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rockbox/apps/plugins/rockboy/loader.c

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C
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#include "rockmacros.h"
#include "defs.h"
#include "regs.h"
#include "mem.h"
#include "hw.h"
#include "lcd-gb.h"
#include "rtc-gb.h"
#include "save.h"
#include "sound.h"
/* From http://www.semis.demon.co.uk/Gameboy/Gbspec.txt (4/17/2007)
* Cartridge type:
* 0 - ROM ONLY 12 - ROM+MBC3+RAM
* 1 - ROM+MBC1 13 - ROM+MBC3+RAM+BATT
* 2 - ROM+MBC1+RAM 19 - ROM+MBC5
* 3 - ROM+MBC1+RAM+BATT 1A - ROM+MBC5+RAM
* 5 - ROM+MBC2 1B - ROM+MBC5+RAM+BATT
* 6 - ROM+MBC2+BATTERY 1C - ROM+MBC5+RUMBLE
* 8 - ROM+RAM 1D - ROM+MBC5+RUMBLE+SRAM
* 9 - ROM+RAM+BATTERY 1E - ROM+MBC5+RUMBLE+SRAM+BATT
* B - ROM+MMM01 1F - Pocket Camera
* C - ROM+MMM01+SRAM FD - Bandai TAMA5
* D - ROM+MMM01+SRAM+BATT FE - Hudson HuC-3
* F - ROM+MBC3+TIMER+BATT FF - Hudson HuC-1
* 10 - ROM+MBC3+TIMER+RAM+BATT
* 11 - ROM+MBC3
*/
static int mbc_table[256] =
{
MBC_NONE,
MBC_MBC1,
MBC_MBC1,
MBC_MBC1 | MBC_BAT,
0,
MBC_MBC2,
MBC_MBC2 | MBC_BAT,
0,
0,
MBC_BAT,
0,
0,
0,
MBC_BAT,
0,
MBC_MBC3 | MBC_BAT | MBC_RTC,
MBC_MBC3 | MBC_BAT | MBC_RTC,
MBC_MBC3,
MBC_MBC3,
MBC_MBC3 | MBC_BAT,
0,
0,
0,
0,
0,
MBC_MBC5,
MBC_MBC5,
MBC_MBC5 | MBC_BAT,
MBC_RUMBLE,
MBC_RUMBLE,
MBC_RUMBLE | MBC_BAT,
0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
MBC_HUC3,
MBC_HUC1
};
static unsigned short romsize_table[56] =
{
2, 4, 8, 16, 32, 64, 128, 256,
512, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 128, 128, 128, 0
/* 0, 0, 0, 0, 72, 80, 96 -- actual values but bad to use these! */
};
/* Ram size should be no larger then 16 banks 1Mbit */
static unsigned char ramsize_table[5] =
{
0, 1, 1, 4, 16
};
static char *romfile;
static char sramfile[500];
static char rtcfile[500];
static char saveprefix[500];
static int saveslot;
static int forcebatt, nobatt;
static int forcedmg;
static int memfill = -1, memrand = -1;
static void initmem(void *mem, int size)
{
char *p = mem;
if (memrand >= 0)
{
srand(memrand ? memrand : -6 ); /* time(0)); */
while(size--) *(p++) = rand();
}
else if (memfill >= 0)
memset(p, memfill, size);
}
static byte *loadfile(int fd, int *len)
{
int c;
byte *d;
*len=lseek(fd,0,SEEK_END);
d=malloc((*len)*sizeof(char)+64);
if(d==0)
{
die("Not enough memory");
return 0;
}
lseek(fd,0,SEEK_SET);
c = read(fd, d, *len);
return d;
}
int rom_load(void)
{
int fd;
byte c, *data, *header;
int len = 0, rlen;
fd = open(romfile, O_RDONLY);
if (fd<0)
{
die("cannot open rom file %s", romfile);
return 1;
}
data = loadfile(fd, &len);
close(fd);
if(data==0)
{
die("Not Enough Memory");
return 1;
}
header = data; /* no zip. = decompress(data, &len); */
memcpy(rom.name, header+0x0134, 16);
if (rom.name[14] & 0x80) rom.name[14] = 0;
if (rom.name[15] & 0x80) rom.name[15] = 0;
rom.name[16] = 0;
c = header[0x0147];
mbc.type = mbc_table[c]&(MBC_MBC1|MBC_MBC2|MBC_MBC3|MBC_MBC5|MBC_RUMBLE|MBC_HUC1|MBC_HUC3);
mbc.batt = ((mbc_table[c]&MBC_BAT) && !nobatt) || forcebatt;
rtc.batt = mbc_table[c]&MBC_RTC;
if(header[0x0148]<10 || (header[0x0148]>51 && header[0x0148]<55))
mbc.romsize = romsize_table[header[0x0148]];
else
{
die("unknown ROM size %02X\n", header[0x0148]);
return 1;
}
if(header[0x0149]<5)
mbc.ramsize = ramsize_table[header[0x0149]];
else
{
die("unknown SRAM size %02X\n", header[0x0149]);
return 1;
}
rlen = 16384 * mbc.romsize;
rom.bank = (void *) data; /* realloc(data, rlen); */
if (rlen > len) memset(rom.bank[0]+len, 0xff, rlen - len);
/* This is the size of the ram on the cartridge
* See http://www.semis.demon.co.uk/Gameboy/Gbspec.txt
* for a full description. (8192*number of banks)
*/
ram.sbank = malloc(8192 * mbc.ramsize);
if(ram.sbank==0 && mbc.ramsize!=0)
{
die("Not enough Memory");
return 1;
}
/* ram.ibank = malloc(4096*8); */
initmem(ram.sbank, 8192 * mbc.ramsize);
initmem(ram.ibank, 4096 * 8);
mbc.rombank = 1;
mbc.rambank = 0;
c = header[0x0143];
hw.cgb = ((c == 0x80) || (c == 0xc0)) && !forcedmg;
return 0;
}
int sram_load(void)
{
int fd;
char meow[500];
if (!mbc.batt || !sramfile || !*sramfile) return -1;
/* Consider sram loaded at this point, even if file doesn't exist */
ram.loaded = 1;
fd = open(sramfile, O_RDONLY);
snprintf(meow,499,"Opening %s %d",sramfile,fd);
rb->splash(HZ*2, meow);
if (fd<0) return -1;
snprintf(meow,499,"Loading savedata from %s",sramfile);
rb->splash(HZ*2, meow);
read(fd,ram.sbank, 8192*mbc.ramsize);
close(fd);
return 0;
}
int sram_save(void)
{
int fd;
char meow[500];
/* If we crash before we ever loaded sram, DO NOT SAVE! */
if (!mbc.batt || !sramfile || !ram.loaded || !mbc.ramsize)
return -1;
fd = open(sramfile, O_WRONLY|O_CREAT|O_TRUNC);
if (fd<0) return -1;
snprintf(meow,499,"Saving savedata to %s",sramfile);
rb->splash(HZ*2, meow);
write(fd,ram.sbank, 8192*mbc.ramsize);
close(fd);
return 0;
}
void state_save(int n)
{
int fd;
char name[500];
if (n < 0) n = saveslot;
if (n < 0) n = 0;
snprintf(name, 499,"%s.%03d", saveprefix, n);
if ((fd = open(name, O_WRONLY|O_CREAT|O_TRUNC)>=0))
{
savestate(fd);
close(fd);
}
}
void state_load(int n)
{
int fd;
char name[500];
if (n < 0) n = saveslot;
if (n < 0) n = 0;
snprintf(name, 499, "%s.%03d", saveprefix, n);
if ((fd = open(name, O_RDONLY)>=0))
{
loadstate(fd);
close(fd);
vram_dirty();
pal_dirty();
sound_dirty();
mem_updatemap();
}
}
void rtc_save(void)
{
int fd;
if (!rtc.batt) return;
if ((fd = open(rtcfile, O_WRONLY|O_CREAT|O_TRUNC))<0) return;
rtc_save_internal(fd);
close(fd);
}
void rtc_load(void)
{
int fd;
if (!rtc.batt) return;
if ((fd = open(rtcfile, O_RDONLY))<0) return;
rtc_load_internal(fd);
close(fd);
}
void loader_unload(void)
{
sram_save();
/* if (romfile) free(romfile);
if (sramfile) free(sramfile);
if (saveprefix) free(saveprefix);
if (rom.bank) free(rom.bank);
if (ram.sbank) free(ram.sbank); */
romfile = 0;
rom.bank = 0;
ram.sbank = 0;
mbc.type = mbc.romsize = mbc.ramsize = mbc.batt = 0;
}
void cleanup(void)
{
sram_save();
rtc_save();
/* IDEA - if error, write emergency savestate..? */
}
void loader_init(char *s)
{
romfile = s;
if(rom_load())
return;
rb->splash(HZ/2, rom.name);
snprintf(saveprefix, 499, "%s/%s", savedir, rom.name);
strcpy(sramfile, saveprefix);
strcat(sramfile, ".sav");
strcpy(rtcfile, saveprefix);
strcat(rtcfile, ".rtc");
sram_load();
rtc_load();
}
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