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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 | |||
1888 | jermar | 29 | /** @addtogroup amd64 |
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_amd64_ATOMIC_H_ |
36 | #define KERN_amd64_ATOMIC_H_ |
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633 | palkovsky | 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 | |
1780 | jermar | 86 | static inline uint64_t test_and_set(atomic_t *val) { |
87 | uint64_t v; |
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633 | palkovsky | 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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1780 | jermar | 102 | uint64_t tmp; |
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 | |
1888 | jermar | 128 | /** @} |
1702 | cejka | 129 | */ |