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libretro: Update GB's memory map, expose all usuable ram

This commit is contained in:
retro-wertz 2019-01-14 21:39:52 +08:00 committed by Rafael Kitover
parent 470d86f5c8
commit af3fe01822
1 changed files with 36 additions and 53 deletions
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89
src/libretro/libretro.cpp
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@ -427,6 +427,9 @@ void retro_init(void)
if (environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &rgb8888) && log_cb)
log_cb(RETRO_LOG_INFO, "Frontend supports XRGB8888 - will use that instead of XRGB1555.\n");
#endif
bool yes = true;
environ_cb(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
}
static const char *gbGetCartridgeType(void)
@ -1263,68 +1266,48 @@ bool retro_load_game(const struct retro_game_info *game)
gb_init();
struct retro_memory_descriptor desc[8];
unsigned addr, i;
struct retro_memory_descriptor desc[16];
struct retro_memory_map retromap;
memset(desc, 0, sizeof(desc));
// the GB's memory is divided into 16 parts with 4096 bytes each == 65536
for (addr = 0, i = 0; addr < 16; addr++) {
if (gbMemoryMap[addr] != NULL) {
// $FFFF Interrupt Enable Flag
// $FF80-$FFFE Zero Page - 127 bytes
// $FF00-$FF7F Hardware I/O Registers
// $FEA0-$FEFF Unusable Memory
// $FE00-$FE9F OAM - Object Attribute Memory
// $E000-$FDFF Echo RAM - Reserved, Do Not Use
// $D000-$DFFF Internal RAM - Bank 1-7 (switchable - CGB only)
// $C000-$CFFF Internal RAM - Bank 0 (fixed)
// $A000-$BFFF Cartridge RAM (If Available)
// $9C00-$9FFF BG Map Data 2
// $9800-$9BFF BG Map Data 1
// $8000-$97FF Character RAM
// $4000-$7FFF Cartridge ROM - Switchable Banks 1-xx
// $0150-$3FFF Cartridge ROM - Bank 0 (fixed)
// $0100-$014F Cartridge Header Area
// $0000-$00FF Restart and Interrupt Vectors
// http://gameboy.mongenel.com/dmg/asmmemmap.html
// workram bank 0 0xc000-0xcfff / bank 1-7 0xd000-0xdfff
desc[0].ptr = &gbMemory[0xc000];
desc[0].start = 0xc000;
desc[0].len = 0x1000;
// workram bank 1-7 switchable (switchable-CGB only)
desc[1].ptr = gbCgbMode ? &gbWram[0x1000] : &gbMemory[0xd000];
desc[1].start = 0xd000;
desc[1].len = 0x1000;
// high ram area
desc[2].ptr = &gbMemory[0xff80];
desc[2].start = 0xff80;
desc[2].len = 0x0080;
// save ram or cartridge ram area
desc[3].ptr = gbRamSize ? &gbRam[0] : 0;
desc[3].start = 0xa000;
desc[3].len = gbRamSize ? gbRamSize : 0;
// vram (chr ram, gb map data 1 - 2)
desc[4].ptr = gbCgbMode ? &gbVram[0] : &gbMemory[0x8000];
desc[4].start = 0x8000;
desc[4].len = 0x2000;
// oam
desc[5].ptr = &gbMemory[0xfe00];
desc[5].start = 0xfe00;
desc[5].len = 0x00a0;
// http://gameboy.mongenel.com/dmg/asmmemmap.html
// $4000-$7FFF Cartridge ROM - Switchable Banks 1-xx
// $0150-$3FFF Cartridge ROM - Bank 0 (fixed)
// $0100-$014F Cartridge Header Area
// $0000-$00FF Restart and Interrupt Vectors
desc[6].ptr = gbMemoryMap[0x00];
desc[6].start = 0x0000;
desc[6].len = 0x4000;
desc[6].flags = RETRO_MEMDESC_CONST;
desc[7].ptr = gbMemoryMap[0x04];
desc[7].start = 0x4000;
desc[7].len = 0x4000;
desc[7].flags = RETRO_MEMDESC_CONST;
struct retro_memory_map retromap = {
desc,
sizeof(desc) / sizeof(desc[0])
};
desc[i].ptr = gbMemoryMap[addr];
desc[i].start = addr * 0x1000;
desc[i].len = 4096;
if (addr < 4) desc[i].flags = RETRO_MEMDESC_CONST;
i++;
}
}
retromap.descriptors = desc;
retromap.num_descriptors = i;
environ_cb(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &retromap);
}
if (!core)
return false;
bool yes = true;
environ_cb(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
uint8_t* state_buf = (uint8_t*)malloc(2000000);
serialize_size = core->emuWriteState(state_buf, 2000000);
free(state_buf);