1 /* 2 * Copyright (c) 2013-2021, 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/console.h> 17 #include <drivers/fwu/fwu.h> 18 #if MEASURED_BOOT 19 #include <drivers/measured_boot/measured_boot.h> 20 #endif 21 #include <lib/extensions/pauth.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 BL2_AT_EL3 33 /******************************************************************************* 34 * Setup function for BL2 when BL2_AT_EL3=1 35 ******************************************************************************/ 36 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 37 u_register_t arg3) 38 { 39 /* Perform early platform-specific setup */ 40 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 41 42 /* Perform late platform-specific setup */ 43 bl2_el3_plat_arch_setup(); 44 45 #if CTX_INCLUDE_PAUTH_REGS 46 /* 47 * Assert that the ARMv8.3-PAuth registers are present or an access 48 * fault will be triggered when they are being saved or restored. 49 */ 50 assert(is_armv8_3_pauth_present()); 51 #endif /* CTX_INCLUDE_PAUTH_REGS */ 52 } 53 #else /* BL2_AT_EL3 */ 54 /******************************************************************************* 55 * Setup function for BL2 when BL2_AT_EL3=0 56 ******************************************************************************/ 57 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 58 u_register_t arg3) 59 { 60 /* Perform early platform-specific setup */ 61 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 62 63 /* Perform late platform-specific setup */ 64 bl2_plat_arch_setup(); 65 66 #if CTX_INCLUDE_PAUTH_REGS 67 /* 68 * Assert that the ARMv8.3-PAuth registers are present or an access 69 * fault will be triggered when they are being saved or restored. 70 */ 71 assert(is_armv8_3_pauth_present()); 72 #endif /* CTX_INCLUDE_PAUTH_REGS */ 73 } 74 #endif /* BL2_AT_EL3 */ 75 76 /******************************************************************************* 77 * The only thing to do in BL2 is to load further images and pass control to 78 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 79 * runs entirely in S-EL1. 80 ******************************************************************************/ 81 void bl2_main(void) 82 { 83 entry_point_info_t *next_bl_ep_info; 84 85 NOTICE("BL2: %s\n", version_string); 86 NOTICE("BL2: %s\n", build_message); 87 88 /* Perform remaining generic architectural setup in S-EL1 */ 89 bl2_arch_setup(); 90 91 #if PSA_FWU_SUPPORT 92 fwu_init(); 93 #endif /* PSA_FWU_SUPPORT */ 94 95 #if TRUSTED_BOARD_BOOT 96 /* Initialize authentication module */ 97 auth_mod_init(); 98 99 #if MEASURED_BOOT 100 /* Initialize measured boot module */ 101 measured_boot_init(); 102 103 #endif /* MEASURED_BOOT */ 104 #endif /* TRUSTED_BOARD_BOOT */ 105 106 /* Initialize boot source */ 107 bl2_plat_preload_setup(); 108 109 /* Load the subsequent bootloader images. */ 110 next_bl_ep_info = bl2_load_images(); 111 112 #if MEASURED_BOOT 113 /* Finalize measured boot */ 114 measured_boot_finish(); 115 #endif /* MEASURED_BOOT */ 116 117 #if !BL2_AT_EL3 && !ENABLE_RME 118 #ifndef __aarch64__ 119 /* 120 * For AArch32 state BL1 and BL2 share the MMU setup. 121 * Given that BL2 does not map BL1 regions, MMU needs 122 * to be disabled in order to go back to BL1. 123 */ 124 disable_mmu_icache_secure(); 125 #endif /* !__aarch64__ */ 126 127 console_flush(); 128 129 #if ENABLE_PAUTH 130 /* 131 * Disable pointer authentication before running next boot image 132 */ 133 pauth_disable_el1(); 134 #endif /* ENABLE_PAUTH */ 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_AT_EL3 || ENABLE_RME */ 143 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 144 print_entry_point_info(next_bl_ep_info); 145 console_flush(); 146 147 #if ENABLE_PAUTH 148 /* 149 * Disable pointer authentication before running next boot image 150 */ 151 pauth_disable_el3(); 152 #endif /* ENABLE_PAUTH */ 153 154 bl2_run_next_image(next_bl_ep_info); 155 #endif /* BL2_AT_EL3 && ENABLE_RME */ 156 } 157