63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
#ifndef __PRIVATE_ARCH_M68K_ATOMIC__
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#define __PRIVATE_ARCH_M68K_ATOMIC__
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/* Optimization barrier */
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/* The "volatile" is due to gcc bugs */
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#define barrier() __asm__ __volatile__("": : :"memory")
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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/*
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* We do not have SMP m68k systems, so we don't have to deal with that.
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*/
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typedef struct { int counter; } ncpt_atomic_t;
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#define NCPT_ATOMIC_INIT(i) { (i) }
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#define ncpt_atomic_read(v) ((v)->counter)
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#define ncpt_atomic_set(v, i) (((v)->counter) = i)
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static __inline__ void ncpt_atomic_add(int i, ncpt_atomic_t *v)
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{
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__asm__ __volatile__("addl %1,%0" : "=m" (*v) : "id" (i), "0" (*v));
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}
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static __inline__ void ncpt_atomic_sub(int i, ncpt_atomic_t *v)
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{
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__asm__ __volatile__("subl %1,%0" : "=m" (*v) : "id" (i), "0" (*v));
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}
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static __inline__ void ncpt_atomic_inc(volatile ncpt_atomic_t *v)
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{
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__asm__ __volatile__("addql #1,%0" : "=m" (*v): "0" (*v));
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}
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static __inline__ void ncpt_atomic_dec(volatile ncpt_atomic_t *v)
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{
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__asm__ __volatile__("subql #1,%0" : "=m" (*v): "0" (*v));
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}
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static __inline__ int ncpt_atomic_dec_and_test(volatile ncpt_atomic_t *v)
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{
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char c;
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__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "=m" (*v): "1" (*v));
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return c != 0;
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}
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#define ncpt_atomic_clear_mask(mask, v) \
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__asm__ __volatile__("andl %1,%0" : "=m" (*v) : "id" (~(mask)),"0"(*v))
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#define ncpt_atomic_set_mask(mask, v) \
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__asm__ __volatile__("orl %1,%0" : "=m" (*v) : "id" (mask),"0"(*v))
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/* Atomic operations are already serializing */
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#define smp_mb__before_ncpt_atomic_dec() barrier()
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#define smp_mb__after_ncpt_atomic_dec() barrier()
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#define smp_mb__before_ncpt_atomic_inc() barrier()
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#define smp_mb__after_ncpt_atomic_inc() barrier()
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#endif /* __ARCH_M68K_ATOMIC __ */
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