diff options
Diffstat (limited to 'include/asm-x86_64/cmpxchg.h')
-rw-r--r-- | include/asm-x86_64/cmpxchg.h | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/include/asm-x86_64/cmpxchg.h b/include/asm-x86_64/cmpxchg.h deleted file mode 100644 index 5e182062e6ec..000000000000 --- a/include/asm-x86_64/cmpxchg.h +++ /dev/null | |||
@@ -1,134 +0,0 @@ | |||
1 | #ifndef __ASM_CMPXCHG_H | ||
2 | #define __ASM_CMPXCHG_H | ||
3 | |||
4 | #include <asm/alternative.h> /* Provides LOCK_PREFIX */ | ||
5 | |||
6 | #define xchg(ptr,v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v),(ptr),sizeof(*(ptr)))) | ||
7 | |||
8 | #define __xg(x) ((volatile long *)(x)) | ||
9 | |||
10 | static inline void set_64bit(volatile unsigned long *ptr, unsigned long val) | ||
11 | { | ||
12 | *ptr = val; | ||
13 | } | ||
14 | |||
15 | #define _set_64bit set_64bit | ||
16 | |||
17 | /* | ||
18 | * Note: no "lock" prefix even on SMP: xchg always implies lock anyway | ||
19 | * Note 2: xchg has side effect, so that attribute volatile is necessary, | ||
20 | * but generally the primitive is invalid, *ptr is output argument. --ANK | ||
21 | */ | ||
22 | static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) | ||
23 | { | ||
24 | switch (size) { | ||
25 | case 1: | ||
26 | __asm__ __volatile__("xchgb %b0,%1" | ||
27 | :"=q" (x) | ||
28 | :"m" (*__xg(ptr)), "0" (x) | ||
29 | :"memory"); | ||
30 | break; | ||
31 | case 2: | ||
32 | __asm__ __volatile__("xchgw %w0,%1" | ||
33 | :"=r" (x) | ||
34 | :"m" (*__xg(ptr)), "0" (x) | ||
35 | :"memory"); | ||
36 | break; | ||
37 | case 4: | ||
38 | __asm__ __volatile__("xchgl %k0,%1" | ||
39 | :"=r" (x) | ||
40 | :"m" (*__xg(ptr)), "0" (x) | ||
41 | :"memory"); | ||
42 | break; | ||
43 | case 8: | ||
44 | __asm__ __volatile__("xchgq %0,%1" | ||
45 | :"=r" (x) | ||
46 | :"m" (*__xg(ptr)), "0" (x) | ||
47 | :"memory"); | ||
48 | break; | ||
49 | } | ||
50 | return x; | ||
51 | } | ||
52 | |||
53 | /* | ||
54 | * Atomic compare and exchange. Compare OLD with MEM, if identical, | ||
55 | * store NEW in MEM. Return the initial value in MEM. Success is | ||
56 | * indicated by comparing RETURN with OLD. | ||
57 | */ | ||
58 | |||
59 | #define __HAVE_ARCH_CMPXCHG 1 | ||
60 | |||
61 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | ||
62 | unsigned long new, int size) | ||
63 | { | ||
64 | unsigned long prev; | ||
65 | switch (size) { | ||
66 | case 1: | ||
67 | __asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2" | ||
68 | : "=a"(prev) | ||
69 | : "q"(new), "m"(*__xg(ptr)), "0"(old) | ||
70 | : "memory"); | ||
71 | return prev; | ||
72 | case 2: | ||
73 | __asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2" | ||
74 | : "=a"(prev) | ||
75 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
76 | : "memory"); | ||
77 | return prev; | ||
78 | case 4: | ||
79 | __asm__ __volatile__(LOCK_PREFIX "cmpxchgl %k1,%2" | ||
80 | : "=a"(prev) | ||
81 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
82 | : "memory"); | ||
83 | return prev; | ||
84 | case 8: | ||
85 | __asm__ __volatile__(LOCK_PREFIX "cmpxchgq %1,%2" | ||
86 | : "=a"(prev) | ||
87 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
88 | : "memory"); | ||
89 | return prev; | ||
90 | } | ||
91 | return old; | ||
92 | } | ||
93 | |||
94 | static inline unsigned long __cmpxchg_local(volatile void *ptr, | ||
95 | unsigned long old, unsigned long new, int size) | ||
96 | { | ||
97 | unsigned long prev; | ||
98 | switch (size) { | ||
99 | case 1: | ||
100 | __asm__ __volatile__("cmpxchgb %b1,%2" | ||
101 | : "=a"(prev) | ||
102 | : "q"(new), "m"(*__xg(ptr)), "0"(old) | ||
103 | : "memory"); | ||
104 | return prev; | ||
105 | case 2: | ||
106 | __asm__ __volatile__("cmpxchgw %w1,%2" | ||
107 | : "=a"(prev) | ||
108 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
109 | : "memory"); | ||
110 | return prev; | ||
111 | case 4: | ||
112 | __asm__ __volatile__("cmpxchgl %k1,%2" | ||
113 | : "=a"(prev) | ||
114 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
115 | : "memory"); | ||
116 | return prev; | ||
117 | case 8: | ||
118 | __asm__ __volatile__("cmpxchgq %1,%2" | ||
119 | : "=a"(prev) | ||
120 | : "r"(new), "m"(*__xg(ptr)), "0"(old) | ||
121 | : "memory"); | ||
122 | return prev; | ||
123 | } | ||
124 | return old; | ||
125 | } | ||
126 | |||
127 | #define cmpxchg(ptr,o,n)\ | ||
128 | ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ | ||
129 | (unsigned long)(n),sizeof(*(ptr)))) | ||
130 | #define cmpxchg_local(ptr,o,n)\ | ||
131 | ((__typeof__(*(ptr)))__cmpxchg_local((ptr),(unsigned long)(o),\ | ||
132 | (unsigned long)(n),sizeof(*(ptr)))) | ||
133 | |||
134 | #endif | ||