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 #ifdef CONFIG_HIGHMEM
27 #include <asm/highmem.h>
28 #endif
29
30 #if CONFIG_PGTABLE_LEVELS == 2
31 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
32 #elif CONFIG_PGTABLE_LEVELS == 3
33 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
34 #define PMD_SIZE (1UL << PMD_SHIFT)
35 #define PMD_MASK (~(PMD_SIZE-1))
36 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG))
37 #elif CONFIG_PGTABLE_LEVELS == 4
38 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG))
39 #define PMD_SIZE (1UL << PMD_SHIFT)
40 #define PMD_MASK (~(PMD_SIZE-1))
41 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG))
42 #define PUD_SIZE (1UL << PUD_SHIFT)
43 #define PUD_MASK (~(PUD_SIZE-1))
44 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - PTRLOG))
45 #endif
46
47 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
48 #define PGDIR_MASK (~(PGDIR_SIZE-1))
49
50 #ifdef CONFIG_32BIT
51 #define VA_BITS 32
52 #else
53 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - PTRLOG))
54 #endif
55
56 #define PTRS_PER_PGD (PAGE_SIZE >> PTRLOG)
57 #if CONFIG_PGTABLE_LEVELS > 3
58 #define PTRS_PER_PUD (PAGE_SIZE >> PTRLOG)
59 #endif
60 #if CONFIG_PGTABLE_LEVELS > 2
61 #define PTRS_PER_PMD (PAGE_SIZE >> PTRLOG)
62 #endif
63 #define PTRS_PER_PTE (PAGE_SIZE >> PTRLOG)
64
65 #ifdef CONFIG_32BIT
66 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
67 #else
68 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
69 #endif
70
71 #ifndef __ASSEMBLER__
72
73 #include <linux/mm_types.h>
74 #include <linux/mmzone.h>
75 #include <asm/fixmap.h>
76 #include <asm/sparsemem.h>
77
78 struct mm_struct;
79 struct vm_area_struct;
80
81 #ifdef CONFIG_32BIT
82
83 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
84
85 #ifdef CONFIG_HIGHMEM
86 #define VMALLOC_END (PKMAP_BASE - (2 * PAGE_SIZE))
87 #else
88 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE))
89 #endif
90
91 #define PKMAP_BASE (PKMAP_END - (PAGE_SIZE * LAST_PKMAP))
92 #define PKMAP_END ((FIXADDR_START) & ~((LAST_PKMAP << PAGE_SHIFT)-1))
93
94 #endif
95
96 #ifdef CONFIG_64BIT
97
98 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
99 #define MODULES_END (MODULES_VADDR + SZ_2G) /* 256MB for text, rest for data */
100
101 #ifdef CONFIG_KFENCE
102 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
103 #else
104 #define KFENCE_AREA_SIZE 0
105 #endif
106
107 #define VMALLOC_START MODULES_END
108
109 #ifndef CONFIG_KASAN
110 #define VMALLOC_END \
111 (vm_map_base + \
112 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)
113 #else
114 #define VMALLOC_END \
115 (vm_map_base + \
116 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)
117 #endif
118
119 #define VMEMMAP_ALIGN max(PMD_SIZE, MAX_FOLIO_VMEMMAP_ALIGN)
120 #define vmemmap ((struct page *)(ALIGN(VMALLOC_END, VMEMMAP_ALIGN)))
121 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
122
123 #define KFENCE_AREA_START (VMEMMAP_END + 1)
124 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1)
125
126 #endif
127
128 /* Needed to limit get_free_mem_region() */
129 #ifndef CONFIG_SPARSEMEM
130 #define DIRECT_MAP_PHYSMEM_END ((1ULL << (cpu_pabits + 1)) - 1)
131 #else
132 #define DIRECT_MAP_PHYSMEM_END min((1ULL << (cpu_pabits + 1)) - 1, (1ULL << MAX_PHYSMEM_BITS) - 1)
133 #endif
134
135 #define ptep_get(ptep) READ_ONCE(*(ptep))
136 #define pmdp_get(pmdp) READ_ONCE(*(pmdp))
137
138 #define pte_ERROR(e) \
139 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
140 #ifndef __PAGETABLE_PMD_FOLDED
141 #define pmd_ERROR(e) \
142 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
143 #endif
144 #ifndef __PAGETABLE_PUD_FOLDED
145 #define pud_ERROR(e) \
146 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
147 #endif
148 #define pgd_ERROR(e) \
149 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
150
151 extern pte_t invalid_pte_table[PTRS_PER_PTE];
152
153 #ifndef __PAGETABLE_PUD_FOLDED
154
155 typedef struct { unsigned long pud; } pud_t;
156 #define pud_val(x) ((x).pud)
157 #define __pud(x) ((pud_t) { (x) })
158
159 extern pud_t invalid_pud_table[PTRS_PER_PUD];
160
161 /*
162 * Empty pgd/p4d entries point to the invalid_pud_table.
163 */
p4d_none(p4d_t p4d)164 static inline int p4d_none(p4d_t p4d)
165 {
166 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
167 }
168
p4d_bad(p4d_t p4d)169 static inline int p4d_bad(p4d_t p4d)
170 {
171 return p4d_val(p4d) & ~PAGE_MASK;
172 }
173
p4d_present(p4d_t p4d)174 static inline int p4d_present(p4d_t p4d)
175 {
176 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
177 }
178
p4d_pgtable(p4d_t p4d)179 static inline pud_t *p4d_pgtable(p4d_t p4d)
180 {
181 return (pud_t *)p4d_val(p4d);
182 }
183
set_p4d(p4d_t * p4d,p4d_t p4dval)184 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
185 {
186 WRITE_ONCE(*p4d, p4dval);
187 }
188
p4d_clear(p4d_t * p4dp)189 static inline void p4d_clear(p4d_t *p4dp)
190 {
191 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table));
192 }
193
194 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
195 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
196
197 #endif
198
199 #ifndef __PAGETABLE_PMD_FOLDED
200
201 typedef struct { unsigned long pmd; } pmd_t;
202 #define pmd_val(x) ((x).pmd)
203 #define __pmd(x) ((pmd_t) { (x) })
204
205 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
206
207 /*
208 * Empty pud entries point to the invalid_pmd_table.
209 */
pud_none(pud_t pud)210 static inline int pud_none(pud_t pud)
211 {
212 return pud_val(pud) == (unsigned long)invalid_pmd_table;
213 }
214
pud_bad(pud_t pud)215 static inline int pud_bad(pud_t pud)
216 {
217 return pud_val(pud) & ~PAGE_MASK;
218 }
219
pud_present(pud_t pud)220 static inline int pud_present(pud_t pud)
221 {
222 return pud_val(pud) != (unsigned long)invalid_pmd_table;
223 }
224
pud_pgtable(pud_t pud)225 static inline pmd_t *pud_pgtable(pud_t pud)
226 {
227 return (pmd_t *)pud_val(pud);
228 }
229
set_pud(pud_t * pud,pud_t pudval)230 static inline void set_pud(pud_t *pud, pud_t pudval)
231 {
232 WRITE_ONCE(*pud, pudval);
233 }
234
pud_clear(pud_t * pudp)235 static inline void pud_clear(pud_t *pudp)
236 {
237 set_pud(pudp, __pud((unsigned long)invalid_pmd_table));
238 }
239
240 #define pud_phys(pud) PHYSADDR(pud_val(pud))
241 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
242
243 #endif
244
245 /*
246 * Empty pmd entries point to the invalid_pte_table.
247 */
pmd_none(pmd_t pmd)248 static inline int pmd_none(pmd_t pmd)
249 {
250 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
251 }
252
pmd_bad(pmd_t pmd)253 static inline int pmd_bad(pmd_t pmd)
254 {
255 return (pmd_val(pmd) & ~PAGE_MASK);
256 }
257
pmd_present(pmd_t pmd)258 static inline int pmd_present(pmd_t pmd)
259 {
260 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
261 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
262
263 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
264 }
265
set_pmd(pmd_t * pmd,pmd_t pmdval)266 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval)
267 {
268 WRITE_ONCE(*pmd, pmdval);
269 }
270
pmd_clear(pmd_t * pmdp)271 static inline void pmd_clear(pmd_t *pmdp)
272 {
273 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table));
274 }
275
276 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
277
278 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
279 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
280 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
281
282 #define pmd_page_vaddr(pmd) pmd_val(pmd)
283
284 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
285
286 #define pte_page(x) pfn_to_page(pte_pfn(x))
287 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
288 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
289 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
290
291 /*
292 * Initialize a new pgd / pud / pmd table with invalid pointers.
293 */
294 extern void pgd_init(void *addr);
295 extern void pud_init(void *addr);
296 #define pud_init pud_init
297 extern void pmd_init(void *addr);
298 #define pmd_init pmd_init
299 extern void kernel_pte_init(void *addr);
300 #define kernel_pte_init kernel_pte_init
301
302 /*
303 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
304 * are !pte_none() && !pte_present().
305 *
306 * Format of 32bit swap PTEs:
307 *
308 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
309 * 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
310 * <------------ offset -------------> E <- type -> <-- zeroes -->
311 *
312 * E is the exclusive marker that is not stored in swap entries.
313 * The zero'ed bits include _PAGE_PRESENT.
314 *
315 * Format of 64bit swap PTEs:
316 *
317 * 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
318 * 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
319 * <--------------------------- offset ---------------------------
320 *
321 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
322 * 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
323 * --------------> E <--- type ---> <---------- zeroes ---------->
324 *
325 * E is the exclusive marker that is not stored in swap entries.
326 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
327 */
328
329 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7)
330 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1)
331 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16)
332 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1)
333
mk_swap_pte(unsigned long type,unsigned long offset)334 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
335 {
336 pte_t pte;
337 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT);
338 return pte;
339 }
340
341 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
342 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
343 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
344
345 #define __swp_entry_to_pte(x) __pte((x).val)
346 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE)
347 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
348 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
349
pte_swp_exclusive(pte_t pte)350 static inline bool pte_swp_exclusive(pte_t pte)
351 {
352 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
353 }
354
pte_swp_mkexclusive(pte_t pte)355 static inline pte_t pte_swp_mkexclusive(pte_t pte)
356 {
357 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
358 return pte;
359 }
360
pte_swp_clear_exclusive(pte_t pte)361 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
362 {
363 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
364 return pte;
365 }
366
367 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
368 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
369 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
370
set_pte(pte_t * ptep,pte_t pteval)371 static inline void set_pte(pte_t *ptep, pte_t pteval)
372 {
373 WRITE_ONCE(*ptep, pteval);
374
375 #ifdef CONFIG_SMP
376 if (pte_val(pteval) & _PAGE_GLOBAL)
377 DBAR(0b11000); /* o_wrw = 0b11000 */
378 #endif
379 }
380
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)381 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
382 {
383 pte_t pte = ptep_get(ptep);
384 pte_val(pte) &= _PAGE_GLOBAL;
385 set_pte(ptep, pte);
386 }
387
388 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
389 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
390 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
391
392 extern pgd_t swapper_pg_dir[];
393 extern pgd_t invalid_pg_dir[];
394
395 /*
396 * The following only work if pte_present() is true.
397 * Undefined behaviour if not..
398 */
pte_write(pte_t pte)399 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
pte_young(pte_t pte)400 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
pte_dirty(pte_t pte)401 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
402
pte_mkold(pte_t pte)403 static inline pte_t pte_mkold(pte_t pte)
404 {
405 pte_val(pte) &= ~_PAGE_ACCESSED;
406 return pte;
407 }
408
pte_mkyoung(pte_t pte)409 static inline pte_t pte_mkyoung(pte_t pte)
410 {
411 pte_val(pte) |= _PAGE_ACCESSED;
412 return pte;
413 }
414
pte_mkclean(pte_t pte)415 static inline pte_t pte_mkclean(pte_t pte)
416 {
417 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
418 return pte;
419 }
420
pte_mkdirty(pte_t pte)421 static inline pte_t pte_mkdirty(pte_t pte)
422 {
423 pte_val(pte) |= _PAGE_MODIFIED;
424 if (pte_val(pte) & _PAGE_WRITE)
425 pte_val(pte) |= _PAGE_DIRTY;
426 return pte;
427 }
428
pte_mkwrite_novma(pte_t pte)429 static inline pte_t pte_mkwrite_novma(pte_t pte)
430 {
431 pte_val(pte) |= _PAGE_WRITE;
432 if (pte_val(pte) & _PAGE_MODIFIED)
433 pte_val(pte) |= _PAGE_DIRTY;
434 return pte;
435 }
436
pte_wrprotect(pte_t pte)437 static inline pte_t pte_wrprotect(pte_t pte)
438 {
439 if (pte_val(pte) & _PAGE_DIRTY)
440 pte_val(pte) |= _PAGE_MODIFIED;
441 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
442 return pte;
443 }
444
pte_huge(pte_t pte)445 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
446
pte_mkhuge(pte_t pte)447 static inline pte_t pte_mkhuge(pte_t pte)
448 {
449 pte_val(pte) |= _PAGE_HUGE;
450 return pte;
451 }
452
453 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
pte_special(pte_t pte)454 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
pte_mkspecial(pte_t pte)455 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
456 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
457
458 #define pte_accessible pte_accessible
pte_accessible(struct mm_struct * mm,pte_t a)459 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
460 {
461 if (pte_val(a) & _PAGE_PRESENT)
462 return true;
463
464 if ((pte_val(a) & _PAGE_PROTNONE) &&
465 atomic_read(&mm->tlb_flush_pending))
466 return true;
467
468 return false;
469 }
470
pte_modify(pte_t pte,pgprot_t newprot)471 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
472 {
473 if (pte_val(pte) & _PAGE_DIRTY)
474 pte_val(pte) |= _PAGE_MODIFIED;
475
476 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
477 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
478 }
479
480 extern void __update_tlb(struct vm_area_struct *vma,
481 unsigned long address, pte_t *ptep);
482
update_mmu_cache_range(struct vm_fault * vmf,struct vm_area_struct * vma,unsigned long address,pte_t * ptep,unsigned int nr)483 static inline void update_mmu_cache_range(struct vm_fault *vmf,
484 struct vm_area_struct *vma, unsigned long address,
485 pte_t *ptep, unsigned int nr)
486 {
487 for (;;) {
488 __update_tlb(vma, address, ptep);
489 if (--nr == 0)
490 break;
491 address += PAGE_SIZE;
492 ptep++;
493 }
494 }
495 #define update_mmu_cache(vma, addr, ptep) \
496 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
497
498 #define update_mmu_tlb_range(vma, addr, ptep, nr) \
499 update_mmu_cache_range(NULL, vma, addr, ptep, nr)
500
update_mmu_cache_pmd(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)501 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
502 unsigned long address, pmd_t *pmdp)
503 {
504 __update_tlb(vma, address, (pte_t *)pmdp);
505 }
506
pmd_pfn(pmd_t pmd)507 static inline unsigned long pmd_pfn(pmd_t pmd)
508 {
509 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
510 }
511
512 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
513
514 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
515 #define pmdp_establish generic_pmdp_establish
516
pmd_trans_huge(pmd_t pmd)517 static inline int pmd_trans_huge(pmd_t pmd)
518 {
519 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
520 }
521
pmd_mkhuge(pmd_t pmd)522 static inline pmd_t pmd_mkhuge(pmd_t pmd)
523 {
524 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
525 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
526 pmd_val(pmd) |= _PAGE_HUGE;
527
528 return pmd;
529 }
530
531 #define pmd_write pmd_write
pmd_write(pmd_t pmd)532 static inline int pmd_write(pmd_t pmd)
533 {
534 return !!(pmd_val(pmd) & _PAGE_WRITE);
535 }
536
pmd_mkwrite_novma(pmd_t pmd)537 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
538 {
539 pmd_val(pmd) |= _PAGE_WRITE;
540 if (pmd_val(pmd) & _PAGE_MODIFIED)
541 pmd_val(pmd) |= _PAGE_DIRTY;
542 return pmd;
543 }
544
pmd_wrprotect(pmd_t pmd)545 static inline pmd_t pmd_wrprotect(pmd_t pmd)
546 {
547 if (pmd_val(pmd) & _PAGE_DIRTY)
548 pmd_val(pmd) |= _PAGE_MODIFIED;
549 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
550 return pmd;
551 }
552
553 #define pmd_dirty pmd_dirty
pmd_dirty(pmd_t pmd)554 static inline int pmd_dirty(pmd_t pmd)
555 {
556 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
557 }
558
pmd_mkclean(pmd_t pmd)559 static inline pmd_t pmd_mkclean(pmd_t pmd)
560 {
561 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
562 return pmd;
563 }
564
pmd_mkdirty(pmd_t pmd)565 static inline pmd_t pmd_mkdirty(pmd_t pmd)
566 {
567 pmd_val(pmd) |= _PAGE_MODIFIED;
568 if (pmd_val(pmd) & _PAGE_WRITE)
569 pmd_val(pmd) |= _PAGE_DIRTY;
570 return pmd;
571 }
572
573 #define pmd_young pmd_young
pmd_young(pmd_t pmd)574 static inline int pmd_young(pmd_t pmd)
575 {
576 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
577 }
578
pmd_mkold(pmd_t pmd)579 static inline pmd_t pmd_mkold(pmd_t pmd)
580 {
581 pmd_val(pmd) &= ~_PAGE_ACCESSED;
582 return pmd;
583 }
584
pmd_mkyoung(pmd_t pmd)585 static inline pmd_t pmd_mkyoung(pmd_t pmd)
586 {
587 pmd_val(pmd) |= _PAGE_ACCESSED;
588 return pmd;
589 }
590
pmd_page(pmd_t pmd)591 static inline struct page *pmd_page(pmd_t pmd)
592 {
593 if (pmd_trans_huge(pmd))
594 return pfn_to_page(pmd_pfn(pmd));
595
596 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
597 }
598
pmd_modify(pmd_t pmd,pgprot_t newprot)599 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
600 {
601 if (pmd_val(pmd) & _PAGE_DIRTY)
602 pmd_val(pmd) |= _PAGE_MODIFIED;
603
604 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) |
605 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK));
606 }
607
pmd_mkinvalid(pmd_t pmd)608 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
609 {
610 pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
611 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
612
613 return pmd;
614 }
615
616 /*
617 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
618 * different prototype.
619 */
620 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
pmdp_huge_get_and_clear(struct mm_struct * mm,unsigned long address,pmd_t * pmdp)621 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
622 unsigned long address, pmd_t *pmdp)
623 {
624 pmd_t old = pmdp_get(pmdp);
625
626 pmd_clear(pmdp);
627
628 return old;
629 }
630
631 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
632
633 #ifdef CONFIG_ARCH_HAS_PTE_PROTNONE
pte_protnone(pte_t pte)634 static inline long pte_protnone(pte_t pte)
635 {
636 return (pte_val(pte) & _PAGE_PROTNONE);
637 }
638
pmd_protnone(pmd_t pmd)639 static inline long pmd_protnone(pmd_t pmd)
640 {
641 return (pmd_val(pmd) & _PAGE_PROTNONE);
642 }
643 #endif /* CONFIG_ARCH_HAS_PTE_PROTNONE */
644
645 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
646 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
647
648 /*
649 * We provide our own get_unmapped area to cope with the virtual aliasing
650 * constraints placed on us by the cache architecture.
651 */
652 #define HAVE_ARCH_UNMAPPED_AREA
653 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
654
655 #endif /* !__ASSEMBLER__ */
656
657 #endif /* _ASM_PGTABLE_H */
658