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load.c
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load.c
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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "gbc.h"
#define CART_TYPE(id, mbctype, extram, battery, timer, rumble) \
case id: \
mbc = mbctype; \
ext_ram = extram; \
batt = battery; \
rtc = timer; \
rmbl = rumble; \
break;
static const unsigned char id[0x30] =
{
0xCE, 0xED, 0x66, 0x66, 0xCC, 0x0D, 0x00, 0x0B, 0x03, 0x73, 0x00, 0x83, 0x00, 0x0C, 0x00, 0x0D,
0x00, 0x08, 0x11, 0x1F, 0x88, 0x89, 0x00, 0x0E, 0xDC, 0xCC, 0x6E, 0xE6, 0xDD, 0xDD, 0xD9, 0x99,
0xBB, 0xBB, 0x67, 0x63, 0x6E, 0x0E, 0xEC, 0xCC, 0xDD, 0xDC, 0x99, 0x9F, 0xBB, 0xB9, 0x33, 0x3E
};
void load_rom(const char *fname, const char *sname, int zoom)
{
uint8_t *start_of_rom;
int cart_type;
init_memory();
fp = os_open_file_r(fname);
if (fp == INVALID_FILE_HANDLE)
{
os_perr("Couldn't read ROM file");
exit_err();
}
save = os_open_file_rw(sname);
if (save == INVALID_FILE_HANDLE)
{
save = os_create_file_rw(sname);
if (save == INVALID_FILE_HANDLE)
{
os_close_file(fp);
os_perr("Couldn't create save file");
exit_err();
}
}
start_of_rom = alloc_mem(0x150);
if (start_of_rom == NULL)
{
os_perr("Couldn't allocate memory");
exit_err();
}
os_file_read(fp, 0x150, start_of_rom);
if (memcmp(id, start_of_rom + 0x104, sizeof(id)))
{
os_eprint("Bad ROM!\n");
exit_err();
}
os_print("Loading \"");
for (int i = 0x134; i < 0x143; i++)
{
if (!start_of_rom[i])
break;
os_print("%c", start_of_rom[i]);
}
if (start_of_rom[0x143] & 0x80)
gbc_mode = 1;
else
gbc_mode = 0;
os_print("\", %s...\n", gbc_mode ? "GBC" : "GB");
cart_type = start_of_rom[0x147];
rom_size = start_of_rom[0x148];
ram_size = start_of_rom[0x149];
switch (rom_size)
{
case 0x52:
rom_size = 72;
break;
case 0x53:
rom_size = 80;
break;
case 0x54:
rom_size = 96;
break;
default:
if (rom_size > 6)
{
os_eprint("Invalid ROM size 0x%02X.\n", rom_size);
exit_err();
}
rom_size = 2 << rom_size;
}
switch (ram_size)
{
case 0:
ram_size = 0;
break;
case 1:
case 2:
ram_size = 1;
break;
case 3:
ram_size = 4;
break;
case 4:
ram_size = 16;
break;
default:
os_eprint("Invalid RAM size 0x%02X.\n", ram_size);
exit_err();
}
os_print("%i ROM banks, %i RAM banks.\n", rom_size, ram_size);
#ifdef MAP_BATTERY
os_resize_file(save, ram_size * 8192);
#endif
switch (cart_type)
{
CART_TYPE(0x00, 0, 0, 0, 0, 0);
CART_TYPE(0x01, 1, 0, 0, 0, 0);
CART_TYPE(0x02, 1, 1, 0, 0, 0);
CART_TYPE(0x03, 1, 1, 1, 0, 0);
CART_TYPE(0x05, 2, 0, 0, 0, 0);
CART_TYPE(0x06, 2, 0, 1, 0, 0);
CART_TYPE(0x08, 0, 1, 0, 0, 0);
CART_TYPE(0x09, 0, 1, 1, 0, 0);
CART_TYPE(0x0F, 3, 0, 1, 1, 0);
CART_TYPE(0x10, 3, 1, 1, 1, 0);
CART_TYPE(0x11, 3, 0, 0, 0, 0);
CART_TYPE(0x12, 3, 1, 0, 0, 0);
CART_TYPE(0x13, 3, 1, 1, 0, 0);
CART_TYPE(0x19, 5, 0, 0, 0, 0);
CART_TYPE(0x1A, 5, 1, 0, 0, 0);
CART_TYPE(0x1B, 5, 1, 1, 0, 0);
CART_TYPE(0x1C, 5, 0, 0, 0, 1);
CART_TYPE(0x1D, 5, 1, 0, 0, 1);
CART_TYPE(0x1E, 5, 1, 1, 0, 1);
default:
os_eprint("Unknown cartridge type 0x%02X.\n", cart_type);
exit_err();
}
os_print("Cartridge type: ROM");
if (mbc)
os_print("+MBC%i", mbc);
if (ext_ram)
os_print("+RAM");
if (batt)
os_print("+BATT");
if (rtc)
os_print("+TIMER");
if (rmbl)
os_print("+RUMBLE");
os_print("\n");
load_memory();
run(zoom);
}