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