/* * sdbox.c - Cartridge handling, SD-BOX cart. * * Written by * groepaz * * This file is part of VICE, the Versatile Commodore Emulator. * See README for copyright notice. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA * 02111-1307 USA. * */ /* #define DEBUG_SDBOX */ #include "vice.h" #include #include #define CARTRIDGE_INCLUDE_SLOTMAIN_API #include "c64cartsystem.h" #undef CARTRIDGE_INCLUDE_SLOTMAIN_API #include "c64mem.h" #include "cartio.h" #include "cartridge.h" #include "export.h" #include "sdbox.h" #include "log.h" #include "monitor.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "crt.h" #ifdef DEBUG_SDBOX #define DBG(x) printf x #else #define DBG(x) #endif /* "SD Box" - 128k ROM, 8*16kb banks (16k GAME mode) one register at de00: bit 0-3 ROM bank bit 4 reset SD bit 5 CE ROM bit 6 EXROM bit 7 register enable additionally there are 3 "ram cells" at de01-de03 */ static uint8_t currbank = 0; static uint8_t reg_enable = 1; static uint8_t regval = 0; static uint8_t regs[4]; static uint8_t sdbox_io1_read(uint16_t addr) { addr &= 0xff; if (reg_enable) { switch (addr) { case 0: DBG(("io1 read %02x %02x\n", addr, regs[addr])); return regs[addr]; /* FIXME: is the register readable? */ break; case 1: case 2: case 3: DBG(("io1 read %02x %02x\n", addr, regs[addr])); return regs[addr]; break; default: DBG(("io1 invalid read at %04x\n", addr)); break; } } else { DBG(("io1 read %02x (disabled)\n", addr)); } return 0; } static void sdbox_io1_store(uint16_t addr, uint8_t value) { uint8_t exrom; addr &= 0xff; if (reg_enable) { switch (addr) { case 0: currbank = value & 0xf; exrom = ((value >> 6) ^ 1) & 1; if (exrom) { cart_config_changed_slotmain(CMODE_16KGAME, CMODE_16KGAME | (currbank << CMODE_BANK_SHIFT), CMODE_WRITE); } else { cart_config_changed_slotmain(CMODE_RAM, CMODE_RAM | (currbank << CMODE_BANK_SHIFT), CMODE_WRITE); } reg_enable = (value >> 7) ^ 1; regval = regs[addr] = value; DBG(("io1 write %02x value: $%02x bank: %d exrom: %d\n", addr, value, roml_bank, exrom)); break; case 1: case 2: case 3: regs[addr] = value; DBG(("io1 write %02x value: $%02x\n", addr, value)); break; default: DBG(("io1 invalid write at %04x\n", addr)); break; } } else { DBG(("io1 write %02x value: $%02x (disabled)\n", addr, value)); } } static int sdbox_dump(void) { mon_out("Register: %02x (%s)\n", regval, reg_enable ? "enabled" : "disabled"); mon_out("ROM Bank: %d\n", currbank); mon_out("on chip RAM: %02x %02x %02x\n", regs[1], regs[2], regs[3]); return 0; } /* ---------------------------------------------------------------------*/ static io_source_t sdbox_device = { CARTRIDGE_NAME_SDBOX, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xde00, 0xdeff, 0xff, /* range for the device, address is ignored, reg:$de00, mirrors:$de01-$deff */ 1, /* read is always valid */ sdbox_io1_store, /* store function */ NULL, /* NO poke function */ sdbox_io1_read, /* read function */ NULL, /* NO peek function */ sdbox_dump, /* device state information dump function */ CARTRIDGE_SDBOX, /* cartridge ID */ IO_PRIO_NORMAL, /* normal priority, device read needs to be checked for collisions */ 0, /* insertion order, gets filled in by the registration function */ IO_MIRROR_NONE /* NO mirroring */ }; static io_source_list_t *sdbox_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_NAME_SDBOX, 1, 1, &sdbox_device, NULL, CARTRIDGE_SDBOX }; /* ---------------------------------------------------------------------*/ void sdbox_config_init(void) { /* 16k configuration */ cart_config_changed_slotmain(CMODE_16KGAME, CMODE_16KGAME, CMODE_READ); reg_enable = 1; currbank = 0; } void sdbox_powerup(void) { memset(regs, 0, 4); } void sdbox_config_setup(uint8_t *rawcart) { int i; for (i = 0; i < 8; i++) { memcpy(&roml_banks[i * 0x2000], &rawcart[0x4000 * i], 0x2000); memcpy(&romh_banks[i * 0x2000], &rawcart[0x2000 + (0x4000 * i)], 0x2000); } /* 16k configuration */ cart_config_changed_slotmain(CMODE_16KGAME, CMODE_16KGAME, CMODE_READ); } /* ---------------------------------------------------------------------*/ static int sdbox_common_attach(void) { if (export_add(&export_res) < 0) { return -1; } sdbox_list_item = io_source_register(&sdbox_device); return 0; } int sdbox_bin_attach(const char *filename, uint8_t *rawcart) { if (util_file_load(filename, rawcart, 0x20000, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { return -1; } return sdbox_common_attach(); } int sdbox_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; while (1) { if (crt_read_chip_header(&chip, fd)) { break; } if ((chip.bank > 7) || (chip.start != 0x8000) || (chip.size != 0x4000)) { return -1; } if (crt_read_chip(rawcart, chip.bank << 14, &chip, fd)) { return -1; } } return sdbox_common_attach(); } void sdbox_detach(void) { io_source_unregister(sdbox_list_item); sdbox_list_item = NULL; export_remove(&export_res); } /* ---------------------------------------------------------------------*/ /* CARTSDBOX snapshot module format: type | name | version | description -------------------------------------- BYTE | regval | 1.0 | register BYTE | currbank | 1.0 | current bank BYTE | reg_enable | 1.0 | flag: is the register enabled BYTE | regs | 1.0 | 4 bytes of "RAM" ARRAY | ROML | 1.0 | 8*8k BYTES of ROML data ARRAY | ROMH | 1.0 | 8*8k BYTES of ROMH data */ static const char snap_module_name[] = "CARTSDBOX"; #define SNAP_MAJOR 1 #define SNAP_MINOR 0 int sdbox_snapshot_write_module(snapshot_t *s) { snapshot_module_t *m; m = snapshot_module_create(s, snap_module_name, SNAP_MAJOR, SNAP_MINOR); if (m == NULL) { return -1; } if (0 || SMW_B(m, regval) < 0 || SMW_B(m, (uint8_t)currbank) < 0 || SMW_B(m, reg_enable) < 0 || SMW_BA(m, regs, 4) < 0 || SMW_BA(m, roml_banks, 0x2000 * 8) < 0 || SMW_BA(m, romh_banks, 0x2000 * 8) < 0) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int sdbox_snapshot_read_module(snapshot_t *s) { uint8_t vmajor, vminor; snapshot_module_t *m; m = snapshot_module_open(s, snap_module_name, &vmajor, &vminor); if (m == NULL) { return -1; } /* Do not accept versions higher than current */ if (snapshot_version_is_bigger(vmajor, vminor, SNAP_MAJOR, SNAP_MINOR)) { snapshot_set_error(SNAPSHOT_MODULE_HIGHER_VERSION); goto fail; } /* Only accept compatible snapshots */ if (snapshot_version_is_smaller(vmajor, vminor, 1, 0)) { snapshot_set_error(SNAPSHOT_MODULE_INCOMPATIBLE); goto fail; } if (0 || SMR_B(m, ®val) < 0 || SMR_B(m, &currbank) < 0 || SMR_B(m, ®_enable) < 0 || SMR_BA(m, regs, 4) < 0 || SMR_BA(m, roml_banks, 0x2000 * 8) < 0 || SMR_BA(m, romh_banks, 0x2000 * 8) < 0) { goto fail; } snapshot_module_close(m); return sdbox_common_attach(); fail: snapshot_module_close(m); return -1; }