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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
45 lines
1.2 KiB
ArmAsm
45 lines
1.2 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 <arch.h>
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#include <asm_macros.S>
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#include <common/bl_common.h>
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.globl bl2_run_next_image
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func bl2_run_next_image
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mov x20,x0
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/* ---------------------------------------------
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* MMU needs to be disabled because both BL2 and BL31 execute
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* in EL3, and therefore share the same address space.
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* BL31 will initialize the address space according to its
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* own requirement.
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* ---------------------------------------------
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*/
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bl disable_mmu_icache_el3
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tlbi alle3
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bl bl2_el3_plat_prepare_exit
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#if ENABLE_PAUTH
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/* ---------------------------------------------
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* Disable pointer authentication before jumping
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* to next boot image.
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* ---------------------------------------------
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*/
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bl pauth_disable_el3
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#endif /* ENABLE_PAUTH */
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ldp x0, x1, [x20, #ENTRY_POINT_INFO_PC_OFFSET]
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msr elr_el3, x0
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msr spsr_el3, x1
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ldp x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)]
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ldp x4, x5, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x20)]
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ldp x2, x3, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x10)]
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ldp x0, x1, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x0)]
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exception_return
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endfunc bl2_run_next_image
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