From ef354af4629e5cc76a3f64fc46d452f2b56d5a59 Mon Sep 17 00:00:00 2001 From: "venkatesh.pallipadi@intel.com" Date: Tue, 18 Mar 2008 17:00:23 -0700 Subject: x86: PAT add set_memory_wc() interface Add a set_memory_wc interface(), similar to set_memory_uc interface. Callers has to call set_memory_uc, set_memory_wb and set_memory_wc, set_memory_wb as pairs. Signed-off-by: Venkatesh Pallipadi Signed-off-by: Suresh Siddha Signed-off-by: Ingo Molnar --- arch/x86/mm/pageattr.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'arch') diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 938df5e..270cab2e 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -787,6 +787,25 @@ int set_memory_uc(unsigned long addr, int numpages) } EXPORT_SYMBOL(set_memory_uc); +int _set_memory_wc(unsigned long addr, int numpages) +{ + return change_page_attr_set(addr, numpages, + __pgprot(_PAGE_CACHE_WC)); +} + +int set_memory_wc(unsigned long addr, int numpages) +{ + if (!pat_wc_enabled) + return set_memory_uc(addr, numpages); + + if (reserve_memtype(addr, addr + numpages * PAGE_SIZE, + _PAGE_CACHE_WC, NULL)) + return -EINVAL; + + return _set_memory_wc(addr, numpages); +} +EXPORT_SYMBOL(set_memory_wc); + int _set_memory_wb(unsigned long addr, int numpages) { return change_page_attr_clear(addr, numpages, -- cgit v1.1