2 * cmpxchg.h -- forked from asm/atomic.h with this copyright:
4 * Copyright 2010 Tilera Corporation. All Rights Reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation, version 2.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for
18 #ifndef _ASM_TILE_CMPXCHG_H
19 #define _ASM_TILE_CMPXCHG_H
23 #include <asm/barrier.h>
25 /* Nonexistent functions intended to cause compile errors. */
26 extern void __xchg_called_with_bad_pointer(void)
27 __compiletime_error("Bad argument size for xchg");
28 extern void __cmpxchg_called_with_bad_pointer(void)
29 __compiletime_error("Bad argument size for cmpxchg");
33 /* Note the _atomic_xxx() routines include a final mb(). */
34 int _atomic_xchg(int *ptr
, int n
);
35 int _atomic_xchg_add(int *v
, int i
);
36 int _atomic_xchg_add_unless(int *v
, int a
, int u
);
37 int _atomic_cmpxchg(int *ptr
, int o
, int n
);
38 long long _atomic64_xchg(long long *v
, long long n
);
39 long long _atomic64_xchg_add(long long *v
, long long i
);
40 long long _atomic64_xchg_add_unless(long long *v
, long long a
, long long u
);
41 long long _atomic64_cmpxchg(long long *v
, long long o
, long long n
);
43 #define xchg(ptr, n) \
45 if (sizeof(*(ptr)) != 4) \
46 __xchg_called_with_bad_pointer(); \
48 (typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n)); \
51 #define cmpxchg(ptr, o, n) \
53 if (sizeof(*(ptr)) != 4) \
54 __cmpxchg_called_with_bad_pointer(); \
56 (typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o, \
60 #define xchg64(ptr, n) \
62 if (sizeof(*(ptr)) != 8) \
63 __xchg_called_with_bad_pointer(); \
65 (typeof(*(ptr)))_atomic64_xchg((long long *)(ptr), \
69 #define cmpxchg64(ptr, o, n) \
71 if (sizeof(*(ptr)) != 8) \
72 __cmpxchg_called_with_bad_pointer(); \
74 (typeof(*(ptr)))_atomic64_cmpxchg((long long *)ptr, \
75 (long long)o, (long long)n); \
80 #define xchg(ptr, n) \
84 switch (sizeof(*(ptr))) { \
86 __x = (typeof(__x))(unsigned long) \
88 (u32)(unsigned long)(n)); \
92 __insn_exch((ptr), (unsigned long)(n)); \
95 __xchg_called_with_bad_pointer(); \
102 #define cmpxchg(ptr, o, n) \
104 typeof(*(ptr)) __x; \
105 __insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o)); \
107 switch (sizeof(*(ptr))) { \
109 __x = (typeof(__x))(unsigned long) \
110 __insn_cmpexch4((ptr), \
111 (u32)(unsigned long)(n)); \
114 __x = (typeof(__x))__insn_cmpexch((ptr), \
118 __cmpxchg_called_with_bad_pointer(); \
126 #define cmpxchg64 cmpxchg
130 #define tas(ptr) xchg((ptr), 1)
132 #endif /* __ASSEMBLY__ */
134 #endif /* _ASM_TILE_CMPXCHG_H */