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/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/os2/os2_ioperm.c,v 3.5 1997/08/26 10:01:38 hohndel Exp $ */
/*
* Copyright 1993 by David Wexelblat <dwex@goblin.org>
* Modified 1996 by Sebastien Marineau <marineau@genie.uottawa.ca>
*
* 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 name of David Wexelblat not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. David Wexelblat makes no representations
* about the suitability of this software for any purpose. It is provided
* "as is" without express or implied warranty.
*
* DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL DAVID WEXELBLAT 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.
*
*/
/* $XConsortium: os2_ioperm.c /main/4 1996/04/18 16:50:01 kaleb $ */
#define I_NEED_OS2_H
#define INCL_32
#define INCL_DOS
#define INCL_DOSFILEMGR
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
/*
* To access I/O ports under OS/2, we use the xf86sup.sys driver.
* For the moment, we use a function which basically grants IO priviledge
* to the whole server. NOTE: Once the server is running, we should
* change this to use inline IO functions through the callgate returned by
* the fastio$ driver.
*/
int ioEnabled=FALSE;
ULONG action;
char *ioDrvPath = "/dev/fastio$";
USHORT callgate[3]={0,0,0};
Bool xf86EnableIO()
{
HFILE hfd;
ULONG dlen;
APIRET rc;
/* no need to call multiple times */
if (ioEnabled) return TRUE;
if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
(ULONG)0, FILE_SYSTEM, FILE_OPEN,
OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
(ULONG)0) != 0) {
xf86Msg(X_ERROR,"Error opening fastio$ driver...\n");
xf86Msg(X_ERROR,"Please install xf86sup.sys in config.sys!\n");
return FALSE;
}
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) {
xf86Msg(X_ERROR,
"EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
rc,dlen);
DosClose(hfd);
return FALSE;
}
/* Calling callgate with function 13 sets IOPL for the program */
asm volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
: /*no outputs */
: /*no inputs */
: "eax","ebx","ecx","edx","cc");
ioEnabled = TRUE;
DosClose(hfd);
return TRUE;
}
void xf86DisableIO()
{
HFILE hfd;
ULONG dlen;
APIRET rc;
/* no need to call multiple times */
if (!ioEnabled) return;
if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
(ULONG)0, FILE_SYSTEM, FILE_OPEN,
OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
(ULONG)0) != 0) {
xf86Msg(X_ERROR,"Error opening fastio$ driver...\n");
xf86Msg(X_ERROR,"Please install xf86sup.sys in config.sys!\n");
return;
}
callgate[0] = callgate[1] = 0;
rc = DosDevIOCtl(hfd, (ULONG)0x76, (ULONG)0x64,
NULL, 0, NULL,
(ULONG*)&callgate[2], sizeof(USHORT), &dlen);
if (rc) {
xf86Msg(X_ERROR,"DisableIOPorts failed, rc=%d, dlen=%d\n",
rc,dlen);
DosClose(hfd);
return;
}
/* Function 14 of callgate brings program back to ring 3 */
asm volatile ("movl $14,%%ebx;.byte 0xff,0x1d;.long _callgate"
: /*no outputs */
: /*no inputs */
: "eax","ebx","ecx","edx","cc");
ioEnabled=FALSE;
DosClose(hfd);
return;
}
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