/*
* 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__
#include <asm/barrier.h>
/* Nonexistent functions intended to cause compile errors. */
extern void __xchg_called_with_bad_pointer(void)
__compiletime_error("Bad argument size for xchg");
extern void __cmpxchg_called_with_bad_pointer(void)
__compiletime_error("Bad argument size for cmpxchg");
#ifndef __tilegx__
/* Note the _atomic_xxx() routines include a final mb(). */
int _atomic_xchg(int *ptr, int n);
int _atomic_xchg_add(int *v, int i);
int _atomic_xchg_add_unless(int *v, int a, int u);
int _atomic_cmpxchg(int *ptr, int o, int n);
u64 _atomic64_xchg(u64 *v, u64 n);
u64 _atomic64_xchg_add(u64 *v, u64 i);
u64 _atomic64_xchg_add_unless(u64 *v, u64 a, u64 u);
u64 _atomic64_cmpxchg(u64 *v, u64 o, u64 n);
#define xchg(ptr, n) \
({ \
if (sizeof(*(ptr)) != 4) \
__xchg_called_with_bad_pointer(); \
smp_mb(); \
(typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n)); \
})
#define cmpxchg(ptr, o, n) \
({ \
if (sizeof(*(ptr)) != 4) \
__cmpxchg_called_with_bad_pointer(); \
smp_mb(); \
(typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o, (int)n); \
})
#define xchg64(ptr, n) \
({ \
if (sizeof(*(ptr)) != 8) \
__xchg_called_with_bad_pointer(); \
smp_mb(); \
(typeof(*(ptr)))_atomic64_xchg((u64 *)(ptr), (u64)(n)); \
})
#define cmpxchg64(ptr, o, n) \
({ \
if (sizeof(*(ptr)) != 8) \
__cmpxchg_called_with_bad_pointer(); \
smp_mb(); \
(typeof(*(ptr)))_atomic64_cmpxchg((u64 *)ptr, (u64)o, (u64)n); \
})
#else
#define xchg(ptr, n) \
({ \
typeof(*(ptr)) __x; \
smp_mb(); \
switch (sizeof(*(ptr))) { \
case 4: \
__x = (typeof(__x))(unsigned long) \
__insn_exch4((ptr), (u32)(unsigned long)(n)); \
break; \
case 8: \
__x = (typeof(__x)) \
__insn_exch((ptr), (unsigned long)(n)); \
break; \
default: \
__xchg_called_with_bad_pointer(); \
break; \
} \
smp_mb(); \
__x; \
})
#define cmpxchg(ptr, o, n) \
({ \
typeof(*(ptr)) __x; \
__insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o)); \
smp_mb(); \
switch (sizeof(*(ptr))) { \
case 4: \
__x = (typeof(__x))(unsigned long) \
__insn_cmpexch4((ptr), (u32)(unsigned long)(n)); \
break; \
case 8: \
__x = (typeof(__x))__insn_cmpexch((ptr), (u64)(n)); \
break; \
default: \
__cmpxchg_called_with_bad_pointer(); \
break; \
} \
smp_mb(); \
__x; \
})
#define xchg64 xchg
#define cmpxchg64 cmpxchg
#endif
#define tas(ptr) xchg((ptr), 1)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_TILE_CMPXCHG_H */
