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 <arch_helpers.h> 8 #include <bl1/bl1.h> 9 #include <bl2/bl2.h> 10 #include <common/bl_common.h> 11 #include <common/debug.h> 12 #include <drivers/auth/auth_mod.h> 13 #include <drivers/console.h> 14 #include <plat/common/platform.h> 15 16 #include "bl2_private.h" 17 18 #ifdef AARCH32 19 #define NEXT_IMAGE "BL32" 20 #else 21 #define NEXT_IMAGE "BL31" 22 #endif 23 24 #if !BL2_AT_EL3 25 /******************************************************************************* 26 * Setup function for BL2. 27 ******************************************************************************/ 28 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 29 u_register_t arg3) 30 { 31 /* Perform early platform-specific setup */ 32 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 33 34 #ifdef AARCH64 35 /* 36 * Update pointer authentication key before the MMU is enabled. It is 37 * saved in the rodata section, that can be writen before enabling the 38 * MMU. This function must be called after the console is initialized 39 * in the early platform setup. 40 */ 41 bl_handle_pauth(); 42 #endif /* AARCH64 */ 43 44 /* Perform late platform-specific setup */ 45 bl2_plat_arch_setup(); 46 } 47 48 #else /* if BL2_AT_EL3 */ 49 /******************************************************************************* 50 * Setup function for BL2 when BL2_AT_EL3=1. 51 ******************************************************************************/ 52 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 53 u_register_t arg3) 54 { 55 /* Perform early platform-specific setup */ 56 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3); 57 58 #ifdef AARCH64 59 /* 60 * Update pointer authentication key before the MMU is enabled. It is 61 * saved in the rodata section, that can be writen before enabling the 62 * MMU. This function must be called after the console is initialized 63 * in the early platform setup. 64 */ 65 bl_handle_pauth(); 66 #endif /* AARCH64 */ 67 68 /* Perform late platform-specific setup */ 69 bl2_el3_plat_arch_setup(); 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 #ifdef AARCH32 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 /* AARCH32 */ 108 109 console_flush(); 110 111 /* 112 * Run next BL image via an SMC to BL1. Information on how to pass 113 * control to the BL32 (if present) and BL33 software images will 114 * be passed to next BL image as an argument. 115 */ 116 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 117 #else /* if BL2_AT_EL3 */ 118 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 119 print_entry_point_info(next_bl_ep_info); 120 console_flush(); 121 122 bl2_run_next_image(next_bl_ep_info); 123 #endif /* BL2_AT_EL3 */ 124 } 125