1 /* $NetBSD: maskbits.h,v 1.1 2011/02/07 13:11:41 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 32 */ 33 34 /* 35 * Derived from X11R4 36 */ 37 38 /* the following notes use the following conventions: 39 SCREEN LEFT SCREEN RIGHT 40 in this file and maskbits.c, left and right refer to screen coordinates, 41 NOT bit numbering in registers. 42 43 starttab[n] 44 bits[0,n-1] = 0 bits[n,31] = 1 45 endtab[n] = 46 bits[0,n-1] = 1 bits[n,31] = 0 47 48 maskbits(x, w, startmask, endmask, nlw) 49 for a span of width w starting at position x, returns 50 a mask for ragged bits at start, mask for ragged bits at end, 51 and the number of whole longwords between the ends. 52 53 */ 54 55 #define maskbits(x, w, startmask, endmask, nlw) \ 56 do { \ 57 startmask = starttab[(x) & 0x1f]; \ 58 endmask = endtab[((x)+(w)) & 0x1f]; \ 59 if (startmask) \ 60 nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 61 else \ 62 nlw = (w) >> 5; \ 63 } while (/* CONSTCOND */ 0) 64 65 #define FASTGETBITS(psrc, x, w, dst) \ 66 __asm ("bfextu %3{%1:%2},%0" \ 67 : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 68 69 #define FASTPUTBITS(src, x, w, pdst) \ 70 __asm ("bfins %3,%0{%1:%2}" \ 71 : "=o" (*(char *)(pdst)) \ 72 : "di" (x), "di" (w), "d" (src)) 73 74 #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 75 do { \ 76 unsigned int _tmpsrc, _tmpdst; \ 77 FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 78 FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 79 DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 80 FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 81 } while (/* CONSTCOND */ 0) 82 83 #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 84 getandputrop(psrc, srcbit, 0, width, pdst, rop) 85 86 #define getunalignedword(psrc, x, dst) \ 87 do { \ 88 int _tmp; \ 89 FASTGETBITS(psrc, x, 32, _tmp); \ 90 dst = _tmp; \ 91 } while (/* CONSTCOND */ 0) 92 93 #define fnCLEAR(src, dst) (0) 94 #define fnCOPY(src, dst) (src) 95 #define fnXOR(src, dst) (src ^ dst) 96 #define fnCOPYINVERTED(src, dst)(~src) 97 98 #define DoRop(result, alu, src, dst) \ 99 do { \ 100 if (alu == RR_COPY) \ 101 result = fnCOPY (src, dst); \ 102 else { \ 103 switch (alu) { \ 104 case RR_CLEAR: \ 105 result = fnCLEAR (src, dst); \ 106 break; \ 107 case RR_XOR: \ 108 result = fnXOR (src, dst); \ 109 break; \ 110 case RR_COPYINVERTED: \ 111 result = fnCOPYINVERTED (src, dst); \ 112 break; \ 113 } \ 114 } \ 115 } while (/* CONSTCOND */ 0) 116