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1 #ifndef __ASM_SH_CMPXCHG_H
2 #define __ASM_SH_CMPXCHG_H
3
4 /*
5  * Atomic operations that C can't guarantee us.  Useful for
6  * resource counting etc..
7  */
8
9 #include <linux/compiler.h>
10 #include <linux/types.h>
11
12 #if defined(CONFIG_GUSA_RB)
13 #include <asm/cmpxchg-grb.h>
14 #elif defined(CONFIG_CPU_SH4A)
15 #include <asm/cmpxchg-llsc.h>
16 #else
17 #include <asm/cmpxchg-irq.h>
18 #endif
19
20 extern void __xchg_called_with_bad_pointer(void);
21
22 #define __xchg(ptr, x, size)                            \
23 ({                                                      \
24         unsigned long __xchg__res;                      \
25         volatile void *__xchg_ptr = (ptr);              \
26         switch (size) {                                 \
27         case 4:                                         \
28                 __xchg__res = xchg_u32(__xchg_ptr, x);  \
29                 break;                                  \
30         case 1:                                         \
31                 __xchg__res = xchg_u8(__xchg_ptr, x);   \
32                 break;                                  \
33         default:                                        \
34                 __xchg_called_with_bad_pointer();       \
35                 __xchg__res = x;                        \
36                 break;                                  \
37         }                                               \
38                                                         \
39         __xchg__res;                                    \
40 })
41
42 #define xchg(ptr,x)     \
43         ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
44
45 /* This function doesn't exist, so you'll get a linker error
46  * if something tries to do an invalid cmpxchg(). */
47 extern void __cmpxchg_called_with_bad_pointer(void);
48
49 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
50                 unsigned long new, int size)
51 {
52         switch (size) {
53         case 4:
54                 return __cmpxchg_u32(ptr, old, new);
55         }
56         __cmpxchg_called_with_bad_pointer();
57         return old;
58 }
59
60 #define cmpxchg(ptr,o,n)                                                 \
61   ({                                                                     \
62      __typeof__(*(ptr)) _o_ = (o);                                       \
63      __typeof__(*(ptr)) _n_ = (n);                                       \
64      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
65                                     (unsigned long)_n_, sizeof(*(ptr))); \
66   })
67
68 #endif /* __ASM_SH_CMPXCHG_H */