7 * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 #include <lttng/bug.h>
33 #include <machine/param.h>
37 #define LTTNG_UST_PAGE_SIZE sysconf(_SC_PAGE_SIZE)
38 #elif defined(PAGE_SIZE)
39 #define LTTNG_UST_PAGE_SIZE PAGE_SIZE
41 #error "Please add page size detection for your OS."
44 #define LTTNG_UST_PAGE_MASK (~(LTTNG_UST_PAGE_SIZE - 1))
46 #define __LTTNG_UST_ALIGN_MASK(v, mask) (((v) + (mask)) & ~(mask))
47 #define LTTNG_UST_ALIGN(v, align) __LTTNG_UST_ALIGN_MASK(v, (__typeof__(v)) (align) - 1)
48 #define LTTNG_UST_PAGE_ALIGN(addr) LTTNG_UST_ALIGN(addr, LTTNG_UST_PAGE_SIZE)
51 * lttng_ust_offset_align - Calculate the offset needed to align an object on
52 * its natural alignment towards higher addresses.
53 * @align_drift: object offset from an "alignment"-aligned address.
54 * @alignment: natural object alignment. Must be non-zero, power of 2.
56 * Returns the offset that must be added to align towards higher
59 #define lttng_ust_offset_align(align_drift, alignment) \
61 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
62 || ((alignment) & ((alignment) - 1))); \
63 (((alignment) - (align_drift)) & ((alignment) - 1)); \
67 * lttng_ust_offset_align_floor - Calculate the offset needed to align an
68 * object on its natural alignment towards lower addresses.
69 * @align_drift: object offset from an "alignment"-aligned address.
70 * @alignment: natural object alignment. Must be non-zero, power of 2.
72 * Returns the offset that must be substracted to align towards lower addresses.
74 #define lttng_ust_offset_align_floor(align_drift, alignment) \
76 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
77 || ((alignment) & ((alignment) - 1))); \
78 (((align_drift) - (alignment)) & ((alignment) - 1)); \
82 * Non-namespaced defines for backwards compatibility,
83 * introduced in 2.13, should be removed in the future.
86 /* Cygwin limits.h defines its own PAGE_SIZE */
88 #define PAGE_SIZE LTTNG_UST_PAGE_SIZE
91 /* FreeBSD and macOS defines their own PAGE_MASK. */
93 #define PAGE_MASK LTTNG_UST_PAGE_MASK
96 /* FreeBSD machine/param.h defines its own ALIGN */
98 #define ALIGN LTTNG_UST_ALIGN
102 #define PAGE_ALIGN LTTNG_UST_PAGE_ALIGN
106 #define offset_align lttng_ust_offset_align
109 #ifndef offset_align_floor
110 #define offset_align_floor lttng_ust_offset_align_floor
113 #endif /* _UST_ALIGN_H */
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