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https://github.com/ARM-software/arm-trusted-firmware.git
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b1d27b484f
This patch enables BL2 to execute at the highest exception level without any dependancy on TF BL1. This enables platforms which already have a non-TF Boot ROM to directly load and execute BL2 and subsequent BL stages without need for BL1. This is not currently possible because BL2 executes at S-EL1 and cannot jump straight to EL3. Change-Id: Ief1efca4598560b1b8c8e61fbe26d1f44e929d69 Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch_helpers.h>
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#include <auth_mod.h>
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#include <bl1.h>
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#include <bl_common.h>
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#include <console.h>
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#include <debug.h>
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#include <platform.h>
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#include "bl2_private.h"
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#ifdef AARCH32
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#define NEXT_IMAGE "BL32"
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#else
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#define NEXT_IMAGE "BL31"
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#endif
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/*******************************************************************************
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* The only thing to do in BL2 is to load further images and pass control to
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* next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2
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* runs entirely in S-EL1.
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******************************************************************************/
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void bl2_main(void)
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{
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entry_point_info_t *next_bl_ep_info;
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NOTICE("BL2: %s\n", version_string);
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NOTICE("BL2: %s\n", build_message);
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/* Perform remaining generic architectural setup in S-EL1 */
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bl2_arch_setup();
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#if TRUSTED_BOARD_BOOT
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/* Initialize authentication module */
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auth_mod_init();
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#endif /* TRUSTED_BOARD_BOOT */
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/* initialize boot source */
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bl2_plat_preload_setup();
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/* Load the subsequent bootloader images. */
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next_bl_ep_info = bl2_load_images();
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#ifdef AARCH32
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/*
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* For AArch32 state BL1 and BL2 share the MMU setup.
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* Given that BL2 does not map BL1 regions, MMU needs
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* to be disabled in order to go back to BL1.
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*/
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disable_mmu_icache_secure();
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#endif /* AARCH32 */
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#if !BL2_AT_EL3
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console_flush();
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/*
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* Run next BL image via an SMC to BL1. Information on how to pass
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* control to the BL32 (if present) and BL33 software images will
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* be passed to next BL image as an argument.
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*/
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smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0);
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#else
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NOTICE("BL2: Booting " NEXT_IMAGE "\n");
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print_entry_point_info(next_bl_ep_info);
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console_flush();
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bl2_run_next_image(next_bl_ep_info);
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#endif
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}
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