LXR linux/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) \
   7        ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
   8                                    sizeof(*(ptr))))
   9
  10struct __xchg_dummy { unsigned long a[100]; };
  11#define __xg(x) ((volatile struct __xchg_dummy *)(x))
  12
  13static inline unsigned long __xchg(unsigned long x,
  14                                   volatile void *ptr, int size)
  15{
  16        unsigned long tmp, flags;
  17
  18        local_irq_save(flags);
  19
  20        switch (size) {
  21        case 1:
  22                __asm__ __volatile__
  23                        ("mov.b %2,%0\n\t"
  24                         "mov.b %1,%2"
  25                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  26                break;
  27        case 2:
  28                __asm__ __volatile__
  29                        ("mov.w %2,%0\n\t"
  30                         "mov.w %1,%2"
  31                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  32                break;
  33        case 4:
  34                __asm__ __volatile__
  35                        ("mov.l %2,%0\n\t"
  36                         "mov.l %1,%2"
  37                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  38                break;
  39        default:
  40                tmp = 0;
  41        }
  42        local_irq_restore(flags);
  43        return tmp;
  44}
  45
  46#include <asm-generic/cmpxchg-local.h>
  47
  48/*
  49 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
  50 * them available.
  51 */
  52#define cmpxchg_local(ptr, o, n)                                         \
  53        ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),              \
  54                                                     (unsigned long)(o), \
  55                                                     (unsigned long)(n), \
  56                                                     sizeof(*(ptr))))
  57#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
  58
  59#ifndef CONFIG_SMP
  60#include <asm-generic/cmpxchg.h>
  61#endif
  62
  63#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  64
  65#endif /* __ARCH_H8300_CMPXCHG__ */
  66