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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 | |||
1024 | jermar | 65 | static inline count_t atomic_preinc(atomic_t *val) |
66 | { |
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67 | return atomic_add(val, 1) + 1; |
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68 | } |
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69 | |||
70 | static inline count_t atomic_postinc(atomic_t *val) |
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71 | { |
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72 | return atomic_add(val, 1); |
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73 | } |
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74 | |||
75 | static inline count_t atomic_predec(atomic_t *val) |
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76 | { |
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77 | return atomic_add(val, -1) - 1; |
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78 | } |
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79 | |||
80 | static inline count_t atomic_postdec(atomic_t *val) |
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81 | { |
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82 | return atomic_add(val, 1); |
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83 | } |
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84 | |||
627 | jermar | 85 | static inline void atomic_inc(atomic_t *val) |
86 | { |
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861 | jermar | 87 | (void) atomic_add(val, 1); |
418 | jermar | 88 | } |
89 | |||
627 | jermar | 90 | static inline void atomic_dec(atomic_t *val) |
91 | { |
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861 | jermar | 92 | (void) atomic_add(val, -1); |
418 | jermar | 93 | } |
94 | |||
627 | jermar | 95 | static inline void atomic_set(atomic_t *val, __u64 i) |
96 | { |
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97 | val->count = i; |
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98 | } |
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99 | |||
100 | static inline __u64 atomic_get(atomic_t *val) |
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101 | { |
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102 | return val->count; |
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103 | } |
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104 | |||
418 | jermar | 105 | #endif |