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/* $OpenBSD: lock.h,v 1.5 2013/05/21 20:05:30 tedu Exp $ */
/* public domain */
#ifndef _MIPS64_LOCK_H_
#define _MIPS64_LOCK_H_
#include <mips64/atomic.h>
#define rw_cas __cpu_cas
static __inline int
__cpu_cas(volatile unsigned long *addr, unsigned long old, unsigned long new)
{
int success, scratch0, scratch1;
__asm volatile(
".set noreorder\n"
"1:\n"
"lld %0, (%5)\n"
"bne %0, %3, 2f\n"
"move %1, %4\n"
"scd %1, (%5)\n"
"beqz %1, 1b\n"
"move %2, $0\n"
"j 3f\n"
"nop\n"
"2:\n"
"daddi %2, $0, 1\n"
"3:\n"
".set reorder\n"
: "=&r"(scratch0), "=&r"(scratch1), "=&r"(success)
: "r"(old), "r"(new), "r"(addr)
: "memory");
return success;
}
#endif /* _MIPS64_LOCK_H_ */
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