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 142 #endif 143 144 console_flush(); 145 146 /* 147 * Run next BL image via an SMC to BL1. Information on how to pass 148 * control to the BL32 (if present) and BL33 software images will 149 * be passed to next BL image as an argument. 150 */ 151 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 152 #else /* if BL2_RUNS_AT_EL3 */ 153 154 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 155 print_entry_point_info(next_bl_ep_info); 156 #if ENABLE_RUNTIME_INSTRUMENTATION 157 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 158 #endif 159 console_flush(); 160 161 #if ENABLE_PAUTH 162 /* 163 * Disable pointer authentication before running next boot image 164 */ 165 pauth_disable_el3(); 166 #endif /* ENABLE_PAUTH */ 167 168 bl2_run_next_image(next_bl_ep_info); 169 #endif /* BL2_RUNS_AT_EL3 */ 170 } 171