rasops_masks.h

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    1 /*      $NetBSD: rasops_masks.h,v 1.6 2001/01/12 23:03:52 bjh21 Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Andrew Doran.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #ifndef _RASOPS_MASKS_H_
   40 #define _RASOPS_MASKS_H_ 1
   41 
   42 #include <sys/types.h>
   43 #include <machine/endian.h>
   44 
   45 /*
   46  * Convenience macros. To get around the problem of dealing with properly
   47  * ordered bits on little-endian machines, we just convert everything to
   48  * big-endian and back again when we're done.
   49  *
   50  * MBL: move bits left
   51  * MBR: move bits right
   52  * MBE: make big-endian
   53  */
   54 #if BYTE_ORDER == BIG_ENDIAN
   55 
   56 #define MBL(x,y)        ((y) > 31 ? 0 : (x) >> (y))
   57 #define MBR(x,y)        ((y) > 31 ? 0 : (x) << (y))
   58 #define MBE(x)          (x)
   59 
   60 #else
   61 
   62 #define MBL(x,y)        ((y) > 31 ? 0 : MBE(MBE(x) << (y)))
   63 #define MBR(x,y)        ((y) > 31 ? 0 : MBE(MBE(x) >> (y)))
   64 #define MBE(x)          ( (((x) & 0x000000FFU) << 24) \
   65                         | (((x) & 0x0000FF00U) <<  8) \
   66                         | (((x) & 0x00FF0000U) >>  8) \
   67                         | (((x) & 0xFF000000U) >> 24) )
   68 #endif
   69 
   70 /*
   71  * Using GETBITS() and PUTBITS() inside a loop mightn't be such a good idea.
   72  * There's probably some CSE and strength-reduction that the compiler won't
   73  * even think about - really should have a few assumptions/separate cases.
   74  */
   75 
   76 /* Get a number of bits ( <= 32 ) from *sp and store in dw */
   77 #define GETBITS(sp, x, w, dw) do {                                      \
   78         dw = MBL(*(sp), (x));                                           \
   79         if (((x) + (w)) > 32)                                           \
   80                 dw |= (MBR((sp)[1], 32 - (x)));                         \
   81 } while(0);
   82 
   83 /* Put a number of bits ( <= 32 ) from sw to *dp */
   84 #define PUTBITS(sw, x, w, dp) do {                                      \
   85         int n = (x) + (w) - 32;                                         \
   86                                                                         \
   87         if (n <= 0) {                                                   \
   88                 n = rasops_pmask[x & 31][w & 31];                       \
   89                 *(dp) = (*(dp) & ~n) | (MBR(sw, x) & n);                \
   90         } else {                                                        \
   91                 *(dp) = (*(dp) & rasops_rmask[x]) | (MBR((sw), x));     \
   92                 (dp)[1] = ((dp)[1] & rasops_rmask[n]) |                 \
   93                         (MBL(sw, 32-(x)) & rasops_lmask[n]);            \
   94         }                                                               \
   95 } while(0);
   96 
   97 /* rasops_masks.c */
   98 extern const int32_t    rasops_lmask[32+1];
   99 extern const int32_t    rasops_rmask[32+1];
  100 extern const int32_t    rasops_pmask[32][32];
  101 
  102 #endif /* _RASOPS_MASKS_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/dev/rasops/rasops_masks.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/rasops/rasops_masks.h