6b15efd961
Use bd_getdev() to work out a dev_t for the root device. Allow $rootdev to override $currdev as the root device. biosdisk.c Save the slice table and disklabel when opening a disk. Add bd_getdev(), which attempts to return a dev_t corresponding to a given device. Cases which it still doesn't get right: - The inevitable da-when-wd-also-exists - Disks with no slice table (the slice number is not set correctly) The first is difficult to get right, the second will be fixed in an upcoming commit. comconsole.c vidconsole.c getchar() should return an 8-bit value; some BIOSsen pack extra information in %eax. libi386.h Remove some stale prototypes, add new ones.
609 lines
16 KiB
C
609 lines
16 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: biosdisk.c,v 1.8 1998/09/28 20:08:34 peter Exp $
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*/
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/*
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* BIOS disk device handling.
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*
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* Ideas and algorithms from:
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*
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* - NetBSD libi386/biosdisk.c
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* - FreeBSD biosboot/disk.c
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*
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* XXX Todo: add bad144 support.
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*/
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#include <stand.h>
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#include <sys/disklabel.h>
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#include <sys/diskslice.h>
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#include <sys/reboot.h>
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#include <bootstrap.h>
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#include <btxv86.h>
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#include "libi386.h"
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#define BIOSDISK_SECSIZE 512
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#define BUFSIZE (1 * BIOSDISK_SECSIZE)
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#define MAXBDDEV MAXDEV
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#define DT_ATAPI 0x10 /* disk type for ATAPI floppies */
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#define WDMAJOR 0 /* major numbers for devices we frontend for */
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#define WFDMAJOR 1
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#define FDMAJOR 2
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#define DAMAJOR 4
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#ifdef DISK_DEBUG
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# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __FUNCTION__ , ## args)
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#else
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# define DEBUG(fmt, args...)
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#endif
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struct open_disk {
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int od_dkunit; /* disk unit number */
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int od_unit; /* BIOS unit number */
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int od_cyl; /* BIOS geometry */
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int od_hds;
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int od_sec;
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int od_boff; /* block offset from beginning of BIOS disk */
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int od_flags;
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#define BD_MODEMASK 0x3
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#define BD_MODEINT13 0x0
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#define BD_MODEEDD1 0x1
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#define BD_MODEEDD3 0x2
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#define BD_FLOPPY (1<<2)
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struct disklabel od_disklabel;
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struct dos_partition od_parttab;
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#define BD_LABELOK (1<<3)
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#define BD_PARTTABOK (1<<4)
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};
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/*
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* List of BIOS devices, translation from disk unit number to
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* BIOS unit number.
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*/
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static struct bdinfo
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{
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int bd_unit; /* BIOS unit number */
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int bd_flags;
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int bd_type; /* BIOS 'drive type' (floppy only) */
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} bdinfo [MAXBDDEV];
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static int nbdinfo = 0;
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static int bd_getgeom(struct open_disk *od);
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static int bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest);
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static int bd_int13probe(struct bdinfo *bd);
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static int bd_init(void);
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static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize);
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static int bd_open(struct open_file *f, void *vdev);
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static int bd_close(struct open_file *f);
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struct devsw biosdisk = {
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"disk",
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DEVT_DISK,
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bd_init,
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bd_strategy,
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bd_open,
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bd_close,
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noioctl
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};
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static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev);
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static void bd_closedisk(struct open_disk *od);
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/*
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* Translate between BIOS device numbers and our private unit numbers.
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*/
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int
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bd_bios2unit(int biosdev)
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{
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int i;
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for (i = 0; i < nbdinfo; i++)
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if (bdinfo[i].bd_unit == biosdev)
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return(i);
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return(-1);
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}
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int
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bd_unit2bios(int unit)
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{
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if ((unit >= 0) && (unit < nbdinfo))
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return(bdinfo[unit].bd_unit);
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return(-1);
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}
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/*
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* Quiz the BIOS for disk devices, save a little info about them.
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*
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* XXX should we be consulting the BIOS equipment list, specifically
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* the value at 0x475?
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*/
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static int
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bd_init(void)
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{
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int base, unit;
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/* sequence 0, 0x80 */
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for (base = 0; base <= 0x80; base += 0x80) {
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for (unit = base; (nbdinfo < MAXBDDEV); unit++) {
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bdinfo[nbdinfo].bd_unit = unit;
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bdinfo[nbdinfo].bd_flags = (unit < 0x80) ? BD_FLOPPY : 0;
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/* XXX add EDD probes */
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if (!bd_int13probe(&bdinfo[nbdinfo]))
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break;
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/* XXX we need "disk aliases" to make this simpler */
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printf("BIOS drive %c: is disk%d\n",
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(unit < 0x80) ? ('A' + unit) : ('C' + unit - 0x80), nbdinfo);
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bdinfo[nbdinfo].bd_unit = unit;
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nbdinfo++;
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}
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}
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return(0);
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}
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/*
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* Try to detect a device supported by the legacy int13 BIOS
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*/
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static int
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bd_int13probe(struct bdinfo *bd)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x800;
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v86.edx = bd->bd_unit;
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v86int();
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if (!(v86.efl & 0x1) && /* carry clear */
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((v86.edx & 0xff) > (bd->bd_unit & 0x7f))) { /* unit # OK */
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bd->bd_flags |= BD_MODEINT13;
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bd->bd_type = v86.ebx & 0xff;
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return(1);
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}
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return(0);
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}
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/*
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* Attempt to open the disk described by (dev) for use by (f).
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*
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* Note that the philosophy here is "give them exactly what
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* they ask for". This is necessary because being too "smart"
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* about what the user might want leads to complications.
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* (eg. given no slice or partition value, with a disk that is
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* sliced - are they after the first BSD slice, or the DOS
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* slice before it?)
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*/
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static int
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bd_open(struct open_file *f, void *vdev)
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{
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struct i386_devdesc *dev = (struct i386_devdesc *)vdev;
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struct open_disk *od;
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int error;
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if ((error = bd_opendisk(&od, dev)))
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return(error);
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/*
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* Save our context
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*/
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((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
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DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
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return(0);
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}
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static int
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bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev)
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{
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struct dos_partition *dptr;
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struct disklabel *lp;
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struct open_disk *od;
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int sector, slice, i;
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int error;
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u_char buf[BUFSIZE];
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if (dev->d_kind.biosdisk.unit >= nbdinfo) {
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DEBUG("attempt to open nonexistent disk");
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return(ENXIO);
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}
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od = (struct open_disk *)malloc(sizeof(struct open_disk));
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if (!od) {
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DEBUG("no memory");
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return (ENOMEM);
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}
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/* Look up BIOS unit number, intialise open_disk structure */
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od->od_dkunit = dev->d_kind.biosdisk.unit;
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od->od_unit = bdinfo[od->od_dkunit].bd_unit;
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od->od_flags = bdinfo[od->od_dkunit].bd_flags;
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od->od_boff = 0;
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error = 0;
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DEBUG("open '%s', unit 0x%x slice %d partition %c",
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i386_fmtdev(dev), dev->d_kind.biosdisk.unit,
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dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition + 'a');
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/* Get geometry for this open (removable device may have changed) */
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if (bd_getgeom(od)) {
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DEBUG("can't get geometry");
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error = ENXIO;
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goto out;
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}
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/*
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* Following calculations attempt to determine the correct value
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* for d->od_boff by looking for the slice and partition specified,
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* or searching for reasonable defaults.
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*/
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/*
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* Find the slice in the DOS slice table.
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*/
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if (bd_read(od, 0, 1, buf)) {
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DEBUG("error reading MBR");
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error = EIO;
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goto out;
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}
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/*
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* Check the slice table magic.
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*/
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if ((buf[0x1fe] != 0x55) || (buf[0x1ff] != 0xaa)) {
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/* If a slice number was explicitly supplied, this is an error */
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if (dev->d_kind.biosdisk.slice > 0) {
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DEBUG("no slice table/MBR (no magic)");
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error = ENOENT;
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goto out;
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}
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sector = 0;
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goto unsliced; /* may be a floppy */
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}
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bcopy(buf + DOSPARTOFF, &od->od_parttab, sizeof(struct dos_partition));
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dptr = &od->od_parttab;
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od->od_flags |= BD_PARTTABOK;
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/*
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* XXX No support here for 'extended' slices
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*/
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if (dev->d_kind.biosdisk.slice <= 0) {
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/*
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* Search for the first FreeBSD slice; this also works on "unsliced"
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* disks, as they contain a "historically bogus" MBR.
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*/
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for (i = 0; i < NDOSPART; i++, dptr++)
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if (dptr->dp_typ == DOSPTYP_386BSD) {
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sector = dptr->dp_start;
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break;
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}
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/* Did we find something? */
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if (sector == -1) {
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error = ENOENT;
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goto out;
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}
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} else {
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/*
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* Accept the supplied slice number unequivocally (we may be looking
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* for a DOS partition) if we can handle it.
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*/
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if ((dev->d_kind.biosdisk.slice > NDOSPART) || (dev->d_kind.biosdisk.slice < 1)) {
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error = ENOENT;
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goto out;
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}
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dptr += (dev->d_kind.biosdisk.slice - 1);
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sector = dptr->dp_start;
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}
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unsliced:
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/*
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* Now we have the slice, look for the partition in the disklabel if we have
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* a partition to start with.
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*
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* XXX we might want to check the label checksum.
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*/
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if (dev->d_kind.biosdisk.partition < 0) {
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od->od_boff = sector; /* no partition, must be after the slice */
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DEBUG("opening raw slice");
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} else {
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if (bd_read(od, sector + LABELSECTOR, 1, buf)) {
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DEBUG("error reading disklabel");
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error = EIO;
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goto out;
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}
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DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
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bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
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lp = &od->od_disklabel;
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od->od_flags |= BD_LABELOK;
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if (lp->d_magic != DISKMAGIC) {
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DEBUG("no disklabel");
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error = ENOENT;
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goto out;
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}
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if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) {
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DEBUG("partition '%c' exceeds partitions in table (a-'%c')",
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'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions);
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error = EPART;
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goto out;
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}
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/* Complain if the partition type is wrong */
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if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) &&
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!(od->od_flags & BD_FLOPPY)) /* Floppies often have bogus fstype */
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DEBUG("warning, partition marked as unused");
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od->od_boff = lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset;
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}
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out:
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if (error) {
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free(od);
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} else {
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*odp = od; /* return the open disk */
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}
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return(error);
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}
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static int
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bd_close(struct open_file *f)
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{
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struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
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bd_closedisk(od);
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return(0);
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}
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static void
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bd_closedisk(struct open_disk *od)
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{
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DEBUG("open_disk %p", od);
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#if 0
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/* XXX is this required? (especially if disk already open...) */
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if (od->od_flags & BD_FLOPPY)
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delay(3000000);
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#endif
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free(od);
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}
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static int
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bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, void *buf, size_t *rsize)
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{
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struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
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int blks;
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#ifdef BD_SUPPORT_FRAGS
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char fragbuf[BIOSDISK_SECSIZE];
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size_t fragsize;
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fragsize = size % BIOSDISK_SECSIZE;
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#else
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if (size % BIOSDISK_SECSIZE)
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panic("bd_strategy: %d bytes I/O not multiple of block size", size);
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#endif
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DEBUG("open_disk %p", od);
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if (rw != F_READ)
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return(EROFS);
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blks = size / BIOSDISK_SECSIZE;
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DEBUG("read %d from %d+%d to %p", blks, od->od_boff, dblk, buf);
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if (rsize)
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*rsize = 0;
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if (blks && bd_read(od, dblk + od->od_boff, blks, buf)) {
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DEBUG("read error");
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return (EIO);
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}
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#ifdef BD_SUPPORT_FRAGS
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DEBUG("bd_strategy: frag read %d from %d+%d+d to %p\n",
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fragsize, od->od_boff, dblk, blks, buf + (blks * BIOSDISK_SECSIZE));
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if (fragsize && bd_read(od, dblk + od->od_boff + blks, 1, fragsize)) {
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DEBUG("frag read error");
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return(EIO);
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}
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bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize);
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#endif
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if (rsize)
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*rsize = size;
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return (0);
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}
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/* Max number of sectors to bounce-buffer if the request crosses a 64k boundary */
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#define FLOPPY_BOUNCEBUF 18
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static int
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bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
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{
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int x, bpc, cyl, hd, sec, result, resid, cnt, retry, maxfer;
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caddr_t p, xp, bbuf, breg;
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bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */
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resid = blks;
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p = dest;
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/* Decide whether we have to bounce */
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if ((od->od_unit < 0x80) &&
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((VTOP(dest) >> 16) != (VTOP(dest + blks * BIOSDISK_SECSIZE) >> 16))) {
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/*
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* There is a 64k physical boundary somewhere in the destination buffer, so we have
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* to arrange a suitable bounce buffer. Allocate a buffer twice as large as we
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* need to. Use the bottom half unless there is a break there, in which case we
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* use the top half.
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*/
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x = min(FLOPPY_BOUNCEBUF, blks);
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bbuf = malloc(x * 2 * BIOSDISK_SECSIZE);
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if (((u_int32_t)VTOP(bbuf) & 0xffff0000) == ((u_int32_t)VTOP(dest + x * BIOSDISK_SECSIZE) & 0xffff0000)) {
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breg = bbuf;
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} else {
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breg = bbuf + x * BIOSDISK_SECSIZE;
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}
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maxfer = x; /* limit transfers to bounce region size */
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} else {
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bbuf = NULL;
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maxfer = 0;
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}
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while (resid > 0) {
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x = dblk;
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cyl = x / bpc; /* block # / blocks per cylinder */
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x %= bpc; /* block offset into cylinder */
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hd = x / od->od_sec; /* offset / blocks per track */
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sec = x % od->od_sec; /* offset into track */
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/* play it safe and don't cross track boundaries (XXX this is probably unnecessary) */
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x = min(od->od_sec - sec, resid);
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if (maxfer > 0)
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x = min(x, maxfer); /* fit bounce buffer */
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/* where do we transfer to? */
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xp = bbuf == NULL ? p : breg;
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/* correct sector number for 1-based BIOS numbering */
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sec++;
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|
|
/* 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();
|
|
}
|
|
|
|
/* build request XXX support EDD requests too */
|
|
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 & 0x1);
|
|
if (result == 0)
|
|
break;
|
|
}
|
|
|
|
DEBUG("%d sectors from %d/%d/%d to %p (0x%x) %s", x, cyl, hd, sec - 1, p, VTOP(p), result ? "failed" : "ok");
|
|
DEBUG("ax = 0x%04x cx = 0x%04x dx = 0x%04x status 0x%x\n",
|
|
0x200 | x, ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec, (hd << 8) | od->od_unit, (v86.eax >> 8) & 0xff);
|
|
if (result) {
|
|
if (bbuf != NULL)
|
|
free(bbuf);
|
|
return(-1);
|
|
}
|
|
if (bbuf != NULL)
|
|
bcopy(breg, p, x * BIOSDISK_SECSIZE);
|
|
p += (x * BIOSDISK_SECSIZE);
|
|
dblk += x;
|
|
resid -= x;
|
|
}
|
|
|
|
/* hexdump(dest, (blks * BIOSDISK_SECSIZE)); */
|
|
if (bbuf != NULL)
|
|
free(bbuf);
|
|
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 & 0x1) || /* carry set */
|
|
((v86.edx & 0xff) <= (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 a suitable dev_t value for (dev)
|
|
*/
|
|
int
|
|
bd_getdev(struct i386_devdesc *dev)
|
|
{
|
|
struct open_disk *od;
|
|
int biosdev;
|
|
int major;
|
|
|
|
biosdev = bd_unit2bios(dev->d_kind.biosdisk.unit);
|
|
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;
|
|
} else {
|
|
/* assume an IDE disk */
|
|
major = WDMAJOR;
|
|
}
|
|
}
|
|
return(MAKEBOOTDEV(major,
|
|
(dev->d_kind.biosdisk.slice + 1) >> 4, /* XXX slices may be wrong here */
|
|
(dev->d_kind.biosdisk.slice + 1) & 0xf,
|
|
biosdev & 0x7f, /* XXX allow/compute shift for da when wd present */
|
|
dev->d_kind.biosdisk.partition));
|
|
}
|