107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* Copyright 2001,2005 by Kean Johnston <jkj@sco.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name Kean Johnston not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Kean Johnston makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*
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* KEAN JOHNSTON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEAN JOHNSTON BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "X.h"
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#include "compiler.h"
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#define _NEED_SYSI86
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86OSpriv.h"
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#include "xf86_OSlib.h"
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/***************************************************************************/
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/* I/O Permissions section */
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/***************************************************************************/
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static Bool IOEnabled = FALSE;
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_X_EXPORT Bool
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xf86EnableIO(void)
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{
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if (IOEnabled)
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return TRUE;
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if (sysi86(SI86IOPL, 3) < 0)
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FatalError("Failed to set IOPL for extended I/O\n");
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IOEnabled = TRUE;
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return TRUE;
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}
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_X_EXPORT void
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xf86DisableIO(void)
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{
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if (!IOEnabled)
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return;
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sysi86(SI86IOPL, 0);
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IOEnabled = FALSE;
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}
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/***************************************************************************/
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/* Interrupt Handling section */
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/***************************************************************************/
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_X_EXPORT Bool
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xf86DisableInterrupts(void)
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{
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if (!IOEnabled) {
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if (sysi86(SI86IOPL, 3) < 0)
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return FALSE;
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}
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#ifdef __GNUC__
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__asm__ __volatile__("cli");
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#else
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asm("cli");
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#endif /* __GNUC__ */
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if (!IOEnabled) {
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sysi86(SI86IOPL, 0);
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}
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return(TRUE);
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}
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_X_EXPORT void
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xf86EnableInterrupts(void)
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{
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if (!IOEnabled) {
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if (sysi86(SI86IOPL, 3) < 0)
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return;
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}
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#ifdef __GNUC__
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__asm__ __volatile__("sti");
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#else
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asm("sti");
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#endif /* __GNUC__ */
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if (!IOEnabled) {
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sysi86(SI86IOPL, 0);
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}
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}
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