1 /*
2 * CDDL HEADER START
3 *
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
7 * with the License.
8 *
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.
13 *
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]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
26 */
27
28 #ifndef _ASM_BITMAP_H
29 #define _ASM_BITMAP_H
30
31 #include <sys/ccompile.h>
32 #include <sys/types.h>
33
34 #ifdef __cplusplus
35 extern "C" {
36 #endif
37
38 #if !defined(__lint) && defined(__GNUC__)
39
40 #if defined(__amd64)
41 #define __SUF "q"
42 #elif defined(__i386)
43 #define __SUF "l"
44 #else
45 #error "port me"
46 #endif
47
48 extern __GNU_INLINE int
highbit(ulong_t i)49 highbit(ulong_t i)
50 {
51 long value;
52 uint8_t zf;
53
54 __asm__(
55 "bsr" __SUF " %2,%0;"
56 "setz %1"
57 : "=r" (value), "=q" (zf)
58 : "mr" (i)
59 : "cc");
60
61 return (zf ? 0 : (value + 1));
62 }
63
64 extern __GNU_INLINE int
lowbit(ulong_t i)65 lowbit(ulong_t i)
66 {
67 long value;
68 uint8_t zf;
69
70 __asm__(
71 "bsf" __SUF " %2,%0;"
72 "setz %1"
73 : "=r" (value), "=q" (zf)
74 : "mr" (i)
75 : "cc");
76
77 return (zf ? 0 : (value + 1));
78 }
79
80 extern __GNU_INLINE uint_t
atomic_btr32(uint32_t * memory,uint_t bitnum)81 atomic_btr32(uint32_t *memory, uint_t bitnum)
82 {
83 uint8_t value;
84
85 __asm__ __volatile__(
86 "lock;"
87 "btrl %2,%0;"
88 "setc %1"
89 : "+m" (*memory), "=r" (value)
90 : "ir" (bitnum)
91 : "cc");
92
93 return ((uint_t)value);
94 }
95
96 #undef __SUF
97
98 #endif /* !__lint && __GNUC__ */
99
100 #ifdef __cplusplus
101 }
102 #endif
103
104 #endif /* _ASM_BITMAP_H */
105