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https://github.com/freebsd/freebsd-src
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cab57be9ae
Do a much better job of DWIM with partial device specifications. Fix the module metadata build process, which was completely broken. Use a larger read buffer when copying large objects in; this improves performance marginally and will avoid flushning any small caches we might choose to implement.
698 lines
18 KiB
C
698 lines
18 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 1.11 1998/10/06 07:27:05 msmith 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[NDOSPART]; /* XXX needs to grow for extended partitions */
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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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static int bd_bestslice(struct dos_partition *dptr);
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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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DEBUG("looking for bios device 0x%x", biosdev);
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for (i = 0; i < nbdinfo; i++) {
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DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit);
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if (bdinfo[i].bd_unit == biosdev)
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return(i);
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}
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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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daddr_t pref_slice[4];
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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) * NDOSPART);
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dptr = &od->od_parttab[0];
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od->od_flags |= BD_PARTTABOK;
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/* Try to auto-detect the best slice; this should always give a slice number */
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if (dev->d_kind.biosdisk.slice < 1)
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dev->d_kind.biosdisk.slice = bd_bestslice(dptr);
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switch (dev->d_kind.biosdisk.slice) {
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case -1:
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error = ENOENT;
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goto out;
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case 0:
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goto unsliced;
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default:
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break;
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}
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/*
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* Accept the supplied slice number unequivocally (we may be looking
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* at a DOS partition).
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*/
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dptr += (dev->d_kind.biosdisk.slice - 1); /* we number 1-4, offsets are 0-3 */
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sector = dptr->dp_start;
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DEBUG("slice entry %d at %d, %d sectors", dev->d_kind.biosdisk.slice - 1, sector, dptr->dp_size);
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/*
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* If we are looking at a BSD slice, and the partition is < 0, assume the 'a' partition
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*/
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if ((dptr->dp_typ == DOSPTYP_386BSD) && (dev->d_kind.biosdisk.partition < 0))
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dev->d_kind.biosdisk.partition = 0;
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unsliced:
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/*
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* Now we have the slice offset, 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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/*
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* Search for a slice with the following preferences:
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*
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* 1: Active FreeBSD slice
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* 2: Non-active FreeBSD slice
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* 3: Active FAT/FAT32 slice
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* 4: non-active FAT/FAT32 slice
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*/
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#define PREF_FBSD_ACT 0
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#define PREF_FBSD 1
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#define PREF_DOS_ACT 2
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#define PREF_DOS 3
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#define PREF_NONE 4
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static int
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bd_bestslice(struct dos_partition *dptr)
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{
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int i;
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int preflevel, pref;
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/*
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* Check for the historically bogus MBR found on true dedicated disks
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*/
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if ((dptr[3].dp_typ == DOSPTYP_386BSD) &&
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(dptr[3].dp_start == 0) &&
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(dptr[3].dp_size == 50000))
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return(0);
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preflevel = PREF_NONE;
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pref = -1;
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/*
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* XXX No support here for 'extended' slices
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*/
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for (i = 0; i < NDOSPART; i++) {
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switch(dptr[i].dp_typ) {
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case DOSPTYP_386BSD: /* FreeBSD */
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if ((dptr[i].dp_flag & 0x80) && (preflevel > PREF_FBSD_ACT)) {
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pref = i;
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preflevel = PREF_FBSD_ACT;
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} else if (preflevel > PREF_FBSD) {
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pref = i;
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preflevel = PREF_FBSD;
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}
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break;
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case 0x04: /* DOS/Windows */
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case 0x06:
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case 0x0b:
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case 0x0c:
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case 0x0e:
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case 0x63:
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if ((dptr[i].dp_flag & 0x80) && (preflevel > PREF_DOS_ACT)) {
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pref = i;
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preflevel = PREF_DOS_ACT;
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} else if (preflevel > PREF_DOS) {
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pref = i;
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preflevel = PREF_DOS;
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}
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break;
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}
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}
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return(pref + 1); /* slices numbered 1-4 */
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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",
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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)
|
|
*rsize = size;
|
|
return (0);
|
|
}
|
|
|
|
/* Max number of sectors to bounce-buffer if the request crosses a 64k boundary */
|
|
#define FLOPPY_BOUNCEBUF 18
|
|
|
|
static int
|
|
bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
|
|
{
|
|
int x, bpc, cyl, hd, sec, result, resid, cnt, retry, maxfer;
|
|
caddr_t p, xp, bbuf, breg;
|
|
|
|
bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */
|
|
resid = blks;
|
|
p = dest;
|
|
|
|
/* Decide whether we have to bounce */
|
|
if ((od->od_unit < 0x80) &&
|
|
((VTOP(dest) >> 16) != (VTOP(dest + blks * BIOSDISK_SECSIZE) >> 16))) {
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
x = min(FLOPPY_BOUNCEBUF, blks);
|
|
bbuf = malloc(x * 2 * BIOSDISK_SECSIZE);
|
|
if (((u_int32_t)VTOP(bbuf) & 0xffff0000) == ((u_int32_t)VTOP(dest + x * BIOSDISK_SECSIZE) & 0xffff0000)) {
|
|
breg = bbuf;
|
|
} else {
|
|
breg = bbuf + x * BIOSDISK_SECSIZE;
|
|
}
|
|
maxfer = x; /* limit transfers to bounce region size */
|
|
} else {
|
|
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 = min(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();
|
|
}
|
|
|
|
/* 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",
|
|
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;
|
|
int rootdev;
|
|
|
|
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;
|
|
} else {
|
|
/* assume an IDE disk */
|
|
major = WDMAJOR;
|
|
}
|
|
}
|
|
rootdev = 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);
|
|
DEBUG("dev is 0x%x\n", rootdev);
|
|
return(rootdev);
|
|
}
|
|
|
|
/*
|
|
* Fix (dev) so that it refers to the 'real' disk/slice/partition that it implies.
|
|
*/
|
|
int
|
|
bd_fixupdev(struct i386_devdesc *dev)
|
|
{
|
|
struct open_disk *od;
|
|
|
|
/*
|
|
* Open the disk. This will fix up the slice and partition fields.
|
|
*/
|
|
if (bd_opendisk(&od, dev) != 0)
|
|
return(ENOENT);
|
|
|
|
bd_closedisk(od);
|
|
}
|