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 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
131 pte_t *ptep, pte_t pteval);
133 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
135 #define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
136 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
137 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
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_high & _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_high |= _PAGE_GLOBAL;
156 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
158 pte_t null = __pte(0);
161 /* Preserve global status for the pair */
162 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
163 null.pte_high = _PAGE_GLOBAL;
165 set_pte_at(mm, addr, ptep, null);
170 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
171 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
172 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
175 * Certain architectures need to do special things when pte's
176 * within a page table are directly modified. Thus, the following
177 * hook is made available.
179 static inline void set_pte(pte_t *ptep, pte_t pteval)
182 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
183 if (pte_val(pteval) & _PAGE_GLOBAL) {
184 pte_t *buddy = ptep_buddy(ptep);
186 * Make sure the buddy is global too (if it's !none,
187 * it better already be global)
191 * For SMP, multiple CPUs can race, so we need to do
195 #define LL_INSN "lld"
196 #define SC_INSN "scd"
197 #else /* CONFIG_32BIT */
201 unsigned long page_global = _PAGE_GLOBAL;
204 __asm__ __volatile__ (
207 "1: " LL_INSN " %[tmp], %[buddy]\n"
209 " or %[tmp], %[tmp], %[global]\n"
210 " " SC_INSN " %[tmp], %[buddy]\n"
215 : [buddy] "+m" (buddy->pte),
217 : [global] "r" (page_global));
218 #else /* !CONFIG_SMP */
219 if (pte_none(*buddy))
220 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
221 #endif /* CONFIG_SMP */
226 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
229 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
230 /* Preserve global status for the pair */
231 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
232 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
235 set_pte_at(mm, addr, ptep, __pte(0));
240 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
241 pte_t *ptep, pte_t pteval)
243 extern void __update_cache(unsigned long address, pte_t pte);
245 if (!pte_present(pteval))
246 goto cache_sync_done;
248 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
249 goto cache_sync_done;
251 __update_cache(addr, pteval);
253 set_pte(ptep, pteval);
257 * (pmds are folded into puds so this doesn't get actually called,
258 * but the define is needed for a generic inline function.)
260 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
262 #ifndef __PAGETABLE_PMD_FOLDED
264 * (puds are folded into pgds so this doesn't get actually called,
265 * but the define is needed for a generic inline function.)
267 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
270 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
271 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
272 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
275 * We used to declare this array with size but gcc 3.3 and older are not able
276 * to find that this expression is a constant, so the size is dropped.
278 extern pgd_t swapper_pg_dir[];
281 * The following only work if pte_present() is true.
282 * Undefined behaviour if not..
284 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
285 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
286 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
287 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
289 static inline pte_t pte_wrprotect(pte_t pte)
291 pte.pte_low &= ~_PAGE_WRITE;
292 pte.pte_high &= ~_PAGE_SILENT_WRITE;
296 static inline pte_t pte_mkclean(pte_t pte)
298 pte.pte_low &= ~_PAGE_MODIFIED;
299 pte.pte_high &= ~_PAGE_SILENT_WRITE;
303 static inline pte_t pte_mkold(pte_t pte)
305 pte.pte_low &= ~_PAGE_ACCESSED;
306 pte.pte_high &= ~_PAGE_SILENT_READ;
310 static inline pte_t pte_mkwrite(pte_t pte)
312 pte.pte_low |= _PAGE_WRITE;
313 if (pte.pte_low & _PAGE_MODIFIED)
314 pte.pte_high |= _PAGE_SILENT_WRITE;
318 static inline pte_t pte_mkdirty(pte_t pte)
320 pte.pte_low |= _PAGE_MODIFIED;
321 if (pte.pte_low & _PAGE_WRITE)
322 pte.pte_high |= _PAGE_SILENT_WRITE;
326 static inline pte_t pte_mkyoung(pte_t pte)
328 pte.pte_low |= _PAGE_ACCESSED;
329 if (pte.pte_low & _PAGE_READ)
330 pte.pte_high |= _PAGE_SILENT_READ;
334 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
335 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
336 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
338 static inline pte_t pte_wrprotect(pte_t pte)
340 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
344 static inline pte_t pte_mkclean(pte_t pte)
346 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
350 static inline pte_t pte_mkold(pte_t pte)
352 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
356 static inline pte_t pte_mkwrite(pte_t pte)
358 pte_val(pte) |= _PAGE_WRITE;
359 if (pte_val(pte) & _PAGE_MODIFIED)
360 pte_val(pte) |= _PAGE_SILENT_WRITE;
364 static inline pte_t pte_mkdirty(pte_t pte)
366 pte_val(pte) |= _PAGE_MODIFIED;
367 if (pte_val(pte) & _PAGE_WRITE)
368 pte_val(pte) |= _PAGE_SILENT_WRITE;
372 static inline pte_t pte_mkyoung(pte_t pte)
374 pte_val(pte) |= _PAGE_ACCESSED;
375 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
376 if (!(pte_val(pte) & _PAGE_NO_READ))
377 pte_val(pte) |= _PAGE_SILENT_READ;
380 if (pte_val(pte) & _PAGE_READ)
381 pte_val(pte) |= _PAGE_SILENT_READ;
385 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
386 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
388 static inline pte_t pte_mkhuge(pte_t pte)
390 pte_val(pte) |= _PAGE_HUGE;
393 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
395 static inline int pte_special(pte_t pte) { return 0; }
396 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
399 * Macro to make mark a page protection value as "uncacheable". Note
400 * that "protection" is really a misnomer here as the protection value
401 * contains the memory attribute bits, dirty bits, and various other
404 #define pgprot_noncached pgprot_noncached
406 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
408 unsigned long prot = pgprot_val(_prot);
410 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
412 return __pgprot(prot);
415 #define pgprot_writecombine pgprot_writecombine
417 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
419 unsigned long prot = pgprot_val(_prot);
421 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
422 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
424 return __pgprot(prot);
428 * Conversion functions: convert a page and protection to a page entry,
429 * and a page entry and page directory to the page they refer to.
431 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
433 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
434 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
436 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
437 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
438 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
439 pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
443 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
445 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
450 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
453 static inline void update_mmu_cache(struct vm_area_struct *vma,
454 unsigned long address, pte_t *ptep)
457 __update_tlb(vma, address, pte);
460 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
461 unsigned long address, pmd_t *pmdp)
463 pte_t pte = *(pte_t *)pmdp;
465 __update_tlb(vma, address, pte);
468 #define kern_addr_valid(addr) (1)
470 #ifdef CONFIG_PHYS_ADDR_T_64BIT
471 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
473 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
479 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
480 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
482 #define io_remap_pfn_range io_remap_pfn_range
485 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
487 extern int has_transparent_hugepage(void);
489 static inline int pmd_trans_huge(pmd_t pmd)
491 return !!(pmd_val(pmd) & _PAGE_HUGE);
494 static inline pmd_t pmd_mkhuge(pmd_t pmd)
496 pmd_val(pmd) |= _PAGE_HUGE;
501 static inline int pmd_trans_splitting(pmd_t pmd)
503 return !!(pmd_val(pmd) & _PAGE_SPLITTING);
506 static inline pmd_t pmd_mksplitting(pmd_t pmd)
508 pmd_val(pmd) |= _PAGE_SPLITTING;
513 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
514 pmd_t *pmdp, pmd_t pmd);
516 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
517 /* Extern to avoid header file madness */
518 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
519 unsigned long address,
522 #define __HAVE_ARCH_PMD_WRITE
523 static inline int pmd_write(pmd_t pmd)
525 return !!(pmd_val(pmd) & _PAGE_WRITE);
528 static inline pmd_t pmd_wrprotect(pmd_t pmd)
530 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
534 static inline pmd_t pmd_mkwrite(pmd_t pmd)
536 pmd_val(pmd) |= _PAGE_WRITE;
537 if (pmd_val(pmd) & _PAGE_MODIFIED)
538 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
543 static inline int pmd_dirty(pmd_t pmd)
545 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
548 static inline pmd_t pmd_mkclean(pmd_t pmd)
550 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
554 static inline pmd_t pmd_mkdirty(pmd_t pmd)
556 pmd_val(pmd) |= _PAGE_MODIFIED;
557 if (pmd_val(pmd) & _PAGE_WRITE)
558 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
563 static inline int pmd_young(pmd_t pmd)
565 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
568 static inline pmd_t pmd_mkold(pmd_t pmd)
570 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
575 static inline pmd_t pmd_mkyoung(pmd_t pmd)
577 pmd_val(pmd) |= _PAGE_ACCESSED;
579 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
580 if (!(pmd_val(pmd) & _PAGE_NO_READ))
581 pmd_val(pmd) |= _PAGE_SILENT_READ;
584 if (pmd_val(pmd) & _PAGE_READ)
585 pmd_val(pmd) |= _PAGE_SILENT_READ;
590 /* Extern to avoid header file madness */
591 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
593 static inline unsigned long pmd_pfn(pmd_t pmd)
595 return pmd_val(pmd) >> _PFN_SHIFT;
598 static inline struct page *pmd_page(pmd_t pmd)
600 if (pmd_trans_huge(pmd))
601 return pfn_to_page(pmd_pfn(pmd));
603 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
606 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
608 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
612 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
614 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
620 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
621 * different prototype.
623 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
624 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
625 unsigned long address, pmd_t *pmdp)
634 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
636 #include <asm-generic/pgtable.h>
639 * uncached accelerated TLB map for video memory access
641 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
642 #define __HAVE_PHYS_MEM_ACCESS_PROT
645 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
646 unsigned long size, pgprot_t vma_prot);
647 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
648 unsigned long size, pgprot_t *vma_prot);
652 * We provide our own get_unmapped area to cope with the virtual aliasing
653 * constraints placed on us by the cache architecture.
655 #define HAVE_ARCH_UNMAPPED_AREA
656 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
659 * No page table caches to initialise
661 #define pgtable_cache_init() do { } while (0)
663 #endif /* _ASM_PGTABLE_H */