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1 #ifndef __ARCH_H8300_CMPXCHG__
2 #define __ARCH_H8300_CMPXCHG__
3 
4 #include <linux/irqflags.h>
5 
6 #define xchg(ptr, x) \
7 	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
8 				    sizeof(*(ptr))))
9 
10 struct __xchg_dummy { unsigned long a[100]; };
11 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
12 
__xchg(unsigned long x,volatile void * ptr,int size)13 static inline unsigned long __xchg(unsigned long x,
14 				   volatile void *ptr, int size)
15 {
16 	unsigned long tmp, flags;
17 
18 	local_irq_save(flags);
19 
20 	switch (size) {
21 	case 1:
22 		__asm__ __volatile__
23 			("mov.b %2,%0\n\t"
24 			 "mov.b %1,%2"
25 			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
26 		break;
27 	case 2:
28 		__asm__ __volatile__
29 			("mov.w %2,%0\n\t"
30 			 "mov.w %1,%2"
31 			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
32 		break;
33 	case 4:
34 		__asm__ __volatile__
35 			("mov.l %2,%0\n\t"
36 			 "mov.l %1,%2"
37 			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
38 		break;
39 	default:
40 		tmp = 0;
41 	}
42 	local_irq_restore(flags);
43 	return tmp;
44 }
45 
46 #include <asm-generic/cmpxchg-local.h>
47 
48 /*
49  * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
50  * them available.
51  */
52 #define cmpxchg_local(ptr, o, n)					 \
53 	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),		 \
54 						     (unsigned long)(o), \
55 						     (unsigned long)(n), \
56 						     sizeof(*(ptr))))
57 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
58 
59 #ifndef CONFIG_SMP
60 #include <asm-generic/cmpxchg.h>
61 #endif
62 
63 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
64 
65 #endif /* __ARCH_H8300_CMPXCHG__ */
66