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[Xen-devel] understanding __linear_l2_table and friends
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] understanding __linear_l2_table and friends |
| From: | Scott Parish <srparish@xxxxxxxxxx> |
| Date: | Tue, 19 Apr 2005 23:03:51 +0000 |
| Delivery-date: | Tue, 19 Apr 2005 23:14:40 +0000 |
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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
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