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Add xen_atomic_cmpxchg16(), which exports the cmpxchgw instruction to C.

This commit is contained in:
bouyer 2006-03-06 19:55:47 +00:00
parent 2e6c8a97d2
commit fa2d4a51e2
1 changed files with 15 additions and 1 deletions
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16
sys/arch/xen/include/xen.h
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@ -1,4 +1,4 @@
/* $NetBSD: xen.h,v 1.20 2006/02/16 20:17:15 perry Exp $ */
/* $NetBSD: xen.h,v 1.21 2006/03/06 19:55:47 bouyer Exp $ */
/*
*
@ -201,6 +201,20 @@ xen_atomic_xchg(volatile XATOMIC_T *ptr, unsigned long val)
return result;
}
static inline uint16_t
xen_atomic_cmpxchg16(volatile uint16_t *ptr, uint16_t val, uint16_t newval)
{
unsigned long result;
__asm volatile(__LOCK_PREFIX
"cmpxchgw %w1,%2"
:"=a" (result)
:"q"(newval), "m" (*ptr), "0" (val)
:"memory");
return result;
}
static __inline void
xen_atomic_setbits_l (volatile XATOMIC_T *ptr, unsigned long bits) {
__asm volatile("lock ; orl %1,%0" : "=m" (*ptr) : "ir" (bits));