1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_64_H
3 #define _ASM_X86_PGTABLE_64_H
5 #include <linux/const.h>
6 #include <asm/pgtable_64_types.h>
11 * This file contains the functions and defines necessary to modify and use
12 * the x86-64 page table tree.
14 #include <asm/processor.h>
15 #include <linux/bitops.h>
16 #include <linux/threads.h>
17 #include <asm/fixmap.h>
19 extern p4d_t level4_kernel_pgt
[512];
20 extern p4d_t level4_ident_pgt
[512];
21 extern pud_t level3_kernel_pgt
[512];
22 extern pud_t level3_ident_pgt
[512];
23 extern pmd_t level2_kernel_pgt
[512];
24 extern pmd_t level2_fixmap_pgt
[512];
25 extern pmd_t level2_ident_pgt
[512];
26 extern pte_t level1_fixmap_pgt
[512 * FIXMAP_PMD_NUM
];
27 extern pgd_t init_top_pgt
[];
29 #define swapper_pg_dir init_top_pgt
31 extern void paging_init(void);
32 static inline void sync_initial_page_table(void) { }
34 #define pte_ERROR(e) \
35 pr_err("%s:%d: bad pte %p(%016lx)\n", \
36 __FILE__, __LINE__, &(e), pte_val(e))
37 #define pmd_ERROR(e) \
38 pr_err("%s:%d: bad pmd %p(%016lx)\n", \
39 __FILE__, __LINE__, &(e), pmd_val(e))
40 #define pud_ERROR(e) \
41 pr_err("%s:%d: bad pud %p(%016lx)\n", \
42 __FILE__, __LINE__, &(e), pud_val(e))
44 #if CONFIG_PGTABLE_LEVELS >= 5
45 #define p4d_ERROR(e) \
46 pr_err("%s:%d: bad p4d %p(%016lx)\n", \
47 __FILE__, __LINE__, &(e), p4d_val(e))
50 #define pgd_ERROR(e) \
51 pr_err("%s:%d: bad pgd %p(%016lx)\n", \
52 __FILE__, __LINE__, &(e), pgd_val(e))
56 void set_pte_vaddr_p4d(p4d_t
*p4d_page
, unsigned long vaddr
, pte_t new_pte
);
57 void set_pte_vaddr_pud(pud_t
*pud_page
, unsigned long vaddr
, pte_t new_pte
);
59 static inline void native_set_pte(pte_t
*ptep
, pte_t pte
)
61 WRITE_ONCE(*ptep
, pte
);
64 static inline void native_pte_clear(struct mm_struct
*mm
, unsigned long addr
,
67 native_set_pte(ptep
, native_make_pte(0));
70 static inline void native_set_pte_atomic(pte_t
*ptep
, pte_t pte
)
72 native_set_pte(ptep
, pte
);
75 static inline void native_set_pmd(pmd_t
*pmdp
, pmd_t pmd
)
77 WRITE_ONCE(*pmdp
, pmd
);
80 static inline void native_pmd_clear(pmd_t
*pmd
)
82 native_set_pmd(pmd
, native_make_pmd(0));
85 static inline pte_t
native_ptep_get_and_clear(pte_t
*xp
)
88 return native_make_pte(xchg(&xp
->pte
, 0));
90 /* native_local_ptep_get_and_clear,
91 but duplicated because of cyclic dependency */
93 native_pte_clear(NULL
, 0, xp
);
98 static inline pmd_t
native_pmdp_get_and_clear(pmd_t
*xp
)
101 return native_make_pmd(xchg(&xp
->pmd
, 0));
103 /* native_local_pmdp_get_and_clear,
104 but duplicated because of cyclic dependency */
106 native_pmd_clear(xp
);
111 static inline void native_set_pud(pud_t
*pudp
, pud_t pud
)
113 WRITE_ONCE(*pudp
, pud
);
116 static inline void native_pud_clear(pud_t
*pud
)
118 native_set_pud(pud
, native_make_pud(0));
121 static inline pud_t
native_pudp_get_and_clear(pud_t
*xp
)
124 return native_make_pud(xchg(&xp
->pud
, 0));
126 /* native_local_pudp_get_and_clear,
127 * but duplicated because of cyclic dependency
131 native_pud_clear(xp
);
136 static inline void native_set_p4d(p4d_t
*p4dp
, p4d_t p4d
)
140 if (pgtable_l5_enabled() || !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION
)) {
141 WRITE_ONCE(*p4dp
, p4d
);
145 pgd
= native_make_pgd(native_p4d_val(p4d
));
146 pgd
= pti_set_user_pgtbl((pgd_t
*)p4dp
, pgd
);
147 WRITE_ONCE(*p4dp
, native_make_p4d(native_pgd_val(pgd
)));
150 static inline void native_p4d_clear(p4d_t
*p4d
)
152 native_set_p4d(p4d
, native_make_p4d(0));
155 static inline void native_set_pgd(pgd_t
*pgdp
, pgd_t pgd
)
157 WRITE_ONCE(*pgdp
, pti_set_user_pgtbl(pgdp
, pgd
));
160 static inline void native_pgd_clear(pgd_t
*pgd
)
162 native_set_pgd(pgd
, native_make_pgd(0));
165 extern void sync_global_pgds(unsigned long start
, unsigned long end
);
168 * Conversion functions: convert a page and protection to a page entry,
169 * and a page entry and page directory to the page they refer to.
175 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
177 /* PUD - Level3 access */
179 /* PMD - Level 2 access */
181 /* PTE - Level 1 access. */
183 /* x86-64 always has all page tables mapped. */
184 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
185 #define pte_unmap(pte) ((void)(pte))/* NOP */
188 * Encode and de-code a swap entry
190 * | ... | 11| 10| 9|8|7|6|5| 4| 3|2| 1|0| <- bit number
191 * | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
192 * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| X|X|SD|0| <- swp entry
194 * G (8) is aliased and used as a PROT_NONE indicator for
195 * !present ptes. We need to start storing swap entries above
196 * there. We also need to avoid using A and D because of an
197 * erratum where they can be incorrectly set by hardware on
200 * SD (1) in swp entry is used to store soft dirty bit, which helps us
201 * remember soft dirty over page migration
203 * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
206 * The offset is inverted by a binary not operation to make the high
209 #define SWP_TYPE_BITS 5
211 #define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
213 /* We always extract/encode the offset by shifting it all the way up, and then down again */
214 #define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS)
216 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
218 /* Extract the high bits for type */
219 #define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
221 /* Shift up (to get rid of type), then down to get value */
222 #define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT)
225 * Shift the offset up "too far" by TYPE bits, then down again
226 * The offset is inverted by a binary not operation to make the high
229 #define __swp_entry(type, offset) ((swp_entry_t) { \
230 (~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
231 | ((unsigned long)(type) << (64-SWP_TYPE_BITS)) })
233 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
234 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val((pmd)) })
235 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
236 #define __swp_entry_to_pmd(x) ((pmd_t) { .pmd = (x).val })
238 extern int kern_addr_valid(unsigned long addr
);
239 extern void cleanup_highmap(void);
241 #define HAVE_ARCH_UNMAPPED_AREA
242 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
244 #define pgtable_cache_init() do { } while (0)
245 #define check_pgt_cache() do { } while (0)
247 #define PAGE_AGP PAGE_KERNEL_NOCACHE
248 #define HAVE_PAGE_AGP 1
250 /* fs/proc/kcore.c */
251 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
252 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
254 #define __HAVE_ARCH_PTE_SAME
256 #define vmemmap ((struct page *)VMEMMAP_START)
258 extern void init_extra_mapping_uc(unsigned long phys
, unsigned long size
);
259 extern void init_extra_mapping_wb(unsigned long phys
, unsigned long size
);
261 #define gup_fast_permitted gup_fast_permitted
262 static inline bool gup_fast_permitted(unsigned long start
, int nr_pages
,
265 unsigned long len
, end
;
267 len
= (unsigned long)nr_pages
<< PAGE_SHIFT
;
271 if (end
>> __VIRTUAL_MASK_SHIFT
)
276 #include <asm/pgtable-invert.h>
278 #endif /* !__ASSEMBLY__ */
279 #endif /* _ASM_X86_PGTABLE_64_H */