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86Box/src/floppy/fdd.c
Jasmine Iwanek 8e556ada7e Add (commented out) eqiv of the TEAC FD-235GF 
Commented out because it could actually be our existing 35_2hd_nec, we need to check whether this needs the INVERT_DENSEL flag or not
2024-05-31 23:56:30 -04:00

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/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Implementation of the floppy drive emulation.
*
*
*
* Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
* Fred N. van Kempen, <decwiz@yahoo.com>
*
* Copyright 2008-2019 Sarah Walker.
* Copyright 2016-2019 Miran Grca.
* Copyright 2018-2019 Fred N. van Kempen.
*/
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#define HAVE_STDARG_H
#include <86box/86box.h>
#include <86box/timer.h>
#include <86box/path.h>
#include <86box/plat.h>
#include <86box/ui.h>
#include <86box/fdd.h>
#include <86box/fdd_86f.h>
#include <86box/fdd_fdi.h>
#include <86box/fdd_imd.h>
#include <86box/fdd_img.h>
#include <86box/fdd_pcjs.h>
#include <86box/fdd_mfm.h>
#include <86box/fdd_td0.h>
#include <86box/fdc.h>
/* Flags:
Bit 0: 300 rpm supported;
Bit 1: 360 rpm supported;
Bit 2: size (0 = 3.5", 1 = 5.25");
Bit 3: sides (0 = 1, 1 = 2);
Bit 4: double density supported;
Bit 5: high density supported;
Bit 6: extended density supported;
Bit 7: double step for 40-track media;
Bit 8: invert DENSEL polarity;
Bit 9: ignore DENSEL;
Bit 10: drive is a PS/2 drive;
*/
#define FLAG_RPM_300 1
#define FLAG_RPM_360 2
#define FLAG_525 4
#define FLAG_DS 8
#define FLAG_HOLE0 16
#define FLAG_HOLE1 32
#define FLAG_HOLE2 64
#define FLAG_DOUBLE_STEP 128
#define FLAG_INVERT_DENSEL 256
#define FLAG_IGNORE_DENSEL 512
#define FLAG_PS2 1024
typedef struct fdd_t {
int type;
int track;
int densel;
int head;
int turbo;
int check_bpb;
} fdd_t;
fdd_t fdd[FDD_NUM];
char floppyfns[FDD_NUM][512];
char *fdd_image_history[FDD_NUM][FLOPPY_IMAGE_HISTORY];
pc_timer_t fdd_poll_time[FDD_NUM];
static int fdd_notfound = 0;
static int driveloaders[FDD_NUM];
int writeprot[FDD_NUM];
int fwriteprot[FDD_NUM];
int fdd_changed[FDD_NUM];
int ui_writeprot[FDD_NUM] = { 0, 0, 0, 0 };
int drive_empty[FDD_NUM] = { 1, 1, 1, 1 };
DRIVE drives[FDD_NUM];
uint64_t motoron[FDD_NUM];
fdc_t *fdd_fdc;
d86f_handler_t d86f_handler[FDD_NUM];
static const struct
{
char *ext;
void (*load)(int drive, char *fn);
void (*close)(int drive);
int size;
} loaders[] = {
{ "001", img_load, img_close, -1},
{ "002", img_load, img_close, -1},
{ "003", img_load, img_close, -1},
{ "004", img_load, img_close, -1},
{ "005", img_load, img_close, -1},
{ "006", img_load, img_close, -1},
{ "007", img_load, img_close, -1},
{ "008", img_load, img_close, -1},
{ "009", img_load, img_close, -1},
{ "010", img_load, img_close, -1},
{ "12", img_load, img_close, -1},
{ "144", img_load, img_close, -1},
{ "360", img_load, img_close, -1},
{ "720", img_load, img_close, -1},
{ "86F", d86f_load, d86f_close, -1},
{ "BIN", img_load, img_close, -1},
{ "CQ", img_load, img_close, -1},
{ "CQM", img_load, img_close, -1},
{ "DDI", img_load, img_close, -1},
{ "DSK", img_load, img_close, -1},
{ "FDI", fdi_load, fdi_close, -1},
{ "FDF", img_load, img_close, -1},
{ "FLP", img_load, img_close, -1},
{ "HDM", img_load, img_close, -1},
{ "IMA", img_load, img_close, -1},
{ "IMD", imd_load, imd_close, -1},
{ "IMG", img_load, img_close, -1},
{ "JSON", pcjs_load, pcjs_close, -1},
{ "MFM", mfm_load, mfm_close, -1},
{ "TD0", td0_load, td0_close, -1},
{ "VFD", img_load, img_close, -1},
{ "XDF", img_load, img_close, -1},
{ 0, 0, 0, 0 }
};
static const struct {
int max_track;
int flags;
const char *name;
const char *internal_name;
} drive_types[] = {
/* None */
{ 0, 0, "None", "none" },
/* 5.25" 1DD */
{ 43, FLAG_RPM_300 | FLAG_525 | FLAG_HOLE0, "5.25\" 180k", "525_1dd" },
/* 5.25" DD */
{ 43, FLAG_RPM_300 | FLAG_525 | FLAG_DS | FLAG_HOLE0, "5.25\" 360k", "525_2dd" },
/* 5.25" QD */
{ 86, FLAG_RPM_300 | FLAG_525 | FLAG_DS | FLAG_HOLE0 | FLAG_DOUBLE_STEP, "5.25\" 720k", "525_2qd" },
/* 5.25" HD PS/2 */
{ 86, FLAG_RPM_360 | FLAG_525 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP | FLAG_INVERT_DENSEL | FLAG_PS2, "5.25\" 1.2M PS/2", "525_2hd_ps2" },
/* 5.25" HD */
{ 86, FLAG_RPM_360 | FLAG_525 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP, "5.25\" 1.2M", "525_2hd" },
/* 5.25" HD Dual RPM */
{ 86, FLAG_RPM_300 | FLAG_RPM_360 | FLAG_525 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP, "5.25\" 1.2M 300/360 RPM", "525_2hd_dualrpm" },
/* 3.5" 1DD */
{ 86, FLAG_RPM_300 | FLAG_HOLE0 | FLAG_DOUBLE_STEP, "3.5\" 360k", "35_1dd" },
/* 3.5" DD, Equivalent to TEAC FD-235F */
{ 86, FLAG_RPM_300 | FLAG_DS | FLAG_HOLE0 | FLAG_DOUBLE_STEP, "3.5\" 720k", "35_2dd" },
/* 3.5" HD PS/2 */
{ 86, FLAG_RPM_300 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP | FLAG_INVERT_DENSEL | FLAG_PS2, "3.5\" 1.44M PS/2", "35_2hd_ps2" },
/* 3.5" HD, Equivalent to TEAC FD-235HF */
{ 86, FLAG_RPM_300 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP, "3.5\" 1.44M", "35_2hd" },
/* TODO: 3.5" DD, Equivalent to TEAC FD-235GF */
// { 86, FLAG_RPM_300 | FLAG_RPM_360 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP, "3.5\" 1.25M", "35_2hd_2mode" },
/* 3.5" HD PC-98 */
{ 86, FLAG_RPM_300 | FLAG_RPM_360 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP | FLAG_INVERT_DENSEL, "3.5\" 1.25M PC-98", "35_2hd_nec" },
/* 3.5" HD 3-Mode, Equivalent to TEAC FD-235HG */
{ 86, FLAG_RPM_300 | FLAG_RPM_360 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_DOUBLE_STEP, "3.5\" 1.44M 300/360 RPM", "35_2hd_3mode" },
/* 3.5" ED, Equivalent to TEAC FD-235J */
{ 86, FLAG_RPM_300 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_HOLE2 | FLAG_DOUBLE_STEP, "3.5\" 2.88M", "35_2ed" },
/* 3.5" ED Dual RPM, Equivalent to TEAC FD-335J */
{ 86, FLAG_RPM_300 | FLAG_RPM_360 | FLAG_DS | FLAG_HOLE0 | FLAG_HOLE1 | FLAG_HOLE2 | FLAG_DOUBLE_STEP, "3.5\" 2.88M 300/360 RPM", "35_2ed_dualrpm" },
/* End of list */
{ -1, -1, "", "" }
};
#ifdef ENABLE_FDD_LOG
int fdd_do_log = ENABLE_FDD_LOG;
static void
fdd_log(const char *fmt, ...)
{
va_list ap;
if (fdd_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
# define fdd_log(fmt, ...)
#endif
char *
fdd_getname(int type)
{
return (char *) drive_types[type].name;
}
char *
fdd_get_internal_name(int type)
{
return (char *) drive_types[type].internal_name;
}
int
fdd_get_from_internal_name(char *s)
{
int c = 0;
while (strlen(drive_types[c].internal_name)) {
if (!strcmp((char *) drive_types[c].internal_name, s))
return c;
c++;
}
return 0;
}
/* This is needed for the dump as 86F feature. */
void
fdd_do_seek(int drive, int track)
{
if (drives[drive].seek)
drives[drive].seek(drive, track);
}
void
fdd_forced_seek(int drive, int track_diff)
{
fdd[drive].track += track_diff;
if (fdd[drive].track < 0)
fdd[drive].track = 0;
if (fdd[drive].track > drive_types[fdd[drive].type].max_track)
fdd[drive].track = drive_types[fdd[drive].type].max_track;
fdd_do_seek(drive, fdd[drive].track);
}
void
fdd_seek(int drive, int track_diff)
{
if (!track_diff)
return;
fdd[drive].track += track_diff;
if (fdd[drive].track < 0)
fdd[drive].track = 0;
if (fdd[drive].track > drive_types[fdd[drive].type].max_track)
fdd[drive].track = drive_types[fdd[drive].type].max_track;
fdd_changed[drive] = 0;
fdd_do_seek(drive, fdd[drive].track);
}
int
fdd_track0(int drive)
{
/* If drive is disabled, TRK0 never gets set. */
if (!drive_types[fdd[drive].type].max_track)
return 0;
return !fdd[drive].track;
}
int
fdd_current_track(int drive)
{
return fdd[drive].track;
}
void
fdd_set_densel(int densel)
{
for (uint8_t i = 0; i < FDD_NUM; i++) {
if (drive_types[fdd[i].type].flags & FLAG_INVERT_DENSEL)
fdd[i].densel = densel ^ 1;
else
fdd[i].densel = densel;
}
}
int
fdd_getrpm(int drive)
{
int densel = 0;
int hole;
hole = fdd_hole(drive);
densel = fdd[drive].densel;
if (drive_types[fdd[drive].type].flags & FLAG_INVERT_DENSEL)
densel ^= 1;
if (!(drive_types[fdd[drive].type].flags & FLAG_RPM_360))
return 300;
if (!(drive_types[fdd[drive].type].flags & FLAG_RPM_300))
return 360;
if (drive_types[fdd[drive].type].flags & FLAG_525)
return densel ? 360 : 300;
else {
/* fdd_hole(drive) returns 0 for double density media, 1 for high density, and 2 for extended density. */
if (hole == 1)
return densel ? 300 : 360;
else
return 300;
}
}
int
fdd_can_read_medium(int drive)
{
int hole = fdd_hole(drive);
hole = 1 << (hole + 4);
return !!(drive_types[fdd[drive].type].flags & hole);
}
int
fdd_doublestep_40(int drive)
{
return !!(drive_types[fdd[drive].type].flags & FLAG_DOUBLE_STEP);
}
void
fdd_set_type(int drive, int type)
{
int old_type = fdd[drive].type;
fdd[drive].type = type;
if ((drive_types[old_type].flags ^ drive_types[type].flags) & FLAG_INVERT_DENSEL)
fdd[drive].densel ^= 1;
}
int
fdd_get_type(int drive)
{
return fdd[drive].type;
}
int
fdd_get_flags(int drive)
{
return drive_types[fdd[drive].type].flags;
}
int
fdd_is_525(int drive)
{
return drive_types[fdd[drive].type].flags & FLAG_525;
}
int
fdd_is_dd(int drive)
{
return (drive_types[fdd[drive].type].flags & 0x70) == 0x10;
}
int
fdd_is_hd(int drive)
{
return drive_types[fdd[drive].type].flags & FLAG_HOLE1;
}
int
fdd_is_ed(int drive)
{
return drive_types[fdd[drive].type].flags & FLAG_HOLE2;
}
int
fdd_is_double_sided(int drive)
{
return drive_types[fdd[drive].type].flags & FLAG_DS;
}
void
fdd_set_head(int drive, int head)
{
if (head && !fdd_is_double_sided(drive))
fdd[drive].head = 0;
else
fdd[drive].head = head;
}
int
fdd_get_head(int drive)
{
if (!fdd_is_double_sided(drive))
return 0;
return fdd[drive].head;
}
void
fdd_set_turbo(int drive, int turbo)
{
fdd[drive].turbo = turbo;
}
int
fdd_get_turbo(int drive)
{
return fdd[drive].turbo;
}
void
fdd_set_check_bpb(int drive, int check_bpb)
{
fdd[drive].check_bpb = check_bpb;
}
int
fdd_get_check_bpb(int drive)
{
return fdd[drive].check_bpb;
}
int
fdd_get_densel(int drive)
{
return fdd[drive].densel;
}
void
fdd_load(int drive, char *fn)
{
int c = 0;
int size;
const char *p;
FILE * fp;
fdd_log("FDD: loading drive %d with '%s'\n", drive, fn);
if (!fn)
return;
p = path_get_extension(fn);
if (!p)
return;
fp = plat_fopen(fn, "rb");
if (fp) {
if (fseek(fp, -1, SEEK_END) == -1)
fatal("fdd_load(): Error seeking to the end of the file\n");
size = ftell(fp) + 1;
fclose(fp);
while (loaders[c].ext) {
if (!strcasecmp(p, (char *) loaders[c].ext) && (size == loaders[c].size || loaders[c].size == -1)) {
driveloaders[drive] = c;
if (floppyfns[drive] != fn)
strcpy(floppyfns[drive], fn);
d86f_setup(drive);
loaders[c].load(drive, floppyfns[drive]);
drive_empty[drive] = 0;
fdd_forced_seek(drive, 0);
fdd_changed[drive] = 1;
return;
}
c++;
}
}
fdd_log("FDD: could not load '%s' %s\n", fn, p);
drive_empty[drive] = 1;
fdd_set_head(drive, 0);
memset(floppyfns[drive], 0, sizeof(floppyfns[drive]));
ui_sb_update_icon_state(SB_FLOPPY | drive, 1);
}
void
fdd_close(int drive)
{
fdd_log("FDD: closing drive %d\n", drive);
d86f_stop(drive); /* Call this first of all to make sure the 86F poll is back to idle state. */
if (loaders[driveloaders[drive]].close)
loaders[driveloaders[drive]].close(drive);
drive_empty[drive] = 1;
fdd_set_head(drive, 0);
floppyfns[drive][0] = 0;
drives[drive].hole = NULL;
drives[drive].poll = NULL;
drives[drive].seek = NULL;
drives[drive].readsector = NULL;
drives[drive].writesector = NULL;
drives[drive].comparesector = NULL;
drives[drive].readaddress = NULL;
drives[drive].format = NULL;
drives[drive].byteperiod = NULL;
drives[drive].stop = NULL;
d86f_destroy(drive);
ui_sb_update_icon_state(SB_FLOPPY | drive, 1);
}
int
fdd_hole(int drive)
{
if (drives[drive].hole)
return drives[drive].hole(drive);
else
return 0;
}
static __inline uint64_t
fdd_byteperiod(int drive)
{
if (!fdd_get_turbo(drive) && drives[drive].byteperiod)
return drives[drive].byteperiod(drive);
else
return 32ULL * TIMER_USEC;
}
void
fdd_set_motor_enable(int drive, int motor_enable)
{
/* I think here is where spin-up and spin-down should be implemented. */
if (motor_enable && !motoron[drive])
timer_set_delay_u64(&fdd_poll_time[drive], fdd_byteperiod(drive));
else if (!motor_enable)
timer_disable(&fdd_poll_time[drive]);
motoron[drive] = motor_enable;
}
static void
fdd_poll(void *priv)
{
int drive;
const DRIVE *drv = (DRIVE *) priv;
drive = drv->id;
if (drive >= FDD_NUM)
fatal("Attempting to poll floppy drive %i that is not supposed to be there\n", drive);
timer_advance_u64(&fdd_poll_time[drive], fdd_byteperiod(drive));
if (drv->poll)
drv->poll(drive);
if (fdd_notfound) {
fdd_notfound--;
if (!fdd_notfound)
fdc_noidam(fdd_fdc);
}
}
int
fdd_get_bitcell_period(int rate)
{
int bit_rate = 250;
switch (rate) {
case 0: /*High density*/
bit_rate = 500;
break;
case 1: /*Double density (360 rpm)*/
bit_rate = 300;
break;
case 2: /*Double density*/
bit_rate = 250;
break;
case 3: /*Extended density*/
bit_rate = 1000;
break;
default:
break;
}
return 1000000 / bit_rate * 2; /*Bitcell period in ns*/
}
void
fdd_reset(void)
{
for (uint8_t i = 0; i < FDD_NUM; i++) {
drives[i].id = i;
timer_add(&(fdd_poll_time[i]), fdd_poll, &drives[i], 0);
}
}
void
fdd_readsector(int drive, int sector, int track, int side, int density, int sector_size)
{
if (drives[drive].readsector)
drives[drive].readsector(drive, sector, track, side, density, sector_size);
else
fdd_notfound = 1000;
}
void
fdd_writesector(int drive, int sector, int track, int side, int density, int sector_size)
{
if (drives[drive].writesector)
drives[drive].writesector(drive, sector, track, side, density, sector_size);
else
fdd_notfound = 1000;
}
void
fdd_comparesector(int drive, int sector, int track, int side, int density, int sector_size)
{
if (drives[drive].comparesector)
drives[drive].comparesector(drive, sector, track, side, density, sector_size);
else
fdd_notfound = 1000;
}
void
fdd_readaddress(int drive, int side, int density)
{
if (drives[drive].readaddress)
drives[drive].readaddress(drive, side, density);
}
void
fdd_format(int drive, int side, int density, uint8_t fill)
{
if (drives[drive].format)
drives[drive].format(drive, side, density, fill);
else
fdd_notfound = 1000;
}
void
fdd_stop(int drive)
{
if (drives[drive].stop)
drives[drive].stop(drive);
}
void
fdd_set_fdc(void *fdc)
{
fdd_fdc = (fdc_t *) fdc;
}
void
fdd_init(void)
{
int i;
for (i = 0; i < FDD_NUM; i++) {
drives[i].poll = 0;
drives[i].seek = 0;
drives[i].readsector = 0;
}
img_init();
d86f_init();
td0_init();
imd_init();
pcjs_init();
for (i = 0; i < FDD_NUM; i++) {
fdd_load(i, floppyfns[i]);
}
}
void
fdd_do_writeback(int drive)
{
d86f_handler[drive].writeback(drive);
}
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