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/*
* Copyright 1997 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
*
* 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 Marc Aurele La France not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Marc Aurele La France makes no representations
* about the suitability of this software for any purpose. It is provided
* "as-is" without express or implied warranty.
*
* MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
* EVENT SHALL MARC AURELE LA FRANCE 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ati.h"
#include "atiadjust.h"
#include "atichip.h"
#include "atilock.h"
#include "atimach64io.h"
#include "atiwonderio.h"
/*
* The display start address is expressed in units of 32-bit (VGA) or 64-bit
* (accelerator) words where all planar modes are considered as 4bpp modes.
* These functions ensure the start address does not exceed architectural
* limits. Also, to avoid colour changes while panning, these 32-bit or 64-bit
* boundaries may not fall within a pixel.
*/
/*
* ATIAjustPreInit --
*
* This function calculates values needed to speed up the setting of the
* display start address.
*/
void
ATIAdjustPreInit
(
ATIPtr pATI
)
{
unsigned long MaxBase;
{
pATI->AdjustDepth = (pATI->bitsPerPixel + 7) >> 3;
pATI->AdjustMask = 64;
while (pATI->AdjustMask % (unsigned long)(pATI->AdjustDepth))
pATI->AdjustMask += 64;
pATI->AdjustMask =
~(((pATI->AdjustMask / (unsigned long)(pATI->AdjustDepth)) >> 3) -
1);
}
{
pATI->AdjustMaxBase = MaxBits(CRTC_OFFSET) << 3;
}
MaxBase = (pATI->AdjustMaxBase / (unsigned long)pATI->AdjustDepth) |
~pATI->AdjustMask;
pATI->AdjustMaxX = MaxBase % pATI->displayWidth;
pATI->AdjustMaxY = MaxBase / pATI->displayWidth;
}
/*
* ATIAdjustFrame --
*
* This function is used to initialise the SVGA Start Address - the first
* displayed location in video memory. This is used to implement the virtual
* window.
*/
void
ATIAdjustFrame
(
int scrnIndex,
int x,
int y,
int flags
)
{
ScrnInfoPtr pScreenInfo = xf86Screens[scrnIndex];
ATIPtr pATI = ATIPTR(pScreenInfo);
int Base, xy;
/*
* Assume the caller has already done its homework in ensuring the physical
* screen is still contained in the virtual resolution.
*/
if (y >= pATI->AdjustMaxY)
{
y = pATI->AdjustMaxY;
if (x > pATI->AdjustMaxX)
y--;
}
Base = ((((y * pATI->displayWidth) + x) & pATI->AdjustMask) *
pATI->AdjustDepth) >> 3;
if (!pATI->currentMode)
{
/*
* Not in DGA. This reverse-calculates pScreenInfo->frame[XY][01] so
* that the cursor does not move on mode switches.
*/
xy = (Base << 3) / pATI->AdjustDepth;
pScreenInfo->frameX0 = xy % pATI->displayWidth;
pScreenInfo->frameY0 = xy / pATI->displayWidth;
pScreenInfo->frameX1 =
pScreenInfo->frameX0 + pScreenInfo->currentMode->HDisplay - 1;
pScreenInfo->frameY1 =
pScreenInfo->frameY0 + pScreenInfo->currentMode->VDisplay - 1;
}
/* Unlock registers */
ATIUnlock(pATI);
{
outr(CRTC_OFF_PITCH, SetBits(pATI->displayWidth >> 3, CRTC_PITCH) |
SetBits(Base, CRTC_OFFSET));
}
}
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