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From: "Wang, Baojun" <wangbj@lzu.edu.cn>
To: linuxppc-embedded@ozlabs.org,
 "Barisa Kisku" <barisa.kisku@gmail.com>
Subject: Re: Whether kernel page table is loaded in exception handler?
Date: Mon, 29 Oct 2007 00:04:28 +0800
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On Sunday 28 October 2007 22:58:29, Barisa Kisku wrote=EF=BC=9A
> Hi,
> Whether kernel page table is loaded during the execution of exception
> handling.I tried to understand that bit code, but could n't find out=20
> during the execution of system call exception handling or  external
> interrupt exception handling.
>
>
> thanks in advance.
>
> Barisa Kisku

the external interrupt / syscall exception is not responsible for loading p=
age=20
tables. Depending on the type of exception, probably no more exception is=20
allowed if the exception have disabled the MSR EE bit. Otherwise it's=20
depending on the powerpc model, normally the kernel will search tlb first, =
if=20
there is a (Data/Insn) miss, the kernel will search the page table=20
entry(PTEs), if the PTE is founded, the kernel will reload tlb, otherwise i=
t=20
will raise a page fault exception, this may ask the kernel to load the page=
=20
on demand, if the kernel could not load the requested the page, then we got=
 a=20
double fault (page fault). I'm not sure this is 100% corrent, but help it=20
will help

Wang

=2D-=20
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