Re: [PATCH] x86: Construct 32 bit boot time page tables in nativeformat.

[Pavel Machek]

On Thu 2008-01-24 15:51:24, H. Peter Anvin wrote:
> Jeremy Fitzhardinge wrote:
>> H. Peter Anvin wrote:
>>> While we're mucking around in this area, there is another thing which we 
>>> should eventually get around to fixing:
>>>
>>> we need a set of page tables with an identity mapping as well as the 
>>> kernel mapping, for trampolining (during startup, but also during things 
>>> like ACPI suspend/resume.)  Right now, we let those be the swapper page 
>>> tables, but that's probably not really a good idea, since it can hide 
>>> bugs.
>>
>> So you're suggesting a second system pagetable which has a P=V alias as 
>> well as the normal kernel mapping, used only when we actually need that 
>> alias?  Sounds simple enough to arrange.
>>
>
> I just looked at the ACPI suspend code, and it looks like it hacks its own 
> identity map at runtime.  Pavel, am I reading that code right?

Yes, I think so, I believe we do it on both 32 and 64 bit now.

(It is early here. And I almost got the .c wakeup code to work... it
already sets the mode).
									Pavel
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