EVOLUTION-MANAGER

Edit File: cacheflush.h

#ifndef _ASM_X86_CACHEFLUSH_H #define _ASM_X86_CACHEFLUSH_H /* Caches aren't brain-dead on the intel. */ #include <asm-generic/cacheflush.h> #include <asm/special_insns.h> #include <asm/uaccess.h> #ifdef CONFIG_X86_PAT /* * X86 PAT uses page flags WC and Uncached together to keep track of * memory type of pages that have backing page struct. X86 PAT supports 3 * different memory types, _PAGE_CACHE_MODE_WB, _PAGE_CACHE_MODE_WC and * _PAGE_CACHE_MODE_UC_MINUS and fourth state where page's memory type has not * been changed from its default (value of -1 used to denote this). * Note we do not support _PAGE_CACHE_MODE_UC here. */ #define _PGMT_DEFAULT 0 #define _PGMT_WC (1UL << PG_arch_1) #define _PGMT_UC_MINUS (1UL << PG_uncached) #define _PGMT_WB (1UL << PG_uncached | 1UL << PG_arch_1) #define _PGMT_MASK (1UL << PG_uncached | 1UL << PG_arch_1) #define _PGMT_CLEAR_MASK (~_PGMT_MASK) static inline enum page_cache_mode get_page_memtype(struct page *pg) { unsigned long pg_flags = pg->flags & _PGMT_MASK; if (pg_flags == _PGMT_DEFAULT) return -1; else if (pg_flags == _PGMT_WC) return _PAGE_CACHE_MODE_WC; else if (pg_flags == _PGMT_UC_MINUS) return _PAGE_CACHE_MODE_UC_MINUS; else return _PAGE_CACHE_MODE_WB; } static inline void set_page_memtype(struct page *pg, enum page_cache_mode memtype) { unsigned long memtype_flags; unsigned long old_flags; unsigned long new_flags; switch (memtype) { case _PAGE_CACHE_MODE_WC: memtype_flags = _PGMT_WC; break; case _PAGE_CACHE_MODE_UC_MINUS: memtype_flags = _PGMT_UC_MINUS; break; case _PAGE_CACHE_MODE_WB: memtype_flags = _PGMT_WB; break; default: memtype_flags = _PGMT_DEFAULT; break; } do { old_flags = pg->flags; new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags; } while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags); } #else static inline enum page_cache_mode get_page_memtype(struct page *pg) { return -1; } static inline void set_page_memtype(struct page *pg, enum page_cache_mode memtype) { } #endif /* * 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 * Encryption : Encrypted, Decrypted * * Within a category, 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_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); 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_encrypted(unsigned long addr, int numpages); int set_memory_decrypted(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_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); /* * For legacy compatibility with the old APIs, a few functions * are provided that work on a "struct page". * These functions operate ONLY on the 1:1 kernel mapping of the * memory that the struct page represents, and internally just * call the set_memory_* function. See the description of the * set_memory_* function for more details on conventions. * * These APIs should be considered *deprecated* and are likely going to * be removed in the future. * The reason for this is the implicit operation on the 1:1 mapping only, * making this not a generally useful API. * * Specifically, many users of the old APIs had a virtual address, * called virt_to_page() or vmalloc_to_page() on that address to * get a struct page* that the old API required. * To convert these cases, use set_memory_*() on the original * virtual address, do not use these functions. */ 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); void clflush_cache_range(void *addr, unsigned int size); #define mmio_flush_range(addr, size) clflush_cache_range(addr, size) #ifdef CONFIG_DEBUG_RODATA void mark_rodata_ro(void); extern const int rodata_test_data; extern int kernel_set_to_readonly; void set_kernel_text_rw(void); void set_kernel_text_ro(void); #else static inline void set_kernel_text_rw(void) { } static inline void set_kernel_text_ro(void) { } #endif #ifdef CONFIG_DEBUG_RODATA_TEST int rodata_test(void); #else static inline int rodata_test(void) { return 0; } #endif #endif /* _ASM_X86_CACHEFLUSH_H */