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Rotate LDR

This commit is contained in:
Jeffrey Pfau 2013-04-28 01:33:59 -07:00
parent 6450ce16b2
commit 8072ff7d2c
1 changed files with 19 additions and 7 deletions
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26
src/gba/gba-memory.c
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@ -107,20 +107,26 @@ static void GBASetActiveRegion(struct ARMMemory* memory, uint32_t address) {
int32_t GBALoad32(struct ARMMemory* memory, uint32_t address) {
struct GBAMemory* gbaMemory = (struct GBAMemory*) memory;
uint32_t value = 0;
switch (address & ~OFFSET_MASK) {
case BASE_BIOS:
break;
case BASE_WORKING_RAM:
return gbaMemory->wram[(address & (SIZE_WORKING_RAM - 1)) >> 2];
value = gbaMemory->wram[(address & (SIZE_WORKING_RAM - 1)) >> 2];
break;
case BASE_WORKING_IRAM:
return gbaMemory->iwram[(address & (SIZE_WORKING_IRAM - 1)) >> 2];
value = gbaMemory->iwram[(address & (SIZE_WORKING_IRAM - 1)) >> 2];
break;
case BASE_IO:
return GBAIORead(gbaMemory->p, address & (SIZE_IO - 1)) | (GBAIORead(gbaMemory->p, (address & (SIZE_IO - 1)) | 2) << 16);
value = GBAIORead(gbaMemory->p, address & (SIZE_IO - 1)) | (GBAIORead(gbaMemory->p, (address & (SIZE_IO - 1)) | 2) << 16);
break;
case BASE_PALETTE_RAM:
return ((int32_t*) gbaMemory->p->video.palette)[(address & (SIZE_PALETTE_RAM - 1)) >> 2];
value = ((int32_t*) gbaMemory->p->video.palette)[(address & (SIZE_PALETTE_RAM - 1)) >> 2];
break;
case BASE_VRAM:
return ((int32_t*) gbaMemory->p->video.vram)[(address & 0x0001FFFF) >> 2];
value = ((int32_t*) gbaMemory->p->video.vram)[(address & 0x0001FFFF) >> 2];
break;
case BASE_OAM:
break;
case BASE_CART0:
@ -130,15 +136,21 @@ int32_t GBALoad32(struct ARMMemory* memory, uint32_t address) {
case BASE_CART2:
case BASE_CART2_EX:
if ((address & (SIZE_CART0 - 1)) < gbaMemory->romSize) {
return gbaMemory->rom[(address & (SIZE_CART0 - 1)) >> 2];
value = gbaMemory->rom[(address & (SIZE_CART0 - 1)) >> 2];
}
break;
case BASE_CART_SRAM:
break;
default:
break;
}
return 0;
// Unaligned 32-bit loads are "rotated" so they make some semblance of sense
int rotate = (address & 3) << 3;
if (!rotate) {
return value;
}
return (value >> rotate) | (value << (32 - rotate));
}
int16_t GBALoad16(struct ARMMemory* memory, uint32_t address) {