359 lines
8.2 KiB
C
359 lines
8.2 KiB
C
/*-
|
|
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
|
|
* Copyright (c) 2001 John H. Baldwin <jhb@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* BIOS CD device handling for CD's that have been booted off of via no
|
|
* emulation booting as defined in the El Torito standard.
|
|
*
|
|
* Ideas and algorithms from:
|
|
*
|
|
* - FreeBSD libi386/biosdisk.c
|
|
*
|
|
*/
|
|
|
|
#include <stand.h>
|
|
|
|
#include <sys/reboot.h>
|
|
#include <machine/param.h>
|
|
#include <machine/psl.h>
|
|
|
|
#include <stdarg.h>
|
|
|
|
#include <bootstrap.h>
|
|
#include <btxv86.h>
|
|
#include "libi386.h"
|
|
|
|
#define BIOSCD_SECSIZE 2048
|
|
#define BUFSIZE (1 * BIOSCD_SECSIZE)
|
|
#define MAXBCDEV 1
|
|
|
|
/* Major numbers for devices we frontend for. */
|
|
#define ACDMAJOR 117
|
|
#define CDMAJOR 15
|
|
|
|
#ifdef DISK_DEBUG
|
|
# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
|
|
#else
|
|
# define DEBUG(fmt, args...)
|
|
#endif
|
|
|
|
struct specification_packet {
|
|
u_char sp_size;
|
|
u_char sp_bootmedia;
|
|
u_char sp_drive;
|
|
u_char sp_controller;
|
|
u_int sp_lba;
|
|
u_short sp_devicespec;
|
|
u_short sp_buffersegment;
|
|
u_short sp_loadsegment;
|
|
u_short sp_sectorcount;
|
|
u_short sp_cylsec;
|
|
u_char sp_head;
|
|
};
|
|
|
|
/*
|
|
* List of BIOS devices, translation from disk unit number to
|
|
* BIOS unit number.
|
|
*/
|
|
static struct bcinfo {
|
|
int bc_unit; /* BIOS unit number */
|
|
struct specification_packet bc_sp;
|
|
} bcinfo [MAXBCDEV];
|
|
static int nbcinfo = 0;
|
|
|
|
static int bc_read(int unit, daddr_t dblk, int blks, caddr_t dest);
|
|
static int bc_init(void);
|
|
static int bc_strategy(void *devdata, int flag, daddr_t dblk,
|
|
size_t size, char *buf, size_t *rsize);
|
|
static int bc_realstrategy(void *devdata, int flag, daddr_t dblk,
|
|
size_t size, char *buf, size_t *rsize);
|
|
static int bc_open(struct open_file *f, ...);
|
|
static int bc_close(struct open_file *f);
|
|
static void bc_print(int verbose);
|
|
|
|
struct devsw bioscd = {
|
|
"cd",
|
|
DEVT_CD,
|
|
bc_init,
|
|
bc_strategy,
|
|
bc_open,
|
|
bc_close,
|
|
noioctl,
|
|
bc_print,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* Translate between BIOS device numbers and our private unit numbers.
|
|
*/
|
|
int
|
|
bc_bios2unit(int biosdev)
|
|
{
|
|
int i;
|
|
|
|
DEBUG("looking for bios device 0x%x", biosdev);
|
|
for (i = 0; i < nbcinfo; i++) {
|
|
DEBUG("bc unit %d is BIOS device 0x%x", i, bcinfo[i].bc_unit);
|
|
if (bcinfo[i].bc_unit == biosdev)
|
|
return(i);
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
int
|
|
bc_unit2bios(int unit)
|
|
{
|
|
if ((unit >= 0) && (unit < nbcinfo))
|
|
return(bcinfo[unit].bc_unit);
|
|
return(-1);
|
|
}
|
|
|
|
/*
|
|
* We can't quiz, we have to be told what device to use, so this functoin
|
|
* doesn't do anything. Instead, the loader calls bc_add() with the BIOS
|
|
* device number to add.
|
|
*/
|
|
static int
|
|
bc_init(void)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bc_add(int biosdev)
|
|
{
|
|
|
|
if (nbcinfo >= MAXBCDEV)
|
|
return (-1);
|
|
bcinfo[nbcinfo].bc_unit = biosdev;
|
|
v86.ctl = V86_FLAGS;
|
|
v86.addr = 0x13;
|
|
v86.eax = 0x4b01;
|
|
v86.edx = biosdev;
|
|
v86.ds = VTOPSEG(&bcinfo[nbcinfo].bc_sp);
|
|
v86.esi = VTOPOFF(&bcinfo[nbcinfo].bc_sp);
|
|
v86int();
|
|
if ((v86.eax & 0xff00) != 0)
|
|
return (-1);
|
|
|
|
printf("BIOS CD is cd%d\n", nbcinfo);
|
|
nbcinfo++;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Print information about disks
|
|
*/
|
|
static void
|
|
bc_print(int verbose)
|
|
{
|
|
int i;
|
|
char line[80];
|
|
|
|
for (i = 0; i < nbcinfo; i++) {
|
|
sprintf(line, " cd%d: Device 0x%x\n", i,
|
|
bcinfo[i].bc_sp.sp_devicespec);
|
|
pager_output(line);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attempt to open the disk described by (dev) for use by (f).
|
|
*/
|
|
static int
|
|
bc_open(struct open_file *f, ...)
|
|
{
|
|
va_list ap;
|
|
struct i386_devdesc *dev;
|
|
int error;
|
|
|
|
va_start(ap, f);
|
|
dev = va_arg(ap, struct i386_devdesc *);
|
|
va_end(ap);
|
|
if (dev->d_kind.bioscd.unit >= nbcinfo) {
|
|
DEBUG("attempt to open nonexistent disk");
|
|
return(ENXIO);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
bc_close(struct open_file *f)
|
|
{
|
|
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
bc_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf,
|
|
size_t *rsize)
|
|
{
|
|
struct i386_devdesc *dev;
|
|
int unit;
|
|
int blks;
|
|
#ifdef BD_SUPPORT_FRAGS
|
|
char fragbuf[BIOSCD_SECSIZE];
|
|
size_t fragsize;
|
|
|
|
fragsize = size % BIOSCD_SECSIZE;
|
|
#else
|
|
if (size % BIOSCD_SECSIZE)
|
|
return (EINVAL);
|
|
#endif
|
|
|
|
if (rw != F_READ)
|
|
return(EROFS);
|
|
dev = (struct i386_devdesc *)devdata;
|
|
unit = dev->d_kind.bioscd.unit;
|
|
blks = size / BIOSCD_SECSIZE;
|
|
if (dblk % (BIOSCD_SECSIZE / DEV_BSIZE) != 0)
|
|
return (EINVAL);
|
|
dblk /= (BIOSCD_SECSIZE / DEV_BSIZE);
|
|
DEBUG("read %d from %d to %p", blks, dblk, buf);
|
|
|
|
if (rsize)
|
|
*rsize = 0;
|
|
if (blks && bc_read(unit, dblk, blks, buf)) {
|
|
DEBUG("read error");
|
|
return (EIO);
|
|
}
|
|
#ifdef BD_SUPPORT_FRAGS
|
|
DEBUG("bc_strategy: frag read %d from %d+%d to %p",
|
|
fragsize, dblk, blks, buf + (blks * BIOSCD_SECSIZE));
|
|
if (fragsize && bc_read(unit, dblk + blks, 1, fragsize)) {
|
|
DEBUG("frag read error");
|
|
return(EIO);
|
|
}
|
|
bcopy(fragbuf, buf + (blks * BIOSCD_SECSIZE), fragsize);
|
|
#endif
|
|
if (rsize)
|
|
*rsize = size;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bc_read(int unit, daddr_t dblk, int blks, caddr_t dest)
|
|
{
|
|
u_int result, resid, retry;
|
|
static unsigned short packet[8];
|
|
int biosdev;
|
|
#ifdef DISK_DEBUG
|
|
int error;
|
|
#endif
|
|
|
|
/* Just in case some idiot actually tries to read -1 blocks... */
|
|
if (blks < 0)
|
|
return (-1);
|
|
|
|
/* If nothing to do, just return succcess. */
|
|
if (blks == 0)
|
|
return (0);
|
|
|
|
biosdev = bc_unit2bios(unit);
|
|
/*
|
|
* 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 = biosdev;
|
|
v86int();
|
|
}
|
|
|
|
packet[0] = 0x10;
|
|
packet[1] = blks;
|
|
packet[2] = VTOPOFF(dest);
|
|
packet[3] = VTOPSEG(dest);
|
|
packet[4] = dblk & 0xffff;
|
|
packet[5] = dblk >> 16;
|
|
packet[6] = 0;
|
|
packet[7] = 0;
|
|
v86.ctl = V86_FLAGS;
|
|
v86.addr = 0x13;
|
|
v86.eax = 0x4200;
|
|
v86.edx = biosdev;
|
|
v86.ds = VTOPSEG(packet);
|
|
v86.esi = VTOPOFF(packet);
|
|
v86int();
|
|
result = (v86.efl & PSL_C);
|
|
if (result == 0)
|
|
break;
|
|
}
|
|
|
|
#ifdef DISK_DEBUG
|
|
error = (v86.eax >> 8) & 0xff;
|
|
#endif
|
|
DEBUG("%d sectors from %ld to %p (0x%x) %s", blks, dblk, dest,
|
|
VTOP(dest), result ? "failed" : "ok");
|
|
DEBUG("unit %d status 0x%x", unit, error);
|
|
|
|
/* hexdump(dest, (blks * BIOSCD_SECSIZE)); */
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Return a suitable dev_t value for (dev).
|
|
*/
|
|
int
|
|
bc_getdev(struct i386_devdesc *dev)
|
|
{
|
|
int biosdev, unit;
|
|
int major;
|
|
int rootdev;
|
|
|
|
unit = dev->d_kind.bioscd.unit;
|
|
biosdev = bc_unit2bios(unit);
|
|
DEBUG("unit %d BIOS device %d", unit, biosdev);
|
|
if (biosdev == -1) /* not a BIOS device */
|
|
return(-1);
|
|
|
|
/*
|
|
* XXX: Need to examine device spec here to figure out if SCSI or
|
|
* ATAPI. No idea on how to figure out device number. All we can
|
|
* really pass to the kernel is what bus and device on which bus we
|
|
* were booted from, which dev_t isn't well suited to since those
|
|
* number don't match to unit numbers very well. We may just need
|
|
* to engage in a hack where we pass -C to the boot args if we are
|
|
* the boot device.
|
|
*/
|
|
major = ACDMAJOR;
|
|
unit = 0; /* XXX */
|
|
|
|
/* XXX: Assume partition 'a'. */
|
|
rootdev = MAKEBOOTDEV(major, 0, 0, unit, 0);
|
|
DEBUG("dev is 0x%x\n", rootdev);
|
|
return(rootdev);
|
|
}
|