4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
24 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
25 /* All Rights Reserved */
29 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
30 * Use is subject to license terms.
33 #ifndef _OPENSOLARIS_SYS_SYSMACROS_H_
34 #define _OPENSOLARIS_SYS_SYSMACROS_H_
36 #include <sys/param.h>
43 #define ABS(a) ((a) < 0 ? -(a) : (a))
47 * Macro for checking power of 2 address alignment.
49 #define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
52 * Macro to determine if value is a power of 2
54 #define ISP2(x) (((x) & ((x) - 1)) == 0)
57 * Macros for various sorts of alignment and rounding when the alignment
58 * is known to be a power of 2.
60 #define P2ALIGN(x, align) ((x) & -(align))
61 #define P2PHASE(x, align) ((x) & ((align) - 1))
62 #define P2NPHASE(x, align) (-(x) & ((align) - 1))
63 #define P2ROUNDUP(x, align) (-(-(x) & -(align)))
64 #define P2END(x, align) (-(~(x) & -(align)))
65 #define P2PHASEUP(x, align, phase) ((phase) - (((phase) - (x)) & -(align)))
66 #define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
68 * Determine whether two numbers have the same high-order bit.
70 #define P2SAMEHIGHBIT(x, y) (((x) ^ (y)) < ((x) & (y)))
73 * Typed version of the P2* macros. These macros should be used to ensure
74 * that the result is correctly calculated based on the data type of (x),
75 * which is passed in as the last argument, regardless of the data
76 * type of the alignment. For example, if (x) is of type uint64_t,
77 * and we want to round it up to a page boundary using "PAGESIZE" as
78 * the alignment, we can do either
79 * P2ROUNDUP(x, (uint64_t)PAGESIZE)
81 * P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
83 #define P2ALIGN_TYPED(x, align, type) \
84 ((type)(x) & -(type)(align))
85 #define P2PHASE_TYPED(x, align, type) \
86 ((type)(x) & ((type)(align) - 1))
87 #define P2NPHASE_TYPED(x, align, type) \
88 (-(type)(x) & ((type)(align) - 1))
89 #define P2ROUNDUP_TYPED(x, align, type) \
90 (-(-(type)(x) & -(type)(align)))
91 #define P2END_TYPED(x, align, type) \
92 (-(~(type)(x) & -(type)(align)))
93 #define P2PHASEUP_TYPED(x, align, phase, type) \
94 ((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
95 #define P2CROSS_TYPED(x, y, align, type) \
96 (((type)(x) ^ (type)(y)) > (type)(align) - 1)
97 #define P2SAMEHIGHBIT_TYPED(x, y, type) \
98 (((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
101 * Find highest one bit set.
102 * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
103 * High order bit is 31 (or 63 in _LP64 kernel).
113 if (i & 0xffffffff00000000ul) {
117 if (i & 0xffff0000) {
139 #endif /* _OPENSOLARIS_SYS_SYSMACROS_H_ */