diff options
Diffstat (limited to 'arch/h8300/include/asm/cmpxchg.h')
-rw-r--r-- | arch/h8300/include/asm/cmpxchg.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/h8300/include/asm/cmpxchg.h b/arch/h8300/include/asm/cmpxchg.h new file mode 100644 index 000000000000..cdb203ef681f --- /dev/null +++ b/arch/h8300/include/asm/cmpxchg.h | |||
@@ -0,0 +1,60 @@ | |||
1 | #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 | |||
8 | struct __xchg_dummy { unsigned long a[100]; }; | ||
9 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) | ||
10 | |||
11 | static 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__ */ | ||