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 | (cpu_has_rixi ? 0 : _PAGE_READ) | \
28 _page_cachable_default)
29 #define PAGE_COPY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
30 (cpu_has_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default)
31 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
32 _page_cachable_default)
33 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
34 _PAGE_GLOBAL | _page_cachable_default)
35 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
36 _page_cachable_default)
37 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
38 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
41 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
42 * execute, and consider it to be the same as read. Also, write
43 * permissions imply read permissions. This is the closest we can get
44 * by reasonable means..
48 * Dummy values to fill the table in mmap.c
49 * The real values will be generated at runtime
51 #define __P000 __pgprot(0)
52 #define __P001 __pgprot(0)
53 #define __P010 __pgprot(0)
54 #define __P011 __pgprot(0)
55 #define __P100 __pgprot(0)
56 #define __P101 __pgprot(0)
57 #define __P110 __pgprot(0)
58 #define __P111 __pgprot(0)
60 #define __S000 __pgprot(0)
61 #define __S001 __pgprot(0)
62 #define __S010 __pgprot(0)
63 #define __S011 __pgprot(0)
64 #define __S100 __pgprot(0)
65 #define __S101 __pgprot(0)
66 #define __S110 __pgprot(0)
67 #define __S111 __pgprot(0)
69 extern unsigned long _page_cachable_default;
72 * ZERO_PAGE is a global shared page that is always zero; used
73 * for zero-mapped memory areas etc..
76 extern unsigned long empty_zero_page;
77 extern unsigned long zero_page_mask;
79 #define ZERO_PAGE(vaddr) \
80 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
81 #define __HAVE_COLOR_ZERO_PAGE
83 extern void paging_init(void);
86 * Conversion functions: convert a page and protection to a page entry,
87 * and a page entry and page directory to the page they refer to.
89 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
91 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
92 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
93 #define pmd_page(pmd) __pmd_page(pmd)
94 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
96 #define pmd_page_vaddr(pmd) pmd_val(pmd)
98 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
100 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
101 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
103 static inline void set_pte(pte_t *ptep, pte_t pte)
105 ptep->pte_high = pte.pte_high;
107 ptep->pte_low = pte.pte_low;
109 if (pte.pte_low & _PAGE_GLOBAL) {
110 pte_t *buddy = ptep_buddy(ptep);
112 * Make sure the buddy is global too (if it's !none,
113 * it better already be global)
115 if (pte_none(*buddy)) {
116 buddy->pte_low |= _PAGE_GLOBAL;
117 buddy->pte_high |= _PAGE_GLOBAL;
121 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
123 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
125 pte_t null = __pte(0);
127 /* Preserve global status for the pair */
128 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
129 null.pte_low = null.pte_high = _PAGE_GLOBAL;
131 set_pte_at(mm, addr, ptep, null);
135 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
136 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
139 * Certain architectures need to do special things when pte's
140 * within a page table are directly modified. Thus, the following
141 * hook is made available.
143 static inline void set_pte(pte_t *ptep, pte_t pteval)
146 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
147 if (pte_val(pteval) & _PAGE_GLOBAL) {
148 pte_t *buddy = ptep_buddy(ptep);
150 * Make sure the buddy is global too (if it's !none,
151 * it better already be global)
153 if (pte_none(*buddy))
154 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
158 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
160 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
162 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
163 /* Preserve global status for the pair */
164 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
165 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
168 set_pte_at(mm, addr, ptep, __pte(0));
173 * (pmds are folded into puds so this doesn't get actually called,
174 * but the define is needed for a generic inline function.)
176 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
178 #ifndef __PAGETABLE_PMD_FOLDED
180 * (puds are folded into pgds so this doesn't get actually called,
181 * but the define is needed for a generic inline function.)
183 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
186 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
187 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
188 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
191 * We used to declare this array with size but gcc 3.3 and older are not able
192 * to find that this expression is a constant, so the size is dropped.
194 extern pgd_t swapper_pg_dir[];
197 * The following only work if pte_present() is true.
198 * Undefined behaviour if not..
200 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
201 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
202 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
203 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
204 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
206 static inline pte_t pte_wrprotect(pte_t pte)
208 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
209 pte.pte_high &= ~_PAGE_SILENT_WRITE;
213 static inline pte_t pte_mkclean(pte_t pte)
215 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
216 pte.pte_high &= ~_PAGE_SILENT_WRITE;
220 static inline pte_t pte_mkold(pte_t pte)
222 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
223 pte.pte_high &= ~_PAGE_SILENT_READ;
227 static inline pte_t pte_mkwrite(pte_t pte)
229 pte.pte_low |= _PAGE_WRITE;
230 if (pte.pte_low & _PAGE_MODIFIED) {
231 pte.pte_low |= _PAGE_SILENT_WRITE;
232 pte.pte_high |= _PAGE_SILENT_WRITE;
237 static inline pte_t pte_mkdirty(pte_t pte)
239 pte.pte_low |= _PAGE_MODIFIED;
240 if (pte.pte_low & _PAGE_WRITE) {
241 pte.pte_low |= _PAGE_SILENT_WRITE;
242 pte.pte_high |= _PAGE_SILENT_WRITE;
247 static inline pte_t pte_mkyoung(pte_t pte)
249 pte.pte_low |= _PAGE_ACCESSED;
250 if (pte.pte_low & _PAGE_READ) {
251 pte.pte_low |= _PAGE_SILENT_READ;
252 pte.pte_high |= _PAGE_SILENT_READ;
257 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
258 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
259 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
260 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
262 static inline pte_t pte_wrprotect(pte_t pte)
264 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
268 static inline pte_t pte_mkclean(pte_t pte)
270 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
274 static inline pte_t pte_mkold(pte_t pte)
276 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
280 static inline pte_t pte_mkwrite(pte_t pte)
282 pte_val(pte) |= _PAGE_WRITE;
283 if (pte_val(pte) & _PAGE_MODIFIED)
284 pte_val(pte) |= _PAGE_SILENT_WRITE;
288 static inline pte_t pte_mkdirty(pte_t pte)
290 pte_val(pte) |= _PAGE_MODIFIED;
291 if (pte_val(pte) & _PAGE_WRITE)
292 pte_val(pte) |= _PAGE_SILENT_WRITE;
296 static inline pte_t pte_mkyoung(pte_t pte)
298 pte_val(pte) |= _PAGE_ACCESSED;
300 if (!(pte_val(pte) & _PAGE_NO_READ))
301 pte_val(pte) |= _PAGE_SILENT_READ;
303 if (pte_val(pte) & _PAGE_READ)
304 pte_val(pte) |= _PAGE_SILENT_READ;
310 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
312 static inline pte_t pte_mkhuge(pte_t pte)
314 pte_val(pte) |= _PAGE_HUGE;
317 #endif /* _PAGE_HUGE */
319 static inline int pte_special(pte_t pte) { return 0; }
320 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
323 * Macro to make mark a page protection value as "uncacheable". Note
324 * that "protection" is really a misnomer here as the protection value
325 * contains the memory attribute bits, dirty bits, and various other
328 #define pgprot_noncached pgprot_noncached
330 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
332 unsigned long prot = pgprot_val(_prot);
334 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
336 return __pgprot(prot);
340 * Conversion functions: convert a page and protection to a page entry,
341 * and a page entry and page directory to the page they refer to.
343 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
345 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
346 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
348 pte.pte_low &= _PAGE_CHG_MASK;
349 pte.pte_high &= ~0x3f;
350 pte.pte_low |= pgprot_val(newprot);
351 pte.pte_high |= pgprot_val(newprot) & 0x3f;
355 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
357 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
362 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
364 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
367 static inline void update_mmu_cache(struct vm_area_struct *vma,
368 unsigned long address, pte_t *ptep)
371 __update_tlb(vma, address, pte);
372 __update_cache(vma, address, pte);
375 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
376 unsigned long address, pmd_t *pmdp)
378 pte_t pte = *(pte_t *)pmdp;
380 __update_tlb(vma, address, pte);
383 #define kern_addr_valid(addr) (1)
385 #ifdef CONFIG_64BIT_PHYS_ADDR
386 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
388 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
394 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
395 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
398 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
399 remap_pfn_range(vma, vaddr, pfn, size, prot)
402 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
404 extern int has_transparent_hugepage(void);
406 static inline int pmd_trans_huge(pmd_t pmd)
408 return !!(pmd_val(pmd) & _PAGE_HUGE);
411 static inline pmd_t pmd_mkhuge(pmd_t pmd)
413 pmd_val(pmd) |= _PAGE_HUGE;
418 static inline int pmd_trans_splitting(pmd_t pmd)
420 return !!(pmd_val(pmd) & _PAGE_SPLITTING);
423 static inline pmd_t pmd_mksplitting(pmd_t pmd)
425 pmd_val(pmd) |= _PAGE_SPLITTING;
430 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
431 pmd_t *pmdp, pmd_t pmd);
433 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
434 /* Extern to avoid header file madness */
435 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
436 unsigned long address,
439 #define __HAVE_ARCH_PMD_WRITE
440 static inline int pmd_write(pmd_t pmd)
442 return !!(pmd_val(pmd) & _PAGE_WRITE);
445 static inline pmd_t pmd_wrprotect(pmd_t pmd)
447 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
451 static inline pmd_t pmd_mkwrite(pmd_t pmd)
453 pmd_val(pmd) |= _PAGE_WRITE;
454 if (pmd_val(pmd) & _PAGE_MODIFIED)
455 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
460 static inline int pmd_dirty(pmd_t pmd)
462 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
465 static inline pmd_t pmd_mkclean(pmd_t pmd)
467 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
471 static inline pmd_t pmd_mkdirty(pmd_t pmd)
473 pmd_val(pmd) |= _PAGE_MODIFIED;
474 if (pmd_val(pmd) & _PAGE_WRITE)
475 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
480 static inline int pmd_young(pmd_t pmd)
482 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
485 static inline pmd_t pmd_mkold(pmd_t pmd)
487 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
492 static inline pmd_t pmd_mkyoung(pmd_t pmd)
494 pmd_val(pmd) |= _PAGE_ACCESSED;
497 if (!(pmd_val(pmd) & _PAGE_NO_READ))
498 pmd_val(pmd) |= _PAGE_SILENT_READ;
500 if (pmd_val(pmd) & _PAGE_READ)
501 pmd_val(pmd) |= _PAGE_SILENT_READ;
507 /* Extern to avoid header file madness */
508 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
510 static inline unsigned long pmd_pfn(pmd_t pmd)
512 return pmd_val(pmd) >> _PFN_SHIFT;
515 static inline struct page *pmd_page(pmd_t pmd)
517 if (pmd_trans_huge(pmd))
518 return pfn_to_page(pmd_pfn(pmd));
520 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
523 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
525 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
529 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
531 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
537 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
538 * different prototype.
540 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
541 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
542 unsigned long address, pmd_t *pmdp)
551 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
553 #include <asm-generic/pgtable.h>
556 * uncached accelerated TLB map for video memory access
558 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
559 #define __HAVE_PHYS_MEM_ACCESS_PROT
562 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
563 unsigned long size, pgprot_t vma_prot);
564 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
565 unsigned long size, pgprot_t *vma_prot);
569 * We provide our own get_unmapped area to cope with the virtual aliasing
570 * constraints placed on us by the cache architecture.
572 #define HAVE_ARCH_UNMAPPED_AREA
573 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
576 * No page table caches to initialise
578 #define pgtable_cache_init() do { } while (0)
580 #endif /* _ASM_PGTABLE_H */