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[Xen-devel] PAE guest address maps?

  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Randy Thelen <rthelen@xxxxxxxxxx>
  • Date: Wed, 25 Oct 2006 16:56:59 -0700
  • Delivery-date: Wed, 25 Oct 2006 16:57:28 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Folks --

I'm looking through a PAE guest's address map and I'm trying to make sense out of it. Is there some documentation about these address regions:

0xc0000000 - 0xc0800000: 8MB    x/8x 0xc0000000
0xfde00000 - 0xfde04000: 16KB   x/8x 0xfde00000
0xfdfac000 - 0xfdfae000: 8KB    NOT READABLE
0xfdfb4000 - 0xfdfc0000: 48KB   NOT READABLE
0xfdfe4000 - 0xfdfe6000: 8KB    NOT READABLE
0xfdfec000 - 0xfdff0000: 16KB   x/8x 0xfdfec000
0xfdff4000 - 0xfe000000: 48KB   NOT READABLE

Is the above map documented in the general case somewhere?

And, where are they setup? Inside Xen? Inside Xend? And, in what files?

It looks like Xen builds a (set of) self referential page table pointers (i.e., page table entries that are pointers to the page table itself. Where is that documented?

Last, where's the mfn to pfn array?

-- Randy

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