Re: pentium 4MB pages question for you MMU hackers

Morgan Sarges (blip@sodak.net)
Fri, 03 Jan 1997 19:52:23 +0000

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Ingo Molnar wrote:
>
> just wondering if ring 3 code could use 4MB pages.
>
> When i have the following page dir entry:
>
> _PAGE_TABLE | _PAGE_4M | 4mb_aligned_phys_addr
>
> Kernel space sees phys_addr correctly, but user space doesnt. Does this
> mean that 4MB pages are only for ring0 code? Has anyone experimented with
> this one?
>
> [heh, if only for ring0 then one more argument for GGI being in the kernel
> .. and one more argument for ring0 processes]
>
> -- mingo
>
> ps. and i got faults when phys_addr wasnt 4mb aligned ... does it really
> have to be 4mb aligned?

Id like to ask a dumb question here, before I say something really
ignorant.

What is ring0 code? How does it relate to linux/unix?

What are GGI's?

If ring0 is what I think it is, this could make 1997 very long and ugly.

-- 
Morgan Sarges			Warbirds: blip
http://www.sodak.net/~blip
blip@sodak.net

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