49 lines
914 B
C
49 lines
914 B
C
#ifndef __ASM_METAG_CMPXCHG_LOCK1_H
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#define __ASM_METAG_CMPXCHG_LOCK1_H
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#include <asm/global_lock.h>
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/* Use LOCK2 as these have to be atomic w.r.t. ordinary accesses. */
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static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
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{
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unsigned long flags, retval;
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__global_lock2(flags);
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fence();
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retval = *m;
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*m = val;
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__global_unlock2(flags);
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return retval;
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}
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static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
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{
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unsigned long flags, retval;
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__global_lock2(flags);
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fence();
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retval = *m;
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*m = val & 0xff;
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__global_unlock2(flags);
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return retval;
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}
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static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
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unsigned long new)
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{
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__u32 retval;
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unsigned long flags;
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__global_lock2(flags);
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retval = *m;
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if (retval == old) {
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fence();
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*m = new;
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}
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__global_unlock2(flags);
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return retval;
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}
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#endif /* __ASM_METAG_CMPXCHG_LOCK1_H */
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