mirror of
https://github.com/ApacheThunder/GBA-Exploader.git
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4ec14bae55
* Soft Reset for Rumble Menu fixed. New scheme is now used for loading SoftReset.xxxx. Now instead it will look for R4TF.nds (R4TF = 4 character ioType code for DLDI user is currently using with R4TF as an example). If not found it will look for a few specific NDS files to try. If those aren't found it will try boot.nds. If boot.nds isn't found then rumble menu will not be available.
111 lines
3.4 KiB
ArmAsm
111 lines
3.4 KiB
ArmAsm
/*
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Copyright 2006 - 2015 Dave Murphy (WinterMute)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <nds/arm9/cache_asm.h>
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.text
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.align 4
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.arm
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.arch armv5te
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.cpu arm946e-s
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@---------------------------------------------------------------------------------
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.global _start
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.type _start STT_FUNC
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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@ Switch off MPU
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #PROTECT_ENABLE
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mcr p15, 0, r0, c1, c0, 0
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adr r12, mpu_initial_data
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ldmia r12, {r0-r10}
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mcr p15, 0, r0, c2, c0, 0
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mcr p15, 0, r0, c2, c0, 1
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mcr p15, 0, r1, c3, c0, 0
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mcr p15, 0, r2, c5, c0, 2
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mcr p15, 0, r3, c5, c0, 3
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mcr p15, 0, r4, c6, c0, 0
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mcr p15, 0, r5, c6, c1, 0
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mcr p15, 0, r6, c6, c3, 0
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mcr p15, 0, r7, c6, c4, 0
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mcr p15, 0, r8, c6, c6, 0
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mcr p15, 0, r9, c6, c7, 0
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mcr p15, 0, r10, c9, c1, 0
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mov r0, #0
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mcr p15, 0, r0, c6, c2, 0 @ PU Protection Unit Data/Unified Region 2
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mcr p15, 0, r0, c6, c5, 0 @ PU Protection Unit Data/Unified Region 5
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mrc p15, 0, r0, c9, c1, 0 @ DTCM
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mov r0, r0, lsr #12 @ base
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mov r0, r0, lsl #12 @ size
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add r0, r0, #0x4000 @ dtcm top
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sub r0, r0, #4 @ irq vector
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mov r1, #0
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str r1, [r0]
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sub r0, r0, #4 @ IRQ1 Check Bits
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str r1, [r0]
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sub r0, r0, #128
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bic r0, r0, #7
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msr cpsr_c, #0xd3 @ svc mode
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mov sp, r0
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sub r0, r0, #128
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msr cpsr_c, #0xd2 @ irq mode
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mov sp, r0
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sub r0, r0, #128
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msr cpsr_c, #0xdf @ system mode
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mov sp, r0
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@ enable cache & tcm
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mrc p15, 0, r0, c1, c0, 0
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ldr r1,= ITCM_ENABLE | DTCM_ENABLE | ICACHE_ENABLE | DCACHE_ENABLE
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orr r0,r0,r1
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mcr p15, 0, r0, c1, c0, 0
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ldr r10, =0x2FFFE04
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ldr r0, =0xE59FF018
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str r0, [r10]
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add r1, r10, #0x20
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str r10, [r1]
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bx r10
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.pool
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mpu_initial_data:
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.word 0x00000042 @ p15,0,c2,c0,0..1,r0 ;PU Cachability Bits for Data/Unified+Instruction Protection Region
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.word 0x00000002 @ p15,0,c3,c0,0,r1 ;PU Write-Bufferability Bits for Data Protection Regions
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.word 0x15111011 @ p15,0,c5,c0,2,r2 ;PU Extended Access Permission Data/Unified Protection Region
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.word 0x05100011 @ p15,0,c5,c0,3,r3 ;PU Extended Access Permission Instruction Protection Region
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.word 0x04000033 @ p15,0,c6,c0,0,r4 ;PU Protection Unit Data/Unified Region 0
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.word 0x0200002b @ p15,0,c6,c1,0,r5 ;PU Protection Unit Data/Unified Region 1 4MB
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.word 0x08000035 @ p15,0,c6,c3,0,r6 ;PU Protection Unit Data/Unified Region 3
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.word 0x0300001b @ p15,0,c6,c4,0,r7 ;PU Protection Unit Data/Unified Region 4
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.word 0xffff001d @ p15,0,c6,c6,0,r8 ;PU Protection Unit Data/Unified Region 6
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.word 0x02fff017 @ p15,0,c6,c7,0,r9 ;PU Protection Unit Data/Unified Region 7 4KB
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.word 0x0300000a @ p15,0,c9,c1,0,r10 ;TCM Data TCM Base and Virtual Size
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