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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Wang, Baojun" <wangbj@lzu.edu.cn>
Cc: linuxppc-dev@ozlabs.org, rtlinuxgpl@upv.es,
	Nicholas Mc Guire <der.herr@hofr.at>,
	Miguel Masmano <mimastel@doctor.upv.es>,
	linux-embedded@opentech.lzu.edu.cn
Subject: Re: ppc manual paging question
Date: Mon, 22 Oct 2007 14:50:52 +1000	[thread overview]
Message-ID: <1193028652.6745.57.camel@pasglop> (raw)
In-Reply-To: <200710221203.24157.wangbj@lzu.edu.cn>


On Mon, 2007-10-22 at 12:03 +0800, Wang, Baojun wrote:
> hi,
> 
>   I've got some qeustion about ppc(ppc44x) paging: 
> 
> how can I manually map a virtual address to a physical address through a 
> specific pgd? How does ppc translate virt address to physical one? I think 
> besides from tlb, the CPU will search the page table entries via the pgd, can 
> I alter the pgd value to change the memory translation? under i386, it's very 
> simple, we can just rewrite %%cr3, it even could invalidate all tlb entries 
> automatically, how can I do this under ppc? I've tried rewrite 
> current->mm->pgd and current->thread.pgdir, but sounds like it still not 
> insufficiant, am I missing something vital? 

What the heck are you trying to do ? Please explain and I'll tell you
how to do it properly :-)

Cheers,
Ben.

  parent reply	other threads:[~2007-10-22  4:52 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-22  4:03 ppc manual paging question Wang, Baojun
2007-10-22  4:03 ` Wang, Baojun
2007-10-22  4:40   ` Nicholas Mc Guire
2007-10-22  4:50 ` Benjamin Herrenschmidt [this message]
     [not found] ` <393029235.18964@lzu.edu.cn>
2007-10-22  5:50   ` Wang, Baojun
2007-10-22  5:50     ` Wang, Baojun
2007-10-22  6:01     ` Benjamin Herrenschmidt
     [not found]     ` <393033430.04221@lzu.edu.cn>
2007-10-22  6:17       ` Wang, Baojun
2007-10-22  6:17         ` Wang, Baojun
2007-10-22  7:53           ` [Rtlinuxgpl] " Nicholas Mc Guire
2007-10-22  7:34         ` Benjamin Herrenschmidt
     [not found]         ` <393039004.29574@lzu.edu.cn>
2007-10-22  7:42           ` Wang, Baojun
2007-10-22  7:42             ` Wang, Baojun
2007-10-22  8:04             ` Benjamin Herrenschmidt
     [not found]             ` <393040796.08064@lzu.edu.cn>
2007-10-26  9:50               ` Wang, Baojun
2007-10-26  9:50                 ` Wang, Baojun

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