x86, pat: Use page flags to track memtypes of RAM pages

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Change reserve_ram_pages_type and free_ram_pages_type to use 2 page
flags to track UC_MINUS, WC, WB and default types. Previous RAM tracking
just tracked WB or NonWB, which was not complete and did not allow
tracking of RAM fully and there was no way to get the actual type
reserved by looking at the page flags.

We use the memtype_lock spinlock for atomicity in dealing with
memtype tracking in struct page.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Venkatesh Pallipadi 2009-07-10 09:57:38 -07:00 • committed by H. Peter Anvin

parent 46cf98cdae

commit f584174096

2 changed files with 102 additions and 43 deletions

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54

arch/x86/include/asm/cacheflush.h

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95

arch/x86/mm/pat.c

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