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/asm.h>
15 #include <asm/page.h>
16 #include <asm/pgtable-bits.h>
17
18 #if CONFIG_PGTABLE_LEVELS == 2
19 #include <asm-generic/pgtable-nopmd.h>
20 #elif CONFIG_PGTABLE_LEVELS == 3
21 #include <asm-generic/pgtable-nopud.h>
22 #else
23 #include <asm-generic/pgtable-nop4d.h>
24 #endif
25
26 #if CONFIG_PGTABLE_LEVELS == 2
27 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
28 #elif CONFIG_PGTABLE_LEVELS == 3
29 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
30 #define PMD_SIZE (1UL << PMD_SHIFT)
31 #define PMD_MASK (~(PMD_SIZE-1))
32 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG))
33 #elif CONFIG_PGTABLE_LEVELS == 4
34 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
35 #define PMD_SIZE (1UL << PMD_SHIFT)
36 #define PMD_MASK (~(PMD_SIZE-1))
37 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG))
38 #define PUD_SIZE (1UL << PUD_SHIFT)
39 #define PUD_MASK (~(PUD_SIZE-1))
40 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - PTRLOG))
41 #endif
42
43 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
44 #define PGDIR_MASK (~(PGDIR_SIZE-1))
45
46 #ifdef CONFIG_32BIT
47 #define VA_BITS 32
48 #else
49 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - PTRLOG))
50 #endif
51
52 #define PTRS_PER_PGD (PAGE_SIZE >> PTRLOG)
53 #if CONFIG_PGTABLE_LEVELS > 3
54 #define PTRS_PER_PUD (PAGE_SIZE >> PTRLOG)
55 #endif
56 #if CONFIG_PGTABLE_LEVELS > 2
57 #define PTRS_PER_PMD (PAGE_SIZE >> PTRLOG)
58 #endif
59 #define PTRS_PER_PTE (PAGE_SIZE >> PTRLOG)
60
61 #ifdef CONFIG_32BIT
62 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
63 #else
64 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
65 #endif
66
67 #ifndef __ASSEMBLER__
68
69 #include <linux/mm_types.h>
70 #include <linux/mmzone.h>
71 #include <asm/fixmap.h>
72 #include <asm/sparsemem.h>
73
74 struct mm_struct;
75 struct vm_area_struct;
76
77 /*
78 * ZERO_PAGE is a global shared page that is always zero; used
79 * for zero-mapped memory areas etc..
80 */
81
82 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
83
84 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
85
86 #ifdef CONFIG_32BIT
87
88 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
89 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE))
90
91 #endif
92
93 #ifdef CONFIG_64BIT
94
95 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
96 #define MODULES_END (MODULES_VADDR + SZ_256M)
97
98 #ifdef CONFIG_KFENCE
99 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
100 #else
101 #define KFENCE_AREA_SIZE 0
102 #endif
103
104 #define VMALLOC_START MODULES_END
105
106 #ifndef CONFIG_KASAN
107 #define VMALLOC_END \
108 (vm_map_base + \
109 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)
110 #else
111 #define VMALLOC_END \
112 (vm_map_base + \
113 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)
114 #endif
115
116 #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
117 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
118
119 #define KFENCE_AREA_START (VMEMMAP_END + 1)
120 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1)
121
122 #endif
123
124 #define ptep_get(ptep) READ_ONCE(*(ptep))
125 #define pmdp_get(pmdp) READ_ONCE(*(pmdp))
126
127 #define pte_ERROR(e) \
128 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
129 #ifndef __PAGETABLE_PMD_FOLDED
130 #define pmd_ERROR(e) \
131 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
132 #endif
133 #ifndef __PAGETABLE_PUD_FOLDED
134 #define pud_ERROR(e) \
135 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
136 #endif
137 #define pgd_ERROR(e) \
138 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
139
140 extern pte_t invalid_pte_table[PTRS_PER_PTE];
141
142 #ifndef __PAGETABLE_PUD_FOLDED
143
144 typedef struct { unsigned long pud; } pud_t;
145 #define pud_val(x) ((x).pud)
146 #define __pud(x) ((pud_t) { (x) })
147
148 extern pud_t invalid_pud_table[PTRS_PER_PUD];
149
150 /*
151 * Empty pgd/p4d entries point to the invalid_pud_table.
152 */
p4d_none(p4d_t p4d)153 static inline int p4d_none(p4d_t p4d)
154 {
155 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
156 }
157
p4d_bad(p4d_t p4d)158 static inline int p4d_bad(p4d_t p4d)
159 {
160 return p4d_val(p4d) & ~PAGE_MASK;
161 }
162
p4d_present(p4d_t p4d)163 static inline int p4d_present(p4d_t p4d)
164 {
165 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
166 }
167
p4d_pgtable(p4d_t p4d)168 static inline pud_t *p4d_pgtable(p4d_t p4d)
169 {
170 return (pud_t *)p4d_val(p4d);
171 }
172
set_p4d(p4d_t * p4d,p4d_t p4dval)173 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
174 {
175 WRITE_ONCE(*p4d, p4dval);
176 }
177
p4d_clear(p4d_t * p4dp)178 static inline void p4d_clear(p4d_t *p4dp)
179 {
180 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table));
181 }
182
183 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
184 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
185
186 #endif
187
188 #ifndef __PAGETABLE_PMD_FOLDED
189
190 typedef struct { unsigned long pmd; } pmd_t;
191 #define pmd_val(x) ((x).pmd)
192 #define __pmd(x) ((pmd_t) { (x) })
193
194 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
195
196 /*
197 * Empty pud entries point to the invalid_pmd_table.
198 */
pud_none(pud_t pud)199 static inline int pud_none(pud_t pud)
200 {
201 return pud_val(pud) == (unsigned long)invalid_pmd_table;
202 }
203
pud_bad(pud_t pud)204 static inline int pud_bad(pud_t pud)
205 {
206 return pud_val(pud) & ~PAGE_MASK;
207 }
208
pud_present(pud_t pud)209 static inline int pud_present(pud_t pud)
210 {
211 return pud_val(pud) != (unsigned long)invalid_pmd_table;
212 }
213
pud_pgtable(pud_t pud)214 static inline pmd_t *pud_pgtable(pud_t pud)
215 {
216 return (pmd_t *)pud_val(pud);
217 }
218
set_pud(pud_t * pud,pud_t pudval)219 static inline void set_pud(pud_t *pud, pud_t pudval)
220 {
221 WRITE_ONCE(*pud, pudval);
222 }
223
pud_clear(pud_t * pudp)224 static inline void pud_clear(pud_t *pudp)
225 {
226 set_pud(pudp, __pud((unsigned long)invalid_pmd_table));
227 }
228
229 #define pud_phys(pud) PHYSADDR(pud_val(pud))
230 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
231
232 #endif
233
234 /*
235 * Empty pmd entries point to the invalid_pte_table.
236 */
pmd_none(pmd_t pmd)237 static inline int pmd_none(pmd_t pmd)
238 {
239 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
240 }
241
pmd_bad(pmd_t pmd)242 static inline int pmd_bad(pmd_t pmd)
243 {
244 return (pmd_val(pmd) & ~PAGE_MASK);
245 }
246
pmd_present(pmd_t pmd)247 static inline int pmd_present(pmd_t pmd)
248 {
249 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
250 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
251
252 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
253 }
254
set_pmd(pmd_t * pmd,pmd_t pmdval)255 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval)
256 {
257 WRITE_ONCE(*pmd, pmdval);
258 }
259
pmd_clear(pmd_t * pmdp)260 static inline void pmd_clear(pmd_t *pmdp)
261 {
262 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table));
263 }
264
265 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
266
267 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
268 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
269 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
270
271 #define pmd_page_vaddr(pmd) pmd_val(pmd)
272
273 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
274
275 #define pte_page(x) pfn_to_page(pte_pfn(x))
276 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
277 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
278 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
279
280 /*
281 * Initialize a new pgd / pud / pmd table with invalid pointers.
282 */
283 extern void pgd_init(void *addr);
284 extern void pud_init(void *addr);
285 #define pud_init pud_init
286 extern void pmd_init(void *addr);
287 #define pmd_init pmd_init
288 extern void kernel_pte_init(void *addr);
289 #define kernel_pte_init kernel_pte_init
290
291 /*
292 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
293 * are !pte_none() && !pte_present().
294 *
295 * Format of 32bit swap PTEs:
296 *
297 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
298 * 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
299 * <------------ offset -------------> E <- type -> <-- zeroes -->
300 *
301 * E is the exclusive marker that is not stored in swap entries.
302 * The zero'ed bits include _PAGE_PRESENT.
303 *
304 * Format of 64bit swap PTEs:
305 *
306 * 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
307 * 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
308 * <--------------------------- offset ---------------------------
309 *
310 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
311 * 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
312 * --------------> E <--- type ---> <---------- zeroes ---------->
313 *
314 * E is the exclusive marker that is not stored in swap entries.
315 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
316 */
317
318 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7)
319 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1)
320 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16)
321 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1)
322
mk_swap_pte(unsigned long type,unsigned long offset)323 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
324 {
325 pte_t pte;
326 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT);
327 return pte;
328 }
329
330 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
331 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
332 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
333
334 #define __swp_entry_to_pte(x) __pte((x).val)
335 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE)
336 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
337 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
338
pte_swp_exclusive(pte_t pte)339 static inline bool pte_swp_exclusive(pte_t pte)
340 {
341 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
342 }
343
pte_swp_mkexclusive(pte_t pte)344 static inline pte_t pte_swp_mkexclusive(pte_t pte)
345 {
346 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
347 return pte;
348 }
349
pte_swp_clear_exclusive(pte_t pte)350 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
351 {
352 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
353 return pte;
354 }
355
356 extern void paging_init(void);
357
358 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
359 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
360 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
361
set_pte(pte_t * ptep,pte_t pteval)362 static inline void set_pte(pte_t *ptep, pte_t pteval)
363 {
364 WRITE_ONCE(*ptep, pteval);
365
366 #ifdef CONFIG_SMP
367 if (pte_val(pteval) & _PAGE_GLOBAL)
368 DBAR(0b11000); /* o_wrw = 0b11000 */
369 #endif
370 }
371
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)372 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
373 {
374 pte_t pte = ptep_get(ptep);
375 pte_val(pte) &= _PAGE_GLOBAL;
376 set_pte(ptep, pte);
377 }
378
379 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
380 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
381 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
382
383 extern pgd_t swapper_pg_dir[];
384 extern pgd_t invalid_pg_dir[];
385
386 /*
387 * The following only work if pte_present() is true.
388 * Undefined behaviour if not..
389 */
pte_write(pte_t pte)390 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
pte_young(pte_t pte)391 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
pte_dirty(pte_t pte)392 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
393
pte_mkold(pte_t pte)394 static inline pte_t pte_mkold(pte_t pte)
395 {
396 pte_val(pte) &= ~_PAGE_ACCESSED;
397 return pte;
398 }
399
pte_mkyoung(pte_t pte)400 static inline pte_t pte_mkyoung(pte_t pte)
401 {
402 pte_val(pte) |= _PAGE_ACCESSED;
403 return pte;
404 }
405
pte_mkclean(pte_t pte)406 static inline pte_t pte_mkclean(pte_t pte)
407 {
408 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
409 return pte;
410 }
411
pte_mkdirty(pte_t pte)412 static inline pte_t pte_mkdirty(pte_t pte)
413 {
414 pte_val(pte) |= _PAGE_MODIFIED;
415 if (pte_val(pte) & _PAGE_WRITE)
416 pte_val(pte) |= _PAGE_DIRTY;
417 return pte;
418 }
419
pte_mkwrite_novma(pte_t pte)420 static inline pte_t pte_mkwrite_novma(pte_t pte)
421 {
422 pte_val(pte) |= _PAGE_WRITE;
423 if (pte_val(pte) & _PAGE_MODIFIED)
424 pte_val(pte) |= _PAGE_DIRTY;
425 return pte;
426 }
427
pte_wrprotect(pte_t pte)428 static inline pte_t pte_wrprotect(pte_t pte)
429 {
430 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
431 return pte;
432 }
433
pte_huge(pte_t pte)434 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
435
pte_mkhuge(pte_t pte)436 static inline pte_t pte_mkhuge(pte_t pte)
437 {
438 pte_val(pte) |= _PAGE_HUGE;
439 return pte;
440 }
441
442 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
pte_special(pte_t pte)443 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
pte_mkspecial(pte_t pte)444 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
445 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
446
447 #define pte_accessible pte_accessible
pte_accessible(struct mm_struct * mm,pte_t a)448 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
449 {
450 if (pte_val(a) & _PAGE_PRESENT)
451 return true;
452
453 if ((pte_val(a) & _PAGE_PROTNONE) &&
454 atomic_read(&mm->tlb_flush_pending))
455 return true;
456
457 return false;
458 }
459
pte_modify(pte_t pte,pgprot_t newprot)460 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
461 {
462 if (pte_val(pte) & _PAGE_DIRTY)
463 pte_val(pte) |= _PAGE_MODIFIED;
464
465 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
466 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
467 }
468
469 extern void __update_tlb(struct vm_area_struct *vma,
470 unsigned long address, pte_t *ptep);
471
update_mmu_cache_range(struct vm_fault * vmf,struct vm_area_struct * vma,unsigned long address,pte_t * ptep,unsigned int nr)472 static inline void update_mmu_cache_range(struct vm_fault *vmf,
473 struct vm_area_struct *vma, unsigned long address,
474 pte_t *ptep, unsigned int nr)
475 {
476 for (;;) {
477 __update_tlb(vma, address, ptep);
478 if (--nr == 0)
479 break;
480 address += PAGE_SIZE;
481 ptep++;
482 }
483 }
484 #define update_mmu_cache(vma, addr, ptep) \
485 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
486
487 #define update_mmu_tlb_range(vma, addr, ptep, nr) \
488 update_mmu_cache_range(NULL, vma, addr, ptep, nr)
489
update_mmu_cache_pmd(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)490 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
491 unsigned long address, pmd_t *pmdp)
492 {
493 __update_tlb(vma, address, (pte_t *)pmdp);
494 }
495
pmd_pfn(pmd_t pmd)496 static inline unsigned long pmd_pfn(pmd_t pmd)
497 {
498 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
499 }
500
501 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
502
503 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
504 #define pmdp_establish generic_pmdp_establish
505
pmd_trans_huge(pmd_t pmd)506 static inline int pmd_trans_huge(pmd_t pmd)
507 {
508 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
509 }
510
pmd_mkhuge(pmd_t pmd)511 static inline pmd_t pmd_mkhuge(pmd_t pmd)
512 {
513 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
514 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
515 pmd_val(pmd) |= _PAGE_HUGE;
516
517 return pmd;
518 }
519
520 #define pmd_write pmd_write
pmd_write(pmd_t pmd)521 static inline int pmd_write(pmd_t pmd)
522 {
523 return !!(pmd_val(pmd) & _PAGE_WRITE);
524 }
525
pmd_mkwrite_novma(pmd_t pmd)526 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
527 {
528 pmd_val(pmd) |= _PAGE_WRITE;
529 if (pmd_val(pmd) & _PAGE_MODIFIED)
530 pmd_val(pmd) |= _PAGE_DIRTY;
531 return pmd;
532 }
533
pmd_wrprotect(pmd_t pmd)534 static inline pmd_t pmd_wrprotect(pmd_t pmd)
535 {
536 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
537 return pmd;
538 }
539
540 #define pmd_dirty pmd_dirty
pmd_dirty(pmd_t pmd)541 static inline int pmd_dirty(pmd_t pmd)
542 {
543 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
544 }
545
pmd_mkclean(pmd_t pmd)546 static inline pmd_t pmd_mkclean(pmd_t pmd)
547 {
548 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
549 return pmd;
550 }
551
pmd_mkdirty(pmd_t pmd)552 static inline pmd_t pmd_mkdirty(pmd_t pmd)
553 {
554 pmd_val(pmd) |= _PAGE_MODIFIED;
555 if (pmd_val(pmd) & _PAGE_WRITE)
556 pmd_val(pmd) |= _PAGE_DIRTY;
557 return pmd;
558 }
559
560 #define pmd_young pmd_young
pmd_young(pmd_t pmd)561 static inline int pmd_young(pmd_t pmd)
562 {
563 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
564 }
565
pmd_mkold(pmd_t pmd)566 static inline pmd_t pmd_mkold(pmd_t pmd)
567 {
568 pmd_val(pmd) &= ~_PAGE_ACCESSED;
569 return pmd;
570 }
571
pmd_mkyoung(pmd_t pmd)572 static inline pmd_t pmd_mkyoung(pmd_t pmd)
573 {
574 pmd_val(pmd) |= _PAGE_ACCESSED;
575 return pmd;
576 }
577
pmd_page(pmd_t pmd)578 static inline struct page *pmd_page(pmd_t pmd)
579 {
580 if (pmd_trans_huge(pmd))
581 return pfn_to_page(pmd_pfn(pmd));
582
583 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
584 }
585
pmd_modify(pmd_t pmd,pgprot_t newprot)586 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
587 {
588 if (pmd_val(pmd) & _PAGE_DIRTY)
589 pmd_val(pmd) |= _PAGE_MODIFIED;
590
591 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) |
592 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK));
593 }
594
pmd_mkinvalid(pmd_t pmd)595 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
596 {
597 pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
598 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
599
600 return pmd;
601 }
602
603 /*
604 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
605 * different prototype.
606 */
607 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
pmdp_huge_get_and_clear(struct mm_struct * mm,unsigned long address,pmd_t * pmdp)608 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
609 unsigned long address, pmd_t *pmdp)
610 {
611 pmd_t old = pmdp_get(pmdp);
612
613 pmd_clear(pmdp);
614
615 return old;
616 }
617
618 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
619
620 #ifdef CONFIG_NUMA_BALANCING
pte_protnone(pte_t pte)621 static inline long pte_protnone(pte_t pte)
622 {
623 return (pte_val(pte) & _PAGE_PROTNONE);
624 }
625
pmd_protnone(pmd_t pmd)626 static inline long pmd_protnone(pmd_t pmd)
627 {
628 return (pmd_val(pmd) & _PAGE_PROTNONE);
629 }
630 #endif /* CONFIG_NUMA_BALANCING */
631
632 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
633 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
634
635 /*
636 * We provide our own get_unmapped area to cope with the virtual aliasing
637 * constraints placed on us by the cache architecture.
638 */
639 #define HAVE_ARCH_UNMAPPED_AREA
640 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
641
642 #endif /* !__ASSEMBLER__ */
643
644 #endif /* _ASM_PGTABLE_H */
645