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| Rev | Author | Line No. | Line |
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| 633 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2001-2004 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 | |||
| 1702 | cejka | 29 | /** @addtogroup amd64 |
| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 633 | palkovsky | 35 | #ifndef __amd64_ATOMIC_H__ |
| 36 | #define __amd64_ATOMIC_H__ |
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| 37 | |||
| 38 | #include <arch/types.h> |
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| 1100 | palkovsky | 39 | #include <arch/barrier.h> |
| 40 | #include <preemption.h> |
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| 1104 | jermar | 41 | #include <typedefs.h> |
| 633 | palkovsky | 42 | |
| 43 | static inline void atomic_inc(atomic_t *val) { |
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| 44 | #ifdef CONFIG_SMP |
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| 45 | __asm__ volatile ("lock incq %0\n" : "=m" (val->count)); |
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| 46 | #else |
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| 47 | __asm__ volatile ("incq %0\n" : "=m" (val->count)); |
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| 48 | #endif /* CONFIG_SMP */ |
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| 49 | } |
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| 50 | |||
| 51 | static inline void atomic_dec(atomic_t *val) { |
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| 52 | #ifdef CONFIG_SMP |
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| 53 | __asm__ volatile ("lock decq %0\n" : "=m" (val->count)); |
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| 54 | #else |
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| 55 | __asm__ volatile ("decq %0\n" : "=m" (val->count)); |
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| 56 | #endif /* CONFIG_SMP */ |
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| 57 | } |
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| 58 | |||
| 1104 | jermar | 59 | static inline long atomic_postinc(atomic_t *val) |
| 633 | palkovsky | 60 | { |
| 1692 | palkovsky | 61 | long r = 1; |
| 633 | palkovsky | 62 | |
| 63 | __asm__ volatile ( |
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| 1692 | palkovsky | 64 | "lock xaddq %1, %0\n" |
| 1697 | palkovsky | 65 | : "=m" (val->count), "+r" (r) |
| 633 | palkovsky | 66 | ); |
| 67 | |||
| 68 | return r; |
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| 69 | } |
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| 70 | |||
| 1104 | jermar | 71 | static inline long atomic_postdec(atomic_t *val) |
| 633 | palkovsky | 72 | { |
| 1692 | palkovsky | 73 | long r = -1; |
| 633 | palkovsky | 74 | |
| 75 | __asm__ volatile ( |
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| 1692 | palkovsky | 76 | "lock xaddq %1, %0\n" |
| 1697 | palkovsky | 77 | : "=m" (val->count), "+r" (r) |
| 633 | palkovsky | 78 | ); |
| 79 | |||
| 80 | return r; |
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| 81 | } |
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| 82 | |||
| 1024 | jermar | 83 | #define atomic_preinc(val) (atomic_postinc(val)+1) |
| 84 | #define atomic_predec(val) (atomic_postdec(val)-1) |
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| 633 | palkovsky | 85 | |
| 86 | static inline __u64 test_and_set(atomic_t *val) { |
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| 87 | __u64 v; |
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| 88 | |||
| 89 | __asm__ volatile ( |
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| 90 | "movq $1, %0\n" |
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| 91 | "xchgq %0, %1\n" |
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| 92 | : "=r" (v),"=m" (val->count) |
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| 93 | ); |
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| 94 | |||
| 95 | return v; |
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| 96 | } |
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| 97 | |||
| 98 | |||
| 1104 | jermar | 99 | /** amd64 specific fast spinlock */ |
| 1100 | palkovsky | 100 | static inline void atomic_lock_arch(atomic_t *val) |
| 101 | { |
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| 102 | __u64 tmp; |
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| 633 | palkovsky | 103 | |
| 1100 | palkovsky | 104 | preemption_disable(); |
| 105 | __asm__ volatile ( |
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| 106 | "0:;" |
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| 107 | #ifdef CONFIG_HT |
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| 1121 | jermar | 108 | "pause;" |
| 633 | palkovsky | 109 | #endif |
| 1100 | palkovsky | 110 | "mov %0, %1;" |
| 111 | "testq %1, %1;" |
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| 1104 | jermar | 112 | "jnz 0b;" /* Lightweight looping on locked spinlock */ |
| 1100 | palkovsky | 113 | |
| 114 | "incq %1;" /* now use the atomic operation */ |
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| 115 | "xchgq %0, %1;" |
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| 116 | "testq %1, %1;" |
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| 117 | "jnz 0b;" |
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| 118 | : "=m"(val->count),"=r"(tmp) |
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| 119 | ); |
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| 120 | /* |
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| 121 | * Prevent critical section code from bleeding out this way up. |
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| 122 | */ |
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| 123 | CS_ENTER_BARRIER(); |
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| 124 | } |
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| 125 | |||
| 126 | #endif |
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| 1702 | cejka | 127 | |
| 128 | /** @} |
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| 129 | */ |
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| 130 |