diff options
Diffstat (limited to 'arch/sh/include/asm/cmpxchg-cas.h')
| -rw-r--r-- | arch/sh/include/asm/cmpxchg-cas.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/sh/include/asm/cmpxchg-cas.h b/arch/sh/include/asm/cmpxchg-cas.h new file mode 100644 index 0000000000..f508db6eaf --- /dev/null +++ b/arch/sh/include/asm/cmpxchg-cas.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_CMPXCHG_CAS_H +#define __ASM_SH_CMPXCHG_CAS_H + +static inline unsigned long +__cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new) +{ + __asm__ __volatile__("cas.l %1,%0,@r0" + : "+r"(new) + : "r"(old), "z"(m) + : "t", "memory" ); + return new; +} + +static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) +{ + unsigned long old; + do old = *m; + while (__cmpxchg_u32(m, old, val) != old); + return old; +} + +#include <asm/cmpxchg-xchg.h> + +#endif /* __ASM_SH_CMPXCHG_CAS_H */ |