Annotation of sys/arch/hp300/dev/maskbits.h, Revision 1.1.1.1
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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