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| Rev | Author | Line No. | Line |
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| 418 | jermar | 1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __sparc64_ATOMIC_H__ |
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| 30 | #define __sparc64_ATOMIC_H__ |
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| 31 | |||
| 475 | jermar | 32 | #include <arch/types.h> |
| 33 | |||
| 625 | palkovsky | 34 | typedef struct { volatile __u64 count; } atomic_t; |
| 475 | jermar | 35 | |
| 861 | jermar | 36 | /** Atomic add operation. |
| 37 | * |
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| 38 | * Use atomic compare and swap operation to atomically add signed value. |
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| 39 | * |
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| 40 | * @param val Atomic variable. |
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| 41 | * @param i Signed value to be added. |
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| 42 | * |
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| 43 | * @return Value of the atomic variable as it existed before addition. |
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| 418 | jermar | 44 | */ |
| 861 | jermar | 45 | static inline count_t atomic_add(atomic_t *val, int i) |
| 46 | { |
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| 47 | __u64 a, b; |
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| 48 | volatile __u64 x = (__u64) &val->count; |
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| 418 | jermar | 49 | |
| 861 | jermar | 50 | __asm__ volatile ( |
| 51 | "0:\n" |
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| 52 | "ldx %0, %1\n" |
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| 53 | "add %1, %3, %2\n" |
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| 54 | "casx %0, %1, %2\n" |
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| 55 | "cmp %1, %2\n" |
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| 863 | jermar | 56 | "bne 0b\n" /* The operation failed and must be attempted again if a != b. */ |
| 861 | jermar | 57 | "nop\n" |
| 58 | : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b) |
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| 59 | : "r" (i) |
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| 60 | ); |
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| 61 | |||
| 62 | return a; |
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| 63 | } |
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| 64 | |||
| 627 | jermar | 65 | static inline void atomic_inc(atomic_t *val) |
| 66 | { |
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| 861 | jermar | 67 | (void) atomic_add(val, 1); |
| 418 | jermar | 68 | } |
| 69 | |||
| 627 | jermar | 70 | static inline void atomic_dec(atomic_t *val) |
| 71 | { |
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| 861 | jermar | 72 | (void) atomic_add(val, -1); |
| 418 | jermar | 73 | } |
| 74 | |||
| 627 | jermar | 75 | static inline void atomic_set(atomic_t *val, __u64 i) |
| 76 | { |
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| 77 | val->count = i; |
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| 78 | } |
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| 79 | |||
| 80 | static inline __u64 atomic_get(atomic_t *val) |
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| 81 | { |
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| 82 | return val->count; |
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| 83 | } |
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| 84 | |||
| 418 | jermar | 85 | #endif |