arch/rx/include/asm/cmpxchg.h

   1 #ifndef __ARCH_RX_CMPXCHG__
   2 #define __ARCH_RX_CMPXCHG__
   3
   4 #define xchg(ptr, x) \
   5         ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
   6                                     sizeof(*(ptr))))
   7
   8 struct __xchg_dummy { unsigned long a[100]; };
   9 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
  10
  11 extern void __bad_xchg_size(void);
  12
  13 static inline unsigned long __xchg(unsigned long x,
  14                                    volatile void *ptr, int size)
  15 {
  16         switch (size) {
  17         case 1:
  18                 __asm__ __volatile__
  19                         ("xchg %1.b,%0"
  20                          : "+r" (x), "+Q" (*__xg(ptr)));
  21                 break;
  22         case 2:
  23                 __asm__ __volatile__
  24                         ("xchg %1.w,%0"
  25                          : "+r" (x), "+Q" (*__xg(ptr)));
  26                 break;
  27         case 4:
  28                 __asm__ __volatile__
  29                         ("xchg %1.l,%0"
  30                          : "+r" (x), "+Q" (*__xg(ptr)));
  31                 break;
  32         default:
  33                 __bad_xchg_size();
  34         }
  35         return x;
  36 }
  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),              \
  46                                                      (unsigned long)(o), \
  47                                                      (unsigned long)(n), \
  48                                                      sizeof(*(ptr))))
  49 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
  50
  51 #ifndef CONFIG_SMP
  52 #include <asm-generic/cmpxchg.h>
  53 #endif
  54
  55 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  56
  57 #endif /* __ARCH_RX_CMPXCHG__ */