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/*
* cmpxchg.h -- forked from asm/atomic.h with this copyright:
*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
*/
#ifndef _ASM_TILE_CMPXCHG_H
#define _ASM_TILE_CMPXCHG_H
#ifndef __ASSEMBLY__
/* Nonexistent functions intended to cause link errors. */
extern unsigned long __xchg_called_with_bad_pointer(void);
extern unsigned long __cmpxchg_called_with_bad_pointer(void);
#define xchg(ptr, x) \
({ \
typeof(*(ptr)) __x; \
switch (sizeof(*(ptr))) { \
case 4: \
__x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
(atomic_t *)(ptr), \
(u32)(typeof((x)-(x)))(x)); \
break; \
case 8: \
__x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
(atomic64_t *)(ptr), \
(u64)(typeof((x)-(x)))(x)); \
break; \
default: \
__xchg_called_with_bad_pointer(); \
} \
__x; \
})
#define cmpxchg(ptr, o, n) \
({ \
typeof(*(ptr)) __x; \
switch (sizeof(*(ptr))) { \
case 4: \
__x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
(atomic_t *)(ptr), \
(u32)(typeof((o)-(o)))(o), \
(u32)(typeof((n)-(n)))(n)); \
break; \
case 8: \
__x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
(atomic64_t *)(ptr), \
(u64)(typeof((o)-(o)))(o), \
(u64)(typeof((n)-(n)))(n)); \
break; \
default: \
__cmpxchg_called_with_bad_pointer(); \
} \
__x; \
})
#define tas(ptr) (xchg((ptr), 1))
#define cmpxchg64(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
cmpxchg((ptr), (o), (n)); \
})
#endif /* __ASSEMBLY__ */
#endif /* _ASM_TILE_CMPXCHG_H */
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