cmpxchg.h

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#ifndef _ASM_MICROBLAZE_CMPXCHG_H
#define _ASM_MICROBLAZE_CMPXCHG_H

#include <linux/irqflags.h>

void __bad_xchg(volatile void *ptr, int size);

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
                                int size)
{
    unsigned long ret;
    unsigned long flags;

    switch (size) {
    case 1:
        local_irq_save(flags);
        ret = *(volatile unsigned char *)ptr;
        *(volatile unsigned char *)ptr = x;
        local_irq_restore(flags);
        break;

    case 4:
        local_irq_save(flags);
        ret = *(volatile unsigned long *)ptr;
        *(volatile unsigned long *)ptr = x;
        local_irq_restore(flags);
        break;
    default:
        __bad_xchg(ptr, size), ret = 0;
        break;
    }

    return ret;
}

#define xchg(ptr, x) \
    ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))

#include <asm-generic/cmpxchg.h>
#include <asm-generic/cmpxchg-local.h>

#endif /* _ASM_MICROBLAZE_CMPXCHG_H */