blob: 37839993d41d5cdfdb4f6fe3e67f2c94ae7347c0 [file] [log] [blame]
/*
* Copyright (c) 2013-2021, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <arch_helpers.h>
#include <arch_features.h>
#include <bl1/bl1.h>
#include <bl2/bl2.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/auth/auth_mod.h>
#include <drivers/console.h>
#if MEASURED_BOOT
#include <drivers/measured_boot/measured_boot.h>
#endif
#include <lib/extensions/pauth.h>
#include <plat/common/platform.h>
#include "bl2_private.h"
#ifdef __aarch64__
#define NEXT_IMAGE "BL31"
#else
#define NEXT_IMAGE "BL32"
#endif
#if BL2_AT_EL3
/*******************************************************************************
* Setup function for BL2 when BL2_AT_EL3=1
******************************************************************************/
void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3)
{
/* Perform early platform-specific setup */
bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3);
/* Perform late platform-specific setup */
bl2_el3_plat_arch_setup();
#if CTX_INCLUDE_PAUTH_REGS
/*
* Assert that the ARMv8.3-PAuth registers are present or an access
* fault will be triggered when they are being saved or restored.
*/
assert(is_armv8_3_pauth_present());
#endif /* CTX_INCLUDE_PAUTH_REGS */
}
#else /* BL2_AT_EL3 */
/*******************************************************************************
* Setup function for BL2. This function is used when ENABLE_RME=1
******************************************************************************/
void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3)
{
/* Perform early platform-specific setup */
bl2_early_platform_setup2(arg0, arg1, arg2, arg3);
/* Perform late platform-specific setup */
bl2_plat_arch_setup();
#if CTX_INCLUDE_PAUTH_REGS
/*
* Assert that the ARMv8.3-PAuth registers are present or an access
* fault will be triggered when they are being saved or restored.
*/
assert(is_armv8_3_pauth_present());
#endif /* CTX_INCLUDE_PAUTH_REGS */
}
#endif /* BL2_AT_EL3 */
/*******************************************************************************
* The only thing to do in BL2 is to load further images and pass control to
* next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2
* runs entirely in S-EL1.
******************************************************************************/
void bl2_main(void)
{
entry_point_info_t *next_bl_ep_info;
NOTICE("BL2: %s\n", version_string);
NOTICE("BL2: %s\n", build_message);
/* Perform remaining generic architectural setup in S-EL1 */
bl2_arch_setup();
#if TRUSTED_BOARD_BOOT
/* Initialize authentication module */
auth_mod_init();
#if MEASURED_BOOT
/* Initialize measured boot module */
measured_boot_init();
#endif /* MEASURED_BOOT */
#endif /* TRUSTED_BOARD_BOOT */
/* Initialize boot source */
bl2_plat_preload_setup();
/* Load the subsequent bootloader images. */
next_bl_ep_info = bl2_load_images();
#if MEASURED_BOOT
/* Finalize measured boot */
measured_boot_finish();
#endif /* MEASURED_BOOT */
#if !BL2_AT_EL3 && !ENABLE_RME
#ifndef __aarch64__
/*
* For AArch32 state BL1 and BL2 share the MMU setup.
* Given that BL2 does not map BL1 regions, MMU needs
* to be disabled in order to go back to BL1.
*/
disable_mmu_icache_secure();
#endif /* !__aarch64__ */
console_flush();
#if ENABLE_PAUTH
/*
* Disable pointer authentication before running next boot image
*/
pauth_disable_el1();
#endif /* ENABLE_PAUTH */
/*
* Run next BL image via an SMC to BL1. Information on how to pass
* control to the BL32 (if present) and BL33 software images will
* be passed to next BL image as an argument.
*/
smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0);
#else /* if BL2_AT_EL3 */
NOTICE("BL2: Booting " NEXT_IMAGE "\n");
print_entry_point_info(next_bl_ep_info);
console_flush();
#if ENABLE_PAUTH
/*
* Disable pointer authentication before running next boot image
*/
pauth_disable_el3();
#endif /* ENABLE_PAUTH */
bl2_run_next_image(next_bl_ep_info);
#endif /* BL2_AT_EL3 */
}