ref: b856b80b7349eba3853fcde0f2f1956419e4cfeb
dir: /psx/dev/cdrom.c/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "cdrom.h"
#include "../log.h"
#include "../msf.h"
/*
Drive Status 1st Response 2nd Response
Door Open INT5(11h,80h) N/A
Spin-up INT5(01h,80h) N/A
Detect busy INT5(03h,80h) N/A
No Disk INT3(stat) INT5(08h,40h, 00h,00h, 00h,00h,00h,00h)
Audio Disk INT3(stat) INT5(0Ah,90h, 00h,00h, 00h,00h,00h,00h)
Unlicensed:Mode1 INT3(stat) INT5(0Ah,80h, 00h,00h, 00h,00h,00h,00h)
Unlicensed:Mode2 INT3(stat) INT5(0Ah,80h, 20h,00h, 00h,00h,00h,00h)
Unlicensed:Mode2+Audio INT3(stat) INT5(0Ah,90h, 20h,00h, 00h,00h,00h,00h)
Debug/Yaroze:Mode2 INT3(stat) INT2(02h,00h, 20h,00h, 20h,20h,20h,20h)
Licensed:Mode2 INT3(stat) INT2(02h,00h, 20h,00h, 53h,43h,45h,4xh)
Modchip:Audio/Mode1 INT3(stat) INT2(02h,00h, 00h,00h, 53h,43h,45h,4xh)
*/
#define GETID_RESPONSE_SIZE 8
#define GETID_RESPONSE_END (GETID_RESPONSE_SIZE - 1)
static const uint8_t g_getid_no_disc[] = {
0x08, 0x40, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
static const uint8_t g_getid_audio[] = {
0x0a, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
static const uint8_t g_getid_unlicensed[] = {
0x0a, 0x80, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
static const uint8_t g_getid_licensed[] = {
0x02, 0x00, 0x20, 0x00,
'S' , 'C' , 'E' , 'A'
};
#define RESP_PUSH(data) { \
cdrom->rfifo[cdrom->rfifo_index++] = data; \
cdrom->rfifo_index &= 15; \
SET_BITS(status, STAT_RSLRRDY_MASK, STAT_RSLRRDY_MASK); }
#define PFIFO_POP (cdrom->pfifo[--cdrom->pfifo_index])
#define VALID_BCD(v) (((v & 0xf) <= 9) && ((v & 0xf0) <= 0x90))
void cdrom_cmd_error(psx_cdrom_t* cdrom) {
SET_BITS(ifr, IFR_INT, IFR_INT5);
RESP_PUSH(cdrom->error);
RESP_PUSH(GETSTAT_MOTOR | cdrom->error_flags);
cdrom->pfifo_index = 0;
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
}
void cdrom_cmd_unimplemented(psx_cdrom_t* cdrom) {
log_fatal("Unimplemented CDROM command (%u)", cdrom->command);
exit(1);
}
void cdrom_cmd_getstat(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index) {
log_fatal("CdlGetStat: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_GETSTAT;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR | (cdrom->disc ? 0 : GETSTAT_TRAYOPEN));
if (cdrom->read_ongoing) {
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_READN;
cdrom->irq_delay = DELAY_1MS;
} else {
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
}
} break;
}
}
void cdrom_cmd_setloc(psx_cdrom_t* cdrom) {
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index != 3) {
log_fatal("CdlSetloc: Expected exactly 3 parameters, got %u instead",
cdrom->pfifo_index
);
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
if (!cdrom->read_ongoing) {
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_SETLOC;
cdrom->state = CD_STATE_SEND_RESP1;
} else {
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_READN;
cdrom->state = CD_STATE_SEND_RESP2;
}
int f = PFIFO_POP;
int s = PFIFO_POP;
int m = PFIFO_POP;
if (!(VALID_BCD(m) && VALID_BCD(s) && VALID_BCD(f) && (f < 0x75))) {
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_INVSUBF;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->seek_ff = f;
cdrom->seek_ss = s;
cdrom->seek_mm = m;
cdrom->seek_pending = 1;
log_fatal("setloc: %02x:%02x:%02x",
cdrom->seek_mm,
cdrom->seek_ss,
cdrom->seek_ff
);
} break;
case CD_STATE_SEND_RESP1: {
cdrom->delayed_command = CDL_NONE;
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
} break;
// Read ongoing
case CD_STATE_SEND_RESP2: {
int f = PFIFO_POP;
int s = PFIFO_POP;
int m = PFIFO_POP;
if (!(VALID_BCD(m) && VALID_BCD(s) && VALID_BCD(f) && (f < 0x75))) {
cdrom->read_ongoing = false;
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_INVSUBF;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->seek_ff = f;
cdrom->seek_ss = s;
cdrom->seek_mm = m;
} break;
}
}
void cdrom_cmd_play(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
int track = 0;
// Optional track number parameter
if (cdrom->pfifo_index)
track = PFIFO_POP;
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_PLAY;
if (track) {
psx_disc_get_track_addr(cdrom->disc, &cdrom->cdda_msf, track);
msf_to_bcd(&cdrom->cdda_msf);
cdrom->cdda_track = track;
cdrom->seek_mm = cdrom->cdda_msf.m;
cdrom->seek_ss = cdrom->cdda_msf.s;
cdrom->seek_ff = cdrom->cdda_msf.f;
cdrom->seek_pending = 1;
}
if (cdrom->seek_pending) {
cdrom->seek_pending = 0;
cdrom->cdda_msf.m = cdrom->seek_mm;
cdrom->cdda_msf.s = cdrom->seek_ss;
cdrom->cdda_msf.f = cdrom->seek_ff;
// Convert seek to I
msf_t msf = cdrom->cdda_msf;
msf_from_bcd(&msf);
// Seek to that address and read sector
psx_disc_seek(cdrom->disc, msf);
psx_disc_read_sector(cdrom->disc, cdrom->cdda_buf);
// Increment sector
msf_add_f(&msf, 1);
msf_to_bcd(&msf);
cdrom->cdda_msf = msf;
cdrom->cdda_sector_offset = 0;
}
cdrom->cdda_playing = 1;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_PLAY);
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_readn(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
cdrom->read_ongoing = 1;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
log_fatal("CdlReadN: CD_STATE_RECV_CMD");
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_READN;
} break;
case CD_STATE_SEND_RESP1: {
log_fatal("CdlReadN: CD_STATE_SEND_RESP1");
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR);
msf_t msf;
msf.m = cdrom->seek_mm;
msf.s = cdrom->seek_ss;
msf.f = cdrom->seek_ff;
msf_from_bcd(&msf);
int err = psx_disc_seek(cdrom->disc, msf);
if (err) {
log_fatal("CdlReadN: Out of bounds seek");
cdrom->irq_delay = DELAY_1MS * 600;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_INVSUBF;
cdrom->error_flags = GETSTAT_SEEKERROR;
return;
}
psx_disc_read_sector(cdrom->disc, cdrom->dfifo);
msf_t sector_msf;
sector_msf.m = cdrom->dfifo[0x0c];
sector_msf.s = cdrom->dfifo[0x0d];
sector_msf.f = cdrom->dfifo[0x0e];
int correct_msf = (cdrom->seek_mm == sector_msf.m) &&
(cdrom->seek_ss == sector_msf.s) &&
(cdrom->seek_ff == sector_msf.f);
// Most probably audio sector:
// Purposefully constructed audio data could
// circumvent this detection code, but it will work
// for most intents and purposes
if (!correct_msf) {
log_fatal("CdlReadN: Audio read");
cdrom->irq_delay = DELAY_1MS * 600;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_SEEK;
cdrom->error_flags = GETSTAT_SEEKERROR;
return;
}
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = double_speed ? READ_DOUBLE_DELAY : READ_SINGLE_DELAY;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_READN;
if (cdrom->spin_delay) {
cdrom->irq_delay += cdrom->spin_delay;
cdrom->spin_delay = 0;
}
} break;
case CD_STATE_SEND_RESP2: {
log_fatal("CdlReadN: CD_STATE_SEND_RESP2");
msf_t msf;
msf.m = cdrom->seek_mm;
msf.s = cdrom->seek_ss;
msf.f = cdrom->seek_ff;
msf_from_bcd(&msf);
psx_disc_seek(cdrom->disc, msf);
psx_disc_read_sector(cdrom->disc, cdrom->dfifo);
// printf("Sector header: msf=%02x:%02x:%02x, mode=%02x, subheader=%02x,%02x,%02x,%02x\n",
// cdrom->dfifo[0x0c],
// cdrom->dfifo[0x0d],
// cdrom->dfifo[0x0e],
// cdrom->dfifo[0x0f],
// cdrom->dfifo[0x10],
// cdrom->dfifo[0x11],
// cdrom->dfifo[0x12],
// cdrom->dfifo[0x13]
// );
if (cdrom->dfifo[0x12] & 0x20) {
log_fatal("Unimplemented XA Form2 Sector");
// exit(1);
}
cdrom->seek_ff++;
if ((cdrom->seek_ff & 0xF) == 10) { cdrom->seek_ff += 0x10; cdrom->seek_ff &= 0xF0; }
if (cdrom->seek_ff == 0x75) { cdrom->seek_ss++; cdrom->seek_ff = 0; }
if ((cdrom->seek_ss & 0xF) == 10) { cdrom->seek_ss += 0x10; cdrom->seek_ss &= 0xF0; }
if (cdrom->seek_ss == 0x60) { cdrom->seek_mm++; cdrom->seek_ss = 0; }
if ((cdrom->seek_mm & 0xF) == 10) { cdrom->seek_mm += 0x10; cdrom->seek_mm &= 0xF0; }
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = double_speed ? READ_DOUBLE_DELAY : READ_SINGLE_DELAY;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_READN;
cdrom->dfifo_index = 0;
SET_BITS(ifr, IFR_INT, IFR_INT1);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_READ);
} break;
}
}
void cdrom_cmd_motoron(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->read_ongoing = 0;
cdrom->cdda_playing = 0;
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_MOTORON;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_READ);
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = DELAY_1MS * (double_speed ? 70 : 65);
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_MOTORON;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_stop(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->read_ongoing = 0;
cdrom->cdda_playing = 0;
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_STOP;
cdrom->seek_ff = 0;
cdrom->seek_ss = 0;
cdrom->seek_mm = 0;
cdrom->cdda_msf.m = 0;
cdrom->cdda_msf.s = 0;
cdrom->cdda_msf.f = 0;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_READ);
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = DELAY_1MS * (double_speed ? 70 : 65);
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_STOP;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_pause(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->read_ongoing = 0;
cdrom->cdda_playing = 0;
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_PAUSE;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_READ);
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = DELAY_1MS * (double_speed ? 70 : 65);
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_PAUSE;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_init(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_INIT;
cdrom->read_ongoing = 0;
cdrom->mode = 0;
cdrom->dfifo_index = 0;
cdrom->dfifo_full = 0;
cdrom->pfifo_index = 0;
cdrom->rfifo_index = 0;
cdrom->seek_mm = 0;
cdrom->seek_ss = 0;
cdrom->seek_ff = 0;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(cdrom->stat);
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_INIT;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(cdrom->stat);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_unmute(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index) {
log_fatal("CdlUnmute: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_DEMUTE;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(cdrom->stat);
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_setfilter(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index != 2) {
log_fatal("CdlSetfilter: Expected exactly 2 parameter");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->pfifo_index = 0;
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_SETFILTER;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
cdrom->delayed_command = CDL_NONE;
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(cdrom->stat);
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_setmode(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index != 1) {
log_fatal("CdlSetmode: Expected exactly 1 parameter");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
int prev_speed = cdrom->mode & MODE_SPEED;
cdrom->mode = PFIFO_POP;
if ((cdrom->mode & MODE_SPEED) != prev_speed)
cdrom->spin_delay = DELAY_1MS * 650;
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_SETMODE;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
cdrom->delayed_command = CDL_NONE;
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_getlocl(psx_cdrom_t* cdrom) { log_fatal("getlocl: Unimplemented"); exit(1); }
void cdrom_cmd_getlocp(psx_cdrom_t* cdrom) {
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_GETLOCP;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(0x00);
RESP_PUSH(0x00);
RESP_PUSH(0x00);
RESP_PUSH(0x00);
RESP_PUSH(0x00);
RESP_PUSH(0x00);
RESP_PUSH(0x01);
RESP_PUSH(0xff);
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_gettn(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index) {
log_fatal("CdlGetTN: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_GETTN;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
int tn;
psx_disc_get_track_count(cdrom->disc, &tn);
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(tn);
RESP_PUSH(0x01);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_gettd(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index != 1) {
log_fatal("CdlGetTD: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->gettd_track = PFIFO_POP;
int err = psx_disc_get_track_addr(cdrom->disc, NULL, cdrom->gettd_track);
if (err) {
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_GETTD;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
msf_t td;
psx_disc_get_track_addr(cdrom->disc, &td, cdrom->gettd_track);
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(ITOB(td.s));
RESP_PUSH(ITOB(td.m));
RESP_PUSH(GETSTAT_MOTOR);
cdrom->delayed_command = CDL_NONE;
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_seekl(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index) {
log_fatal("CdlSeekL: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_SEEKL;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_SEEKL;
msf_t msf;
msf.m = cdrom->seek_mm;
msf.s = cdrom->seek_ss;
msf.f = cdrom->seek_ff;
msf_from_bcd(&msf);
psx_disc_seek(cdrom->disc, msf);
cdrom->seek_pending = 0;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_seekp(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_SEEKP;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_SEEKP;
} break;
case CD_STATE_SEND_RESP2: {
SET_BITS(ifr, IFR_INT, 2);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_test(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index != 1) {
log_fatal("CdlTest: Expected exactly 1 parameter");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
if (PFIFO_POP != 0x20) {
log_fatal("CdlTest: Unhandled subcommand");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_INVSUBF;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_TEST;
cdrom->state = CD_STATE_SEND_RESP1;
} break;
case CD_STATE_SEND_RESP1: {
cdrom->delayed_command = CDL_NONE;
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(0x01);
RESP_PUSH(0x95);
RESP_PUSH(0x13);
RESP_PUSH(0x03);
cdrom->state = CD_STATE_RECV_CMD;
} break;
}
}
void cdrom_cmd_getid(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
if (cdrom->pfifo_index) {
log_fatal("CdlGetID: Expected exactly 0 parameters");
cdrom->irq_delay = DELAY_1MS;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_PCOUNT;
cdrom->error_flags = GETSTAT_ERROR;
return;
}
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_GETID;
} break;
case CD_STATE_SEND_RESP1: {
SET_BITS(ifr, IFR_INT, 3);
RESP_PUSH(GETSTAT_MOTOR);
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_GETID;
} break;
case CD_STATE_SEND_RESP2: {
if (cdrom->disc) {
SET_BITS(ifr, IFR_INT, 2);
switch (cdrom->cd_type) {
case CDT_LICENSED: {
for (int i = 0; i < GETID_RESPONSE_SIZE; i++)
RESP_PUSH(g_getid_licensed[GETID_RESPONSE_END - i]);
} break;
case CDT_AUDIO: {
for (int i = 0; i < GETID_RESPONSE_SIZE; i++)
RESP_PUSH(g_getid_audio[GETID_RESPONSE_END - i]);
} break;
case CDT_UNKNOWN: {
for (int i = 0; i < GETID_RESPONSE_SIZE; i++)
RESP_PUSH(g_getid_unlicensed[GETID_RESPONSE_END - i]);
} break;
}
} else {
SET_BITS(ifr, IFR_INT, 5);
for (int i = 0; i < GETID_RESPONSE_SIZE; i++)
RESP_PUSH(g_getid_no_disc[GETID_RESPONSE_END - i]);
}
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
} break;
}
}
void cdrom_cmd_reads(psx_cdrom_t* cdrom) {
cdrom->delayed_command = CDL_NONE;
cdrom->read_ongoing = 1;
switch (cdrom->state) {
case CD_STATE_RECV_CMD: {
log_fatal("CdlReadS: CD_STATE_RECV_CMD");
cdrom->irq_delay = DELAY_1MS;
cdrom->state = CD_STATE_SEND_RESP1;
cdrom->delayed_command = CDL_READS;
} break;
case CD_STATE_SEND_RESP1: {
log_fatal("CdlReadS: CD_STATE_SEND_RESP1");
SET_BITS(ifr, IFR_INT, IFR_INT3);
RESP_PUSH(GETSTAT_MOTOR);
msf_t msf;
msf.m = cdrom->seek_mm;
msf.s = cdrom->seek_ss;
msf.f = cdrom->seek_ff;
msf_from_bcd(&msf);
int err = psx_disc_seek(cdrom->disc, msf);
if (err) {
log_fatal("CdlReadS: Out of bounds seek");
cdrom->irq_delay = DELAY_1MS * 600;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_INVSUBF;
cdrom->error_flags = GETSTAT_SEEKERROR;
return;
}
psx_disc_read_sector(cdrom->disc, cdrom->dfifo);
msf_t sector_msf;
sector_msf.m = cdrom->dfifo[0x0c];
sector_msf.s = cdrom->dfifo[0x0d];
sector_msf.f = cdrom->dfifo[0x0e];
int correct_msf = (cdrom->seek_mm == sector_msf.m) &&
(cdrom->seek_ss == sector_msf.s) &&
(cdrom->seek_ff == sector_msf.f);
// Most probably audio sector:
// Purposefully constructed audio data could
// circumvent this detection code, but it will work
// for most intents and purposes
if (!correct_msf) {
log_fatal("CdlReadS: Audio read");
cdrom->irq_delay = DELAY_1MS * 600;
cdrom->delayed_command = CDL_ERROR;
cdrom->state = CD_STATE_ERROR;
cdrom->error = ERR_SEEK;
cdrom->error_flags = GETSTAT_SEEKERROR;
return;
}
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = double_speed ? READ_DOUBLE_DELAY : READ_SINGLE_DELAY;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_READS;
if (cdrom->spin_delay) {
cdrom->irq_delay += cdrom->spin_delay;
cdrom->spin_delay = 0;
}
} break;
case CD_STATE_SEND_RESP2: {
log_fatal("CdlReadS: CD_STATE_SEND_RESP2");
msf_t msf;
msf.m = cdrom->seek_mm;
msf.s = cdrom->seek_ss;
msf.f = cdrom->seek_ff;
msf_from_bcd(&msf);
psx_disc_seek(cdrom->disc, msf);
psx_disc_read_sector(cdrom->disc, cdrom->dfifo);
if (cdrom->mode & MODE_XA_ADPCM) {
cdrom->state = CD_STATE_RECV_CMD;
cdrom->delayed_command = CDL_NONE;
return;
}
if (cdrom->dfifo[0x12] & 0x20) {
log_fatal("Unimplemented XA Form2 Sector");
// exit(1);
}
cdrom->seek_ff++;
if ((cdrom->seek_ff & 0xF) == 10) { cdrom->seek_ff += 0x10; cdrom->seek_ff &= 0xF0; }
if (cdrom->seek_ff == 0x75) { cdrom->seek_ss++; cdrom->seek_ff = 0; }
if ((cdrom->seek_ss & 0xF) == 10) { cdrom->seek_ss += 0x10; cdrom->seek_ss &= 0xF0; }
if (cdrom->seek_ss == 0x60) { cdrom->seek_mm++; cdrom->seek_ss = 0; }
if ((cdrom->seek_mm & 0xF) == 10) { cdrom->seek_mm += 0x10; cdrom->seek_mm &= 0xF0; }
int double_speed = cdrom->mode & MODE_SPEED;
cdrom->irq_delay = double_speed ? READ_DOUBLE_DELAY : READ_SINGLE_DELAY;
cdrom->state = CD_STATE_SEND_RESP2;
cdrom->delayed_command = CDL_READS;
cdrom->dfifo_index = 0;
SET_BITS(ifr, IFR_INT, IFR_INT1);
RESP_PUSH(GETSTAT_MOTOR | GETSTAT_READ);
} break;
}
}
void cdrom_cmd_readtoc(psx_cdrom_t* cdrom) { log_fatal("readtoc: Unimplemented"); exit(1); }
typedef void (*cdrom_cmd_t)(psx_cdrom_t*);
const char* g_psx_cdrom_command_names[] = {
"CdlUnimplemented",
"CdlGetstat",
"CdlSetloc",
"CdlPlay",
"CdlUnimplemented",
"CdlUnimplemented",
"CdlReadn",
"CdlMotoron",
"CdlStop",
"CdlPause",
"CdlInit",
"CdlUnimplemented",
"CdlUnmute",
"CdlSetfilter",
"CdlSetmode",
"CdlUnimplemented",
"CdlGetlocl",
"CdlGetlocp",
"CdlUnimplemented",
"CdlGettn",
"CdlGettd",
"CdlSeekl",
"CdlSeekp",
"CdlUnimplemented",
"CdlUnimplemented",
"CdlTest",
"CdlGetid",
"CdlReads",
"CdlUnimplemented",
"CdlUnimplemented",
"CdlReadtoc",
"CdlUnimplemented"
};
cdrom_cmd_t g_psx_cdrom_command_table[] = {
cdrom_cmd_unimplemented,
cdrom_cmd_getstat,
cdrom_cmd_setloc,
cdrom_cmd_play,
cdrom_cmd_unimplemented,
cdrom_cmd_unimplemented,
cdrom_cmd_readn,
cdrom_cmd_motoron,
cdrom_cmd_stop,
cdrom_cmd_pause,
cdrom_cmd_init,
cdrom_cmd_unimplemented,
cdrom_cmd_unmute,
cdrom_cmd_setfilter,
cdrom_cmd_setmode,
cdrom_cmd_unimplemented,
cdrom_cmd_getlocl,
cdrom_cmd_getlocp,
cdrom_cmd_unimplemented,
cdrom_cmd_gettn,
cdrom_cmd_gettd,
cdrom_cmd_seekl,
cdrom_cmd_seekp,
cdrom_cmd_unimplemented,
cdrom_cmd_unimplemented,
cdrom_cmd_test,
cdrom_cmd_getid,
cdrom_cmd_reads,
cdrom_cmd_unimplemented,
cdrom_cmd_unimplemented,
cdrom_cmd_readtoc,
// Actually an unimplemented command, we use this
// index for CD error handling
cdrom_cmd_error
};
typedef uint8_t (*psx_cdrom_read_function_t)(psx_cdrom_t*);
typedef void (*psx_cdrom_write_function_t)(psx_cdrom_t*, uint8_t);
uint8_t cdrom_read_status(psx_cdrom_t* cdrom) {
return cdrom->status;
}
uint8_t cdrom_read_rfifo(psx_cdrom_t* cdrom) {
uint8_t data = cdrom->rfifo[--cdrom->rfifo_index];
if (cdrom->rfifo_index == 0)
SET_BITS(status, STAT_RSLRRDY_MASK, 0);
return data;
}
uint8_t cdrom_read_dfifo(psx_cdrom_t* cdrom) {
if (!cdrom->dfifo_full)
return 0;
int sector_size_bit = cdrom->mode & MODE_SECTOR_SIZE;
uint32_t sector_size = sector_size_bit ? 0x924 : 0x800;
uint32_t offset = sector_size_bit ? 12 : 24;
if (cdrom->dfifo_index < sector_size) {
SET_BITS(status, STAT_DRQSTS_MASK, STAT_DRQSTS_MASK);
return cdrom->dfifo[offset + (cdrom->dfifo_index++)];
} else {
SET_BITS(status, STAT_DRQSTS_MASK, 0);
cdrom->dfifo_full = 0;
}
return 0x00;
}
uint8_t cdrom_read_ier(psx_cdrom_t* cdrom) {
return cdrom->ier;
}
uint8_t cdrom_read_ifr(psx_cdrom_t* cdrom) {
return 0xe0 | cdrom->ifr;
}
void cdrom_write_status(psx_cdrom_t* cdrom, uint8_t value) {
SET_BITS(status, STAT_INDEX_MASK, value);
}
void cdrom_write_cmd(psx_cdrom_t* cdrom, uint8_t value) {
// log_set_quiet(0);
log_fatal("%s(%02x) %u params=[%02x, %02x, %02x, %02x, %02x, %02x]",
g_psx_cdrom_command_names[value],
value,
cdrom->pfifo_index,
cdrom->pfifo[0],
cdrom->pfifo[1],
cdrom->pfifo[2],
cdrom->pfifo[3],
cdrom->pfifo[4],
cdrom->pfifo[5]
);
// log_set_quiet(1);
cdrom->command = value;
cdrom->state = CD_STATE_RECV_CMD;
g_psx_cdrom_command_table[value](cdrom);
}
void cdrom_write_pfifo(psx_cdrom_t* cdrom, uint8_t value) {
cdrom->pfifo[(cdrom->pfifo_index++) & 0xf] = value;
SET_BITS(status, STAT_PRMWRDY_MASK, (cdrom->pfifo_index & 0x10) ? 0x0 : 0xff);
cdrom->pfifo_index &= 0x1f;
}
void cdrom_write_req(psx_cdrom_t* cdrom, uint8_t value) {
if (value & REQ_BFRD) {
SET_BITS(status, STAT_DRQSTS_MASK, STAT_DRQSTS_MASK);
cdrom->dfifo_full = 1;
cdrom->dfifo_index = 0;
} else {
SET_BITS(status, STAT_DRQSTS_MASK, 0);
cdrom->dfifo_full = 0;
cdrom->dfifo_index = 0;
}
}
void cdrom_write_smdout(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Sound map data out unimplemented");
}
void cdrom_write_ier(psx_cdrom_t* cdrom, uint8_t value) {
cdrom->ier = value;
}
void cdrom_write_ifr(psx_cdrom_t* cdrom, uint8_t value) {
cdrom->ifr &= ~(value & 0x7);
// Clear Parameter FIFO
if (value & 0x40) {
cdrom->pfifo_index = 0;
SET_BITS(
status,
(STAT_PRMEMPT_MASK | STAT_PRMWRDY_MASK),
(STAT_PRMEMPT_MASK | STAT_PRMWRDY_MASK)
);
}
}
void cdrom_write_sminfo(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Sound map coding info unimplemented");
}
void cdrom_write_lcdlspuv(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Volume registers unimplemented");
}
void cdrom_write_rcdrspuv(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Volume registers unimplemented");
}
void cdrom_write_rcdlspuv(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Volume registers unimplemented");
}
void cdrom_write_lcdrspuv(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Volume registers unimplemented");
}
void cdrom_write_volume(psx_cdrom_t* cdrom, uint8_t value) {
log_fatal("Volume registers unimplemented");
}
psx_cdrom_read_function_t g_psx_cdrom_read_table[] = {
cdrom_read_status, cdrom_read_rfifo, cdrom_read_dfifo, cdrom_read_ier,
cdrom_read_status, cdrom_read_rfifo, cdrom_read_dfifo, cdrom_read_ifr,
cdrom_read_status, cdrom_read_rfifo, cdrom_read_dfifo, cdrom_read_ier,
cdrom_read_status, cdrom_read_rfifo, cdrom_read_dfifo, cdrom_read_ifr
};
psx_cdrom_write_function_t g_psx_cdrom_write_table[] = {
cdrom_write_status, cdrom_write_cmd , cdrom_write_pfifo , cdrom_write_req ,
cdrom_write_status, cdrom_write_smdout , cdrom_write_ier , cdrom_write_ifr ,
cdrom_write_status, cdrom_write_sminfo , cdrom_write_lcdlspuv, cdrom_write_lcdrspuv,
cdrom_write_status, cdrom_write_rcdrspuv, cdrom_write_rcdlspuv, cdrom_write_volume
};
const char* g_psx_cdrom_read_names_table[] = {
"cdrom_read_status", "cdrom_read_rfifo", "cdrom_read_dfifo", "cdrom_read_ier",
"cdrom_read_status", "cdrom_read_rfifo", "cdrom_read_dfifo", "cdrom_read_ifr",
"cdrom_read_status", "cdrom_read_rfifo", "cdrom_read_dfifo", "cdrom_read_ier",
"cdrom_read_status", "cdrom_read_rfifo", "cdrom_read_dfifo", "cdrom_read_ifr"
};
const char* g_psx_cdrom_write_names_table[] = {
"cdrom_write_status", "cdrom_write_cmd" , "cdrom_write_pfifo" , "cdrom_write_req" ,
"cdrom_write_status", "cdrom_write_smdout" , "cdrom_write_ier" , "cdrom_write_ifr" ,
"cdrom_write_status", "cdrom_write_sminfo" , "cdrom_write_lcdlspuv", "cdrom_write_lcdrspuv",
"cdrom_write_status", "cdrom_write_rcdrspuv", "cdrom_write_rcdlspuv", "cdrom_write_volume"
};
psx_cdrom_t* psx_cdrom_create() {
return (psx_cdrom_t*)malloc(sizeof(psx_cdrom_t));
}
void psx_cdrom_init(psx_cdrom_t* cdrom, psx_ic_t* ic) {
memset(cdrom, 0, sizeof(psx_cdrom_t));
cdrom->io_base = PSX_CDROM_BEGIN;
cdrom->io_size = PSX_CDROM_SIZE;
cdrom->ic = ic;
cdrom->status = STAT_PRMEMPT_MASK | STAT_PRMWRDY_MASK;
cdrom->dfifo = malloc(CD_SECTOR_SIZE);
cdrom->cdda_buf = malloc(CD_SECTOR_SIZE);
}
uint32_t psx_cdrom_read32(psx_cdrom_t* cdrom, uint32_t offset) {
log_fatal("Unhandled 32-bit CDROM read at offset %08x", offset);
return 0x0;
}
uint16_t psx_cdrom_read16(psx_cdrom_t* cdrom, uint32_t offset) {
log_fatal("Unhandled 16-bit CDROM read at offset %08x", offset);
return 0x0;
}
uint8_t psx_cdrom_read8(psx_cdrom_t* cdrom, uint32_t offset) {
uint8_t data = g_psx_cdrom_read_table[(STAT_INDEX << 2) | offset](cdrom);
// log_fatal("%s (read %02x)", g_psx_cdrom_read_names_table[(STAT_INDEX << 2) | offset], data);
return data;
}
void psx_cdrom_write32(psx_cdrom_t* cdrom, uint32_t offset, uint32_t value) {
log_fatal("Unhandled 32-bit CDROM write at offset %08x (%08x)", offset, value);
}
void psx_cdrom_write16(psx_cdrom_t* cdrom, uint32_t offset, uint16_t value) {
log_fatal("Unhandled 16-bit CDROM write at offset %08x (%04x)", offset, value);
}
void psx_cdrom_write8(psx_cdrom_t* cdrom, uint32_t offset, uint8_t value) {
// log_fatal("%s (write %02x)", g_psx_cdrom_write_names_table[(STAT_INDEX << 2) | offset], value);
g_psx_cdrom_write_table[(STAT_INDEX << 2) | offset](cdrom, value);
}
void psx_cdrom_update(psx_cdrom_t* cdrom) {
if (cdrom->irq_delay) {
cdrom->irq_delay -= 2;
if (cdrom->irq_delay <= 0) {
if (cdrom->int_number) {
SET_BITS(ifr, IFR_INT, cdrom->int_number);
cdrom->int_number = 0;
}
log_fatal("CDROM INT%u", cdrom->ifr & 0x7);
psx_ic_irq(cdrom->ic, IC_CDROM);
cdrom->irq_delay = 0;
if (cdrom->delayed_command) {
g_psx_cdrom_command_table[cdrom->delayed_command](cdrom);
}
}
}
}
const char* g_psx_cdrom_extensions[] = {
"cue",
"bin",
0
};
enum {
CD_EXT_CUE,
CD_EXT_BIN,
CD_EXT_UNSUPPORTED
};
int cdrom_get_extension(const char* path) {
const char* ptr = &path[strlen(path) - 1];
int i = 0;
while ((*ptr != '.') && (ptr != path))
ptr--;
if (ptr == path)
return CD_EXT_UNSUPPORTED;
while (g_psx_cdrom_extensions[i]) {
if (!strcmp(ptr + 1, g_psx_cdrom_extensions[i]))
return i;
++i;
}
return CD_EXT_UNSUPPORTED;
}
void cdrom_check_cd_type(psx_cdrom_t* cdrom) {
char buf[CD_SECTOR_SIZE];
// Seek to Primary Volume Descriptor
msf_t pvd = { 0, 2, 16 };
// If the disc is smaller than 16 sectors
// then it can't be a PlayStation game.
// Audio discs should also have ISO volume
// descriptors, so it's probably something else
// entirely.
if (psx_disc_seek(cdrom->disc, pvd)) {
cdrom->cd_type = CDT_UNKNOWN;
return;
}
psx_disc_read_sector(cdrom->disc, buf);
// Check for the "PLAYSTATION" string at PVD offset 20h
// Patch 20 byte so comparison is done correctly
buf[0x2b] = 0;
if (strncmp(&buf[0x20], "PLAYSTATION", 12)) {
cdrom->cd_type = CDT_AUDIO;
return;
}
cdrom->cd_type = CDT_LICENSED;
}
void psx_cdrom_open(psx_cdrom_t* cdrom, const char* path) {
cdrom->disc = psx_disc_create();
int ext = cdrom_get_extension(path);
int error = 0;
switch (ext) {
case CD_EXT_CUE: {
psxd_cue_t* cue = psxd_cue_create();
psxd_cue_init_disc(cue, cdrom->disc);
psxd_cue_init(cue);
error = psxd_cue_load(cue, path);
if (error)
break;
cdrom_check_cd_type(cdrom);
} break;
case CD_EXT_BIN: {
psxd_bin_t* bin = psxd_bin_create();
psxd_bin_init_disc(bin, cdrom->disc);
psxd_bin_init(bin);
error = psxd_bin_load(bin, path);
if (error)
break;
cdrom_check_cd_type(cdrom);
} break;
case CD_EXT_UNSUPPORTED: {
log_fatal("Unsupported disc format");
cdrom->cd_type = CDT_UNKNOWN;
} break;
}
if (error) {
log_fatal("Error loading file \'%s\'", path);
exit(1);
}
}
void psx_cdrom_get_cdda_samples(psx_cdrom_t* cdrom, void* buf, int size, psx_spu_t* spu) {
if (!cdrom->cdda_playing) {
memset(buf, 0, size);
return;
}
if (!cdrom->disc)
return;
// Convert seek to I
msf_t msf = cdrom->cdda_msf;
msf_from_bcd(&msf);
// Seek to that address and read sector
if (psx_disc_seek(cdrom->disc, msf)) {
cdrom->cdda_playing = 0;
}
psx_disc_read_sector(cdrom->disc, cdrom->cdda_buf);
++cdrom->cdda_sectors_played;
// Increment sector
msf_add_f(&msf, 1);
msf_to_bcd(&msf);
// Assign to CDDA MSF
cdrom->cdda_msf = msf;
memcpy(buf, cdrom->cdda_buf, size);
psx_spu_update_cdda_buffer(spu, cdrom->cdda_buf);
// Handle report IRQ
if (cdrom->cdda_sectors_played == CD_SECTORS_PS) {
if (cdrom->mode & MODE_REPORT) {
SET_BITS(ifr, IFR_INT, 1);
msf_t track, current = cdrom->cdda_msf;
msf_from_bcd(¤t);
psx_disc_get_track_addr(cdrom->disc, &track, cdrom->cdda_track);
unsigned int track_s = (track.m * 60) + track.s;
unsigned int current_s = (current.m * 60) + current.s;
unsigned int diff = current_s - track_s;
current.s = diff;
current.m = 0;
msf_adjust(¤t);
msf_to_bcd(¤t);
RESP_PUSH(0);
RESP_PUSH(0);
RESP_PUSH(cdrom->cdda_msf.f);
RESP_PUSH(current.s | 0x80);
RESP_PUSH(current.m);
RESP_PUSH(0);
RESP_PUSH(cdrom->cdda_track);
RESP_PUSH(GETSTAT_PLAY);
psx_ic_irq(cdrom->ic, IC_CDROM);
}
cdrom->cdda_sectors_played = 0;
}
}
void psx_cdrom_destroy(psx_cdrom_t* cdrom) {
if (cdrom->disc)
psx_disc_destroy(cdrom->disc);
free(cdrom);
}