forked from Minki/linux
34f2c0ac11
Commitbd119c6923"Disintegrate asm/system.h for Tile" created the asm/switch_to.h file, but did not add an include of it to all its users. Also, commitb4816afa39"Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h" introduced the concept of asm/cmpxchg.h but the tile arch never got one. Fork the cmpxchg content out of the asm/atomic.h file to create one. Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
|
|
* 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))
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_TILE_CMPXCHG_H */
|