xref: /minix3/sys/arch/i386/stand/lib/diskbuf.h (revision 58a2b0008e28f606a7f7f5faaeaba4faac57a1ea)
1*58a2b000SEvgeniy Ivanov /*	$NetBSD: diskbuf.h,v 1.4 2005/12/11 12:17:48 christos Exp $	*/
2*58a2b000SEvgeniy Ivanov 
3*58a2b000SEvgeniy Ivanov /*
4*58a2b000SEvgeniy Ivanov  * Copyright (c) 1996
5*58a2b000SEvgeniy Ivanov  *	Matthias Drochner.  All rights reserved.
6*58a2b000SEvgeniy Ivanov  *
7*58a2b000SEvgeniy Ivanov  * Redistribution and use in source and binary forms, with or without
8*58a2b000SEvgeniy Ivanov  * modification, are permitted provided that the following conditions
9*58a2b000SEvgeniy Ivanov  * are met:
10*58a2b000SEvgeniy Ivanov  * 1. Redistributions of source code must retain the above copyright
11*58a2b000SEvgeniy Ivanov  *    notice, this list of conditions and the following disclaimer.
12*58a2b000SEvgeniy Ivanov  * 2. Redistributions in binary form must reproduce the above copyright
13*58a2b000SEvgeniy Ivanov  *    notice, this list of conditions and the following disclaimer in the
14*58a2b000SEvgeniy Ivanov  *    documentation and/or other materials provided with the distribution.
15*58a2b000SEvgeniy Ivanov  *
16*58a2b000SEvgeniy Ivanov  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17*58a2b000SEvgeniy Ivanov  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18*58a2b000SEvgeniy Ivanov  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19*58a2b000SEvgeniy Ivanov  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20*58a2b000SEvgeniy Ivanov  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21*58a2b000SEvgeniy Ivanov  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22*58a2b000SEvgeniy Ivanov  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23*58a2b000SEvgeniy Ivanov  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24*58a2b000SEvgeniy Ivanov  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25*58a2b000SEvgeniy Ivanov  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*58a2b000SEvgeniy Ivanov  *
27*58a2b000SEvgeniy Ivanov  */
28*58a2b000SEvgeniy Ivanov 
29*58a2b000SEvgeniy Ivanov /* data buffer for BIOS disk / DOS I/O */
30*58a2b000SEvgeniy Ivanov 
31*58a2b000SEvgeniy Ivanov #ifndef DISKBUFSIZE
32*58a2b000SEvgeniy Ivanov /* Read ahead buffer large enough for one track on a 1440K floppy.
33*58a2b000SEvgeniy Ivanov  */
34*58a2b000SEvgeniy Ivanov #define DISKBUFSIZE (18*512)
35*58a2b000SEvgeniy Ivanov #endif
36*58a2b000SEvgeniy Ivanov 
37*58a2b000SEvgeniy Ivanov extern char *diskbufp;		/* allocated from heap... */
38*58a2b000SEvgeniy Ivanov extern const void *diskbuf_user; /* using function sets it to unique
39*58a2b000SEvgeniy Ivanov 			    value to allow check if overwritten*/
40*58a2b000SEvgeniy Ivanov char *alloc_diskbuf(const void *);
41