Messages in this thread Patch in this message | | | Date | Tue, 18 Mar 2008 17:00:23 -0700 | From | venkatesh.pallipadi@intel ... | Subject | [patch 11/13] 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 <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Index: linux-2.6-x86.git/arch/x86/mm/pageattr.c =================================================================== --- linux-2.6-x86.git.orig/arch/x86/mm/pageattr.c 2008-03-18 03:23:49.000000000 -0700 +++ linux-2.6-x86.git/arch/x86/mm/pageattr.c 2008-03-18 03:53:45.000000000 -0700 @@ -788,6 +788,25 @@ } 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, Index: linux-2.6-x86.git/include/asm-x86/cacheflush.h =================================================================== --- linux-2.6-x86.git.orig/include/asm-x86/cacheflush.h 2008-03-18 03:21:25.000000000 -0700 +++ linux-2.6-x86.git/include/asm-x86/cacheflush.h 2008-03-18 03:53:45.000000000 -0700 @@ -35,8 +35,10 @@ int set_pages_rw(struct page *page, int numpages); int _set_memory_uc(unsigned long addr, int numpages); +int _set_memory_wc(unsigned long addr, int numpages); int _set_memory_wb(unsigned long addr, int numpages); int set_memory_uc(unsigned long addr, int numpages); +int set_memory_wc(unsigned long addr, int numpages); int set_memory_wb(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages); --
| |