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Luma3DS-3GX/loader/source/start.s

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@ This file is part of Luma3DS
@ Copyright (C) 2017 Aurora Wright, TuxSH
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@
@ This program is free software: you can redistribute it and/or modify
@ it under the terms of the GNU General Public License as published by
@ the Free Software Foundation, either version 3 of the License, or
@ (at your option) any later version.
@
@ This program is distributed in the hope that it will be useful,
@ but WITHOUT ANY WARRANTY; without even the implied warranty of
@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
@ GNU General Public License for more details.
@
@ You should have received a copy of the GNU General Public License
@ along with this program. If not, see <http://www.gnu.org/licenses/>.
@
@ Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
@ reasonable legal notices or author attributions in that material or in the Appropriate Legal
@ Notices displayed by works containing it.
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.arm
.section .text.start
.align 4
.global _start
_start:
ldr sp, =__stack_top__
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b main
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.text
.balign 4
.global disableMpuAndJumpToEntrypoints
.type disableMpuAndJumpToEntrypoints, %function
disableMpuAndJumpToEntrypoints:
mov r4, r0
mov r5, r1
mov r6, r2
mov r7, r3
bl flushCaches
@ Disable caches / MPU
mrc p15, 0, r0, c1, c0, 0 @ read control register
bic r0, #(1<<12) @ - instruction cache disable
bic r0, #(1<<2) @ - data cache disable
bic r0, #(1<<0) @ - mpu disable
mcr p15, 0, r0, c1, c0, 0 @ write control register
@ Set the ARM11 entrypoint
mov r0, #0x20000000
str r7, [r0, #-4]
@ Jump to the ARM9 entrypoint
mov r0, r4
mov r1, r5
ldr r2, =0xBEEF
bx r6