LXR linux/arch/h8300/include/asm/cmpxchg.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ARCH_H8300_CMPXCHG__
   3#define __ARCH_H8300_CMPXCHG__
   4
   5#include <linux/irqflags.h>
   6
   7#define xchg(ptr, x) \
   8        ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
   9                                    sizeof(*(ptr))))
  10
  11struct __xchg_dummy { unsigned long a[100]; };
  12#define __xg(x) ((volatile struct __xchg_dummy *)(x))
  13
  14static inline unsigned long __xchg(unsigned long x,
  15                                   volatile void *ptr, int size)
  16{
  17        unsigned long tmp, flags;
  18
  19        local_irq_save(flags);
  20
  21        switch (size) {
  22        case 1:
  23                __asm__ __volatile__
  24                        ("mov.b %2,%0\n\t"
  25                         "mov.b %1,%2"
  26                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  27                break;
  28        case 2:
  29                __asm__ __volatile__
  30                        ("mov.w %2,%0\n\t"
  31                         "mov.w %1,%2"
  32                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  33                break;
  34        case 4:
  35                __asm__ __volatile__
  36                        ("mov.l %2,%0\n\t"
  37                         "mov.l %1,%2"
  38                         : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
  39                break;
  40        default:
  41                tmp = 0;
  42        }
  43        local_irq_restore(flags);
  44        return tmp;
  45}
  46
  47#include <asm-generic/cmpxchg-local.h>
  48
  49/*
  50 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
  51 * them available.
  52 */
  53#define cmpxchg_local(ptr, o, n)                                         \
  54        ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),              \
  55                                                     (unsigned long)(o), \
  56                                                     (unsigned long)(n), \
  57                                                     sizeof(*(ptr))))
  58#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
  59
  60#ifndef CONFIG_SMP
  61#include <asm-generic/cmpxchg.h>
  62#endif
  63
  64#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  65
  66#endif /* __ARCH_H8300_CMPXCHG__ */
  67