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]
23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 #ifndef _LIBSPL_SYS_SYSMACROS_H
28 #define _LIBSPL_SYS_SYSMACROS_H
30 #include_next <sys/sysmacros.h>
34 #define MIN(a, b) ((a) < (b) ? (a) : (b))
37 #define MAX(a, b) ((a) < (b) ? (b) : (a))
40 #define ABS(a) ((a) < 0 ? -(a) : (a))
43 #define ARRAY_SIZE(a) (sizeof (a) / sizeof (a[0]))
46 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
49 #define makedevice(maj, min) makedev(maj, min)
50 #define _sysconf(a) sysconf(a)
53 * Compatibility macros/typedefs needed for Solaris -> Linux port
55 #define P2ALIGN(x, align) ((x) & -(align))
56 #define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
57 #define P2ROUNDUP(x, align) ((((x) - 1) | ((align) - 1)) + 1)
58 #define P2BOUNDARY(off, len, align) \
59 (((off) ^ ((off) + (len) - 1)) > (align) - 1)
60 #define P2PHASE(x, align) ((x) & ((align) - 1))
61 #define P2NPHASE(x, align) (-(x) & ((align) - 1))
62 #define P2NPHASE_TYPED(x, align, type) \
63 (-(type)(x) & ((type)(align) - 1))
64 #define ISP2(x) (((x) & ((x) - 1)) == 0)
65 #define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
68 * Typed version of the P2* macros. These macros should be used to ensure
69 * that the result is correctly calculated based on the data type of (x),
70 * which is passed in as the last argument, regardless of the data
71 * type of the alignment. For example, if (x) is of type uint64_t,
72 * and we want to round it up to a page boundary using "PAGESIZE" as
73 * the alignment, we can do either
74 * P2ROUNDUP(x, (uint64_t)PAGESIZE)
76 * P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
78 #define P2ALIGN_TYPED(x, align, type) \
79 ((type)(x) & -(type)(align))
80 #define P2PHASE_TYPED(x, align, type) \
81 ((type)(x) & ((type)(align) - 1))
82 #define P2NPHASE_TYPED(x, align, type) \
83 (-(type)(x) & ((type)(align) - 1))
84 #define P2ROUNDUP_TYPED(x, align, type) \
85 ((((type)(x) - 1) | ((type)(align) - 1)) + 1)
86 #define P2END_TYPED(x, align, type) \
87 (-(~(type)(x) & -(type)(align)))
88 #define P2PHASEUP_TYPED(x, align, phase, type) \
89 ((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
90 #define P2CROSS_TYPED(x, y, align, type) \
91 (((type)(x) ^ (type)(y)) > (type)(align) - 1)
92 #define P2SAMEHIGHBIT_TYPED(x, y, type) \
93 (((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
96 /* avoid any possibility of clashing with <stddef.h> version */
97 #if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
98 #define offsetof(s, m) ((size_t)(&(((s *)0)->m)))
103 #endif /* _LIBSPL_SYS_SYSMACROS_H */