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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2008-03-19 03:00:14 +0300
committerIngo Molnar <mingo@elte.hu>2008-04-17 19:41:19 +0400
commit2e5d9c857d4e6c9e7b7d8c8c86a68a7842d213d6 (patch)
tree6c90c0f9f38ff85e2f42ddc0f4ef0291cdd47d38 /include/asm-x86/mtrr.h
parentd27554d874c7eeb14c8bfecdc39c3a8618cd8d32 (diff)
downloadlinux-2e5d9c857d4e6c9e7b7d8c8c86a68a7842d213d6.tar.xz
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/mtrr.h')
-rw-r--r--include/asm-x86/mtrr.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86/mtrr.h b/include/asm-x86/mtrr.h
index 319d065800be..968794af93f9 100644
--- a/include/asm-x86/mtrr.h
+++ b/include/asm-x86/mtrr.h
@@ -84,6 +84,8 @@ struct mtrr_gentry
#ifdef __KERNEL__
+extern u8 mtrr_type_lookup(u64 addr, u64 end);
+
/* The following functions are for use by other drivers */
# ifdef CONFIG_MTRR
extern void mtrr_save_fixed_ranges(void *);