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biosdisk_user.c revision 1.4.44.1 
      1 /*	$NetBSD: biosdisk_user.c,v 1.4.44.1 2004/08/03 10:36:25 skrll Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998
      5  *	Matthias Drochner.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  *
     27  */
     28 
     29 #include "sanamespace.h"
     30 
     31 #include <stdio.h>
     32 #include <unistd.h>
     33 #include <fcntl.h>
     34 #include <err.h>
     35 
     36 #include "biosdisk_ll.h"
     37 #include "biosdisk_user.h"
     38 
     39 /*
     40  * Replacement for i386/stand/lib/bios_disk.S.
     41  * Allows to map BIOS-like device numbers to character
     42  * device nodes or plain files.
     43  * The actual mapping is defined in the external table
     44  * "emuldisktab".
     45  */
     46 
     47 static int currentdev, currentdte;
     48 static int fd = -1;
     49 
     50 int
     51 get_diskinfo(dev)
     52 	int dev;
     53 {
     54 	int i, retval;
     55 
     56 	if (fd != -1) {
     57 		close(fd);
     58 		fd = -1;
     59 	}
     60 
     61 	i = 0;
     62 	for (;;) {
     63 		if (emuldisktab[i].biosdev == -1)
     64 			break;
     65 		if (emuldisktab[i].biosdev == dev)
     66 			goto ok;
     67 		i++;
     68 	}
     69 	warnx("unknown device %x", dev);
     70 	return (0); /* triggers error in set_geometry() */
     71 
     72 ok:
     73 	fd = open(emuldisktab[i].name, O_RDONLY, 0);
     74 	if (fd < 0) {
     75 		warn("open %s", emuldisktab[i].name);
     76 		return (0);
     77 	}
     78 
     79 	currentdev = dev;
     80 	currentdte = i;
     81 
     82 	retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16;
     83 	retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6;
     84 	retval |= emuldisktab[i].spt << 8;
     85 	retval |= emuldisktab[i].heads - 1;
     86 	return (retval);
     87 }
     88 
     89 int
     90 biosread(dev, cyl, head, sec, nsec, buf)
     91 	int dev;
     92 	int cyl, head, sec;
     93 	int nsec;
     94 	char *buf;
     95 {
     96 	if (dev != currentdev) {
     97 		warnx("biosread: unexpected device %x", dev);
     98 		return (-1);
     99 	}
    100 
    101 	if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head)
    102 		       * emuldisktab[currentdte].spt + sec) * 512,
    103 		  SEEK_SET) == -1) {
    104 		warn("lseek");
    105 		return (-1);
    106 	}
    107 	if (read(fd, buf, nsec * 512) != nsec * 512) {
    108 		warn("read");
    109 		return (-1);
    110 	}
    111 	return (0);
    112 }
    113 
    114 int
    115 int13_extension(dev)
    116 	int dev;
    117 {
    118 	return (0);
    119 }
    120 
    121 void
    122 int13_getextinfo(dev, info)
    123 	int dev;
    124 	struct biosdisk_ext13info *info;
    125 {
    126 }
    127 
    128 struct ext {
    129 	int8_t	size;
    130 	int8_t	resvd;
    131 	int16_t	cnt;
    132 	int16_t	off;
    133 	int16_t	seg;
    134 	int64_t	sec;
    135 };
    136 
    137 int
    138 biosextread(dev, ext)
    139 	int dev;
    140 	struct ext *ext;
    141 {
    142 	return (-1);
    143 }
    144