[Xen-devel] paging

[PUCCETTI Armand <armand.puccetti@xxxxxx>]

I have a few easy questions about the xen code doing paging on AMD64.

How is the page translation function virt-to-phys (AMD64 arch programmer 
manual, page 147)
implemented ? Refining,

- In file /xen/include/asm-x86/page.h: what are the functions 
lXe_get_pfn, lXe_get_intpte, lXe_get_paddr, lXe_get_page, lXe_from_paddr 
(for X=1,..4) doing?
- One set of functions puzzles me:  l4e_to_l3e, l3e_to_l2e and 
l2e_to_l1e. The comment says "Pagetable
walking"... but what does this mean?  do they help to move from  one 
page map to another?
- In what variables are the real page tables (l4 to l1) stored?

- Does the code implement only long-mode page translation for AMD64?

- Is there anything explaining page.h, page_alloc.c and mm.c ?....

thanks and sorry for the trivial questions.

Armand

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