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); \
130 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
132 #define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
133 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
135 static inline void set_pte(pte_t *ptep, pte_t pte)
137 ptep->pte_high = pte.pte_high;
139 ptep->pte_low = pte.pte_low;
141 if (pte.pte_high & _PAGE_GLOBAL) {
142 pte_t *buddy = ptep_buddy(ptep);
144 * Make sure the buddy is global too (if it's !none,
145 * it better already be global)
147 if (pte_none(*buddy))
148 buddy->pte_high |= _PAGE_GLOBAL;
151 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
153 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
155 pte_t null = __pte(0);
158 /* Preserve global status for the pair */
159 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
160 null.pte_high = _PAGE_GLOBAL;
162 set_pte_at(mm, addr, ptep, null);
167 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
168 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
171 * Certain architectures need to do special things when pte's
172 * within a page table are directly modified. Thus, the following
173 * hook is made available.
175 static inline void set_pte(pte_t *ptep, pte_t pteval)
178 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
179 if (pte_val(pteval) & _PAGE_GLOBAL) {
180 pte_t *buddy = ptep_buddy(ptep);
182 * Make sure the buddy is global too (if it's !none,
183 * it better already be global)
187 * For SMP, multiple CPUs can race, so we need to do
190 unsigned long page_global = _PAGE_GLOBAL;
193 __asm__ __volatile__ (
196 "1: " __LL " %[tmp], %[buddy]\n"
198 " or %[tmp], %[tmp], %[global]\n"
199 " " __SC " %[tmp], %[buddy]\n"
204 : [buddy] "+m" (buddy->pte),
206 : [global] "r" (page_global));
207 #else /* !CONFIG_SMP */
208 if (pte_none(*buddy))
209 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
210 #endif /* CONFIG_SMP */
214 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
216 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
219 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
220 /* Preserve global status for the pair */
221 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
222 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
225 set_pte_at(mm, addr, ptep, __pte(0));
231 * (pmds are folded into puds so this doesn't get actually called,
232 * but the define is needed for a generic inline function.)
234 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
236 #ifndef __PAGETABLE_PMD_FOLDED
238 * (puds are folded into pgds so this doesn't get actually called,
239 * but the define is needed for a generic inline function.)
241 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
244 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
245 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
246 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
249 * We used to declare this array with size but gcc 3.3 and older are not able
250 * to find that this expression is a constant, so the size is dropped.
252 extern pgd_t swapper_pg_dir[];
255 * The following only work if pte_present() is true.
256 * Undefined behaviour if not..
258 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
259 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
260 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
261 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
263 static inline pte_t pte_wrprotect(pte_t pte)
265 pte.pte_low &= ~_PAGE_WRITE;
266 pte.pte_high &= ~_PAGE_SILENT_WRITE;
270 static inline pte_t pte_mkclean(pte_t pte)
272 pte.pte_low &= ~_PAGE_MODIFIED;
273 pte.pte_high &= ~_PAGE_SILENT_WRITE;
277 static inline pte_t pte_mkold(pte_t pte)
279 pte.pte_low &= ~_PAGE_ACCESSED;
280 pte.pte_high &= ~_PAGE_SILENT_READ;
284 static inline pte_t pte_mkwrite(pte_t pte)
286 pte.pte_low |= _PAGE_WRITE;
287 if (pte.pte_low & _PAGE_MODIFIED)
288 pte.pte_high |= _PAGE_SILENT_WRITE;
292 static inline pte_t pte_mkdirty(pte_t pte)
294 pte.pte_low |= _PAGE_MODIFIED;
295 if (pte.pte_low & _PAGE_WRITE)
296 pte.pte_high |= _PAGE_SILENT_WRITE;
300 static inline pte_t pte_mkyoung(pte_t pte)
302 pte.pte_low |= _PAGE_ACCESSED;
303 if (pte.pte_low & _PAGE_READ)
304 pte.pte_high |= _PAGE_SILENT_READ;
308 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
309 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
310 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
312 static inline pte_t pte_wrprotect(pte_t pte)
314 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
318 static inline pte_t pte_mkclean(pte_t pte)
320 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
324 static inline pte_t pte_mkold(pte_t pte)
326 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
330 static inline pte_t pte_mkwrite(pte_t pte)
332 pte_val(pte) |= _PAGE_WRITE;
333 if (pte_val(pte) & _PAGE_MODIFIED)
334 pte_val(pte) |= _PAGE_SILENT_WRITE;
338 static inline pte_t pte_mkdirty(pte_t pte)
340 pte_val(pte) |= _PAGE_MODIFIED;
341 if (pte_val(pte) & _PAGE_WRITE)
342 pte_val(pte) |= _PAGE_SILENT_WRITE;
346 static inline pte_t pte_mkyoung(pte_t pte)
348 pte_val(pte) |= _PAGE_ACCESSED;
349 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
350 if (!(pte_val(pte) & _PAGE_NO_READ))
351 pte_val(pte) |= _PAGE_SILENT_READ;
354 if (pte_val(pte) & _PAGE_READ)
355 pte_val(pte) |= _PAGE_SILENT_READ;
359 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
360 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
362 static inline pte_t pte_mkhuge(pte_t pte)
364 pte_val(pte) |= _PAGE_HUGE;
367 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
369 static inline int pte_special(pte_t pte) { return 0; }
370 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
373 * Macro to make mark a page protection value as "uncacheable". Note
374 * that "protection" is really a misnomer here as the protection value
375 * contains the memory attribute bits, dirty bits, and various other
378 #define pgprot_noncached pgprot_noncached
380 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
382 unsigned long prot = pgprot_val(_prot);
384 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
386 return __pgprot(prot);
389 #define pgprot_writecombine pgprot_writecombine
391 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
393 unsigned long prot = pgprot_val(_prot);
395 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
396 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
398 return __pgprot(prot);
402 * Conversion functions: convert a page and protection to a page entry,
403 * and a page entry and page directory to the page they refer to.
405 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
407 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
408 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
410 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
411 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
412 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
413 pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
417 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
419 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
424 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
426 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
429 static inline void update_mmu_cache(struct vm_area_struct *vma,
430 unsigned long address, pte_t *ptep)
433 __update_tlb(vma, address, pte);
434 __update_cache(vma, address, pte);
437 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
438 unsigned long address, pmd_t *pmdp)
440 pte_t pte = *(pte_t *)pmdp;
442 __update_tlb(vma, address, pte);
445 #define kern_addr_valid(addr) (1)
447 #ifdef CONFIG_PHYS_ADDR_T_64BIT
448 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
450 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
456 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
457 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
459 #define io_remap_pfn_range io_remap_pfn_range
462 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
464 extern int has_transparent_hugepage(void);
466 static inline int pmd_trans_huge(pmd_t pmd)
468 return !!(pmd_val(pmd) & _PAGE_HUGE);
471 static inline pmd_t pmd_mkhuge(pmd_t pmd)
473 pmd_val(pmd) |= _PAGE_HUGE;
478 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
479 pmd_t *pmdp, pmd_t pmd);
481 #define __HAVE_ARCH_PMD_WRITE
482 static inline int pmd_write(pmd_t pmd)
484 return !!(pmd_val(pmd) & _PAGE_WRITE);
487 static inline pmd_t pmd_wrprotect(pmd_t pmd)
489 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
493 static inline pmd_t pmd_mkwrite(pmd_t pmd)
495 pmd_val(pmd) |= _PAGE_WRITE;
496 if (pmd_val(pmd) & _PAGE_MODIFIED)
497 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
502 static inline int pmd_dirty(pmd_t pmd)
504 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
507 static inline pmd_t pmd_mkclean(pmd_t pmd)
509 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
513 static inline pmd_t pmd_mkdirty(pmd_t pmd)
515 pmd_val(pmd) |= _PAGE_MODIFIED;
516 if (pmd_val(pmd) & _PAGE_WRITE)
517 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
522 static inline int pmd_young(pmd_t pmd)
524 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
527 static inline pmd_t pmd_mkold(pmd_t pmd)
529 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
534 static inline pmd_t pmd_mkyoung(pmd_t pmd)
536 pmd_val(pmd) |= _PAGE_ACCESSED;
538 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
539 if (!(pmd_val(pmd) & _PAGE_NO_READ))
540 pmd_val(pmd) |= _PAGE_SILENT_READ;
543 if (pmd_val(pmd) & _PAGE_READ)
544 pmd_val(pmd) |= _PAGE_SILENT_READ;
549 /* Extern to avoid header file madness */
550 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
552 static inline unsigned long pmd_pfn(pmd_t pmd)
554 return pmd_val(pmd) >> _PFN_SHIFT;
557 static inline struct page *pmd_page(pmd_t pmd)
559 if (pmd_trans_huge(pmd))
560 return pfn_to_page(pmd_pfn(pmd));
562 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
565 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
567 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
571 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
573 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
579 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
580 * different prototype.
582 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
583 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
584 unsigned long address, pmd_t *pmdp)
593 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
595 #include <asm-generic/pgtable.h>
598 * uncached accelerated TLB map for video memory access
600 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
601 #define __HAVE_PHYS_MEM_ACCESS_PROT
604 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
605 unsigned long size, pgprot_t vma_prot);
606 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
607 unsigned long size, pgprot_t *vma_prot);
611 * We provide our own get_unmapped area to cope with the virtual aliasing
612 * constraints placed on us by the cache architecture.
614 #define HAVE_ARCH_UNMAPPED_AREA
615 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
618 * No page table caches to initialise
620 #define pgtable_cache_init() do { } while (0)
622 #endif /* _ASM_PGTABLE_H */