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https://github.com/mpv-player/mpv
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3404000366
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4175 b3059339-0415-0410-9bf9-f77b7e298cf2
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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This file is based on:
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$XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
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Modified for readability by Nick Kurshev
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*/
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#define INCL_DOSFILEMGR
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#include <os2.h>
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static USHORT callgate[3] = {0,0,0};
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static __inline__ int enable_os_io(void)
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{
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HFILE hfd;
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ULONG dlen,action;
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APIRET rc;
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static char *ioDrvPath = "/dev/fastio$";
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if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
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(ULONG)0, FILE_SYSTEM, FILE_OPEN,
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OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
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(ULONG)0) != 0) {
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fprintf(stderr,"Error opening fastio$ driver...\n");
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fprintf(stderr,"Please install xf86sup.sys in config.sys!\n");
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return(42);
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}
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callgate[0] = callgate[1] = 0;
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/* Get callgate from driver for fast io to ports and other stuff */
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rc = DosDevIOCtl(hfd, (ULONG)0x76, (ULONG)0x64,
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NULL, 0, NULL,
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(ULONG*)&callgate[2], sizeof(USHORT), &dlen);
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if (rc) {
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fprintf(stderr,"xf86-OS/2: EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
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rc,dlen);
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DosClose(hfd);
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return(42);
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}
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/* Calling callgate with function 13 sets IOPL for the program */
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asm volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
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: /*no outputs */
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: /*no inputs */
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: "eax","ebx","ecx","edx","cc");
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DosClose(hfd);
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return(0);
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}
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static __inline__ int disable_os_io(void)
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{
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/* Nothing to do */
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return(0);
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}
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