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| author | Arjan van de Ven <arjan@infradead.org> | 2008-01-30 13:34:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:06 +0100 |
| commit | 75cbade8ea3127a84e3da7c2c15808e54f0df7e8 (patch) | |
| tree | b91fd5e8f9f5f8da0da55a7783c70fc3149cbf2d /include/asm-x86/cacheflush.h | |
| parent | e81d5dc41b67349c06e80658227c9156738f0df1 (diff) | |
| download | op-kernel-dev-75cbade8ea3127a84e3da7c2c15808e54f0df7e8.zip op-kernel-dev-75cbade8ea3127a84e3da7c2c15808e54f0df7e8.tar.gz | |
x86: a new API for drivers/etc to control cache and other page attributes
Right now, if drivers or other code want to change, say, a cache attribute of a
page, the only API they have is change_page_attr(). c-p-a is a really bad API
for this, because it forces the caller to know *ALL* the attributes he wants
for the page, not just the 1 thing he wants to change. So code that wants to
set a page uncachable, needs to be aware of the NX status as well etc etc etc.
This patch introduces a set of new APIs for this, set_pages_<attr> and
set_memory_<attr>, that offer a logical change to the user, and leave all
attributes not implied by the requested logical change alone.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/cacheflush.h')
| -rw-r--r-- | include/asm-x86/cacheflush.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-x86/cacheflush.h b/include/asm-x86/cacheflush.h index fccb563..7b928d5 100644 --- a/include/asm-x86/cacheflush.h +++ b/include/asm-x86/cacheflush.h @@ -27,6 +27,21 @@ void global_flush_tlb(void); int change_page_attr(struct page *page, int numpages, pgprot_t prot); int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot); + +int set_pages_uc(struct page *page, int numpages); +int set_pages_wb(struct page *page, int numpages); +int set_pages_x(struct page *page, int numpages); +int set_pages_nx(struct page *page, int numpages); +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_wb(unsigned long addr, int numpages); +int set_memory_x(unsigned long addr, int numpages); +int set_memory_nx(unsigned long addr, int numpages); +int set_memory_ro(unsigned long addr, int numpages); +int set_memory_rw(unsigned long addr, int numpages); + void clflush_cache_range(void *addr, int size); #ifdef CONFIG_DEBUG_RODATA |
