2 * Copyright (c) 1992, 1993, 1996
3 * Berkeley Software Design, Inc. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Berkeley Software
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * BSDI int13.c,v 2.3 1996/04/08 19:32:43 bostic Exp
32 * $FreeBSD: src/usr.bin/doscmd/int13.c,v 1.4.2.2 2002/04/25 11:04:51 tg Exp $
33 * $DragonFly: src/usr.bin/doscmd/int13.c,v 1.2 2003/06/17 04:29:26 dillon Exp $
36 #include <sys/ioctl.h>
37 #include <sys/types.h>
43 #define FDCHANGED _IOR('F', 64, int)
45 #define INT13_ERR_NONE 0x00
46 #define INT13_ERR_BAD_COMMAND 0x01
47 #define INT13_ERR_BAD_ADDRESS_MARK 0x02
48 #define INT13_ERR_WRITE_PROTECT 0x03
49 #define INT13_ERR_SECTOR_ID_BAD 0x04
50 #define INT13_ERR_RESET_FAILURE 0x05
51 #define INT13_ERR_CLL_ACTIVE 0x06
52 #define INT13_ERR_ACT_FAILED 0x07
53 #define INT13_ERR_DMA_OVERRUN 0x08
54 #define INT13_ERR_DMA_BOUNDARY 0x09
55 #define INT13_ERR_BAD_TRACK_FLAG 0x0B
56 #define INT13_ERR_MEDIA_TYP_UNKNOWN 0x0C
57 #define INT13_ERR_CRC 0x10
58 #define INT13_ERR_CORRECTED 0x11
59 #define INT13_ERR_CTRLR_FAILURE 0x20
60 #define INT13_ERR_SEEK 0x40
61 #define INT13_ERR_TIME_OUT 0x80
62 #define INT13_ERR_NOT_READY 0xAA
63 #define INT13_ERR_UNDEFINED 0xBB
64 #define INT13_ERR_SENSE_OPERATION 0xFF
90 char *list[4]; /* Up to 4 devices allowed */
94 int changed:1; /* Set if we change format */
97 #define hd_status (*(u_char *)0x474)
98 #define fd_status (*(u_char *)0x441)
101 disize(struct diskinfo *di)
103 return(di->sectors * di->cylinders * di->sides);
107 cylsize(struct diskinfo *di)
109 return(di->sectors * di->sides);
112 static u_long ftable = 0xF1000; /* Floppy table */
113 static u_long htable = 0xF1020; /* Hard disk table */
115 static struct diskinfo diskinfo[26];
117 static struct diskinfo floppyinfo[] = {
118 {0, 9, 40, 1, 512, -1, NULL, 0, NULL, 0,
119 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0}, /* Probably not correct */
120 {1, 9, 40, 2, 512, -1, NULL, 0, NULL, 0,
121 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0},
122 {2, 9, 80, 2, 512, -1, NULL, 0, NULL, 0,
123 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0},
124 {3, 15, 80, 2, 512, -1, NULL, 0, NULL, 0,
125 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0},
126 {4, 18, 80, 2, 512, -1, NULL, 0, NULL, 0,
127 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0},
128 {6, 36, 80, 2, 512, -1, NULL, 0, NULL, 0,
129 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0},
130 {-1, 0, 0, 0, 0, 0, NULL, 0, NULL, 0,
131 {NULL, NULL, NULL, NULL}, 0, 0, 0, 0}
134 static struct diskinfo *
139 if (drive >= 2 && drive < 0x80) {
147 if (drive > 25 || diskinfo[drive].path == 0) {
150 di = &diskinfo[drive];
152 if (di->removeable) {
154 if (!(di->path = di->list[di->multi]))
155 di->path = di->list[di->multi = 0];
157 if ((di->fd = open(di->path, di->read_only ? O_RDONLY
158 : O_RDWR|O_FSYNC)) < 0 &&
159 (di->read_only = 1) &&
160 (di->fd = open(di->path, O_RDONLY)) < 0) {
163 di->fd = squirrel_fd(di->fd);
182 make_readonly(int drive)
184 if (drive < 0 || drive >= 26)
186 diskinfo[drive].read_only = 1;
190 init_hdisk(int drive, int cyl, int head, int tracksize, char *file, char *fake_ptab)
196 for (drive = 2; drive < 26; ++drive) {
197 if (diskinfo[drive].path == 0)
202 fprintf(stderr, "Only floppies may be assigned to A: or B:\n");
207 fprintf(stderr, "Too many disk drives (only 24 allowed)\n");
211 di = &diskinfo[drive];
214 fprintf(stderr, "Drive %c: already assigned to %s\n", drntol(drive),
219 di->sectors = tracksize;
231 if ((fd = open(fake_ptab, 0)) < 0) {
235 di->sector0 = malloc(512);
237 perror("malloc in init_hdisk");
241 read(fd, di->sector0, 512);
244 ptab = (PTAB *)(di->sector0 + 0x01BE);
246 for (fd = 0; fd < 4; ++fd) {
247 if (*(u_short *)(di->sector0 + 0x1FE) == 0xAA55 &&
248 ptab[fd].numSectors == (u_long)(head * tracksize * cyl) &&
249 (ptab[fd].systemID == 1 || ptab[fd].systemID == 4 ||
250 ptab[fd].systemID == 6))
255 memcpy(ptab, ptab + fd, sizeof(PTAB));
256 memset(ptab + 1, 0, sizeof(PTAB) * 3);
257 di->offset = ptab[0].relSector;
258 di->cylinders += di->offset / cylsize(di);
260 memset(ptab, 0, sizeof(PTAB) * 4);
263 ptab->beginSector = 1; /* this is 1 based */
266 ptab->endHead = head - 1;
267 ptab->endSector = tracksize; /* this is 1 based */
268 ptab->endCyl = cyl & 0xff;
269 ptab->endSector |= (cyl & 0x300) >> 2;
271 ptab->relSector = head * tracksize;
272 ptab->numSectors = head * tracksize * cyl;
274 *(u_short *)(di->sector0 + 0x1FE) = 0xAA55;
284 if ((clusters = buf[0x0D]) == 0) {
285 if (disize(di) <= 128 * 2048)
287 else if (disize(di) <= 256 * 2048)
289 else if (disize(di) <= 8 * 1024 * 2048)
291 else if (disize(di) <= 16 * 1024 * 2048)
296 if ((disize(di) / clusters) <= 4096) {
297 ptab->systemID = 0x01;
299 ptab->systemID = 0x04;
302 di->cylinders += 1; /* Extra cylinder for partition table, etc. */
304 ptab->bootIndicator = 0x80;
309 di->path = strdup(file);
311 di->location = ((table & 0xf0000) << 12) | (table & 0xffff);
314 ivec[0x41] = di->location;
315 } else if (drive == 1) {
316 ivec[0x46] = di->location;
319 table = htable + (drive - 2) * 0x10;
320 *(u_short *)(table+0x00) = di->cylinders-1; /* Cylinders */
321 *(u_char *)(table+0x02) = di->sides; /* Heads */
322 *(u_short *)(table+0x03) = 0; /* 0 */
323 *(u_short *)(table+0x05) = 0xffff; /* write pre-comp */
324 *(u_char *)(table+0x07) = 0; /* ECC Burst length */
325 *(u_char *)(table+0x08) = 0; /* Control Byte */
326 *(u_char *)(table+0x09) = 0; /* standard timeout */
327 *(u_char *)(table+0x0a) = 0; /* formatting timeout */
328 *(u_char *)(table+0x0b) = 0; /* timeout for checking drive */
329 *(u_short *)(table+0x0c) = di->cylinders-1; /* landing zone */
330 *(u_char *)(table+0x0e) = di->sectors; /* sectors/track */
331 *(u_char *)(table+0x0f) = 0;
333 if ((drive - 1) >= ndisks)
345 case 1024: return(3);
347 fprintf(stderr, "Invalid sector size: %d\n", size);
350 /* keep `gcc -Wall' happy */
355 init_floppy(int drive, int type, char *file)
357 struct diskinfo *di = floppyinfo;
361 while (di->type >= 0 && di->type != type && disize(di)/2 != type)
365 fprintf(stderr, "Invalid floppy type: %d\n", type);
370 if (diskinfo[0].path == 0) {
372 } else if (diskinfo[1].path == 0) {
375 fprintf(stderr, "Too many floppy drives (only 2 allowed)\n");
380 fprintf(stderr, "Floppies must be either drive A: or B:\n");
384 if (drive >= nfloppies)
385 nfloppies = drive + 1;
387 if (diskinfo[drive].path == 0) {
388 diskinfo[drive] = *di;
391 di = &diskinfo[drive];
393 if (stat(file, &sb) < 0) {
394 fprintf(stderr, "Drive %c: Could not stat %s\n", drntol(drive), file);
398 if (drive < 2 && (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode))) {
399 if (di->path && !di->removeable) {
400 fprintf(stderr, "Drive %c: is not removeable and hence can only have one assignment\n", drntol(drive));
404 } else if (di->removeable) {
405 fprintf(stderr, "Drive %c: already assigned to %s\n", drntol(drive),
410 if (di->removeable) {
412 if (di->multi == 4) {
413 fprintf(stderr, "Drive %c: already assigned 4 devices\n",
418 di->path = di->list[di->multi++] = strdup(file);
421 fprintf(stderr, "Drive %c: already assigned to %s\n",
422 drntol(drive), di->path);
426 di->path = strdup(file);
429 di->location = ((table & 0xf0000) << 12) | (table & 0xffff);
433 ivec[0x1e] = ((ftable & 0xf0000) << 12) | (ftable & 0xffff);
435 table = ftable + drive * 0x0a;
437 *(u_char *)(table+0x00) = 0xdf; /* First Specify Byte */
438 *(u_char *)(table+0x01) = 0x02; /* Second Specify Byte */
439 *(u_char *)(table+0x02) = 0x25; /* Timer ticks to wait 'til motor OFF */
440 *(u_char *)(table+0x03) = bps(di->secsize); /* Number of bytes/sector */
441 *(u_char *)(table+0x04) = di->sectors; /* Number of sectors/track */
442 *(u_char *)(table+0x05) = 0x1b; /* Gap length, in bytes */
443 *(u_char *)(table+0x06) = 0xff; /* Data length, in bytes */
444 *(u_char *)(table+0x07) = 0x6c; /* Gap length for format */
445 *(u_char *)(table+0x09) = 0xf6; /* Fill byte for formatting */
446 *(u_char *)(table+0x09) = 0x0f; /* Head settle time, in milliseconds */
447 *(u_char *)(table+0x0a) = 0x08; /* Motor startup time, in 1/8 seconds */
454 return(i < nfloppies ? diskinfo[i].type : 0);
457 #define seterror(err) { \
467 trynext(struct diskinfo *di)
473 if (di->multi++ >= 4)
476 if (di->list[di->multi] && (di = getdisk(di - diskinfo))) {
484 diread(struct diskinfo *di, regcontext_t *REGS,
485 off_t start, char *addr, int sectors)
489 int drive = di - diskinfo;
498 res = lseek(di->fd, start * di->secsize, 0);
500 if (res < 0 && di->removeable && trynext(di))
504 seterror(INT13_ERR_SEEK);
508 res = read(di->fd, addr, sectors * di->secsize);
510 if (res < 0 && di->removeable && trynext(di))
513 if (di->removeable) {
515 seterror(INT13_ERR_NOT_READY);
518 return(res / di->secsize);
522 * reads always work, if if they don't.
523 * Just pretend any byte not read was actually a 0
526 memset(addr, 0, sectors * di->secsize);
527 else if (res < sectors * di->secsize)
528 memset(addr + res, 0, sectors * di->secsize - res);
534 diwrite(struct diskinfo *di, regcontext_t *REGS,
535 off_t start, char *addr, int sectors)
538 int drive = di - diskinfo;
547 res = lseek(di->fd, start * di->secsize, 0);
549 if (res < 0 && di->removeable && trynext(di))
553 seterror(INT13_ERR_SEEK);
557 res = write(di->fd, addr, sectors * di->secsize);
559 if (res < 0 && di->removeable && trynext(di))
562 if (di->removeable) {
564 seterror(INT13_ERR_NOT_READY);
567 } else if (res < 0) {
568 seterror(INT13_ERR_WRITE_PROTECT);
571 return(res / di->secsize);
575 int13(regcontext_t *REGS)
602 case 0x00: /* Reset */
604 case 0x01: /* Read disk status */
612 case 0x02: /* Read */
614 addr = (char *)MAKEPTR(R_ES, R_BX);
617 R_AL = 0; /* Start out with nothing read */
620 cyl = R_CH | ((R_CL & 0xc0) << 2);
621 sector = (R_CL & 0x3f) - 1;
627 if ((di = getdisk(drive)) == 0) {
628 debug(D_DISK, "Bad drive: %02x (%d : %d : %d)\n",
629 drive, cyl, side, sector);
630 seterror(INT13_ERR_BAD_COMMAND);
633 start = cyl * di->sectors * di->sides +
637 if (start >= disize(di)) {
638 debug(D_DISK, "Read past end of disk\n");
639 seterror(INT13_ERR_SEEK);
642 if (sectors + start >= disize(di)) {
643 sectors = disize(di) - start;
647 if (start < di->offset) {
650 memcpy(addr, di->sector0, di->secsize);
654 memset(addr, 0, sectors * di->secsize);
660 debug(D_DISK, "%02x: Read %2d sectors from %qd to %04x:%04x\n",
661 drive, sectors, start, R_ES, R_BX);
663 if ((did = diread(di, REGS, start, addr, sectors)) >= 0)
671 case 0x03: /* Write */
673 addr = (char *)MAKEPTR(R_ES, R_BX);
676 R_AL = 0; /* Start out with nothing written */
679 cyl = R_CH | ((R_CL & 0xc0) << 2);
680 sector = (R_CL & 0x3f) - 1;
686 if ((di = getdisk(drive)) == 0) {
687 debug(D_DISK, "Bad drive: %d (%d : %d : %d)\n",
688 drive, cyl, side, sector);
689 seterror(INT13_ERR_BAD_COMMAND);
693 debug(D_DISK, "%02x: Attempt to write readonly disk\n", drive);
694 seterror(INT13_ERR_WRITE_PROTECT);
697 start = cyl * di->sectors * di->sides +
701 if (start >= disize(di)) {
702 debug(D_DISK, "Write past end of disk\n");
703 seterror(INT13_ERR_SEEK);
707 if (sectors + start >= disize(di))
708 sectors = disize(di) - start;
711 if (start < di->offset) {
719 debug(D_DISK, "%02x: Write %2d sectors from %qd to %04x:%04x\n",
720 drive, sectors, start, R_ES, R_BX);
722 if ((did = diwrite(di, REGS, start, addr, sectors)) >= 0)
730 case 0x04: /* Verify */
736 cyl = R_CH | ((R_CL & 0xc0) << 2);
737 sector = (R_CL & 0x3f) - 1;
743 if ((di = getdisk(drive)) == 0) {
744 debug(D_DISK, "Bad drive: %d (%d : %d : %d)\n",
745 drive, cyl, side, sector);
746 seterror(INT13_ERR_BAD_COMMAND);
749 start = cyl * di->sectors * di->sides +
753 if (start >= disize(di)) {
754 debug(D_DISK, "Verify past end of disk\n");
755 seterror(INT13_ERR_SEEK);
759 if (sectors + start >= disize(di))
760 sectors = disize(di) - start;
763 if (start < di->offset)
769 debug(D_DISK, "Verify %2d sectors from %qd\n", sectors, start);
770 if (lseek(di->fd, start * di->secsize, 0) < 0) {
771 debug(D_DISK, "Seek error\n");
772 seterror(INT13_ERR_SEEK);
775 while (sectors > 0) {
777 if (read(di->fd, buf, di->secsize) != di->secsize) {
778 debug(D_DISK, "Verify error\n");
790 case 0x05: /* Format track */
791 seterror(INT13_ERR_BAD_COMMAND);
794 case 0x08: /* Status */
797 if ((di = getdisk(drive)) == 0) {
798 debug(D_DISK, "Bad drive: %d\n", drive);
799 seterror(INT13_ERR_BAD_COMMAND);
805 if ((drive & 0x80) == 0)
806 PUTVEC(R_ES, R_DI, di->location);
808 R_CL = di->sectors | ((di->cylinders >> 2) & 0xc0);
809 R_CH = di->cylinders & 0xff;
810 R_DL = (drive & 0x80) ? ndisks : nfloppies;
811 R_DH = di->sides - 1;
812 debug(D_DISK, "%02x: Status requested: sec %d cyl %d side %d drive %d\n",
813 drive, R_CL, R_CH, R_DH, R_DL);
820 case 0x0c: /* Move read/write head */
821 case 0x0d: /* Reset */
824 case 0x10: /* check for disk ready */
825 R_AH = 0; /* always open for business */
829 if ((di = getdisk(drive)) == 0) {
836 start = di->sectors * di->cylinders * di->sides;
841 R_AH = 1; /* Non-changeable disk */
845 case 0x16: /* Media change */
847 if ((di = getdisk(drive)) && di->changed) {
853 case 0x17: /* Determine floppy disk format */
854 seterror(INT13_ERR_BAD_COMMAND);
857 case 0x18: /* Determine disk format */
858 if ((di = getdisk(drive)) == 0) {
863 /* XXX incomplete? */
867 unknown_int2(0x13, R_AH, REGS);
877 vec = insert_softint_trampoline();
879 register_callback(vec, int13, "int 13");
881 vec = insert_null_trampoline();