Merge branch 'akpm' (Andrew's patch-bomb)
[linux-3.10.git] / arch / ia64 / include / uapi / asm / cmpxchg.h
1 #ifndef _ASM_IA64_CMPXCHG_H
2 #define _ASM_IA64_CMPXCHG_H
3
4 /*
5  * Compare/Exchange, forked from asm/intrinsics.h
6  * which was:
7  *
8  *      Copyright (C) 2002-2003 Hewlett-Packard Co
9  *      David Mosberger-Tang <davidm@hpl.hp.com>
10  */
11
12 #ifndef __ASSEMBLY__
13
14 #include <linux/types.h>
15 /* include compiler specific intrinsics */
16 #include <asm/ia64regs.h>
17 #ifdef __INTEL_COMPILER
18 # include <asm/intel_intrin.h>
19 #else
20 # include <asm/gcc_intrin.h>
21 #endif
22
23 /*
24  * This function doesn't exist, so you'll get a linker error if
25  * something tries to do an invalid xchg().
26  */
27 extern void ia64_xchg_called_with_bad_pointer(void);
28
29 #define __xchg(x, ptr, size)                                            \
30 ({                                                                      \
31         unsigned long __xchg_result;                                    \
32                                                                         \
33         switch (size) {                                                 \
34         case 1:                                                         \
35                 __xchg_result = ia64_xchg1((__u8 *)ptr, x);             \
36                 break;                                                  \
37                                                                         \
38         case 2:                                                         \
39                 __xchg_result = ia64_xchg2((__u16 *)ptr, x);            \
40                 break;                                                  \
41                                                                         \
42         case 4:                                                         \
43                 __xchg_result = ia64_xchg4((__u32 *)ptr, x);            \
44                 break;                                                  \
45                                                                         \
46         case 8:                                                         \
47                 __xchg_result = ia64_xchg8((__u64 *)ptr, x);            \
48                 break;                                                  \
49         default:                                                        \
50                 ia64_xchg_called_with_bad_pointer();                    \
51         }                                                               \
52         __xchg_result;                                                  \
53 })
54
55 #define xchg(ptr, x)                                                    \
56 ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
57
58 /*
59  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
60  * store NEW in MEM.  Return the initial value in MEM.  Success is
61  * indicated by comparing RETURN with OLD.
62  */
63
64 #define __HAVE_ARCH_CMPXCHG 1
65
66 /*
67  * This function doesn't exist, so you'll get a linker error
68  * if something tries to do an invalid cmpxchg().
69  */
70 extern long ia64_cmpxchg_called_with_bad_pointer(void);
71
72 #define ia64_cmpxchg(sem, ptr, old, new, size)                          \
73 ({                                                                      \
74         __u64 _o_, _r_;                                                 \
75                                                                         \
76         switch (size) {                                                 \
77         case 1:                                                         \
78                 _o_ = (__u8) (long) (old);                              \
79                 break;                                                  \
80         case 2:                                                         \
81                 _o_ = (__u16) (long) (old);                             \
82                 break;                                                  \
83         case 4:                                                         \
84                 _o_ = (__u32) (long) (old);                             \
85                 break;                                                  \
86         case 8:                                                         \
87                 _o_ = (__u64) (long) (old);                             \
88                 break;                                                  \
89         default:                                                        \
90                 break;                                                  \
91         }                                                               \
92         switch (size) {                                                 \
93         case 1:                                                         \
94                 _r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_);      \
95                 break;                                                  \
96                                                                         \
97         case 2:                                                         \
98                 _r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_);     \
99                 break;                                                  \
100                                                                         \
101         case 4:                                                         \
102                 _r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_);     \
103                 break;                                                  \
104                                                                         \
105         case 8:                                                         \
106                 _r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_);     \
107                 break;                                                  \
108                                                                         \
109         default:                                                        \
110                 _r_ = ia64_cmpxchg_called_with_bad_pointer();           \
111                 break;                                                  \
112         }                                                               \
113         (__typeof__(old)) _r_;                                          \
114 })
115
116 #define cmpxchg_acq(ptr, o, n)  \
117         ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
118 #define cmpxchg_rel(ptr, o, n)  \
119         ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
120
121 /* for compatibility with other platforms: */
122 #define cmpxchg(ptr, o, n)      cmpxchg_acq((ptr), (o), (n))
123 #define cmpxchg64(ptr, o, n)    cmpxchg_acq((ptr), (o), (n))
124
125 #define cmpxchg_local           cmpxchg
126 #define cmpxchg64_local         cmpxchg64
127
128 #ifdef CONFIG_IA64_DEBUG_CMPXCHG
129 # define CMPXCHG_BUGCHECK_DECL  int _cmpxchg_bugcheck_count = 128;
130 # define CMPXCHG_BUGCHECK(v)                                            \
131 do {                                                                    \
132         if (_cmpxchg_bugcheck_count-- <= 0) {                           \
133                 void *ip;                                               \
134                 extern int printk(const char *fmt, ...);                \
135                 ip = (void *) ia64_getreg(_IA64_REG_IP);                \
136                 printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
137                 break;                                                  \
138         }                                                               \
139 } while (0)
140 #else /* !CONFIG_IA64_DEBUG_CMPXCHG */
141 # define CMPXCHG_BUGCHECK_DECL
142 # define CMPXCHG_BUGCHECK(v)
143 #endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
144
145 #endif /* !__ASSEMBLY__ */
146
147 #endif /* _ASM_IA64_CMPXCHG_H */