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 pte_ERROR(e) \
110 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
111 #ifndef __PAGETABLE_PMD_FOLDED
112 #define pmd_ERROR(e) \
113 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
114 #endif
115 #ifndef __PAGETABLE_PUD_FOLDED
116 #define pud_ERROR(e) \
117 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
118 #endif
119 #define pgd_ERROR(e) \
120 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
121
122 extern pte_t invalid_pte_table[PTRS_PER_PTE];
123
124 #ifndef __PAGETABLE_PUD_FOLDED
125
126 typedef struct { unsigned long pud; } pud_t;
127 #define pud_val(x) ((x).pud)
128 #define __pud(x) ((pud_t) { (x) })
129
130 extern pud_t invalid_pud_table[PTRS_PER_PUD];
131
132 /*
133 * Empty pgd/p4d entries point to the invalid_pud_table.
134 */
p4d_none(p4d_t p4d)135 static inline int p4d_none(p4d_t p4d)
136 {
137 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
138 }
139
p4d_bad(p4d_t p4d)140 static inline int p4d_bad(p4d_t p4d)
141 {
142 return p4d_val(p4d) & ~PAGE_MASK;
143 }
144
p4d_present(p4d_t p4d)145 static inline int p4d_present(p4d_t p4d)
146 {
147 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
148 }
149
p4d_clear(p4d_t * p4dp)150 static inline void p4d_clear(p4d_t *p4dp)
151 {
152 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
153 }
154
p4d_pgtable(p4d_t p4d)155 static inline pud_t *p4d_pgtable(p4d_t p4d)
156 {
157 return (pud_t *)p4d_val(p4d);
158 }
159
set_p4d(p4d_t * p4d,p4d_t p4dval)160 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
161 {
162 *p4d = p4dval;
163 }
164
165 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
166 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
167
168 #endif
169
170 #ifndef __PAGETABLE_PMD_FOLDED
171
172 typedef struct { unsigned long pmd; } pmd_t;
173 #define pmd_val(x) ((x).pmd)
174 #define __pmd(x) ((pmd_t) { (x) })
175
176 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
177
178 /*
179 * Empty pud entries point to the invalid_pmd_table.
180 */
pud_none(pud_t pud)181 static inline int pud_none(pud_t pud)
182 {
183 return pud_val(pud) == (unsigned long)invalid_pmd_table;
184 }
185
pud_bad(pud_t pud)186 static inline int pud_bad(pud_t pud)
187 {
188 return pud_val(pud) & ~PAGE_MASK;
189 }
190
pud_present(pud_t pud)191 static inline int pud_present(pud_t pud)
192 {
193 return pud_val(pud) != (unsigned long)invalid_pmd_table;
194 }
195
pud_clear(pud_t * pudp)196 static inline void pud_clear(pud_t *pudp)
197 {
198 pud_val(*pudp) = ((unsigned long)invalid_pmd_table);
199 }
200
pud_pgtable(pud_t pud)201 static inline pmd_t *pud_pgtable(pud_t pud)
202 {
203 return (pmd_t *)pud_val(pud);
204 }
205
206 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
207
208 #define pud_phys(pud) PHYSADDR(pud_val(pud))
209 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
210
211 #endif
212
213 /*
214 * Empty pmd entries point to the invalid_pte_table.
215 */
pmd_none(pmd_t pmd)216 static inline int pmd_none(pmd_t pmd)
217 {
218 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
219 }
220
pmd_bad(pmd_t pmd)221 static inline int pmd_bad(pmd_t pmd)
222 {
223 return (pmd_val(pmd) & ~PAGE_MASK);
224 }
225
pmd_present(pmd_t pmd)226 static inline int pmd_present(pmd_t pmd)
227 {
228 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
229 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
230
231 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
232 }
233
pmd_clear(pmd_t * pmdp)234 static inline void pmd_clear(pmd_t *pmdp)
235 {
236 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table);
237 }
238
239 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
240
241 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
242
243 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
244 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
245 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
246
247 #define pmd_page_vaddr(pmd) pmd_val(pmd)
248
249 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
250 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
251
252 #define pte_page(x) pfn_to_page(pte_pfn(x))
253 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
254 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
255 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
256
257 /*
258 * Initialize a new pgd / pud / pmd table with invalid pointers.
259 */
260 extern void pgd_init(void *addr);
261 extern void pud_init(void *addr);
262 extern void pmd_init(void *addr);
263
264 /*
265 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
266 * are !pte_none() && !pte_present().
267 *
268 * Format of swap PTEs:
269 *
270 * 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
271 * 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
272 * <--------------------------- offset ---------------------------
273 *
274 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
275 * 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
276 * --------------> E <--- type ---> <---------- zeroes ---------->
277 *
278 * E is the exclusive marker that is not stored in swap entries.
279 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
280 */
mk_swap_pte(unsigned long type,unsigned long offset)281 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
282 { pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; }
283
284 #define __swp_type(x) (((x).val >> 16) & 0x7f)
285 #define __swp_offset(x) ((x).val >> 24)
286 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
287 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
288 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
289 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
290 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
291
pte_swp_exclusive(pte_t pte)292 static inline int pte_swp_exclusive(pte_t pte)
293 {
294 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
295 }
296
pte_swp_mkexclusive(pte_t pte)297 static inline pte_t pte_swp_mkexclusive(pte_t pte)
298 {
299 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
300 return pte;
301 }
302
pte_swp_clear_exclusive(pte_t pte)303 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
304 {
305 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
306 return pte;
307 }
308
309 extern void paging_init(void);
310
311 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
312 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
313 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
314
set_pte(pte_t * ptep,pte_t pteval)315 static inline void set_pte(pte_t *ptep, pte_t pteval)
316 {
317 *ptep = pteval;
318 if (pte_val(pteval) & _PAGE_GLOBAL) {
319 pte_t *buddy = ptep_buddy(ptep);
320 /*
321 * Make sure the buddy is global too (if it's !none,
322 * it better already be global)
323 */
324 #ifdef CONFIG_SMP
325 /*
326 * For SMP, multiple CPUs can race, so we need to do
327 * this atomically.
328 */
329 unsigned long page_global = _PAGE_GLOBAL;
330 unsigned long tmp;
331
332 __asm__ __volatile__ (
333 "1:" __LL "%[tmp], %[buddy] \n"
334 " bnez %[tmp], 2f \n"
335 " or %[tmp], %[tmp], %[global] \n"
336 __SC "%[tmp], %[buddy] \n"
337 " beqz %[tmp], 1b \n"
338 " nop \n"
339 "2: \n"
340 __WEAK_LLSC_MB
341 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
342 : [global] "r" (page_global));
343 #else /* !CONFIG_SMP */
344 if (pte_none(*buddy))
345 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
346 #endif /* CONFIG_SMP */
347 }
348 }
349
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)350 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
351 {
352 /* Preserve global status for the pair */
353 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
354 set_pte(ptep, __pte(_PAGE_GLOBAL));
355 else
356 set_pte(ptep, __pte(0));
357 }
358
359 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
360 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
361 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
362
363 extern pgd_t swapper_pg_dir[];
364 extern pgd_t invalid_pg_dir[];
365
366 struct page *dmw_virt_to_page(unsigned long kaddr);
367 struct page *tlb_virt_to_page(unsigned long kaddr);
368
369 /*
370 * The following only work if pte_present() is true.
371 * Undefined behaviour if not..
372 */
pte_write(pte_t pte)373 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
pte_young(pte_t pte)374 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
pte_dirty(pte_t pte)375 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
376
pte_mkold(pte_t pte)377 static inline pte_t pte_mkold(pte_t pte)
378 {
379 pte_val(pte) &= ~_PAGE_ACCESSED;
380 return pte;
381 }
382
pte_mkyoung(pte_t pte)383 static inline pte_t pte_mkyoung(pte_t pte)
384 {
385 pte_val(pte) |= _PAGE_ACCESSED;
386 return pte;
387 }
388
pte_mkclean(pte_t pte)389 static inline pte_t pte_mkclean(pte_t pte)
390 {
391 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
392 return pte;
393 }
394
pte_mkdirty(pte_t pte)395 static inline pte_t pte_mkdirty(pte_t pte)
396 {
397 pte_val(pte) |= _PAGE_MODIFIED;
398 if (pte_val(pte) & _PAGE_WRITE)
399 pte_val(pte) |= _PAGE_DIRTY;
400 return pte;
401 }
402
pte_mkwrite_novma(pte_t pte)403 static inline pte_t pte_mkwrite_novma(pte_t pte)
404 {
405 pte_val(pte) |= _PAGE_WRITE;
406 if (pte_val(pte) & _PAGE_MODIFIED)
407 pte_val(pte) |= _PAGE_DIRTY;
408 return pte;
409 }
410
pte_wrprotect(pte_t pte)411 static inline pte_t pte_wrprotect(pte_t pte)
412 {
413 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
414 return pte;
415 }
416
pte_huge(pte_t pte)417 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
418
pte_mkhuge(pte_t pte)419 static inline pte_t pte_mkhuge(pte_t pte)
420 {
421 pte_val(pte) |= _PAGE_HUGE;
422 return pte;
423 }
424
425 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
pte_special(pte_t pte)426 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
pte_mkspecial(pte_t pte)427 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
428 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
429
430 #define pte_accessible pte_accessible
pte_accessible(struct mm_struct * mm,pte_t a)431 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
432 {
433 if (pte_val(a) & _PAGE_PRESENT)
434 return true;
435
436 if ((pte_val(a) & _PAGE_PROTNONE) &&
437 atomic_read(&mm->tlb_flush_pending))
438 return true;
439
440 return false;
441 }
442
443 /*
444 * Conversion functions: convert a page and protection to a page entry,
445 * and a page entry and page directory to the page they refer to.
446 */
447 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
448
pte_modify(pte_t pte,pgprot_t newprot)449 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
450 {
451 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
452 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
453 }
454
455 extern void __update_tlb(struct vm_area_struct *vma,
456 unsigned long address, pte_t *ptep);
457
update_mmu_cache_range(struct vm_fault * vmf,struct vm_area_struct * vma,unsigned long address,pte_t * ptep,unsigned int nr)458 static inline void update_mmu_cache_range(struct vm_fault *vmf,
459 struct vm_area_struct *vma, unsigned long address,
460 pte_t *ptep, unsigned int nr)
461 {
462 for (;;) {
463 __update_tlb(vma, address, ptep);
464 if (--nr == 0)
465 break;
466 address += PAGE_SIZE;
467 ptep++;
468 }
469 }
470 #define update_mmu_cache(vma, addr, ptep) \
471 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
472
473 #define __HAVE_ARCH_UPDATE_MMU_TLB
474 #define update_mmu_tlb update_mmu_cache
475
update_mmu_cache_pmd(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)476 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
477 unsigned long address, pmd_t *pmdp)
478 {
479 __update_tlb(vma, address, (pte_t *)pmdp);
480 }
481
pmd_pfn(pmd_t pmd)482 static inline unsigned long pmd_pfn(pmd_t pmd)
483 {
484 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
485 }
486
487 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
488
489 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
490 #define pmdp_establish generic_pmdp_establish
491
pmd_trans_huge(pmd_t pmd)492 static inline int pmd_trans_huge(pmd_t pmd)
493 {
494 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
495 }
496
pmd_mkhuge(pmd_t pmd)497 static inline pmd_t pmd_mkhuge(pmd_t pmd)
498 {
499 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
500 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
501 pmd_val(pmd) |= _PAGE_HUGE;
502
503 return pmd;
504 }
505
506 #define pmd_write pmd_write
pmd_write(pmd_t pmd)507 static inline int pmd_write(pmd_t pmd)
508 {
509 return !!(pmd_val(pmd) & _PAGE_WRITE);
510 }
511
pmd_mkwrite_novma(pmd_t pmd)512 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
513 {
514 pmd_val(pmd) |= _PAGE_WRITE;
515 if (pmd_val(pmd) & _PAGE_MODIFIED)
516 pmd_val(pmd) |= _PAGE_DIRTY;
517 return pmd;
518 }
519
pmd_wrprotect(pmd_t pmd)520 static inline pmd_t pmd_wrprotect(pmd_t pmd)
521 {
522 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
523 return pmd;
524 }
525
pmd_dirty(pmd_t pmd)526 static inline int pmd_dirty(pmd_t pmd)
527 {
528 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
529 }
530
pmd_mkclean(pmd_t pmd)531 static inline pmd_t pmd_mkclean(pmd_t pmd)
532 {
533 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
534 return pmd;
535 }
536
pmd_mkdirty(pmd_t pmd)537 static inline pmd_t pmd_mkdirty(pmd_t pmd)
538 {
539 pmd_val(pmd) |= _PAGE_MODIFIED;
540 if (pmd_val(pmd) & _PAGE_WRITE)
541 pmd_val(pmd) |= _PAGE_DIRTY;
542 return pmd;
543 }
544
545 #define pmd_young pmd_young
pmd_young(pmd_t pmd)546 static inline int pmd_young(pmd_t pmd)
547 {
548 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
549 }
550
pmd_mkold(pmd_t pmd)551 static inline pmd_t pmd_mkold(pmd_t pmd)
552 {
553 pmd_val(pmd) &= ~_PAGE_ACCESSED;
554 return pmd;
555 }
556
pmd_mkyoung(pmd_t pmd)557 static inline pmd_t pmd_mkyoung(pmd_t pmd)
558 {
559 pmd_val(pmd) |= _PAGE_ACCESSED;
560 return pmd;
561 }
562
pmd_page(pmd_t pmd)563 static inline struct page *pmd_page(pmd_t pmd)
564 {
565 if (pmd_trans_huge(pmd))
566 return pfn_to_page(pmd_pfn(pmd));
567
568 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
569 }
570
pmd_modify(pmd_t pmd,pgprot_t newprot)571 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
572 {
573 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
574 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
575 return pmd;
576 }
577
pmd_mkinvalid(pmd_t pmd)578 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
579 {
580 pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
581 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
582
583 return pmd;
584 }
585
586 /*
587 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
588 * different prototype.
589 */
590 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
pmdp_huge_get_and_clear(struct mm_struct * mm,unsigned long address,pmd_t * pmdp)591 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
592 unsigned long address, pmd_t *pmdp)
593 {
594 pmd_t old = *pmdp;
595
596 pmd_clear(pmdp);
597
598 return old;
599 }
600
601 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
602
603 #ifdef CONFIG_NUMA_BALANCING
pte_protnone(pte_t pte)604 static inline long pte_protnone(pte_t pte)
605 {
606 return (pte_val(pte) & _PAGE_PROTNONE);
607 }
608
pmd_protnone(pmd_t pmd)609 static inline long pmd_protnone(pmd_t pmd)
610 {
611 return (pmd_val(pmd) & _PAGE_PROTNONE);
612 }
613 #endif /* CONFIG_NUMA_BALANCING */
614
615 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
616 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
617
618 /*
619 * We provide our own get_unmapped area to cope with the virtual aliasing
620 * constraints placed on us by the cache architecture.
621 */
622 #define HAVE_ARCH_UNMAPPED_AREA
623 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
624
625 #endif /* !__ASSEMBLY__ */
626
627 #endif /* _ASM_PGTABLE_H */
628