193 lines
6.4 KiB
C
193 lines
6.4 KiB
C
/* $NetBSD: blkdev.c,v 1.1 2002/11/09 06:20:39 cgd Exp $ */
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/*
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* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)rz.c 8.1 (Berkeley) 6/10/93
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*/
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#include <sys/param.h>
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#include <sys/disklabel.h>
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#include "stand/common/cfe_api.h"
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#include "stand/common/common.h"
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#include "blkdev.h"
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/*
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* If BOOTXX_FS_TYPE is defined, we'll try to find and use the first
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* partition with that type mentioned in the disklabel, else default to
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* using block 0.
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*
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* The old boot blocks used to look for a file system starting at block
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* 0. It's not immediately obvious that change here is necessary or good,
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* so for now we don't bother looking for the specific type.
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*/
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#undef BOOTXX_FS_TYPE
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int blkdev_is_open;
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u_int32_t blkdev_part_offset;
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/*
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* Since we have only one device, and want to squeeze space, we just
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* short-circuit devopen() to do the disk open as well.
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*
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* Devopen is supposed to decode the string 'fname', open the device,
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* and make 'file' point to the remaining file name. Since we don't
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* do any device munging, we can just set *file to fname.
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*/
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int
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devopen(f, fname, file)
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struct open_file *f;
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const char *fname;
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char **file; /* out */
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{
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#if defined(BOOTXX_FS_TYPE)
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int i;
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size_t cnt;
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char *msg, buf[DEV_BSIZE];
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struct disklabel l;
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#endif /* defined(BOOTXX_FS_TYPE) */
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if (blkdev_is_open) {
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return (EBUSY);
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}
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*file = (char *)fname;
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#if 0
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f->f_devdata = NULL; /* no point */
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#endif
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/* Try to read disk label and partition table information. */
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blkdev_part_offset = 0;
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#if defined(BOOTXX_FS_TYPE)
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i = diskstrategy(NULL, F_READ,
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(daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
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if (i || cnt != DEV_BSIZE) {
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return (ENXIO);
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}
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msg = getdisklabel(buf, &l);
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if (msg == NULL) {
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/*
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* there's a label. find the first partition of the
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* type we want and use its offset. if none are
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* found, we just use offset 0.
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*/
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for (i = 0; i < l.d_npartitions; i++) {
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if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) {
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blkdev_part_offset = l.d_partitions[i].p_offset;
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break;
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}
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}
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} else {
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/* just use offset 0; it's already set that way */
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}
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#endif /* defined(BOOTXX_FS_TYPE) */
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blkdev_is_open = 1;
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return (0);
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}
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int
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blkdevstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt)
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void *devdata;
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int rw;
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daddr_t bn;
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size_t reqcnt;
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void *addrvoid;
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size_t *cnt; /* out: number of bytes transfered */
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{
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char *addr = addrvoid;
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int res;
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twiddle();
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/* Partial-block transfers not handled. */
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if (reqcnt & (DEV_BSIZE - 1)) {
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*cnt = 0;
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return (EINVAL);
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}
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res = cfe_readblk(booted_dev_fd,(bn+blkdev_part_offset)*DEV_BSIZE,addr,reqcnt);
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if (res < 0) return EIO;
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*cnt = res;
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return (0);
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}
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#if !defined(LIBSA_NO_FS_CLOSE)
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int
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blkdevclose(struct open_file *f)
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{
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blkdev_is_open = 0;
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return (0);
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}
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#endif /* !defined(LIBSA_NO_FS_CLOSE) */
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