1 /* 2 * Copyright (c) 2013-2023, 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/debug.h> 15 #include <drivers/auth/auth_mod.h> 16 #include <drivers/auth/crypto_mod.h> 17 #include <drivers/console.h> 18 #include <drivers/fwu/fwu.h> 19 #include <lib/bootmarker_capture.h> 20 #include <lib/extensions/pauth.h> 21 #include <lib/pmf/pmf.h> 22 #include <plat/common/platform.h> 23 24 #include "bl2_private.h" 25 26 #ifdef __aarch64__ 27 #define NEXT_IMAGE "BL31" 28 #else 29 #define NEXT_IMAGE "BL32" 30 #endif 31 32 #if ENABLE_RUNTIME_INSTRUMENTATION 33 PMF_REGISTER_SERVICE(bl_svc, PMF_RT_INSTR_SVC_ID, 34 BL_TOTAL_IDS, PMF_DUMP_ENABLE); 35 #endif 36 37 #if RESET_TO_BL2 38 /******************************************************************************* 39 * Setup function for BL2 when RESET_TO_BL2=1 40 ******************************************************************************/ 41 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 42 u_register_t arg3) 43 { 44 /* Perform early platform-specific setup */ 45 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 46 47 /* Perform late platform-specific setup */ 48 bl2_el3_plat_arch_setup(); 49 50 #if CTX_INCLUDE_PAUTH_REGS 51 /* 52 * Assert that the ARMv8.3-PAuth registers are present or an access 53 * fault will be triggered when they are being saved or restored. 54 */ 55 assert(is_armv8_3_pauth_present()); 56 #endif /* CTX_INCLUDE_PAUTH_REGS */ 57 } 58 #else /* RESET_TO_BL2 */ 59 60 /******************************************************************************* 61 * Setup function for BL2 when RESET_TO_BL2=0 62 ******************************************************************************/ 63 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 64 u_register_t arg3) 65 { 66 /* Perform early platform-specific setup */ 67 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 68 69 /* Perform late platform-specific setup */ 70 bl2_plat_arch_setup(); 71 72 #if CTX_INCLUDE_PAUTH_REGS 73 /* 74 * Assert that the ARMv8.3-PAuth registers are present or an access 75 * fault will be triggered when they are being saved or restored. 76 */ 77 assert(is_armv8_3_pauth_present()); 78 #endif /* CTX_INCLUDE_PAUTH_REGS */ 79 } 80 #endif /* RESET_TO_BL2 */ 81 82 /******************************************************************************* 83 * The only thing to do in BL2 is to load further images and pass control to 84 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 85 * runs entirely in S-EL1. 86 ******************************************************************************/ 87 void bl2_main(void) 88 { 89 entry_point_info_t *next_bl_ep_info; 90 91 #if ENABLE_RUNTIME_INSTRUMENTATION 92 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_ENTRY, PMF_CACHE_MAINT); 93 #endif 94 95 NOTICE("BL2: %s\n", version_string); 96 NOTICE("BL2: %s\n", build_message); 97 98 /* Perform remaining generic architectural setup in S-EL1 */ 99 bl2_arch_setup(); 100 101 #if PSA_FWU_SUPPORT 102 fwu_init(); 103 #endif /* PSA_FWU_SUPPORT */ 104 105 crypto_mod_init(); 106 107 /* Initialize authentication module */ 108 auth_mod_init(); 109 110 /* Initialize the Measured Boot backend */ 111 bl2_plat_mboot_init(); 112 113 /* Initialize boot source */ 114 bl2_plat_preload_setup(); 115 116 /* Load the subsequent bootloader images. */ 117 next_bl_ep_info = bl2_load_images(); 118 119 /* Teardown the Measured Boot backend */ 120 bl2_plat_mboot_finish(); 121 122 #if !BL2_RUNS_AT_EL3 123 #ifndef __aarch64__ 124 /* 125 * For AArch32 state BL1 and BL2 share the MMU setup. 126 * Given that BL2 does not map BL1 regions, MMU needs 127 * to be disabled in order to go back to BL1. 128 */ 129 disable_mmu_icache_secure(); 130 #endif /* !__aarch64__ */ 131 132 #if ENABLE_PAUTH 133 /* 134 * Disable pointer authentication before running next boot image 135 */ 136 pauth_disable_el1(); 137 #endif /* ENABLE_PAUTH */ 138 139 #if ENABLE_RUNTIME_INSTRUMENTATION 140 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 141 #endif 142 143 console_flush(); 144 145 /* 146 * Run next BL image via an SMC to BL1. Information on how to pass 147 * control to the BL32 (if present) and BL33 software images will 148 * be passed to next BL image as an argument. 149 */ 150 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 151 #else /* if BL2_RUNS_AT_EL3 */ 152 153 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 154 print_entry_point_info(next_bl_ep_info); 155 #if ENABLE_RUNTIME_INSTRUMENTATION 156 PMF_CAPTURE_TIMESTAMP(bl_svc, BL2_EXIT, PMF_CACHE_MAINT); 157 #endif 158 console_flush(); 159 160 #if ENABLE_PAUTH 161 /* 162 * Disable pointer authentication before running next boot image 163 */ 164 pauth_disable_el3(); 165 #endif /* ENABLE_PAUTH */ 166 167 bl2_run_next_image(next_bl_ep_info); 168 #endif /* BL2_RUNS_AT_EL3 */ 169 } 170