130 lines
2.3 KiB
C
130 lines
2.3 KiB
C
/* $NetBSD: atomic.h,v 1.2 2002/11/25 01:36:35 thorpej Exp $ */
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/*-
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*/
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/*
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* Misc. `atomic' operations.
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*/
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#ifndef _POWERPC_ATOMIC_H_
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#define _POWERPC_ATOMIC_H_
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/*
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* atomic_setbits_ulong:
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*
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* Atomically set bits in a `unsigned long'.
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*/
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static __inline void
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atomic_setbits_ulong(__volatile unsigned long *ulp, unsigned long v)
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{
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unsigned long tmp;
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__asm __volatile(
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"# BEGIN atomic_setbits_ulong \n"
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"1: lwarx %0,0,%2 \n"
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" or %0,%1,%0 \n"
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" stwcx. %0,0,%2 \n"
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" bne- 1b \n"
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" sync \n"
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"# END atomic_setbits_ulong \n"
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: "=&r" (tmp)
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: "r" (v), "r" (ulp)
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: "memory");
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}
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/*
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* atomic_clearbits_ulong:
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*
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* Atomically clear bits in a `unsigned long'.
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*/
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static __inline void
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atomic_clearbits_ulong(__volatile unsigned long *ulp, unsigned long v)
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{
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unsigned long tmp;
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__asm __volatile(
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"# BEGIN atomic_clearbits_ulong \n"
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"1: lwarx %0,0,%2 \n"
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" and %0,%1,%0 \n"
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" stwcx. %0,0,%2 \n"
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" bne- 1b \n"
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" sync \n"
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"# END atomic_clearbits_ulong \n"
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: "=&r" (tmp)
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: "r" (~v), "r" (ulp)
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: "memory");
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}
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/*
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* atomic_add_ulong:
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*
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* Atomically add a value to a `unsigned long'.
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*/
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static __inline void
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atomic_add_ulong(__volatile unsigned long *ulp, unsigned long v)
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{
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unsigned long tmp;
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__asm __volatile(
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"# BEGIN atomic_add_ulong \n"
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"1: lwarx %0,0,%2 \n"
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" add %0,%1,%0 \n"
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" stwcx. %0,0,%2 \n"
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" bne- 1b \n"
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" sync \n"
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"# END atomic_add_ulong \n"
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: "=&r" (tmp)
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: "r" (v), "r" (ulp)
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: "memory");
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}
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/*
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* atomic_sub_ulong:
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*
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* Atomically subtract a value from a `unsigned long'.
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*/
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static __inline void
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atomic_sub_ulong(__volatile unsigned long *ulp, unsigned long v)
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{
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unsigned long tmp;
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__asm __volatile(
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"# BEGIN atomic_sub_ulong \n"
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"1: lwarx %0,0,%2 \n"
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" sub %0,%0,%1 \n"
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" stwcx. %0,0,%2 \n"
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" bne- 1b \n"
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" sync \n"
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"# END atomic_sub_ulong \n"
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: "=&r" (tmp)
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: "r" (v), "r" (ulp)
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: "memory");
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}
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/*
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* atomic_loadlatch_ulong:
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*
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* Atomically load and latch a `unsigned long' value.
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*/
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static __inline unsigned long
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atomic_loadlatch_ulong(__volatile unsigned long *ulp, unsigned long v)
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{
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unsigned long tmp;
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__asm __volatile(
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"# BEGIN atomic_loadlatch_ulong \n"
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"1: lwarx %0,0,%2 \n"
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" stwcx. %1,0,%2 \n"
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" bne- 1b \n"
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" sync \n"
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"# END atomic_loadlatch_ulong \n"
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: "=r" (tmp)
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: "r" (v), "r" (ulp)
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: "memory");
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return (tmp);
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}
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#endif /* _POWERPC_ATOMIC_H_ */
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