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Annotation of sys/arch/hp300/stand/include/maskbits.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: maskbits.h,v 1.1 2006/08/05 09:58:57 miod 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 (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), "0" (*(char *) (pdst)))
        !            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 (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 (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:        switch (alu) {                                                  \
        !           101:        case RR_CLEAR:                                                  \
        !           102:        default:                                                        \
        !           103:                result = fnCLEAR(src, dst);                             \
        !           104:                break;                                                  \
        !           105:        case RR_COPY:                                                   \
        !           106:                result = fnCOPY(src, dst);                              \
        !           107:                break;                                                  \
        !           108:        case RR_XOR:                                                    \
        !           109:                result = fnXOR(src, dst);                               \
        !           110:                break;                                                  \
        !           111:        case RR_COPYINVERTED:                                           \
        !           112:                result = fnCOPYINVERTED(src, dst);                      \
        !           113:                break;                                                  \
        !           114:        }                                                               \
        !           115: } while (0)