114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
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/* $NetBSD: biosdisk_user.c,v 1.1 1998/05/15 17:07:15 drochner Exp $ */
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/*
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* Copyright (c) 1998
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* Matthias Drochner. 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 for the NetBSD Project
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* by Matthias Drochner.
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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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#include "sanamespace.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#include "biosdisk_user.h"
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/*
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* Replacement for i386/stand/lib/bios_disk.S.
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* Allows to map BIOS-like device numbers to character
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* device nodes or plain files.
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* The actual mapping is defined in the external table
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* "emuldisktab".
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*/
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static int currentdev, currentdte;
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static int fd = -1;
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int
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get_diskinfo(dev)
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int dev;
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{
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int i;
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if (fd != -1) {
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close(fd);
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fd = -1;
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}
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i = 0;
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for (;;) {
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if (emuldisktab[i].biosdev == -1)
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break;
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if (emuldisktab[i].biosdev == dev)
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goto ok;
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i++;
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}
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warnx("unknown device %x", dev);
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return (0);
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ok:
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fd = open(emuldisktab[i].name, O_RDONLY, 0);
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if (fd < 0) {
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warn("open %s", emuldisktab[i].name);
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return (0);
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}
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currentdev = dev;
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currentdte = i;
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return (((emuldisktab[i].heads - 1) << 8)
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+ emuldisktab[i].spt);
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}
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int
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biosread(dev, cyl, head, sec, nsec, buf)
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int dev;
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int cyl, head, sec;
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int nsec;
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char *buf;
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{
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if (dev != currentdev) {
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warnx("biosread: unexpected device %x", dev);
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return (-1);
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}
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if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head)
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* emuldisktab[currentdte].spt + sec) * 512,
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SEEK_SET) == -1) {
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warn("lseek");
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return (-1);
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}
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if (read(fd, buf, nsec * 512) != nsec * 512) {
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warn("read");
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return (-1);
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}
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return (0);
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}
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