1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_CACHEFLUSH_H
 3#define _ASM_X86_CACHEFLUSH_H
 4
 5/* Caches aren't brain-dead on the intel. */
 6#include <asm-generic/cacheflush.h>
 7#include <asm/special_insns.h>
 8
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 9void clflush_cache_range(void *addr, unsigned int size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10
11#endif /* _ASM_X86_CACHEFLUSH_H */

 
  1#ifndef _ASM_X86_CACHEFLUSH_H
  2#define _ASM_X86_CACHEFLUSH_H
  3
  4/* Caches aren't brain-dead on the intel. */
  5#include <asm-generic/cacheflush.h>
  6#include <asm/special_insns.h>
  7
  8/*
  9 * The set_memory_* API can be used to change various attributes of a virtual
 10 * address range. The attributes include:
 11 * Cachability   : UnCached, WriteCombining, WriteThrough, WriteBack
 12 * Executability : eXeutable, NoteXecutable
 13 * Read/Write    : ReadOnly, ReadWrite
 14 * Presence      : NotPresent
 15 *
 16 * Within a category, the attributes are mutually exclusive.
 17 *
 18 * The implementation of this API will take care of various aspects that
 19 * are associated with changing such attributes, such as:
 20 * - Flushing TLBs
 21 * - Flushing CPU caches
 22 * - Making sure aliases of the memory behind the mapping don't violate
 23 *   coherency rules as defined by the CPU in the system.
 24 *
 25 * What this API does not do:
 26 * - Provide exclusion between various callers - including callers that
 27 *   operation on other mappings of the same physical page
 28 * - Restore default attributes when a page is freed
 29 * - Guarantee that mappings other than the requested one are
 30 *   in any state, other than that these do not violate rules for
 31 *   the CPU you have. Do not depend on any effects on other mappings,
 32 *   CPUs other than the one you have may have more relaxed rules.
 33 * The caller is required to take care of these.
 34 */
 35
 36int _set_memory_uc(unsigned long addr, int numpages);
 37int _set_memory_wc(unsigned long addr, int numpages);
 38int _set_memory_wt(unsigned long addr, int numpages);
 39int _set_memory_wb(unsigned long addr, int numpages);
 40int set_memory_uc(unsigned long addr, int numpages);
 41int set_memory_wc(unsigned long addr, int numpages);
 42int set_memory_wt(unsigned long addr, int numpages);
 43int set_memory_wb(unsigned long addr, int numpages);
 44int set_memory_x(unsigned long addr, int numpages);
 45int set_memory_nx(unsigned long addr, int numpages);
 46int set_memory_ro(unsigned long addr, int numpages);
 47int set_memory_rw(unsigned long addr, int numpages);
 48int set_memory_np(unsigned long addr, int numpages);
 49int set_memory_4k(unsigned long addr, int numpages);
 50
 51int set_memory_array_uc(unsigned long *addr, int addrinarray);
 52int set_memory_array_wc(unsigned long *addr, int addrinarray);
 53int set_memory_array_wt(unsigned long *addr, int addrinarray);
 54int set_memory_array_wb(unsigned long *addr, int addrinarray);
 55
 56int set_pages_array_uc(struct page **pages, int addrinarray);
 57int set_pages_array_wc(struct page **pages, int addrinarray);
 58int set_pages_array_wt(struct page **pages, int addrinarray);
 59int set_pages_array_wb(struct page **pages, int addrinarray);
 60
 61/*
 62 * For legacy compatibility with the old APIs, a few functions
 63 * are provided that work on a "struct page".
 64 * These functions operate ONLY on the 1:1 kernel mapping of the
 65 * memory that the struct page represents, and internally just
 66 * call the set_memory_* function. See the description of the
 67 * set_memory_* function for more details on conventions.
 68 *
 69 * These APIs should be considered *deprecated* and are likely going to
 70 * be removed in the future.
 71 * The reason for this is the implicit operation on the 1:1 mapping only,
 72 * making this not a generally useful API.
 73 *
 74 * Specifically, many users of the old APIs had a virtual address,
 75 * called virt_to_page() or vmalloc_to_page() on that address to
 76 * get a struct page* that the old API required.
 77 * To convert these cases, use set_memory_*() on the original
 78 * virtual address, do not use these functions.
 79 */
 80
 81int set_pages_uc(struct page *page, int numpages);
 82int set_pages_wb(struct page *page, int numpages);
 83int set_pages_x(struct page *page, int numpages);
 84int set_pages_nx(struct page *page, int numpages);
 85int set_pages_ro(struct page *page, int numpages);
 86int set_pages_rw(struct page *page, int numpages);
 87
 88
 89void clflush_cache_range(void *addr, unsigned int size);
 90
 91#define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
 92
 93extern const int rodata_test_data;
 94extern int kernel_set_to_readonly;
 95void set_kernel_text_rw(void);
 96void set_kernel_text_ro(void);
 97
 98#ifdef CONFIG_DEBUG_RODATA_TEST
 99int rodata_test(void);
100#else
101static inline int rodata_test(void)
102{
103	return 0;
104}
105#endif
106
107#endif /* _ASM_X86_CACHEFLUSH_H */