1 #ifndef _ASM_MICROBLAZE_CMPXCHG_H
2 #define _ASM_MICROBLAZE_CMPXCHG_H
3
4 #include <linux/irqflags.h>
5
6 void __bad_xchg(volatile void *ptr, int size);
7
__xchg(unsigned long x,volatile void * ptr,int size)8 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
9 int size)
10 {
11 unsigned long ret;
12 unsigned long flags;
13
14 switch (size) {
15 case 1:
16 local_irq_save(flags);
17 ret = *(volatile unsigned char *)ptr;
18 *(volatile unsigned char *)ptr = x;
19 local_irq_restore(flags);
20 break;
21
22 case 4:
23 local_irq_save(flags);
24 ret = *(volatile unsigned long *)ptr;
25 *(volatile unsigned long *)ptr = x;
26 local_irq_restore(flags);
27 break;
28 default:
29 __bad_xchg(ptr, size), ret = 0;
30 break;
31 }
32
33 return ret;
34 }
35
36 #define xchg(ptr, x) \
37 ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
38
39 #include <asm-generic/cmpxchg.h>
40 #include <asm-generic/cmpxchg-local.h>
41
42 #endif /* _ASM_MICROBLAZE_CMPXCHG_H */
43