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- /* sd2snes - SD card based universal cartridge for the SNES
- Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
- AVR firmware portion
- Inspired by and based on code from sd2iec, written by Ingo Korb et al.
- See sdcard.c|h, config.h.
- FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
- see ff.c|h.
- 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; version 2 of the License only.
- 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
- smc.c: SMC file related operations
- */
- #include "fileops.h"
- #include "config.h"
- #include "uart.h"
- #include "smc.h"
- #include "string.h"
- #include "fpga_spi.h"
- snes_romprops_t romprops;
- uint32_t hdr_addr[6] = {0xffb0, 0x101b0, 0x7fb0, 0x81b0, 0x40ffb0, 0x4101b0};
- uint8_t isFixed(uint8_t* data, int size, uint8_t value) {
- uint8_t res = 1;
- do {
- size--;
- if(data[size] != value) {
- res = 0;
- }
- } while (size);
- return res;
- }
- uint8_t checkChksum(uint16_t cchk, uint16_t chk) {
- uint32_t sum = cchk + chk;
- uint8_t res = 0;
- if(sum==0x0000ffff) {
- res = 1;
- }
- return res;
- }
- void smc_id(snes_romprops_t* props) {
- uint8_t score, maxscore=1, score_idx=2; /* assume LoROM */
- snes_header_t* header = &(props->header);
- props->has_dspx = 0;
- props->has_st0010 = 0;
- props->has_cx4 = 0;
- props->fpga_features = 0;
- props->fpga_conf = NULL;
- for(uint8_t num = 0; num < 6; num++) {
- score = smc_headerscore(hdr_addr[num], header);
- printf("%d: offset = %lX; score = %d\n", num, hdr_addr[num], score); // */
- if(score>=maxscore) {
- score_idx=num;
- maxscore=score;
- }
- }
- if(score_idx & 1) {
- props->offset = 0x200;
- } else {
- props->offset = 0;
- }
- /* restore the chosen one */
- /*dprintf("winner is %d\n", score_idx); */
- file_readblock(header, hdr_addr[score_idx], sizeof(snes_header_t));
- if(header->name[0x13] == 0x00 || header->name[0x13] == 0xff) {
- if(header->name[0x14] == 0x00) {
- const uint8_t n15 = header->map;
- if(n15 == 0x00 || n15 == 0x80 || n15 == 0x84 || n15 == 0x9c
- || n15 == 0xbc || n15 == 0xfc) {
- if(header->licensee == 0x33 || header->licensee == 0xff) {
- props->mapper_id = 0;
- /*XXX do this properly */
- props->ramsize_bytes = 0x8000;
- props->romsize_bytes = 0x100000;
- props->expramsize_bytes = 0;
- props->mapper_id = 3; /* BS-X Memory Map */
- return;
- }
- }
- }
- }
- switch(header->map & 0xef) {
- case 0x21: /* HiROM */
- props->mapper_id = 0;
- if(header->map == 0x31 && (header->carttype == 0x03 || header->carttype == 0x05)) {
- props->has_dspx = 1;
- props->dsp_fw = DSPFW_1B;
- props->fpga_features |= FEAT_DSPX;
- }
- break;
- case 0x20: /* LoROM */
- props->mapper_id = 1;
- if (header->map == 0x20 && header->carttype == 0xf3) {
- props->has_cx4 = 1;
- props->dsp_fw = CX4FW;
- props->fpga_conf = FPGA_CX4;
- props->fpga_features |= FEAT_CX4;
- }
- else if ((header->map == 0x20 && header->carttype == 0x03) ||
- (header->map == 0x30 && header->carttype == 0x05 && header->licensee != 0xb2)) {
- props->has_dspx = 1;
- props->fpga_features |= FEAT_DSPX;
- /* Pilotwings uses DSP1 instead of DSP1B */
- if(!memcmp(header->name, "PILOTWINGS", 10)) {
- props->dsp_fw = DSPFW_1;
- } else {
- props->dsp_fw = DSPFW_1B;
- }
- } else if (header->map == 0x20 && header->carttype == 0x05) {
- props->has_dspx = 1;
- props->dsp_fw = DSPFW_2;
- props->fpga_features |= FEAT_DSPX;
- } else if (header->map == 0x30 && header->carttype == 0x05 && header->licensee == 0xb2) {
- props->has_dspx = 1;
- props->dsp_fw = DSPFW_3;
- props->fpga_features |= FEAT_DSPX;
- } else if (header->map == 0x30 && header->carttype == 0x03) {
- props->has_dspx = 1;
- props->dsp_fw = DSPFW_4;
- props->fpga_features |= FEAT_DSPX;
- } else if (header->map == 0x30 && header->carttype == 0xf6 && header->romsize >= 0xa) {
- props->has_dspx = 1;
- props->has_st0010 = 1;
- props->dsp_fw = DSPFW_ST0010;
- props->fpga_features |= FEAT_ST0010;
- header->ramsize = 2;
- }
- break;
- case 0x25: /* ExHiROM */
- props->mapper_id = 2;
- break;
- case 0x22: /* ExLoROM */
- if(file_handle.fsize > 0x400200) {
- props->mapper_id = 6; /* SO96 */
- } else {
- props->mapper_id = 1;
- }
- break;
- default: /* invalid/unsupported mapper, use header location */
- switch(score_idx) {
- case 0:
- case 1:
- props->mapper_id = 0;
- break;
- case 2:
- case 3:
- if(file_handle.fsize > 0x800200) {
- props->mapper_id = 6; /* SO96 interleaved */
- } else if(file_handle.fsize > 0x400200) {
- props->mapper_id = 1; /* ExLoROM */
- } else {
- props->mapper_id = 1; /* LoROM */
- }
- break;
- case 4:
- case 5:
- props->mapper_id = 2;
- break;
- default:
- props->mapper_id = 1; // whatever
- }
- }
- if(header->romsize == 0 || header->romsize > 13) {
- header->romsize = 13;
- }
- props->ramsize_bytes = (uint32_t)1024 << header->ramsize;
- props->romsize_bytes = (uint32_t)1024 << header->romsize;
- props->expramsize_bytes = (uint32_t)1024 << header->expramsize;
- /*dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes); */
- if(props->ramsize_bytes > 32768 || props->ramsize_bytes < 2048) {
- props->ramsize_bytes = 0;
- }
- props->region = (header->destcode <= 1 || header->destcode >= 13) ? 0 : 1;
- /*dprintf("ramsize_bytes: %ld\n", props->ramsize_bytes); */
- }
- uint8_t smc_headerscore(uint32_t addr, snes_header_t* header) {
- int score=0;
- uint8_t reset_inst;
- uint16_t header_offset;
- if((addr & 0xfff) == 0x1b0) {
- header_offset = 0x200;
- } else {
- header_offset = 0;
- }
- if((file_readblock(header, addr, sizeof(snes_header_t)) < sizeof(snes_header_t))
- || file_res) {
- return 0;
- }
- uint8_t mapper = header->map & ~0x10;
- uint16_t resetvector = header->vect_reset; /* not endian safe! */
- uint32_t file_addr = (((addr - header_offset) & ~0x7fff) | (resetvector & 0x7fff)) + header_offset;
- if(resetvector < 0x8000) return 0;
- score += 2*isFixed(&header->licensee, sizeof(header->licensee), 0x33);
- score += 4*checkChksum(header->cchk, header->chk);
- if(header->carttype < 0x08) score++;
- if(header->romsize < 0x10) score++;
- if(header->ramsize < 0x08) score++;
- if(header->destcode < 0x0e) score++;
- if((addr-header_offset) == 0x007fc0 && mapper == 0x20) score += 2;
- if((addr-header_offset) == 0x00ffc0 && mapper == 0x21) score += 2;
- if((addr-header_offset) == 0x007fc0 && mapper == 0x22) score += 2;
- if((addr-header_offset) == 0x40ffc0 && mapper == 0x25) score += 2;
- file_readblock(&reset_inst, file_addr, 1);
- switch(reset_inst) {
- case 0x78: /* sei */
- case 0x18: /* clc */
- case 0x38: /* sec */
- case 0x9c: /* stz abs */
- case 0x4c: /* jmp abs */
- case 0x5c: /* jml abs */
- score += 8;
- break;
- case 0xc2: /* rep */
- case 0xe2: /* sep */
- case 0xad: /* lda abs */
- case 0xae: /* ldx abs */
- case 0xac: /* ldy abs */
- case 0xaf: /* lda abs long */
- case 0xa9: /* lda imm */
- case 0xa2: /* ldx imm */
- case 0xa0: /* ldy imm */
- case 0x20: /* jsr abs */
- case 0x22: /* jsl abs */
- score += 4;
- break;
- case 0x40: /* rti */
- case 0x60: /* rts */
- case 0x6b: /* rtl */
- case 0xcd: /* cmp abs */
- case 0xec: /* cpx abs */
- case 0xcc: /* cpy abs */
- score -= 4;
- break;
- case 0x00: /* brk */
- case 0x02: /* cop */
- case 0xdb: /* stp */
- case 0x42: /* wdm */
- case 0xff: /* sbc abs long indexed */
- score -= 8;
- break;
- }
- if(score && addr > 0x400000) score += 4;
- if(score < 0) score = 0;
- return score;
- }
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