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153 | 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 | |||
1702 | cejka | 29 | /** @addtogroup ia32 |
30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
153 | jermar | 35 | #ifndef __ia32_BARRIER_H__ |
36 | #define __ia32_BARRIER_H__ |
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37 | |||
38 | /* |
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39 | * NOTE: |
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40 | * No barriers for critical section (i.e. spinlock) on IA-32 are needed: |
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41 | * - spinlock_lock() and spinlock_trylock() use serializing XCHG instruction |
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42 | * - writes cannot pass reads on IA-32 => spinlock_unlock() needs no barriers |
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43 | */ |
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44 | |||
45 | /* |
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46 | * Provisions are made to prevent compiler from reordering instructions itself. |
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47 | */ |
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48 | |||
49 | #define CS_ENTER_BARRIER() __asm__ volatile ("" ::: "memory") |
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50 | #define CS_LEAVE_BARRIER() __asm__ volatile ("" ::: "memory") |
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51 | |||
469 | jermar | 52 | static inline void cpuid_serialization(void) |
53 | { |
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54 | __asm__ volatile ( |
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55 | "xorl %%eax, %%eax\n" |
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56 | "cpuid\n" |
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57 | ::: "eax", "ebx", "ecx", "edx", "memory" |
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58 | ); |
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59 | } |
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60 | |||
468 | decky | 61 | #ifdef CONFIG_FENCES_P4 |
470 | jermar | 62 | # define memory_barrier() __asm__ volatile ("mfence\n" ::: "memory") |
468 | decky | 63 | # define read_barrier() __asm__ volatile ("lfence\n" ::: "memory") |
470 | jermar | 64 | # ifdef CONFIG_WEAK_MEMORY |
65 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
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66 | # else |
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1434 | palkovsky | 67 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
470 | jermar | 68 | # endif |
468 | decky | 69 | #elif CONFIG_FENCES_P3 |
469 | jermar | 70 | # define memory_barrier() cpuid_serialization() |
71 | # define read_barrier() cpuid_serialization() |
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470 | jermar | 72 | # ifdef CONFIG_WEAK_MEMORY |
73 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
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74 | # else |
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1434 | palkovsky | 75 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
470 | jermar | 76 | # endif |
469 | jermar | 77 | #else |
78 | # define memory_barrier() cpuid_serialization() |
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79 | # define read_barrier() cpuid_serialization() |
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470 | jermar | 80 | # ifdef CONFIG_WEAK_MEMORY |
81 | # define write_barrier() cpuid_serialization() |
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82 | # else |
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1434 | palkovsky | 83 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
470 | jermar | 84 | # endif |
153 | jermar | 85 | #endif |
423 | decky | 86 | |
87 | #endif |
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1702 | cejka | 88 | |
89 | /** @} |
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90 | */ |
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91 |