From: Jeremy Fitzhardinge Date: Sun, 7 Sep 2008 22:21:13 +0000 (-0700) Subject: x86: add _PAGE_IOMAP pte flag for IO mappings X-Git-Tag: v2.6.28-rc1~611^2~70 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be43d72835ba610e4af274f2d123b26f66f4f7ed;p=pandora-kernel.git x86: add _PAGE_IOMAP pte flag for IO mappings Use one of the software-defined PTE bits to indicate that a mapping is intended for an IO address. On native hardware this is irrelevent, since a physical address is a physical address. But in a virtual environment, physical addresses are also virtualized, so there needs to be some way to distinguish between pseudo-physical addresses and actual hardware addresses; _PAGE_IOMAP indicates this intent. By default, __supported_pte_mask masks out _PAGE_IOMAP, so it doesn't even appear in the final pagetable. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed