blob: cdb203ef681fd39b575d44fe8eb658c4b216204c [file] [log] [blame]
David Howellsa5401ee2012-03-28 18:30:02 +01001#ifndef __ARCH_H8300_CMPXCHG__
2#define __ARCH_H8300_CMPXCHG__
3
4#include <linux/irqflags.h>
5
6#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
7
8struct __xchg_dummy { unsigned long a[100]; };
9#define __xg(x) ((volatile struct __xchg_dummy *)(x))
10
11static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
12{
13 unsigned long tmp, flags;
14
15 local_irq_save(flags);
16
17 switch (size) {
18 case 1:
19 __asm__ __volatile__
20 ("mov.b %2,%0\n\t"
21 "mov.b %1,%2"
22 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
23 break;
24 case 2:
25 __asm__ __volatile__
26 ("mov.w %2,%0\n\t"
27 "mov.w %1,%2"
28 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
29 break;
30 case 4:
31 __asm__ __volatile__
32 ("mov.l %2,%0\n\t"
33 "mov.l %1,%2"
34 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
35 break;
36 default:
37 tmp = 0;
38 }
39 local_irq_restore(flags);
40 return tmp;
41}
42
43#include <asm-generic/cmpxchg-local.h>
44
45/*
46 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
47 * them available.
48 */
49#define cmpxchg_local(ptr, o, n) \
50 ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
51 (unsigned long)(n), sizeof(*(ptr))))
52#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
53
54#ifndef CONFIG_SMP
55#include <asm-generic/cmpxchg.h>
56#endif
57
58#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
59
60#endif /* __ARCH_H8300_CMPXCHG__ */