mirror of https://github.com/mpv-player/mpv
56 lines
1.4 KiB
C
56 lines
1.4 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
|
|
*/
|
|
#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);
|
|
}
|