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Genesis GPGX SRAM support for games larger than 8MB (#3139) 

* Large SRAM

Cherry pick changes in order to run games with SRAM support for games larger than 8MB based on the existing commit by ekeeke in Genesis-Plus-GX.

e6ab7563e7

* Revert "Large SRAM"

Removes changes to the cd cart files and contains the newly built  gpgx.wbx.gz.
This commit is contained in:
ShinobiWannabe 2022-02-15 14:25:38 -06:00 committed by GitHub
parent df04bf1f69
commit 05f11be191
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 31 additions and 34 deletions
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BIN
Assets/dll/gpgx.wbx.gz
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Binary file not shown.

8
waterbox/gpgx/core/cart_hw/areplay.c
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@ -64,10 +64,10 @@ void areplay_init(void)
memset(&action_replay,0,sizeof(action_replay));
/* store Action replay ROM (max. 128k) & RAM (64k) above cartridge ROM + SRAM area */
if (cart.romsize > 0x810000) return;
action_replay.rom = cart.rom + 0x810000;
action_replay.ram = cart.rom + 0x830000;
/* store Action replay ROM (max. 128KB) & RAM (64KB) above cartridge ROM (max. 8MB) */
if (cart.romsize > 0x800000) return;
action_replay.rom = cart.rom + 0x800000;
action_replay.ram = cart.rom + 0x820000;
/* Open Action Replay ROM */
f = fopen(AR_ROM,"rb");

6
waterbox/gpgx/core/cart_hw/ggenie.c
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@ -64,9 +64,9 @@ void ggenie_init(void)
memset(&ggenie,0,sizeof(ggenie));
/* Store Game Genie ROM (32k) above cartridge ROM + SRAM area */
if (cart.romsize > 0x810000) return;
ggenie.rom = cart.rom + 0x810000;
/* Store Game Genie ROM (32KB) above cartridge ROM (max. 8MB) */
if (cart.romsize > 0x800000) return;
ggenie.rom = cart.rom + 0x800000;
/* Open Game Genie ROM file */
f = fopen(GG_ROM,"rb");

42
waterbox/gpgx/core/cart_hw/md_cart.c
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@ -473,39 +473,39 @@ void md_cart_init(void)
case TYPE_SK:
{
/* store S&K ROM above cartridge ROM (and before backup memory) */
if (cart.romsize > 0x600000) break;
/* store Sonic & Knuckles ROM files after cartridge ROM area */
if (cart.romsize > 0x400000) break;
/* try to load Sonic & Knuckles ROM file (2 MB) */
if (load_archive(SK_ROM, cart.rom + 0x600000, 0x200000, NULL) == 0x200000)
/* try to load Sonic & Knuckles ROM file (2MB) */
if (load_archive(SK_ROM, cart.rom + 0x400000, 0x200000, NULL) == 0x200000)
{
/* check ROM header */
if (!memcmp(cart.rom + 0x600000 + 0x120, "SONIC & KNUCKLES",16))
if (!memcmp(cart.rom + 0x400000 + 0x120, "SONIC & KNUCKLES",16))
{
/* try to load Sonic 2 & Knuckles UPMEM ROM (256 KB) */
if (load_archive(SK_UPMEM, cart.rom + 0x900000, 0x40000, NULL) == 0x40000)
/* try to load Sonic 2 & Knuckles upmem ROM file (256KB) */
if (load_archive(SK_UPMEM, cart.rom + 0x600000, 0x40000, NULL) == 0x40000)
{
/* $000000-$1FFFFF is mapped to S&K ROM */
for (i=0x00; i<0x20; i++)
{
m68k.memory_map[i].base = cart.rom + 0x600000 + (i << 16);
m68k.memory_map[i].base = cart.rom + 0x400000 + (i << 16);
}
#ifdef LSB_FIRST
for (i=0; i<0x200000; i+=2)
{
/* Byteswap ROM */
uint8 temp = cart.rom[i + 0x600000];
cart.rom[i + 0x600000] = cart.rom[i + 0x600000 + 1];
cart.rom[i + 0x600000 + 1] = temp;
uint8 temp = cart.rom[i + 0x400000];
cart.rom[i + 0x400000] = cart.rom[i + 0x400000 + 1];
cart.rom[i + 0x400000 + 1] = temp;
}
for (i=0; i<0x40000; i+=2)
{
/* Byteswap ROM */
uint8 temp = cart.rom[i + 0x900000];
cart.rom[i + 0x900000] = cart.rom[i + 0x900000 + 1];
cart.rom[i + 0x900000 + 1] = temp;
uint8 temp = cart.rom[i + 0x600000];
cart.rom[i + 0x600000] = cart.rom[i + 0x600000 + 1];
cart.rom[i + 0x600000 + 1] = temp;
}
#endif
cart.special |= HW_LOCK_ON;
@ -564,16 +564,16 @@ void md_cart_init(void)
/* Realtec mapper */
if (cart.hw.realtec)
{
/* 8k BOOT ROM */
/* copy 8KB Boot ROM after cartridge ROM area */
for (i=0; i<8; i++)
{
memcpy(cart.rom + 0x900000 + i*0x2000, cart.rom + 0x7e000, 0x2000);
memcpy(cart.rom + 0x400000 + i*0x2000, cart.rom + 0x7e000, 0x2000);
}
/* BOOT ROM is mapped to $000000-$3FFFFF */
/* Boot ROM (8KB mirrored) is mapped to $000000-$3FFFFF */
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + 0x900000;
m68k.memory_map[i].base = cart.rom + 0x400000;
}
}
@ -845,12 +845,12 @@ static void mapper_sega_w(uint32 data)
}
/* S&K lock-on chip */
if ((cart.special & HW_LOCK_ON) && (config.lock_on == TYPE_SK))
if (cart.special & HW_LOCK_ON)
{
/* S2K upmem chip mapped to $300000-$3fffff (256K mirrored) */
/* S2K upmem chip mapped to $300000-$3fffff (256KB mirrored) */
for (i=0x30; i<0x40; i++)
{
m68k.memory_map[i].base = (cart.rom + 0x900000) + ((i & 3) << 16);
m68k.memory_map[i].base = (cart.rom + 0x600000) + ((i & 3) << 16);
}
}
}

7
waterbox/gpgx/core/cart_hw/sram.c
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@ -66,11 +66,8 @@ extern int cinterface_force_sram;
****************************************************************************/
void sram_init()
{
memset(&sram, 0, sizeof (T_SRAM));
/* backup RAM data is stored above cartridge ROM area, at $800000-$80FFFF (max. 64K) */
if (cart.romsize > 0x800000) return;
sram.sram = malloc(0x10000);
/* disable Backup RAM by default */
sram.detected = sram.on = sram.custom = sram.start = sram.end = 0;
/* initialize Backup RAM */
memset(sram.sram, 0xFF, 0x10000);

2
waterbox/gpgx/core/cart_hw/sram.h
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@ -47,7 +47,7 @@ typedef struct
uint32 start;
uint32 end;
//uint32 crc;
uint8 *sram;
uint8 sram[0x10000];
} T_SRAM;
/* Function prototypes */