1 #ifndef __ASM_CRIS_CMPXCHG__
2 #define __ASM_CRIS_CMPXCHG__
4 #include <linux/irqflags.h>
6 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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 */
14 *((unsigned char *)&temp) = x;
15 x = *(unsigned char *)ptr;
16 *(unsigned char *)ptr = *((unsigned char *)&temp);
19 *((unsigned short *)&temp) = x;
20 x = *(unsigned short *)ptr;
21 *(unsigned short *)ptr = *((unsigned short *)&temp);
25 x = *(unsigned long *)ptr;
26 *(unsigned long *)ptr = temp;
29 local_irq_restore(flags); /* restore irq enable bit */
34 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
36 #define tas(ptr) (xchg((ptr),1))
38 #include <asm-generic/cmpxchg-local.h>
41 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
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))
50 #include <asm-generic/cmpxchg.h>
53 #endif /* __ASM_CRIS_CMPXCHG__ */