[Xen-devel] understanding __linear_l2_table and friends

[Scott Parish <srparish@xxxxxxxxxx>]

I was trying to understand the states behind domain creation, but i'm
having troubles getting past this. Would someone mind saying a few
words about what these are and (if still needed) why these calculations
work for that?

xen/include/asm-x86/page.h:
   #define linear_l1_table                                                 \
       ((l1_pgentry_t *)(LINEAR_PT_VIRT_START))
   #define __linear_l2_table                                                 \
       ((l2_pgentry_t *)(LINEAR_PT_VIRT_START +                            \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<0))))
   #define __linear_l3_table                                                 \
       ((l3_pgentry_t *)(LINEAR_PT_VIRT_START +                            \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<0)) +   \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<1))))
   #define __linear_l4_table                                                 \
       ((l4_pgentry_t *)(LINEAR_PT_VIRT_START +                            \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<0)) +   \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<1)) +   \
                        (LINEAR_PT_VIRT_START >> (PAGETABLE_ORDER<<2))))
   
Thanks!
sRp

-- 
Scott Parish

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel