2 * Mach Operating System
3 * Copyright (c) 1992, 1991 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
26 * from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
27 * $FreeBSD: src/sys/boot/pc98/boot2/disk.c,v 1.4.2.1 2003/01/13 08:52:53 nyan Exp $
31 * Ported to PC-9801 by Yoshio Kimura
36 * If there is no 386BSD partition, initialize the label sector with
37 * LABELSECTOR instead of with garbage.
40 * Fixed reading of bad sector table. It is at the end of the 'c'
41 * partition, which is not always at the end of the disk.
45 #include <sys/disklabel.h>
46 #include <sys/diskslice.h>
48 #define BIOS_DEV_FLOPPY 0x0
49 #define BIOS_DEV_WIN 0x80
52 #define SPT(di) ((di)&0xff)
53 #define HEADS(di) (((di)>>8)&0xff)
60 int dosdev, unit, slice, part, maj, boff;
62 /*#define EMBEDDED_DISKLABEL 1*/
64 /* Read ahead buffer large enough for one track on a 1440K floppy. For
65 * reading from floppies, the bootstrap has to be loaded on a 64K boundary
66 * to ensure that this buffer doesn't cross a 64K DMA boundary.
69 static char ra_buf[RA_SECTORS * BPS];
74 static char *Bread(int dosdev, int sector);
79 struct dos_partition *dptr;
82 int i, sector = 0, di, dosdev_copy;
85 di = get_diskinfo(dosdev_copy);
86 spc = (spt = SPT(di)) * HEADS(di);
89 if ((dosdev_copy & 0xf0) == 0x90)
92 part = (spt == 15 ? 0 : 1);
96 #ifdef EMBEDDED_DISKLABEL
98 #else EMBEDDED_DISKLABEL
100 p = Bread(dosdev_copy, 1);
101 dptr = (struct dos_partition *)p;
102 slice = WHOLE_DISK_SLICE;
103 for (i = 0; i < NDOSPART; i++, dptr++)
104 if (dptr->dp_mid == DOSPTYP_386BSD) {
105 slice = BASE_SLICE + i;
106 sector = dptr->dp_scyl * spc;
109 p = Bread(dosdev, sector + LABELSECTOR);
110 dl=((struct disklabel *)p);
111 disklabel = *dl; /* structure copy (maybe useful later)*/
113 p = Bread(dosdev_copy, 0);
114 dptr = (struct dos_partition *)(p+DOSPARTOFF);
115 slice = WHOLE_DISK_SLICE;
116 for (i = 0; i < NDOSPART; i++, dptr++)
117 if (dptr->dp_typ == DOSPTYP_386BSD) {
118 slice = BASE_SLICE + i;
119 sector = dptr->dp_start;
122 p = Bread(dosdev_copy, sector + LABELSECTOR);
123 dl=((struct disklabel *)p);
124 disklabel = *dl; /* structure copy (maybe useful later)*/
126 #endif EMBEDDED_DISKLABEL
127 if (dl->d_magic != DISKMAGIC) {
128 printf("bad disklabel\n");
131 /* This little trick is for OnTrack DiskManager disks */
132 boff = dl->d_partitions[part].p_offset -
133 dl->d_partitions[2].p_offset + sector;
136 bsize = dl->d_partitions[part].p_size;
138 printf("empty partition\n");
151 * Be aware that cnt is rounded up to N*BPS
154 devread(char *iodest, int sector, int cnt)
160 for (offset = 0; offset < cnt; offset += BPS)
162 dosdev_copy = dosdev;
163 p = Bread(dosdev_copy, sector++);
164 bcopy(p, iodest+offset, BPS);
170 Bread(int dosdev, int sector)
172 if (dosdev != ra_dev || sector < ra_first || sector >= ra_end)
174 int cyl, head, sec, nsec;
179 printf("Error: C:%d > 1023 (BIOS limit)\n", cyl);
180 for(;;); /* loop forever */
183 head = (sector % spc) / spt;
186 if (nsec > RA_SECTORS)
189 if (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0)
193 while (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0) {
194 printf("Error: D:0x%x C:%d H:%d S:%d\n",
195 dosdev, cyl, head, sec);
201 ra_end = sector + nsec;
203 return (ra_buf + (sector - ra_first) * BPS);