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Add x86_sfence(), x86_mfence().

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This commit is contained in:
ad 2006-08-26 20:08:07 +00:00
parent 66cc95bc3f
commit 55154c9edc
2 changed files with 40 additions and 10 deletions
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26
sys/arch/amd64/include/cpufunc.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: cpufunc.h,v 1.8 2006/08/19 16:04:41 dsl Exp $ */
/* $NetBSD: cpufunc.h,v 1.9 2006/08/26 20:08:07 ad Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -55,18 +55,32 @@ x86_pause(void)
/* nothing */
}
/*
* XXX if lfence isn't available...
*
* memory clobber to avoid compiler reordering.
*/
static __inline void
x86_lfence(void)
{
/*
* XXX if lfence isn't available...
*
* memory clobber to avoid compiler reordering.
*/
__asm volatile("lfence" : : : "memory");
}
static __inline void
x86_sfence(void)
{
__asm volatile("sfence" : : : "memory");
}
static __inline void
x86_mfence(void)
{
__asm volatile("mfence" : : : "memory");
}
#ifdef _KERNEL
extern int cpu_feature;

24
sys/arch/i386/include/cpufunc.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: cpufunc.h,v 1.32 2006/08/19 15:21:23 dsl Exp $ */
/* $NetBSD: cpufunc.h,v 1.33 2006/08/26 20:08:07 ad Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -55,13 +55,29 @@ x86_pause(void)
__asm volatile("pause");
}
/*
* XXX it's better to use real lfence insn if available.
*
* memory clobber to avoid compiler reordering.
*/
static __inline void
x86_lfence(void)
{
/*
* XXX it's better to use real lfence insn if available.
*/
__asm volatile("lock; addl $0, 0(%%esp)" : : : "memory");
}
static __inline void
x86_sfence(void)
{
__asm volatile("lock; addl $0, 0(%%esp)" : : : "memory");
}
static __inline void
x86_mfence(void)
{
__asm volatile("lock; addl $0, 0(%%esp)" : : : "memory");
}