NetBSD-5.0.2/sys/arch/alpha/stand/common/blkdev.c
/* $NetBSD: blkdev.c,v 1.7 2005/12/24 22:45:34 perry Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 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.
*/
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)rz.c 8.1 (Berkeley) 6/10/93
*/
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include <sys/param.h>
#include <sys/disklabel.h>
#include <machine/prom.h>
#include "stand/common/common.h"
#include "blkdev.h"
#define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */
/*
* If BOOTXX_FS_TYPE is defined, we'll try to find and use the first
* partition with that type mentioned in the disklabel, else default to
* using block 0.
*
* The old boot blocks used to look for a file system starting at block
* 0. It's not immediately obvious that change here is necessary or good,
* so for now we don't bother looking for the specific type.
*
* However, for filesystem support on RAID1 sets we use a subset of the
* BOOTXX_FS_TYPE support.
*/
#if defined(BOOTXX_RAID1_SUPPORT)
#define BOOTXX_FS_TYPE
#else
#undef BOOTXX_FS_TYPE
#endif
int blkdev_is_open;
u_int32_t blkdev_part_offset;
/*
* Since we have only one device, and want to squeeze space, we just
* short-circuit devopen() to do the disk open as well.
*
* Devopen is supposed to decode the string 'fname', open the device,
* and make 'file' point to the remaining file name. Since we don't
* do any device munging, we can just set *file to fname.
*/
int
devopen(f, fname, file)
struct open_file *f;
const char *fname;
char **file; /* out */
{
#if defined(BOOTXX_FS_TYPE)
int i;
size_t cnt;
char *msg, buf[DEV_BSIZE];
struct disklabel l;
#endif /* defined(BOOTXX_FS_TYPE) */
if (blkdev_is_open)
return (EBUSY);
*file = (char *)fname;
#if 0
f->f_devdata = NULL; /* no point */
#endif
/* Try to read disk label and partition table information. */
blkdev_part_offset = 0;
#if defined(BOOTXX_FS_TYPE)
i = blkdevstrategy(NULL, F_READ,
(daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
if (i || cnt != DEV_BSIZE) {
return (ENXIO);
}
msg = getdisklabel(buf, &l);
if (msg == NULL) {
#if defined(BOOTXX_RAID1_SUPPORT)
if (l.d_partitions[0].p_fstype == FS_RAID) {
blkdev_part_offset = RF_PROTECTED_SECTORS;
}
#else
/*
* there's a label. find the first partition of the
* type we want and use its offset. if none are
* found, we just use offset 0.
*/
for (i = 0; i < l.d_npartitions; i++) {
if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) {
blkdev_part_offset = l.d_partitions[i].p_offset;
break;
}
}
#endif
} else {
/* just use offset 0; it's already set that way */
}
#endif /* defined(BOOTXX_FS_TYPE) */
blkdev_is_open = 1;
return (0);
}
int
blkdevstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt)
void *devdata;
int rw;
daddr_t bn;
size_t reqcnt;
void *addrvoid;
size_t *cnt; /* out: number of bytes transfered */
{
char *addr = addrvoid;
prom_return_t ret;
if ((reqcnt & 0xffffff) != reqcnt ||
reqcnt == 0)
__asm("call_pal 0");
twiddle();
/* Partial-block transfers not handled. */
if (reqcnt & (DEV_BSIZE - 1)) {
*cnt = 0;
return (EINVAL);
}
ret.bits = prom_read(booted_dev_fd, reqcnt, addr,
bn + blkdev_part_offset);
if (ret.u.status)
return (EIO);
*cnt = ret.u.retval;
return (0);
}
#if !defined(LIBSA_NO_FS_CLOSE)
int
blkdevclose(struct open_file *f)
{
blkdev_is_open = 0;
return (0);
}
#endif /* !defined(LIBSA_NO_FS_CLOSE) */