linux-kernel - Re: MediaGX/GeodeGX1 requires X86

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Message-Id: <20070220.085639.260788422.takada@mbf.nifty.com>
Date:	Tue, 20 Feb 2007 08:56:39 +0900 (JST)
From:	takada <takada@....nifty.com>
To:	rdreier@...co.com
Cc:	lsorense@...lub.uwaterloo.ca, pcnet32@...izon.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: MediaGX/GeodeGX1 requires X86_OOSTORE.

From: Roland Dreier <rdreier@...co.com>
Subject: Re: MediaGX/GeodeGX1 requires X86_OOSTORE.
Date: Mon, 19 Feb 2007 11:48:27 -0800

>  > Does anyone know if there is any way to flush a cache line of the cpu to
>  > force rereading system memory for a given address or address range?
> 
> There is the "clflush" instruction, but not all x86 CPUs support it.
> You need to check the CPUID flag to know for sure (/proc/cpuinfo will
> show a "clflush" flag if it is supported).

/proc/cpuinfo with MediaGXm :

processor	: 0
vendor_id	: CyrixInstead
cpu family	: 5
model		: 5
model name	: Cyrix MediaGXtm MMXtm Enhanced
stepping	: 2
cpu MHz		: 199.750
cache size	: 16 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu tsc msr cx8 cmov mmx cxmmx
bogomips	: 401.00
clflush size	: 32
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