mirror of https://github.com/mpv-player/mpv
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
|
|
This file is based on:
|
|
$XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
|
|
Modified for readability by Nick Kurshev
|
|
*/
|
|
/*
|
|
* Copyright 1995 by Robin Cutshaw <robin@XFree86.Org>
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice appear in all copies and that both that
|
|
* copyright notice and this permission notice appear in supporting
|
|
* documentation, and that the names of the above listed copyright holder(s)
|
|
* not be used in advertising or publicity pertaining to distribution of
|
|
* the software without specific, written prior permission. The above listed
|
|
* copyright holder(s) make(s) no representations about the suitability of this
|
|
* software for any purpose. It is provided "as is" without express or
|
|
* implied warranty.
|
|
*
|
|
* THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM(S) ALL WARRANTIES WITH REGARD
|
|
* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
|
|
* LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
|
|
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
|
|
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
|
|
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#define INCL_DOSFILEMGR
|
|
#include <os2.h>
|
|
|
|
static USHORT callgate[3] = {0,0,0};
|
|
|
|
static __inline__ int enable_os_io(void)
|
|
{
|
|
HFILE hfd;
|
|
ULONG dlen,action;
|
|
APIRET rc;
|
|
static char *ioDrvPath = "/dev/fastio$";
|
|
|
|
if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
|
|
(ULONG)0, FILE_SYSTEM, FILE_OPEN,
|
|
OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
|
|
(ULONG)0) != 0) {
|
|
fprintf(stderr,"Error opening fastio$ driver...\n");
|
|
fprintf(stderr,"Please install xf86sup.sys in config.sys!\n");
|
|
return 42;
|
|
}
|
|
callgate[0] = callgate[1] = 0;
|
|
|
|
/* Get callgate from driver for fast io to ports and other stuff */
|
|
|
|
rc = DosDevIOCtl(hfd, (ULONG)0x76, (ULONG)0x64,
|
|
NULL, 0, NULL,
|
|
(ULONG*)&callgate[2], sizeof(USHORT), &dlen);
|
|
if (rc) {
|
|
fprintf(stderr,"xf86-OS/2: EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
|
|
rc,dlen);
|
|
DosClose(hfd);
|
|
return 42;
|
|
}
|
|
|
|
/* Calling callgate with function 13 sets IOPL for the program */
|
|
|
|
asm volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
|
|
: /*no outputs */
|
|
: /*no inputs */
|
|
: "eax","ebx","ecx","edx","cc");
|
|
|
|
DosClose(hfd);
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int disable_os_io(void)
|
|
{
|
|
/* Nothing to do */
|
|
return 0;
|
|
}
|