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