From 75cbade8ea3127a84e3da7c2c15808e54f0df7e8 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Wed, 30 Jan 2008 13:34:06 +0100 Subject: 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_ and set_memory_, 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 Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- include/asm-x86/cacheflush.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include/asm-x86') diff --git a/include/asm-x86/cacheflush.h b/include/asm-x86/cacheflush.h index fccb563e230..7b928d55c19 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 -- cgit v1.2.3