On Mon, Mar 04, 2013 at 01:45:20PM -0800, Andy Lutomirski wrote:
> vsyscalls are only 4k. Am I missing something obvious her?
Right, but we're reserving 5 level2 pages for this, i.e. 5*512*4K = 10M.
I.e., each level2 page contains 512 ptes, each pointing to a 4K page.
arch/x86/kernel/head_64.S:
...
NEXT_PAGE(level2_fixmap_pgt)
.fill 506,8,0
.quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE
/* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */
.fill 5,8,0
NEXT_PAGE(level1_fixmap_pgt)
.fill 512,8,0
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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