43 lines
880 B
C
43 lines
880 B
C
#ifndef _ASM_MICROBLAZE_CMPXCHG_H
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#define _ASM_MICROBLAZE_CMPXCHG_H
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#include <linux/irqflags.h>
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void __bad_xchg(volatile void *ptr, int size);
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static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
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int size)
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{
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unsigned long ret;
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unsigned long flags;
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switch (size) {
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case 1:
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local_irq_save(flags);
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ret = *(volatile unsigned char *)ptr;
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*(volatile unsigned char *)ptr = x;
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local_irq_restore(flags);
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break;
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case 4:
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local_irq_save(flags);
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ret = *(volatile unsigned long *)ptr;
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*(volatile unsigned long *)ptr = x;
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local_irq_restore(flags);
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break;
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default:
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__bad_xchg(ptr, size), ret = 0;
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break;
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}
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return ret;
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}
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#define xchg(ptr, x) \
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((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
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#include <asm-generic/cmpxchg.h>
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#include <asm-generic/cmpxchg-local.h>
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#endif /* _ASM_MICROBLAZE_CMPXCHG_H */
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