FreeBSD-5.3/sys/boot/arc/lib/arcdisk.c
/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* Copyright (c) 1998 Doug Rabson <dfr@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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/boot/arc/lib/arcdisk.c,v 1.7 2004/01/04 23:28:01 obrien Exp $");
/*
* ARC disk device handling.
*
* Ideas and algorithms from:
*
* - NetBSD libi386/biosdisk.c
* - FreeBSD biosboot/disk.c
*/
#include <stand.h>
#include <machine/stdarg.h>
#include "bootstrap.h"
#include "libarc.h"
#include "arctypes.h"
#include "arcfuncs.h"
#define ARCDISK_SECSIZE 512
#define BUFSIZE (1 * ARCDISK_SECSIZE)
#define MAXBDDEV MAXDEV
#ifdef DISK_DEBUG
# define D(x) x
#else
# define D(x)
#endif
static int bd_init(void);
static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf, size_t *rsize);
static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf, size_t *rsize);
static int bd_open(struct open_file *f, ...);
static int bd_close(struct open_file *f);
static void bd_print(int verbose);
struct open_disk {
int od_fd;
int od_unit; /* our unit number */
int od_boff; /* block offset from beginning of ARC disk */
int od_flags;
#define BD_FLOPPY (1<<2)
u_char od_buf[BUFSIZE]; /* transfer buffer (do we want/need this?) */
};
struct devsw arcdisk = {
"disk",
DEVT_DISK,
bd_init,
bd_strategy,
bd_open,
bd_close,
noioctl,
bd_print
};
/*
* List of ARC devices, translation from disk unit number to
* ARC unit number.
*/
static struct
{
char bd_name[64];
int bd_unit; /* ARC unit number */
int bd_namelen;
int bd_flags;
} bdinfo [MAXBDDEV];
static int nbdinfo = 0;
/*
* Quiz ARC for disk devices, save a little info about them.
*/
static int
bd_init(void)
{
nbdinfo++;
return (0);
}
/*
* Print information about disks
*/
static void
bd_print(int verbose)
{
int i;
char line[80];
for (i = 0; i < nbdinfo; i++) {
sprintf(line, " disk%d: ARC drive %s", i, bdinfo[i].bd_name);
pager_output(line);
/* XXX more detail? */
pager_output("\n");
}
}
/*
* Attempt to open the disk described by (dev) for use by (f).
*
* Note that the philosophy here is "give them exactly what
* they ask for". This is necessary because being too "smart"
* about what the user might want leads to complications.
* (eg. given no slice or partition value, with a disk that is
* sliced - are they after the first BSD slice, or the DOS
* slice before it?)
*/
static int
bd_open(struct open_file *f, ...)
{
struct arc_devdesc *dev;
struct dos_partition *dptr;
struct open_disk *od;
struct disklabel *lp;
int sector, slice, i;
int error;
int unit;
u_int32_t fd;
va_list ap;
va_start(ap, f);
dev = va_arg(ap, struct arc_devdesc *);
va_end(ap);
unit = dev->d_kind.arcdisk.unit;
if (unit >= nbdinfo) {
D(printf("attempt to open nonexistent disk\n"));
return(ENXIO);
}
if (Open("scsi(0)disk(0)rdisk(0)partition(0)",
OpenReadOnly, &fd) != ESUCCESS)
if (Open("scsi(0)disk(1)rdisk(0)partition(0)",
OpenReadOnly, &fd) != ESUCCESS)
if (Open("multi(0)disk(0)fdisk(0)partition(0)",
OpenReadOnly, &fd) != ESUCCESS)
return(ENXIO);
od = (struct open_disk *) malloc(sizeof(struct open_disk));
if (!od) {
D(printf("arcdiskopen: no memory\n"));
return (ENOMEM);
}
/* Look up ARC unit number, intialise open_disk structure */
od->od_fd = fd;
od->od_unit = dev->d_kind.arcdisk.unit;
od->od_flags = bdinfo[od->od_unit].bd_flags;
od->od_boff = 0;
error = 0;
#if 0
/* Get geometry for this open (removable device may have changed) */
if (set_geometry(&od->od_ll)) {
D(printf("bd_open: can't get geometry\n"));
error = ENXIO;
goto out;
}
#endif
/*
* Following calculations attempt to determine the correct value
* for d->od_boff by looking for the slice and partition specified,
* or searching for reasonable defaults.
*/
#if 0
/*
* Find the slice in the DOS slice table.
*/
if (readsects(&od->od_ll, 0, 1, od->od_buf, 0)) {
D(printf("bd_open: error reading MBR\n"));
error = EIO;
goto out;
}
/*
* Check the slice table magic.
*/
if ((od->od_buf[0x1fe] != 0xff) || (od->od_buf[0x1ff] != 0xaa)) {
/* If a slice number was explicitly supplied, this is an error */
if (dev->d_kind.arcdisk.slice > 0) {
D(printf("bd_open: no slice table/MBR (no magic)\n"));
error = ENOENT;
goto out;
}
sector = 0;
goto unsliced; /* may be a floppy */
}
dptr = (struct dos_partition *) & od->od_buf[DOSPARTOFF];
/*
* XXX No support here for 'extended' slices
*/
if (dev->d_kind.arcdisk.slice <= 0) {
/*
* Search for the first FreeBSD slice; this also works on "unsliced"
* disks, as they contain a "historically bogus" MBR.
*/
for (i = 0; i < NDOSPART; i++, dptr++)
if (dptr->dp_typ == DOSPTYP_386BSD) {
sector = dptr->dp_start;
break;
}
/* Did we find something? */
if (sector == -1) {
error = ENOENT;
goto out;
}
} else {
/*
* Accept the supplied slice number unequivocally (we may be looking
* for a DOS partition) if we can handle it.
*/
if ((dev->d_kind.arcdisk.slice > NDOSPART) || (dev->d_kind.arcdisk.slice < 1)) {
error = ENOENT;
goto out;
}
dptr += (dev->d_kind.arcdisk.slice - 1);
sector = dptr->dp_start;
}
unsliced:
#else
sector = 0;
#endif
/*
* Now we have the slice, look for the partition in the disklabel if we have
* a partition to start with.
*/
if (dev->d_kind.arcdisk.partition < 0) {
od->od_boff = sector; /* no partition, must be after the slice */
} else {
if (bd_strategy(od, F_READ, sector + LABELSECTOR, 512, od->od_buf, 0)) {
D(printf("bd_open: error reading disklabel\n"));
error = EIO;
goto out;
}
lp = (struct disklabel *) (od->od_buf + LABELOFFSET);
if (lp->d_magic != DISKMAGIC) {
D(printf("bd_open: no disklabel\n"));
error = ENOENT;
goto out;
} else if (dev->d_kind.arcdisk.partition >= lp->d_npartitions) {
/*
* The partition supplied is out of bounds; this is fatal.
*/
D(printf("partition '%c' exceeds partitions in table (a-'%c')\n",
'a' + dev->d_kind.arcdisk.partition, 'a' + lp->d_npartitions));
error = EPART;
goto out;
} else {
/*
* Complain if the partition type is wrong and it shouldn't be, but
* regardless accept this partition.
*/
D(if ((lp->d_partitions[dev->d_kind.arcdisk.partition].p_fstype == FS_UNUSED) &&
!(od->od_flags & BD_FLOPPY)) /* Floppies often have bogus fstype */
printf("bd_open: warning, partition marked as unused\n"););
od->od_boff = lp->d_partitions[dev->d_kind.arcdisk.partition].p_offset;
}
}
/*
* Save our context
*/
f->f_devdata = od;
out:
if (error)
free(od);
return(error);
}
static int
bd_close(struct open_file *f)
{
struct open_disk *od = f->f_devdata;
Close(od->od_fd);
free(od);
f->f_devdata = NULL;
return(0);
}
static int
bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
{
struct bcache_devdata bcd;
struct arc_devdesc *dev = (struct arc_devdesc *)devdata;
bcd.dv_strategy = bd_realstrategy;
bcd.dv_devdata = devdata;
return(bcache_strategy(&bcd, dev->d_kind.arcdisk.unit, rw, dblk, size,
buf, rsize));
}
static int
bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf, size_t *rsize)
{
struct open_disk *od = (struct open_disk *)devdata;
fpos_t seek;
u_int32_t count;
if (size % ARCDISK_SECSIZE)
panic("bd_strategy: I/O not block multiple");
if (flag != F_READ)
return(EROFS);
if (rsize)
*rsize = 0;
seek = 512 * (dblk + od->od_boff);
Seek(od->od_fd, &seek, SeekAbsolute);
if (Read(od->od_fd, buf, size, &count) != ESUCCESS) {
D(printf("read error\n"));
return (EIO);
}
if (rsize)
*rsize = count;
return (0);
}