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Date: Fri, 18 Jan 2002 16:37:19 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: DervishD <raul@viadomus.com>
cc: bgerst@didntduck.org, linux-kernel@vger.kernel.org, yinlei_yu@hotmail.com
Subject: Re: Is there anyway to use 4M pages on x86 linux in user level?
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On Fri, 18 Jan 2002, DervishD wrote:

>     Hi Brian :)
> 
> >The large page size is 4MB, except in PAE mode where they are 2MB. 
> >Normal pages are always 4KB.  Noting in the GDT affects the page
> >size.
> 
>     The entries in the GDT, do not set the page size for that
> descriptor? I'm certainly rusted on the i386 O:)))
> 
>     Ra?l

Nope! You might be confusing the "granularity" number. This just
tells the CPU how to interpret the rest of the stuff. Right now
the base and limit is set for 32-bits for a, gawd help me, 
`segment`. You can go back to 16-bit segments if you want.

Paging is different, there's a single bit that controls the size
of a page; small or big, nothing in-between.  That's it.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).

    I was going to compile a list of innovations that could be
    attributed to Microsoft. Once I realized that Ctrl-Alt-Del
    was handled in the BIOS, I found that there aren't any.


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