Rev 475 | Rev 481 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 11 | jermar | 29 | #ifndef __ia32_ATOMIC_H__ |
| 30 | #define __ia32_ATOMIC_H__ |
||
| 1 | jermar | 31 | |
| 32 | #include <arch/types.h> |
||
| 33 | |||
| 475 | jermar | 34 | typedef volatile __u32 atomic_t; |
| 35 | |||
| 36 | static inline void atomic_inc(atomic_t *val) { |
||
| 458 | decky | 37 | #ifdef CONFIG_SMP |
| 477 | vana | 38 | __asm__ volatile ("lock incl %0\n" : "+m" (*val)); |
| 115 | jermar | 39 | #else |
| 477 | vana | 40 | __asm__ volatile ("incl %0\n" : "+m" (*val)); |
| 458 | decky | 41 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 42 | } |
| 1 | jermar | 43 | |
| 475 | jermar | 44 | static inline void atomic_dec(atomic_t *val) { |
| 458 | decky | 45 | #ifdef CONFIG_SMP |
| 477 | vana | 46 | __asm__ volatile ("lock decl %0\n" : "+m" (*val)); |
| 115 | jermar | 47 | #else |
| 477 | vana | 48 | __asm__ volatile ("decl %0\n" : "+m" (*val)); |
| 458 | decky | 49 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 50 | } |
| 51 | |||
| 477 | vana | 52 | static inline atomic_t atomic_inc_pre(atomic_t *val) |
| 53 | { |
||
| 54 | atomic_t r; |
||
| 55 | __asm__ volatile ( |
||
| 56 | "movl $1,%0;" |
||
| 57 | "lock xaddl %0,%1;" |
||
| 58 | : "=r"(r), "+m" (*val) |
||
| 59 | ); |
||
| 60 | return r; |
||
| 61 | } |
||
| 62 | |||
| 63 | |||
| 64 | |||
| 65 | static inline atomic_t atomic_dec_pre(atomic_t *val) |
||
| 66 | { |
||
| 67 | atomic_t r; |
||
| 68 | __asm__ volatile ( |
||
| 69 | "movl $-1,%0;" |
||
| 70 | "lock xaddl %0,%1;" |
||
| 71 | : "=r"(r), "+m" (*val) |
||
| 72 | ); |
||
| 73 | return r; |
||
| 74 | } |
||
| 75 | |||
| 76 | #define atomic_inc_post(val) (atomic_inc_pre(val)+1) |
||
| 77 | #define atomic_dec_post(val) (atomic_dec_pre(val)-1) |
||
| 78 | |||
| 79 | |||
| 80 | |||
| 116 | jermar | 81 | static inline int test_and_set(volatile int *val) { |
| 115 | jermar | 82 | int v; |
| 83 | |||
| 84 | __asm__ volatile ( |
||
| 85 | "movl $1, %0\n" |
||
| 259 | palkovsky | 86 | "xchgl %0, %1\n" |
| 477 | vana | 87 | : "=r" (v),"+m" (*val) |
| 115 | jermar | 88 | ); |
| 89 | |||
| 90 | return v; |
||
| 91 | } |
||
| 92 | |||
| 93 | |||
| 116 | jermar | 94 | extern void spinlock_arch(volatile int *val); |
| 1 | jermar | 95 | |
| 96 | #endif |