linux-kernel - Re: MediaGX/GeodeGX1 requires X86

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Message-ID: <ada3b5253p0.fsf@cisco.com>
Date:	Mon, 19 Feb 2007 11:48:27 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	takada <takada@....nifty.com>, pcnet32@...izon.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: MediaGX/GeodeGX1 requires X86_OOSTORE.

 > 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).
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