RaySollium99/picodrive
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picodrive/pico/cart.c

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/*
* PicoDrive
* (c) Copyright Dave, 2004
* (C) notaz, 2006-2010
*
* This work is licensed under the terms of MAME license.
* See COPYING file in the top-level directory.
*/
#include "pico_int.h"
#include <cpu/debug.h>
#if defined(USE_LIBCHDR)
#include "libchdr/chd.h"
#include "libchdr/cdrom.h"
#endif
#include <unzip/unzip.h>
#include <zlib.h>
static int rom_alloc_size;
static const char *rom_exts[] = { "bin", "gen", "smd", "md", "32x", "pco", "iso", "sms", "gg", "sg", "sc" };
void (*PicoCartUnloadHook)(void);
void (*PicoCartMemSetup)(void);
void (*PicoCartLoadProgressCB)(int percent) = NULL;
void (*PicoCDLoadProgressCB)(const char *fname, int percent) = NULL; // handled in Pico/cd/cd_file.c
int PicoGameLoaded;
static void PicoCartDetect(const char *carthw_cfg);
static void PicoCartDetectMS(void);
/* cso struct */
typedef struct _cso_struct
{
unsigned char in_buff[2*2048];
unsigned char out_buff[2048];
struct {
char magic[4];
unsigned int unused;
unsigned int total_bytes;
unsigned int total_bytes_high; // ignored here
unsigned int block_size; // 10h
unsigned char ver;
unsigned char align;
unsigned char reserved[2];
} header;
unsigned int fpos_in; // input file read pointer
unsigned int fpos_out; // pos in virtual decompressed file
int block_in_buff; // block which we have read in in_buff
int pad;
int index[0];
}
cso_struct;
static int uncompress_buf(void *dest, int destLen, void *source, int sourceLen)
{
z_stream stream;
int err;
stream.next_in = (Bytef*)source;
stream.avail_in = (uInt)sourceLen;
stream.next_out = dest;
stream.avail_out = (uInt)destLen;
stream.zalloc = NULL;
stream.zfree = NULL;
err = inflateInit2(&stream, -15);
if (err != Z_OK) return err;
err = inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
inflateEnd(&stream);
return err;
}
//*destLen = stream.total_out;
return inflateEnd(&stream);
}
static const char *get_ext(const char *path)
{
const char *ext;
if (strlen(path) < 4)
return ""; // no ext
// allow 2 or 3 char extensions for now
ext = path + strlen(path) - 2;
if (ext[-1] != '.') ext--;
if (ext[-1] != '.')
return "";
return ext;
}
struct zip_file {
pm_file file;
ZIP *zip;
struct zipent *entry;
z_stream stream;
unsigned char inbuf[16384];
long start;
unsigned int pos;
};
#if defined(USE_LIBCHDR)
struct chd_struct {
pm_file file;
int fpos;
int sectorsize;
chd_file *chd;
int unitbytes;
int hunkunits;
u8 *hunk;
int hunknum;
};
#endif
pm_file *pm_open(const char *path)
{
pm_file *file = NULL;
const char *ext;
FILE *f;
if (path == NULL)
return NULL;
ext = get_ext(path);
if (strcasecmp(ext, "zip") == 0)
{
struct zip_file *zfile = NULL;
struct zipent *zipentry;
ZIP *zipfile;
int i, ret;
zipfile = openzip(path);
if (zipfile != NULL)
{
/* search for suitable file (right extension or large enough file) */
while ((zipentry = readzip(zipfile)) != NULL)
{
ext = get_ext(zipentry->name);
if (zipentry->uncompressed_size >= 32*1024)
goto found_rom_zip;
for (i = 0; i < sizeof(rom_exts)/sizeof(rom_exts[0]); i++)
if (strcasecmp(ext, rom_exts[i]) == 0)
goto found_rom_zip;
}
/* zipfile given, but nothing found suitable for us inside */
goto zip_failed;
found_rom_zip:
zfile = calloc(1, sizeof(*zfile));
if (zfile == NULL)
goto zip_failed;
ret = seekcompresszip(zipfile, zipentry);
if (ret != 0)
goto zip_failed;
ret = inflateInit2(&zfile->stream, -15);
if (ret != Z_OK) {
elprintf(EL_STATUS, "zip: inflateInit2 %d", ret);
goto zip_failed;
}
zfile->zip = zipfile;
zfile->entry = zipentry;
zfile->start = ftell(zipfile->fp);
zfile->file.file = zfile;
zfile->file.size = zipentry->uncompressed_size;
zfile->file.type = PMT_ZIP;
strncpy(zfile->file.ext, ext, sizeof(zfile->file.ext) - 1);
return &zfile->file;
zip_failed:
closezip(zipfile);
free(zfile);
return NULL;
}
}
else if (strcasecmp(ext, "cso") == 0)
{
cso_struct *cso = NULL, *tmp = NULL;
int i, size;
f = fopen(path, "rb");
if (f == NULL)
goto cso_failed;
#ifdef __GP2X__
/* we use our own buffering */
setvbuf(f, NULL, _IONBF, 0);
#endif
cso = malloc(sizeof(*cso));
if (cso == NULL)
goto cso_failed;
if (fread(&cso->header, 1, sizeof(cso->header), f) != sizeof(cso->header))
goto cso_failed;
cso->header.block_size = CPU_LE4(cso->header.block_size);
cso->header.total_bytes = CPU_LE4(cso->header.total_bytes);
cso->header.total_bytes_high = CPU_LE4(cso->header.total_bytes_high);
if (strncmp(cso->header.magic, "CISO", 4) != 0) {
elprintf(EL_STATUS, "cso: bad header");
goto cso_failed;
}
if (cso->header.block_size != 2048) {
elprintf(EL_STATUS, "cso: bad block size (%u)", cso->header.block_size);
goto cso_failed;
}
size = ((cso->header.total_bytes >> 11) + 1)*4 + sizeof(*cso);
tmp = realloc(cso, size);
if (tmp == NULL)
goto cso_failed;
cso = tmp;
elprintf(EL_STATUS, "allocated %i bytes for CSO struct", size);
size -= sizeof(*cso); // index size
if (fread(cso->index, 1, size, f) != size) {
elprintf(EL_STATUS, "cso: premature EOF");
goto cso_failed;
}
for (i = 0; i < size/4; i++)
cso->index[i] = CPU_LE4(cso->index[i]);
// all ok
cso->fpos_in = ftell(f);
cso->fpos_out = 0;
cso->block_in_buff = -1;
file = calloc(1, sizeof(*file));
if (file == NULL) goto cso_failed;
file->file = f;
file->param = cso;
file->size = cso->header.total_bytes;
file->type = PMT_CSO;
strncpy(file->ext, ext, sizeof(file->ext) - 1);
return file;
cso_failed:
if (cso != NULL) free(cso);
if (f != NULL) fclose(f);
return NULL;
}
#if defined(USE_LIBCHDR)
else if (strcasecmp(ext, "chd") == 0)
{
struct chd_struct *chd = NULL;
chd_file *cf = NULL;
const chd_header *head;
if (chd_open(path, CHD_OPEN_READ, NULL, &cf) != CHDERR_NONE)
goto chd_failed;
// sanity check
head = chd_get_header(cf);
if ((head->hunkbytes == 0) || (head->hunkbytes % CD_FRAME_SIZE))
goto chd_failed;
chd = calloc(1, sizeof(*chd));
if (chd == NULL)
goto chd_failed;
chd->hunk = (u8 *)malloc(head->hunkbytes);
if (!chd->hunk)
goto chd_failed;
chd->chd = cf;
chd->unitbytes = head->unitbytes;
chd->hunkunits = head->hunkbytes / head->unitbytes;
chd->sectorsize = CD_MAX_SECTOR_DATA; // default to RAW mode
chd->fpos = 0;
chd->hunknum = -1;
chd->file.file = chd;
chd->file.type = PMT_CHD;
// subchannel data is skipped, remove it from total size
chd->file.size = head->logicalbytes / CD_FRAME_SIZE * CD_MAX_SECTOR_DATA;
strncpy(chd->file.ext, ext, sizeof(chd->file.ext) - 1);
return &chd->file;
chd_failed:
/* invalid CHD file */
if (chd != NULL) free(chd);
if (cf != NULL) chd_close(cf);
return NULL;
}
#endif
/* not a zip, treat as uncompressed file */
f = fopen(path, "rb");
if (f == NULL) return NULL;
file = calloc(1, sizeof(*file));
if (file == NULL) {
fclose(f);
return NULL;
}
fseek(f, 0, SEEK_END);
file->file = f;
file->param = NULL;
file->size = ftell(f);
file->type = PMT_UNCOMPRESSED;
strncpy(file->ext, ext, sizeof(file->ext) - 1);
fseek(f, 0, SEEK_SET);
#ifdef __GP2X__
if (file->size > 0x400000)
/* we use our own buffering */
setvbuf(f, NULL, _IONBF, 0);
#endif
return file;
}
void pm_sectorsize(int length, pm_file *stream)
{
// CHD reading needs to know how much binary data is in one data sector(=unit)
#if defined(USE_LIBCHDR)
if (stream->type == PMT_CHD) {
struct chd_struct *chd = stream->file;
chd->sectorsize = length;
if (chd->sectorsize > chd->unitbytes)
elprintf(EL_STATUS|EL_ANOMALY, "cd: sector size %d too large for unit %d", chd->sectorsize, chd->unitbytes);
}
#endif
}
#if defined(USE_LIBCHDR)
static size_t _pm_read_chd(void *ptr, size_t bytes, pm_file *stream, int is_audio)
{
int ret = 0;
if (stream->type == PMT_CHD) {
struct chd_struct *chd = stream->file;
// calculate sector and offset in sector
int sectsz = is_audio ? CD_MAX_SECTOR_DATA : chd->sectorsize;
int sector = chd->fpos / sectsz;
int offset = chd->fpos - (sector * sectsz);
// calculate hunk and sector offset in hunk
int hunknum = sector / chd->hunkunits;
int hunksec = sector - (hunknum * chd->hunkunits);
int hunkofs = hunksec * chd->unitbytes;
while (bytes != 0) {
// data left in current sector
int len = sectsz - offset;
// update hunk cache if needed
if (hunknum != chd->hunknum) {
chd_read(chd->chd, hunknum, chd->hunk);
chd->hunknum = hunknum;
}
if (len > bytes)
len = bytes;
#if CPU_IS_LE
if (is_audio) {
// convert big endian audio samples
u16 *dst = ptr, v;
u8 *src = chd->hunk + hunkofs + offset;
int i;
for (i = 0; i < len; i += 4) {
v = *src++ << 8; *dst++ = v | *src++;
v = *src++ << 8; *dst++ = v | *src++;
}
} else
#endif
memcpy(ptr, chd->hunk + hunkofs + offset, len);
// house keeping
ret += len;
chd->fpos += len;
bytes -= len;
// no need to advance internals if there's no more data to read
if (bytes) {
ptr += len;
offset = 0;
sector ++;
hunksec ++;
hunkofs += chd->unitbytes;
if (hunksec >= chd->hunkunits) {
hunksec = 0;
hunkofs = 0;
hunknum ++;
}
}
}
}
return ret;
}
#endif
size_t pm_read(void *ptr, size_t bytes, pm_file *stream)
{
int ret;
if (stream == NULL)
return -1;
else if (stream->type == PMT_UNCOMPRESSED)
{
ret = fread(ptr, 1, bytes, stream->file);
}
else if (stream->type == PMT_ZIP)
{
struct zip_file *z = stream->file;
if (z->entry->compression_method == 0) {
int ret = fread(ptr, 1, bytes, z->zip->fp);
z->pos += ret;
return ret;
}
z->stream.next_out = ptr;
z->stream.avail_out = bytes;
while (z->stream.avail_out != 0) {
if (z->stream.avail_in == 0) {
z->stream.avail_in = fread(z->inbuf, 1, sizeof(z->inbuf), z->zip->fp);
if (z->stream.avail_in == 0)
break;
z->stream.next_in = z->inbuf;
}
ret = inflate(&z->stream, Z_NO_FLUSH);
if (ret == Z_STREAM_END)
break;
if (ret != Z_OK) {
elprintf(EL_STATUS, "zip: inflate: %d", ret);
return 0;
}
}
z->pos += bytes - z->stream.avail_out;
return bytes - z->stream.avail_out;
}
else if (stream->type == PMT_CSO)
{
cso_struct *cso = stream->param;
int read_pos, read_len, out_offs, rret;
int block = cso->fpos_out >> 11;
int index = cso->index[block];
int index_end = cso->index[block+1];
unsigned char *out = ptr, *tmp_dst;
ret = 0;
while (bytes != 0)
{
out_offs = cso->fpos_out&0x7ff;
if (out_offs == 0 && bytes >= 2048)
tmp_dst = out;
else tmp_dst = cso->out_buff;
read_pos = (index&0x7fffffff) << cso->header.align;
if (index < 0) {
if (read_pos != cso->fpos_in)
fseek(stream->file, read_pos, SEEK_SET);
rret = fread(tmp_dst, 1, 2048, stream->file);
cso->fpos_in = read_pos + rret;
if (rret != 2048) break;
} else {
read_len = (((index_end&0x7fffffff) << cso->header.align) - read_pos) & 0xfff;
if (block != cso->block_in_buff)
{
if (read_pos != cso->fpos_in)
fseek(stream->file, read_pos, SEEK_SET);
rret = fread(cso->in_buff, 1, read_len, stream->file);
cso->fpos_in = read_pos + rret;
if (rret != read_len) {
elprintf(EL_STATUS, "cso: read failed @ %08x", read_pos);
break;
}
cso->block_in_buff = block;
}
rret = uncompress_buf(tmp_dst, 2048, cso->in_buff, read_len);
if (rret != 0) {
elprintf(EL_STATUS, "cso: uncompress failed @ %08x with %i", read_pos, rret);
break;
}
}
rret = 2048;
if (out_offs != 0 || bytes < 2048) {
//elprintf(EL_STATUS, "cso: unaligned/nonfull @ %08x, offs=%i, len=%u", cso->fpos_out, out_offs, bytes);
if (bytes < rret) rret = bytes;
if (2048 - out_offs < rret) rret = 2048 - out_offs;
memcpy(out, tmp_dst + out_offs, rret);
}
ret += rret;
out += rret;
cso->fpos_out += rret;
bytes -= rret;
block++;
index = index_end;
index_end = cso->index[block+1];
}
}
#if defined(USE_LIBCHDR)
else if (stream->type == PMT_CHD)
{
ret = _pm_read_chd(ptr, bytes, stream, 0);
}
#endif
else
ret = 0;
return ret;
}
size_t pm_read_audio(void *ptr, size_t bytes, pm_file *stream)
{
if (stream == NULL)
return -1;
#if !(CPU_IS_LE)
else if (stream->type == PMT_UNCOMPRESSED)
{
// convert little endian audio samples from WAV file
int ret = pm_read(ptr, bytes, stream);
u16 *dst = ptr, v;
u8 *src = ptr;
int i;
for (i = 0; i < ret; i += 4) {
v = *src++; *dst++ = v | (*src++ << 8);
v = *src++; *dst++ = v | (*src++ << 8);
}
return ret;
}
else
#endif
#if defined(USE_LIBCHDR)
if (stream->type == PMT_CHD)
{
return _pm_read_chd(ptr, bytes, stream, 1);
}
#endif
return pm_read(ptr, bytes, stream);
}
int pm_seek(pm_file *stream, long offset, int whence)
{
if (stream == NULL)
return -1;
else if (stream->type == PMT_UNCOMPRESSED)
{
fseek(stream->file, offset, whence);
return ftell(stream->file);
}
else if (stream->type == PMT_ZIP)
{
struct zip_file *z = stream->file;
unsigned int pos = z->pos;
int ret;
switch (whence)
{
case SEEK_CUR: pos += offset; break;
case SEEK_SET: pos = offset; break;
case SEEK_END: pos = stream->size - offset; break;
}
if (z->entry->compression_method == 0) {
ret = fseek(z->zip->fp, z->start + pos, SEEK_SET);
if (ret == 0)
return (z->pos = pos);
return -1;
}
offset = pos - z->pos;
if (pos < z->pos) {
// full decompress from the start
fseek(z->zip->fp, z->start, SEEK_SET);
z->stream.avail_in = 0;
z->stream.next_in = z->inbuf;
inflateReset(&z->stream);
z->pos = 0;
offset = pos;
}
if (PicoIn.osdMessage != NULL && offset > 4 * 1024 * 1024)
PicoIn.osdMessage("Decompressing data...");
while (offset > 0) {
char buf[16 * 1024];
size_t l = offset > sizeof(buf) ? sizeof(buf) : offset;
ret = pm_read(buf, l, stream);
if (ret != l)
break;
offset -= l;
}
return z->pos;
}
else if (stream->type == PMT_CSO)
{
cso_struct *cso = stream->param;
switch (whence)
{
case SEEK_CUR: cso->fpos_out += offset; break;
case SEEK_SET: cso->fpos_out = offset; break;
case SEEK_END: cso->fpos_out = cso->header.total_bytes - offset; break;
}
return cso->fpos_out;
}
#if defined(USE_LIBCHDR)
else if (stream->type == PMT_CHD)
{
struct chd_struct *chd = stream->file;
switch (whence)
{
case SEEK_CUR: chd->fpos += offset; break;
case SEEK_SET: chd->fpos = offset; break;
case SEEK_END: chd->fpos = stream->size - offset; break;
}
return chd->fpos;
}
#endif
else
return -1;
}
int pm_close(pm_file *fp)
{
int ret = 0;
if (fp == NULL) return EOF;
if (fp->type == PMT_UNCOMPRESSED)
{
fclose(fp->file);
}
else if (fp->type == PMT_ZIP)
{
struct zip_file *z = fp->file;
inflateEnd(&z->stream);
closezip(z->zip);
}
else if (fp->type == PMT_CSO)
{
free(fp->param);
fclose(fp->file);
}
#if defined(USE_LIBCHDR)
else if (fp->type == PMT_CHD)
{
struct chd_struct *chd = fp->file;
chd_close(chd->chd);
if (chd->hunk)
free(chd->hunk);
}
#endif
else
ret = EOF;
free(fp);
return ret;
}
// byteswap, data needs to be int aligned, src can match dst
void Byteswap(void *dst, const void *src, int len)
{
#if CPU_IS_LE
const unsigned int *ps = src;
unsigned int *pd = dst;
int i, m;
if (len < 2)
return;
m = 0x00ff00ff;
for (i = 0; i < len / 4; i++) {
unsigned int t = ps[i];
pd[i] = ((t & m) << 8) | ((t & ~m) >> 8);
}
#endif
}
// Interleve a 16k block and byteswap
static int InterleveBlock(unsigned char *dest,unsigned char *src)
{
int i=0;
for (i=0;i<0x2000;i++) dest[(i<<1)+MEM_BE2(1)]=src[ i]; // Odd
for (i=0;i<0x2000;i++) dest[(i<<1)+MEM_BE2(0)]=src[0x2000+i]; // Even
return 0;
}
// Decode a SMD file
static int DecodeSmd(unsigned char *data,int len)
{
unsigned char *temp=NULL;
int i=0;
temp=(unsigned char *)malloc(0x4000);
if (temp==NULL) return 1;
memset(temp,0,0x4000);
// Interleve each 16k block and shift down by 0x200:
for (i=0; i+0x4200<=len; i+=0x4000)
{
InterleveBlock(temp,data+0x200+i); // Interleve 16k to temporary buffer
memcpy(data+i,temp,0x4000); // Copy back in
}
free(temp);
return 0;
}
static unsigned char *PicoCartAlloc(int filesize, int is_sms)
{
unsigned char *rom;
// make size power of 2 for easier banking handling
int s = 0, tmp = filesize;
while ((tmp >>= 1) != 0)
s++;
if (filesize > (1 << s))
s++;
rom_alloc_size = 1 << s;
if (is_sms) {
// be sure we can cover all address space
if (rom_alloc_size < 0x10000)
rom_alloc_size = 0x10000;
}
else {
// align to 512K for memhandlers
rom_alloc_size = (rom_alloc_size + 0x7ffff) & ~0x7ffff;
}
if (rom_alloc_size - filesize < 4)
rom_alloc_size += 4; // padding for out-of-bound exec protection
// Allocate space for the rom plus padding
// use special address for 32x dynarec
rom = plat_mmap(0x02000000, rom_alloc_size, 0, 0);
return rom;
}
int PicoCartLoad(pm_file *f, const unsigned char *rom, unsigned int romsize,
unsigned char **prom, unsigned int *psize, int is_sms)
{
unsigned char *rom_data = NULL;
int size, bytes_read;
if (!f && !rom)
return 1;
if (!rom)
size = f->size;
else
size = romsize;
if (size <= 0) return 1;
size = (size+3)&~3; // Round up to a multiple of 4
// Allocate space for the rom plus padding
rom_data = PicoCartAlloc(size, is_sms);
if (rom_data == NULL) {
elprintf(EL_STATUS, "out of memory (wanted %i)", size);
return 2;
}
if (!rom) {
if (PicoCartLoadProgressCB != NULL)
{
// read ROM in blocks, just for fun
int ret;
unsigned char *p = rom_data;
bytes_read=0;
do
{
int todo = size - bytes_read;
if (todo > 256*1024) todo = 256*1024;
ret = pm_read(p,todo,f);
bytes_read += ret;
p += ret;
PicoCartLoadProgressCB(bytes_read * 100LL / size);
}
while (ret > 0);
}
else
bytes_read = pm_read(rom_data,size,f); // Load up the rom
if (bytes_read <= 0) {
elprintf(EL_STATUS, "read failed");
plat_munmap(rom_data, rom_alloc_size);
return 3;
}
}
else
memcpy(rom_data, rom, romsize);
if (!is_sms)
{
// maybe we are loading MegaCD BIOS?
if (!(PicoIn.AHW & PAHW_MCD) && size == 0x20000 && (!strncmp((char *)rom_data+0x124, "BOOT", 4) ||
!strncmp((char *)rom_data+0x128, "BOOT", 4))) {
PicoIn.AHW |= PAHW_MCD;
}
// Check for SMD:
if (size >= 0x4200 && (size&0x3fff) == 0x200 &&
((rom_data[0x2280] == 'S' && rom_data[0x280] == 'E') || (rom_data[0x280] == 'S' && rom_data[0x2281] == 'E'))) {
elprintf(EL_STATUS, "SMD format detected.");
DecodeSmd(rom_data,size); size-=0x200; // Decode and byteswap SMD
}
else Byteswap(rom_data, rom_data, size); // Just byteswap
}
else
{
if (size >= 0x4200 && (size&0x3fff) == 0x200) {
elprintf(EL_STATUS, "SMD format detected.");
// at least here it's not interleaved
size -= 0x200;
memmove(rom_data, rom_data + 0x200, size);
}
}
if (prom) *prom = rom_data;
if (psize) *psize = size;
return 0;
}
// Insert a cartridge:
int PicoCartInsert(unsigned char *rom, unsigned int romsize, const char *carthw_cfg)
{
// notaz: add a 68k "jump one op back" opcode to the end of ROM.
// This will hang the emu, but will prevent nasty crashes.
// note: 4 bytes are padded to every ROM
if (rom != NULL)
*(u32 *)(rom+romsize) = CPU_BE2(0x4EFAFFFE);
Pico.rom=rom;
Pico.romsize=romsize;
if (Pico.sv.data) {
free(Pico.sv.data);
Pico.sv.data = NULL;
}
if (PicoCartUnloadHook != NULL) {
PicoCartUnloadHook();
PicoCartUnloadHook = NULL;
}
pdb_cleanup();
PicoIn.AHW &= ~(PAHW_32X|PAHW_SVP);
PicoCartMemSetup = NULL;
PicoDmaHook = NULL;
PicoResetHook = NULL;
PicoLineHook = NULL;
PicoLoadStateHook = NULL;
carthw_chunks = NULL;
if (!(PicoIn.AHW & (PAHW_MCD|PAHW_SMS|PAHW_PICO)))
PicoCartDetect(carthw_cfg);
if (PicoIn.AHW & PAHW_SMS)
PicoCartDetectMS();
if (PicoIn.AHW & PAHW_SVP)
PicoSVPStartup();
if (PicoIn.AHW & PAHW_PICO)
PicoInitPico();
// setup correct memory map for loaded ROM
switch (PicoIn.AHW & ~(PAHW_GG|PAHW_SG|PAHW_SC)) {
default:
elprintf(EL_STATUS|EL_ANOMALY, "starting in unknown hw configuration: %x", PicoIn.AHW);
case 0:
case PAHW_SVP: PicoMemSetup(); break;
case PAHW_MCD: PicoMemSetupCD(); break;
case PAHW_PICO: PicoMemSetupPico(); break;
case PAHW_SMS: PicoMemSetupMS(); break;
}
if (PicoCartMemSetup != NULL)
PicoCartMemSetup();
if (PicoIn.AHW & PAHW_SMS)
PicoPowerMS();
else
PicoPower();
PicoGameLoaded = 1;
return 0;
}
int PicoCartResize(int newsize)
{
void *tmp = plat_mremap(Pico.rom, rom_alloc_size, newsize);
if (tmp == NULL)
return -1;
Pico.rom = tmp;
rom_alloc_size = newsize;
return 0;
}
void PicoCartUnload(void)
{
if (PicoCartUnloadHook != NULL) {
PicoCartUnloadHook();
PicoCartUnloadHook = NULL;
}
PicoUnload32x();
if (Pico.rom != NULL) {
SekFinishIdleDet();
plat_munmap(Pico.rom, rom_alloc_size);
Pico.rom = NULL;
}
PicoGameLoaded = 0;
}
static unsigned int rom_crc32(int size)
{
unsigned int crc;
elprintf(EL_STATUS, "caclulating CRC32..");
if (size <= 0 || size > Pico.romsize) size = Pico.romsize;
// have to unbyteswap for calculation..
Byteswap(Pico.rom, Pico.rom, size);
crc = crc32(0, Pico.rom, size);
Byteswap(Pico.rom, Pico.rom, size);
return crc;
}
static int rom_strcmp(int rom_offset, const char *s1)
{
int i, len = strlen(s1);
const char *s_rom = (const char *)Pico.rom;
if (rom_offset + len > Pico.romsize)
return 0;
for (i = 0; i < len; i++)
if (s1[i] != s_rom[MEM_BE2(i + rom_offset)])
return 1;
return 0;
}
static unsigned int rom_read32(int addr)
{
unsigned short *m = (unsigned short *)(Pico.rom + addr);
return (m[0] << 16) | m[1];
}
static char *sskip(char *s)
{
while (*s && isspace_(*s))
s++;
return s;
}
static void rstrip(char *s)
{
char *p;
for (p = s + strlen(s) - 1; p >= s; p--)
if (isspace_(*p))
*p = 0;
}
static int parse_3_vals(char *p, int *val0, int *val1, int *val2)
{
char *r;
*val0 = strtoul(p, &r, 0);
if (r == p)
goto bad;
p = sskip(r);
if (*p++ != ',')
goto bad;
*val1 = strtoul(p, &r, 0);
if (r == p)
goto bad;
p = sskip(r);
if (*p++ != ',')
goto bad;
*val2 = strtoul(p, &r, 0);
if (r == p)
goto bad;
return 1;
bad:
return 0;
}
static int is_expr(const char *expr, char **pr)
{
int len = strlen(expr);
char *p = *pr;
if (strncmp(expr, p, len) != 0)
return 0;
p = sskip(p + len);
if (*p != '=')
return 0; // wrong or malformed
*pr = sskip(p + 1);
return 1;
}
#include "carthw_cfg.c"
static void parse_carthw(const char *carthw_cfg, int *fill_sram,
int *hw_detected)
{
int line = 0, any_checks_passed = 0, skip_sect = 0;
const char *s, *builtin = builtin_carthw_cfg;
int tmp, rom_crc = 0;
char buff[256], *p, *r;
FILE *f;
f = fopen(carthw_cfg, "r");
if (f == NULL)
f = fopen("pico/carthw.cfg", "r");
if (f == NULL)
elprintf(EL_STATUS, "couldn't open carthw.cfg!");
for (;;)
{
if (f != NULL) {
p = fgets(buff, sizeof(buff), f);
if (p == NULL)
break;
}
else {
if (*builtin == 0)
break;
for (s = builtin; *s != 0 && *s != '\n'; s++)
;
while (*s == '\n')
s++;
tmp = s - builtin;
if (tmp > sizeof(buff) - 1)
tmp = sizeof(buff) - 1;
memcpy(buff, builtin, tmp);
buff[tmp] = 0;
p = buff;
builtin = s;
}
line++;
p = sskip(p);
if (*p == 0 || *p == '#')
continue;
if (*p == '[') {
any_checks_passed = 0;
skip_sect = 0;
continue;
}
if (skip_sect)
continue;
/* look for checks */
if (is_expr("check_str", &p))
{
int offs;
offs = strtoul(p, &r, 0);
if (offs < 0 || offs > Pico.romsize) {
elprintf(EL_STATUS, "carthw:%d: check_str offs out of range: %d\n", line, offs);
goto bad;
}
p = sskip(r);
if (*p != ',')
goto bad;
p = sskip(p + 1);
if (*p != '"')
goto bad;
p++;
r = strchr(p, '"');
if (r == NULL)
goto bad;
*r = 0;
if (rom_strcmp(offs, p) == 0)
any_checks_passed = 1;
else
skip_sect = 1;
continue;
}
else if (is_expr("check_size_gt", &p))
{
int size;
size = strtoul(p, &r, 0);
if (r == p || size < 0)
goto bad;
if (Pico.romsize > size)
any_checks_passed = 1;
else
skip_sect = 1;
continue;
}
else if (is_expr("check_csum", &p))
{
int csum;
csum = strtoul(p, &r, 0);
if (r == p || (csum & 0xffff0000))
goto bad;
if (csum == (rom_read32(0x18c) & 0xffff))
any_checks_passed = 1;
else
skip_sect = 1;
continue;
}
else if (is_expr("check_crc32", &p))
{
unsigned int crc;
crc = strtoul(p, &r, 0);
if (r == p)
goto bad;
if (rom_crc == 0)
rom_crc = rom_crc32(64*1024);
if (crc == rom_crc)
any_checks_passed = 1;
else
skip_sect = 1;
continue;
}
/* now time for actions */
if (is_expr("hw", &p)) {
if (!any_checks_passed)
goto no_checks;
*hw_detected = 1;
rstrip(p);
if (strcmp(p, "svp") == 0)
PicoIn.AHW = PAHW_SVP;
else if (strcmp(p, "pico") == 0)
PicoIn.AHW = PAHW_PICO;
else if (strcmp(p, "prot") == 0)
carthw_sprot_startup();
else if (strcmp(p, "ssf2_mapper") == 0)
carthw_ssf2_startup();
else if (strcmp(p, "x_in_1_mapper") == 0)
carthw_Xin1_startup();
else if (strcmp(p, "realtec_mapper") == 0)
carthw_realtec_startup();
else if (strcmp(p, "radica_mapper") == 0)
carthw_radica_startup();
else if (strcmp(p, "piersolar_mapper") == 0)
carthw_pier_startup();
else if (strcmp(p, "sf001_mapper") == 0)
carthw_sf001_startup();
else if (strcmp(p, "sf002_mapper") == 0)
carthw_sf002_startup();
else if (strcmp(p, "sf004_mapper") == 0)
carthw_sf004_startup();
else if (strcmp(p, "lk3_mapper") == 0)
carthw_lk3_startup();
else if (strcmp(p, "smw64_mapper") == 0)
carthw_smw64_startup();
else {
elprintf(EL_STATUS, "carthw:%d: unsupported mapper: %s", line, p);
skip_sect = 1;
*hw_detected = 0;
}
continue;
}
if (is_expr("sram_range", &p)) {
int start, end;
if (!any_checks_passed)
goto no_checks;
rstrip(p);
start = strtoul(p, &r, 0);
if (r == p)
goto bad;
p = sskip(r);
if (*p != ',')
goto bad;
p = sskip(p + 1);
end = strtoul(p, &r, 0);
if (r == p)
goto bad;
if (((start | end) & 0xff000000) || start > end) {
elprintf(EL_STATUS, "carthw:%d: bad sram_range: %08x - %08x", line, start, end);
goto bad_nomsg;
}
Pico.sv.start = start;
Pico.sv.end = end;
continue;
}
else if (is_expr("prop", &p)) {
if (!any_checks_passed)
goto no_checks;
rstrip(p);
if (strcmp(p, "no_sram") == 0)
Pico.sv.flags &= ~SRF_ENABLED;
else if (strcmp(p, "no_eeprom") == 0)
Pico.sv.flags &= ~SRF_EEPROM;
else if (strcmp(p, "filled_sram") == 0)
*fill_sram = 1;
else if (strcmp(p, "wwfraw_hack") == 0)
PicoIn.quirks |= PQUIRK_WWFRAW_HACK;
else if (strcmp(p, "blackthorne_hack") == 0)
PicoIn.quirks |= PQUIRK_BLACKTHORNE_HACK;
else if (strcmp(p, "marscheck_hack") == 0)
PicoIn.quirks |= PQUIRK_MARSCHECK_HACK;
else if (strcmp(p, "force_6btn") == 0)
PicoIn.quirks |= PQUIRK_FORCE_6BTN;
else if (strcmp(p, "no_z80_bus_lock") == 0)
PicoIn.quirks |= PQUIRK_NO_Z80_BUS_LOCK;
else {
elprintf(EL_STATUS, "carthw:%d: unsupported prop: %s", line, p);
goto bad_nomsg;
}
elprintf(EL_STATUS, "game prop: %s", p);
continue;
}
else if (is_expr("eeprom_type", &p)) {
int type;
if (!any_checks_passed)
goto no_checks;
rstrip(p);
type = strtoul(p, &r, 0);
if (r == p || type < 0)
goto bad;
Pico.sv.eeprom_type = type;
Pico.sv.flags |= SRF_EEPROM;
continue;
}
else if (is_expr("eeprom_lines", &p)) {
int scl, sda_in, sda_out;
if (!any_checks_passed)
goto no_checks;
rstrip(p);
if (!parse_3_vals(p, &scl, &sda_in, &sda_out))
goto bad;
if (scl < 0 || scl > 15 || sda_in < 0 || sda_in > 15 ||
sda_out < 0 || sda_out > 15)
goto bad;
Pico.sv.eeprom_bit_cl = scl;
Pico.sv.eeprom_bit_in = sda_in;
Pico.sv.eeprom_bit_out= sda_out;
continue;
}
else if ((tmp = is_expr("prot_ro_value16", &p)) || is_expr("prot_rw_value16", &p)) {
int addr, mask, val;
if (!any_checks_passed)
goto no_checks;
rstrip(p);
if (!parse_3_vals(p, &addr, &mask, &val))
goto bad;
carthw_sprot_new_location(addr, mask, val, tmp ? 1 : 0);
continue;
}
bad:
elprintf(EL_STATUS, "carthw:%d: unrecognized expression: %s", line, buff);
bad_nomsg:
skip_sect = 1;
continue;
no_checks:
elprintf(EL_STATUS, "carthw:%d: command without any checks before it: %s", line, buff);
skip_sect = 1;
continue;
}
if (f != NULL)
fclose(f);
}
/*
* various cart-specific things, which can't be handled by generic code
*/
static void PicoCartDetect(const char *carthw_cfg)
{
int carthw_detected = 0;
int fill_sram = 0;
memset(&Pico.sv, 0, sizeof(Pico.sv));
if (Pico.rom[MEM_BE2(0x1B0)] == 'R' && Pico.rom[MEM_BE2(0x1B1)] == 'A')
{
Pico.sv.start = rom_read32(0x1B4) & ~0xff000001; // align
Pico.sv.end = (rom_read32(0x1B8) & ~0xff000000) | 1;
if (Pico.rom[MEM_BE2(0x1B3)] & 0x40)
// EEPROM
Pico.sv.flags |= SRF_EEPROM;
Pico.sv.flags |= SRF_ENABLED;
}
if (Pico.sv.end == 0 || Pico.sv.start > Pico.sv.end)
{
// some games may have bad headers, like S&K and Sonic3
// note: majority games use 0x200000 as starting address, but there are some which
// use something else (0x300000 by HardBall '95). Luckily they have good headers.
Pico.sv.start = 0x200000;
Pico.sv.end = 0x203FFF;
Pico.sv.flags |= SRF_ENABLED;
}
// set EEPROM defaults, in case it gets detected
Pico.sv.eeprom_type = 0; // 7bit (24C01)
Pico.sv.eeprom_bit_cl = 1;
Pico.sv.eeprom_bit_in = 0;
Pico.sv.eeprom_bit_out= 0;
if (carthw_cfg != NULL)
parse_carthw(carthw_cfg, &fill_sram, &carthw_detected);
// assume the standard mapper for large roms
if (!carthw_detected && Pico.romsize > 0x400000)
carthw_ssf2_startup();
if (Pico.sv.flags & SRF_ENABLED)
{
if (Pico.sv.flags & SRF_EEPROM)
Pico.sv.size = 0x2000;
else
Pico.sv.size = Pico.sv.end - Pico.sv.start + 1;
Pico.sv.data = calloc(Pico.sv.size, 1);
if (Pico.sv.data == NULL)
Pico.sv.flags &= ~SRF_ENABLED;
if (Pico.sv.eeprom_type == 1) // 1 == 0 in PD EEPROM code
Pico.sv.eeprom_type = 0;
}
if ((Pico.sv.flags & SRF_ENABLED) && fill_sram)
{
elprintf(EL_STATUS, "SRAM fill");
memset(Pico.sv.data, 0xff, Pico.sv.size);
}
// Unusual region 'code'
if (rom_strcmp(0x1f0, "EUROPE") == 0 || rom_strcmp(0x1f0, "Europe") == 0)
*(u32 *) (Pico.rom + 0x1f0) = CPU_LE4(0x20204520);
// tweak for Blackthorne: master SH2 overwrites stack of slave SH2 being in PWM
// interrupt. On real hardware, nothing happens since slave fetches the values
// it has written from its cache, but picodrive doesn't emulate caching.
// move master memory area down by 0x100 bytes.
// XXX replace this abominable hack. It might cause other problems in the game!
if (PicoIn.quirks & PQUIRK_BLACKTHORNE_HACK) {
int i;
unsigned a = 0;
for (i = 0; i < Pico.romsize; i += 4) {
unsigned v = CPU_BE2(*(u32 *) (Pico.rom + i));
if (a && v == a + 0x400) { // patch if 2 pointers with offset 0x400 are found
elprintf(EL_STATUS, "auto-patching @%06x: %08x->%08x\n", i, v, v - 0x100);
*(u32 *) (Pico.rom + i) = CPU_BE2(v - 0x100);
}
// detect a pointer into the incriminating area
a = 0;
if (v >> 12 == 0x0603f000 >> 12 && !(v & 3))
a = v;
}
}
// tweak for Mars Check Program: copies 32K longwords (128KB) from a 64KB buffer
// in ROM or DRAM to SDRAM with DMA in 4-longword mode, overwriting an SDRAM comm
// area in turn. This crashes the test on emulators without CPU cache emulation.
// This may be a bug in Mars Check, since it's only checking for the 64KB result.
// Patch the DMA transfers so that they transfer only 64KB.
if (PicoIn.quirks & PQUIRK_MARSCHECK_HACK) {
int i;
unsigned a = 0;
for (i = 0; i < Pico.romsize; i += 4) {
unsigned v = CPU_BE2(*(u32 *) (Pico.rom + i));
if (a == 0xffffff8c && v == 0x5ee1) { // patch if 4-long xfer written to CHCR
elprintf(EL_STATUS, "auto-patching @%06x: %08x->%08x\n", i, v, v & ~0x800);
*(u32 *) (Pico.rom + i) = CPU_BE2(v & ~0x800); // change to half-sized xfer
}
a = v;
}
}
}
static void PicoCartDetectMS(void)
{
memset(&Pico.sv, 0, sizeof(Pico.sv));
// Always map SRAM, since there's no indicator in ROM if it's needed or not
// TODO: this should somehow be coming from a cart database!
Pico.sv.size = 0x8000; // Sega mapper, 2 banks of 16 KB each
Pico.sv.flags |= SRF_ENABLED;
Pico.sv.data = calloc(Pico.sv.size, 1);
if (Pico.sv.data == NULL)
Pico.sv.flags &= ~SRF_ENABLED;
}
// vim:shiftwidth=2:expandtab
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