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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003 Ralf Baechle
7 */
8#ifndef _ASM_PGTABLE_H
9#define _ASM_PGTABLE_H
10
11#include <linux/mm_types.h>
12#include <linux/mmzone.h>
13#ifdef CONFIG_32BIT
14#include <asm/pgtable-32.h>
15#endif
16#ifdef CONFIG_64BIT
17#include <asm/pgtable-64.h>
18#endif
19
20#include <asm/cmpxchg.h>
21#include <asm/io.h>
22#include <asm/pgtable-bits.h>
23#include <asm/cpu-features.h>
24
25struct mm_struct;
26struct vm_area_struct;
27
28#define PAGE_SHARED vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED)
29
30#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | _page_cachable_default)
32#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
34#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
36
37/*
38 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
39 * execute, and consider it to be the same as read. Also, write
40 * permissions imply read permissions. This is the closest we can get
41 * by reasonable means..
42 */
43
44extern unsigned long _page_cachable_default;
45extern void __update_cache(unsigned long address, pte_t pte);
46
47/*
48 * ZERO_PAGE is a global shared page that is always zero; used
49 * for zero-mapped memory areas etc..
50 */
51
52extern unsigned long empty_zero_page;
53extern unsigned long zero_page_mask;
54
55#define ZERO_PAGE(vaddr) \
56 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
57#define __HAVE_COLOR_ZERO_PAGE
58
59extern void paging_init(void);
60
61/*
62 * Conversion functions: convert a page and protection to a page entry,
63 * and a page entry and page directory to the page they refer to.
64 */
65#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
66
67static inline unsigned long pmd_pfn(pmd_t pmd)
68{
69 return pmd_val(pmd) >> _PFN_SHIFT;
70}
71
72#ifndef CONFIG_MIPS_HUGE_TLB_SUPPORT
73#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
74#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
75
76#define pmd_page_vaddr(pmd) pmd_val(pmd)
77
78#define htw_stop() \
79do { \
80 unsigned long __flags; \
81 \
82 if (cpu_has_htw) { \
83 local_irq_save(__flags); \
84 if(!raw_current_cpu_data.htw_seq++) { \
85 write_c0_pwctl(read_c0_pwctl() & \
86 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
87 back_to_back_c0_hazard(); \
88 } \
89 local_irq_restore(__flags); \
90 } \
91} while(0)
92
93#define htw_start() \
94do { \
95 unsigned long __flags; \
96 \
97 if (cpu_has_htw) { \
98 local_irq_save(__flags); \
99 if (!--raw_current_cpu_data.htw_seq) { \
100 write_c0_pwctl(read_c0_pwctl() | \
101 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
102 back_to_back_c0_hazard(); \
103 } \
104 local_irq_restore(__flags); \
105 } \
106} while(0)
107
108static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
109 pte_t *ptep, pte_t pteval);
110
111#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
112
113#ifdef CONFIG_XPA
114# define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
115#else
116# define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
117#endif
118
119#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
120#define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
121
122static inline void set_pte(pte_t *ptep, pte_t pte)
123{
124 ptep->pte_high = pte.pte_high;
125 smp_wmb();
126 ptep->pte_low = pte.pte_low;
127
128#ifdef CONFIG_XPA
129 if (pte.pte_high & _PAGE_GLOBAL) {
130#else
131 if (pte.pte_low & _PAGE_GLOBAL) {
132#endif
133 pte_t *buddy = ptep_buddy(ptep);
134 /*
135 * Make sure the buddy is global too (if it's !none,
136 * it better already be global)
137 */
138 if (pte_none(*buddy)) {
139 if (!IS_ENABLED(CONFIG_XPA))
140 buddy->pte_low |= _PAGE_GLOBAL;
141 buddy->pte_high |= _PAGE_GLOBAL;
142 }
143 }
144}
145
146static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
147{
148 pte_t null = __pte(0);
149
150 htw_stop();
151 /* Preserve global status for the pair */
152 if (IS_ENABLED(CONFIG_XPA)) {
153 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
154 null.pte_high = _PAGE_GLOBAL;
155 } else {
156 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
157 null.pte_low = null.pte_high = _PAGE_GLOBAL;
158 }
159
160 set_pte_at(mm, addr, ptep, null);
161 htw_start();
162}
163#else
164
165#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
166#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
167#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
168
169/*
170 * Certain architectures need to do special things when pte's
171 * within a page table are directly modified. Thus, the following
172 * hook is made available.
173 */
174static inline void set_pte(pte_t *ptep, pte_t pteval)
175{
176 *ptep = pteval;
177#if !defined(CONFIG_CPU_R3K_TLB)
178 if (pte_val(pteval) & _PAGE_GLOBAL) {
179 pte_t *buddy = ptep_buddy(ptep);
180 /*
181 * Make sure the buddy is global too (if it's !none,
182 * it better already be global)
183 */
184# if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
185 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
186# else
187 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
188# endif
189 }
190#endif
191}
192
193static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
194{
195 htw_stop();
196#if !defined(CONFIG_CPU_R3K_TLB)
197 /* Preserve global status for the pair */
198 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
199 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
200 else
201#endif
202 set_pte_at(mm, addr, ptep, __pte(0));
203 htw_start();
204}
205#endif
206
207static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
208 pte_t *ptep, pte_t pteval)
209{
210
211 if (!pte_present(pteval))
212 goto cache_sync_done;
213
214 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
215 goto cache_sync_done;
216
217 __update_cache(addr, pteval);
218cache_sync_done:
219 set_pte(ptep, pteval);
220}
221
222/*
223 * (pmds are folded into puds so this doesn't get actually called,
224 * but the define is needed for a generic inline function.)
225 */
226#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
227
228#ifndef __PAGETABLE_PMD_FOLDED
229/*
230 * (puds are folded into pgds so this doesn't get actually called,
231 * but the define is needed for a generic inline function.)
232 */
233#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
234#endif
235
236#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
237#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
238#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
239
240/*
241 * We used to declare this array with size but gcc 3.3 and older are not able
242 * to find that this expression is a constant, so the size is dropped.
243 */
244extern pgd_t swapper_pg_dir[];
245
246/*
247 * Platform specific pte_special() and pte_mkspecial() definitions
248 * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
249 */
250#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
251#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
252static inline int pte_special(pte_t pte)
253{
254 return pte.pte_low & _PAGE_SPECIAL;
255}
256
257static inline pte_t pte_mkspecial(pte_t pte)
258{
259 pte.pte_low |= _PAGE_SPECIAL;
260 return pte;
261}
262#else
263static inline int pte_special(pte_t pte)
264{
265 return pte_val(pte) & _PAGE_SPECIAL;
266}
267
268static inline pte_t pte_mkspecial(pte_t pte)
269{
270 pte_val(pte) |= _PAGE_SPECIAL;
271 return pte;
272}
273#endif
274#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
275
276/*
277 * The following only work if pte_present() is true.
278 * Undefined behaviour if not..
279 */
280#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
281static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
282static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
283static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
284
285static inline pte_t pte_wrprotect(pte_t pte)
286{
287 pte.pte_low &= ~_PAGE_WRITE;
288 if (!IS_ENABLED(CONFIG_XPA))
289 pte.pte_low &= ~_PAGE_SILENT_WRITE;
290 pte.pte_high &= ~_PAGE_SILENT_WRITE;
291 return pte;
292}
293
294static inline pte_t pte_mkclean(pte_t pte)
295{
296 pte.pte_low &= ~_PAGE_MODIFIED;
297 if (!IS_ENABLED(CONFIG_XPA))
298 pte.pte_low &= ~_PAGE_SILENT_WRITE;
299 pte.pte_high &= ~_PAGE_SILENT_WRITE;
300 return pte;
301}
302
303static inline pte_t pte_mkold(pte_t pte)
304{
305 pte.pte_low &= ~_PAGE_ACCESSED;
306 if (!IS_ENABLED(CONFIG_XPA))
307 pte.pte_low &= ~_PAGE_SILENT_READ;
308 pte.pte_high &= ~_PAGE_SILENT_READ;
309 return pte;
310}
311
312static inline pte_t pte_mkwrite(pte_t pte)
313{
314 pte.pte_low |= _PAGE_WRITE;
315 if (pte.pte_low & _PAGE_MODIFIED) {
316 if (!IS_ENABLED(CONFIG_XPA))
317 pte.pte_low |= _PAGE_SILENT_WRITE;
318 pte.pte_high |= _PAGE_SILENT_WRITE;
319 }
320 return pte;
321}
322
323static inline pte_t pte_mkdirty(pte_t pte)
324{
325 pte.pte_low |= _PAGE_MODIFIED;
326 if (pte.pte_low & _PAGE_WRITE) {
327 if (!IS_ENABLED(CONFIG_XPA))
328 pte.pte_low |= _PAGE_SILENT_WRITE;
329 pte.pte_high |= _PAGE_SILENT_WRITE;
330 }
331 return pte;
332}
333
334static inline pte_t pte_mkyoung(pte_t pte)
335{
336 pte.pte_low |= _PAGE_ACCESSED;
337 if (!(pte.pte_low & _PAGE_NO_READ)) {
338 if (!IS_ENABLED(CONFIG_XPA))
339 pte.pte_low |= _PAGE_SILENT_READ;
340 pte.pte_high |= _PAGE_SILENT_READ;
341 }
342 return pte;
343}
344#else
345static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
346static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
347static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
348
349static inline pte_t pte_wrprotect(pte_t pte)
350{
351 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
352 return pte;
353}
354
355static inline pte_t pte_mkclean(pte_t pte)
356{
357 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
358 return pte;
359}
360
361static inline pte_t pte_mkold(pte_t pte)
362{
363 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
364 return pte;
365}
366
367static inline pte_t pte_mkwrite(pte_t pte)
368{
369 pte_val(pte) |= _PAGE_WRITE;
370 if (pte_val(pte) & _PAGE_MODIFIED)
371 pte_val(pte) |= _PAGE_SILENT_WRITE;
372 return pte;
373}
374
375static inline pte_t pte_mkdirty(pte_t pte)
376{
377 pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
378 if (pte_val(pte) & _PAGE_WRITE)
379 pte_val(pte) |= _PAGE_SILENT_WRITE;
380 return pte;
381}
382
383static inline pte_t pte_mkyoung(pte_t pte)
384{
385 pte_val(pte) |= _PAGE_ACCESSED;
386 if (!(pte_val(pte) & _PAGE_NO_READ))
387 pte_val(pte) |= _PAGE_SILENT_READ;
388 return pte;
389}
390
391#define pte_sw_mkyoung pte_mkyoung
392
393#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
394static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
395
396static inline pte_t pte_mkhuge(pte_t pte)
397{
398 pte_val(pte) |= _PAGE_HUGE;
399 return pte;
400}
401
402#define pmd_write pmd_write
403static inline int pmd_write(pmd_t pmd)
404{
405 return !!(pmd_val(pmd) & _PAGE_WRITE);
406}
407
408static inline struct page *pmd_page(pmd_t pmd)
409{
410 if (pmd_val(pmd) & _PAGE_HUGE)
411 return pfn_to_page(pmd_pfn(pmd));
412
413 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
414}
415#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
416
417#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
418static inline bool pte_soft_dirty(pte_t pte)
419{
420 return pte_val(pte) & _PAGE_SOFT_DIRTY;
421}
422#define pte_swp_soft_dirty pte_soft_dirty
423
424static inline pte_t pte_mksoft_dirty(pte_t pte)
425{
426 pte_val(pte) |= _PAGE_SOFT_DIRTY;
427 return pte;
428}
429#define pte_swp_mksoft_dirty pte_mksoft_dirty
430
431static inline pte_t pte_clear_soft_dirty(pte_t pte)
432{
433 pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);
434 return pte;
435}
436#define pte_swp_clear_soft_dirty pte_clear_soft_dirty
437
438#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
439
440#endif
441
442/*
443 * Macro to make mark a page protection value as "uncacheable". Note
444 * that "protection" is really a misnomer here as the protection value
445 * contains the memory attribute bits, dirty bits, and various other
446 * bits as well.
447 */
448#define pgprot_noncached pgprot_noncached
449
450static inline pgprot_t pgprot_noncached(pgprot_t _prot)
451{
452 unsigned long prot = pgprot_val(_prot);
453
454 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
455
456 return __pgprot(prot);
457}
458
459#define pgprot_writecombine pgprot_writecombine
460
461static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
462{
463 unsigned long prot = pgprot_val(_prot);
464
465 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
466 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
467
468 return __pgprot(prot);
469}
470
471static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
472 unsigned long address)
473{
474}
475
476#define __HAVE_ARCH_PTE_SAME
477static inline int pte_same(pte_t pte_a, pte_t pte_b)
478{
479 return pte_val(pte_a) == pte_val(pte_b);
480}
481
482#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
483static inline int ptep_set_access_flags(struct vm_area_struct *vma,
484 unsigned long address, pte_t *ptep,
485 pte_t entry, int dirty)
486{
487 if (!pte_same(*ptep, entry))
488 set_pte_at(vma->vm_mm, address, ptep, entry);
489 /*
490 * update_mmu_cache will unconditionally execute, handling both
491 * the case that the PTE changed and the spurious fault case.
492 */
493 return true;
494}
495
496/*
497 * Conversion functions: convert a page and protection to a page entry,
498 * and a page entry and page directory to the page they refer to.
499 */
500#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
501
502#if defined(CONFIG_XPA)
503static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
504{
505 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
506 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
507 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
508 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
509 return pte;
510}
511#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
512static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
513{
514 pte.pte_low &= _PAGE_CHG_MASK;
515 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
516 pte.pte_low |= pgprot_val(newprot);
517 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
518 return pte;
519}
520#else
521static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
522{
523 pte_val(pte) &= _PAGE_CHG_MASK;
524 pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
525 if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
526 pte_val(pte) |= _PAGE_SILENT_READ;
527 return pte;
528}
529#endif
530
531
532extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
533 pte_t pte);
534
535static inline void update_mmu_cache(struct vm_area_struct *vma,
536 unsigned long address, pte_t *ptep)
537{
538 pte_t pte = *ptep;
539 __update_tlb(vma, address, pte);
540}
541
542#define __HAVE_ARCH_UPDATE_MMU_TLB
543#define update_mmu_tlb update_mmu_cache
544
545static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
546 unsigned long address, pmd_t *pmdp)
547{
548 pte_t pte = *(pte_t *)pmdp;
549
550 __update_tlb(vma, address, pte);
551}
552
553/*
554 * Allow physical addresses to be fixed up to help 36-bit peripherals.
555 */
556#ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
557phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size);
558int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
559 unsigned long pfn, unsigned long size, pgprot_t prot);
560#define io_remap_pfn_range io_remap_pfn_range
561#else
562#define fixup_bigphys_addr(addr, size) (addr)
563#endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */
564
565#ifdef CONFIG_TRANSPARENT_HUGEPAGE
566
567/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
568#define pmdp_establish generic_pmdp_establish
569
570#define has_transparent_hugepage has_transparent_hugepage
571extern int has_transparent_hugepage(void);
572
573static inline int pmd_trans_huge(pmd_t pmd)
574{
575 return !!(pmd_val(pmd) & _PAGE_HUGE);
576}
577
578static inline pmd_t pmd_mkhuge(pmd_t pmd)
579{
580 pmd_val(pmd) |= _PAGE_HUGE;
581
582 return pmd;
583}
584
585extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
586 pmd_t *pmdp, pmd_t pmd);
587
588static inline pmd_t pmd_wrprotect(pmd_t pmd)
589{
590 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
591 return pmd;
592}
593
594static inline pmd_t pmd_mkwrite(pmd_t pmd)
595{
596 pmd_val(pmd) |= _PAGE_WRITE;
597 if (pmd_val(pmd) & _PAGE_MODIFIED)
598 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
599
600 return pmd;
601}
602
603static inline int pmd_dirty(pmd_t pmd)
604{
605 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
606}
607
608static inline pmd_t pmd_mkclean(pmd_t pmd)
609{
610 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
611 return pmd;
612}
613
614static inline pmd_t pmd_mkdirty(pmd_t pmd)
615{
616 pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
617 if (pmd_val(pmd) & _PAGE_WRITE)
618 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
619
620 return pmd;
621}
622
623#define pmd_young pmd_young
624static inline int pmd_young(pmd_t pmd)
625{
626 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
627}
628
629static inline pmd_t pmd_mkold(pmd_t pmd)
630{
631 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
632
633 return pmd;
634}
635
636static inline pmd_t pmd_mkyoung(pmd_t pmd)
637{
638 pmd_val(pmd) |= _PAGE_ACCESSED;
639
640 if (!(pmd_val(pmd) & _PAGE_NO_READ))
641 pmd_val(pmd) |= _PAGE_SILENT_READ;
642
643 return pmd;
644}
645
646#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
647static inline int pmd_soft_dirty(pmd_t pmd)
648{
649 return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY);
650}
651
652static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
653{
654 pmd_val(pmd) |= _PAGE_SOFT_DIRTY;
655 return pmd;
656}
657
658static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
659{
660 pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY);
661 return pmd;
662}
663
664#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
665
666/* Extern to avoid header file madness */
667extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
668
669static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
670{
671 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
672 (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
673 return pmd;
674}
675
676static inline pmd_t pmd_mkinvalid(pmd_t pmd)
677{
678 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
679
680 return pmd;
681}
682
683/*
684 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
685 * different prototype.
686 */
687#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
688static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
689 unsigned long address, pmd_t *pmdp)
690{
691 pmd_t old = *pmdp;
692
693 pmd_clear(pmdp);
694
695 return old;
696}
697
698#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
699
700#ifdef _PAGE_HUGE
701#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
702#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
703#endif
704
705#define gup_fast_permitted(start, end) (!cpu_has_dc_aliases)
706
707/*
708 * We provide our own get_unmapped area to cope with the virtual aliasing
709 * constraints placed on us by the cache architecture.
710 */
711#define HAVE_ARCH_UNMAPPED_AREA
712#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
713
714#endif /* _ASM_PGTABLE_H */
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003 Ralf Baechle
7 */
8#ifndef _ASM_PGTABLE_H
9#define _ASM_PGTABLE_H
10
11#ifdef CONFIG_32BIT
12#include <asm/pgtable-32.h>
13#endif
14#ifdef CONFIG_64BIT
15#include <asm/pgtable-64.h>
16#endif
17
18#include <asm/io.h>
19#include <asm/pgtable-bits.h>
20
21struct mm_struct;
22struct vm_area_struct;
23
24#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
26 _page_cachable_default)
27#define PAGE_COPY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
28 (kernel_uses_smartmips_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default)
29#define PAGE_READONLY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
30 _page_cachable_default)
31#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
32 _PAGE_GLOBAL | _page_cachable_default)
33#define PAGE_USERIO __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
34 _page_cachable_default)
35#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
37
38/*
39 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
40 * execute, and consider it to be the same as read. Also, write
41 * permissions imply read permissions. This is the closest we can get
42 * by reasonable means..
43 */
44
45/*
46 * Dummy values to fill the table in mmap.c
47 * The real values will be generated at runtime
48 */
49#define __P000 __pgprot(0)
50#define __P001 __pgprot(0)
51#define __P010 __pgprot(0)
52#define __P011 __pgprot(0)
53#define __P100 __pgprot(0)
54#define __P101 __pgprot(0)
55#define __P110 __pgprot(0)
56#define __P111 __pgprot(0)
57
58#define __S000 __pgprot(0)
59#define __S001 __pgprot(0)
60#define __S010 __pgprot(0)
61#define __S011 __pgprot(0)
62#define __S100 __pgprot(0)
63#define __S101 __pgprot(0)
64#define __S110 __pgprot(0)
65#define __S111 __pgprot(0)
66
67extern unsigned long _page_cachable_default;
68
69/*
70 * ZERO_PAGE is a global shared page that is always zero; used
71 * for zero-mapped memory areas etc..
72 */
73
74extern unsigned long empty_zero_page;
75extern unsigned long zero_page_mask;
76
77#define ZERO_PAGE(vaddr) \
78 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
79
80#define is_zero_pfn is_zero_pfn
81static inline int is_zero_pfn(unsigned long pfn)
82{
83 extern unsigned long zero_pfn;
84 unsigned long offset_from_zero_pfn = pfn - zero_pfn;
85 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
86}
87
88#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
89
90extern void paging_init(void);
91
92/*
93 * Conversion functions: convert a page and protection to a page entry,
94 * and a page entry and page directory to the page they refer to.
95 */
96#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
97#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
98#define pmd_page_vaddr(pmd) pmd_val(pmd)
99
100#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
101
102#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
103#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
104
105static inline void set_pte(pte_t *ptep, pte_t pte)
106{
107 ptep->pte_high = pte.pte_high;
108 smp_wmb();
109 ptep->pte_low = pte.pte_low;
110 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
111
112 if (pte.pte_low & _PAGE_GLOBAL) {
113 pte_t *buddy = ptep_buddy(ptep);
114 /*
115 * Make sure the buddy is global too (if it's !none,
116 * it better already be global)
117 */
118 if (pte_none(*buddy)) {
119 buddy->pte_low |= _PAGE_GLOBAL;
120 buddy->pte_high |= _PAGE_GLOBAL;
121 }
122 }
123}
124#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
125
126static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
127{
128 pte_t null = __pte(0);
129
130 /* Preserve global status for the pair */
131 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
132 null.pte_low = null.pte_high = _PAGE_GLOBAL;
133
134 set_pte_at(mm, addr, ptep, null);
135}
136#else
137
138#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
139#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
140
141/*
142 * Certain architectures need to do special things when pte's
143 * within a page table are directly modified. Thus, the following
144 * hook is made available.
145 */
146static inline void set_pte(pte_t *ptep, pte_t pteval)
147{
148 *ptep = pteval;
149#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
150 if (pte_val(pteval) & _PAGE_GLOBAL) {
151 pte_t *buddy = ptep_buddy(ptep);
152 /*
153 * Make sure the buddy is global too (if it's !none,
154 * it better already be global)
155 */
156 if (pte_none(*buddy))
157 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
158 }
159#endif
160}
161#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
162
163static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
164{
165#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
166 /* Preserve global status for the pair */
167 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
168 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
169 else
170#endif
171 set_pte_at(mm, addr, ptep, __pte(0));
172}
173#endif
174
175/*
176 * (pmds are folded into puds so this doesn't get actually called,
177 * but the define is needed for a generic inline function.)
178 */
179#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
180
181#ifndef __PAGETABLE_PMD_FOLDED
182/*
183 * (puds are folded into pgds so this doesn't get actually called,
184 * but the define is needed for a generic inline function.)
185 */
186#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
187#endif
188
189#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
190#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
191#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
192
193/*
194 * We used to declare this array with size but gcc 3.3 and older are not able
195 * to find that this expression is a constant, so the size is dropped.
196 */
197extern pgd_t swapper_pg_dir[];
198
199/*
200 * The following only work if pte_present() is true.
201 * Undefined behaviour if not..
202 */
203#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
204static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
205static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
206static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
207static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
208
209static inline pte_t pte_wrprotect(pte_t pte)
210{
211 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
212 pte.pte_high &= ~_PAGE_SILENT_WRITE;
213 return pte;
214}
215
216static inline pte_t pte_mkclean(pte_t pte)
217{
218 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
219 pte.pte_high &= ~_PAGE_SILENT_WRITE;
220 return pte;
221}
222
223static inline pte_t pte_mkold(pte_t pte)
224{
225 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
226 pte.pte_high &= ~_PAGE_SILENT_READ;
227 return pte;
228}
229
230static inline pte_t pte_mkwrite(pte_t pte)
231{
232 pte.pte_low |= _PAGE_WRITE;
233 if (pte.pte_low & _PAGE_MODIFIED) {
234 pte.pte_low |= _PAGE_SILENT_WRITE;
235 pte.pte_high |= _PAGE_SILENT_WRITE;
236 }
237 return pte;
238}
239
240static inline pte_t pte_mkdirty(pte_t pte)
241{
242 pte.pte_low |= _PAGE_MODIFIED;
243 if (pte.pte_low & _PAGE_WRITE) {
244 pte.pte_low |= _PAGE_SILENT_WRITE;
245 pte.pte_high |= _PAGE_SILENT_WRITE;
246 }
247 return pte;
248}
249
250static inline pte_t pte_mkyoung(pte_t pte)
251{
252 pte.pte_low |= _PAGE_ACCESSED;
253 if (pte.pte_low & _PAGE_READ) {
254 pte.pte_low |= _PAGE_SILENT_READ;
255 pte.pte_high |= _PAGE_SILENT_READ;
256 }
257 return pte;
258}
259#else
260static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
261static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
262static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
263static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
264
265static inline pte_t pte_wrprotect(pte_t pte)
266{
267 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
268 return pte;
269}
270
271static inline pte_t pte_mkclean(pte_t pte)
272{
273 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
274 return pte;
275}
276
277static inline pte_t pte_mkold(pte_t pte)
278{
279 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
280 return pte;
281}
282
283static inline pte_t pte_mkwrite(pte_t pte)
284{
285 pte_val(pte) |= _PAGE_WRITE;
286 if (pte_val(pte) & _PAGE_MODIFIED)
287 pte_val(pte) |= _PAGE_SILENT_WRITE;
288 return pte;
289}
290
291static inline pte_t pte_mkdirty(pte_t pte)
292{
293 pte_val(pte) |= _PAGE_MODIFIED;
294 if (pte_val(pte) & _PAGE_WRITE)
295 pte_val(pte) |= _PAGE_SILENT_WRITE;
296 return pte;
297}
298
299static inline pte_t pte_mkyoung(pte_t pte)
300{
301 pte_val(pte) |= _PAGE_ACCESSED;
302 if (kernel_uses_smartmips_rixi) {
303 if (!(pte_val(pte) & _PAGE_NO_READ))
304 pte_val(pte) |= _PAGE_SILENT_READ;
305 } else {
306 if (pte_val(pte) & _PAGE_READ)
307 pte_val(pte) |= _PAGE_SILENT_READ;
308 }
309 return pte;
310}
311
312#ifdef _PAGE_HUGE
313static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
314
315static inline pte_t pte_mkhuge(pte_t pte)
316{
317 pte_val(pte) |= _PAGE_HUGE;
318 return pte;
319}
320#endif /* _PAGE_HUGE */
321#endif
322static inline int pte_special(pte_t pte) { return 0; }
323static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
324
325/*
326 * Macro to make mark a page protection value as "uncacheable". Note
327 * that "protection" is really a misnomer here as the protection value
328 * contains the memory attribute bits, dirty bits, and various other
329 * bits as well.
330 */
331#define pgprot_noncached pgprot_noncached
332
333static inline pgprot_t pgprot_noncached(pgprot_t _prot)
334{
335 unsigned long prot = pgprot_val(_prot);
336
337 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
338
339 return __pgprot(prot);
340}
341
342/*
343 * Conversion functions: convert a page and protection to a page entry,
344 * and a page entry and page directory to the page they refer to.
345 */
346#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
347
348#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
349static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
350{
351 pte.pte_low &= _PAGE_CHG_MASK;
352 pte.pte_high &= ~0x3f;
353 pte.pte_low |= pgprot_val(newprot);
354 pte.pte_high |= pgprot_val(newprot) & 0x3f;
355 return pte;
356}
357#else
358static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
359{
360 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
361}
362#endif
363
364
365extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
366 pte_t pte);
367extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
368 pte_t pte);
369
370static inline void update_mmu_cache(struct vm_area_struct *vma,
371 unsigned long address, pte_t *ptep)
372{
373 pte_t pte = *ptep;
374 __update_tlb(vma, address, pte);
375 __update_cache(vma, address, pte);
376}
377
378#define kern_addr_valid(addr) (1)
379
380#ifdef CONFIG_64BIT_PHYS_ADDR
381extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
382
383static inline int io_remap_pfn_range(struct vm_area_struct *vma,
384 unsigned long vaddr,
385 unsigned long pfn,
386 unsigned long size,
387 pgprot_t prot)
388{
389 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
390 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
391}
392#else
393#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
394 remap_pfn_range(vma, vaddr, pfn, size, prot)
395#endif
396
397#include <asm-generic/pgtable.h>
398
399/*
400 * uncached accelerated TLB map for video memory access
401 */
402#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
403#define __HAVE_PHYS_MEM_ACCESS_PROT
404
405struct file;
406pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
407 unsigned long size, pgprot_t vma_prot);
408int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
409 unsigned long size, pgprot_t *vma_prot);
410#endif
411
412/*
413 * We provide our own get_unmapped area to cope with the virtual aliasing
414 * constraints placed on us by the cache architecture.
415 */
416#define HAVE_ARCH_UNMAPPED_AREA
417#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
418
419/*
420 * No page table caches to initialise
421 */
422#define pgtable_cache_init() do { } while (0)
423
424#endif /* _ASM_PGTABLE_H */