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https://github.com/ARM-software/arm-trusted-firmware.git
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6c09af9f8b
This patch enables BL2 to run in root world (EL3) which is needed as per the security model of RME-enabled systems. Using the existing BL2_AT_EL3 TF-A build option is not convenient because that option assumes TF-A BL1 doesn't exist, which is not the case for RME-enabled systems. For the purposes of RME, we use a normal BL1 image but we also want to run BL2 in EL3 as normally as possible, therefore rather than use the special bl2_entrypoint function in bl2_el3_entrypoint.S, we use a new bl2_entrypoint function (in bl2_rme_entrypoint.S) which doesn't need reset or mailbox initialization code seen in the el3_entrypoint_common macro. The patch also cleans up bl2_el3_entrypoint.S, moving the bl2_run_next_image function to its own file to avoid duplicating code. Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com> Change-Id: I99821b4cd550cadcb701f4c0c4dc36da81c7ef55
67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2021, Arm Limited. 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 <platform_def.h>
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#include <arch.h>
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#include <asm_macros.S>
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#include <common/bl_common.h>
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#include <el3_common_macros.S>
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.globl bl2_entrypoint
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func bl2_entrypoint
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/* Save arguments x0-x3 from previous Boot loader */
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mov x20, x0
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mov x21, x1
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mov x22, x2
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mov x23, x3
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el3_entrypoint_common \
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_init_sctlr=0 \
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_warm_boot_mailbox=0 \
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_secondary_cold_boot=0 \
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_init_memory=0 \
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_init_c_runtime=1 \
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_exception_vectors=bl2_el3_exceptions \
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_pie_fixup_size=0
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/* ---------------------------------------------
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* Restore parameters of boot rom
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* ---------------------------------------------
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*/
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mov x0, x20
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mov x1, x21
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mov x2, x22
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mov x3, x23
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/* ---------------------------------------------
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* Perform BL2 setup
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* ---------------------------------------------
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*/
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bl bl2_setup
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#if ENABLE_PAUTH
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/* ---------------------------------------------
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* Program APIAKey_EL1 and enable pointer authentication.
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* ---------------------------------------------
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*/
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bl pauth_init_enable_el3
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#endif /* ENABLE_PAUTH */
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/* ---------------------------------------------
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* Jump to main function.
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* ---------------------------------------------
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*/
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bl bl2_main
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/* ---------------------------------------------
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* Should never reach this point.
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* ---------------------------------------------
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*/
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no_ret plat_panic_handler
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endfunc bl2_entrypoint
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