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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 */
- props->region = 0; /* BS-X only existed in Japan */
- 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 )
- {
- props->romsize_bytes = 1024;
- header->romsize = 0;
- if ( file_handle.fsize >= 1024 )
- {
- while ( props->romsize_bytes < file_handle.fsize - 1 )
- {
- header->romsize++;
- props->romsize_bytes <<= 1;
- }
- }
- }
- 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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