/* 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 * * 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. */ #include #include #include "vidix/dhahelperwin/dhahelper.h" static HANDLE hDriver; int IsWinNT(void); static __inline__ int enable_os_io(void) { if(IsWinNT()){ DWORD dwBytesReturned; hDriver = CreateFile("\\\\.\\DHAHELPER",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL); if(!DeviceIoControl(hDriver, IOCTL_DHAHELPER_ENABLEDIRECTIO, NULL,0, NULL, 0, &dwBytesReturned, NULL)){ fprintf(stderr,"Unable to enable directio please install dhahelper.sys.\n"); return 1; } } return 0; } static __inline__ int disable_os_io(void) { if(IsWinNT()){ DWORD dwBytesReturned; DeviceIoControl(hDriver, IOCTL_DHAHELPER_DISABLEDIRECTIO, NULL,0, NULL, 0, &dwBytesReturned, NULL); CloseHandle(hDriver); } return 0; }