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