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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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-03-18 17:00:23 -07:00 committed by Ingo Molnar
parent 03d72aa18f
commit ef354af462
2 changed files with 21 additions and 0 deletions
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19
arch/x86/mm/pageattr.c
View File

@ -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,

2
include/asm-x86/cacheflush.h
View File

@ -35,8 +35,10 @@ int set_pages_ro(struct page *page, int numpages);
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);