arch/h8300/include/asm/cmpxchg.h

   1 #ifndef __ARCH_H8300_CMPXCHG__
   2 #define __ARCH_H8300_CMPXCHG__
   3
   4 #include <linux/irqflags.h>
   5
   6 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
   7
   8 struct __xchg_dummy { unsigned long a[100]; };
   9 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
  10
  11 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
  12 {
  13   unsigned long tmp, flags;
  14
  15   local_irq_save(flags);
  16
  17   switch (size) {
  18   case 1:
  19     __asm__ __volatile__
  20     ("mov.b %2,%0\n\t"
  21      "mov.b %1,%2"
  22     : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
  23     break;
  24   case 2:
  25     __asm__ __volatile__
  26     ("mov.w %2,%0\n\t"
  27      "mov.w %1,%2"
  28     : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
  29     break;
  30   case 4:
  31     __asm__ __volatile__
  32     ("mov.l %2,%0\n\t"
  33      "mov.l %1,%2"
  34     : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
  35     break;
  36   default:
  37     tmp = 0;
  38   }
  39   local_irq_restore(flags);
  40   return tmp;
  41 }
  42
  43 #include <asm-generic/cmpxchg-local.h>
  44
  45 /*
  46  * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
  47  * them available.
  48  */
  49 #define cmpxchg_local(ptr, o, n)                                               \
  50         ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
  51                         (unsigned long)(n), sizeof(*(ptr))))
  52 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
  53
  54 #ifndef CONFIG_SMP
  55 #include <asm-generic/cmpxchg.h>
  56 #endif
  57
  58 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  59
  60 #endif /* __ARCH_H8300_CMPXCHG__ */