658aa18ade
* support "memdebug" mckernel option * check buffer overrun when memory free and next mcexec run * check double free * check memory leak when next mcexec run
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/**
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* \file arch/x86/kernel/include/cas.h
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* License details are found in the file LICENSE.
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* \brief
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* compare and swap
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* \author Tomoki Shirasawa <tomoki.shirasawa.kk@hitachi-solutions.com> \par
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* Copyright (C) 2012 - 2013 Hitachi, Ltd.
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*/
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/*
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* HISTORY:
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*/
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#ifndef __HEADER_X86_COMMON_CAS_H
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#define __HEADER_X86_COMMON_CAS_H
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// return 0:fail, 1:success
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static inline int
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compare_and_swap(void *addr, unsigned long olddata, unsigned long newdata)
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{
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unsigned long before;
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asm volatile (
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"lock; cmpxchgq %2,%1"
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: "=a" (before), "+m" (*(unsigned long *)addr)
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: "q" (newdata), "0" (olddata)
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: "cc");
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return before == olddata;
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}
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#if 0 // cmpxchg16b was not support on k1om
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// return 0:fail, 1:success
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static inline int
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compare_and_swap16(void *addr, void *olddata, void *newdata)
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{
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char rc;
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asm volatile (
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"lock; cmpxchg16b %0; setz %1"
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: "=m" (*(long *)addr), "=q" (rc)
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: "m" (*(long *)addr),
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"d" (((long *)olddata)[0]), "a" (((long *)olddata)[1]),
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"c" (((long *)newdata)[0]), "b" (((long *)newdata)[1])
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: "memory");
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return rc;
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}
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#endif
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#endif /*__HEADER_X86_COMMON_CAS_H*/
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