144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* Copyright (c) 1993-2003 by The XFree86 Project, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of the copyright holder(s)
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* and author(s) shall not be used in advertising or otherwise to promote
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* the sale, use or other dealings in this Software without prior written
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* authorization from the copyright holder(s) and author(s).
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <X11/X.h>
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#include "input.h"
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#include "scrnintstr.h"
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#include "xf86OSpriv.h"
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/*
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* This file contains the common part of the video memory mapping functions
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*/
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/*
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* Get a piece of the ScrnInfoRec. At the moment, this is only used to hold
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* the MTRR option information, but it is likely to be expanded if we do
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* auto unmapping of memory at VT switch.
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*
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*/
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typedef struct {
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Bool mtrrEnabled;
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MessageType mtrrFrom;
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Bool mtrrOptChecked;
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ScrnInfoPtr pScrn;
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} VidMapRec, *VidMapPtr;
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static int vidMapIndex = -1;
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#define VIDMAPPTR(p) ((VidMapPtr)((p)->privates[vidMapIndex].ptr))
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static VidMemInfo vidMemInfo = { FALSE, };
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static VidMapRec vidMapRec = { TRUE, X_DEFAULT, FALSE, NULL };
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static VidMapPtr
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getVidMapRec(int scrnIndex)
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{
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VidMapPtr vp;
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ScrnInfoPtr pScrn;
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if ((scrnIndex < 0) || !(pScrn = xf86Screens[scrnIndex]))
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return &vidMapRec;
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if (vidMapIndex < 0)
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vidMapIndex = xf86AllocateScrnInfoPrivateIndex();
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if (VIDMAPPTR(pScrn) != NULL)
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return VIDMAPPTR(pScrn);
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vp = pScrn->privates[vidMapIndex].ptr = xnfcalloc(sizeof(VidMapRec), 1);
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vp->mtrrEnabled = TRUE; /* default to enabled */
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vp->mtrrFrom = X_DEFAULT;
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vp->mtrrOptChecked = FALSE;
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vp->pScrn = pScrn;
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return vp;
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}
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enum { OPTION_MTRR };
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static const OptionInfoRec opts[] = {
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{OPTION_MTRR, "mtrr", OPTV_BOOLEAN, {0}, FALSE},
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{-1, NULL, OPTV_NONE, {0}, FALSE}
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};
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static void
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checkMtrrOption(VidMapPtr vp)
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{
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if (!vp->mtrrOptChecked && vp->pScrn && vp->pScrn->options != NULL) {
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OptionInfoPtr options;
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options = xnfalloc(sizeof(opts));
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(void) memcpy(options, opts, sizeof(opts));
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xf86ProcessOptions(vp->pScrn->scrnIndex, vp->pScrn->options, options);
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if (xf86GetOptValBool(options, OPTION_MTRR, &vp->mtrrEnabled))
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vp->mtrrFrom = X_CONFIG;
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free(options);
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vp->mtrrOptChecked = TRUE;
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}
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}
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void
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xf86InitVidMem(void)
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{
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if (!vidMemInfo.initialised) {
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memset(&vidMemInfo, 0, sizeof(VidMemInfo));
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xf86OSInitVidMem(&vidMemInfo);
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}
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}
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Bool
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xf86CheckMTRR(int ScreenNum)
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{
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VidMapPtr vp = getVidMapRec(ScreenNum);
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/*
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* Check the "mtrr" option even when MTRR isn't supported to avoid
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* warnings about unrecognised options.
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*/
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checkMtrrOption(vp);
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if (vp->mtrrEnabled)
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return TRUE;
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return FALSE;
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}
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Bool
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xf86LinearVidMem(void)
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{
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xf86InitVidMem();
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return vidMemInfo.linearSupported;
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}
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