1 /* $NetBSD: maskbits.h,v 1.4 2001/11/16 08:14:05 gmcgarry 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 36 */ 37 38 /* 39 * Derived from X11R4 40 */ 41 42 /* the following notes use the following conventions: 43 SCREEN LEFT SCREEN RIGHT 44 in this file and maskbits.c, left and right refer to screen coordinates, 45 NOT bit numbering in registers. 46 47 starttab[n] 48 bits[0,n-1] = 0 bits[n,31] = 1 49 endtab[n] = 50 bits[0,n-1] = 1 bits[n,31] = 0 51 52 maskbits(x, w, startmask, endmask, nlw) 53 for a span of width w starting at position x, returns 54 a mask for ragged bits at start, mask for ragged bits at end, 55 and the number of whole longwords between the ends. 56 57 */ 58 59 #define maskbits(x, w, startmask, endmask, nlw) \ 60 startmask = starttab[(x)&0x1f]; \ 61 endmask = endtab[((x)+(w)) & 0x1f]; \ 62 if (startmask) \ 63 nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 64 else \ 65 nlw = (w) >> 5; 66 67 #define FASTGETBITS(psrc, x, w, dst) \ 68 asm ("bfextu %3{%1:%2},%0" \ 69 : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 70 71 #define FASTPUTBITS(src, x, w, pdst) \ 72 asm ("bfins %3,%0{%1:%2}" \ 73 : "=o" (*(char *)(pdst)) \ 74 : "di" (x), "di" (w), "d" (src)) 75 76 #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 77 { \ 78 unsigned int _tmpsrc, _tmpdst; \ 79 FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 80 FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 81 DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 82 FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 83 } 84 85 #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 86 getandputrop(psrc, srcbit, 0, width, pdst, rop) 87 88 #define getunalignedword(psrc, x, dst) { \ 89 int _tmp; \ 90 FASTGETBITS(psrc, x, 32, _tmp); \ 91 dst = _tmp; \ 92 } 93 94 #define fnCLEAR(src, dst) (0) 95 #define fnCOPY(src, dst) (src) 96 #define fnXOR(src, dst) (src ^ dst) 97 #define fnCOPYINVERTED(src, dst)(~src) 98 99 #define DoRop(result, alu, src, dst) \ 100 { \ 101 if (alu == RR_COPY) \ 102 result = fnCOPY (src, dst); \ 103 else \ 104 switch (alu) \ 105 { \ 106 case RR_CLEAR: \ 107 result = fnCLEAR (src, dst); \ 108 break; \ 109 case RR_XOR: \ 110 result = fnXOR (src, dst); \ 111 break; \ 112 case RR_COPYINVERTED: \ 113 result = fnCOPYINVERTED (src, dst); \ 114 break; \ 115 } \ 116 } 117