1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_CACHEFLUSH_H
 3#define _ASM_X86_CACHEFLUSH_H
 4
 5#include <linux/mm.h>
 6
 7/* Caches aren't brain-dead on the intel. */
 8#include <asm-generic/cacheflush.h>
 9#include <asm/special_insns.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10
11void clflush_cache_range(void *addr, unsigned int size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12
13#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#include <asm/uaccess.h>
  8
  9/*
 10 * The set_memory_* API can be used to change various attributes of a virtual
 11 * address range. The attributes include:
 12 * Cachability   : UnCached, WriteCombining, WriteThrough, WriteBack
 13 * Executability : eXeutable, NoteXecutable
 14 * Read/Write    : ReadOnly, ReadWrite
 15 * Presence      : NotPresent
 16 *
 17 * Within a category, the attributes are mutually exclusive.
 18 *
 19 * The implementation of this API will take care of various aspects that
 20 * are associated with changing such attributes, such as:
 21 * - Flushing TLBs
 22 * - Flushing CPU caches
 23 * - Making sure aliases of the memory behind the mapping don't violate
 24 *   coherency rules as defined by the CPU in the system.
 25 *
 26 * What this API does not do:
 27 * - Provide exclusion between various callers - including callers that
 28 *   operation on other mappings of the same physical page
 29 * - Restore default attributes when a page is freed
 30 * - Guarantee that mappings other than the requested one are
 31 *   in any state, other than that these do not violate rules for
 32 *   the CPU you have. Do not depend on any effects on other mappings,
 33 *   CPUs other than the one you have may have more relaxed rules.
 34 * The caller is required to take care of these.
 35 */
 36
 37int _set_memory_uc(unsigned long addr, int numpages);
 38int _set_memory_wc(unsigned long addr, int numpages);
 39int _set_memory_wt(unsigned long addr, int numpages);
 40int _set_memory_wb(unsigned long addr, int numpages);
 41int set_memory_uc(unsigned long addr, int numpages);
 42int set_memory_wc(unsigned long addr, int numpages);
 43int set_memory_wt(unsigned long addr, int numpages);
 44int set_memory_wb(unsigned long addr, int numpages);
 45int set_memory_x(unsigned long addr, int numpages);
 46int set_memory_nx(unsigned long addr, int numpages);
 47int set_memory_ro(unsigned long addr, int numpages);
 48int set_memory_rw(unsigned long addr, int numpages);
 49int set_memory_np(unsigned long addr, int numpages);
 50int set_memory_4k(unsigned long addr, int numpages);
 51
 52int set_memory_array_uc(unsigned long *addr, int addrinarray);
 53int set_memory_array_wc(unsigned long *addr, int addrinarray);
 54int set_memory_array_wt(unsigned long *addr, int addrinarray);
 55int set_memory_array_wb(unsigned long *addr, int addrinarray);
 56
 57int set_pages_array_uc(struct page **pages, int addrinarray);
 58int set_pages_array_wc(struct page **pages, int addrinarray);
 59int set_pages_array_wt(struct page **pages, int addrinarray);
 60int set_pages_array_wb(struct page **pages, int addrinarray);
 61
 62/*
 63 * For legacy compatibility with the old APIs, a few functions
 64 * are provided that work on a "struct page".
 65 * These functions operate ONLY on the 1:1 kernel mapping of the
 66 * memory that the struct page represents, and internally just
 67 * call the set_memory_* function. See the description of the
 68 * set_memory_* function for more details on conventions.
 69 *
 70 * These APIs should be considered *deprecated* and are likely going to
 71 * be removed in the future.
 72 * The reason for this is the implicit operation on the 1:1 mapping only,
 73 * making this not a generally useful API.
 74 *
 75 * Specifically, many users of the old APIs had a virtual address,
 76 * called virt_to_page() or vmalloc_to_page() on that address to
 77 * get a struct page* that the old API required.
 78 * To convert these cases, use set_memory_*() on the original
 79 * virtual address, do not use these functions.
 80 */
 81
 82int set_pages_uc(struct page *page, int numpages);
 83int set_pages_wb(struct page *page, int numpages);
 84int set_pages_x(struct page *page, int numpages);
 85int set_pages_nx(struct page *page, int numpages);
 86int set_pages_ro(struct page *page, int numpages);
 87int set_pages_rw(struct page *page, int numpages);
 88
 89
 90void clflush_cache_range(void *addr, unsigned int size);
 91
 92#define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
 93
 94extern const int rodata_test_data;
 95extern int kernel_set_to_readonly;
 96void set_kernel_text_rw(void);
 97void set_kernel_text_ro(void);
 98
 99#ifdef CONFIG_DEBUG_RODATA_TEST
100int rodata_test(void);
101#else
102static inline int rodata_test(void)
103{
104	return 0;
105}
106#endif
107
108#endif /* _ASM_X86_CACHEFLUSH_H */