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
6 * Copyright (C) 2003 Ralf Baechle
11 #include <linux/mm_types.h>
12 #include <linux/mmzone.h>
14 #include <asm/pgtable-32.h>
17 #include <asm/pgtable-64.h>
21 #include <asm/pgtable-bits.h>
24 struct vm_area_struct;
26 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
27 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | \
28 _page_cachable_default)
29 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
30 _page_cachable_default)
31 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
32 _page_cachable_default)
33 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
34 _PAGE_GLOBAL | _page_cachable_default)
35 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
36 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
37 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
38 _page_cachable_default)
39 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
40 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
43 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
44 * execute, and consider it to be the same as read. Also, write
45 * permissions imply read permissions. This is the closest we can get
46 * by reasonable means..
50 * Dummy values to fill the table in mmap.c
51 * The real values will be generated at runtime
53 #define __P000 __pgprot(0)
54 #define __P001 __pgprot(0)
55 #define __P010 __pgprot(0)
56 #define __P011 __pgprot(0)
57 #define __P100 __pgprot(0)
58 #define __P101 __pgprot(0)
59 #define __P110 __pgprot(0)
60 #define __P111 __pgprot(0)
62 #define __S000 __pgprot(0)
63 #define __S001 __pgprot(0)
64 #define __S010 __pgprot(0)
65 #define __S011 __pgprot(0)
66 #define __S100 __pgprot(0)
67 #define __S101 __pgprot(0)
68 #define __S110 __pgprot(0)
69 #define __S111 __pgprot(0)
71 extern unsigned long _page_cachable_default;
74 * ZERO_PAGE is a global shared page that is always zero; used
75 * for zero-mapped memory areas etc..
78 extern unsigned long empty_zero_page;
79 extern unsigned long zero_page_mask;
81 #define ZERO_PAGE(vaddr) \
82 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
83 #define __HAVE_COLOR_ZERO_PAGE
85 extern void paging_init(void);
88 * Conversion functions: convert a page and protection to a page entry,
89 * and a page entry and page directory to the page they refer to.
91 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
93 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
94 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
95 #define pmd_page(pmd) __pmd_page(pmd)
96 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
98 #define pmd_page_vaddr(pmd) pmd_val(pmd)
102 unsigned long flags; \
105 local_irq_save(flags); \
106 if(!raw_current_cpu_data.htw_seq++) { \
107 write_c0_pwctl(read_c0_pwctl() & \
108 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
109 back_to_back_c0_hazard(); \
111 local_irq_restore(flags); \
115 #define htw_start() \
117 unsigned long flags; \
120 local_irq_save(flags); \
121 if (!--raw_current_cpu_data.htw_seq) { \
122 write_c0_pwctl(read_c0_pwctl() | \
123 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
124 back_to_back_c0_hazard(); \
126 local_irq_restore(flags); \
131 extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
136 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
137 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
139 static inline void set_pte(pte_t *ptep, pte_t pte)
141 ptep->pte_high = pte.pte_high;
143 ptep->pte_low = pte.pte_low;
145 if (pte.pte_low & _PAGE_GLOBAL) {
146 pte_t *buddy = ptep_buddy(ptep);
148 * Make sure the buddy is global too (if it's !none,
149 * it better already be global)
151 if (pte_none(*buddy)) {
152 buddy->pte_low |= _PAGE_GLOBAL;
153 buddy->pte_high |= _PAGE_GLOBAL;
158 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
160 pte_t null = __pte(0);
163 /* Preserve global status for the pair */
164 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
165 null.pte_low = null.pte_high = _PAGE_GLOBAL;
167 set_pte_at(mm, addr, ptep, null);
172 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
173 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
176 * Certain architectures need to do special things when pte's
177 * within a page table are directly modified. Thus, the following
178 * hook is made available.
180 static inline void set_pte(pte_t *ptep, pte_t pteval)
183 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
184 if (pte_val(pteval) & _PAGE_GLOBAL) {
185 pte_t *buddy = ptep_buddy(ptep);
187 * Make sure the buddy is global too (if it's !none,
188 * it better already be global)
190 if (pte_none(*buddy))
191 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
196 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
199 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
200 /* Preserve global status for the pair */
201 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
202 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
205 set_pte_at(mm, addr, ptep, __pte(0));
211 * (pmds are folded into puds so this doesn't get actually called,
212 * but the define is needed for a generic inline function.)
214 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
216 #ifndef __PAGETABLE_PMD_FOLDED
218 * (puds are folded into pgds so this doesn't get actually called,
219 * but the define is needed for a generic inline function.)
221 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
224 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
225 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
226 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
229 * We used to declare this array with size but gcc 3.3 and older are not able
230 * to find that this expression is a constant, so the size is dropped.
232 extern pgd_t swapper_pg_dir[];
235 * The following only work if pte_present() is true.
236 * Undefined behaviour if not..
238 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
239 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
240 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
241 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
243 static inline pte_t pte_wrprotect(pte_t pte)
245 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
246 pte.pte_high &= ~_PAGE_SILENT_WRITE;
250 static inline pte_t pte_mkclean(pte_t pte)
252 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
253 pte.pte_high &= ~_PAGE_SILENT_WRITE;
257 static inline pte_t pte_mkold(pte_t pte)
259 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
260 pte.pte_high &= ~_PAGE_SILENT_READ;
264 static inline pte_t pte_mkwrite(pte_t pte)
266 pte.pte_low |= _PAGE_WRITE;
267 if (pte.pte_low & _PAGE_MODIFIED) {
268 pte.pte_low |= _PAGE_SILENT_WRITE;
269 pte.pte_high |= _PAGE_SILENT_WRITE;
274 static inline pte_t pte_mkdirty(pte_t pte)
276 pte.pte_low |= _PAGE_MODIFIED;
277 if (pte.pte_low & _PAGE_WRITE) {
278 pte.pte_low |= _PAGE_SILENT_WRITE;
279 pte.pte_high |= _PAGE_SILENT_WRITE;
284 static inline pte_t pte_mkyoung(pte_t pte)
286 pte.pte_low |= _PAGE_ACCESSED;
287 if (pte.pte_low & _PAGE_READ) {
288 pte.pte_low |= _PAGE_SILENT_READ;
289 pte.pte_high |= _PAGE_SILENT_READ;
294 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
295 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
296 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
298 static inline pte_t pte_wrprotect(pte_t pte)
300 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
304 static inline pte_t pte_mkclean(pte_t pte)
306 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
310 static inline pte_t pte_mkold(pte_t pte)
312 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
316 static inline pte_t pte_mkwrite(pte_t pte)
318 pte_val(pte) |= _PAGE_WRITE;
319 if (pte_val(pte) & _PAGE_MODIFIED)
320 pte_val(pte) |= _PAGE_SILENT_WRITE;
324 static inline pte_t pte_mkdirty(pte_t pte)
326 pte_val(pte) |= _PAGE_MODIFIED;
327 if (pte_val(pte) & _PAGE_WRITE)
328 pte_val(pte) |= _PAGE_SILENT_WRITE;
332 static inline pte_t pte_mkyoung(pte_t pte)
334 pte_val(pte) |= _PAGE_ACCESSED;
335 #ifdef CONFIG_CPU_MIPSR2
336 if (!(pte_val(pte) & _PAGE_NO_READ))
337 pte_val(pte) |= _PAGE_SILENT_READ;
340 if (pte_val(pte) & _PAGE_READ)
341 pte_val(pte) |= _PAGE_SILENT_READ;
345 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
346 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
348 static inline pte_t pte_mkhuge(pte_t pte)
350 pte_val(pte) |= _PAGE_HUGE;
353 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
355 static inline int pte_special(pte_t pte) { return 0; }
356 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
359 * Macro to make mark a page protection value as "uncacheable". Note
360 * that "protection" is really a misnomer here as the protection value
361 * contains the memory attribute bits, dirty bits, and various other
364 #define pgprot_noncached pgprot_noncached
366 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
368 unsigned long prot = pgprot_val(_prot);
370 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
372 return __pgprot(prot);
375 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
377 unsigned long prot = pgprot_val(_prot);
379 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
380 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
382 return __pgprot(prot);
386 * Conversion functions: convert a page and protection to a page entry,
387 * and a page entry and page directory to the page they refer to.
389 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
391 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
392 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
394 pte.pte_low &= _PAGE_CHG_MASK;
395 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
396 pte.pte_low |= pgprot_val(newprot);
397 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
401 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
403 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
408 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
411 static inline void update_mmu_cache(struct vm_area_struct *vma,
412 unsigned long address, pte_t *ptep)
415 __update_tlb(vma, address, pte);
418 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
419 unsigned long address, pmd_t *pmdp)
421 pte_t pte = *(pte_t *)pmdp;
423 __update_tlb(vma, address, pte);
426 #define kern_addr_valid(addr) (1)
428 #ifdef CONFIG_PHYS_ADDR_T_64BIT
429 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
431 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
437 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
438 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
440 #define io_remap_pfn_range io_remap_pfn_range
443 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
445 extern int has_transparent_hugepage(void);
447 static inline int pmd_trans_huge(pmd_t pmd)
449 return !!(pmd_val(pmd) & _PAGE_HUGE);
452 static inline pmd_t pmd_mkhuge(pmd_t pmd)
454 pmd_val(pmd) |= _PAGE_HUGE;
459 static inline int pmd_trans_splitting(pmd_t pmd)
461 return !!(pmd_val(pmd) & _PAGE_SPLITTING);
464 static inline pmd_t pmd_mksplitting(pmd_t pmd)
466 pmd_val(pmd) |= _PAGE_SPLITTING;
471 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
472 pmd_t *pmdp, pmd_t pmd);
474 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
475 /* Extern to avoid header file madness */
476 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
477 unsigned long address,
480 #define __HAVE_ARCH_PMD_WRITE
481 static inline int pmd_write(pmd_t pmd)
483 return !!(pmd_val(pmd) & _PAGE_WRITE);
486 static inline pmd_t pmd_wrprotect(pmd_t pmd)
488 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
492 static inline pmd_t pmd_mkwrite(pmd_t pmd)
494 pmd_val(pmd) |= _PAGE_WRITE;
495 if (pmd_val(pmd) & _PAGE_MODIFIED)
496 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
501 static inline int pmd_dirty(pmd_t pmd)
503 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
506 static inline pmd_t pmd_mkclean(pmd_t pmd)
508 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
512 static inline pmd_t pmd_mkdirty(pmd_t pmd)
514 pmd_val(pmd) |= _PAGE_MODIFIED;
515 if (pmd_val(pmd) & _PAGE_WRITE)
516 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
521 static inline int pmd_young(pmd_t pmd)
523 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
526 static inline pmd_t pmd_mkold(pmd_t pmd)
528 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
533 static inline pmd_t pmd_mkyoung(pmd_t pmd)
535 pmd_val(pmd) |= _PAGE_ACCESSED;
537 #ifdef CONFIG_CPU_MIPSR2
538 if (!(pmd_val(pmd) & _PAGE_NO_READ))
539 pmd_val(pmd) |= _PAGE_SILENT_READ;
542 if (pmd_val(pmd) & _PAGE_READ)
543 pmd_val(pmd) |= _PAGE_SILENT_READ;
548 /* Extern to avoid header file madness */
549 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
551 static inline unsigned long pmd_pfn(pmd_t pmd)
553 return pmd_val(pmd) >> _PFN_SHIFT;
556 static inline struct page *pmd_page(pmd_t pmd)
558 if (pmd_trans_huge(pmd))
559 return pfn_to_page(pmd_pfn(pmd));
561 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
564 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
566 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
570 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
572 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
578 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
579 * different prototype.
581 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
582 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
583 unsigned long address, pmd_t *pmdp)
592 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
594 #include <asm-generic/pgtable.h>
597 * uncached accelerated TLB map for video memory access
599 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
600 #define __HAVE_PHYS_MEM_ACCESS_PROT
603 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
604 unsigned long size, pgprot_t vma_prot);
605 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
606 unsigned long size, pgprot_t *vma_prot);
610 * We provide our own get_unmapped area to cope with the virtual aliasing
611 * constraints placed on us by the cache architecture.
613 #define HAVE_ARCH_UNMAPPED_AREA
614 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
617 * No page table caches to initialise
619 #define pgtable_cache_init() do { } while (0)
621 #endif /* _ASM_PGTABLE_H */