1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PGTABLE_DEFS_H
3#define _ASM_X86_PGTABLE_DEFS_H
4
5#include <linux/const.h>
6#include <linux/mem_encrypt.h>
7
8#include <asm/page_types.h>
9
10#define FIRST_USER_ADDRESS 0UL
11
12#define _PAGE_BIT_PRESENT 0 /* is present */
13#define _PAGE_BIT_RW 1 /* writeable */
14#define _PAGE_BIT_USER 2 /* userspace addressable */
15#define _PAGE_BIT_PWT 3 /* page write through */
16#define _PAGE_BIT_PCD 4 /* page cache disabled */
17#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
18#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
19#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
20#define _PAGE_BIT_PAT 7 /* on 4KB pages */
21#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
22#define _PAGE_BIT_SOFTW1 9 /* available for programmer */
23#define _PAGE_BIT_SOFTW2 10 /* " */
24#define _PAGE_BIT_SOFTW3 11 /* " */
25#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
26#define _PAGE_BIT_SOFTW4 58 /* available for programmer */
27#define _PAGE_BIT_PKEY_BIT0 59 /* Protection Keys, bit 1/4 */
28#define _PAGE_BIT_PKEY_BIT1 60 /* Protection Keys, bit 2/4 */
29#define _PAGE_BIT_PKEY_BIT2 61 /* Protection Keys, bit 3/4 */
30#define _PAGE_BIT_PKEY_BIT3 62 /* Protection Keys, bit 4/4 */
31#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
32
33#define _PAGE_BIT_SPECIAL _PAGE_BIT_SOFTW1
34#define _PAGE_BIT_CPA_TEST _PAGE_BIT_SOFTW1
35#define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
36#define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4
37
38/* If _PAGE_BIT_PRESENT is clear, we use these: */
39/* - if the user mapped it with PROT_NONE; pte_present gives true */
40#define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
41
42#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
43#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
44#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
45#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
46#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
47#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
48#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
49#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
50#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
51#define _PAGE_SOFTW1 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
52#define _PAGE_SOFTW2 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
53#define _PAGE_SOFTW3 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW3)
54#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
55#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
56#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
57#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
58#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
59#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
60#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
61#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
62#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
63#else
64#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
65#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
66#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
67#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
68#endif
69
70#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
71 _PAGE_PKEY_BIT1 | \
72 _PAGE_PKEY_BIT2 | \
73 _PAGE_PKEY_BIT3)
74
75#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
76#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
77#else
78#define _PAGE_KNL_ERRATUM_MASK 0
79#endif
80
81#ifdef CONFIG_MEM_SOFT_DIRTY
82#define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
83#else
84#define _PAGE_SOFT_DIRTY (_AT(pteval_t, 0))
85#endif
86
87/*
88 * Tracking soft dirty bit when a page goes to a swap is tricky.
89 * We need a bit which can be stored in pte _and_ not conflict
90 * with swap entry format. On x86 bits 1-4 are *not* involved
91 * into swap entry computation, but bit 7 is used for thp migration,
92 * so we borrow bit 1 for soft dirty tracking.
93 *
94 * Please note that this bit must be treated as swap dirty page
95 * mark if and only if the PTE/PMD has present bit clear!
96 */
97#ifdef CONFIG_MEM_SOFT_DIRTY
98#define _PAGE_SWP_SOFT_DIRTY _PAGE_RW
99#else
100#define _PAGE_SWP_SOFT_DIRTY (_AT(pteval_t, 0))
101#endif
102
103#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
104#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
105#define _PAGE_DEVMAP (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
106#define __HAVE_ARCH_PTE_DEVMAP
107#else
108#define _PAGE_NX (_AT(pteval_t, 0))
109#define _PAGE_DEVMAP (_AT(pteval_t, 0))
110#endif
111
112#define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
113
114#define _PAGE_TABLE_NOENC (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |\
115 _PAGE_ACCESSED | _PAGE_DIRTY)
116#define _KERNPG_TABLE_NOENC (_PAGE_PRESENT | _PAGE_RW | \
117 _PAGE_ACCESSED | _PAGE_DIRTY)
118
119/*
120 * Set of bits not changed in pte_modify. The pte's
121 * protection key is treated like _PAGE_RW, for
122 * instance, and is *not* included in this mask since
123 * pte_modify() does modify it.
124 */
125#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
126 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
127 _PAGE_SOFT_DIRTY)
128#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
129
130/*
131 * The cache modes defined here are used to translate between pure SW usage
132 * and the HW defined cache mode bits and/or PAT entries.
133 *
134 * The resulting bits for PWT, PCD and PAT should be chosen in a way
135 * to have the WB mode at index 0 (all bits clear). This is the default
136 * right now and likely would break too much if changed.
137 */
138#ifndef __ASSEMBLY__
139enum page_cache_mode {
140 _PAGE_CACHE_MODE_WB = 0,
141 _PAGE_CACHE_MODE_WC = 1,
142 _PAGE_CACHE_MODE_UC_MINUS = 2,
143 _PAGE_CACHE_MODE_UC = 3,
144 _PAGE_CACHE_MODE_WT = 4,
145 _PAGE_CACHE_MODE_WP = 5,
146 _PAGE_CACHE_MODE_NUM = 8
147};
148#endif
149
150#define _PAGE_CACHE_MASK (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
151#define _PAGE_NOCACHE (cachemode2protval(_PAGE_CACHE_MODE_UC))
152#define _PAGE_CACHE_WP (cachemode2protval(_PAGE_CACHE_MODE_WP))
153
154#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
155#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
156 _PAGE_ACCESSED | _PAGE_NX)
157
158#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
159 _PAGE_USER | _PAGE_ACCESSED)
160#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
161 _PAGE_ACCESSED | _PAGE_NX)
162#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
163 _PAGE_ACCESSED)
164#define PAGE_COPY PAGE_COPY_NOEXEC
165#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
166 _PAGE_ACCESSED | _PAGE_NX)
167#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
168 _PAGE_ACCESSED)
169
170#define __PAGE_KERNEL_EXEC \
171 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
172#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
173
174#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
175#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
176#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_NOCACHE)
177#define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO | _PAGE_USER)
178#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
179#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
180#define __PAGE_KERNEL_WP (__PAGE_KERNEL | _PAGE_CACHE_WP)
181
182#define __PAGE_KERNEL_IO (__PAGE_KERNEL)
183#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE)
184
185#ifndef __ASSEMBLY__
186
187#define _PAGE_ENC (_AT(pteval_t, sme_me_mask))
188
189#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
190 _PAGE_DIRTY | _PAGE_ENC)
191#define _PAGE_TABLE (_KERNPG_TABLE | _PAGE_USER)
192
193#define __PAGE_KERNEL_ENC (__PAGE_KERNEL | _PAGE_ENC)
194#define __PAGE_KERNEL_ENC_WP (__PAGE_KERNEL_WP | _PAGE_ENC)
195
196#define __PAGE_KERNEL_NOENC (__PAGE_KERNEL)
197#define __PAGE_KERNEL_NOENC_WP (__PAGE_KERNEL_WP)
198
199#define default_pgprot(x) __pgprot((x) & __default_kernel_pte_mask)
200
201#define PAGE_KERNEL default_pgprot(__PAGE_KERNEL | _PAGE_ENC)
202#define PAGE_KERNEL_NOENC default_pgprot(__PAGE_KERNEL)
203#define PAGE_KERNEL_RO default_pgprot(__PAGE_KERNEL_RO | _PAGE_ENC)
204#define PAGE_KERNEL_EXEC default_pgprot(__PAGE_KERNEL_EXEC | _PAGE_ENC)
205#define PAGE_KERNEL_EXEC_NOENC default_pgprot(__PAGE_KERNEL_EXEC)
206#define PAGE_KERNEL_RX default_pgprot(__PAGE_KERNEL_RX | _PAGE_ENC)
207#define PAGE_KERNEL_NOCACHE default_pgprot(__PAGE_KERNEL_NOCACHE | _PAGE_ENC)
208#define PAGE_KERNEL_LARGE default_pgprot(__PAGE_KERNEL_LARGE | _PAGE_ENC)
209#define PAGE_KERNEL_LARGE_EXEC default_pgprot(__PAGE_KERNEL_LARGE_EXEC | _PAGE_ENC)
210#define PAGE_KERNEL_VVAR default_pgprot(__PAGE_KERNEL_VVAR | _PAGE_ENC)
211
212#define PAGE_KERNEL_IO default_pgprot(__PAGE_KERNEL_IO)
213#define PAGE_KERNEL_IO_NOCACHE default_pgprot(__PAGE_KERNEL_IO_NOCACHE)
214
215#endif /* __ASSEMBLY__ */
216
217/* xwr */
218#define __P000 PAGE_NONE
219#define __P001 PAGE_READONLY
220#define __P010 PAGE_COPY
221#define __P011 PAGE_COPY
222#define __P100 PAGE_READONLY_EXEC
223#define __P101 PAGE_READONLY_EXEC
224#define __P110 PAGE_COPY_EXEC
225#define __P111 PAGE_COPY_EXEC
226
227#define __S000 PAGE_NONE
228#define __S001 PAGE_READONLY
229#define __S010 PAGE_SHARED
230#define __S011 PAGE_SHARED
231#define __S100 PAGE_READONLY_EXEC
232#define __S101 PAGE_READONLY_EXEC
233#define __S110 PAGE_SHARED_EXEC
234#define __S111 PAGE_SHARED_EXEC
235
236/*
237 * early identity mapping pte attrib macros.
238 */
239#ifdef CONFIG_X86_64
240#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
241#else
242#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
243#define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
244#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
245#endif
246
247#ifdef CONFIG_X86_32
248# include <asm/pgtable_32_types.h>
249#else
250# include <asm/pgtable_64_types.h>
251#endif
252
253#ifndef __ASSEMBLY__
254
255#include <linux/types.h>
256
257/* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
258#define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
259
260/*
261 * Extracts the flags from a (pte|pmd|pud|pgd)val_t
262 * This includes the protection key value.
263 */
264#define PTE_FLAGS_MASK (~PTE_PFN_MASK)
265
266typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
267
268typedef struct { pgdval_t pgd; } pgd_t;
269
270#ifdef CONFIG_X86_PAE
271
272/*
273 * PHYSICAL_PAGE_MASK might be non-constant when SME is compiled in, so we can't
274 * use it here.
275 */
276
277#define PGD_PAE_PAGE_MASK ((signed long)PAGE_MASK)
278#define PGD_PAE_PHYS_MASK (((1ULL << __PHYSICAL_MASK_SHIFT)-1) & PGD_PAE_PAGE_MASK)
279
280/*
281 * PAE allows Base Address, P, PWT, PCD and AVL bits to be set in PGD entries.
282 * All other bits are Reserved MBZ
283 */
284#define PGD_ALLOWED_BITS (PGD_PAE_PHYS_MASK | _PAGE_PRESENT | \
285 _PAGE_PWT | _PAGE_PCD | \
286 _PAGE_SOFTW1 | _PAGE_SOFTW2 | _PAGE_SOFTW3)
287
288#else
289/* No need to mask any bits for !PAE */
290#define PGD_ALLOWED_BITS (~0ULL)
291#endif
292
293static inline pgd_t native_make_pgd(pgdval_t val)
294{
295 return (pgd_t) { val & PGD_ALLOWED_BITS };
296}
297
298static inline pgdval_t native_pgd_val(pgd_t pgd)
299{
300 return pgd.pgd & PGD_ALLOWED_BITS;
301}
302
303static inline pgdval_t pgd_flags(pgd_t pgd)
304{
305 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
306}
307
308#if CONFIG_PGTABLE_LEVELS > 4
309typedef struct { p4dval_t p4d; } p4d_t;
310
311static inline p4d_t native_make_p4d(pudval_t val)
312{
313 return (p4d_t) { val };
314}
315
316static inline p4dval_t native_p4d_val(p4d_t p4d)
317{
318 return p4d.p4d;
319}
320#else
321#include <asm-generic/pgtable-nop4d.h>
322
323static inline p4d_t native_make_p4d(pudval_t val)
324{
325 return (p4d_t) { .pgd = native_make_pgd((pgdval_t)val) };
326}
327
328static inline p4dval_t native_p4d_val(p4d_t p4d)
329{
330 return native_pgd_val(p4d.pgd);
331}
332#endif
333
334#if CONFIG_PGTABLE_LEVELS > 3
335typedef struct { pudval_t pud; } pud_t;
336
337static inline pud_t native_make_pud(pmdval_t val)
338{
339 return (pud_t) { val };
340}
341
342static inline pudval_t native_pud_val(pud_t pud)
343{
344 return pud.pud;
345}
346#else
347#include <asm-generic/pgtable-nopud.h>
348
349static inline pud_t native_make_pud(pudval_t val)
350{
351 return (pud_t) { .p4d.pgd = native_make_pgd(val) };
352}
353
354static inline pudval_t native_pud_val(pud_t pud)
355{
356 return native_pgd_val(pud.p4d.pgd);
357}
358#endif
359
360#if CONFIG_PGTABLE_LEVELS > 2
361typedef struct { pmdval_t pmd; } pmd_t;
362
363static inline pmd_t native_make_pmd(pmdval_t val)
364{
365 return (pmd_t) { val };
366}
367
368static inline pmdval_t native_pmd_val(pmd_t pmd)
369{
370 return pmd.pmd;
371}
372#else
373#include <asm-generic/pgtable-nopmd.h>
374
375static inline pmd_t native_make_pmd(pmdval_t val)
376{
377 return (pmd_t) { .pud.p4d.pgd = native_make_pgd(val) };
378}
379
380static inline pmdval_t native_pmd_val(pmd_t pmd)
381{
382 return native_pgd_val(pmd.pud.p4d.pgd);
383}
384#endif
385
386static inline p4dval_t p4d_pfn_mask(p4d_t p4d)
387{
388 /* No 512 GiB huge pages yet */
389 return PTE_PFN_MASK;
390}
391
392static inline p4dval_t p4d_flags_mask(p4d_t p4d)
393{
394 return ~p4d_pfn_mask(p4d);
395}
396
397static inline p4dval_t p4d_flags(p4d_t p4d)
398{
399 return native_p4d_val(p4d) & p4d_flags_mask(p4d);
400}
401
402static inline pudval_t pud_pfn_mask(pud_t pud)
403{
404 if (native_pud_val(pud) & _PAGE_PSE)
405 return PHYSICAL_PUD_PAGE_MASK;
406 else
407 return PTE_PFN_MASK;
408}
409
410static inline pudval_t pud_flags_mask(pud_t pud)
411{
412 return ~pud_pfn_mask(pud);
413}
414
415static inline pudval_t pud_flags(pud_t pud)
416{
417 return native_pud_val(pud) & pud_flags_mask(pud);
418}
419
420static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
421{
422 if (native_pmd_val(pmd) & _PAGE_PSE)
423 return PHYSICAL_PMD_PAGE_MASK;
424 else
425 return PTE_PFN_MASK;
426}
427
428static inline pmdval_t pmd_flags_mask(pmd_t pmd)
429{
430 return ~pmd_pfn_mask(pmd);
431}
432
433static inline pmdval_t pmd_flags(pmd_t pmd)
434{
435 return native_pmd_val(pmd) & pmd_flags_mask(pmd);
436}
437
438static inline pte_t native_make_pte(pteval_t val)
439{
440 return (pte_t) { .pte = val };
441}
442
443static inline pteval_t native_pte_val(pte_t pte)
444{
445 return pte.pte;
446}
447
448static inline pteval_t pte_flags(pte_t pte)
449{
450 return native_pte_val(pte) & PTE_FLAGS_MASK;
451}
452
453#define pgprot_val(x) ((x).pgprot)
454#define __pgprot(x) ((pgprot_t) { (x) } )
455
456extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
457extern uint8_t __pte2cachemode_tbl[8];
458
459#define __pte2cm_idx(cb) \
460 ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) | \
461 (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) | \
462 (((cb) >> _PAGE_BIT_PWT) & 1))
463#define __cm_idx2pte(i) \
464 ((((i) & 4) << (_PAGE_BIT_PAT - 2)) | \
465 (((i) & 2) << (_PAGE_BIT_PCD - 1)) | \
466 (((i) & 1) << _PAGE_BIT_PWT))
467
468static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
469{
470 if (likely(pcm == 0))
471 return 0;
472 return __cachemode2pte_tbl[pcm];
473}
474static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
475{
476 return __pgprot(cachemode2protval(pcm));
477}
478static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
479{
480 unsigned long masked;
481
482 masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
483 if (likely(masked == 0))
484 return 0;
485 return __pte2cachemode_tbl[__pte2cm_idx(masked)];
486}
487static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
488{
489 pgprotval_t val = pgprot_val(pgprot);
490 pgprot_t new;
491
492 pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
493 ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
494 return new;
495}
496static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
497{
498 pgprotval_t val = pgprot_val(pgprot);
499 pgprot_t new;
500
501 pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
502 ((val & _PAGE_PAT_LARGE) >>
503 (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
504 return new;
505}
506
507
508typedef struct page *pgtable_t;
509
510extern pteval_t __supported_pte_mask;
511extern pteval_t __default_kernel_pte_mask;
512extern void set_nx(void);
513extern int nx_enabled;
514
515#define pgprot_writecombine pgprot_writecombine
516extern pgprot_t pgprot_writecombine(pgprot_t prot);
517
518#define pgprot_writethrough pgprot_writethrough
519extern pgprot_t pgprot_writethrough(pgprot_t prot);
520
521/* Indicate that x86 has its own track and untrack pfn vma functions */
522#define __HAVE_PFNMAP_TRACKING
523
524#define __HAVE_PHYS_MEM_ACCESS_PROT
525struct file;
526pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
527 unsigned long size, pgprot_t vma_prot);
528
529/* Install a pte for a particular vaddr in kernel space. */
530void set_pte_vaddr(unsigned long vaddr, pte_t pte);
531
532#ifdef CONFIG_X86_32
533extern void native_pagetable_init(void);
534#else
535#define native_pagetable_init paging_init
536#endif
537
538struct seq_file;
539extern void arch_report_meminfo(struct seq_file *m);
540
541enum pg_level {
542 PG_LEVEL_NONE,
543 PG_LEVEL_4K,
544 PG_LEVEL_2M,
545 PG_LEVEL_1G,
546 PG_LEVEL_512G,
547 PG_LEVEL_NUM
548};
549
550#ifdef CONFIG_PROC_FS
551extern void update_page_count(int level, unsigned long pages);
552#else
553static inline void update_page_count(int level, unsigned long pages) { }
554#endif
555
556/*
557 * Helper function that returns the kernel pagetable entry controlling
558 * the virtual address 'address'. NULL means no pagetable entry present.
559 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
560 * as a pte too.
561 */
562extern pte_t *lookup_address(unsigned long address, unsigned int *level);
563extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
564 unsigned int *level);
565extern pmd_t *lookup_pmd_address(unsigned long address);
566extern phys_addr_t slow_virt_to_phys(void *__address);
567extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
568 unsigned numpages, unsigned long page_flags);
569#endif /* !__ASSEMBLY__ */
570
571#endif /* _ASM_X86_PGTABLE_DEFS_H */
572