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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)