Annotation of sys/arch/hp300/dev/maskbits.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: maskbits.h,v 1.6 2006/08/05 09:58:56 miod Exp $ */
! 2: /* $NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1994
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)maskbits.h 8.2 (Berkeley) 3/21/94
! 33: */
! 34:
! 35: /*
! 36: * Derived from X11R4
! 37: */
! 38:
! 39: /* the following notes use the following conventions:
! 40: SCREEN LEFT SCREEN RIGHT
! 41: in this file and maskbits.c, left and right refer to screen coordinates,
! 42: NOT bit numbering in registers.
! 43:
! 44: rasops_lmask[n]
! 45: bits[0,n-1] = 0 bits[n,31] = 1
! 46: rasops_rmask[n] =
! 47: bits[0,n-1] = 1 bits[n,31] = 0
! 48:
! 49: maskbits(x, w, startmask, endmask, nlw)
! 50: for a span of width w starting at position x, returns
! 51: a mask for ragged bits at start, mask for ragged bits at end,
! 52: and the number of whole longwords between the ends.
! 53:
! 54: */
! 55:
! 56: #define maskbits(x, w, startmask, endmask, nlw) \
! 57: do { \
! 58: startmask = rasops_lmask[(x) & 0x1f]; \
! 59: endmask = rasops_rmask[((x) + (w)) & 0x1f]; \
! 60: if (startmask) \
! 61: nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \
! 62: else \
! 63: nlw = (w) >> 5; \
! 64: } while (0)
! 65:
! 66: #define FASTGETBITS(psrc, x, w, dst) \
! 67: asm ("bfextu %3{%1:%2},%0" \
! 68: : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc)))
! 69:
! 70: #define FASTPUTBITS(src, x, w, pdst) \
! 71: asm ("bfins %3,%0{%1:%2}" \
! 72: : "=o" (*(char *)(pdst)) \
! 73: : "di" (x), "di" (w), "d" (src), "0" (*(char *) (pdst)))
! 74:
! 75: #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
! 76: do { \
! 77: unsigned int _tmpdst; \
! 78: if (rop == RR_CLEAR) \
! 79: _tmpdst = 0; \
! 80: else \
! 81: FASTGETBITS(psrc, srcbit, width, _tmpdst); \
! 82: FASTPUTBITS(_tmpdst, dstbit, width, pdst); \
! 83: } while (0)
! 84:
! 85: #define getunalignedword(psrc, x, dst) \
! 86: do { \
! 87: int _tmp; \
! 88: FASTGETBITS(psrc, x, 32, _tmp); \
! 89: dst = _tmp; \
! 90: } while (0)
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