Initial revisionXORG-STABLE

1 files changed, 662 insertions, 0 deletions

diff --git a/src/i810_accel.c b/src/i810_accel.c
new file mode 100644
index 00000000..17c24b37
--- /dev/null
+++ b/src/i810_accel.c
@@ -0,0 +1,662 @@
+
+/**************************************************************************
+
+Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sub license, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice (including the
+next paragraph) shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/i810/i810_accel.c,v 1.17 2002/11/25 14:04:59 eich Exp $ */
+
+/*
+ * Reformatted with GNU indent (2.2.8), using the following options:
+ *
+ *    -bad -bap -c41 -cd0 -ncdb -ci6 -cli0 -cp0 -ncs -d0 -di3 -i3 -ip3 -l78
+ *    -lp -npcs -psl -sob -ss -br -ce -sc -hnl
+ *
+ * This provides a good match with the original i810 code and preferred
+ * XFree86 formatting conventions.
+ *
+ * When editing this driver, please follow the existing formatting, and edit
+ * with <TAB> characters expanded at 8-column intervals.
+ */
+
+/*
+ * Authors:
+ *   Keith Whitwell <keith@tungstengraphics.com>
+ *
+ */
+
+#include "xf86_ansic.h"
+#include "xf86.h"
+
+#include "i810.h"
+
+static unsigned int i810Rop[16] = {
+   0x00,				/* GXclear      */
+   0x88,				/* GXand        */
+   0x44,				/* GXandReverse */
+   0xCC,				/* GXcopy       */
+   0x22,				/* GXandInvert  */
+   0xAA,				/* GXnoop       */
+   0x66,				/* GXxor        */
+   0xEE,				/* GXor         */
+   0x11,				/* GXnor        */
+   0x99,				/* GXequiv      */
+   0x55,				/* GXinvert     */
+   0xDD,				/* GXorReverse  */
+   0x33,				/* GXcopyInvert */
+   0xBB,				/* GXorInverted */
+   0x77,				/* GXnand       */
+   0xFF					/* GXset        */
+};
+
+static unsigned int i810PatternRop[16] = {
+   0x00,				/* GXclear      */
+   0xA0,				/* GXand        */
+   0x50,				/* GXandReverse */
+   0xF0,				/* GXcopy       */
+   0x0A,				/* GXandInvert  */
+   0xAA,				/* GXnoop       */
+   0x5A,				/* GXxor        */
+   0xFA,				/* GXor         */
+   0x05,				/* GXnor        */
+   0xA5,				/* GXequiv      */
+   0x55,				/* GXinvert     */
+   0xF5,				/* GXorReverse  */
+   0x0F,				/* GXcopyInvert */
+   0xAF,				/* GXorInverted */
+   0x5F,				/* GXnand       */
+   0xFF					/* GXset        */
+};
+
+static void I810SetupForMono8x8PatternFill(ScrnInfoPtr pScrn,
+					   int pattx, int patty,
+					   int fg, int bg, int rop,
+					   unsigned int planemask);
+static void I810SubsequentMono8x8PatternFillRect(ScrnInfoPtr pScrn,
+						 int pattx, int patty,
+						 int x, int y, int w, int h);
+
+static void I810SetupForScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn,
+							   int fg, int bg,
+							   int rop,
+							   unsigned int mask);
+
+static void I810SubsequentScanlineCPUToScreenColorExpandFill(ScrnInfoPtr
+							     pScrn, int x,
+							     int y, int w,
+							     int h,
+							     int skipleft);
+
+static void I810SubsequentColorExpandScanline(ScrnInfoPtr pScrn, int bufno);
+
+/* The following function sets up the supported acceleration. Call it
+ * from the FbInit() function in the SVGA driver, or before ScreenInit
+ * in a monolithic server.
+ */
+Bool
+I810AccelInit(ScreenPtr pScreen)
+{
+   XAAInfoRecPtr infoPtr;
+   ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810AccelInit\n");
+
+   pI810->AccelInfoRec = infoPtr = XAACreateInfoRec();
+   if (!infoPtr)
+      return FALSE;
+
+   pI810->bufferOffset = 0;
+   infoPtr->Flags = LINEAR_FRAMEBUFFER | OFFSCREEN_PIXMAPS;
+   /* There is a bit blt bug in 24 bpp.  This is a problem, but
+    * at least without the pixmap cache we can pass the test suite */
+   if (pScrn->depth != 24)
+      infoPtr->Flags |= PIXMAP_CACHE;
+
+   /* Sync
+    */
+   infoPtr->Sync = I810Sync;
+
+   /* Solid filled rectangles 
+    */
+   {
+      infoPtr->SolidFillFlags = NO_PLANEMASK;
+      infoPtr->SetupForSolidFill = I810SetupForSolidFill;
+      infoPtr->SubsequentSolidFillRect = I810SubsequentSolidFillRect;
+   }
+
+   /* Screen to screen copy 
+    *   - the transparency op hangs the blit engine, disable for now.
+    */
+   {
+      infoPtr->ScreenToScreenCopyFlags = (0
+					  | NO_PLANEMASK
+					  | NO_TRANSPARENCY | 0);
+
+      infoPtr->SetupForScreenToScreenCopy = I810SetupForScreenToScreenCopy;
+      infoPtr->SubsequentScreenToScreenCopy =
+	    I810SubsequentScreenToScreenCopy;
+   }
+
+   /* 8x8 pattern fills 
+    */
+   {
+      infoPtr->SetupForMono8x8PatternFill = I810SetupForMono8x8PatternFill;
+      infoPtr->SubsequentMono8x8PatternFillRect =
+	    I810SubsequentMono8x8PatternFillRect;
+
+      infoPtr->Mono8x8PatternFillFlags = (HARDWARE_PATTERN_PROGRAMMED_BITS |
+					  HARDWARE_PATTERN_SCREEN_ORIGIN |
+					  BIT_ORDER_IN_BYTE_MSBFIRST |
+					  NO_PLANEMASK | 0);
+   }
+
+   /* 8x8 color fills - not considered useful for XAA.
+    */
+
+   /* Scanline color expansion - Use the same scheme as the 3.3 driver.  
+    *
+    */
+   if (pI810->Scratch.Size != 0) {
+      int i;
+      int width = ((pScrn->displayWidth + 31) & ~31) / 8;
+      int nr_buffers = pI810->Scratch.Size / width;
+      unsigned char *ptr = pI810->FbBase + pI810->Scratch.Start;
+
+      pI810->NumScanlineColorExpandBuffers = nr_buffers;
+      pI810->ScanlineColorExpandBuffers = (unsigned char **)
+	    xnfcalloc(nr_buffers, sizeof(unsigned char *));
+
+      for (i = 0; i < nr_buffers; i++, ptr += width)
+	 pI810->ScanlineColorExpandBuffers[i] = ptr;
+
+      infoPtr->ScanlineCPUToScreenColorExpandFillFlags = (NO_PLANEMASK |
+							  ROP_NEEDS_SOURCE |
+							  BIT_ORDER_IN_BYTE_MSBFIRST
+							  | 0);
+
+      infoPtr->ScanlineColorExpandBuffers = (unsigned char **)
+	    xnfcalloc(1, sizeof(unsigned char *));
+      infoPtr->NumScanlineColorExpandBuffers = 1;
+
+      infoPtr->ScanlineColorExpandBuffers[0] =
+	    pI810->ScanlineColorExpandBuffers[0];
+      pI810->nextColorExpandBuf = 0;
+
+      infoPtr->SetupForScanlineCPUToScreenColorExpandFill =
+	    I810SetupForScanlineCPUToScreenColorExpandFill;
+
+      infoPtr->SubsequentScanlineCPUToScreenColorExpandFill =
+	    I810SubsequentScanlineCPUToScreenColorExpandFill;
+
+      infoPtr->SubsequentColorExpandScanline =
+	    I810SubsequentColorExpandScanline;
+   }
+
+   /* Possible todo: Image writes w/ non-GXCOPY rop.
+    */
+
+   I810SelectBuffer(pScrn, I810_SELECT_FRONT);
+
+   return XAAInit(pScreen, infoPtr);
+}
+
+int
+I810WaitLpRing(ScrnInfoPtr pScrn, int n, int timeout_millis)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+   I810RingBuffer *ring = &(pI810->LpRing);
+   int iters = 0;
+   int start = 0;
+   int now = 0;
+   int last_head = 0;
+   int first = 0;
+
+   /* If your system hasn't moved the head pointer in 2 seconds, I'm going to
+    * call it crashed.
+    */
+   if (timeout_millis == 0)
+      timeout_millis = 2000;
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
+      ErrorF("I810WaitLpRing %d\n", n);
+      first = GetTimeInMillis();
+   }
+
+   while (ring->space < n) {
+      ring->head = INREG(LP_RING + RING_HEAD) & HEAD_ADDR;
+      ring->space = ring->head - (ring->tail + 8);
+
+      if (ring->space < 0)
+	 ring->space += ring->mem.Size;
+
+      iters++;
+      now = GetTimeInMillis();
+      if (start == 0 || now < start || ring->head != last_head) {
+	 if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+	    if (now > start)
+	       ErrorF("space: %d wanted %d\n", ring->space, n);
+	 start = now;
+	 last_head = ring->head;
+      } else if (now - start > timeout_millis) {
+	 ErrorF("Error in I810WaitLpRing(), now is %d, start is %d\n", now,
+		start);
+	 I810PrintErrorState(pScrn);
+	 ErrorF("space: %d wanted %d\n", ring->space, n);
+#ifdef XF86DRI
+	 if (pI810->directRenderingEnabled) {
+	    DRIUnlock(screenInfo.screens[pScrn->scrnIndex]);
+	    DRICloseScreen(screenInfo.screens[pScrn->scrnIndex]);
+	 }
+#endif
+	 pI810->AccelInfoRec = NULL;	/* Stops recursive behavior */
+	 FatalError("lockup\n");
+      }
+
+      DELAY(10000);
+   }
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
+      now = GetTimeInMillis();
+      if (now - first) {
+	 ErrorF("Elapsed %d ms\n", now - first);
+	 ErrorF("space: %d wanted %d\n", ring->space, n);
+      }
+   }
+
+   return iters;
+}
+
+void
+I810Sync(ScrnInfoPtr pScrn)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & (DEBUG_VERBOSE_ACCEL | DEBUG_VERBOSE_SYNC))
+      ErrorF("I810Sync\n");
+
+#ifdef XF86DRI
+   /* VT switching tries to do this.  
+    */
+   if (!pI810->LockHeld && pI810->directRenderingEnabled) {
+      return;
+   }
+#endif
+
+   /* Send a flush instruction and then wait till the ring is empty.
+    * This is stronger than waiting for the blitter to finish as it also
+    * flushes the internal graphics caches.
+    */
+   {
+      BEGIN_LP_RING(2);
+      OUT_RING(INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE);
+      OUT_RING(0);			/* pad to quadword */
+      ADVANCE_LP_RING();
+   }
+
+   I810WaitLpRing(pScrn, pI810->LpRing.mem.Size - 8, 0);
+
+   pI810->LpRing.space = pI810->LpRing.mem.Size - 8;
+   pI810->nextColorExpandBuf = 0;
+}
+
+void
+I810SetupForSolidFill(ScrnInfoPtr pScrn, int color, int rop,
+		      unsigned int planemask)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SetupForFillRectSolid color: %x rop: %x mask: %x\n",
+	     color, rop, planemask);
+
+   /* Color blit, p166 */
+   pI810->BR[13] = (BR13_SOLID_PATTERN |
+		    (i810PatternRop[rop] << 16) |
+		    (pScrn->displayWidth * pI810->cpp));
+   pI810->BR[16] = color;
+}
+
+void
+I810SubsequentSolidFillRect(ScrnInfoPtr pScrn, int x, int y, int w, int h)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SubsequentFillRectSolid %d,%d %dx%d\n", x, y, w, h);
+
+   {
+      BEGIN_LP_RING(6);
+
+      OUT_RING(BR00_BITBLT_CLIENT | BR00_OP_COLOR_BLT | 0x3);
+      OUT_RING(pI810->BR[13]);
+      OUT_RING((h << 16) | (w * pI810->cpp));
+      OUT_RING(pI810->bufferOffset +
+	       (y * pScrn->displayWidth + x) * pI810->cpp);
+
+      OUT_RING(pI810->BR[16]);
+      OUT_RING(0);			/* pad to quadword */
+
+      ADVANCE_LP_RING();
+   }
+}
+
+void
+I810SetupForScreenToScreenCopy(ScrnInfoPtr pScrn, int xdir, int ydir, int rop,
+			       unsigned int planemask, int transparency_color)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SetupForScreenToScreenCopy %d %d %x %x %d\n",
+	     xdir, ydir, rop, planemask, transparency_color);
+
+   pI810->BR[13] = (pScrn->displayWidth * pI810->cpp);
+
+   if (ydir == -1)
+      pI810->BR[13] = (-pI810->BR[13]) & 0xFFFF;
+   if (xdir == -1)
+      pI810->BR[13] |= BR13_RIGHT_TO_LEFT;
+
+   pI810->BR[13] |= i810Rop[rop] << 16;
+
+   pI810->BR[18] = 0;
+}
+
+void
+I810SubsequentScreenToScreenCopy(ScrnInfoPtr pScrn, int x1, int y1,
+				 int x2, int y2, int w, int h)
+{
+    I810Ptr pI810 = I810PTR(pScrn);
+    int src, dst;
+    int w_back = w;
+
+    if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+	ErrorF( "I810SubsequentScreenToScreenCopy %d,%d - %d,%d %dx%d\n",
+		x1,y1,x2,y2,w,h);
+    /* 
+     * This works around a bug in the i810 drawing engine.
+     * This was developed empirically so it may not catch all
+     * cases.
+     */
+    if ( !(pI810->BR[13] & BR13_RIGHT_TO_LEFT) && (y2 - y1) < 3 
+	 && (y2 - y1) >= 0 && (x2 - x1) <= (w + 4) && (w > 4))
+	w = 4;
+    do {
+
+	if (pI810->BR[13] & BR13_PITCH_SIGN_BIT) {
+	    src = (y1 + h - 1) * pScrn->displayWidth * pI810->cpp;
+	    dst = (y2 + h - 1) * pScrn->displayWidth * pI810->cpp;
+	} else {
+	    src = y1 * pScrn->displayWidth * pI810->cpp;
+	    dst = y2 * pScrn->displayWidth * pI810->cpp;
+	}
+
+	if (pI810->BR[13] & BR13_RIGHT_TO_LEFT) {
+	    src += (x1 + w - 1) * pI810->cpp + pI810->cpp - 1;
+	    dst += (x2 + w - 1) * pI810->cpp + pI810->cpp - 1;
+	} else {
+	    src += x1 * pI810->cpp;
+	    dst += x2 * pI810->cpp;
+	}
+
+
+	/* SRC_COPY_BLT, p169 */
+	{
+	    BEGIN_LP_RING(6);
+	    OUT_RING( BR00_BITBLT_CLIENT | BR00_OP_SRC_COPY_BLT | 0x4 );
+	    OUT_RING( pI810->BR[13]);
+
+	    OUT_RING( (h << 16) | (w * pI810->cpp));
+	    OUT_RING( pI810->bufferOffset + dst);
+
+	    OUT_RING( pI810->BR[13] & 0xFFFF);
+	    OUT_RING( pI810->bufferOffset + src);
+	    ADVANCE_LP_RING();
+	}
+	w_back -= w;
+	if (w_back <= 0)
+	    break;
+	x2 += w;
+	x1 += w;
+	w = w_back;
+    }  while (1);
+}
+
+static void
+I810SetupForMono8x8PatternFill(ScrnInfoPtr pScrn, int pattx, int patty,
+			       int fg, int bg, int rop,
+			       unsigned int planemask)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SetupFor8x8PatternColorExpand\n");
+
+   /* FULL_MONO_PAT_BLT, p176 */
+   pI810->BR[0] = (BR00_BITBLT_CLIENT | BR00_OP_MONO_PAT_BLT | 0x9);
+   pI810->BR[18] = bg;
+   pI810->BR[19] = fg;
+   pI810->BR[13] = (pScrn->displayWidth * pI810->cpp);
+   pI810->BR[13] |= i810PatternRop[rop] << 16;
+   if (bg == -1)
+      pI810->BR[13] |= BR13_MONO_TRANSPCY;
+}
+
+static void
+I810SubsequentMono8x8PatternFillRect(ScrnInfoPtr pScrn, int pattx, int patty,
+				     int x, int y, int w, int h)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+   int addr =
+	 pI810->bufferOffset + (y * pScrn->displayWidth + x) * pI810->cpp;
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810Subsequent8x8PatternColorExpand\n");
+
+   {
+      BEGIN_LP_RING(12);
+      OUT_RING(pI810->BR[0] | ((y << 5) & BR00_PAT_VERT_ALIGN));
+      OUT_RING(pI810->BR[13]);
+      OUT_RING((h << 16) | (w * pI810->cpp));
+      OUT_RING(addr);
+      OUT_RING(pI810->BR[13] & 0xFFFF);	/* src pitch */
+      OUT_RING(addr);			/* src addr */
+      OUT_RING(0);			/* transparency color */
+      OUT_RING(pI810->BR[18]);		/* bg */
+      OUT_RING(pI810->BR[19]);		/* fg */
+      OUT_RING(pattx);			/* pattern data */
+      OUT_RING(patty);
+      OUT_RING(0);
+      ADVANCE_LP_RING();
+   }
+}
+
+static void
+I810GetNextScanlineColorExpandBuffer(ScrnInfoPtr pScrn)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+   XAAInfoRecPtr infoPtr = pI810->AccelInfoRec;
+
+   if (pI810->nextColorExpandBuf == pI810->NumScanlineColorExpandBuffers)
+      I810Sync(pScrn);
+
+   infoPtr->ScanlineColorExpandBuffers[0] =
+	 pI810->ScanlineColorExpandBuffers[pI810->nextColorExpandBuf];
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("using color expand buffer %d\n", pI810->nextColorExpandBuf);
+
+   pI810->nextColorExpandBuf++;
+}
+
+static void
+I810SetupForScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn,
+					       int fg, int bg, int rop,
+					       unsigned int planemask)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SetupForScanlineScreenToScreenColorExpand %d %d %x %x\n",
+	     fg, bg, rop, planemask);
+
+   pI810->BR[13] = (pScrn->displayWidth * pI810->cpp);
+   pI810->BR[13] |= i810Rop[rop] << 16;
+   pI810->BR[13] |= (1 << 27);
+   if (bg == -1)
+      pI810->BR[13] |= BR13_MONO_TRANSPCY;
+
+   pI810->BR[18] = bg;
+   pI810->BR[19] = fg;
+
+   I810GetNextScanlineColorExpandBuffer(pScrn);
+}
+
+static void
+I810SubsequentScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn,
+						 int x, int y,
+						 int w, int h, int skipleft)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SubsequentScanlineCPUToScreenColorExpandFill "
+	     "%d,%d %dx%x %d\n", x, y, w, h, skipleft);
+
+   pI810->BR[0] = BR00_BITBLT_CLIENT | BR00_OP_MONO_SRC_COPY_BLT | 0x06;
+   pI810->BR[9] = (pI810->bufferOffset +
+		   (y * pScrn->displayWidth + x) * pI810->cpp);
+   pI810->BR[14] = ((1 << 16) | (w * pI810->cpp));
+   pI810->BR[11] = ((w + 31) / 32) - 1;
+}
+
+static void
+I810SubsequentColorExpandScanline(ScrnInfoPtr pScrn, int bufno)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   pI810->BR[12] = (pI810->AccelInfoRec->ScanlineColorExpandBuffers[0] -
+		    pI810->FbBase);
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SubsequentColorExpandScanline %d (addr %x)\n",
+	     bufno, pI810->BR[12]);
+
+   {
+      BEGIN_LP_RING(8);
+      OUT_RING(pI810->BR[0]);
+      OUT_RING(pI810->BR[13]);
+      OUT_RING(pI810->BR[14]);
+      OUT_RING(pI810->BR[9]);
+      OUT_RING(pI810->BR[11]);
+      OUT_RING(pI810->BR[12]);		/* srcaddr */
+      OUT_RING(pI810->BR[18]);
+      OUT_RING(pI810->BR[19]);
+      ADVANCE_LP_RING();
+   }
+
+   /* Advance to next scanline.
+    */
+   pI810->BR[9] += pScrn->displayWidth * pI810->cpp;
+   I810GetNextScanlineColorExpandBuffer(pScrn);
+}
+
+void
+I810EmitFlush(ScrnInfoPtr pScrn)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   BEGIN_LP_RING(2);
+   OUT_RING(INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE);
+   OUT_RING(0);
+   ADVANCE_LP_RING();
+}
+
+void
+I810SelectBuffer(ScrnInfoPtr pScrn, int buffer)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   switch (buffer) {
+   case I810_SELECT_BACK:
+      pI810->bufferOffset = pI810->BackBuffer.Start;
+      break;
+   case I810_SELECT_DEPTH:
+      pI810->bufferOffset = pI810->DepthBuffer.Start;
+      break;
+   default:
+   case I810_SELECT_FRONT:
+      pI810->bufferOffset = pI810->FrontBuffer.Start;
+      break;
+   }
+
+   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
+      ErrorF("I810SelectBuffer %d --> offset %x\n",
+	     buffer, pI810->bufferOffset);
+}
+
+void
+I810RefreshRing(ScrnInfoPtr pScrn)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   pI810->LpRing.head = INREG(LP_RING + RING_HEAD) & HEAD_ADDR;
+   pI810->LpRing.tail = INREG(LP_RING + RING_TAIL);
+   pI810->LpRing.space = pI810->LpRing.head - (pI810->LpRing.tail + 8);
+   if (pI810->LpRing.space < 0)
+      pI810->LpRing.space += pI810->LpRing.mem.Size;
+
+   pI810->AccelInfoRec->NeedToSync = TRUE;
+}
+
+/* Emit on gaining VT?
+ */
+void
+I810EmitInvarientState(ScrnInfoPtr pScrn)
+{
+   I810Ptr pI810 = I810PTR(pScrn);
+
+   BEGIN_LP_RING(10);
+
+   OUT_RING(INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE);
+   OUT_RING(GFX_CMD_CONTEXT_SEL | CS_UPDATE_USE | CS_USE_CTX0);
+   OUT_RING(INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE);
+   OUT_RING(0);
+
+   OUT_RING(GFX_OP_COLOR_CHROMA_KEY);
+   OUT_RING(CC1_UPDATE_KILL_WRITE |
+	    CC1_DISABLE_KILL_WRITE |
+	    CC1_UPDATE_COLOR_IDX |
+	    CC1_UPDATE_CHROMA_LOW | CC1_UPDATE_CHROMA_HI | 0);
+   OUT_RING(0);
+   OUT_RING(0);
+
+/*     OUT_RING( CMD_OP_Z_BUFFER_INFO ); */
+/*     OUT_RING( pI810->DepthBuffer.Start | pI810->auxPitchBits); */
+
+   ADVANCE_LP_RING();
+}
+