1 /* 2 * Copyright (c) 2013-2019, 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 <lib/extensions/pauth.h> 18 #include <plat/common/platform.h> 19 20 #include "bl2_private.h" 21 22 #ifdef __aarch64__ 23 #define NEXT_IMAGE "BL31" 24 #else 25 #define NEXT_IMAGE "BL32" 26 #endif 27 28 #if !BL2_AT_EL3 29 /******************************************************************************* 30 * Setup function for BL2. 31 ******************************************************************************/ 32 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 33 u_register_t arg3) 34 { 35 /* Perform early platform-specific setup */ 36 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 37 38 /* Perform late platform-specific setup */ 39 bl2_plat_arch_setup(); 40 41 #if CTX_INCLUDE_PAUTH_REGS 42 /* 43 * Assert that the ARMv8.3-PAuth registers are present or an access 44 * fault will be triggered when they are being saved or restored. 45 */ 46 assert(is_armv8_3_pauth_present()); 47 #endif /* CTX_INCLUDE_PAUTH_REGS */ 48 } 49 50 #else /* if BL2_AT_EL3 */ 51 /******************************************************************************* 52 * Setup function for BL2 when BL2_AT_EL3=1. 53 ******************************************************************************/ 54 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 55 u_register_t arg3) 56 { 57 /* Perform early platform-specific setup */ 58 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 59 60 /* Perform late platform-specific setup */ 61 bl2_el3_plat_arch_setup(); 62 63 #if CTX_INCLUDE_PAUTH_REGS 64 /* 65 * Assert that the ARMv8.3-PAuth registers are present or an access 66 * fault will be triggered when they are being saved or restored. 67 */ 68 assert(is_armv8_3_pauth_present()); 69 #endif /* CTX_INCLUDE_PAUTH_REGS */ 70 } 71 #endif /* BL2_AT_EL3 */ 72 73 /******************************************************************************* 74 * The only thing to do in BL2 is to load further images and pass control to 75 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 76 * runs entirely in S-EL1. 77 ******************************************************************************/ 78 void bl2_main(void) 79 { 80 entry_point_info_t *next_bl_ep_info; 81 82 NOTICE("BL2: %s\n", version_string); 83 NOTICE("BL2: %s\n", build_message); 84 85 /* Perform remaining generic architectural setup in S-EL1 */ 86 bl2_arch_setup(); 87 88 #if TRUSTED_BOARD_BOOT 89 /* Initialize authentication module */ 90 auth_mod_init(); 91 #endif /* TRUSTED_BOARD_BOOT */ 92 93 /* initialize boot source */ 94 bl2_plat_preload_setup(); 95 96 /* Load the subsequent bootloader images. */ 97 next_bl_ep_info = bl2_load_images(); 98 99 #if !BL2_AT_EL3 100 #ifndef __aarch64__ 101 /* 102 * For AArch32 state BL1 and BL2 share the MMU setup. 103 * Given that BL2 does not map BL1 regions, MMU needs 104 * to be disabled in order to go back to BL1. 105 */ 106 disable_mmu_icache_secure(); 107 #endif /* !__aarch64__ */ 108 109 console_flush(); 110 111 #if ENABLE_PAUTH 112 /* 113 * Disable pointer authentication before running next boot image 114 */ 115 pauth_disable_el1(); 116 #endif /* ENABLE_PAUTH */ 117 118 /* 119 * Run next BL image via an SMC to BL1. Information on how to pass 120 * control to the BL32 (if present) and BL33 software images will 121 * be passed to next BL image as an argument. 122 */ 123 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 124 #else /* if BL2_AT_EL3 */ 125 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 126 print_entry_point_info(next_bl_ep_info); 127 console_flush(); 128 129 #if ENABLE_PAUTH 130 /* 131 * Disable pointer authentication before running next boot image 132 */ 133 pauth_disable_el3(); 134 #endif /* ENABLE_PAUTH */ 135 136 bl2_run_next_image(next_bl_ep_info); 137 #endif /* BL2_AT_EL3 */ 138 } 139