1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * This file and its contents are supplied under the terms of the
4 * Common Development and Distribution License ("CDDL"), version 1.0.
5 * You may only use this file in accordance with the terms of version
6 * 1.0 of the CDDL.
7 *
8 * A full copy of the text of the CDDL should have accompanied this
9 * source. A copy of the CDDL is also available via the Internet at
10 * https://opensource.org/license/CDDL-1.0.
11 */
12 /*
13 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
14 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
15 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
16 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
17 */
18
19 #ifndef _LIBSPL_SYS_SYSMACROS_H
20 #define _LIBSPL_SYS_SYSMACROS_H
21
22 #include <stdint.h>
23 #include <limits.h>
24
25 #ifdef __linux__
26 /*
27 * On Linux, we need the system-provided sysmacros.h to get the makedev(),
28 * major() and minor() definitions for makedevice() below. FreeBSD does not
29 * have this header, so include_next won't find it and will abort. So, we
30 * protect it with a platform check.
31 */
32 #ifndef IN_BASE
33 #include_next <sys/sysmacros.h>
34 #endif
35 #endif
36
37 #ifdef __FreeBSD__
38 #include <sys/param.h>
39 #endif
40
41 /* common macros */
42 #ifndef MIN
43 #define MIN(a, b) ((a) < (b) ? (a) : (b))
44 #endif
45 #ifndef MAX
46 #define MAX(a, b) ((a) < (b) ? (b) : (a))
47 #endif
48 #ifndef ABS
49 #define ABS(a) ((a) < 0 ? -(a) : (a))
50 #endif
51 #ifndef ARRAY_SIZE
52 #define ARRAY_SIZE(a) (sizeof (a) / sizeof (a[0]))
53 #endif
54 #ifndef DIV_ROUND_UP
55 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
56 #endif
57
58 #define makedevice(maj, min) makedev(maj, min)
59 #define _sysconf(a) sysconf(a)
60
61 /*
62 * Compatibility macros/typedefs needed for Solaris -> Linux port
63 */
64 // Deprecated. Use P2ALIGN_TYPED instead.
65 // #define P2ALIGN(x, align) ((x) & -(align))
66 #define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
67 #define P2ROUNDUP(x, align) ((((x) - 1) | ((align) - 1)) + 1)
68 #define P2BOUNDARY(off, len, align) \
69 (((off) ^ ((off) + (len) - 1)) > (align) - 1)
70 #define P2PHASE(x, align) ((x) & ((align) - 1))
71 #define P2NPHASE(x, align) (-(x) & ((align) - 1))
72 #define P2NPHASE_TYPED(x, align, type) \
73 (-(type)(x) & ((type)(align) - 1))
74 #define ISP2(x) (((x) & ((x) - 1)) == 0)
75 #define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
76
77 /*
78 * Typed version of the P2* macros. These macros should be used to ensure
79 * that the result is correctly calculated based on the data type of (x),
80 * which is passed in as the last argument, regardless of the data
81 * type of the alignment. For example, if (x) is of type uint64_t,
82 * and we want to round it up to a page boundary using "PAGESIZE" as
83 * the alignment, we can do either
84 * P2ROUNDUP(x, (uint64_t)PAGESIZE)
85 * or
86 * P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
87 */
88 #define P2ALIGN_TYPED(x, align, type) \
89 ((type)(x) & -(type)(align))
90 #define P2PHASE_TYPED(x, align, type) \
91 ((type)(x) & ((type)(align) - 1))
92 #define P2NPHASE_TYPED(x, align, type) \
93 (-(type)(x) & ((type)(align) - 1))
94 #define P2ROUNDUP_TYPED(x, align, type) \
95 ((((type)(x) - 1) | ((type)(align) - 1)) + 1)
96 #define P2END_TYPED(x, align, type) \
97 (-(~(type)(x) & -(type)(align)))
98 #define P2PHASEUP_TYPED(x, align, phase, type) \
99 ((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
100 #define P2CROSS_TYPED(x, y, align, type) \
101 (((type)(x) ^ (type)(y)) > (type)(align) - 1)
102 #define P2SAMEHIGHBIT_TYPED(x, y, type) \
103 (((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
104
105 #define max_ncpus 64
106 #define boot_ncpus (sysconf(_SC_NPROCESSORS_ONLN))
107
108 /*
109 * Process priorities as defined by setpriority(2) and getpriority(2).
110 */
111 #define minclsyspri 19
112 #define defclsyspri 0
113 /* Write issue taskq priority. */
114 #define wtqclsyspri -19
115 #define maxclsyspri -20
116
117 #define CPU_SEQID ((uintptr_t)pthread_self() & (max_ncpus - 1))
118 #define CPU_SEQID_UNSTABLE CPU_SEQID
119
120 /*
121 * Find highest one bit set.
122 * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
123 */
124 static inline int
highbit64(uint64_t i)125 highbit64(uint64_t i)
126 {
127 if (i == 0)
128 return (0);
129
130 return (CHAR_BIT * sizeof (uint64_t) - __builtin_clzll(i));
131 }
132
133 /*
134 * Find lowest one bit set.
135 * Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
136 * The __builtin_ffsll() function is supported by both GCC and Clang.
137 */
138 static inline int
lowbit64(uint64_t i)139 lowbit64(uint64_t i)
140 {
141 if (i == 0)
142 return (0);
143
144 return (__builtin_ffsll(i));
145 }
146
147 #endif /* _SYS_SYSMACROS_H */
148