1*717693f2Stsutsui /* $NetBSD: maskbits.h,v 1.1 2011/02/07 13:11:41 tsutsui Exp $ */ 2*717693f2Stsutsui 3*717693f2Stsutsui /*- 4*717693f2Stsutsui * Copyright (c) 1994 5*717693f2Stsutsui * The Regents of the University of California. All rights reserved. 6*717693f2Stsutsui * 7*717693f2Stsutsui * Redistribution and use in source and binary forms, with or without 8*717693f2Stsutsui * modification, are permitted provided that the following conditions 9*717693f2Stsutsui * are met: 10*717693f2Stsutsui * 1. Redistributions of source code must retain the above copyright 11*717693f2Stsutsui * notice, this list of conditions and the following disclaimer. 12*717693f2Stsutsui * 2. Redistributions in binary form must reproduce the above copyright 13*717693f2Stsutsui * notice, this list of conditions and the following disclaimer in the 14*717693f2Stsutsui * documentation and/or other materials provided with the distribution. 15*717693f2Stsutsui * 3. Neither the name of the University nor the names of its contributors 16*717693f2Stsutsui * may be used to endorse or promote products derived from this software 17*717693f2Stsutsui * without specific prior written permission. 18*717693f2Stsutsui * 19*717693f2Stsutsui * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20*717693f2Stsutsui * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21*717693f2Stsutsui * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22*717693f2Stsutsui * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23*717693f2Stsutsui * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24*717693f2Stsutsui * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25*717693f2Stsutsui * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26*717693f2Stsutsui * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27*717693f2Stsutsui * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28*717693f2Stsutsui * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29*717693f2Stsutsui * SUCH DAMAGE. 30*717693f2Stsutsui * 31*717693f2Stsutsui * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 32*717693f2Stsutsui */ 33*717693f2Stsutsui 34*717693f2Stsutsui /* 35*717693f2Stsutsui * Derived from X11R4 36*717693f2Stsutsui */ 37*717693f2Stsutsui 38*717693f2Stsutsui /* the following notes use the following conventions: 39*717693f2Stsutsui SCREEN LEFT SCREEN RIGHT 40*717693f2Stsutsui in this file and maskbits.c, left and right refer to screen coordinates, 41*717693f2Stsutsui NOT bit numbering in registers. 42*717693f2Stsutsui 43*717693f2Stsutsui starttab[n] 44*717693f2Stsutsui bits[0,n-1] = 0 bits[n,31] = 1 45*717693f2Stsutsui endtab[n] = 46*717693f2Stsutsui bits[0,n-1] = 1 bits[n,31] = 0 47*717693f2Stsutsui 48*717693f2Stsutsui maskbits(x, w, startmask, endmask, nlw) 49*717693f2Stsutsui for a span of width w starting at position x, returns 50*717693f2Stsutsui a mask for ragged bits at start, mask for ragged bits at end, 51*717693f2Stsutsui and the number of whole longwords between the ends. 52*717693f2Stsutsui 53*717693f2Stsutsui */ 54*717693f2Stsutsui 55*717693f2Stsutsui #define maskbits(x, w, startmask, endmask, nlw) \ 56*717693f2Stsutsui do { \ 57*717693f2Stsutsui startmask = starttab[(x) & 0x1f]; \ 58*717693f2Stsutsui endmask = endtab[((x)+(w)) & 0x1f]; \ 59*717693f2Stsutsui if (startmask) \ 60*717693f2Stsutsui nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 61*717693f2Stsutsui else \ 62*717693f2Stsutsui nlw = (w) >> 5; \ 63*717693f2Stsutsui } while (/* CONSTCOND */ 0) 64*717693f2Stsutsui 65*717693f2Stsutsui #define FASTGETBITS(psrc, x, w, dst) \ 66*717693f2Stsutsui __asm ("bfextu %3{%1:%2},%0" \ 67*717693f2Stsutsui : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 68*717693f2Stsutsui 69*717693f2Stsutsui #define FASTPUTBITS(src, x, w, pdst) \ 70*717693f2Stsutsui __asm ("bfins %3,%0{%1:%2}" \ 71*717693f2Stsutsui : "=o" (*(char *)(pdst)) \ 72*717693f2Stsutsui : "di" (x), "di" (w), "d" (src)) 73*717693f2Stsutsui 74*717693f2Stsutsui #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 75*717693f2Stsutsui do { \ 76*717693f2Stsutsui unsigned int _tmpsrc, _tmpdst; \ 77*717693f2Stsutsui FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 78*717693f2Stsutsui FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 79*717693f2Stsutsui DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 80*717693f2Stsutsui FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 81*717693f2Stsutsui } while (/* CONSTCOND */ 0) 82*717693f2Stsutsui 83*717693f2Stsutsui #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 84*717693f2Stsutsui getandputrop(psrc, srcbit, 0, width, pdst, rop) 85*717693f2Stsutsui 86*717693f2Stsutsui #define getunalignedword(psrc, x, dst) \ 87*717693f2Stsutsui do { \ 88*717693f2Stsutsui int _tmp; \ 89*717693f2Stsutsui FASTGETBITS(psrc, x, 32, _tmp); \ 90*717693f2Stsutsui dst = _tmp; \ 91*717693f2Stsutsui } while (/* CONSTCOND */ 0) 92*717693f2Stsutsui 93*717693f2Stsutsui #define fnCLEAR(src, dst) (0) 94*717693f2Stsutsui #define fnCOPY(src, dst) (src) 95*717693f2Stsutsui #define fnXOR(src, dst) (src ^ dst) 96*717693f2Stsutsui #define fnCOPYINVERTED(src, dst)(~src) 97*717693f2Stsutsui 98*717693f2Stsutsui #define DoRop(result, alu, src, dst) \ 99*717693f2Stsutsui do { \ 100*717693f2Stsutsui if (alu == RR_COPY) \ 101*717693f2Stsutsui result = fnCOPY (src, dst); \ 102*717693f2Stsutsui else { \ 103*717693f2Stsutsui switch (alu) { \ 104*717693f2Stsutsui case RR_CLEAR: \ 105*717693f2Stsutsui result = fnCLEAR (src, dst); \ 106*717693f2Stsutsui break; \ 107*717693f2Stsutsui case RR_XOR: \ 108*717693f2Stsutsui result = fnXOR (src, dst); \ 109*717693f2Stsutsui break; \ 110*717693f2Stsutsui case RR_COPYINVERTED: \ 111*717693f2Stsutsui result = fnCOPYINVERTED (src, dst); \ 112*717693f2Stsutsui break; \ 113*717693f2Stsutsui } \ 114*717693f2Stsutsui } \ 115*717693f2Stsutsui } while (/* CONSTCOND */ 0) 116