bl2/bl2_main.c

   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 }