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GBA: Improve I/O handling

This commit is contained in:
Jeffrey Pfau 2015-11-10 22:45:09 -08:00
parent 7735c08fd5
commit ff4950c50d
1 changed files with 46 additions and 4 deletions
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50
src/gba/io.c
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@ -239,7 +239,48 @@ static const int _isValidRegister[REG_MAX >> 1] = {
1, 1, 1, 0, 1
};
static const int _isSpecialRegister[REG_MAX >> 1] = {
static const int _isRSpecialRegister[REG_MAX >> 1] = {
// Video
0, 0, 1, 1, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
// Audio
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 0, 0, 0, 0,
// DMA
0, 0, 0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0, 0, 0,
0, 1, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
// Timers
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
// SIO
1, 1, 1, 1, 1, 0, 0, 0,
1, 1, 1, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
// Interrupts
};
static const int _isWSpecialRegister[REG_MAX >> 1] = {
// Video
0, 0, 1, 1, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
@ -667,6 +708,7 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
case REG_MOSAIC:
case REG_BLDY:
// Write-only register
GBALog(gba, GBA_LOG_GAME_ERROR, "Read from write-only I/O register: %03X", address);
return GBALoad16(gba->cpu, 0x01000000, 0); // Simulate a bad load
case REG_DISPCNT:
case REG_DISPSTAT:
@ -713,7 +755,7 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
GBALog(gba, GBA_LOG_STUB, "Stub I/O register read: %03x", address);
if (address >= REG_MAX) {
GBALog(gba, GBA_LOG_GAME_ERROR, "Read from unused I/O register: %03X", address);
return 0; // TODO: Reuse LOAD_BAD
return GBALoad16(gba->cpu, 0x01000000, 0);
}
break;
}
@ -723,7 +765,7 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
void GBAIOSerialize(struct GBA* gba, struct GBASerializedState* state) {
int i;
for (i = 0; i < REG_MAX; i += 2) {
if (_isSpecialRegister[i >> 1]) {
if (_isRSpecialRegister[i >> 1]) {
STORE_16(gba->memory.io[i >> 1], i, state->io);
} else if (_isValidRegister[i >> 1]) {
uint16_t reg = GBAIORead(gba, i);
@ -751,7 +793,7 @@ void GBAIOSerialize(struct GBA* gba, struct GBASerializedState* state) {
void GBAIODeserialize(struct GBA* gba, const struct GBASerializedState* state) {
int i;
for (i = 0; i < REG_MAX; i += 2) {
if (_isSpecialRegister[i >> 1]) {
if (_isWSpecialRegister[i >> 1]) {
LOAD_16(gba->memory.io[i >> 1], i, state->io);
} else if (_isValidRegister[i >> 1]) {
uint16_t reg;