Re: [Xen-ia64-devel] Question to frametable_miss()

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

Hi Dietmar,

I wrote this code. 
There is no speical reason except for my debugging.
Currently the value should be 0.
If Xen uses protection keys, the value must follow it too.

Thanks,
Kouya

Dietmar Hahn writes:
 > Hi,
 > 
 > currently I'am looking at the code to bring in protection key support in xen 
 > and found the following lines in arch/ia64/xen/ivt.S within the  function
 > GLOBAL_ENTRY(frametable_miss)
 > ....
 > mov r25=0x700|(PAGE_SHIFT<<2) // key=7
 > ...
 > mov cr.itir=r25
 > 
 > What is the sense of the 0x700 ? Currently Xen doesn't use protection keys.
 > So why is this explicitly set here?
 > Many thanks for any hints!
 > 
 > Dietmar.
 > 
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 > Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
 > http://lists.xensource.com/xen-ia64-devel

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