diff options
| author | Vinod Rex <vrex@nvidia.com> | 2011-10-07 11:30:35 -0700 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:49:18 -0800 |
| commit | 3e6793f5b88bdbe33294bb50f7424c0a3af70b0a (patch) | |
| tree | 472746a8ffb1d80d2ceb7376f578636d0b4ed2c2 /arch/arm/include/asm/cacheflush.h | |
| parent | 25ff8cf8fae7de0a7a47afbe54ea4e298b93e66d (diff) | |
arm: mm: change_page_attr support
bug 865816
Adapted from x86 change_page_attr() implementation
Change-Id: I398c9d460b841484de4fcfcac10ffffdf49a4a5a
Reviewed-on: http://git-master/r/56769
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Tested-by: Krishna Reddy <vdumpa@nvidia.com>
Rebase-Id: Rddeccf358c948ba84af52316f084814ae53dca5e
Diffstat (limited to 'arch/arm/include/asm/cacheflush.h')
| -rw-r--r-- | arch/arm/include/asm/cacheflush.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h index d5d8d5c72682..c57641bf36e2 100644 --- a/arch/arm/include/asm/cacheflush.h +++ b/arch/arm/include/asm/cacheflush.h @@ -344,4 +344,53 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end) flush_cache_all(); } +/* + * The set_memory_* API can be used to change various attributes of a virtual + * address range. The attributes include: + * Cachability : UnCached, WriteCombining, WriteBack + * Executability : eXeutable, NoteXecutable + * Read/Write : ReadOnly, ReadWrite + * Presence : NotPresent + * + * Within a catagory, the attributes are mutually exclusive. + * + * The implementation of this API will take care of various aspects that + * are associated with changing such attributes, such as: + * - Flushing TLBs + * - Flushing CPU caches + * - Making sure aliases of the memory behind the mapping don't violate + * coherency rules as defined by the CPU in the system. + * + * What this API does not do: + * - Provide exclusion between various callers - including callers that + * operation on other mappings of the same physical page + * - Restore default attributes when a page is freed + * - Guarantee that mappings other than the requested one are + * in any state, other than that these do not violate rules for + * the CPU you have. Do not depend on any effects on other mappings, + * CPUs other than the one you have may have more relaxed rules. + * The caller is required to take care of these. + */ + +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_iwb(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); +int set_memory_np(unsigned long addr, int numpages); +int set_memory_4k(unsigned long addr, int numpages); + +int set_memory_array_uc(unsigned long *addr, int addrinarray); +int set_memory_array_wc(unsigned long *addr, int addrinarray); +int set_memory_array_wb(unsigned long *addr, int addrinarray); +int set_memory_array_iwb(unsigned long *addr, int addrinarray); + +int set_pages_array_uc(struct page **pages, int addrinarray); +int set_pages_array_wc(struct page **pages, int addrinarray); +int set_pages_array_wb(struct page **pages, int addrinarray); +int set_pages_array_iwb(struct page **pages, int addrinarray); + #endif |