Re: initialize page tables -- Re: paging question

From: Brian Gerst (bgerst@didntduck.org)
Date: Wed Feb 20 2002 - 15:30:36 EST

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Jason Yan wrote:
>
> Thank you Dick
>
> Oops, I use a wrong subject, what I want to ask is how the pg0 be initialized
>
> in head.S,
>
> 395 .org 0x2000
> 396 ENTRY(pg0)
>
> so $pg0-__PAGE_OFFSET = 0x2000 - 0xC0000000 = 40002000, how comes bff00000 ?

That's offset 0x2000 from the beginning of head.o, which is at virtual
address 0xc0100000, meaning the final value of pg0 is 0xc0102000.
Subtract __PAGE_OFFSET and you get physical address 0x00102000.

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