3 $XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
4 Modified for readability by Nick Kurshev
7 * Copyright 1995 by Robin Cutshaw <robin@XFree86.Org>
9 * Permission to use, copy, modify, distribute, and sell this software and its
10 * documentation for any purpose is hereby granted without fee, provided that
11 * the above copyright notice appear in all copies and that both that
12 * copyright notice and this permission notice appear in supporting
13 * documentation, and that the names of the above listed copyright holder(s)
14 * not be used in advertising or publicity pertaining to distribution of
15 * the software without specific, written prior permission. The above listed
16 * copyright holder(s) make(s) no representations about the suitability of this
17 * software for any purpose. It is provided "as is" without express or
20 * THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM(S) ALL WARRANTIES WITH REGARD
21 * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
22 * AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
23 * LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
24 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
25 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
26 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29 #define INCL_DOSFILEMGR
32 static USHORT callgate
[3] = {0,0,0};
34 static __inline__
int enable_os_io(void)
39 static char *ioDrvPath
= "/dev/fastio$";
41 if (DosOpen((PSZ
)ioDrvPath
, (PHFILE
)&hfd
, (PULONG
)&action
,
42 (ULONG
)0, FILE_SYSTEM
, FILE_OPEN
,
43 OPEN_SHARE_DENYNONE
|OPEN_FLAGS_NOINHERIT
|OPEN_ACCESS_READONLY
,
45 fprintf(stderr
,"Error opening fastio$ driver...\n");
46 fprintf(stderr
,"Please install xf86sup.sys in config.sys!\n");
49 callgate
[0] = callgate
[1] = 0;
51 /* Get callgate from driver for fast io to ports and other stuff */
53 rc
= DosDevIOCtl(hfd
, (ULONG
)0x76, (ULONG
)0x64,
55 (ULONG
*)&callgate
[2], sizeof(USHORT
), &dlen
);
57 fprintf(stderr
,"xf86-OS/2: EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
63 /* Calling callgate with function 13 sets IOPL for the program */
65 __asm__
volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
68 : "eax","ebx","ecx","edx","cc");
74 static __inline__
int disable_os_io(void)