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RTC support

This commit is contained in:
Lior Halphon 2021-03-25 00:04:47 +02:00
parent a52302f2f6
commit 659f954028
1 changed files with 60 additions and 3 deletions
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63
Core/save_state.c
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@ -70,6 +70,24 @@ typedef struct __attribute__((packed)) {
uint8_t sprite_palettes[0x40];
} BESS_PALS_t;
/* Same RTC format as used by VBA, BGB and SameBoy in battery saves*/
typedef struct __attribute__((packed)){
BESS_block_t header;
struct {
uint8_t seconds;
uint8_t padding1[3];
uint8_t minutes;
uint8_t padding2[3];
uint8_t hours;
uint8_t padding3[3];
uint8_t days;
uint8_t padding4[3];
uint8_t high;
uint8_t padding5[3];
} real, latched;
uint64_t last_rtc_second;
} BESS_RTC_t;
typedef struct __attribute__((packed)) {
uint16_t address;
uint8_t value;
@ -79,9 +97,11 @@ typedef struct __attribute__((packed)) {
#ifdef GB_BIG_ENDIAN
#define BESS16(x) __builtin_bswap16(x)
#define BESS32(x) __builtin_bswap32(x)
#define BESS64(x) __builtin_bswap64(x)
#else
#define BESS16(x) (x)
#define BESS32(x) (x)
#define BESS64(x) (x)
#endif
typedef struct virtual_file_s virtual_file_t;
@ -181,7 +201,7 @@ static size_t bess_size_for_cartridge(const GB_cartridge_t *cart)
case GB_MBC2:
return sizeof(BESS_block_t) + 2 * sizeof(BESS_MBC_pair_t);
case GB_MBC3:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t) + (cart->has_rtc? sizeof(BESS_RTC_t) : 0);
case GB_MBC5:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
case GB_HUC1:
@ -212,7 +232,7 @@ size_t GB_get_save_state_size(GB_gameboy_t *gb)
+ sizeof(BESS_NAME) - 1
+ sizeof(BESS_OAM_t)
+ (GB_is_cgb(gb)? sizeof(BESS_PALS_t) : 0)
+ bess_size_for_cartridge(gb->cartridge_type) // MBC block
+ bess_size_for_cartridge(gb->cartridge_type) // MBC & RTC block
+ sizeof(BESS_block_t) // END block
+ sizeof(BESS_footer_t);
}
@ -497,6 +517,24 @@ static int save_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
}
save_bess_mbc_block(gb, file);
if (gb->cartridge_type->has_rtc && gb->cartridge_type->mbc_type == GB_MBC3) {
BESS_RTC_t bess_rtc = {0,};
bess_rtc.header = (BESS_block_t){htonl('RTC '), BESS32(sizeof(bess_rtc) - sizeof(bess_rtc.header))};
bess_rtc.real.seconds = gb->rtc_real.seconds;
bess_rtc.real.minutes = gb->rtc_real.minutes;
bess_rtc.real.hours = gb->rtc_real.hours;
bess_rtc.real.days = gb->rtc_real.days;
bess_rtc.real.high = gb->rtc_real.high;
bess_rtc.latched.seconds = gb->rtc_latched.seconds;
bess_rtc.latched.minutes = gb->rtc_latched.minutes;
bess_rtc.latched.hours = gb->rtc_latched.hours;
bess_rtc.latched.days = gb->rtc_latched.days;
bess_rtc.latched.high = gb->rtc_latched.high;
bess_rtc.last_rtc_second = BESS64(gb->last_rtc_second);
if (file->write(file, &bess_rtc, sizeof(bess_rtc)) != sizeof(bess_rtc)) {
goto error;
}
}
if (GB_is_cgb(gb)) {
/* BESS PALS */
@ -621,7 +659,7 @@ static int load_bess_save(GB_gameboy_t *gb, virtual_file_t *file, bool is_samebo
file->seek(file, BESS32(footer.start_offset), SEEK_SET);
bool found_core = false;
BESS_CORE_t core;
BESS_CORE_t core = {0,};
while (true) {
BESS_block_t block;
if (file->read(file, &block, sizeof(block)) != sizeof(block)) goto error;
@ -774,6 +812,25 @@ static int load_bess_save(GB_gameboy_t *gb, virtual_file_t *file, bool is_samebo
GB_write_memory(&save, BESS16(pair.address), pair.value);
}
break;
case htonl('RTC '):
if (!found_core) goto parse_error;
BESS_RTC_t bess_rtc;
if (BESS32(block.size) != sizeof(bess_rtc) - sizeof(block)) goto parse_error;
if (gb->cartridge_type->has_rtc && gb->cartridge_type->mbc_type == GB_MBC3) {
if (file->read(file, &bess_rtc.header + 1, BESS32(block.size)) != BESS32(block.size)) goto error;
gb->rtc_real.seconds = bess_rtc.real.seconds;
gb->rtc_real.minutes = bess_rtc.real.minutes;
gb->rtc_real.hours = bess_rtc.real.hours;
gb->rtc_real.days = bess_rtc.real.days;
gb->rtc_real.high = bess_rtc.real.high;
gb->rtc_latched.seconds = bess_rtc.latched.seconds;
gb->rtc_latched.minutes = bess_rtc.latched.minutes;
gb->rtc_latched.hours = bess_rtc.latched.hours;
gb->rtc_latched.days = bess_rtc.latched.days;
gb->rtc_latched.high = bess_rtc.latched.high;
gb->last_rtc_second = BESS64(bess_rtc.last_rtc_second);
}
break;
case htonl('END '):
if (!found_core) goto parse_error;
if (BESS32(block.size) != 0) goto parse_error;