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biosdisk.c (292682) biosdisk.c (298230)
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/pc98/libpc98/biosdisk.c 292682 2015-12-24 06:22:41Z jhb $");
28__FBSDID("$FreeBSD: head/sys/boot/pc98/libpc98/biosdisk.c 298230 2016-04-18 23:09:22Z allanjude $");
29
30/*
31 * BIOS disk device handling.
32 *
33 * Ideas and algorithms from:
34 *
35 * - NetBSD libi386/biosdisk.c
36 * - FreeBSD biosboot/disk.c

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91 * BIOS unit number.
92 */
93static struct bdinfo
94{
95 int bd_unit; /* BIOS unit number */
96 int bd_flags;
97 int bd_type; /* BIOS 'drive type' (floppy only) */
98 int bd_da_unit; /* kernel unit number for da */
29
30/*
31 * BIOS disk device handling.
32 *
33 * Ideas and algorithms from:
34 *
35 * - NetBSD libi386/biosdisk.c
36 * - FreeBSD biosboot/disk.c

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91 * BIOS unit number.
92 */
93static struct bdinfo
94{
95 int bd_unit; /* BIOS unit number */
96 int bd_flags;
97 int bd_type; /* BIOS 'drive type' (floppy only) */
98 int bd_da_unit; /* kernel unit number for da */
99 int bd_open; /* reference counter */
100 void *bd_bcache; /* buffer cache data */
99} bdinfo [MAXBDDEV];
100static int nbdinfo = 0;
101
101} bdinfo [MAXBDDEV];
102static int nbdinfo = 0;
103
104#define BD(dev) (bdinfo[(dev)->d_unit])
105
102static int bd_getgeom(struct open_disk *od);
103static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
104 caddr_t dest);
105static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
106 caddr_t dest);
107
108static int bd_int13probe(struct bdinfo *bd);
109

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171bd_init(void)
172{
173 int base, unit;
174 int da_drive=0, n=-0x10;
175
176 /* sequence 0x90, 0x80, 0xa0 */
177 for (base = 0x90; base <= 0xa0; base += n, n += 0x30) {
178 for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) {
106static int bd_getgeom(struct open_disk *od);
107static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
108 caddr_t dest);
109static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
110 caddr_t dest);
111
112static int bd_int13probe(struct bdinfo *bd);
113

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175bd_init(void)
176{
177 int base, unit;
178 int da_drive=0, n=-0x10;
179
180 /* sequence 0x90, 0x80, 0xa0 */
181 for (base = 0x90; base <= 0xa0; base += n, n += 0x30) {
182 for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) {
183 bdinfo[nbdinfo].bd_open = 0;
184 bdinfo[nbdinfo].bd_bcache = NULL;
179 bdinfo[nbdinfo].bd_unit = unit;
180 bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0;
181
182 if (!bd_int13probe(&bdinfo[nbdinfo])){
183 if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) ||
184 ((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6))
185 continue; /* Target IDs are not contiguous. */
186 else

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200 bdinfo[nbdinfo].bd_da_unit = da_drive++;
201 }
202 /* XXX we need "disk aliases" to make this simpler */
203 printf("BIOS drive %c: is disk%d\n",
204 'A' + nbdinfo, nbdinfo);
205 nbdinfo++;
206 }
207 }
185 bdinfo[nbdinfo].bd_unit = unit;
186 bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0;
187
188 if (!bd_int13probe(&bdinfo[nbdinfo])){
189 if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) ||
190 ((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6))
191 continue; /* Target IDs are not contiguous. */
192 else

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206 bdinfo[nbdinfo].bd_da_unit = da_drive++;
207 }
208 /* XXX we need "disk aliases" to make this simpler */
209 printf("BIOS drive %c: is disk%d\n",
210 'A' + nbdinfo, nbdinfo);
211 nbdinfo++;
212 }
213 }
214 bcache_add_dev(nbdinfo);
208 return(0);
209}
210
211/*
212 * Try to detect a device supported by the legacy int13 BIOS
213 */
214static int
215bd_int13probe(struct bdinfo *bd)

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422 int error;
423
424 va_start(ap, f);
425 dev = va_arg(ap, struct i386_devdesc *);
426 va_end(ap);
427 if ((error = bd_opendisk(&od, dev)))
428 return(error);
429
215 return(0);
216}
217
218/*
219 * Try to detect a device supported by the legacy int13 BIOS
220 */
221static int
222bd_int13probe(struct bdinfo *bd)

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429 int error;
430
431 va_start(ap, f);
432 dev = va_arg(ap, struct i386_devdesc *);
433 va_end(ap);
434 if ((error = bd_opendisk(&od, dev)))
435 return(error);
436
437 BD(dev).bd_open++;
438 if (BD(dev).bd_bcache == NULL)
439 BD(dev).bd_bcache = bcache_allocate();
440
430 /*
431 * Save our context
432 */
433 ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
434 DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
435 return(0);
436}
437

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691 }
692 }
693 return (prefslice);
694}
695
696static int
697bd_close(struct open_file *f)
698{
441 /*
442 * Save our context
443 */
444 ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
445 DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
446 return(0);
447}
448

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702 }
703 }
704 return (prefslice);
705}
706
707static int
708bd_close(struct open_file *f)
709{
699 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
710 struct i386_devdesc *dev = f->f_devdata;
711 struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data);
700
712
713 BD(dev).bd_open--;
714 if (BD(dev).bd_open == 0) {
715 bcache_free(BD(dev).bd_bcache);
716 BD(dev).bd_bcache = NULL;
717 }
718
701 bd_closedisk(od);
702 return(0);
703}
704
705static void
706bd_closedisk(struct open_disk *od)
707{
708 DEBUG("open_disk %p", od);
709#if 0
710 /* XXX is this required? (especially if disk already open...) */
711 if (od->od_flags & BD_FLOPPY)
712 delay(3000000);
713#endif
714 free(od);
715}
716
717static int
719 bd_closedisk(od);
720 return(0);
721}
722
723static void
724bd_closedisk(struct open_disk *od)
725{
726 DEBUG("open_disk %p", od);
727#if 0
728 /* XXX is this required? (especially if disk already open...) */
729 if (od->od_flags & BD_FLOPPY)
730 delay(3000000);
731#endif
732 free(od);
733}
734
735static int
718bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
736bd_strategy(void *devdata, int rw, daddr_t dblk, size_t offset, size_t size,
737 char *buf, size_t *rsize)
719{
720 struct bcache_devdata bcd;
738{
739 struct bcache_devdata bcd;
721 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
740 struct i386_devdesc *dev = f->f_devdata;
741 struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data);
722
723 bcd.dv_strategy = bd_realstrategy;
724 bcd.dv_devdata = devdata;
742
743 bcd.dv_strategy = bd_realstrategy;
744 bcd.dv_devdata = devdata;
725 return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, size, buf, rsize));
745 bcd.dv_cache = BD(dev).bd_bcache;
746 return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, offset,
747 size, buf, rsize));
726}
727
728static int
748}
749
750static int
729bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
751bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t offset,
752 size_t size, char *buf, size_t *rsize)
730{
731 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
732 int blks;
733#ifdef BD_SUPPORT_FRAGS
734 char fragbuf[BIOSDISK_SECSIZE];
735 size_t fragsize;
736
737 fragsize = size % BIOSDISK_SECSIZE;

--- 348 unchanged lines hidden --- 		753{
754 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
755 int blks;
756#ifdef BD_SUPPORT_FRAGS
757 char fragbuf[BIOSDISK_SECSIZE];
758 size_t fragsize;
759
760 fragsize = size % BIOSDISK_SECSIZE;

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