166 lines
5.7 KiB
C
166 lines
5.7 KiB
C
#ifndef _ASM_X86_CACHEFLUSH_H
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#define _ASM_X86_CACHEFLUSH_H
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/* Caches aren't brain-dead on the intel. */
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#include <asm-generic/cacheflush.h>
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#ifdef CONFIG_X86_PAT
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/*
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* X86 PAT uses page flags WC and Uncached together to keep track of
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* memory type of pages that have backing page struct. X86 PAT supports 3
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* different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
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* _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
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* been changed from its default (value of -1 used to denote this).
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* Note we do not support _PAGE_CACHE_UC here.
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*/
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#define _PGMT_DEFAULT 0
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#define _PGMT_WC (1UL << PG_arch_1)
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#define _PGMT_UC_MINUS (1UL << PG_uncached)
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#define _PGMT_WB (1UL << PG_uncached | 1UL << PG_arch_1)
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#define _PGMT_MASK (1UL << PG_uncached | 1UL << PG_arch_1)
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#define _PGMT_CLEAR_MASK (~_PGMT_MASK)
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static inline unsigned long get_page_memtype(struct page *pg)
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{
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unsigned long pg_flags = pg->flags & _PGMT_MASK;
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if (pg_flags == _PGMT_DEFAULT)
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return -1;
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else if (pg_flags == _PGMT_WC)
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return _PAGE_CACHE_WC;
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else if (pg_flags == _PGMT_UC_MINUS)
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return _PAGE_CACHE_UC_MINUS;
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else
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return _PAGE_CACHE_WB;
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}
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static inline void set_page_memtype(struct page *pg, unsigned long memtype)
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{
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unsigned long memtype_flags = _PGMT_DEFAULT;
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unsigned long old_flags;
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unsigned long new_flags;
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switch (memtype) {
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case _PAGE_CACHE_WC:
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memtype_flags = _PGMT_WC;
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break;
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case _PAGE_CACHE_UC_MINUS:
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memtype_flags = _PGMT_UC_MINUS;
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break;
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case _PAGE_CACHE_WB:
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memtype_flags = _PGMT_WB;
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break;
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}
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do {
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old_flags = pg->flags;
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new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags;
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} while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags);
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}
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#else
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static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
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static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
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#endif
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/*
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* The set_memory_* API can be used to change various attributes of a virtual
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* address range. The attributes include:
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* Cachability : UnCached, WriteCombining, WriteBack
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* Executability : eXeutable, NoteXecutable
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* Read/Write : ReadOnly, ReadWrite
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* Presence : NotPresent
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*
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* Within a category, the attributes are mutually exclusive.
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*
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* The implementation of this API will take care of various aspects that
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* are associated with changing such attributes, such as:
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* - Flushing TLBs
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* - Flushing CPU caches
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* - Making sure aliases of the memory behind the mapping don't violate
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* coherency rules as defined by the CPU in the system.
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*
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* What this API does not do:
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* - Provide exclusion between various callers - including callers that
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* operation on other mappings of the same physical page
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* - Restore default attributes when a page is freed
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* - Guarantee that mappings other than the requested one are
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* in any state, other than that these do not violate rules for
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* the CPU you have. Do not depend on any effects on other mappings,
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* CPUs other than the one you have may have more relaxed rules.
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* The caller is required to take care of these.
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*/
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int _set_memory_uc(unsigned long addr, int numpages);
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int _set_memory_wc(unsigned long addr, int numpages);
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int _set_memory_wb(unsigned long addr, int numpages);
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int set_memory_uc(unsigned long addr, int numpages);
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int set_memory_wc(unsigned long addr, int numpages);
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int set_memory_wb(unsigned long addr, int numpages);
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int set_memory_x(unsigned long addr, int numpages);
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int set_memory_nx(unsigned long addr, int numpages);
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int set_memory_ro(unsigned long addr, int numpages);
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int set_memory_rw(unsigned long addr, int numpages);
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int set_memory_np(unsigned long addr, int numpages);
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int set_memory_4k(unsigned long addr, int numpages);
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int set_memory_array_uc(unsigned long *addr, int addrinarray);
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int set_memory_array_wc(unsigned long *addr, int addrinarray);
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int set_memory_array_wb(unsigned long *addr, int addrinarray);
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int set_pages_array_uc(struct page **pages, int addrinarray);
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int set_pages_array_wc(struct page **pages, int addrinarray);
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int set_pages_array_wb(struct page **pages, int addrinarray);
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/*
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* For legacy compatibility with the old APIs, a few functions
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* are provided that work on a "struct page".
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* These functions operate ONLY on the 1:1 kernel mapping of the
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* memory that the struct page represents, and internally just
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* call the set_memory_* function. See the description of the
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* set_memory_* function for more details on conventions.
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*
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* These APIs should be considered *deprecated* and are likely going to
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* be removed in the future.
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* The reason for this is the implicit operation on the 1:1 mapping only,
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* making this not a generally useful API.
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*
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* Specifically, many users of the old APIs had a virtual address,
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* called virt_to_page() or vmalloc_to_page() on that address to
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* get a struct page* that the old API required.
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* To convert these cases, use set_memory_*() on the original
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* virtual address, do not use these functions.
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*/
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int set_pages_uc(struct page *page, int numpages);
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int set_pages_wb(struct page *page, int numpages);
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int set_pages_x(struct page *page, int numpages);
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int set_pages_nx(struct page *page, int numpages);
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int set_pages_ro(struct page *page, int numpages);
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int set_pages_rw(struct page *page, int numpages);
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void clflush_cache_range(void *addr, unsigned int size);
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#ifdef CONFIG_DEBUG_RODATA
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void mark_rodata_ro(void);
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extern const int rodata_test_data;
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extern int kernel_set_to_readonly;
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void set_kernel_text_rw(void);
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void set_kernel_text_ro(void);
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#else
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static inline void set_kernel_text_rw(void) { }
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static inline void set_kernel_text_ro(void) { }
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#endif
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#ifdef CONFIG_DEBUG_RODATA_TEST
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int rodata_test(void);
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#else
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static inline int rodata_test(void)
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{
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return 0;
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}
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#endif
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#endif /* _ASM_X86_CACHEFLUSH_H */
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