91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
/**************************************************************************
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Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
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Copyright © 2002 David Dawes
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All Rights Reserved.
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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
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sub license, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice (including the
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next paragraph) shall be included in all copies or substantial portions
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of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
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ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************/
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#ifndef _INTEL_RING_H
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#define _INTEL_RING_H
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#define OUT_RING(n) do { \
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if (I810_DEBUG & DEBUG_VERBOSE_RING) \
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ErrorF("OUT_RING %lx: %x, (mask %x)\n", \
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(unsigned long)(outring), (unsigned int)(n), ringmask); \
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*(volatile unsigned int *)(virt + outring) = n; \
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outring += 4; ringused += 4; \
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outring &= ringmask; \
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} while (0)
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#define ADVANCE_LP_RING() do { \
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if (ringused > needed) \
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FatalError("%s: ADVANCE_LP_RING: exceeded allocation %d/%d\n ", \
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__FUNCTION__, ringused, needed); \
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else if (ringused < needed) \
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FatalError("%s: ADVANCE_LP_RING: under-used allocation %d/%d\n ", \
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__FUNCTION__, ringused, needed); \
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pI810->LpRing->tail = outring; \
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pI810->LpRing->space -= ringused; \
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if (outring & 0x07) \
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FatalError("%s: ADVANCE_LP_RING: " \
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"outring (0x%x) isn't on a QWord boundary\n", \
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__FUNCTION__, outring); \
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OUTREG(LP_RING + RING_TAIL, outring); \
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} while (0)
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/*
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* XXX Note: the head/tail masks are different for 810 and i830.
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* If the i810 always sets the higher bits to 0, then this shouldn't be
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* a problem. Check this!
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*/
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#define DO_RING_IDLE() do { \
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int _head; \
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int _tail; \
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do { \
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_head = INREG(LP_RING + RING_HEAD) & I830_HEAD_MASK; \
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_tail = INREG(LP_RING + RING_TAIL) & I830_TAIL_MASK; \
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DELAY(10); \
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} while (_head != _tail); \
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} while( 0)
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#define BEGIN_LP_RING(n) \
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unsigned int outring, ringmask, ringused = 0; \
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volatile unsigned char *virt; \
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int needed; \
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if ((n) & 1) \
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ErrorF("BEGIN_LP_RING called with odd argument: %d\n", n); \
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if ((n) > 2 && (I810_DEBUG&DEBUG_ALWAYS_SYNC)) \
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DO_RING_IDLE(); \
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needed = (n) * 4; \
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if (pI810->LpRing->space < needed) \
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WaitRingFunc(pScrn, needed, 0); \
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outring = pI810->LpRing->tail; \
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ringmask = pI810->LpRing->tail_mask; \
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virt = pI810->LpRing->virtual_start; \
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if (I810_DEBUG & DEBUG_VERBOSE_RING) \
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ErrorF( "BEGIN_LP_RING %d in %s\n", n, FUNCTION_NAME);
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#endif /* _INTEL_RING_H */
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