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/* $OpenBSD: diskio.c,v 1.11 2016/10/05 11:55:45 visa Exp $ */
/*
* Copyright (c) 2016 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) 2000 Opsycon AB (www.opsycon.se)
* Copyright (c) 2000 Rtmx, Inc (www.rtmx.com)
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for Rtmx, Inc by
* Opsycon Open System Consulting AB, Sweden.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <lib/libkern/libkern.h>
#include <stand.h>
#include <sys/disklabel.h>
#include <mips64/arcbios.h>
char *strstr(char *, const char *); /* strstr.c */
struct dio_softc {
int sc_fd; /* PROM file ID */
int sc_part; /* Disk partition number. */
struct disklabel sc_label; /* Disk label for this disk. */
};
int
diostrategy(void *devdata, int rw, daddr32_t bn, size_t reqcnt, void *addr,
size_t *cnt)
{
struct dio_softc *sc = (struct dio_softc *)devdata;
struct partition *pp = &sc->sc_label.d_partitions[sc->sc_part];
uint64_t blkoffset;
arc_quad_t offset;
long result;
blkoffset = (DL_GETPOFFSET(pp) + bn) * DEV_BSIZE;
offset.hi = blkoffset >> 32;
offset.lo = blkoffset;
if (Bios_Seek(sc->sc_fd, &offset, 0) < 0 ||
Bios_Read(sc->sc_fd, addr, reqcnt, &result) < 0)
return EIO;
*cnt = result;
return 0;
}
int
dioopen(struct open_file *f, ...)
{
char *ctlr;
int partition;
struct dio_softc *sc;
struct disklabel *lp;
struct sgilabel *sl;
long fd;
/* XXX getdisklabel() assumes DEV_BSIZE bytes available */
char buf[DEV_BSIZE + LABELOFFSET];
arc_quad_t offset;
daddr_t native_offset;
long result;
va_list ap;
char rawctlr[1 + MAXPATHLEN];
char *partptr;
va_start(ap, f);
ctlr = va_arg(ap, char *);
partition = va_arg(ap, int);
va_end(ap);
if (partition >= MAXPARTITIONS)
return ENXIO;
/*
* If booting from disk, `ctlr` is something like
* whatever()partition(0)
* or
* dksc(whatever,0)
* where 0 is the volume header #0 partition, which is the
* OpenBSD area, where the OpenBSD disklabel can be found.
*
* However, the OpenBSD `a' partition, where the kernel is to be
* found, may not start at the same offset.
*
* In order to be able to correctly load any file from the OpenBSD
* partitions, we need to access the volume header partition table
* and the OpenBSD label.
*
* Therefore, make sure we replace `partition(*)' with `partition(10)'
* before reaching ARCBios, in order to access the raw disk.
*
* We could use partition #8 and use the value of SystemPartition in
* the environment to avoid doing this, but this would prevent us
* from being able to boot from a different disk than the one
* pointed to by SystemPartition.
*/
strlcpy(rawctlr, ctlr, sizeof rawctlr);
partptr = strstr(rawctlr, "partition(");
if (partptr != NULL) {
strlcpy(partptr, "partition(10)",
sizeof rawctlr - (partptr - rawctlr));
} else {
if ((partptr = strstr(rawctlr, "dksc(")) != NULL) {
partptr = strstr(partptr, ",0)");
if (partptr != NULL && partptr[3] == '\0')
strlcpy(partptr, ",10)",
sizeof rawctlr - (partptr - rawctlr));
}
}
sl = NULL; /* no volume header found yet */
if (partptr != NULL) {
if (Bios_Open(rawctlr, 0, &fd) < 0)
return ENXIO;
/*
* Read the volume header.
*/
offset.hi = offset.lo = 0;
if (Bios_Seek(fd, &offset, 0) < 0 ||
Bios_Read(fd, buf, DEV_BSIZE, &result) < 0 ||
result != DEV_BSIZE)
return EIO;
sl = (struct sgilabel *)buf;
if (sl->magic != SGILABEL_MAGIC) {
#ifdef DEBUG
printf("Invalid volume header magic %x\n", sl->magic);
#endif
Bios_Close(fd);
sl = NULL;
}
}
if (sl == NULL) {
if (Bios_Open(ctlr, 0, &fd) < 0)
return ENXIO;
}
sc = alloc(sizeof(struct dio_softc));
bzero(sc, sizeof(struct dio_softc));
f->f_devdata = (void *)sc;
lp = &sc->sc_label;
sc->sc_fd = fd;
sc->sc_part = partition;
if (sl != NULL) {
native_offset = sl->partitions[0].first;
} else {
/*
* We could not read the volume header, or there isn't any.
* Stick to the device we were given, and assume the
* OpenBSD disklabel can be found at the beginning.
*/
native_offset = 0;
}
/*
* Read the native OpenBSD label.
*/
#ifdef DEBUG
printf("OpenBSD label @%lld\n", native_offset + LABELSECTOR);
#endif
offset.hi = ((native_offset + LABELSECTOR) * DEV_BSIZE) >> 32;
offset.lo = (native_offset + LABELSECTOR) * DEV_BSIZE;
if (Bios_Seek(fd, &offset, 0) < 0 ||
Bios_Read(fd, buf, DEV_BSIZE, &result) < 0 ||
result != DEV_BSIZE)
return EIO;
if (getdisklabel(buf + LABELOFFSET, lp) == NULL) {
#ifdef DEBUG
printf("Found native disklabel, "
"partition %c starts at %lld\n",
'a' + partition,
DL_GETPOFFSET(&lp->d_partitions[partition]));
#endif
} else {
/*
* Assume the OpenBSD partition spans the whole device.
*/
#ifdef DEBUG
printf("No native disklabel found\n");
#endif
lp->d_secsize = DEV_BSIZE;
lp->d_secpercyl = 1;
lp->d_npartitions = MAXPARTITIONS;
DL_SETPOFFSET(&lp->d_partitions[partition], native_offset);
DL_SETPSIZE(&lp->d_partitions[partition], -1ULL);
}
return 0;
}
int
dioclose(struct open_file *f)
{
Bios_Close(((struct dio_softc *)f->f_devdata)->sc_fd);
free(f->f_devdata, sizeof(struct dio_softc));
f->f_devdata = NULL;
return (0);
}
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