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 /******************************************************************************* 25 * Setup function for BL2. 26 ******************************************************************************/ 27 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2, 28 u_register_t arg3) 29 { 30 /* Perform early platform-specific setup */ 31 bl2_early_platform_setup2(arg0, arg1, arg2, arg3); 32 33 #ifdef AARCH64 34 /* 35 * Update pointer authentication key before the MMU is enabled. It is 36 * saved in the rodata section, that can be writen before enabling the 37 * MMU. This function must be called after the console is initialized 38 * in the early platform setup. 39 */ 40 bl_handle_pauth(); 41 #endif /* AARCH64 */ 42 43 /* Perform late platform-specific setup */ 44 bl2_plat_arch_setup(); 45 } 46 47 /******************************************************************************* 48 * The only thing to do in BL2 is to load further images and pass control to 49 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2 50 * runs entirely in S-EL1. 51 ******************************************************************************/ 52 void bl2_main(void) 53 { 54 entry_point_info_t *next_bl_ep_info; 55 56 NOTICE("BL2: %s\n", version_string); 57 NOTICE("BL2: %s\n", build_message); 58 59 /* Perform remaining generic architectural setup in S-EL1 */ 60 bl2_arch_setup(); 61 62 #if TRUSTED_BOARD_BOOT 63 /* Initialize authentication module */ 64 auth_mod_init(); 65 #endif /* TRUSTED_BOARD_BOOT */ 66 67 /* initialize boot source */ 68 bl2_plat_preload_setup(); 69 70 /* Load the subsequent bootloader images. */ 71 next_bl_ep_info = bl2_load_images(); 72 73 #if !BL2_AT_EL3 74 #ifdef AARCH32 75 /* 76 * For AArch32 state BL1 and BL2 share the MMU setup. 77 * Given that BL2 does not map BL1 regions, MMU needs 78 * to be disabled in order to go back to BL1. 79 */ 80 disable_mmu_icache_secure(); 81 #endif /* AARCH32 */ 82 83 console_flush(); 84 85 /* 86 * Run next BL image via an SMC to BL1. Information on how to pass 87 * control to the BL32 (if present) and BL33 software images will 88 * be passed to next BL image as an argument. 89 */ 90 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0); 91 #else 92 NOTICE("BL2: Booting " NEXT_IMAGE "\n"); 93 print_entry_point_info(next_bl_ep_info); 94 console_flush(); 95 96 bl2_run_next_image(next_bl_ep_info); 97 #endif 98 } 99