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      1 /*	$NetBSD: biosdisk_user.c,v 1.7 2008/12/14 18:46:33 christos 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(int dev)
     52 {
     53 	int i, retval;
     54 
     55 	if (fd != -1) {
     56 		close(fd);
     57 		fd = -1;
     58 	}
     59 
     60 	i = 0;
     61 	for (;;) {
     62 		if (emuldisktab[i].biosdev == -1)
     63 			break;
     64 		if (emuldisktab[i].biosdev == dev)
     65 			goto ok;
     66 		i++;
     67 	}
     68 	warnx("unknown device %x", dev);
     69 	return 0; /* triggers error in set_geometry() */
     70 
     71 ok:
     72 	fd = open(emuldisktab[i].name, O_RDONLY, 0);
     73 	if (fd < 0) {
     74 		warn("open %s", emuldisktab[i].name);
     75 		return 0;
     76 	}
     77 
     78 	currentdev = dev;
     79 	currentdte = i;
     80 
     81 	retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16;
     82 	retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6;
     83 	retval |= emuldisktab[i].spt << 8;
     84 	retval |= emuldisktab[i].heads - 1;
     85 	return retval;
     86 }
     87 
     88 int
     89 biosread(int dev, int cyl, int head, int sec, int nsec, char *buf)
     90 {
     91 
     92 	if (dev != currentdev) {
     93 		warnx("biosread: unexpected device %x", dev);
     94 		return -1;
     95 	}
     96 
     97 	if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head)
     98 		       * emuldisktab[currentdte].spt + sec) * 512,
     99 		  SEEK_SET) == -1) {
    100 		warn("lseek");
    101 		return -1;
    102 	}
    103 	if (read(fd, buf, nsec * 512) != nsec * 512) {
    104 		warn("read");
    105 		return -1;
    106 	}
    107 	return 0;
    108 }
    109 
    110 int
    111 int13_extension(int dev)
    112 {
    113 
    114 	return 0;
    115 }
    116 
    117 void
    118 int13_getextinfo(int dev, struct biosdisk_ext13info *info)
    119 {
    120 }
    121 
    122 struct ext {
    123 	int8_t	size;
    124 	int8_t	resvd;
    125 	int16_t	cnt;
    126 	int16_t	off;
    127 	int16_t	seg;
    128 	int64_t	sec;
    129 };
    130 
    131 int
    132 biosextread(int dev, struct ext *ext)
    133 {
    134 	return -1;
    135 }
    136