mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-19 03:25:38 -04:00
33b091861b
Overhaul of old cart loading code courtasy of Robz8. There is however a small regression. This build currently can't boot DS-Xtreme. If you have issues with flashcarts not booting games/homebrew correctly, disable the extended ram option in the ini file. Currently off by default. But it must be on for TWL carts to boot correctly.
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
#include <string.h>
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#include <nds/system.h>
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#include "module_params.h"
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#include "patch.h"
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#include "find.h"
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#include "common.h"
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//#define memcpy __builtin_memcpy // memcpy
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void patchMpu(const tNDSHeader* ndsHeader, const module_params_t* moduleParams) {
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u32 patchMpuRegion = 0;
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u32 patchMpuSize = 0;
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// Find the mpu init
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u32* mpuStartOffset = findMpuStartOffset(ndsHeader, patchMpuRegion);
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u32* mpuDataOffset = findMpuDataOffset(moduleParams, patchMpuRegion, mpuStartOffset);
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if (mpuDataOffset) {
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// Change the region 1 configuration
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u32 mpuInitRegionNewData = PAGE_32M | 0x02000000 | 1;
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u32 mpuNewDataAccess = 0;
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u32 mpuNewInstrAccess = 0;
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int mpuAccessOffset = 0;
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switch (patchMpuRegion) {
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case 0:
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mpuInitRegionNewData = PAGE_128M | 0x00000000 | 1;
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break;
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case 2:
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mpuNewDataAccess = 0x15111111;
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mpuNewInstrAccess = 0x5111111;
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mpuAccessOffset = 6;
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break;
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case 3:
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mpuInitRegionNewData = PAGE_8M | 0x03000000 | 1;
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mpuNewInstrAccess = 0x5111111;
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mpuAccessOffset = 5;
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break;
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}
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*mpuDataOffset = mpuInitRegionNewData;
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if (mpuAccessOffset) {
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if (mpuNewInstrAccess) {
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mpuDataOffset[mpuAccessOffset] = mpuNewInstrAccess;
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}
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if (mpuNewDataAccess) {
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mpuDataOffset[mpuAccessOffset + 1] = mpuNewDataAccess;
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}
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}
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}
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// Find the mpu cache init
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u32* mpuInitCacheOffset = findMpuInitCacheOffset(mpuStartOffset);
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if (mpuInitCacheOffset) {
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*mpuInitCacheOffset = 0xE3A00046;
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}
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// Patch out all further mpu reconfiguration
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// dbg_printf("patchMpuSize: ");
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// dbg_hexa(patchMpuSize);
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// dbg_printf("\n\n");
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const u32* mpuInitRegionSignature = getMpuInitRegionSignature(patchMpuRegion);
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u32* mpuInitOffset = mpuStartOffset;
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while (mpuInitOffset && patchMpuSize) {
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u32 patchSize = ndsHeader->arm9binarySize;
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if (patchMpuSize > 1) {
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patchSize = patchMpuSize;
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}
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mpuInitOffset = findOffset(
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//(u32*)((u32)mpuStartOffset + 4), patchSize,
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mpuInitOffset + 1, patchSize,
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mpuInitRegionSignature, 1
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);
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if (mpuInitOffset) {
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// dbg_printf("Mpu init: ");
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// dbg_hexa((u32)mpuInitOffset);
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// dbg_printf("\n\n");
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*mpuInitOffset = 0xE1A00000; // nop
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// Try to find it
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/*for (int i = 0; i < 0x100; i++) {
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mpuDataOffset += i;
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if ((*mpuDataOffset & 0xFFFFFF00) == 0x02000000) {
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*mpuDataOffset = PAGE_32M | 0x02000000 | 1;
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break;
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}
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if (i == 100) {
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*mpuStartOffset = 0xE1A00000;
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}
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}*/
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}
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}
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}
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