1087 lines
28 KiB
C
1087 lines
28 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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*/
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#include <stand.h>
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#include <sys/disklabel.h>
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#include <sys/diskpc98.h>
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#include <machine/bootinfo.h>
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#include <stdarg.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 BIOS_NUMDRIVES 0x475
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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" , __func__ , ## 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_MODEINT13 0x0000
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#define BD_MODEEDD1 0x0001
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#define BD_MODEEDD3 0x0002
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#define BD_MODEMASK 0x0003
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#define BD_FLOPPY 0x0004
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#define BD_LABELOK 0x0008
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#define BD_PARTTABOK 0x0010
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#define BD_OPTICAL 0x0020
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struct disklabel od_disklabel;
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int od_nslices; /* slice count */
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struct pc98_partition od_slicetab[NDOSPART];
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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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int bd_da_unit; /* kernel unit number for da */
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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,
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caddr_t dest);
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static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
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caddr_t dest);
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static int bd_int13probe(struct bdinfo *bd);
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static void bd_printslice(struct open_disk *od, struct pc98_partition *dp,
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char *prefix, int verbose);
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static void bd_printbsdslice(struct open_disk *od, daddr_t offset,
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char *prefix, int verbose);
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static int bd_init(void);
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static int bd_strategy(void *devdata, int flag, daddr_t dblk,
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size_t size, char *buf, size_t *rsize);
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static int bd_realstrategy(void *devdata, int flag, daddr_t dblk,
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size_t size, char *buf, size_t *rsize);
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static int bd_open(struct open_file *f, ...);
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static int bd_close(struct open_file *f);
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static void bd_print(int verbose);
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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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bd_print,
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NULL
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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_open_pc98(struct open_disk *od, struct i386_devdesc *dev);
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static int bd_bestslice(struct open_disk *od);
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static void bd_checkextended(struct open_disk *od, int slicenum);
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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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static int
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bd_init(void)
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{
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int base, unit;
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int da_drive=0, n=-0x10;
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/* sequence 0x90, 0x80, 0xa0 */
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for (base = 0x90; base <= 0xa0; base += n, n += 0x30) {
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for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) {
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bdinfo[nbdinfo].bd_unit = unit;
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bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0;
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if (!bd_int13probe(&bdinfo[nbdinfo])){
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if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) ||
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((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6))
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continue; /* Target IDs are not contiguous. */
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else
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break;
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}
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if (bdinfo[nbdinfo].bd_flags & BD_FLOPPY){
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/* available 1.44MB access? */
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if (*(u_char *)PTOV(0xA15AE) & (1<<(unit & 0xf))) {
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/* boot media 1.2MB FD? */
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if ((*(u_char *)PTOV(0xA1584) & 0xf0) != 0x90)
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bdinfo[nbdinfo].bd_unit = 0x30 + (unit & 0xf);
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}
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}
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else {
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if ((unit & 0xF0) == 0xA0) /* SCSI HD or MO */
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bdinfo[nbdinfo].bd_da_unit = da_drive++;
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}
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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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'A' + nbdinfo, nbdinfo);
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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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int addr;
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if (bd->bd_flags & BD_FLOPPY) {
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addr = 0xa155c;
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} else {
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if ((bd->bd_unit & 0xf0) == 0x80)
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addr = 0xa155d;
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else
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addr = 0xa1482;
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}
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if ( *(u_char *)PTOV(addr) & (1<<(bd->bd_unit & 0x0f))) {
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bd->bd_flags |= BD_MODEINT13;
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return(1);
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}
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if ((bd->bd_unit & 0xF0) == 0xA0) {
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int media = ((unsigned *)PTOV(0xA1460))[bd->bd_unit & 0x0F] & 0x1F;
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if (media == 7) { /* MO */
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bd->bd_flags |= BD_MODEINT13 | BD_OPTICAL;
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return(1);
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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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* Print information about disks
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*/
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static void
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bd_print(int verbose)
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{
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int i, j;
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char line[80];
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struct i386_devdesc dev;
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struct open_disk *od;
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struct pc98_partition *dptr;
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for (i = 0; i < nbdinfo; i++) {
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sprintf(line, " disk%d: BIOS drive %c:\n", i, 'A' + i);
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pager_output(line);
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/* try to open the whole disk */
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dev.d_unit = i;
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dev.d_kind.biosdisk.slice = -1;
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dev.d_kind.biosdisk.partition = -1;
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if (!bd_opendisk(&od, &dev)) {
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/* Do we have a partition table? */
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if (od->od_flags & BD_PARTTABOK) {
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dptr = &od->od_slicetab[0];
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/* Check for a "dedicated" disk */
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for (j = 0; j < od->od_nslices; j++) {
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sprintf(line, " disk%ds%d", i, j + 1);
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bd_printslice(od, &dptr[j], line, verbose);
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}
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}
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bd_closedisk(od);
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}
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}
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}
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/* Given a size in 512 byte sectors, convert it to a human-readable number. */
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static char *
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display_size(uint64_t size)
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{
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static char buf[80];
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char unit;
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size /= 2;
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unit = 'K';
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if (size >= 10485760000LL) {
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size /= 1073741824;
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unit = 'T';
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} else if (size >= 10240000) {
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size /= 1048576;
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unit = 'G';
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} else if (size >= 10000) {
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size /= 1024;
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unit = 'M';
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}
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sprintf(buf, "%.6ld%cB", (long)size, unit);
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return (buf);
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}
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/*
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* Print information about slices on a disk. For the size calculations we
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* assume a 512 byte sector.
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*/
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static void
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bd_printslice(struct open_disk *od, struct pc98_partition *dp, char *prefix,
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int verbose)
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{
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int cylsecs, start, size;
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char stats[80];
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char line[80];
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cylsecs = od->od_hds * od->od_sec;
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start = dp->dp_scyl * cylsecs + dp->dp_shd * od->od_sec + dp->dp_ssect;
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size = (dp->dp_ecyl - dp->dp_scyl + 1) * cylsecs;
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if (verbose)
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sprintf(stats, " %s (%d - %d)", display_size(size),
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start, start + size);
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else
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stats[0] = '\0';
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switch(dp->dp_mid & PC98_MID_MASK) {
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case PC98_MID_386BSD:
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bd_printbsdslice(od, start, prefix, verbose);
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return;
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case 0x00: /* unused partition */
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return;
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case 0x01:
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sprintf(line, "%s: FAT-12%s\n", prefix, stats);
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break;
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case 0x11:
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case 0x20:
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case 0x21:
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case 0x22:
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case 0x23:
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case 0x24:
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sprintf(line, "%s: FAT-16%s\n", prefix, stats);
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break;
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default:
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sprintf(line, "%s: Unknown fs: 0x%x %s\n", prefix, dp->dp_mid,
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stats);
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}
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pager_output(line);
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}
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/*
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* Print out each valid partition in the disklabel of a FreeBSD slice.
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* For size calculations, we assume a 512 byte sector size.
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*/
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static void
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bd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix,
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int verbose)
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{
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char line[80];
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char buf[BIOSDISK_SECSIZE];
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struct disklabel *lp;
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int i;
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/* read disklabel */
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if (bd_read(od, offset + LABELSECTOR, 1, buf))
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return;
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lp =(struct disklabel *)(&buf[0]);
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if (lp->d_magic != DISKMAGIC) {
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sprintf(line, "%s: FFS bad disklabel\n", prefix);
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pager_output(line);
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return;
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}
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/* Print partitions */
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for (i = 0; i < lp->d_npartitions; i++) {
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/*
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* For each partition, make sure we know what type of fs it is. If
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* not, then skip it. However, since floppies often have bogus
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* fstypes, print the 'a' partition on a floppy even if it is marked
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* unused.
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*/
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if ((lp->d_partitions[i].p_fstype == FS_BSDFFS) ||
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(lp->d_partitions[i].p_fstype == FS_SWAP) ||
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(lp->d_partitions[i].p_fstype == FS_VINUM) ||
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((lp->d_partitions[i].p_fstype == FS_UNUSED) &&
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(od->od_flags & BD_FLOPPY) && (i == 0))) {
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/* Only print out statistics in verbose mode */
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if (verbose)
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sprintf(line, " %s%c: %s %s (%d - %d)\n", prefix, 'a' + i,
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(lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap " :
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(lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" :
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"FFS ",
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display_size(lp->d_partitions[i].p_size),
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lp->d_partitions[i].p_offset,
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lp->d_partitions[i].p_offset + lp->d_partitions[i].p_size);
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else
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sprintf(line, " %s%c: %s\n", prefix, 'a' + i,
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(lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap" :
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(lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" :
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"FFS");
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pager_output(line);
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}
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}
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}
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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, ...)
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{
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va_list ap;
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struct i386_devdesc *dev;
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struct open_disk *od;
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int error;
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va_start(ap, f);
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dev = va_arg(ap, struct i386_devdesc *);
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va_end(ap);
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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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|
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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 open_disk *od;
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int error;
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|
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if (dev->d_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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|
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/* Look up BIOS unit number, intialise open_disk structure */
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od->od_dkunit = dev->d_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 %d",
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i386_fmtdev(dev), dev->d_unit,
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dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition);
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|
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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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/* Determine disk layout. */
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error = bd_open_pc98(od, dev);
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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_open_pc98(struct open_disk *od, struct i386_devdesc *dev)
|
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{
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struct pc98_partition *dptr;
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struct disklabel *lp;
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int sector, slice, i;
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char buf[BUFSIZE];
|
|
|
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/*
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|
* Following calculations attempt to determine the correct value
|
|
* 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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* Find the slice in the DOS slice table.
|
|
*/
|
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od->od_nslices = 0;
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if (od->od_flags & BD_FLOPPY) {
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sector = 0;
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goto unsliced;
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}
|
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if (bd_read(od, 0, 1, buf)) {
|
|
DEBUG("error reading MBR");
|
|
return (EIO);
|
|
}
|
|
|
|
/*
|
|
* 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)");
|
|
return (ENOENT);
|
|
}
|
|
sector = 0;
|
|
goto unsliced; /* may be a floppy */
|
|
}
|
|
if (bd_read(od, 1, 1, buf)) {
|
|
DEBUG("error reading MBR");
|
|
return (EIO);
|
|
}
|
|
|
|
/*
|
|
* copy the partition table, then pick up any extended partitions.
|
|
*/
|
|
bcopy(buf + DOSPARTOFF, &od->od_slicetab,
|
|
sizeof(struct pc98_partition) * NDOSPART);
|
|
od->od_nslices = NDOSPART; /* extended slices start here */
|
|
od->od_flags |= BD_PARTTABOK;
|
|
dptr = &od->od_slicetab[0];
|
|
|
|
/* 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);
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
|
|
/* 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) {
|
|
return (ENOENT);
|
|
}
|
|
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_scyl * od->od_hds * od->od_sec +
|
|
dptr->dp_shd * od->od_sec + dptr->dp_ssect;
|
|
{
|
|
int end = dptr->dp_ecyl * od->od_hds * od->od_sec +
|
|
dptr->dp_ehd * od->od_sec + dptr->dp_esect;
|
|
DEBUG("slice entry %d at %d, %d sectors",
|
|
dev->d_kind.biosdisk.slice - 1, sector, end-sector);
|
|
}
|
|
|
|
/*
|
|
* If we are looking at a BSD slice, and the partition is < 0, assume the 'a' partition
|
|
*/
|
|
if ((dptr->dp_mid == DOSMID_386BSD) && (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 + LABELSECTOR, 1, buf)) {
|
|
DEBUG("error reading disklabel");
|
|
return (EIO);
|
|
}
|
|
DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
|
|
bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
|
|
lp = &od->od_disklabel;
|
|
od->od_flags |= BD_LABELOK;
|
|
|
|
if (lp->d_magic != DISKMAGIC) {
|
|
DEBUG("no disklabel");
|
|
return (ENOENT);
|
|
}
|
|
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);
|
|
return (EPART);
|
|
}
|
|
|
|
#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;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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 pc98_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_mid & PC98_MID_MASK) {
|
|
case PC98_MID_386BSD: /* FreeBSD */
|
|
if ((dp->dp_mid & PC98_MID_BOOTABLE) &&
|
|
(preflevel > PREF_FBSD_ACT)) {
|
|
pref = i;
|
|
preflevel = PREF_FBSD_ACT;
|
|
} else if (preflevel > PREF_FBSD) {
|
|
pref = i;
|
|
preflevel = PREF_FBSD;
|
|
}
|
|
break;
|
|
|
|
case 0x11: /* DOS/Windows */
|
|
case 0x20:
|
|
case 0x21:
|
|
case 0x22:
|
|
case 0x23:
|
|
case 0x63:
|
|
if ((dp->dp_mid & PC98_MID_BOOTABLE) &&
|
|
(preflevel > PREF_DOS_ACT)) {
|
|
pref = i;
|
|
preflevel = PREF_DOS_ACT;
|
|
} else if (preflevel > PREF_DOS) {
|
|
pref = i;
|
|
preflevel = PREF_DOS;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
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);
|
|
blks = size / BIOSDISK_SECSIZE;
|
|
if (rsize)
|
|
*rsize = 0;
|
|
|
|
switch(rw){
|
|
case F_READ:
|
|
DEBUG("read %d from %d to %p", blks, dblk, buf);
|
|
|
|
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
|
|
break;
|
|
case F_WRITE :
|
|
DEBUG("write %d from %d to %p", blks, dblk, buf);
|
|
|
|
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
|
|
break;
|
|
default:
|
|
/* DO NOTHING */
|
|
return (EROFS);
|
|
}
|
|
|
|
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_chs_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
|
|
{
|
|
u_int x, bpc, cyl, hd, sec;
|
|
|
|
bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */
|
|
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 */
|
|
|
|
v86.ctl = V86_FLAGS;
|
|
v86.addr = 0x1b;
|
|
if (write)
|
|
v86.eax = 0x0500 | od->od_unit;
|
|
else
|
|
v86.eax = 0x0600 | od->od_unit;
|
|
if (od->od_flags & BD_FLOPPY) {
|
|
v86.eax |= 0xd000;
|
|
v86.ecx = 0x0200 | (cyl & 0xff);
|
|
v86.edx = (hd << 8) | (sec + 1);
|
|
} else if (od->od_flags & BD_OPTICAL) {
|
|
v86.eax &= 0xFF7F;
|
|
v86.ecx = dblk & 0xFFFF;
|
|
v86.edx = dblk >> 16;
|
|
} else {
|
|
v86.ecx = cyl;
|
|
v86.edx = (hd << 8) | sec;
|
|
}
|
|
v86.ebx = blks * BIOSDISK_SECSIZE;
|
|
v86.es = VTOPSEG(dest);
|
|
v86.ebp = VTOPOFF(dest);
|
|
v86int();
|
|
return (v86.efl & 0x1);
|
|
}
|
|
|
|
static int
|
|
bd_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
|
|
{
|
|
u_int x, sec, result, resid, retry, maxfer;
|
|
caddr_t p, xp, bbuf, breg;
|
|
|
|
/* Just in case some idiot actually tries to read/write -1 blocks... */
|
|
if (blks < 0)
|
|
return (-1);
|
|
|
|
resid = blks;
|
|
p = dest;
|
|
|
|
/* Decide whether we have to bounce */
|
|
if (VTOP(dest) >> 20 != 0 ||
|
|
((VTOP(dest) >> 16) != (VTOP(dest + blks * BIOSDISK_SECSIZE) >> 16))) {
|
|
|
|
/*
|
|
* There is a 64k physical boundary somewhere in the
|
|
* destination buffer, or the destination buffer is above
|
|
* first 1MB of physical memory 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(od->od_sec, (unsigned)blks);
|
|
bbuf = alloca(x * 2 * BIOSDISK_SECSIZE);
|
|
if (((u_int32_t)VTOP(bbuf) & 0xffff0000) ==
|
|
((u_int32_t)VTOP(bbuf + x * BIOSDISK_SECSIZE) & 0xffff0000)) {
|
|
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) {
|
|
/*
|
|
* Play it safe and don't cross track boundaries.
|
|
* (XXX this is probably unnecessary)
|
|
*/
|
|
sec = dblk % od->od_sec; /* offset into track */
|
|
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;
|
|
|
|
/*
|
|
* Put your Data In, Put your Data out,
|
|
* Put your Data In, and shake it all about
|
|
*/
|
|
if (write && bbuf != NULL)
|
|
bcopy(p, breg, x * BIOSDISK_SECSIZE);
|
|
|
|
/*
|
|
* 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 = 0x1b;
|
|
v86.eax = 0x0300 | od->od_unit;
|
|
v86int();
|
|
}
|
|
|
|
result = bd_chs_io(od, dblk, x, xp, write);
|
|
if (result == 0)
|
|
break;
|
|
}
|
|
|
|
if (write)
|
|
DEBUG("%d sectors from %lld to %p (0x%x) %s", x, dblk, p, VTOP(p),
|
|
result ? "failed" : "ok");
|
|
else
|
|
DEBUG("%d sectors from %p (0x%x) to %lld %s", x, p, VTOP(p), dblk,
|
|
result ? "failed" : "ok");
|
|
if (result) {
|
|
return(-1);
|
|
}
|
|
if (!write && 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_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
|
|
{
|
|
|
|
return (bd_io(od, dblk, blks, dest, 0));
|
|
}
|
|
|
|
static int
|
|
bd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
|
|
{
|
|
|
|
return (bd_io(od, dblk, blks, dest, 1));
|
|
}
|
|
|
|
static int
|
|
bd_getgeom(struct open_disk *od)
|
|
{
|
|
|
|
if (od->od_flags & BD_FLOPPY) {
|
|
od->od_cyl = 79;
|
|
od->od_hds = 2;
|
|
od->od_sec = (od->od_unit & 0xf0) == 0x30 ? 18 : 15;
|
|
} else if (od->od_flags & BD_OPTICAL) {
|
|
od->od_cyl = 0xFFFE;
|
|
od->od_hds = 8;
|
|
od->od_sec = 32;
|
|
} else {
|
|
v86.ctl = V86_FLAGS;
|
|
v86.addr = 0x1b;
|
|
v86.eax = 0x8400 | od->od_unit;
|
|
v86int();
|
|
|
|
od->od_cyl = v86.ecx;
|
|
od->od_hds = (v86.edx >> 8) & 0xff;
|
|
od->od_sec = v86.edx & 0xff;
|
|
if (v86.efl & 0x1)
|
|
return(1);
|
|
}
|
|
|
|
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)
|
|
{
|
|
int hds = 0;
|
|
int unit = 0x80; /* IDE HDD */
|
|
u_int addr = 0xA155d;
|
|
|
|
while (unit < 0xa7) {
|
|
if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f)))
|
|
if (hds++ == bunit)
|
|
break;
|
|
|
|
if (unit >= 0xA0) {
|
|
int media = ((unsigned *)PTOV(0xA1460))[unit & 0x0F] & 0x1F;
|
|
|
|
if (media == 7 && hds++ == bunit) /* SCSI MO */
|
|
return(0xFFFE0820); /* C:65535 H:8 S:32 */
|
|
}
|
|
if (++unit == 0x84) {
|
|
unit = 0xA0; /* SCSI HDD */
|
|
addr = 0xA1482;
|
|
}
|
|
}
|
|
if (unit == 0xa7)
|
|
return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
|
|
v86.ctl = V86_FLAGS;
|
|
v86.addr = 0x1b;
|
|
v86.eax = 0x8400 | unit;
|
|
v86int();
|
|
if (v86.efl & 0x1)
|
|
return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
|
|
return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff);
|
|
}
|
|
|
|
/*
|
|
* Return a suitable dev_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_unit);
|
|
DEBUG("unit %d BIOS device %d", dev->d_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 & 0xf0) == 0x90 || (biosdev & 0xf0) == 0x30) {
|
|
/* floppy (or emulated floppy) or ATAPI device */
|
|
if (bdinfo[dev->d_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 */
|
|
if ((biosdev & 0xf0) == 0xa0)
|
|
unit = bdinfo[dev->d_unit].bd_da_unit;
|
|
else
|
|
unit = biosdev & 0xf;
|
|
|
|
/* 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);
|
|
}
|