blob: fd68504749699ea19fb8d57294dc7dac35c453bf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
#ifndef __ASM_METAG_CMPXCHG_LOCK1_H
#define __ASM_METAG_CMPXCHG_LOCK1_H
#include <asm/global_lock.h>
/* Use LOCK2 as these have to be atomic w.r.t. ordinary accesses. */
static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
unsigned long flags, retval;
__global_lock2(flags);
fence();
retval = *m;
*m = val;
__global_unlock2(flags);
return retval;
}
static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
unsigned long flags, retval;
__global_lock2(flags);
fence();
retval = *m;
*m = val & 0xff;
__global_unlock2(flags);
return retval;
}
static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
unsigned long new)
{
__u32 retval;
unsigned long flags;
__global_lock2(flags);
retval = *m;
if (retval == old) {
fence();
*m = new;
}
__global_unlock2(flags);
return retval;
}
#endif /* __ASM_METAG_CMPXCHG_LOCK1_H */
|