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| Rev | Author | Line No. | Line |
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| 112 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Jakub Jermar |
| 112 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1888 | jermar | 29 | /** @addtogroup ia64 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_ia64_ATOMIC_H_ |
| 36 | #define KERN_ia64_ATOMIC_H_ |
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| 112 | jermar | 37 | |
| 627 | jermar | 38 | /** Atomic addition. |
| 39 | * |
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| 4153 | mejdrech | 40 | * @param val Atomic value. |
| 41 | * @param imm Value to add. |
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| 627 | jermar | 42 | * |
| 4153 | mejdrech | 43 | * @return Value before addition. |
| 627 | jermar | 44 | */ |
| 1104 | jermar | 45 | static inline long atomic_add(atomic_t *val, int imm) |
| 475 | jermar | 46 | { |
| 1104 | jermar | 47 | long v; |
| 475 | jermar | 48 | |
| 4153 | mejdrech | 49 | asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), |
| 50 | "+m" (val->count) : "i" (imm)); |
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| 477 | vana | 51 | |
| 475 | jermar | 52 | return v; |
| 112 | jermar | 53 | } |
| 54 | |||
| 4718 | mejdrech | 55 | static inline uint64_t test_and_set(atomic_t *val) |
| 56 | { |
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| 4153 | mejdrech | 57 | uint64_t v; |
| 58 | |||
| 59 | asm volatile ( |
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| 4718 | mejdrech | 60 | "movl %0 = 0x1;;\n" |
| 4153 | mejdrech | 61 | "xchg8 %0 = %1, %0;;\n" |
| 62 | : "=r" (v), "+m" (val->count) |
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| 63 | ); |
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| 64 | |||
| 65 | return v; |
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| 66 | } |
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| 477 | vana | 67 | |
| 4718 | mejdrech | 68 | static inline void atomic_lock_arch(atomic_t *val) |
| 69 | { |
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| 70 | do { |
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| 71 | while (val->count) |
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| 72 | ; |
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| 73 | } while (test_and_set(val)); |
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| 74 | } |
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| 477 | vana | 75 | |
| 4153 | mejdrech | 76 | static inline void atomic_inc(atomic_t *val) |
| 77 | { |
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| 78 | atomic_add(val, 1); |
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| 79 | } |
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| 80 | |||
| 81 | static inline void atomic_dec(atomic_t *val) |
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| 82 | { |
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| 83 | atomic_add(val, -1); |
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| 84 | } |
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| 85 | |||
| 86 | static inline long atomic_preinc(atomic_t *val) |
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| 87 | { |
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| 88 | return atomic_add(val, 1) + 1; |
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| 89 | } |
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| 90 | |||
| 91 | static inline long atomic_predec(atomic_t *val) |
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| 92 | { |
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| 93 | return atomic_add(val, -1) - 1; |
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| 94 | } |
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| 95 | |||
| 96 | static inline long atomic_postinc(atomic_t *val) |
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| 97 | { |
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| 98 | return atomic_add(val, 1); |
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| 99 | } |
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| 100 | |||
| 101 | static inline long atomic_postdec(atomic_t *val) |
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| 102 | { |
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| 103 | return atomic_add(val, -1); |
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| 104 | } |
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| 105 | |||
| 112 | jermar | 106 | #endif |
| 1702 | cejka | 107 | |
| 1888 | jermar | 108 | /** @} |
| 1702 | cejka | 109 | */ |