1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_DEFS_H
3 #define _ASM_X86_PGTABLE_DEFS_H
5 #include <linux/const.h>
6 #include <linux/mem_encrypt.h>
8 #include <asm/page_types.h>
10 #define _PAGE_BIT_PRESENT 0 /* is present */
11 #define _PAGE_BIT_RW 1 /* writeable */
12 #define _PAGE_BIT_USER 2 /* userspace addressable */
13 #define _PAGE_BIT_PWT 3 /* page write through */
14 #define _PAGE_BIT_PCD 4 /* page cache disabled */
15 #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
16 #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
17 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
18 #define _PAGE_BIT_PAT 7 /* on 4KB pages */
19 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
20 #define _PAGE_BIT_SOFTW1 9 /* available for programmer */
21 #define _PAGE_BIT_SOFTW2 10 /* " */
22 #define _PAGE_BIT_SOFTW3 11 /* " */
23 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
24 #define _PAGE_BIT_SOFTW4 57 /* available for programmer */
25 #define _PAGE_BIT_SOFTW5 58 /* available for programmer */
26 #define _PAGE_BIT_PKEY_BIT0 59 /* Protection Keys, bit 1/4 */
27 #define _PAGE_BIT_PKEY_BIT1 60 /* Protection Keys, bit 2/4 */
28 #define _PAGE_BIT_PKEY_BIT2 61 /* Protection Keys, bit 3/4 */
29 #define _PAGE_BIT_PKEY_BIT3 62 /* Protection Keys, bit 4/4 */
30 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
32 #define _PAGE_BIT_SPECIAL _PAGE_BIT_SOFTW1
33 #define _PAGE_BIT_CPA_TEST _PAGE_BIT_SOFTW1
34 #define _PAGE_BIT_UFFD_WP _PAGE_BIT_SOFTW2 /* userfaultfd wrprotected */
35 #define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
36 #define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4
39 #define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW5 /* Saved Dirty bit */
41 /* Shared with _PAGE_BIT_UFFD_WP which is not supported on 32 bit */
42 #define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW2 /* Saved Dirty bit */
45 /* If _PAGE_BIT_PRESENT is clear, we use these: */
46 /* - if the user mapped it with PROT_NONE; pte_present gives true */
47 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
49 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
50 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
51 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
52 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
53 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
54 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
55 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
56 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
57 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
58 #define _PAGE_SOFTW1 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
59 #define _PAGE_SOFTW2 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
60 #define _PAGE_SOFTW3 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW3)
61 #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
62 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
63 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
64 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
65 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
66 #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
67 #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
68 #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
69 #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
71 #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
72 #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
73 #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
74 #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
77 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
82 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
83 #define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
85 #define _PAGE_KNL_ERRATUM_MASK 0
88 #ifdef CONFIG_MEM_SOFT_DIRTY
89 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
91 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 0))
95 * Tracking soft dirty bit when a page goes to a swap is tricky.
96 * We need a bit which can be stored in pte _and_ not conflict
97 * with swap entry format. On x86 bits 1-4 are *not* involved
98 * into swap entry computation, but bit 7 is used for thp migration,
99 * so we borrow bit 1 for soft dirty tracking.
101 * Please note that this bit must be treated as swap dirty page
102 * mark if and only if the PTE/PMD has present bit clear!
104 #ifdef CONFIG_MEM_SOFT_DIRTY
105 #define _PAGE_SWP_SOFT_DIRTY _PAGE_RW
107 #define _PAGE_SWP_SOFT_DIRTY (_AT(pteval_t, 0))
110 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
111 #define _PAGE_UFFD_WP (_AT(pteval_t, 1) << _PAGE_BIT_UFFD_WP)
112 #define _PAGE_SWP_UFFD_WP _PAGE_USER
114 #define _PAGE_UFFD_WP (_AT(pteval_t, 0))
115 #define _PAGE_SWP_UFFD_WP (_AT(pteval_t, 0))
118 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
119 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
120 #define _PAGE_DEVMAP (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
121 #define _PAGE_SOFTW4 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW4)
123 #define _PAGE_NX (_AT(pteval_t, 0))
124 #define _PAGE_DEVMAP (_AT(pteval_t, 0))
125 #define _PAGE_SOFTW4 (_AT(pteval_t, 0))
129 * The hardware requires shadow stack to be Write=0,Dirty=1. However,
130 * there are valid cases where the kernel might create read-only PTEs that
131 * are dirty (e.g., fork(), mprotect(), uffd-wp(), soft-dirty tracking). In
132 * this case, the _PAGE_SAVED_DIRTY bit is used instead of the HW-dirty bit,
133 * to avoid creating a wrong "shadow stack" PTEs. Such PTEs have
134 * (Write=0,SavedDirty=1,Dirty=0) set.
136 #define _PAGE_SAVED_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SAVED_DIRTY)
138 #define _PAGE_DIRTY_BITS (_PAGE_DIRTY | _PAGE_SAVED_DIRTY)
140 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
143 * Set of bits not changed in pte_modify. The pte's
144 * protection key is treated like _PAGE_RW, for
145 * instance, and is *not* included in this mask since
146 * pte_modify() does modify it.
148 #define _COMMON_PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
149 _PAGE_SPECIAL | _PAGE_ACCESSED | \
150 _PAGE_DIRTY_BITS | _PAGE_SOFT_DIRTY | \
151 _PAGE_DEVMAP | _PAGE_ENC | _PAGE_UFFD_WP)
152 #define _PAGE_CHG_MASK (_COMMON_PAGE_CHG_MASK | _PAGE_PAT)
153 #define _HPAGE_CHG_MASK (_COMMON_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_PAT_LARGE)
156 * The cache modes defined here are used to translate between pure SW usage
157 * and the HW defined cache mode bits and/or PAT entries.
159 * The resulting bits for PWT, PCD and PAT should be chosen in a way
160 * to have the WB mode at index 0 (all bits clear). This is the default
161 * right now and likely would break too much if changed.
164 enum page_cache_mode {
165 _PAGE_CACHE_MODE_WB = 0,
166 _PAGE_CACHE_MODE_WC = 1,
167 _PAGE_CACHE_MODE_UC_MINUS = 2,
168 _PAGE_CACHE_MODE_UC = 3,
169 _PAGE_CACHE_MODE_WT = 4,
170 _PAGE_CACHE_MODE_WP = 5,
172 _PAGE_CACHE_MODE_NUM = 8
176 #define _PAGE_ENC (_AT(pteval_t, sme_me_mask))
178 #define _PAGE_CACHE_MASK (_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)
179 #define _PAGE_LARGE_CACHE_MASK (_PAGE_PWT | _PAGE_PCD | _PAGE_PAT_LARGE)
181 #define _PAGE_NOCACHE (cachemode2protval(_PAGE_CACHE_MODE_UC))
182 #define _PAGE_CACHE_WP (cachemode2protval(_PAGE_CACHE_MODE_WP))
184 #define __PP _PAGE_PRESENT
185 #define __RW _PAGE_RW
186 #define _USR _PAGE_USER
187 #define ___A _PAGE_ACCESSED
188 #define ___D _PAGE_DIRTY
189 #define ___G _PAGE_GLOBAL
190 #define __NX _PAGE_NX
192 #define _ENC _PAGE_ENC
193 #define __WP _PAGE_CACHE_WP
194 #define __NC _PAGE_NOCACHE
195 #define _PSE _PAGE_PSE
197 #define pgprot_val(x) ((x).pgprot)
198 #define __pgprot(x) ((pgprot_t) { (x) } )
199 #define __pg(x) __pgprot(x)
201 #define PAGE_NONE __pg( 0| 0| 0|___A| 0| 0| 0|___G)
202 #define PAGE_SHARED __pg(__PP|__RW|_USR|___A|__NX| 0| 0| 0)
203 #define PAGE_SHARED_EXEC __pg(__PP|__RW|_USR|___A| 0| 0| 0| 0)
204 #define PAGE_COPY_NOEXEC __pg(__PP| 0|_USR|___A|__NX| 0| 0| 0)
205 #define PAGE_COPY_EXEC __pg(__PP| 0|_USR|___A| 0| 0| 0| 0)
206 #define PAGE_COPY __pg(__PP| 0|_USR|___A|__NX| 0| 0| 0)
207 #define PAGE_READONLY __pg(__PP| 0|_USR|___A|__NX| 0| 0| 0)
208 #define PAGE_READONLY_EXEC __pg(__PP| 0|_USR|___A| 0| 0| 0| 0)
210 #define __PAGE_KERNEL (__PP|__RW| 0|___A|__NX|___D| 0|___G)
211 #define __PAGE_KERNEL_EXEC (__PP|__RW| 0|___A| 0|___D| 0|___G)
214 * Page tables needs to have Write=1 in order for any lower PTEs to be
215 * writable. This includes shadow stack memory (Write=0, Dirty=1)
217 #define _KERNPG_TABLE_NOENC (__PP|__RW| 0|___A| 0|___D| 0| 0)
218 #define _KERNPG_TABLE (__PP|__RW| 0|___A| 0|___D| 0| 0| _ENC)
219 #define _PAGE_TABLE_NOENC (__PP|__RW|_USR|___A| 0|___D| 0| 0)
220 #define _PAGE_TABLE (__PP|__RW|_USR|___A| 0|___D| 0| 0| _ENC)
222 #define __PAGE_KERNEL_RO (__PP| 0| 0|___A|__NX| 0| 0|___G)
223 #define __PAGE_KERNEL_ROX (__PP| 0| 0|___A| 0| 0| 0|___G)
224 #define __PAGE_KERNEL (__PP|__RW| 0|___A|__NX|___D| 0|___G)
225 #define __PAGE_KERNEL_EXEC (__PP|__RW| 0|___A| 0|___D| 0|___G)
226 #define __PAGE_KERNEL_NOCACHE (__PP|__RW| 0|___A|__NX|___D| 0|___G| __NC)
227 #define __PAGE_KERNEL_VVAR (__PP| 0|_USR|___A|__NX| 0| 0|___G)
228 #define __PAGE_KERNEL_LARGE (__PP|__RW| 0|___A|__NX|___D|_PSE|___G)
229 #define __PAGE_KERNEL_LARGE_EXEC (__PP|__RW| 0|___A| 0|___D|_PSE|___G)
230 #define __PAGE_KERNEL_WP (__PP|__RW| 0|___A|__NX|___D| 0|___G| __WP)
233 #define __PAGE_KERNEL_IO __PAGE_KERNEL
234 #define __PAGE_KERNEL_IO_NOCACHE __PAGE_KERNEL_NOCACHE
239 #define __PAGE_KERNEL_ENC (__PAGE_KERNEL | _ENC)
240 #define __PAGE_KERNEL_ENC_WP (__PAGE_KERNEL_WP | _ENC)
241 #define __PAGE_KERNEL_NOENC (__PAGE_KERNEL | 0)
242 #define __PAGE_KERNEL_NOENC_WP (__PAGE_KERNEL_WP | 0)
244 #define __pgprot_mask(x) __pgprot((x) & __default_kernel_pte_mask)
246 #define PAGE_KERNEL __pgprot_mask(__PAGE_KERNEL | _ENC)
247 #define PAGE_KERNEL_NOENC __pgprot_mask(__PAGE_KERNEL | 0)
248 #define PAGE_KERNEL_RO __pgprot_mask(__PAGE_KERNEL_RO | _ENC)
249 #define PAGE_KERNEL_EXEC __pgprot_mask(__PAGE_KERNEL_EXEC | _ENC)
250 #define PAGE_KERNEL_EXEC_NOENC __pgprot_mask(__PAGE_KERNEL_EXEC | 0)
251 #define PAGE_KERNEL_ROX __pgprot_mask(__PAGE_KERNEL_ROX | _ENC)
252 #define PAGE_KERNEL_NOCACHE __pgprot_mask(__PAGE_KERNEL_NOCACHE | _ENC)
253 #define PAGE_KERNEL_LARGE __pgprot_mask(__PAGE_KERNEL_LARGE | _ENC)
254 #define PAGE_KERNEL_LARGE_EXEC __pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC)
255 #define PAGE_KERNEL_VVAR __pgprot_mask(__PAGE_KERNEL_VVAR | _ENC)
257 #define PAGE_KERNEL_IO __pgprot_mask(__PAGE_KERNEL_IO)
258 #define PAGE_KERNEL_IO_NOCACHE __pgprot_mask(__PAGE_KERNEL_IO_NOCACHE)
260 #endif /* __ASSEMBLY__ */
263 * early identity mapping pte attrib macros.
266 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
268 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
269 #define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
270 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
274 # include <asm/pgtable_32_types.h>
276 # include <asm/pgtable_64_types.h>
281 #include <linux/types.h>
283 /* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
284 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
287 * Extracts the flags from a (pte|pmd|pud|pgd)val_t
288 * This includes the protection key value.
290 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
292 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
294 typedef struct { pgdval_t pgd; } pgd_t;
296 static inline pgprot_t pgprot_nx(pgprot_t prot)
298 return __pgprot(pgprot_val(prot) | _PAGE_NX);
300 #define pgprot_nx pgprot_nx
302 #ifdef CONFIG_X86_PAE
305 * PHYSICAL_PAGE_MASK might be non-constant when SME is compiled in, so we can't
309 #define PGD_PAE_PAGE_MASK ((signed long)PAGE_MASK)
310 #define PGD_PAE_PHYS_MASK (((1ULL << __PHYSICAL_MASK_SHIFT)-1) & PGD_PAE_PAGE_MASK)
313 * PAE allows Base Address, P, PWT, PCD and AVL bits to be set in PGD entries.
314 * All other bits are Reserved MBZ
316 #define PGD_ALLOWED_BITS (PGD_PAE_PHYS_MASK | _PAGE_PRESENT | \
317 _PAGE_PWT | _PAGE_PCD | \
318 _PAGE_SOFTW1 | _PAGE_SOFTW2 | _PAGE_SOFTW3)
321 /* No need to mask any bits for !PAE */
322 #define PGD_ALLOWED_BITS (~0ULL)
325 static inline pgd_t native_make_pgd(pgdval_t val)
327 return (pgd_t) { val & PGD_ALLOWED_BITS };
330 static inline pgdval_t native_pgd_val(pgd_t pgd)
332 return pgd.pgd & PGD_ALLOWED_BITS;
335 static inline pgdval_t pgd_flags(pgd_t pgd)
337 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
340 #if CONFIG_PGTABLE_LEVELS > 4
341 typedef struct { p4dval_t p4d; } p4d_t;
343 static inline p4d_t native_make_p4d(pudval_t val)
345 return (p4d_t) { val };
348 static inline p4dval_t native_p4d_val(p4d_t p4d)
353 #include <asm-generic/pgtable-nop4d.h>
355 static inline p4d_t native_make_p4d(pudval_t val)
357 return (p4d_t) { .pgd = native_make_pgd((pgdval_t)val) };
360 static inline p4dval_t native_p4d_val(p4d_t p4d)
362 return native_pgd_val(p4d.pgd);
366 #if CONFIG_PGTABLE_LEVELS > 3
367 typedef struct { pudval_t pud; } pud_t;
369 static inline pud_t native_make_pud(pmdval_t val)
371 return (pud_t) { val };
374 static inline pudval_t native_pud_val(pud_t pud)
379 #include <asm-generic/pgtable-nopud.h>
381 static inline pud_t native_make_pud(pudval_t val)
383 return (pud_t) { .p4d.pgd = native_make_pgd(val) };
386 static inline pudval_t native_pud_val(pud_t pud)
388 return native_pgd_val(pud.p4d.pgd);
392 #if CONFIG_PGTABLE_LEVELS > 2
393 static inline pmd_t native_make_pmd(pmdval_t val)
395 return (pmd_t) { .pmd = val };
398 static inline pmdval_t native_pmd_val(pmd_t pmd)
403 #include <asm-generic/pgtable-nopmd.h>
405 static inline pmd_t native_make_pmd(pmdval_t val)
407 return (pmd_t) { .pud.p4d.pgd = native_make_pgd(val) };
410 static inline pmdval_t native_pmd_val(pmd_t pmd)
412 return native_pgd_val(pmd.pud.p4d.pgd);
416 static inline p4dval_t p4d_pfn_mask(p4d_t p4d)
418 /* No 512 GiB huge pages yet */
422 static inline p4dval_t p4d_flags_mask(p4d_t p4d)
424 return ~p4d_pfn_mask(p4d);
427 static inline p4dval_t p4d_flags(p4d_t p4d)
429 return native_p4d_val(p4d) & p4d_flags_mask(p4d);
432 static inline pudval_t pud_pfn_mask(pud_t pud)
434 if (native_pud_val(pud) & _PAGE_PSE)
435 return PHYSICAL_PUD_PAGE_MASK;
440 static inline pudval_t pud_flags_mask(pud_t pud)
442 return ~pud_pfn_mask(pud);
445 static inline pudval_t pud_flags(pud_t pud)
447 return native_pud_val(pud) & pud_flags_mask(pud);
450 static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
452 if (native_pmd_val(pmd) & _PAGE_PSE)
453 return PHYSICAL_PMD_PAGE_MASK;
458 static inline pmdval_t pmd_flags_mask(pmd_t pmd)
460 return ~pmd_pfn_mask(pmd);
463 static inline pmdval_t pmd_flags(pmd_t pmd)
465 return native_pmd_val(pmd) & pmd_flags_mask(pmd);
468 static inline pte_t native_make_pte(pteval_t val)
470 return (pte_t) { .pte = val };
473 static inline pteval_t native_pte_val(pte_t pte)
478 static inline pteval_t pte_flags(pte_t pte)
480 return native_pte_val(pte) & PTE_FLAGS_MASK;
483 #define __pte2cm_idx(cb) \
484 ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) | \
485 (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) | \
486 (((cb) >> _PAGE_BIT_PWT) & 1))
487 #define __cm_idx2pte(i) \
488 ((((i) & 4) << (_PAGE_BIT_PAT - 2)) | \
489 (((i) & 2) << (_PAGE_BIT_PCD - 1)) | \
490 (((i) & 1) << _PAGE_BIT_PWT))
492 unsigned long cachemode2protval(enum page_cache_mode pcm);
494 static inline pgprotval_t protval_4k_2_large(pgprotval_t val)
496 return (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
497 ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
499 static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
501 return __pgprot(protval_4k_2_large(pgprot_val(pgprot)));
503 static inline pgprotval_t protval_large_2_4k(pgprotval_t val)
505 return (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
506 ((val & _PAGE_PAT_LARGE) >>
507 (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
509 static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
511 return __pgprot(protval_large_2_4k(pgprot_val(pgprot)));
515 typedef struct page *pgtable_t;
517 extern pteval_t __supported_pte_mask;
518 extern pteval_t __default_kernel_pte_mask;
519 extern void set_nx(void);
520 extern int nx_enabled;
522 #define pgprot_writecombine pgprot_writecombine
523 extern pgprot_t pgprot_writecombine(pgprot_t prot);
525 #define pgprot_writethrough pgprot_writethrough
526 extern pgprot_t pgprot_writethrough(pgprot_t prot);
528 /* Indicate that x86 has its own track and untrack pfn vma functions */
529 #define __HAVE_PFNMAP_TRACKING
531 #define __HAVE_PHYS_MEM_ACCESS_PROT
533 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
534 unsigned long size, pgprot_t vma_prot);
536 /* Install a pte for a particular vaddr in kernel space. */
537 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
540 extern void native_pagetable_init(void);
542 #define native_pagetable_init paging_init
554 #ifdef CONFIG_PROC_FS
555 extern void update_page_count(int level, unsigned long pages);
557 static inline void update_page_count(int level, unsigned long pages) { }
561 * Helper function that returns the kernel pagetable entry controlling
562 * the virtual address 'address'. NULL means no pagetable entry present.
563 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
566 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
567 extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
568 unsigned int *level);
569 extern pmd_t *lookup_pmd_address(unsigned long address);
570 extern phys_addr_t slow_virt_to_phys(void *__address);
571 extern int __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn,
572 unsigned long address,
574 unsigned long page_flags);
575 extern int __init kernel_unmap_pages_in_pgd(pgd_t *pgd, unsigned long address,
576 unsigned long numpages);
577 #endif /* !__ASSEMBLY__ */
579 #endif /* _ASM_X86_PGTABLE_DEFS_H */