linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Message-ID: <50C78A79.6010306@linux.intel.com>
Date:	Tue, 11 Dec 2012 11:33:13 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On 12/11/2012 11:18 AM, Yinghai Lu wrote:
> 
> that will be bunch of asm code again, and need to parse the setup_header in that
> asm to get range value for those regions...
> 

It's an index into an array, it's not "parsing".

>>
>>> but if the user memmap to exclude some page, we will still need to
>>> relocate the ramdisk.
>>
>> -ENOPARSE
> 
> .. I mean pointer for saved ucode will be updated then again.
> and relocated_initrd wil still need to use ioremap because init_memory_mapping
> will clean mapping the range range that is excluded by memmap=XX$YY
> 
>>
>> I really need to look at this in more detail.  I'm starting to think
>> this is done completely backwards.
> 
> really should not put asm code if it could be done in C in not complicated way.
> 

Uhm... that's not what I'm talking about.

	-hpa

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