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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2008-03-18 20:00:14 -0400
committerIngo Molnar <mingo@elte.hu>2008-04-17 11:41:19 -0400
commit2e5d9c857d4e6c9e7b7d8c8c86a68a7842d213d6 (patch)
tree6c90c0f9f38ff85e2f42ddc0f4ef0291cdd47d38 /include/asm-x86/pgtable.h
parentd27554d874c7eeb14c8bfecdc39c3a8618cd8d32 (diff)
x86: PAT infrastructure patch
Sets up pat_init() infrastructure. PAT MSR has following setting. PAT |PCD ||PWT ||| 000 WB _PAGE_CACHE_WB 001 WC _PAGE_CACHE_WC 010 UC- _PAGE_CACHE_UC_MINUS 011 UC _PAGE_CACHE_UC We are effectively changing WT from boot time setting to WC. UC_MINUS is used to provide backward compatibility to existing /dev/mem users(X). reserve_memtype and free_memtype are new interfaces for maintaining alias-free mapping. It is currently implemented in a simple way with a linked list and not optimized. reserve and free tracks the effective memory type, as a result of PAT and MTRR setting rather than what is actually requested in PAT. pat_init piggy backs on mtrr_init as the rules for setting both pat and mtrr are same. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/pgtable.h')
-rw-r--r--include/asm-x86/pgtable.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 9cf472aeb9ce..ca6deb3de7c0 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -57,6 +57,12 @@
57 57
58#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 58#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
59 59
60#define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
61#define _PAGE_CACHE_WB (0)
62#define _PAGE_CACHE_WC (_PAGE_PWT)
63#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
64#define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
65
60#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) 66#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
61#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) 67#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
62 68