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Implement CpuSet

This commit is contained in:
Jeffrey Pfau 2013-04-14 13:36:32 -07:00
parent 90e2443ccd
commit 4e66d7f832
3 changed files with 58 additions and 10 deletions
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48
src/gba/gba-bios.c
View File

@ -1,9 +1,57 @@
#include "gba-bios.h"
#include "gba.h"
#include "gba-memory.h"
static void _CpuSet(struct GBA* gba) {
uint32_t source = gba->cpu.gprs[0];
uint32_t dest = gba->cpu.gprs[1];
uint32_t mode = gba->cpu.gprs[2];
int count = mode & 0x000FFFFF;
int fill = mode & 0x01000000;
int wordsize = (mode & 0x04000000) ? 4 : 2;
int i;
if (fill) {
if (wordsize == 4) {
source &= 0xFFFFFFFC;
dest &= 0xFFFFFFFC;
int32_t word = GBALoad32(&gba->memory.d, source);
for (i = 0; i < count; ++i) {
GBAStore32(&gba->memory.d, dest + (i << 2), word);
}
} else {
source &= 0xFFFFFFFE;
dest &= 0xFFFFFFFE;
uint16_t word = GBALoad16(&gba->memory.d, source);
for (i = 0; i < count; ++i) {
GBAStore16(&gba->memory.d, dest + (i << 1), word);
}
}
} else {
if (wordsize == 4) {
source &= 0xFFFFFFFC;
dest &= 0xFFFFFFFC;
for (i = 0; i < count; ++i) {
int32_t word = GBALoad32(&gba->memory.d, source + (i << 2));
GBAStore32(&gba->memory.d, dest + (i << 2), word);
}
} else {
source &= 0xFFFFFFFE;
dest &= 0xFFFFFFFE;
for (i = 0; i < count; ++i) {
uint16_t word = GBALoad16(&gba->memory.d, source + (i << 1));
GBAStore16(&gba->memory.d, dest + (i << 1), word);
}
}
}
}
void GBASwi16(struct ARMBoard* board, int immediate) {
struct GBA* gba = ((struct GBABoard*) board)->p;
switch (immediate) {
case 0xB:
_CpuSet(gba);
break;
default:
GBALog(GBA_LOG_STUB, "Stub software interrupt: %02x", immediate);
}

10
src/gba/gba-memory.c
View File

@ -7,16 +7,6 @@
static const char* GBA_CANNOT_MMAP = "Could not map memory";
static int32_t GBALoad32(struct ARMMemory* memory, uint32_t address);
static int16_t GBALoad16(struct ARMMemory* memory, uint32_t address);
static uint16_t GBALoadU16(struct ARMMemory* memory, uint32_t address);
static int8_t GBALoad8(struct ARMMemory* memory, uint32_t address);
static uint8_t GBALoadU8(struct ARMMemory* memory, uint32_t address);
static void GBAStore32(struct ARMMemory* memory, uint32_t address, int32_t value);
static void GBAStore16(struct ARMMemory* memory, uint32_t address, int16_t value);
static void GBAStore8(struct ARMMemory* memory, uint32_t address, int8_t value);
static void GBASetActiveRegion(struct ARMMemory* memory, uint32_t region);
void GBAMemoryInit(struct GBAMemory* memory) {

10
src/gba/gba-memory.h
View File

@ -69,4 +69,14 @@ struct GBAMemory {
uint16_t io[SIZE_IO >> 1];
};
int32_t GBALoad32(struct ARMMemory* memory, uint32_t address);
int16_t GBALoad16(struct ARMMemory* memory, uint32_t address);
uint16_t GBALoadU16(struct ARMMemory* memory, uint32_t address);
int8_t GBALoad8(struct ARMMemory* memory, uint32_t address);
uint8_t GBALoadU8(struct ARMMemory* memory, uint32_t address);
void GBAStore32(struct ARMMemory* memory, uint32_t address, int32_t value);
void GBAStore16(struct ARMMemory* memory, uint32_t address, int16_t value);
void GBAStore8(struct ARMMemory* memory, uint32_t address, int8_t value);
#endif