vidix/sysdep/pci_os2.c

   1 /*
   2    This file is based on:
   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
   5 */
   6 /*
   7  * Copyright 1995 by Robin Cutshaw <robin@XFree86.Org>
   8  *
   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
  18  * implied warranty.
  19  *
  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.
  27  */
  28
  29 #define INCL_DOSFILEMGR
  30 #include <os2.h>
  31
  32 static USHORT callgate[3] = {0,0,0};
  33
  34 static __inline__ int enable_os_io(void)
  35 {
  36         HFILE hfd;
  37         ULONG dlen,action;
  38         APIRET rc;
  39         static char *ioDrvPath = "/dev/fastio$";
  40
  41         if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
  42            (ULONG)0, FILE_SYSTEM, FILE_OPEN,
  43            OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
  44            (ULONG)0) != 0) {
  45                 fprintf(stderr,"Error opening fastio$ driver...\n");
  46                 fprintf(stderr,"Please install xf86sup.sys in config.sys!\n");
  47                 return 42;
  48         }
  49         callgate[0] = callgate[1] = 0;
  50
  51 /* Get callgate from driver for fast io to ports and other stuff */
  52
  53         rc = DosDevIOCtl(hfd, (ULONG)0x76, (ULONG)0x64,
  54                 NULL, 0, NULL,
  55                 (ULONG*)&callgate[2], sizeof(USHORT), &dlen);
  56         if (rc) {
  57                 fprintf(stderr,"xf86-OS/2: EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
  58                         rc,dlen);
  59                 DosClose(hfd);
  60                 return 42;
  61         }
  62
  63 /* Calling callgate with function 13 sets IOPL for the program */
  64
  65         __asm__ volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
  66                         : /*no outputs */
  67                         : /*no inputs */
  68                         : "eax","ebx","ecx","edx","cc");
  69
  70         DosClose(hfd);
  71         return 0;
  72 }
  73
  74 static __inline__ int disable_os_io(void)
  75 {
  76 /* Nothing to do */
  77         return 0;
  78 }