61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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#ifndef __ARCH_H8300_CMPXCHG__
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#define __ARCH_H8300_CMPXCHG__
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#include <linux/irqflags.h>
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#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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struct __xchg_dummy { unsigned long a[100]; };
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#define __xg(x) ((volatile struct __xchg_dummy *)(x))
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static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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unsigned long tmp, flags;
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local_irq_save(flags);
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switch (size) {
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case 1:
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__asm__ __volatile__
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("mov.b %2,%0\n\t"
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"mov.b %1,%2"
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
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break;
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case 2:
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__asm__ __volatile__
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("mov.w %2,%0\n\t"
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"mov.w %1,%2"
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
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break;
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case 4:
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__asm__ __volatile__
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("mov.l %2,%0\n\t"
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"mov.l %1,%2"
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");
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break;
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default:
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tmp = 0;
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}
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local_irq_restore(flags);
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return tmp;
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}
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#include <asm-generic/cmpxchg-local.h>
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/*
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
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* them available.
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*/
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#define cmpxchg_local(ptr, o, n) \
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((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
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(unsigned long)(n), sizeof(*(ptr))))
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
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#ifndef CONFIG_SMP
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#include <asm-generic/cmpxchg.h>
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#endif
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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#endif /* __ARCH_H8300_CMPXCHG__ */
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