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gpgx: port other changes from the old branch

This commit is contained in:
nattthebear 2017-06-22 17:44:23 -04:00
parent e231cd5084
commit 21c70d1d65
5 changed files with 2497 additions and 2441 deletions
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output/dll/gpgx.wbx.gz
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1446
waterbox/gpgx/cinterface/cinterface.c
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70
waterbox/gpgx/core/cart_hw/md_cart.c
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@ -940,23 +940,59 @@ static void mapper_sf001_w(uint32 address, uint32 data)
*/ */
static void mapper_sf002_w(uint32 address, uint32 data) static void mapper_sf002_w(uint32 address, uint32 data)
{ {
int i; /* 8 x 512k banks */
if (data & 0x80) address = (address << 2) & 0x38;
{
/* $000000-$1BFFFF mapped to $200000-$3BFFFF */ /* bank 0 remains unchanged */
for (i=0x20; i<0x3C; i++) if (address)
{ {
m68k.memory_map[i].base = cart.rom + ((i & 0x1F) << 16); uint32 i;
} uint8 *src = cart.rom + (data << 19);
}
else for (i = 0; i<8; i++)
{ {
/* $200000-$3BFFFF mapped to $200000-$3BFFFF */ m68k.memory_map[address++].base = src + (i << 16);
for (i=0x20; i<0x3C; i++) }
{ }
m68k.memory_map[i].base = cart.rom + (i << 16); else // emulate turning on SRAM
} {
} if (data & 1)
{
if (sram.on)
{
/* Backup RAM mapped to $200000-$20ffff (normally mirrored up to $3fffff but this breaks Sonic Megamix and no game need it) */
cart.hw.bankshift = m68k.memory_map[0x20].base;
m68k.memory_map[0x20].base = sram.sram;
m68k.memory_map[0x20].read8 = sram_read_byte;
m68k.memory_map[0x20].read16 = sram_read_word;
zbank_memory_map[0x20].read = sram_read_byte;
/* Backup RAM write protection */
if (data & 2)
{
m68k.memory_map[0x20].write8 = m68k_unused_8_w;
m68k.memory_map[0x20].write16 = m68k_unused_16_w;
zbank_memory_map[0x20].write = zbank_unused_w;
}
else
{
m68k.memory_map[0x20].write8 = sram_write_byte;
m68k.memory_map[0x20].write16 = sram_write_word;
zbank_memory_map[0x20].write = sram_write_byte;
}
}
}
else
{
// automatically turn off writing to SRAM if SRAM is not visible
m68k.memory_map[0x20].write8 = m68k_unused_8_w;
m68k.memory_map[0x20].write16 = m68k_unused_16_w;
zbank_memory_map[0x20].write = zbank_unused_w;
// put the ROM data back in the memory map
m68k.memory_map[0x20].base = cart.hw.bankshift;
}
}
} }
/* /*

523
waterbox/gpgx/core/cart_hw/sram.c
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@ -1,255 +1,268 @@
/*************************************************************************************** /***************************************************************************************
* Genesis Plus * Genesis Plus
* Backup RAM support * Backup RAM support
* *
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met:
* *
* - Redistributions may not be sold, nor may they be used in a commercial * - Redistributions may not be sold, nor may they be used in a commercial
* product or activity. * product or activity.
* *
* - Redistributions that are modified from the original source must include the * - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a * complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the * binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed * source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel, * (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that * and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable. * component itself accompanies the executable.
* *
* - Redistributions must reproduce the above copyright notice, this list of * - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other * conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution. * materials provided with the distribution.
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. * POSSIBILITY OF SUCH DAMAGE.
* *
****************************************************************************************/ ****************************************************************************************/
#include "shared.h" #include "shared.h"
#include "eeprom_i2c.h" #include "eeprom_i2c.h"
#include "eeprom_spi.h" #include "eeprom_spi.h"
#include "eeprom_93c.h" #include "eeprom_93c.h"
T_SRAM sram; T_SRAM sram;
/**************************************************************************** /****************************************************************************
* A quick guide to external RAM on the Genesis * A quick guide to external RAM on the Genesis
* *
* The external RAM definition is held at offset 0x1b0 of the ROM header. * The external RAM definition is held at offset 0x1b0 of the ROM header.
* *
* 1B0h: dc.b 'RA', %1x1yz000, %abc00000 * 1B0h: dc.b 'RA', %1x1yz000, %abc00000
* 1B4h: dc.l RAM start address * 1B4h: dc.l RAM start address
* 1B8h: dc.l RAM end address * 1B8h: dc.l RAM end address
* x 1 for BACKUP (not volatile), 0 for volatile RAM * x 1 for BACKUP (not volatile), 0 for volatile RAM
* yz 10 if even address only * yz 10 if even address only
* 11 if odd address only * 11 if odd address only
* 00 if both even and odd address * 00 if both even and odd address
* 01 others (serial EEPROM, RAM with 4-bit data bus, etc) * 01 others (serial EEPROM, RAM with 4-bit data bus, etc)
* abc 001 if SRAM * abc 001 if SRAM
* 010 if EEPROM (serial or parallel) * 010 if EEPROM (serial or parallel)
* other values unused * other values unused
* *
* Assuming max. 64k backup RAM throughout * Assuming max. 64k backup RAM throughout
****************************************************************************/ ****************************************************************************/
void sram_init() void sram_init()
{ {
memset(&sram, 0, sizeof (T_SRAM)); memset(&sram, 0, sizeof (T_SRAM));
/* backup RAM data is stored above cartridge ROM area, at $800000-$80FFFF (max. 64K) */ /* backup RAM data is stored above cartridge ROM area, at $800000-$80FFFF (max. 64K) */
if (cart.romsize > 0x800000) return; if (cart.romsize > 0x800000) return;
sram.sram = malloc(0x10000); sram.sram = malloc(0x10000);
/* initialize Backup RAM */ /* initialize Backup RAM */
memset(sram.sram, 0xFF, 0x10000); memset(sram.sram, 0xFF, 0x10000);
//sram.crc = crc32(0, sram.sram, 0x10000); //sram.crc = crc32(0, sram.sram, 0x10000);
/* retrieve informations from header */ /* retrieve informations from header */
if ((READ_BYTE(cart.rom,0x1b0) == 0x52) && (READ_BYTE(cart.rom,0x1b1) == 0x41)) if ((READ_BYTE(cart.rom,0x1b0) == 0x52) && (READ_BYTE(cart.rom,0x1b1) == 0x41))
{ {
/* backup RAM detected */ /* backup RAM detected */
sram.detected = 1; sram.detected = 1;
/* enable backup RAM */ /* enable backup RAM */
sram.on = 1; sram.on = 1;
/* retrieve backup RAM start & end addresses */ /* retrieve backup RAM start & end addresses */
sram.start = READ_WORD_LONG(cart.rom, 0x1b4); sram.start = READ_WORD_LONG(cart.rom, 0x1b4);
sram.end = READ_WORD_LONG(cart.rom, 0x1b8); sram.end = READ_WORD_LONG(cart.rom, 0x1b8);
/* autodetect games with wrong header infos */ /* autodetect games with wrong header infos */
if (strstr(rominfo.product,"T-26013") != NULL) if (strstr(rominfo.product,"T-26013") != NULL)
{ {
/* Psy-O-Blade (wrong header) */ /* Psy-O-Blade (wrong header) */
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x203fff; sram.end = 0x203fff;
} }
/* fixe games indicating internal RAM as volatile external RAM (Feng Kuang Tao Hua Yuan) */ /* fixe games indicating internal RAM as volatile external RAM (Feng Kuang Tao Hua Yuan) */
else if (sram.start == 0xff0000) else if (sram.start == 0xff0000)
{ {
/* backup RAM should be disabled */ /* backup RAM should be disabled */
sram.on = 0; sram.on = 0;
} }
/* fixe other bad header informations */ /* fixe other bad header informations */
else if ((sram.start > sram.end) || ((sram.end - sram.start) >= 0x10000)) else if ((sram.start > sram.end) || ((sram.end - sram.start) >= 0x10000))
{ {
sram.end = sram.start + 0xffff; sram.end = sram.start + 0xffff;
} }
} }
else else
{ {
/* autodetect games with missing header infos */ /* autodetect games with missing header infos */
if (strstr(rominfo.product,"T-50086") != NULL) if (strstr(rominfo.product,"T-50086") != NULL)
{ {
/* PGA Tour Golf */ /* PGA Tour Golf */
sram.on = 1; sram.on = 1;
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x203fff; sram.end = 0x203fff;
} }
else if (strstr(rominfo.product,"ACLD007") != NULL) else if (strstr(rominfo.product,"ACLD007") != NULL)
{ {
/* Winter Challenge */ /* Winter Challenge */
sram.on = 1; sram.on = 1;
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x200fff; sram.end = 0x200fff;
} }
else if (strstr(rominfo.product,"T-50286") != NULL) else if (strstr(rominfo.product,"T-50286") != NULL)
{ {
/* Buck Rogers - Countdown to Doomsday */ /* Buck Rogers - Countdown to Doomsday */
sram.on = 1; sram.on = 1;
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x203fff; sram.end = 0x203fff;
} }
else if (((rominfo.realchecksum == 0xaeaa) || (rominfo.realchecksum == 0x8dba)) && else if (((rominfo.realchecksum == 0xaeaa) || (rominfo.realchecksum == 0x8dba)) &&
(rominfo.checksum == 0x8104)) (rominfo.checksum == 0x8104))
{ {
/* Xin Qigai Wangzi (use uncommon area) */ /* Xin Qigai Wangzi (use uncommon area) */
sram.on = 1; sram.on = 1;
sram.start = 0x400001; sram.start = 0x400001;
sram.end = 0x40ffff; sram.end = 0x40ffff;
} }
else if ((strstr(rominfo.ROMType,"SF") != NULL) && (strstr(rominfo.product,"001") != NULL)) else if ((strstr(rominfo.ROMType,"SF") != NULL) && (strstr(rominfo.product,"001") != NULL))
{ {
/* SF-001 */ /* SF-001 */
sram.on = 1; sram.on = 1;
if (rominfo.checksum == 0x3e08) if (rominfo.checksum == 0x3e08)
{ {
/* last revision (use bankswitching) */ /* last revision (use bankswitching) */
sram.start = 0x3c0001; sram.start = 0x3c0001;
sram.end = 0x3cffff; sram.end = 0x3cffff;
} }
else else
{ {
/* older revisions (use uncommon area) */ /* older revisions (use uncommon area) */
sram.start = 0x400001; sram.start = 0x400001;
sram.end = 0x40ffff; sram.end = 0x40ffff;
} }
} }
else if ((strstr(rominfo.ROMType,"SF") != NULL) && (strstr(rominfo.product,"004") != NULL)) else if ((strstr(rominfo.ROMType,"SF") != NULL) && (strstr(rominfo.product,"004") != NULL))
{ {
/* SF-004 (use bankswitching) */ /* SF-004 (use bankswitching) */
sram.on = 1; sram.on = 1;
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x203fff; sram.end = 0x203fff;
} }
else if (strstr(rominfo.international,"SONIC & KNUCKLES") != NULL) else if (strstr(rominfo.international,"SONIC & KNUCKLES") != NULL)
{ {
/* Sonic 3 & Knuckles combined ROM */ /* Sonic 3 & Knuckles combined ROM */
if (cart.romsize == 0x400000) if (cart.romsize == 0x400000)
{ {
/* Sonic & Knuckle does not have backup RAM but can access FRAM from Sonic 3 cartridge */ /* Sonic & Knuckle does not have backup RAM but can access FRAM from Sonic 3 cartridge */
sram.on = 1; sram.on = 1;
sram.start = 0x200001; sram.start = 0x200001;
sram.end = 0x203fff; sram.end = 0x203fff;
} }
} }
else if (strstr(rominfo.product, "T-50166") != NULL)
/* auto-detect games which need disabled backup RAM */ {
else if (strstr(rominfo.product,"T-113016") != NULL) /* Might and Magic Gates to Another World */
{ sram.on = 1;
/* Pugsy (does not have backup RAM but tries writing outside ROM area as copy protection) */ sram.start = 0x200001;
sram.on = 0; sram.end = 0x203fff;
} }
else if (strstr(rominfo.international,"SONIC THE HEDGEHOG 2") != NULL) else if (strstr(rominfo.international, "MIGHT & MAGIC III") != NULL)
{ {
/* Sonic the Hedgehog 2 (does not have backup RAM) */ /* Might and Magic III - Isles of Terra (USA) (Proto) */
/* this prevents backup RAM from being mapped in place of mirrored ROM when using S&K LOCK-ON feature */ sram.on = 1;
sram.on = 0; sram.start = 0x200001;
} sram.end = 0x203fff;
}
// by default, enable backup RAM for ROM smaller than 2MB /* auto-detect games which need disabled backup RAM */
/* else if (strstr(rominfo.product,"T-113016") != NULL)
else if (cart.romsize <= 0x200000) {
{ /* Pugsy (does not have backup RAM but tries writing outside ROM area as copy protection) */
// 64KB static RAM mapped to $200000-$20ffff sram.on = 0;
sram.start = 0x200000; }
sram.end = 0x20ffff; else if (strstr(rominfo.international,"SONIC THE HEDGEHOG 2") != NULL)
sram.on = 1; {
} /* Sonic the Hedgehog 2 (does not have backup RAM) */
*/ /* this prevents backup RAM from being mapped in place of mirrored ROM when using S&K LOCK-ON feature */
} sram.on = 0;
} }
unsigned int sram_read_byte(unsigned int address) // by default, enable backup RAM for ROM smaller than 2MB
{ /*
return sram.sram[address & 0xffff]; else if (cart.romsize <= 0x200000)
} {
// 64KB static RAM mapped to $200000-$20ffff
unsigned int sram_read_word(unsigned int address) sram.start = 0x200000;
{ sram.end = 0x20ffff;
address &= 0xfffe; sram.on = 1;
return (sram.sram[address + 1] | (sram.sram[address] << 8)); }
} */
}
void sram_write_byte(unsigned int address, unsigned int data) }
{
sram.sram[address & 0xffff] = data; unsigned int sram_read_byte(unsigned int address)
} {
return sram.sram[address & 0xffff];
void sram_write_word(unsigned int address, unsigned int data) }
{
address &= 0xfffe; unsigned int sram_read_word(unsigned int address)
sram.sram[address] = data >> 8; {
sram.sram[address + 1] = data & 0xff; address &= 0xfffe;
} return (sram.sram[address + 1] | (sram.sram[address] << 8));
}
// the variables in SRAM_T are all part of "configuration", so we don't have to save those.
// the only thing that needs to be saved is the SRAM itself and the SEEPROM struct (if applicable) void sram_write_byte(unsigned int address, unsigned int data)
{
int sram_get_actual_size() sram.sram[address & 0xffff] = data;
{ }
if (!sram.on)
return 0; void sram_write_word(unsigned int address, unsigned int data)
switch (sram.custom) {
{ address &= 0xfffe;
case 0: // plain bus access saveram sram.sram[address] = data >> 8;
break; sram.sram[address + 1] = data & 0xff;
case 1: // i2c }
return eeprom_i2c.config.size_mask + 1;
case 2: // spi // the variables in SRAM_T are all part of "configuration", so we don't have to save those.
return 0x10000; // it doesn't appear to mask anything internally // the only thing that needs to be saved is the SRAM itself and the SEEPROM struct (if applicable)
case 3: // 93c
return 0x10000; // SMS only and i don't have time to look into it int sram_get_actual_size()
default: {
return 0x10000; // who knows if (!sram.on)
} return 0;
// figure size for plain bus access saverams switch (sram.custom)
{ {
int startaddr = sram.start / 8192; case 0: // plain bus access saveram
int endaddr = sram.end / 8192 + 1; break;
int size = (endaddr - startaddr) * 8192; case 1: // i2c
return size; return eeprom_i2c.config.size_mask + 1;
} case 2: // spi
} return 0x10000; // it doesn't appear to mask anything internally
case 3: // 93c
return 0x10000; // SMS only and i don't have time to look into it
default:
return 0x10000; // who knows
}
// figure size for plain bus access saverams
{
int startaddr = sram.start / 8192;
int endaddr = sram.end / 8192 + 1;
int size = (endaddr - startaddr) * 8192;
return size;
}
}

2899
waterbox/gpgx/core/m68k/m68kcpu.h
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