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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 | /* |
37 | * |
37 | * TODO: these are just placeholders for real implementations of atomic_inc and atomic_dec. |
38 | * Use atomic compare and swap operation to atomically add signed value. |
- | 39 | * |
|
- | 40 | * @param val Atomic variable. |
|
- | 41 | * @param i Signed value to be added. |
|
- | 42 | * |
|
38 | * WARNING: the following functions cause the code to be preemption-unsafe !!! |
43 | * @return Value of the atomic variable as it existed before addition. |
39 | */ |
44 | */ |
- | 45 | static inline count_t atomic_add(atomic_t *val, int i) |
|
- | 46 | { |
|
- | 47 | __u64 a, b; |
|
- | 48 | volatile __u64 x = (__u64) &val->count; |
|
- | 49 | ||
- | 50 | __asm__ volatile ( |
|
- | 51 | "0:\n" |
|
- | 52 | "ldx %0, %1\n" |
|
- | 53 | "add %1, %3, %2\n" |
|
- | 54 | "casx %0, %1, %2\n" |
|
- | 55 | "cmp %1, %2\n" |
|
- | 56 | "bne 0b\n" |
|
- | 57 | "nop\n" |
|
- | 58 | : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b) |
|
- | 59 | : "r" (i) |
|
- | 60 | ); |
|
- | 61 | ||
- | 62 | return a; |
|
- | 63 | } |
|
40 | 64 | ||
41 | static inline void atomic_inc(atomic_t *val) |
65 | static inline void atomic_inc(atomic_t *val) |
42 | { |
66 | { |
43 | val->count++; |
67 | (void) atomic_add(val, 1); |
44 | } |
68 | } |
45 | 69 | ||
46 | static inline void atomic_dec(atomic_t *val) |
70 | static inline void atomic_dec(atomic_t *val) |
47 | { |
71 | { |
48 | val->count--; |
72 | (void) atomic_add(val, -1); |
49 | } |
73 | } |
50 | 74 | ||
51 | static inline void atomic_set(atomic_t *val, __u64 i) |
75 | static inline void atomic_set(atomic_t *val, __u64 i) |
52 | { |
76 | { |
53 | val->count = i; |
77 | val->count = i; |
54 | } |
78 | } |
55 | 79 | ||
56 | static inline __u64 atomic_get(atomic_t *val) |
80 | static inline __u64 atomic_get(atomic_t *val) |
57 | { |
81 | { |
58 | return val->count; |
82 | return val->count; |
59 | } |
83 | } |
60 | 84 | ||
61 | #endif |
85 | #endif |
62 | 86 |