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Allow access to Sega CD's extra memory using retro_memory_map

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This commit is contained in:
negativeExponent
2020-01-12 10:18:14 +08:00
parent 844e8aa388
commit 495dddc0ad
1 changed files with 23 additions and 0 deletions
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23
platform/libretro/libretro.c
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@@ -1038,6 +1038,26 @@ static const char *find_bios(int *region, const char *cd_fname)
return NULL;
}
static void set_memory_maps(void)
{
if (PicoIn.AHW & PAHW_MCD)
{
const size_t SCD_BIT = 1ULL << 31ULL;
const uint64_t mem = RETRO_MEMDESC_SYSTEM_RAM;
struct retro_memory_map mmaps;
struct retro_memory_descriptor descs[] = {
{ mem, PicoMem.ram, 0, 0xFF0000, 0, 0, 0x10000, "68KRAM" },
/* virtual address using SCD_BIT so all 512M of prg_ram can be accessed */
/* at address $80020000 */
{ mem, Pico_mcd->prg_ram, 0, SCD_BIT | 0x020000, 0, 0, 0x80000, "PRGRAM" },
};
mmaps.descriptors = descs;
mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
environ_cb(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
}
}
bool retro_load_game(const struct retro_game_info *info)
{
enum media_type_e media_type;
@@ -1156,6 +1176,9 @@ bool retro_load_game(const struct retro_game_info *info)
PicoIn.sndOut = sndBuffer;
PsndRerate(0);
/* Setup retro memory maps */
set_memory_maps();
return true;
}