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1 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
1 | 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 | |||
4345 | svoboda | 29 | /** @addtogroup ia32 |
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_ia32_ATOMIC_H_ |
36 | #define KERN_ia32_ATOMIC_H_ |
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1 | jermar | 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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1 | jermar | 41 | |
475 | jermar | 42 | static inline void atomic_inc(atomic_t *val) { |
458 | decky | 43 | #ifdef CONFIG_SMP |
4345 | svoboda | 44 | asm volatile ( |
45 | "lock incl %[count]\n" |
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46 | : [count] "+m" (val->count) |
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47 | ); |
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115 | jermar | 48 | #else |
4345 | svoboda | 49 | asm volatile ( |
50 | "incl %[count]\n" |
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51 | : [count] "+m" (val->count) |
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52 | ); |
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458 | decky | 53 | #endif /* CONFIG_SMP */ |
115 | jermar | 54 | } |
1 | jermar | 55 | |
475 | jermar | 56 | static inline void atomic_dec(atomic_t *val) { |
458 | decky | 57 | #ifdef CONFIG_SMP |
4345 | svoboda | 58 | asm volatile ( |
59 | "lock decl %[count]\n" |
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60 | : [count] "+m" (val->count) |
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61 | ); |
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115 | jermar | 62 | #else |
4345 | svoboda | 63 | asm volatile ( |
64 | "decl %[count]\n" |
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65 | : "+m" (val->count) |
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66 | ); |
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458 | decky | 67 | #endif /* CONFIG_SMP */ |
115 | jermar | 68 | } |
69 | |||
1104 | jermar | 70 | static inline long atomic_postinc(atomic_t *val) |
477 | vana | 71 | { |
1691 | palkovsky | 72 | long r = 1; |
4345 | svoboda | 73 | |
2082 | decky | 74 | asm volatile ( |
4345 | svoboda | 75 | "lock xaddl %[r], %[count]\n" |
76 | : [count] "+m" (val->count), [r] "+r" (r) |
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477 | vana | 77 | ); |
4345 | svoboda | 78 | |
477 | vana | 79 | return r; |
80 | } |
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81 | |||
1104 | jermar | 82 | static inline long atomic_postdec(atomic_t *val) |
477 | vana | 83 | { |
1691 | palkovsky | 84 | long r = -1; |
627 | jermar | 85 | |
2082 | decky | 86 | asm volatile ( |
4345 | svoboda | 87 | "lock xaddl %[r], %[count]\n" |
88 | : [count] "+m" (val->count), [r] "+r"(r) |
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477 | vana | 89 | ); |
627 | jermar | 90 | |
477 | vana | 91 | return r; |
92 | } |
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93 | |||
4345 | svoboda | 94 | #define atomic_preinc(val) (atomic_postinc(val) + 1) |
95 | #define atomic_predec(val) (atomic_postdec(val) - 1) |
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477 | vana | 96 | |
1780 | jermar | 97 | static inline uint32_t test_and_set(atomic_t *val) { |
98 | uint32_t v; |
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115 | jermar | 99 | |
2082 | decky | 100 | asm volatile ( |
4345 | svoboda | 101 | "movl $1, %[v]\n" |
102 | "xchgl %[v], %[count]\n" |
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103 | : [v] "=r" (v), [count] "+m" (val->count) |
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115 | jermar | 104 | ); |
105 | |||
106 | return v; |
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107 | } |
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108 | |||
1104 | jermar | 109 | /** ia32 specific fast spinlock */ |
1100 | palkovsky | 110 | static inline void atomic_lock_arch(atomic_t *val) |
111 | { |
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1780 | jermar | 112 | uint32_t tmp; |
4345 | svoboda | 113 | |
1100 | palkovsky | 114 | preemption_disable(); |
2082 | decky | 115 | asm volatile ( |
3191 | svoboda | 116 | "0:\n" |
1100 | palkovsky | 117 | #ifdef CONFIG_HT |
4345 | svoboda | 118 | "pause\n" /* Pentium 4's HT love this instruction */ |
1100 | palkovsky | 119 | #endif |
4345 | svoboda | 120 | "mov %[count], %[tmp]\n" |
121 | "testl %[tmp], %[tmp]\n" |
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3191 | svoboda | 122 | "jnz 0b\n" /* lightweight looping on locked spinlock */ |
1100 | palkovsky | 123 | |
4345 | svoboda | 124 | "incl %[tmp]\n" /* now use the atomic operation */ |
125 | "xchgl %[count], %[tmp]\n" |
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126 | "testl %[tmp], %[tmp]\n" |
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3191 | svoboda | 127 | "jnz 0b\n" |
4345 | svoboda | 128 | : [count] "+m" (val->count), [tmp] "=&r" (tmp) |
3191 | svoboda | 129 | ); |
1100 | palkovsky | 130 | /* |
131 | * Prevent critical section code from bleeding out this way up. |
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132 | */ |
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133 | CS_ENTER_BARRIER(); |
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134 | } |
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1 | jermar | 135 | |
136 | #endif |
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1702 | cejka | 137 | |
1888 | jermar | 138 | /** @} |
1702 | cejka | 139 | */ |