bl2/bl2_main.c

   1 /*
   2  * Copyright (c) 2013-2018, 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  * The only thing to do in BL2 is to load further images and pass control to
  26  * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2
  27  * runs entirely in S-EL1.
  28  ******************************************************************************/
  29 void bl2_main(void)
  30 {
  31         entry_point_info_t *next_bl_ep_info;
  32
  33         NOTICE("BL2: %s\n", version_string);
  34         NOTICE("BL2: %s\n", build_message);
  35
  36         /* Perform remaining generic architectural setup in S-EL1 */
  37         bl2_arch_setup();
  38
  39 #if TRUSTED_BOARD_BOOT
  40         /* Initialize authentication module */
  41         auth_mod_init();
  42 #endif /* TRUSTED_BOARD_BOOT */
  43
  44         /* initialize boot source */
  45         bl2_plat_preload_setup();
  46
  47         /* Load the subsequent bootloader images. */
  48         next_bl_ep_info = bl2_load_images();
  49
  50 #if !BL2_AT_EL3
  51 #ifdef AARCH32
  52         /*
  53          * For AArch32 state BL1 and BL2 share the MMU setup.
  54          * Given that BL2 does not map BL1 regions, MMU needs
  55          * to be disabled in order to go back to BL1.
  56          */
  57         disable_mmu_icache_secure();
  58 #endif /* AARCH32 */
  59
  60         console_flush();
  61
  62         /*
  63          * Run next BL image via an SMC to BL1. Information on how to pass
  64          * control to the BL32 (if present) and BL33 software images will
  65          * be passed to next BL image as an argument.
  66          */
  67         smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0);
  68 #else
  69         NOTICE("BL2: Booting " NEXT_IMAGE "\n");
  70         print_entry_point_info(next_bl_ep_info);
  71         console_flush();
  72
  73         bl2_run_next_image(next_bl_ep_info);
  74 #endif
  75 }