Re: [lkcd-devel] cross system lcrash - PAE support

[Richard J M. <ric...@uk...>]

Shouldn't we include all bits in CR4 that relate to memory management?


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                      bh...@li...                                                                                                   
                      Sent by:                           To:       Andreas Herrmann/Germany/IBM@IBMDE                                         
                      lkc...@li...ur        cc:       lkc...@li...                                           
                      ceforge.net                        Subject:  Re: [lkcd-devel] cross system lcrash - PAE support                         
                                                                                                                                              
                                                                                                                                              
                      23/05/2002 06:25                                                                                                        
                      Please respond to bharata                                                                                               
                                                                                                                                              
                                                                                                                                              



On Wed, May 22, 2002 at 08:00:04PM +0200, Andreas Herrmann wrote:
>
> I have merged the PAE support into the cross-system-lcrash branch.

Briefly looked into libklib/kl_page_i386.c. I had added error checking to
address translation code (mmap_virtop in libklib/arch/i386/kl_page.c),
so that we don't return junk physical address if pgd/pmd/pte are
bad. Didn't find this bit in your code. Any reasons for removing ?
Do you feel such a check isn't needed any more ?

> The question is how to detect whether the system is PAE-enabled or
> not.
>
> Would be nice to have a flag or something in the i386 dump header
> that could indicate whether the dump contains a PAE system or not.
>

Ok, we can turn on this flag while configuring arch-specific header.
This flag can be set if the PAE bit in cr4 is set.
Something like,
             if (read_cr4() & X86_CR4_PAE)
                         dump_header_asm.flag = 1;

Regards,
Bharata.

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