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Linux kernel mirror (for testing)
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linux
1#ifndef __ASM_SH_CMPXCHG_CAS_H
2#define __ASM_SH_CMPXCHG_CAS_H
3
4static inline unsigned long
5__cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
6{
7 __asm__ __volatile__("cas.l %1,%0,@r0"
8 : "+r"(new)
9 : "r"(old), "z"(m)
10 : "t", "memory" );
11 return new;
12}
13
14static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
15{
16 unsigned long old;
17 do old = *m;
18 while (__cmpxchg_u32(m, old, val) != old);
19 return old;
20}
21
22#include <asm/cmpxchg-xchg.h>
23
24#endif /* __ASM_SH_CMPXCHG_CAS_H */