| 0,0 → 1,96 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __ia32_ATOMIC_H__ |
| #define __ia32_ATOMIC_H__ |
| |
| #include <arch/types.h> |
| |
| typedef volatile __u32 atomic_t; |
| |
| static inline void atomic_inc(atomic_t *val) { |
| #ifdef CONFIG_SMP |
| __asm__ volatile ("lock incl %0\n" : "=m" (*val)); |
| #else |
| __asm__ volatile ("incl %0\n" : "=m" (*val)); |
| #endif /* CONFIG_SMP */ |
| } |
| |
| static inline void atomic_dec(atomic_t *val) { |
| #ifdef CONFIG_SMP |
| __asm__ volatile ("lock decl %0\n" : "=m" (*val)); |
| #else |
| __asm__ volatile ("decl %0\n" : "=m" (*val)); |
| #endif /* CONFIG_SMP */ |
| } |
| |
| static inline atomic_t atomic_inc_pre(atomic_t *val) |
| { |
| atomic_t r; |
| __asm__ volatile ( |
| "movl $1,%0;" |
| "lock xaddl %0,%1;" |
| : "=r"(r), "=m" (*val) |
| ); |
| return r; |
| } |
| |
| |
| |
| static inline atomic_t atomic_dec_pre(atomic_t *val) |
| { |
| atomic_t r; |
| __asm__ volatile ( |
| "movl $-1,%0;" |
| "lock xaddl %0,%1;" |
| : "=r"(r), "=m" (*val) |
| ); |
| return r; |
| } |
| |
| #define atomic_inc_post(val) (atomic_inc_pre(val)+1) |
| #define atomic_dec_post(val) (atomic_dec_pre(val)-1) |
| |
| |
| |
| static inline int test_and_set(volatile int *val) { |
| int v; |
| |
| __asm__ volatile ( |
| "movl $1, %0\n" |
| "xchgl %0, %1\n" |
| : "=r" (v),"=m" (*val) |
| ); |
| |
| return v; |
| } |
| |
| |
| extern void spinlock_arch(volatile int *val); |
| |
| #endif |