136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/* $NetBSD: biosdisk_user.c,v 1.7 2008/12/14 18:46:33 christos 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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*
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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_ll.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(int dev)
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{
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int i, retval;
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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; /* triggers error in set_geometry() */
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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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retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16;
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retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6;
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retval |= emuldisktab[i].spt << 8;
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retval |= emuldisktab[i].heads - 1;
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return retval;
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}
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int
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biosread(int dev, int cyl, int head, int sec, int nsec, 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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int
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int13_extension(int dev)
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{
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return 0;
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}
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void
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int13_getextinfo(int dev, struct biosdisk_ext13info *info)
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{
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}
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struct ext {
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int8_t size;
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int8_t resvd;
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int16_t cnt;
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int16_t off;
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int16_t seg;
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int64_t sec;
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};
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int
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biosextread(int dev, struct ext *ext)
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{
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return -1;
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}
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