arch/microblaze/include/asm/cmpxchg.h

   1 #ifndef _ASM_MICROBLAZE_CMPXCHG_H
   2 #define _ASM_MICROBLAZE_CMPXCHG_H
   3
   4 void __bad_xchg(volatile void *ptr, int size);
   5
   6 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
   7                                                                 int size)
   8 {
   9         unsigned long ret;
  10         unsigned long flags;
  11
  12         switch (size) {
  13         case 1:
  14                 local_irq_save(flags);
  15                 ret = *(volatile unsigned char *)ptr;
  16                 *(volatile unsigned char *)ptr = x;
  17                 local_irq_restore(flags);
  18                 break;
  19
  20         case 4:
  21                 local_irq_save(flags);
  22                 ret = *(volatile unsigned long *)ptr;
  23                 *(volatile unsigned long *)ptr = x;
  24                 local_irq_restore(flags);
  25                 break;
  26         default:
  27                 __bad_xchg(ptr, size), ret = 0;
  28                 break;
  29         }
  30
  31         return ret;
  32 }
  33
  34 #define xchg(ptr, x) \
  35         ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
  36
  37 #include <asm-generic/cmpxchg.h>
  38 #include <asm-generic/cmpxchg-local.h>
  39
  40 #endif /* _ASM_MICROBLAZE_CMPXCHG_H */