1#ifndef __ASM_CRIS_CMPXCHG__
2#define __ASM_CRIS_CMPXCHG__
3
4#include <linux/irqflags.h>
5
6static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
7{
8  /* since Etrax doesn't have any atomic xchg instructions, we need to disable
9     irq's (if enabled) and do it with move.d's */
10  unsigned long flags,temp;
11  local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */
12  switch (size) {
13  case 1:
14    *((unsigned char *)&temp) = x;
15    x = *(unsigned char *)ptr;
16    *(unsigned char *)ptr = *((unsigned char *)&temp);
17    break;
18  case 2:
19    *((unsigned short *)&temp) = x;
20    x = *(unsigned short *)ptr;
21    *(unsigned short *)ptr = *((unsigned short *)&temp);
22    break;
23  case 4:
24    temp = x;
25    x = *(unsigned long *)ptr;
26    *(unsigned long *)ptr = temp;
27    break;
28  }
29  local_irq_restore(flags); /* restore irq enable bit */
30  return x;
31}
32
33#define xchg(ptr,x) \
34	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
35
36#define tas(ptr) (xchg((ptr),1))
37
38#include <asm-generic/cmpxchg-local.h>
39
40/*
41 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
42 * them available.
43 */
44#define cmpxchg_local(ptr, o, n)				 	       \
45	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
46			(unsigned long)(n), sizeof(*(ptr))))
47#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
48
49#ifndef CONFIG_SMP
50#include <asm-generic/cmpxchg.h>
51#endif
52
53#endif /* __ASM_CRIS_CMPXCHG__ */
54