RE: [Xen-devel] PAE: config and file layout

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> To be able to add the PAE specific changes, we need to settle on a
> #define for ifdefing around them in the core Xen code.
> 
> What about CONFIG_PAE?  We could add this to asm-x86/config.h if pae=y
> is passed in on the make line (via Rules.mk)

CONFIG_PAE seems reasonable.
 
> New parallel files vs. ifdef existing files:
> 
> Has anyone settled on if the PAE code is going into the files under
> xen/arch/x86/x86_32, using #ifdef's for PAE, or are you 
> planning to add
> a parallel directory to x86_32 and x86_64 under xen/arch?

Most of the changes can be hidden in header files. There should be no
need for extra c files.

> Same question for headers.  Are you adding the 3-level page tables to
> the existing include/asm-x86/x86_32/page.h using #ifdef's or adding a
> new directory parallel to x86_32 and x86_64 which would have a new
> page.h, etc?

Having a separate 2 and 3 level file that is conditionally included by
x86_32/page.h would seem to be the best approach.

Ian


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