1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 *
5 * Derived from MIPS:
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9 #ifndef _ASM_PGTABLE_H
10 #define _ASM_PGTABLE_H
11
12 #include <linux/compiler.h>
13 #include <asm/addrspace.h>
14 #include <asm/page.h>
15 #include <asm/pgtable-bits.h>
16
17 #if CONFIG_PGTABLE_LEVELS == 2
18 #include <asm-generic/pgtable-nopmd.h>
19 #elif CONFIG_PGTABLE_LEVELS == 3
20 #include <asm-generic/pgtable-nopud.h>
21 #else
22 #include <asm-generic/pgtable-nop4d.h>
23 #endif
24
25 #if CONFIG_PGTABLE_LEVELS == 2
26 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
27 #elif CONFIG_PGTABLE_LEVELS == 3
28 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
29 #define PMD_SIZE (1UL << PMD_SHIFT)
30 #define PMD_MASK (~(PMD_SIZE-1))
31 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3))
32 #elif CONFIG_PGTABLE_LEVELS == 4
33 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
34 #define PMD_SIZE (1UL << PMD_SHIFT)
35 #define PMD_MASK (~(PMD_SIZE-1))
36 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3))
37 #define PUD_SIZE (1UL << PUD_SHIFT)
38 #define PUD_MASK (~(PUD_SIZE-1))
39 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - 3))
40 #endif
41
42 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
43 #define PGDIR_MASK (~(PGDIR_SIZE-1))
44
45 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3))
46
47 #define PTRS_PER_PGD (PAGE_SIZE >> 3)
48 #if CONFIG_PGTABLE_LEVELS > 3
49 #define PTRS_PER_PUD (PAGE_SIZE >> 3)
50 #endif
51 #if CONFIG_PGTABLE_LEVELS > 2
52 #define PTRS_PER_PMD (PAGE_SIZE >> 3)
53 #endif
54 #define PTRS_PER_PTE (PAGE_SIZE >> 3)
55
56 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
57
58 #ifndef __ASSEMBLY__
59
60 #include <linux/mm_types.h>
61 #include <linux/mmzone.h>
62 #include <asm/fixmap.h>
63 #include <asm/sparsemem.h>
64
65 struct mm_struct;
66 struct vm_area_struct;
67
68 /*
69 * ZERO_PAGE is a global shared page that is always zero; used
70 * for zero-mapped memory areas etc..
71 */
72
73 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
74
75 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
76
77 /*
78 * TLB refill handlers may also map the vmalloc area into xkvrange.
79 * Avoid the first couple of pages so NULL pointer dereferences will
80 * still reliably trap.
81 */
82 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
83 #define MODULES_END (MODULES_VADDR + SZ_256M)
84
85 #ifdef CONFIG_KFENCE
86 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
87 #else
88 #define KFENCE_AREA_SIZE 0
89 #endif
90
91 #define VMALLOC_START MODULES_END
92
93 #ifndef CONFIG_KASAN
94 #define VMALLOC_END \
95 (vm_map_base + \
96 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
97 #else
98 #define VMALLOC_END \
99 (vm_map_base + \
100 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
101 #endif
102
103 #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
104 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
105
106 #define KFENCE_AREA_START (VMEMMAP_END + 1)
107 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1)
108
109 #define ptep_get(ptep) READ_ONCE(*(ptep))
110 #define pmdp_get(pmdp) READ_ONCE(*(pmdp))
111
112 #define pte_ERROR(e) \
113 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
114 #ifndef __PAGETABLE_PMD_FOLDED
115 #define pmd_ERROR(e) \
116 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
117 #endif
118 #ifndef __PAGETABLE_PUD_FOLDED
119 #define pud_ERROR(e) \
120 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
121 #endif
122 #define pgd_ERROR(e) \
123 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
124
125 extern pte_t invalid_pte_table[PTRS_PER_PTE];
126
127 #ifndef __PAGETABLE_PUD_FOLDED
128
129 typedef struct { unsigned long pud; } pud_t;
130 #define pud_val(x) ((x).pud)
131 #define __pud(x) ((pud_t) { (x) })
132
133 extern pud_t invalid_pud_table[PTRS_PER_PUD];
134
135 /*
136 * Empty pgd/p4d entries point to the invalid_pud_table.
137 */
138 static inline int p4d_none(p4d_t p4d)
139 {
140 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
141 }
142
143 static inline int p4d_bad(p4d_t p4d)
144 {
145 return p4d_val(p4d) & ~PAGE_MASK;
146 }
147
148 static inline int p4d_present(p4d_t p4d)
149 {
150 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
151 }
152
153 static inline pud_t *p4d_pgtable(p4d_t p4d)
154 {
155 return (pud_t *)p4d_val(p4d);
156 }
157
158 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
159 {
160 WRITE_ONCE(*p4d, p4dval);
161 }
162
163 static inline void p4d_clear(p4d_t *p4dp)
164 {
165 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table));
166 }
167
168 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
169 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
170
171 #endif
172
173 #ifndef __PAGETABLE_PMD_FOLDED
174
175 typedef struct { unsigned long pmd; } pmd_t;
176 #define pmd_val(x) ((x).pmd)
177 #define __pmd(x) ((pmd_t) { (x) })
178
179 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
180
181 /*
182 * Empty pud entries point to the invalid_pmd_table.
183 */
184 static inline int pud_none(pud_t pud)
185 {
186 return pud_val(pud) == (unsigned long)invalid_pmd_table;
187 }
188
189 static inline int pud_bad(pud_t pud)
190 {
191 return pud_val(pud) & ~PAGE_MASK;
192 }
193
194 static inline int pud_present(pud_t pud)
195 {
196 return pud_val(pud) != (unsigned long)invalid_pmd_table;
197 }
198
199 static inline pmd_t *pud_pgtable(pud_t pud)
200 {
201 return (pmd_t *)pud_val(pud);
202 }
203
204 static inline void set_pud(pud_t *pud, pud_t pudval)
205 {
206 WRITE_ONCE(*pud, pudval);
207 }
208
209 static inline void pud_clear(pud_t *pudp)
210 {
211 set_pud(pudp, __pud((unsigned long)invalid_pmd_table));
212 }
213
214 #define pud_phys(pud) PHYSADDR(pud_val(pud))
215 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
216
217 #endif
218
219 /*
220 * Empty pmd entries point to the invalid_pte_table.
221 */
222 static inline int pmd_none(pmd_t pmd)
223 {
224 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
225 }
226
227 static inline int pmd_bad(pmd_t pmd)
228 {
229 return (pmd_val(pmd) & ~PAGE_MASK);
230 }
231
232 static inline int pmd_present(pmd_t pmd)
233 {
234 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
235 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
236
237 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
238 }
239
240 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval)
241 {
242 WRITE_ONCE(*pmd, pmdval);
243 }
244
245 static inline void pmd_clear(pmd_t *pmdp)
246 {
247 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table));
248 }
249
250 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
251
252 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
253 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
254 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
255
256 #define pmd_page_vaddr(pmd) pmd_val(pmd)
257
258 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
259 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
260
261 #define pte_page(x) pfn_to_page(pte_pfn(x))
262 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
263 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
264 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
265
266 /*
267 * Initialize a new pgd / pud / pmd table with invalid pointers.
268 */
269 extern void pgd_init(void *addr);
270 extern void pud_init(void *addr);
271 extern void pmd_init(void *addr);
272
273 /*
274 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
275 * are !pte_none() && !pte_present().
276 *
277 * Format of swap PTEs:
278 *
279 * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3
280 * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
281 * <--------------------------- offset ---------------------------
282 *
283 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
284 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
285 * --------------> E <--- type ---> <---------- zeroes ---------->
286 *
287 * E is the exclusive marker that is not stored in swap entries.
288 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
289 */
290 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
291 { pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; }
292
293 #define __swp_type(x) (((x).val >> 16) & 0x7f)
294 #define __swp_offset(x) ((x).val >> 24)
295 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
296 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
297 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
298 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
299 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
300
301 static inline int pte_swp_exclusive(pte_t pte)
302 {
303 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
304 }
305
306 static inline pte_t pte_swp_mkexclusive(pte_t pte)
307 {
308 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
309 return pte;
310 }
311
312 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
313 {
314 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
315 return pte;
316 }
317
318 extern void paging_init(void);
319
320 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
321 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
322 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
323
324 static inline void set_pte(pte_t *ptep, pte_t pteval)
325 {
326 WRITE_ONCE(*ptep, pteval);
327
328 if (pte_val(pteval) & _PAGE_GLOBAL) {
329 pte_t *buddy = ptep_buddy(ptep);
330 /*
331 * Make sure the buddy is global too (if it's !none,
332 * it better already be global)
333 */
334 #ifdef CONFIG_SMP
335 /*
336 * For SMP, multiple CPUs can race, so we need to do
337 * this atomically.
338 */
339 unsigned long page_global = _PAGE_GLOBAL;
340 unsigned long tmp;
341
342 __asm__ __volatile__ (
343 "1:" __LL "%[tmp], %[buddy] \n"
344 " bnez %[tmp], 2f \n"
345 " or %[tmp], %[tmp], %[global] \n"
346 __SC "%[tmp], %[buddy] \n"
347 " beqz %[tmp], 1b \n"
348 " nop \n"
349 "2: \n"
350 __WEAK_LLSC_MB
351 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
352 : [global] "r" (page_global));
353 #else /* !CONFIG_SMP */
354 if (pte_none(ptep_get(buddy)))
355 WRITE_ONCE(*buddy, __pte(pte_val(ptep_get(buddy)) | _PAGE_GLOBAL));
356 #endif /* CONFIG_SMP */
357 }
358 }
359
360 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
361 {
362 /* Preserve global status for the pair */
363 if (pte_val(ptep_get(ptep_buddy(ptep))) & _PAGE_GLOBAL)
364 set_pte(ptep, __pte(_PAGE_GLOBAL));
365 else
366 set_pte(ptep, __pte(0));
367 }
368
369 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
370 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
371 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
372
373 extern pgd_t swapper_pg_dir[];
374 extern pgd_t invalid_pg_dir[];
375
376 /*
377 * The following only work if pte_present() is true.
378 * Undefined behaviour if not..
379 */
380 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
381 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
382 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
383
384 static inline pte_t pte_mkold(pte_t pte)
385 {
386 pte_val(pte) &= ~_PAGE_ACCESSED;
387 return pte;
388 }
389
390 static inline pte_t pte_mkyoung(pte_t pte)
391 {
392 pte_val(pte) |= _PAGE_ACCESSED;
393 return pte;
394 }
395
396 static inline pte_t pte_mkclean(pte_t pte)
397 {
398 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
399 return pte;
400 }
401
402 static inline pte_t pte_mkdirty(pte_t pte)
403 {
404 pte_val(pte) |= _PAGE_MODIFIED;
405 if (pte_val(pte) & _PAGE_WRITE)
406 pte_val(pte) |= _PAGE_DIRTY;
407 return pte;
408 }
409
410 static inline pte_t pte_mkwrite_novma(pte_t pte)
411 {
412 pte_val(pte) |= _PAGE_WRITE;
413 if (pte_val(pte) & _PAGE_MODIFIED)
414 pte_val(pte) |= _PAGE_DIRTY;
415 return pte;
416 }
417
418 static inline pte_t pte_wrprotect(pte_t pte)
419 {
420 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
421 return pte;
422 }
423
424 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
425
426 static inline pte_t pte_mkhuge(pte_t pte)
427 {
428 pte_val(pte) |= _PAGE_HUGE;
429 return pte;
430 }
431
432 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
433 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
434 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
435 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
436
437 static inline int pte_devmap(pte_t pte) { return !!(pte_val(pte) & _PAGE_DEVMAP); }
438 static inline pte_t pte_mkdevmap(pte_t pte) { pte_val(pte) |= _PAGE_DEVMAP; return pte; }
439
440 #define pte_accessible pte_accessible
441 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
442 {
443 if (pte_val(a) & _PAGE_PRESENT)
444 return true;
445
446 if ((pte_val(a) & _PAGE_PROTNONE) &&
447 atomic_read(&mm->tlb_flush_pending))
448 return true;
449
450 return false;
451 }
452
453 /*
454 * Conversion functions: convert a page and protection to a page entry,
455 * and a page entry and page directory to the page they refer to.
456 */
457 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
458
459 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
460 {
461 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
462 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
463 }
464
465 extern void __update_tlb(struct vm_area_struct *vma,
466 unsigned long address, pte_t *ptep);
467
468 static inline void update_mmu_cache_range(struct vm_fault *vmf,
469 struct vm_area_struct *vma, unsigned long address,
470 pte_t *ptep, unsigned int nr)
471 {
472 for (;;) {
473 __update_tlb(vma, address, ptep);
474 if (--nr == 0)
475 break;
476 address += PAGE_SIZE;
477 ptep++;
478 }
479 }
480 #define update_mmu_cache(vma, addr, ptep) \
481 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
482
483 #define update_mmu_tlb_range(vma, addr, ptep, nr) \
484 update_mmu_cache_range(NULL, vma, addr, ptep, nr)
485
486 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
487 unsigned long address, pmd_t *pmdp)
488 {
489 __update_tlb(vma, address, (pte_t *)pmdp);
490 }
491
492 static inline unsigned long pmd_pfn(pmd_t pmd)
493 {
494 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
495 }
496
497 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
498
499 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
500 #define pmdp_establish generic_pmdp_establish
501
502 static inline int pmd_trans_huge(pmd_t pmd)
503 {
504 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
505 }
506
507 static inline pmd_t pmd_mkhuge(pmd_t pmd)
508 {
509 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
510 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
511 pmd_val(pmd) |= _PAGE_HUGE;
512
513 return pmd;
514 }
515
516 #define pmd_write pmd_write
517 static inline int pmd_write(pmd_t pmd)
518 {
519 return !!(pmd_val(pmd) & _PAGE_WRITE);
520 }
521
522 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
523 {
524 pmd_val(pmd) |= _PAGE_WRITE;
525 if (pmd_val(pmd) & _PAGE_MODIFIED)
526 pmd_val(pmd) |= _PAGE_DIRTY;
527 return pmd;
528 }
529
530 static inline pmd_t pmd_wrprotect(pmd_t pmd)
531 {
532 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
533 return pmd;
534 }
535
536 #define pmd_dirty pmd_dirty
537 static inline int pmd_dirty(pmd_t pmd)
538 {
539 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
540 }
541
542 static inline pmd_t pmd_mkclean(pmd_t pmd)
543 {
544 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
545 return pmd;
546 }
547
548 static inline pmd_t pmd_mkdirty(pmd_t pmd)
549 {
550 pmd_val(pmd) |= _PAGE_MODIFIED;
551 if (pmd_val(pmd) & _PAGE_WRITE)
552 pmd_val(pmd) |= _PAGE_DIRTY;
553 return pmd;
554 }
555
556 #define pmd_young pmd_young
557 static inline int pmd_young(pmd_t pmd)
558 {
559 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
560 }
561
562 static inline pmd_t pmd_mkold(pmd_t pmd)
563 {
564 pmd_val(pmd) &= ~_PAGE_ACCESSED;
565 return pmd;
566 }
567
568 static inline pmd_t pmd_mkyoung(pmd_t pmd)
569 {
570 pmd_val(pmd) |= _PAGE_ACCESSED;
571 return pmd;
572 }
573
574 static inline int pmd_devmap(pmd_t pmd)
575 {
576 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
577 }
578
579 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
580 {
581 pmd_val(pmd) |= _PAGE_DEVMAP;
582 return pmd;
583 }
584
585 static inline struct page *pmd_page(pmd_t pmd)
586 {
587 if (pmd_trans_huge(pmd))
588 return pfn_to_page(pmd_pfn(pmd));
589
590 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
591 }
592
593 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
594 {
595 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
596 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
597 return pmd;
598 }
599
600 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
601 {
602 pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
603 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
604
605 return pmd;
606 }
607
608 /*
609 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
610 * different prototype.
611 */
612 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
613 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
614 unsigned long address, pmd_t *pmdp)
615 {
616 pmd_t old = pmdp_get(pmdp);
617
618 pmd_clear(pmdp);
619
620 return old;
621 }
622
623 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
624
625 #ifdef CONFIG_NUMA_BALANCING
626 static inline long pte_protnone(pte_t pte)
627 {
628 return (pte_val(pte) & _PAGE_PROTNONE);
629 }
630
631 static inline long pmd_protnone(pmd_t pmd)
632 {
633 return (pmd_val(pmd) & _PAGE_PROTNONE);
634 }
635 #endif /* CONFIG_NUMA_BALANCING */
636
637 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
638 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
639
640 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
641 #define pud_devmap(pud) (0)
642 #define pgd_devmap(pgd) (0)
643 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
644
645 /*
646 * We provide our own get_unmapped area to cope with the virtual aliasing
647 * constraints placed on us by the cache architecture.
648 */
649 #define HAVE_ARCH_UNMAPPED_AREA
650 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
651
652 #endif /* !__ASSEMBLY__ */
653
654 #endif /* _ASM_PGTABLE_H */
655
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