linux-kernel - Re: questions about rd{msr|tsc|pmc} instruction with x86-64

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Date:	Fri, 17 Oct 2008 00:31:18 +0800
From:	"Jike Song" <albcamus@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	gcosta@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: questions about rd{msr|tsc|pmc} instruction with x86-64

On Thu, Oct 16, 2008 at 2:39 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Jike Song wrote:
>> {snip}
>
> "A" means rdx:rax on x86-64, not edx:eax.  For a 64-bit number, it means,
> literally, "one of rdx or rax"!  As you correctly point out, this is not how
> rdmsr works.
>
>        -hpa
>

Thanks, Peter!  So I misunderstood the gcc constraint 'A' for x86-64,
but seems the comment "while x86_64 returns at rax" still wrong,
should this be fixed?

-- 
Thanks,
Jike
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