1 #ifndef __ASM_SH_CMPXCHG_IRQ_H
2 #define __ASM_SH_CMPXCHG_IRQ_H
3
4 #include <linux/irqflags.h>
5
xchg_u32(volatile u32 * m,unsigned long val)6 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
7 {
8 unsigned long flags, retval;
9
10 local_irq_save(flags);
11 retval = *m;
12 *m = val;
13 local_irq_restore(flags);
14 return retval;
15 }
16
xchg_u8(volatile u8 * m,unsigned long val)17 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
18 {
19 unsigned long flags, retval;
20
21 local_irq_save(flags);
22 retval = *m;
23 *m = val & 0xff;
24 local_irq_restore(flags);
25 return retval;
26 }
27
__cmpxchg_u32(volatile int * m,unsigned long old,unsigned long new)28 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
29 unsigned long new)
30 {
31 __u32 retval;
32 unsigned long flags;
33
34 local_irq_save(flags);
35 retval = *m;
36 if (retval == old)
37 *m = new;
38 local_irq_restore(flags); /* implies memory barrier */
39 return retval;
40 }
41
42 #endif /* __ASM_SH_CMPXCHG_IRQ_H */
43