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authorJeremy Fitzhardinge <jeremy@goop.org>2008-09-07 15:21:13 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-13 10:20:56 +0200
commitbe43d72835ba610e4af274f2d123b26f66f4f7ed (patch)
tree004fe651aff85c6cfae6a174217b05d948b7cf6d /arch/x86/mm/init_64.c
parent07bb2f6236f11169fbd8a8916b16715b25fea9b6 (diff)
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 <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 3e10054c573..dec5c775e92 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -89,7 +89,7 @@ early_param("gbpages", parse_direct_gbpages_on);
int after_bootmem;
-unsigned long __supported_pte_mask __read_mostly = ~0UL;
+pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
EXPORT_SYMBOL_GPL(__supported_pte_mask);
static int do_not_nx __cpuinitdata;