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/* $OpenBSD: dev.c,v 1.6 2014/07/12 18:44:42 tedu Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Manuel Bouyer.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/param.h>
#include "libsa.h"
#include <sys/disklabel.h>
#include <machine/cpu.h>
#include <machine/pmon.h>
/*
* PMON I/O
*/
char pmon_bootdev[1 + 256];
struct pmon_iodata {
int fd;
struct disklabel label;
off_t partoff;
off_t curpos;
};
int pmon_getdisklabel(struct pmon_iodata *pi);
int
pmon_iostrategy(void *f, int rw, daddr32_t dblk, size_t size, void *buf,
size_t *rsize)
{
struct pmon_iodata *pi = (struct pmon_iodata *)f;
off_t offs, pos;
int rc;
*rsize = 0;
if (size == 0)
return 0;
if (rw != F_READ)
return EOPNOTSUPP;
offs = ((daddr_t)dblk + pi->partoff) * DEV_BSIZE;
if (offs != pi->curpos) {
pos = pmon_lseek(pi->fd, offs, 0 /* SEEK_SET */);
if (pos != offs)
return EINVAL;
}
/* note this expects size to fit in 32 bits */
rc = pmon_read(pi->fd, buf, size);
if (rc >= 0) {
pi->curpos += rc;
*rsize = rc;
} else
*rsize = 0;
if (rc != size)
return EIO;
return 0;
}
int
pmon_ioopen(struct open_file *f, ...)
{
struct pmon_iodata *pi;
int rc;
va_list ap;
uint unit, part;
pi = alloc(sizeof *pi);
if (pi == NULL)
return ENOMEM;
bzero(pi, sizeof *pi);
f->f_devdata = pi;
va_start(ap, f);
unit = va_arg(ap, uint);
part = va_arg(ap, uint);
va_end(ap);
/*
* Open the raw device through PMON.
*/
snprintf(pmon_bootdev, sizeof pmon_bootdev, "/dev/disk/%s%d",
f->f_dev->dv_name, unit);
rc = pmon_open(pmon_bootdev, 0 /* O_RDONLY */);
if (rc < 0)
return ENXIO;
pi->fd = rc;
/*
* Read disklabel.
*/
if (pmon_getdisklabel(pi) != 0) {
pmon_ioclose(f);
return ENXIO;
}
if (part >= pi->label.d_npartitions) {
pmon_ioclose(f);
return EPART;
}
pi->partoff = DL_GETPOFFSET(&pi->label.d_partitions[part]);
pi->curpos = 0;
return 0;
}
int
pmon_ioclose(struct open_file *f)
{
struct pmon_iodata *pi;
int rc;
if (f->f_devdata != NULL) {
pi = (struct pmon_iodata *)f->f_devdata;
rc = pmon_close(pi->fd);
free(pi, sizeof *pi, 0);
f->f_devdata = NULL;
} else
rc = 0;
return rc;
}
/*
* Read disk label from the device.
*/
int
pmon_getdisklabel(struct pmon_iodata *pi)
{
char *msg;
int sector;
size_t rsize;
struct disklabel *lp = &pi->label;
char buf[DEV_BSIZE];
bzero(lp, sizeof *lp);
/*
* Find OpenBSD Partition in DOS partition table.
*/
sector = 0;
if (pmon_iostrategy(pi, F_READ, DOSBBSECTOR, DEV_BSIZE, buf, &rsize))
return ENXIO;
if (*(u_int16_t *)&buf[DOSMBR_SIGNATURE_OFF] == DOSMBR_SIGNATURE) {
int i;
struct dos_partition *dp = (struct dos_partition *)buf;
/*
* Lookup OpenBSD slice. If there is none, go ahead
* and try to read the disklabel off sector #0.
*/
memcpy(dp, &buf[DOSPARTOFF], NDOSPART * sizeof(*dp));
for (i = 0; i < NDOSPART; i++) {
if (dp[i].dp_typ == DOSPTYP_OPENBSD) {
sector = letoh32(dp[i].dp_start);
break;
}
}
}
if (pmon_iostrategy(pi, F_READ, sector + LABELSECTOR, DEV_BSIZE,
buf, &rsize))
return ENXIO;
if ((msg = getdisklabel(buf + LABELOFFSET, lp))) {
printf("getdisklabel: %s\n", msg);
return ENXIO;
}
return 0;
}
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