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151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/* $NetBSD: devopen.c,v 1.1 2006/09/01 21:26:18 uwe Exp $ */
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/*-
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* Copyright (c) 1993 John Brezak
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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. 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
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 "biosdisk.h"
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#include "boot.h"
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#include "bootinfo.h"
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static int dev2bios(char *devname, unsigned int unit, int *biosdev);
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static int devlookup(char *d);
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static int
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dev2bios(char *devname, unsigned int unit, int *biosdev)
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{
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if (strcmp(devname, "hd") == 0) {
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if (unit == 0 || unit == 1) {
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*biosdev = 0x40 + (unit << 4);
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return (0);
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}
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}
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return (ENXIO);
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}
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int
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bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
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{
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*devname = "hd";
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*unit = (biosdev >> 4) & 1;
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*ptnp = biosdisk_findptn(biosdev, sector);
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return (0);
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}
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static int
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devlookup(char *d)
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{
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struct devsw *dp = devsw;
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int i;
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for (i = 0; i < ndevs; i++, dp++) {
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if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
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return (i);
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}
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}
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printf("No such device - Configured devices are:\n");
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for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
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if (dp->dv_name != NULL) {
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printf(" %s", dp->dv_name);
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}
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}
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printf("\n");
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return (-1);
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}
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int
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devopen(struct open_file *f, const char *fname, char **file)
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{
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static struct btinfo_bootpath bibp;
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struct devsw *dp;
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char *devname;
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unsigned int dev, ctlr, unit, partition;
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int biosdev;
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int error;
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#if defined(DEBUG)
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printf("devopen: fname = %s\n", fname);
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#endif
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ctlr = 0;
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if ((error = parsebootfile(fname, &devname, &unit, &partition,
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(const char **)file)) != 0) {
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return (error);
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}
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#if defined(DEBUG)
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printf("devopen: devname = %s\n", devname);
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#endif
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dev = devlookup(devname);
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if (dev == -1) {
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#if defined(DEBUG)
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printf("devopen: devlookup failed\n");
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#endif
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return (ENXIO);
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}
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dp = &devsw[dev];
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if (dp->dv_open == NULL) {
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#if defined(DEBUG)
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printf("devopen: dev->dv_open() == NULL\n");
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#endif
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return (ENODEV);
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}
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f->f_dev = dp;
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strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
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BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
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if (dev2bios(devname, unit, &biosdev) == 0) {
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#if defined(DEBUG)
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printf("devopen: bios disk\n");
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#endif
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return (biosdisk_open(f, biosdev, partition));
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}
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#if defined(DEBUG)
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printf("devopen: dev->dv_open()\n");
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#endif
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if ((error = (*dp->dv_open)(f, ctlr, unit, partition)) == 0) {
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#if defined(DEBUG)
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printf("devopen: dev->dv_open() opened\n");
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#endif
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return (0);
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}
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printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
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strerror(error));
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return (error);
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}
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