139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* $NetBSD: diskio.c,v 1.1.1.1 1996/02/29 11:36:12 leo Exp $ */
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/*
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* Copyright (c) 1995 Waldi Ravens.
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* 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 Waldi Ravens.
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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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#include "stand.h"
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#include <sys/disklabel.h>
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typedef int (*rdsec_f)__P((void *buffer, u_int offset, u_int count));
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typedef struct { rdsec_f rds; u_int rst; u_int rend; } bdevd_t;
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static int rootstrategy __P((void *, int, daddr_t, size_t, void *, size_t *));
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static int rootopen __P((struct open_file *, ...));
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static int rootclose __P((struct open_file *));
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static int rootioctl __P((struct open_file *, u_long, void *));
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static struct devsw devsw[] = {
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{ "root", rootstrategy, rootopen, rootclose, rootioctl }
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};
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static bdevd_t bootdev;
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/*
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* Initialise boot device info.
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*/
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int
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init_dskio (func, label, root)
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void *func, *label;
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int root;
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{
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struct disklabel *dl = label;
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struct partition *pd = &dl->d_partitions[root];
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if (dl->d_magic != DISKMAGIC || dl->d_magic2 != DISKMAGIC
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|| dl->d_npartitions > MAXPARTITIONS || dkcksum(dl) != 0) {
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printf("Invalid disk label.\n");
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return(-1);
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}
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if (root >= 0) {
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if (root >= dl->d_npartitions
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|| pd->p_fstype != FS_BSDFFS || pd->p_size == 0) {
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printf("No suitable root.\n");
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return(-1);
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}
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bootdev.rds = func;
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bootdev.rst = pd->p_offset;
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bootdev.rend = pd->p_offset + pd->p_size - 1;
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}
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return(0);
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}
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/*
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* No choice, the kernel is loaded from the
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* same device as the bootstrap.
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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;
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{
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f->f_devdata = &bootdev;
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f->f_dev = &devsw[0];
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*file = (char *)fname;
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return(0);
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}
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static int
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rootstrategy (devd, flag, dblk, size, buf, rsize)
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void *devd;
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int flag;
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daddr_t dblk;
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size_t size;
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void *buf;
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size_t *rsize;
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{
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bdevd_t *dd = devd;
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daddr_t stb = dd->rst + dblk;
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size_t nb = size >> 9;
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if ((flag == F_READ) && !(size & 511) && (stb + nb <= dd->rend)) {
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if (!dd->rds(buf, stb, nb)) {
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*rsize = size;
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return(0);
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}
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}
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*rsize = 0;
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return(EIO);
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}
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static int
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rootopen (f)
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struct open_file *f;
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{
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return(0);
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}
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static int
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rootclose (f)
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struct open_file *f;
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{
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return(EIO);
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}
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static int
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rootioctl (f, cmd, data)
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struct open_file *f;
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u_long cmd;
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void *data;
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{
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return(EIO);
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}
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