include/asm/set_memory.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_X86_SET_MEMORY_H
0003 #define _ASM_X86_SET_MEMORY_H
0004
0005 #include <linux/mm.h>
0006 #include <asm/page.h>
0007 #include <asm-generic/set_memory.h>
0008
0009 /*
0010  * The set_memory_* API can be used to change various attributes of a virtual
0011  * address range. The attributes include:
0012  * Cacheability  : UnCached, WriteCombining, WriteThrough, WriteBack
0013  * Executability : eXecutable, NoteXecutable
0014  * Read/Write    : ReadOnly, ReadWrite
0015  * Presence      : NotPresent
0016  * Encryption    : Encrypted, Decrypted
0017  *
0018  * Within a category, the attributes are mutually exclusive.
0019  *
0020  * The implementation of this API will take care of various aspects that
0021  * are associated with changing such attributes, such as:
0022  * - Flushing TLBs
0023  * - Flushing CPU caches
0024  * - Making sure aliases of the memory behind the mapping don't violate
0025  *   coherency rules as defined by the CPU in the system.
0026  *
0027  * What this API does not do:
0028  * - Provide exclusion between various callers - including callers that
0029  *   operation on other mappings of the same physical page
0030  * - Restore default attributes when a page is freed
0031  * - Guarantee that mappings other than the requested one are
0032  *   in any state, other than that these do not violate rules for
0033  *   the CPU you have. Do not depend on any effects on other mappings,
0034  *   CPUs other than the one you have may have more relaxed rules.
0035  * The caller is required to take care of these.
0036  */
0037
0038 int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot);
0039 int _set_memory_uc(unsigned long addr, int numpages);
0040 int _set_memory_wc(unsigned long addr, int numpages);
0041 int _set_memory_wt(unsigned long addr, int numpages);
0042 int _set_memory_wb(unsigned long addr, int numpages);
0043 int set_memory_uc(unsigned long addr, int numpages);
0044 int set_memory_wc(unsigned long addr, int numpages);
0045 int set_memory_wb(unsigned long addr, int numpages);
0046 int set_memory_np(unsigned long addr, int numpages);
0047 int set_memory_4k(unsigned long addr, int numpages);
0048 int set_memory_encrypted(unsigned long addr, int numpages);
0049 int set_memory_decrypted(unsigned long addr, int numpages);
0050 int set_memory_np_noalias(unsigned long addr, int numpages);
0051 int set_memory_nonglobal(unsigned long addr, int numpages);
0052 int set_memory_global(unsigned long addr, int numpages);
0053
0054 int set_pages_array_uc(struct page **pages, int addrinarray);
0055 int set_pages_array_wc(struct page **pages, int addrinarray);
0056 int set_pages_array_wb(struct page **pages, int addrinarray);
0057
0058 /*
0059  * For legacy compatibility with the old APIs, a few functions
0060  * are provided that work on a "struct page".
0061  * These functions operate ONLY on the 1:1 kernel mapping of the
0062  * memory that the struct page represents, and internally just
0063  * call the set_memory_* function. See the description of the
0064  * set_memory_* function for more details on conventions.
0065  *
0066  * These APIs should be considered *deprecated* and are likely going to
0067  * be removed in the future.
0068  * The reason for this is the implicit operation on the 1:1 mapping only,
0069  * making this not a generally useful API.
0070  *
0071  * Specifically, many users of the old APIs had a virtual address,
0072  * called virt_to_page() or vmalloc_to_page() on that address to
0073  * get a struct page* that the old API required.
0074  * To convert these cases, use set_memory_*() on the original
0075  * virtual address, do not use these functions.
0076  */
0077
0078 int set_pages_uc(struct page *page, int numpages);
0079 int set_pages_wb(struct page *page, int numpages);
0080 int set_pages_ro(struct page *page, int numpages);
0081 int set_pages_rw(struct page *page, int numpages);
0082
0083 int set_direct_map_invalid_noflush(struct page *page);
0084 int set_direct_map_default_noflush(struct page *page);
0085 bool kernel_page_present(struct page *page);
0086
0087 extern int kernel_set_to_readonly;
0088
0089 #endif /* _ASM_X86_SET_MEMORY_H */