linux-kernel - Re: Access MSR functions in userspace?

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Message-Id: <200802060600.35498.maximlevitsky@gmail.com>
Date:	Wed, 6 Feb 2008 06:00:35 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	hasan@...italpath.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Access MSR functions in userspace?

On Wednesday, 6 February 2008 05:29:47 Hasan Rashid wrote:
> Is there a way to use RDMSR and WRMSR in userspace? I only need to write
> to one register, writing a module with a userspace piece to handle that
> seems like an over kill.
> 
> TIA!

Fortunately linux have /dev/cpu/*/msr
Take  look at $LINUX_SOURCES/arch/x86/kernel/msr.c to learn how to use it.

Best regards,
	Maxim Levitsky
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