linux-kernel - Re: [PATCH] x86_64: Reload CS when startup

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Message-ID: <m1psetqg7d.fsf@ebiederm.dsl.xmission.com>
Date:	Tue, 22 Aug 2006 03:20:54 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andi Kleen <ak@...e.de>
Cc:	Magnus Damm <magnus@...inux.co.jp>, fastboot@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: Reload CS when startup_64 is used.

Andi Kleen <ak@...e.de> writes:

> On Tue, 22 Aug 2006 02:37:44 -0600
> ebiederm@...ssion.com (Eric W. Biederman) wrote:
>
>> 
>> In long mode the %cs is largely a relic.  However there are a few cases
>> like lret 
>
> You mean iret?

Yes, sorry.

>
>> +	 * jump.  In addition we need to ensure %cs is set so we make this
>> +	 * a far return.	
>>  	 */
>>  	movq	initial_code(%rip),%rax
>> -	jmp	*%rax
>> +	pushq	$__KERNEL_CS
>> +	pushq	%rax
>> +	lretq
>
> Ok merged thanks
>
> -Andi
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