1 1.10 tsutsui /* $NetBSD: maskbits.h,v 1.10 2025/05/31 18:50:33 tsutsui Exp $ */ 2 1.9 tsutsui /* $OpenBSD: maskbits.h,v 1.6 2006/08/05 09:58:56 miod Exp $ */ 3 1.9 tsutsui /* NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp */ 4 1.2 cgd 5 1.1 mycroft /*- 6 1.1 mycroft * Copyright (c) 1994 7 1.1 mycroft * The Regents of the University of California. All rights reserved. 8 1.1 mycroft * 9 1.1 mycroft * Redistribution and use in source and binary forms, with or without 10 1.1 mycroft * modification, are permitted provided that the following conditions 11 1.1 mycroft * are met: 12 1.1 mycroft * 1. Redistributions of source code must retain the above copyright 13 1.1 mycroft * notice, this list of conditions and the following disclaimer. 14 1.1 mycroft * 2. Redistributions in binary form must reproduce the above copyright 15 1.1 mycroft * notice, this list of conditions and the following disclaimer in the 16 1.1 mycroft * documentation and/or other materials provided with the distribution. 17 1.5 agc * 3. Neither the name of the University nor the names of its contributors 18 1.1 mycroft * may be used to endorse or promote products derived from this software 19 1.1 mycroft * without specific prior written permission. 20 1.1 mycroft * 21 1.1 mycroft * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.1 mycroft * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.1 mycroft * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.1 mycroft * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.1 mycroft * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.1 mycroft * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.1 mycroft * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.1 mycroft * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.1 mycroft * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.1 mycroft * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.1 mycroft * SUCH DAMAGE. 32 1.1 mycroft * 33 1.2 cgd * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 34 1.1 mycroft */ 35 1.1 mycroft 36 1.1 mycroft /* 37 1.1 mycroft * Derived from X11R4 38 1.1 mycroft */ 39 1.1 mycroft 40 1.1 mycroft /* the following notes use the following conventions: 41 1.10 tsutsui * SCREEN LEFT SCREEN RIGHT 42 1.10 tsutsui * in this file and maskbits.c, left and right refer to screen coordinates, 43 1.10 tsutsui * NOT bit numbering in registers. 44 1.10 tsutsui * 45 1.10 tsutsui * rasops_lmask[n] 46 1.10 tsutsui * bits[0,n-1] = 0 bits[n,31] = 1 47 1.10 tsutsui * rasops_rmask[n] = 48 1.10 tsutsui * bits[0,n-1] = 1 bits[n,31] = 0 49 1.10 tsutsui * 50 1.10 tsutsui * maskbits(x, w, startmask, endmask, nlw) 51 1.10 tsutsui * for a span of width w starting at position x, returns 52 1.10 tsutsui * a mask for ragged bits at start, mask for ragged bits at end, 53 1.10 tsutsui * and the number of whole longwords between the ends. 54 1.10 tsutsui * 55 1.10 tsutsui */ 56 1.1 mycroft 57 1.8 tsutsui #define maskbits(x, w, startmask, endmask, nlw) \ 58 1.8 tsutsui do { \ 59 1.9 tsutsui startmask = rasops_lmask[(x) & 0x1f]; \ 60 1.9 tsutsui endmask = rasops_rmask[((x) + (w)) & 0x1f]; \ 61 1.8 tsutsui if (startmask) \ 62 1.9 tsutsui nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \ 63 1.8 tsutsui else \ 64 1.8 tsutsui nlw = (w) >> 5; \ 65 1.8 tsutsui } while (/* CONSTCOND */ 0) 66 1.8 tsutsui 67 1.8 tsutsui #define FASTGETBITS(psrc, x, w, dst) \ 68 1.9 tsutsui asm ("bfextu %3{%1:%2},%0" \ 69 1.10 tsutsui : "=d" (dst) : "di" (x), "di" (w), "o" (*(uint8_t *)(psrc))) 70 1.8 tsutsui 71 1.8 tsutsui #define FASTPUTBITS(src, x, w, pdst) \ 72 1.9 tsutsui asm ("bfins %3,%0{%1:%2}" \ 73 1.10 tsutsui : "=o" (*(uint8_t *)(pdst)) \ 74 1.9 tsutsui : "di" (x), "di" (w), "d" (src)) 75 1.8 tsutsui 76 1.8 tsutsui #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 77 1.8 tsutsui do { \ 78 1.10 tsutsui uint32_t _tmpdst; \ 79 1.9 tsutsui if (rop == RR_CLEAR) \ 80 1.9 tsutsui _tmpdst = 0; \ 81 1.9 tsutsui else \ 82 1.9 tsutsui FASTGETBITS(psrc, srcbit, width, _tmpdst); \ 83 1.8 tsutsui FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 84 1.8 tsutsui } while (/* CONSTCOND */ 0) 85 1.1 mycroft 86 1.8 tsutsui #define getunalignedword(psrc, x, dst) \ 87 1.8 tsutsui do { \ 88 1.10 tsutsui uint32_t _tmp; \ 89 1.9 tsutsui FASTGETBITS(psrc, x, 32, _tmp); \ 90 1.9 tsutsui dst = _tmp; \ 91 1.8 tsutsui } while (/* CONSTCOND */ 0) 92
Indexes created Sat Sep 20 22:09:52 GMT 2025