linux-kernel - RE: [PATCH 1/2] x86: Add Isolated Memory Regions for Quark X1000

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Date:	Thu, 8 Jan 2015 14:52:24 +0000
From:	"Ong, Boon Leong" <boon.leong.ong@...el.com>
To:	Bryan O'Donoghue <pure.logic@...us-software.ie>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Darren Hart <dvhart@...radead.org>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>
Subject: RE: [PATCH 1/2] x86: Add Isolated Memory Regions for Quark X1000

>On 07/01/15 23:45, Ong, Boon Leong wrote:
>>> Since BIOS and grub code both use 0x00000000 as the 'off' address I
>>> think it makes sense for the kernel to continue to use that address.
>>
>> Just add on top of what Daren mentioned in another mail, based on the
>> Quark document, the base address can start from zero. Say lo=0, hi=0,
>> and WM & RM may be changed from default value, 1st 1KiB will be marked as
>IMR. It seems to me that there is no good way to test if an IMR is 'occupied'
>and/or 'enabled'
>> since enable-bit is not available. But, what is benefit of testing
>> against lo=0 & hi=0? The logic to calculate size will work under
>> lo=0 & hi=0 anway.
>
>Hi Boon Leong.
>
>I think it does make sense to add a check for rmask and wmask in the 'access all'
>state when determining if an IMR is enabled on X1000 or not

Ya, checking against rmask & wmask whether they have been changed from default stage
would help here. Thanks 
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