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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_MICROBLAZE_CMPXCHG_H
   3#define _ASM_MICROBLAZE_CMPXCHG_H
   4
   5#include <linux/irqflags.h>
   6
   7void __bad_xchg(volatile void *ptr, int size);
   8
   9static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
  10                                                                int size)
  11{
  12        unsigned long ret;
  13        unsigned long flags;
  14
  15        switch (size) {
  16        case 1:
  17                local_irq_save(flags);
  18                ret = *(volatile unsigned char *)ptr;
  19                *(volatile unsigned char *)ptr = x;
  20                local_irq_restore(flags);
  21                break;
  22
  23        case 4:
  24                local_irq_save(flags);
  25                ret = *(volatile unsigned long *)ptr;
  26                *(volatile unsigned long *)ptr = x;
  27                local_irq_restore(flags);
  28                break;
  29        default:
  30                __bad_xchg(ptr, size), ret = 0;
  31                break;
  32        }
  33
  34        return ret;
  35}
  36
  37#define xchg(ptr, x) \
  38        ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
  39
  40#include <asm-generic/cmpxchg.h>
  41#include <asm-generic/cmpxchg-local.h>
  42
  43#endif /* _ASM_MICROBLAZE_CMPXCHG_H */
  44