Rev 861 | Rev 1024 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 861 | Rev 863 | ||
---|---|---|---|
1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __sparc64_ATOMIC_H__ |
29 | #ifndef __sparc64_ATOMIC_H__ |
30 | #define __sparc64_ATOMIC_H__ |
30 | #define __sparc64_ATOMIC_H__ |
31 | 31 | ||
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | 33 | ||
34 | typedef struct { volatile __u64 count; } atomic_t; |
34 | typedef struct { volatile __u64 count; } atomic_t; |
35 | 35 | ||
36 | /** Atomic add operation. |
36 | /** Atomic add operation. |
37 | * |
37 | * |
38 | * Use atomic compare and swap operation to atomically add signed value. |
38 | * Use atomic compare and swap operation to atomically add signed value. |
39 | * |
39 | * |
40 | * @param val Atomic variable. |
40 | * @param val Atomic variable. |
41 | * @param i Signed value to be added. |
41 | * @param i Signed value to be added. |
42 | * |
42 | * |
43 | * @return Value of the atomic variable as it existed before addition. |
43 | * @return Value of the atomic variable as it existed before addition. |
44 | */ |
44 | */ |
45 | static inline count_t atomic_add(atomic_t *val, int i) |
45 | static inline count_t atomic_add(atomic_t *val, int i) |
46 | { |
46 | { |
47 | __u64 a, b; |
47 | __u64 a, b; |
48 | volatile __u64 x = (__u64) &val->count; |
48 | volatile __u64 x = (__u64) &val->count; |
49 | 49 | ||
50 | __asm__ volatile ( |
50 | __asm__ volatile ( |
51 | "0:\n" |
51 | "0:\n" |
52 | "ldx %0, %1\n" |
52 | "ldx %0, %1\n" |
53 | "add %1, %3, %2\n" |
53 | "add %1, %3, %2\n" |
54 | "casx %0, %1, %2\n" |
54 | "casx %0, %1, %2\n" |
55 | "cmp %1, %2\n" |
55 | "cmp %1, %2\n" |
56 | "bne 0b\n" |
56 | "bne 0b\n" /* The operation failed and must be attempted again if a != b. */ |
57 | "nop\n" |
57 | "nop\n" |
58 | : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b) |
58 | : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b) |
59 | : "r" (i) |
59 | : "r" (i) |
60 | ); |
60 | ); |
61 | 61 | ||
62 | return a; |
62 | return a; |
63 | } |
63 | } |
64 | 64 | ||
65 | static inline void atomic_inc(atomic_t *val) |
65 | static inline void atomic_inc(atomic_t *val) |
66 | { |
66 | { |
67 | (void) atomic_add(val, 1); |
67 | (void) atomic_add(val, 1); |
68 | } |
68 | } |
69 | 69 | ||
70 | static inline void atomic_dec(atomic_t *val) |
70 | static inline void atomic_dec(atomic_t *val) |
71 | { |
71 | { |
72 | (void) atomic_add(val, -1); |
72 | (void) atomic_add(val, -1); |
73 | } |
73 | } |
74 | 74 | ||
75 | static inline void atomic_set(atomic_t *val, __u64 i) |
75 | static inline void atomic_set(atomic_t *val, __u64 i) |
76 | { |
76 | { |
77 | val->count = i; |
77 | val->count = i; |
78 | } |
78 | } |
79 | 79 | ||
80 | static inline __u64 atomic_get(atomic_t *val) |
80 | static inline __u64 atomic_get(atomic_t *val) |
81 | { |
81 | { |
82 | return val->count; |
82 | return val->count; |
83 | } |
83 | } |
84 | 84 | ||
85 | #endif |
85 | #endif |
86 | 86 |