/*- * Copyright (c) 1998 Michael Smith * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/boot/i386/libi386/biosdisk.c,v 1.45 2004/09/21 06:46:44 wes Exp $ */ /* * BIOS disk device handling. * * Ideas and algorithms from: * * - NetBSD libi386/biosdisk.c * - FreeBSD biosboot/disk.c * */ #include #include #include #include #include #include #include #include #include #include #include "libi386.h" #define BIOS_NUMDRIVES 0x475 #define BIOSDISK_SECSIZE 512 #define BUFSIZE (4 * BIOSDISK_SECSIZE) #define MAXBDDEV MAXDEV #define DT_ATAPI 0x10 /* disk type for ATAPI floppies */ #define WDMAJOR 0 /* major numbers for devices we frontend for */ #define WFDMAJOR 1 #define FDMAJOR 2 #define DAMAJOR 4 #ifdef DISK_DEBUG # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) #else # define DEBUG(fmt, args...) #endif struct open_disk { int od_dkunit; /* disk unit number */ int od_unit; /* BIOS unit number */ int od_cyl; /* BIOS geometry */ int od_hds; int od_sec; int od_boff; /* block offset from beginning of BIOS disk */ int od_flags; #define BD_MODEINT13 0x0000 #define BD_MODEEDD1 0x0001 #define BD_MODEEDD3 0x0002 #define BD_MODEMASK 0x0003 #define BD_FLOPPY 0x0004 #define BD_LABELOK 0x0008 #define BD_PARTTABOK 0x0010 union { struct disklabel32 od_disklabel; struct disklabel64 od_disklabel64; }; int od_nslices; /* slice count */ struct dos_partition od_slicetab[NEXTDOSPART]; }; /* * List of BIOS devices, translation from disk unit number to * BIOS unit number. */ static struct bdinfo { int bd_unit; /* BIOS unit number */ int bd_flags; int bd_type; /* BIOS 'drive type' (floppy only) */ } bdinfo [MAXBDDEV]; static int nbdinfo = 0; static int bd_getgeom(struct open_disk *od); static int bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest); static int bd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest); static int bd_int13probe(struct bdinfo *bd); static void bd_printslice(struct open_disk *od, struct dos_partition *dp, char *prefix, int verbose); static void bd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix, int verbose); static int bd_init(void); static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf, size_t *rsize); static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf, size_t *rsize); static int bd_open(struct open_file *f, ...); static int bd_close(struct open_file *f); static void bd_print(int verbose); struct devsw biosdisk = { "disk", DEVT_DISK, bd_init, bd_strategy, bd_open, bd_close, noioctl, bd_print, NULL }; static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev); static void bd_closedisk(struct open_disk *od); static int bd_bestslice(struct open_disk *od); static void bd_chainextended(struct open_disk *od, u_int32_t base, u_int32_t offset); /* also used by CD code */ char __aligned(16) bounce_base[BOUNCEBUF_SIZE]; /* * Translate between BIOS device numbers and our private unit numbers. */ int bd_bios2unit(int biosdev) { int i; DEBUG("looking for bios device 0x%x", biosdev); for (i = 0; i < nbdinfo; i++) { DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit); if (bdinfo[i].bd_unit == biosdev) return(i); } return(-1); } int bd_unit2bios(int unit) { if ((unit >= 0) && (unit < nbdinfo)) return(bdinfo[unit].bd_unit); return(-1); } /* * Quiz the BIOS for disk devices, save a little info about them. */ static int bd_init(void) { int base, unit, nfd = 0; /* sequence 0, 0x80 */ for (base = 0; base <= 0x80; base += 0x80) { for (unit = base; (nbdinfo < MAXBDDEV); unit++) { /* check the BIOS equipment list for number of fixed disks */ if((base == 0x80) && (nfd >= *(unsigned char *)PTOV(BIOS_NUMDRIVES))) break; bdinfo[nbdinfo].bd_unit = unit; bdinfo[nbdinfo].bd_flags = (unit < 0x80) ? BD_FLOPPY : 0; if (!bd_int13probe(&bdinfo[nbdinfo])) break; /* XXX we need "disk aliases" to make this simpler */ printf("BIOS drive %c: is disk%d\n", (unit < 0x80) ? ('A' + unit) : ('C' + unit - 0x80), nbdinfo); nbdinfo++; if (base == 0x80) nfd++; } } return(0); } /* * Try to detect a device supported by the legacy int13 BIOS */ static int bd_int13probe(struct bdinfo *bd) { v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x800; v86.edx = bd->bd_unit; v86int(); if (!(v86.efl & PSL_C) && /* carry clear */ ((v86.edx & 0xff) > ((unsigned)bd->bd_unit & 0x7f))) { /* unit # OK */ /* * Ignore devices with an absurd sector size. */ if ((v86.ecx & 0x3f) == 0) { DEBUG("Invalid geometry for unit %d", bd->bd_unit); return(0); } bd->bd_flags |= BD_MODEINT13; bd->bd_type = v86.ebx & 0xff; /* Determine if we can use EDD with this device. */ v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x4100; v86.edx = bd->bd_unit; v86.ebx = 0x55aa; v86int(); if (!(v86.efl & PSL_C) && /* carry clear */ ((v86.ebx & 0xffff) == 0xaa55) && /* signature */ (v86.ecx & 0x1)) { /* packets mode ok */ bd->bd_flags |= BD_MODEEDD1; if((v86.eax & 0xff00) > 0x300) bd->bd_flags |= BD_MODEEDD3; } return(1); } return(0); } /* * Print information about disks */ static void bd_print(int verbose) { int i, j; char line[80]; struct i386_devdesc dev; struct open_disk *od; struct dos_partition *dptr; for (i = 0; i < nbdinfo; i++) { sprintf(line, " disk%d: BIOS drive %c:\n", i, (bdinfo[i].bd_unit < 0x80) ? ('A' + bdinfo[i].bd_unit) : ('C' + bdinfo[i].bd_unit - 0x80)); pager_output(line); /* try to open the whole disk */ dev.d_kind.biosdisk.unit = i; dev.d_kind.biosdisk.slice = -1; dev.d_kind.biosdisk.partition = -1; if (!bd_opendisk(&od, &dev)) { /* Do we have a partition table? */ if (od->od_flags & BD_PARTTABOK) { dptr = &od->od_slicetab[0]; /* Check for a "dedicated" disk */ if ((dptr[3].dp_typ == DOSPTYP_386BSD || dptr[3].dp_typ == DOSPTYP_NETBSD || dptr[3].dp_typ == DOSPTYP_DFLYBSD) && (dptr[3].dp_start == 0) && (dptr[3].dp_size == 50000)) { sprintf(line, " disk%d", i); bd_printbsdslice(od, 0, line, verbose); } else { for (j = 0; j < od->od_nslices; j++) { sprintf(line, " disk%ds%d", i, j + 1); bd_printslice(od, &dptr[j], line, verbose); } } } bd_closedisk(od); } } } /* * Print information about slices on a disk. For the size calculations we * assume a 512 byte sector. */ static void bd_printslice(struct open_disk *od, struct dos_partition *dp, char *prefix, int verbose) { char line[80]; switch (dp->dp_typ) { case DOSPTYP_DFLYBSD: case DOSPTYP_386BSD: case DOSPTYP_NETBSD: /* XXX: possibly add types 0 and 1, as in subr_disk, for gpt magic */ bd_printbsdslice(od, (daddr_t)dp->dp_start, prefix, verbose); return; case DOSPTYP_LINSWP: if (verbose) sprintf(line, "%s: Linux swap %.6dMB (%d - %d)\n", prefix, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: Linux swap\n", prefix); break; case DOSPTYP_LINUX: /* * XXX * read the superblock to confirm this is an ext2fs partition? */ if (verbose) sprintf(line, "%s: ext2fs %.6dMB (%d - %d)\n", prefix, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: ext2fs\n", prefix); break; case 0x00: /* unused partition */ case DOSPTYP_EXT: return; case 0x01: if (verbose) sprintf(line, "%s: FAT-12 %.6dMB (%d - %d)\n", prefix, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: FAT-12\n", prefix); break; case 0x04: case 0x06: case 0x0e: if (verbose) sprintf(line, "%s: FAT-16 %.6dMB (%d - %d)\n", prefix, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: FAT-16\n", prefix); break; case 0x0b: case 0x0c: if (verbose) sprintf(line, "%s: FAT-32 %.6dMB (%d - %d)\n", prefix, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: FAT-32\n", prefix); break; default: if (verbose) sprintf(line, "%s: Unknown fs: 0x%x %.6dMB (%d - %d)\n", prefix, dp->dp_typ, dp->dp_size / 2048, dp->dp_start, dp->dp_start + dp->dp_size); else sprintf(line, "%s: Unknown fs: 0x%x\n", prefix, dp->dp_typ); } pager_output(line); } static void print_partition(u_int8_t fstype, unsigned long long offset, unsigned long long size, int i, int od_flags, char *prefix, int verbose, int type) { char line[80]; /* * For each partition, make sure we know what type of fs it is. If * not, then skip it. However, since floppies often have bogus * fstypes, print the 'a' partition on a floppy even if it is marked * unused. */ if ((fstype == FS_SWAP) || (fstype == FS_VINUM) || (fstype == FS_HAMMER) || (fstype == FS_HAMMER2) || (fstype == FS_BSDFFS) || (fstype == FS_ZFS) || (fstype == FS_JFS2) || ((fstype == FS_UNUSED) && (od_flags & BD_FLOPPY) && (i == 0))) { /* Only print out statistics in verbose mode */ if (verbose) { sprintf(line, "%c %s%c: %s %.6lluMB (%llu - %llu)\n", /* prefix disks that can be used to load modules with '*' */ ((fstype == FS_BSDFFS) || (fstype == FS_UNUSED) || (fstype == FS_VINUM)) ? '*' : ' ', prefix, 'a' + i, (fstype == FS_SWAP) ? "swap" : (fstype == FS_VINUM) ? "vinum" : (fstype == FS_HAMMER) ? "HAMMER" : (fstype == FS_HAMMER2) ? "HAMMER2" : (fstype == FS_JFS2) ? "JFS2" : (fstype == FS_ZFS) ? "ZFS" : (fstype == FS_BSDFFS) ? "FFS" : "(unknown)", (type==32)?(size / 2048):(size/1024/1024), offset, offset + size); } else { sprintf(line, "%c %s%c: %s\n", /* prefix disks that can be used to load modules with '*' */ ((fstype == FS_BSDFFS) || (fstype == FS_UNUSED) || (fstype == FS_VINUM)) ? '*' : ' ', prefix, 'a' + i, (fstype == FS_SWAP) ? "swap" : (fstype == FS_VINUM) ? "vinum" : (fstype == FS_HAMMER) ? "HAMMER" : (fstype == FS_HAMMER2) ? "HAMMER2" : (fstype == FS_JFS2) ? "JFS2" : (fstype == FS_ZFS) ? "ZFS" : (fstype == FS_BSDFFS) ? "FFS" : "(unknown)"); } pager_output(line); } } /* * Print out each valid partition in the disklabel of a FreeBSD slice. * For size calculations, we assume a 512 byte sector size. */ static void bd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix, int verbose) { char line[80]; char buf[BIOSDISK_SECSIZE*2]; struct disklabel32 *lp = NULL; struct disklabel64 *lp64 = NULL; int i; /* read disklabel */ if (bd_read(od, offset + LABELSECTOR32, 1, buf)) return; lp =(struct disklabel32 *)(&buf[0]); if (lp->d_magic != DISKMAGIC32) { if (bd_read(od, offset, 2, buf)) return; lp64 =(struct disklabel64 *)(&buf[0]); if (lp64->d_magic != DISKMAGIC64) { sprintf(line, "%s: bad disklabel\n", prefix); pager_output(line); return; } lp = NULL; /* PARANOID */ } if (lp64) { /* We got ourselves a disklabel64 here */ for (i = 0; i < lp64->d_npartitions; i++) { if (lp64->d_partitions[i].p_bsize == 0) continue; print_partition(lp64->d_partitions[i].p_fstype, lp64->d_partitions[i].p_boffset, lp64->d_partitions[i].p_bsize, i, od->od_flags, prefix, verbose, 64); } } else if (lp) { /* Print partitions */ for (i = 0; i < lp->d_npartitions; i++) { print_partition(lp->d_partitions[i].p_fstype, lp->d_partitions[i].p_offset, lp->d_partitions[i].p_size, i, od->od_flags, prefix, verbose, 32); } } } /* * Attempt to open the disk described by (dev) for use by (f). * * Note that the philosophy here is "give them exactly what * they ask for". This is necessary because being too "smart" * about what the user might want leads to complications. * (eg. given no slice or partition value, with a disk that is * sliced - are they after the first BSD slice, or the DOS * slice before it?) */ static int bd_open(struct open_file *f, ...) { va_list ap; struct i386_devdesc *dev; struct open_disk *od; int error; va_start(ap, f); dev = va_arg(ap, struct i386_devdesc *); va_end(ap); if ((error = bd_opendisk(&od, dev))) return(error); /* * Save our context */ ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od; DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff); return(0); } static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev) { struct dos_partition *dptr; struct disklabel32 *lp; struct disklabel64 *lp64; struct open_disk *od; int sector, slice, i; int error; static char buf[BUFSIZE]; if (dev->d_kind.biosdisk.unit >= nbdinfo) { DEBUG("attempt to open nonexistent disk"); return(ENXIO); } od = (struct open_disk *)malloc(sizeof(struct open_disk)); if (!od) { DEBUG("no memory"); return (ENOMEM); } /* Look up BIOS unit number, intialise open_disk structure */ od->od_dkunit = dev->d_kind.biosdisk.unit; od->od_unit = bdinfo[od->od_dkunit].bd_unit; od->od_flags = bdinfo[od->od_dkunit].bd_flags; od->od_boff = 0; od->od_nslices = 0; error = 0; DEBUG("open '%s', unit 0x%x slice %d partition %c", i386_fmtdev(dev), dev->d_kind.biosdisk.unit, dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition + 'a'); /* Get geometry for this open (removable device may have changed) */ if (bd_getgeom(od)) { DEBUG("can't get geometry"); error = ENXIO; goto out; } /* * Following calculations attempt to determine the correct value * for d->od_boff by looking for the slice and partition specified, * or searching for reasonable defaults. */ /* * Find the slice in the DOS slice table. */ if (bd_read(od, 0, 1, buf)) { DEBUG("error reading MBR"); error = EIO; goto out; } /* * Check the slice table magic. */ if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) { /* If a slice number was explicitly supplied, this is an error */ if (dev->d_kind.biosdisk.slice > 0) { DEBUG("no slice table/MBR (no magic)"); error = ENOENT; goto out; } sector = 0; goto unsliced; /* may be a floppy */ } /* * copy the partition table, then pick up any extended partitions. The * base partition table always has four entries, even if some of them * represented extended partitions. However, any additional sub-extended * partitions will be silently recursed and not included in the slice * table. */ bcopy(buf + DOSPARTOFF, &od->od_slicetab, sizeof(struct dos_partition) * NDOSPART); od->od_nslices = NDOSPART; dptr = &od->od_slicetab[0]; for (i = 0; i < NDOSPART; i++, dptr++) { if ((dptr->dp_typ == DOSPTYP_EXT) || (dptr->dp_typ == DOSPTYP_EXTLBA)) bd_chainextended(od, dptr->dp_start, 0); /* 1st offset is zero */ } od->od_flags |= BD_PARTTABOK; dptr = &od->od_slicetab[0]; /* * Overflow entries are not loaded into memory but we still keep * track of the count. Fix it up now. */ if (od->od_nslices > NEXTDOSPART) od->od_nslices = NEXTDOSPART; /* * Is this a request for the whole disk? */ if (dev->d_kind.biosdisk.slice == -1) { sector = 0; goto unsliced; } /* * if a slice number was supplied but not found, this is an error. */ if (dev->d_kind.biosdisk.slice > 0) { slice = dev->d_kind.biosdisk.slice - 1; if (slice >= od->od_nslices) { DEBUG("slice %d not found", slice); error = ENOENT; goto out; } } /* * Check for the historically bogus MBR found on true dedicated disks */ if ((dptr[3].dp_typ == DOSPTYP_386BSD || dptr[3].dp_typ == DOSPTYP_DFLYBSD) && (dptr[3].dp_start == 0) && (dptr[3].dp_size == 50000)) { sector = 0; goto unsliced; } /* Try to auto-detect the best slice; this should always give a slice number */ if (dev->d_kind.biosdisk.slice == 0) { slice = bd_bestslice(od); if (slice == -1) { error = ENOENT; goto out; } dev->d_kind.biosdisk.slice = slice; } dptr = &od->od_slicetab[0]; /* * Accept the supplied slice number unequivocally (we may be looking * at a DOS partition). */ dptr += (dev->d_kind.biosdisk.slice - 1); /* we number 1-4, offsets are 0-3 */ sector = dptr->dp_start; DEBUG("slice entry %d at %d, %d sectors", dev->d_kind.biosdisk.slice - 1, sector, dptr->dp_size); /* * If we are looking at a BSD slice, and the partition is < 0, * assume the 'a' partition */ if ((dptr->dp_typ == DOSPTYP_386BSD || dptr->dp_typ == DOSPTYP_DFLYBSD) && dev->d_kind.biosdisk.partition < 0) { dev->d_kind.biosdisk.partition = 0; } unsliced: /* * Now we have the slice offset, look for the partition in the disklabel if we have * a partition to start with. * * XXX we might want to check the label checksum. */ if (dev->d_kind.biosdisk.partition < 0) { od->od_boff = sector; /* no partition, must be after the slice */ DEBUG("opening raw slice"); } else { if (bd_read(od, sector + LABELSECTOR32, 1, buf)) { DEBUG("error reading disklabel"); error = EIO; goto out; } DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel32), buf + LABELOFFSET32, &od->od_disklabel); bcopy(buf + LABELOFFSET32, &od->od_disklabel, sizeof(struct disklabel32)); lp = &od->od_disklabel; if (lp->d_magic == DISKMAGIC32) { od->od_flags |= BD_LABELOK; if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) { DEBUG("partition '%c' exceeds partitions in table (a-'%c')", 'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions); error = EPART; goto out; } #ifdef DISK_DEBUG /* Complain if the partition is unused unless this is a floppy. */ if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) && !(od->od_flags & BD_FLOPPY)) DEBUG("warning, partition marked as unused"); #endif od->od_boff = lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset - lp->d_partitions[RAW_PART].p_offset + sector; goto out; } /* else maybe DISKLABEL64? */ if (bd_read(od, sector, (sizeof(od->od_disklabel64) + 511) / 512, buf)) { DEBUG("error reading disklabel"); error = EIO; goto out; } DEBUG("copy %d bytes of label from %p to %p", sizeof(od->od_disklabel64), buf, &od->od_disklabel64); bcopy(buf, &od->od_disklabel64, sizeof(od->od_disklabel64)); lp64 = &od->od_disklabel64; if (lp64->d_magic == DISKMAGIC64) { od->od_flags |= BD_LABELOK; if (dev->d_kind.biosdisk.partition >= lp64->d_npartitions || lp64->d_partitions[dev->d_kind.biosdisk.partition].p_bsize == 0) { DEBUG("partition '%c' exceeds partitions in table (a-'%c')", 'a' + dev->d_kind.biosdisk.partition, 'a' + lp64->d_npartitions); error = EPART; goto out; } od->od_boff = lp64->d_partitions[dev->d_kind.biosdisk.partition].p_boffset / 512 + sector; DEBUG("disklabel64 slice at %d", od->od_boff); } else { DEBUG("no disklabel"); error = ENOENT; } } out: if (error) { free(od); } else { *odp = od; /* return the open disk */ } return(error); } static void bd_chainextended(struct open_disk *od, u_int32_t base, u_int32_t offset) { char buf[BIOSDISK_SECSIZE]; struct dos_partition *dp1, *dp2; int i; if (bd_read(od, (daddr_t)(base + offset), 1, buf)) { printf("\nerror reading extended partition table"); return; } /* * dp1 points to the first record in the on-disk XPT, * dp2 points to the next entry in the in-memory parition table. * * NOTE: dp2 may be out of bounds if od_nslices >= NEXTDOSPART. * * NOTE: unlike the extended partitions in our primary dos partition * table, we do not record recursed extended partitions themselves * in our in-memory partition table. * * NOTE: recording within our in-memory table must be breadth first * ot match what the kernel does. Thus, two passes are required. * * NOTE: partitioning programs which support extended partitions seem * to always use the first entry for the user partition and the * second entry to chain, and also appear to disallow more then one * extended partition at each level. Nevertheless we make our code * somewhat more generic (and the same as the kernel's own slice * scan). */ dp1 = (struct dos_partition *)(&buf[DOSPARTOFF]); dp2 = &od->od_slicetab[od->od_nslices]; for (i = 0; i < NDOSPART; ++i, ++dp1) { if (dp1->dp_scyl == 0 && dp1->dp_shd == 0 && dp1->dp_ssect == 0 && dp1->dp_start == 0 && dp1->dp_size == 0) { continue; } if ((dp1->dp_typ == DOSPTYP_EXT) || (dp1->dp_typ == DOSPTYP_EXTLBA)) { /* * breadth first traversal, must skip in the * first pass */ continue; } /* * Only load up the in-memory data if we haven't overflowed * our in-memory array. */ if (od->od_nslices < NEXTDOSPART) { dp2->dp_typ = dp1->dp_typ; dp2->dp_start = base + offset + dp1->dp_start; dp2->dp_size = dp1->dp_size; } ++od->od_nslices; ++dp2; } /* * Pass 2 - handle extended partitions. Note that the extended * slice itself is not stored in the slice array when we recurse, * but any 'original' top-level extended slices are. This is to * match what the kernel does. */ dp1 -= NDOSPART; for (i = 0; i < NDOSPART; ++i, ++dp1) { if (dp1->dp_scyl == 0 && dp1->dp_shd == 0 && dp1->dp_ssect == 0 && dp1->dp_start == 0 && dp1->dp_size == 0) { continue; } if ((dp1->dp_typ == DOSPTYP_EXT) || (dp1->dp_typ == DOSPTYP_EXTLBA)) bd_chainextended(od, base, dp1->dp_start); } } /* * Search for a slice with the following preferences: * * 1: Active FreeBSD slice * 2: Non-active FreeBSD slice * 3: Active Linux slice * 4: non-active Linux slice * 5: Active FAT/FAT32 slice * 6: non-active FAT/FAT32 slice */ #define PREF_RAWDISK 0 #define PREF_FBSD_ACT 1 #define PREF_FBSD 2 #define PREF_LINUX_ACT 3 #define PREF_LINUX 4 #define PREF_DOS_ACT 5 #define PREF_DOS 6 #define PREF_NONE 7 /* * slicelimit is in the range 0 .. NDOSPART */ static int bd_bestslice(struct open_disk *od) { struct dos_partition *dp; int pref, preflevel; int i, prefslice; prefslice = 0; preflevel = PREF_NONE; dp = &od->od_slicetab[0]; for (i = 0; i < od->od_nslices; i++, dp++) { switch (dp->dp_typ) { case DOSPTYP_DFLYBSD: /* DragonFlyBSD */ case DOSPTYP_386BSD: /* FreeBSD and old DFlyBSD */ pref = dp->dp_flag & 0x80 ? PREF_FBSD_ACT : PREF_FBSD; break; case DOSPTYP_LINUX: pref = dp->dp_flag & 0x80 ? PREF_LINUX_ACT : PREF_LINUX; break; case 0x01: /* DOS/Windows */ case 0x04: case 0x06: case 0x0b: case 0x0c: case 0x0e: pref = dp->dp_flag & 0x80 ? PREF_DOS_ACT : PREF_DOS; break; default: pref = PREF_NONE; } if (pref < preflevel) { preflevel = pref; prefslice = i + 1; } } return (prefslice); } static int bd_close(struct open_file *f) { struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data); bd_closedisk(od); return(0); } static void bd_closedisk(struct open_disk *od) { DEBUG("open_disk %p", od); #if 0 /* XXX is this required? (especially if disk already open...) */ if (od->od_flags & BD_FLOPPY) delay(3000000); #endif free(od); } static int bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize) { struct bcache_devdata bcd; struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data); bcd.dv_strategy = bd_realstrategy; bcd.dv_devdata = devdata; return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, size, buf, rsize)); } static int bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize) { struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data); int blks; #ifdef BD_SUPPORT_FRAGS char fragbuf[BIOSDISK_SECSIZE]; size_t fragsize; fragsize = size % BIOSDISK_SECSIZE; #else if (size % BIOSDISK_SECSIZE) panic("bd_strategy: %d bytes I/O not multiple of block size", size); #endif DEBUG("open_disk %p", od); switch(rw){ case F_READ: blks = size / BIOSDISK_SECSIZE; DEBUG("read %d from %d to %p", blks, dblk, buf); if (rsize) *rsize = 0; if (blks && bd_read(od, dblk, blks, buf)) { DEBUG("read error"); return (EIO); } #ifdef BD_SUPPORT_FRAGS DEBUG("bd_strategy: frag read %d from %d+%d to %p", fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE)); if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) { DEBUG("frag read error"); return(EIO); } bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize); #endif if (rsize) *rsize = size; return (0); case F_WRITE : blks = size / BIOSDISK_SECSIZE; DEBUG("write %d from %d to %p", blks, dblk, buf); if (rsize) *rsize = 0; if (blks && bd_write(od, dblk, blks, buf)) { DEBUG("write error"); return (EIO); } #ifdef BD_SUPPORT_FRAGS if(fragsize) { DEBUG("Attempted to write a frag"); return (EIO); } #endif if (rsize) *rsize = size; return (0); default: break; /* DO NOTHING */ } return EROFS; } static int bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest) { u_int x, bpc, cyl, hd, sec, result, resid, retry, maxfer; caddr_t p, xp, bbuf, breg; /* Just in case some idiot actually tries to read -1 blocks... */ if (blks < 0) return (-1); bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */ resid = blks; p = dest; /* * Always bounce. Our buffer is probably not segment-addressable. */ if (1) { /* * There is a 64k physical boundary somewhere in the destination * buffer, so we have to arrange a suitable bounce buffer. Allocate * a buffer twice as large as we need to. Use the bottom half unless * there is a break there, in which case we use the top half. */ bbuf = bounce_base; x = min(BOUNCEBUF_SECTS / 2, (unsigned)blks); if (((u_int32_t)VTOP(bbuf) & 0xffff8000) == ((u_int32_t)VTOP(bbuf + x * BIOSDISK_SECSIZE - 1) & 0xffff8000)) { breg = bbuf; } else { breg = bbuf + x * BIOSDISK_SECSIZE; } maxfer = x; /* limit transfers to bounce region size */ } else { breg = bbuf = NULL; maxfer = 0; } while (resid > 0) { x = dblk; cyl = x / bpc; /* block # / blocks per cylinder */ x %= bpc; /* block offset into cylinder */ hd = x / od->od_sec; /* offset / blocks per track */ sec = x % od->od_sec; /* offset into track */ /* play it safe and don't cross track boundaries (XXX this is probably unnecessary) */ x = szmin(od->od_sec - sec, resid); if (maxfer > 0) x = min(x, maxfer); /* fit bounce buffer */ /* where do we transfer to? */ xp = (bbuf == NULL ? p : breg); /* correct sector number for 1-based BIOS numbering */ sec++; /* * Loop retrying the operation a couple of times. The BIOS may also * retry. */ for (retry = 0; retry < 3; retry++) { /* * If retrying, reset the drive. */ if (retry > 0) { v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0; v86.edx = od->od_unit; v86int(); } /* * Always use EDD if the disk supports it, otherwise fall back * to CHS mode (returning an error if the cylinder number is * too large). */ if (od->od_flags & BD_MODEEDD1) { static unsigned short packet[8]; packet[0] = 0x10; packet[1] = x; packet[2] = VTOPOFF(xp); packet[3] = VTOPSEG(xp); packet[4] = dblk & 0xffff; packet[5] = dblk >> 16; packet[6] = 0; packet[7] = 0; v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x4200; v86.edx = od->od_unit; v86.ds = VTOPSEG(packet); v86.esi = VTOPOFF(packet); v86int(); result = (v86.efl & PSL_C); if (result == 0) break; } else if (cyl < 1024) { /* Use normal CHS addressing */ v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x200 | x; v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec; v86.edx = (hd << 8) | od->od_unit; v86.es = VTOPSEG(xp); v86.ebx = VTOPOFF(xp); v86int(); result = (v86.efl & PSL_C); if (result == 0) break; } else { result = 1; break; } } DEBUG("%u sectors from %u/%u/%d to %p (0x%x) %s", x, cyl, hd, sec - 1, p, VTOP(p), result ? "failed" : "ok"); /* BUG here, cannot use v86 in printf because putchar uses it too */ DEBUG("ax = 0x%04x cx = 0x%04x dx = 0x%04x status 0x%x", 0x200 | x, ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec, (hd << 8) | od->od_unit, (v86.eax >> 8) & 0xff); if (result) return(-1); if (bbuf != NULL) bcopy(breg, p, x * BIOSDISK_SECSIZE); p += (x * BIOSDISK_SECSIZE); dblk += x; resid -= x; } /* hexdump(dest, (blks * BIOSDISK_SECSIZE)); */ return(0); } static int bd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest) { u_int x, bpc, cyl, hd, sec, result, resid, retry, maxfer; caddr_t p, xp, bbuf, breg; /* Just in case some idiot actually tries to read -1 blocks... */ if (blks < 0) return (-1); bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */ resid = blks; p = dest; /* * Always bounce. Our buffer is probably not segment-addressable. */ if (1) { /* * There is a 64k physical boundary somewhere in the destination * buffer, so we have to arrange a suitable bounce buffer. Allocate * a buffer twice as large as we need to. Use the bottom half * unless there is a break there, in which case we use the top half. */ bbuf = bounce_base; x = min(BOUNCEBUF_SECTS / 2, (unsigned)blks); if (((u_int32_t)VTOP(bbuf) & 0xffff8000) == ((u_int32_t)VTOP(bbuf + x * BIOSDISK_SECSIZE - 1) & 0xffff8000)) { breg = bbuf; } else { breg = bbuf + x * BIOSDISK_SECSIZE; } maxfer = x; /* limit transfers to bounce region size */ } else { breg = bbuf = NULL; maxfer = 0; } while (resid > 0) { x = dblk; cyl = x / bpc; /* block # / blocks per cylinder */ x %= bpc; /* block offset into cylinder */ hd = x / od->od_sec; /* offset / blocks per track */ sec = x % od->od_sec; /* offset into track */ /* play it safe and don't cross track boundaries (XXX this is probably unnecessary) */ x = szmin(od->od_sec - sec, resid); if (maxfer > 0) x = szmin(x, maxfer); /* fit bounce buffer */ /* where do we transfer to? */ xp = (bbuf == NULL ? p : breg); /* correct sector number for 1-based BIOS numbering */ sec++; /* Put your Data In, Put your Data out, Put your Data In, and shake it all about */ if (bbuf != NULL) bcopy(p, breg, x * BIOSDISK_SECSIZE); p += (x * BIOSDISK_SECSIZE); dblk += x; resid -= x; /* * Loop retrying the operation a couple of times. The BIOS may also * retry. */ for (retry = 0; retry < 3; retry++) { /* * If retrying, reset the drive. */ if (retry > 0) { v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0; v86.edx = od->od_unit; v86int(); } /* * Always use EDD if the disk supports it, otherwise fall back * to CHS mode (returning an error if the cylinder number is * too large). */ if (od->od_flags & BD_MODEEDD1) { static unsigned short packet[8]; packet[0] = 0x10; packet[1] = x; packet[2] = VTOPOFF(xp); packet[3] = VTOPSEG(xp); packet[4] = dblk & 0xffff; packet[5] = dblk >> 16; packet[6] = 0; packet[7] = 0; v86.ctl = V86_FLAGS; v86.addr = 0x13; /* Should we Write with verify ?? 0x4302 ? */ v86.eax = 0x4300; v86.edx = od->od_unit; v86.ds = VTOPSEG(packet); v86.esi = VTOPOFF(packet); v86int(); result = (v86.efl & PSL_C); if (result == 0) break; } else if (cyl < 1024) { /* Use normal CHS addressing */ v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x300 | x; v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec; v86.edx = (hd << 8) | od->od_unit; v86.es = VTOPSEG(xp); v86.ebx = VTOPOFF(xp); v86int(); result = (v86.efl & PSL_C); if (result == 0) break; } else { result = 1; break; } } DEBUG("%u sectors from %u/%u/%d to %p (0x%x) %s", x, cyl, hd, sec - 1, p, VTOP(p), result ? "failed" : "ok"); /* BUG here, cannot use v86 in printf because putchar uses it too */ DEBUG("ax = 0x%04x cx = 0x%04x dx = 0x%04x status 0x%x", 0x200 | x, ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec, (hd << 8) | od->od_unit, (v86.eax >> 8) & 0xff); if (result) return(-1); } /* hexdump(dest, (blks * BIOSDISK_SECSIZE)); */ return(0); } static int bd_getgeom(struct open_disk *od) { v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x800; v86.edx = od->od_unit; v86int(); if ((v86.efl & PSL_C) || /* carry set */ ((v86.edx & 0xff) <= (unsigned)(od->od_unit & 0x7f))) /* unit # bad */ return(1); /* convert max cyl # -> # of cylinders */ od->od_cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1; /* convert max head # -> # of heads */ od->od_hds = ((v86.edx & 0xff00) >> 8) + 1; od->od_sec = v86.ecx & 0x3f; DEBUG("unit 0x%x geometry %d/%d/%d", od->od_unit, od->od_cyl, od->od_hds, od->od_sec); return(0); } /* * Return the BIOS geometry of a given "fixed drive" in a format * suitable for the legacy bootinfo structure. Since the kernel is * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we * prefer to get the information directly, rather than rely on being * able to put it together from information already maintained for * different purposes and for a probably different number of drives. * * For valid drives, the geometry is expected in the format (31..0) * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are * indicated by returning the geometry of a "1.2M" PC-format floppy * disk. And, incidentally, what is returned is not the geometry as * such but the highest valid cylinder, head, and sector numbers. */ u_int32_t bd_getbigeom(int bunit) { v86.ctl = V86_FLAGS; v86.addr = 0x13; v86.eax = 0x800; v86.edx = 0x80 + bunit; v86int(); if (v86.efl & PSL_C) return 0x4f010f; return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) | (v86.edx & 0xff00) | (v86.ecx & 0x3f); } /* * Return a suitable cdev_t value for (dev). * * In the case where it looks like (dev) is a SCSI disk, we allow the number of * IDE disks to be specified in $num_ide_disks. There should be a Better Way. */ int bd_getdev(struct i386_devdesc *dev) { struct open_disk *od; int biosdev; int major; int rootdev; char *nip, *cp; int unitofs = 0, i, unit; biosdev = bd_unit2bios(dev->d_kind.biosdisk.unit); DEBUG("unit %d BIOS device %d", dev->d_kind.biosdisk.unit, biosdev); if (biosdev == -1) /* not a BIOS device */ return(-1); if (bd_opendisk(&od, dev) != 0) /* oops, not a viable device */ return(-1); if (biosdev < 0x80) { /* floppy (or emulated floppy) or ATAPI device */ if (bdinfo[dev->d_kind.biosdisk.unit].bd_type == DT_ATAPI) { /* is an ATAPI disk */ major = WFDMAJOR; } else { /* is a floppy disk */ major = FDMAJOR; } } else { /* harddisk */ if ((od->od_flags & BD_LABELOK) && (od->od_disklabel.d_type == DTYPE_SCSI)) { /* label OK, disk labelled as SCSI */ major = DAMAJOR; /* check for unit number correction hint, now deprecated */ if ((nip = getenv("num_ide_disks")) != NULL) { i = strtol(nip, &cp, 0); /* check for parse error */ if ((cp != nip) && (*cp == 0)) unitofs = i; } } else { /* assume an IDE disk */ major = WDMAJOR; } } /* default root disk unit number */ unit = (biosdev & 0x7f) - unitofs; /* XXX a better kludge to set the root disk unit number */ if ((nip = getenv("root_disk_unit")) != NULL) { i = strtol(nip, &cp, 0); /* check for parse error */ if ((cp != nip) && (*cp == 0)) unit = i; } rootdev = MAKEBOOTDEV(major, dev->d_kind.biosdisk.slice + 1, unit, dev->d_kind.biosdisk.partition); DEBUG("dev is 0x%x\n", rootdev); return(rootdev); }