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 | _PAGE_NO_READ | \
27 _CACHE_CACHABLE_NONCOHERENT)
28 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
29 _page_cachable_default)
30 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
31 _page_cachable_default)
32 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | \
33 _page_cachable_default)
34 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
35 _PAGE_GLOBAL | _page_cachable_default)
36 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
37 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
38 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
39 _page_cachable_default)
40 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
41 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
44 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
45 * execute, and consider it to be the same as read. Also, write
46 * permissions imply read permissions. This is the closest we can get
47 * by reasonable means..
51 * Dummy values to fill the table in mmap.c
52 * The real values will be generated at runtime
54 #define __P000 __pgprot(0)
55 #define __P001 __pgprot(0)
56 #define __P010 __pgprot(0)
57 #define __P011 __pgprot(0)
58 #define __P100 __pgprot(0)
59 #define __P101 __pgprot(0)
60 #define __P110 __pgprot(0)
61 #define __P111 __pgprot(0)
63 #define __S000 __pgprot(0)
64 #define __S001 __pgprot(0)
65 #define __S010 __pgprot(0)
66 #define __S011 __pgprot(0)
67 #define __S100 __pgprot(0)
68 #define __S101 __pgprot(0)
69 #define __S110 __pgprot(0)
70 #define __S111 __pgprot(0)
72 extern unsigned long _page_cachable_default;
75 * ZERO_PAGE is a global shared page that is always zero; used
76 * for zero-mapped memory areas etc..
79 extern unsigned long empty_zero_page;
80 extern unsigned long zero_page_mask;
82 #define ZERO_PAGE(vaddr) \
83 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
84 #define __HAVE_COLOR_ZERO_PAGE
86 extern void paging_init(void);
89 * Conversion functions: convert a page and protection to a page entry,
90 * and a page entry and page directory to the page they refer to.
92 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
94 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
95 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
96 #define pmd_page(pmd) __pmd_page(pmd)
97 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
99 #define pmd_page_vaddr(pmd) pmd_val(pmd)
103 unsigned long flags; \
106 local_irq_save(flags); \
107 if(!raw_current_cpu_data.htw_seq++) { \
108 write_c0_pwctl(read_c0_pwctl() & \
109 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
110 back_to_back_c0_hazard(); \
112 local_irq_restore(flags); \
116 #define htw_start() \
118 unsigned long flags; \
121 local_irq_save(flags); \
122 if (!--raw_current_cpu_data.htw_seq) { \
123 write_c0_pwctl(read_c0_pwctl() | \
124 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
125 back_to_back_c0_hazard(); \
127 local_irq_restore(flags); \
131 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
132 pte_t *ptep, pte_t pteval);
134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
136 #define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
137 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
138 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
140 static inline void set_pte(pte_t *ptep, pte_t pte)
142 ptep->pte_high = pte.pte_high;
144 ptep->pte_low = pte.pte_low;
146 if (pte.pte_high & _PAGE_GLOBAL) {
147 pte_t *buddy = ptep_buddy(ptep);
149 * Make sure the buddy is global too (if it's !none,
150 * it better already be global)
152 if (pte_none(*buddy))
153 buddy->pte_high |= _PAGE_GLOBAL;
157 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
159 pte_t null = __pte(0);
162 /* Preserve global status for the pair */
163 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
164 null.pte_high = _PAGE_GLOBAL;
166 set_pte_at(mm, addr, ptep, null);
171 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
172 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
173 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
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)
192 * For SMP, multiple CPUs can race, so we need to do
195 unsigned long page_global = _PAGE_GLOBAL;
198 if (kernel_uses_llsc && R10000_LLSC_WAR) {
199 __asm__ __volatile__ (
200 " .set arch=r4000 \n"
203 "1:" __LL "%[tmp], %[buddy] \n"
204 " bnez %[tmp], 2f \n"
205 " or %[tmp], %[tmp], %[global] \n"
206 __SC "%[tmp], %[buddy] \n"
207 " beqzl %[tmp], 1b \n"
212 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
213 : [global] "r" (page_global));
214 } else if (kernel_uses_llsc) {
215 __asm__ __volatile__ (
216 " .set "MIPS_ISA_ARCH_LEVEL" \n"
219 "1:" __LL "%[tmp], %[buddy] \n"
220 " bnez %[tmp], 2f \n"
221 " or %[tmp], %[tmp], %[global] \n"
222 __SC "%[tmp], %[buddy] \n"
223 " beqz %[tmp], 1b \n"
228 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
229 : [global] "r" (page_global));
231 #else /* !CONFIG_SMP */
232 if (pte_none(*buddy))
233 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
234 #endif /* CONFIG_SMP */
239 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
242 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
243 /* Preserve global status for the pair */
244 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
245 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
248 set_pte_at(mm, addr, ptep, __pte(0));
253 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
254 pte_t *ptep, pte_t pteval)
256 extern void __update_cache(unsigned long address, pte_t pte);
258 if (!pte_present(pteval))
259 goto cache_sync_done;
261 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
262 goto cache_sync_done;
264 __update_cache(addr, pteval);
266 set_pte(ptep, pteval);
270 * (pmds are folded into puds so this doesn't get actually called,
271 * but the define is needed for a generic inline function.)
273 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
275 #ifndef __PAGETABLE_PMD_FOLDED
277 * (puds are folded into pgds so this doesn't get actually called,
278 * but the define is needed for a generic inline function.)
280 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
283 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
284 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
285 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
288 * We used to declare this array with size but gcc 3.3 and older are not able
289 * to find that this expression is a constant, so the size is dropped.
291 extern pgd_t swapper_pg_dir[];
294 * The following only work if pte_present() is true.
295 * Undefined behaviour if not..
297 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
298 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
299 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
300 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
302 static inline pte_t pte_wrprotect(pte_t pte)
304 pte.pte_low &= ~_PAGE_WRITE;
305 pte.pte_high &= ~_PAGE_SILENT_WRITE;
309 static inline pte_t pte_mkclean(pte_t pte)
311 pte.pte_low &= ~_PAGE_MODIFIED;
312 pte.pte_high &= ~_PAGE_SILENT_WRITE;
316 static inline pte_t pte_mkold(pte_t pte)
318 pte.pte_low &= ~_PAGE_ACCESSED;
319 pte.pte_high &= ~_PAGE_SILENT_READ;
323 static inline pte_t pte_mkwrite(pte_t pte)
325 pte.pte_low |= _PAGE_WRITE;
326 if (pte.pte_low & _PAGE_MODIFIED)
327 pte.pte_high |= _PAGE_SILENT_WRITE;
331 static inline pte_t pte_mkdirty(pte_t pte)
333 pte.pte_low |= _PAGE_MODIFIED;
334 if (pte.pte_low & _PAGE_WRITE)
335 pte.pte_high |= _PAGE_SILENT_WRITE;
339 static inline pte_t pte_mkyoung(pte_t pte)
341 pte.pte_low |= _PAGE_ACCESSED;
342 if (!(pte.pte_low & _PAGE_NO_READ))
343 pte.pte_high |= _PAGE_SILENT_READ;
347 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
348 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
349 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
351 static inline pte_t pte_wrprotect(pte_t pte)
353 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
357 static inline pte_t pte_mkclean(pte_t pte)
359 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
363 static inline pte_t pte_mkold(pte_t pte)
365 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
369 static inline pte_t pte_mkwrite(pte_t pte)
371 pte_val(pte) |= _PAGE_WRITE;
372 if (pte_val(pte) & _PAGE_MODIFIED)
373 pte_val(pte) |= _PAGE_SILENT_WRITE;
377 static inline pte_t pte_mkdirty(pte_t pte)
379 pte_val(pte) |= _PAGE_MODIFIED;
380 if (pte_val(pte) & _PAGE_WRITE)
381 pte_val(pte) |= _PAGE_SILENT_WRITE;
385 static inline pte_t pte_mkyoung(pte_t pte)
387 pte_val(pte) |= _PAGE_ACCESSED;
388 if (!(pte_val(pte) & _PAGE_NO_READ))
389 pte_val(pte) |= _PAGE_SILENT_READ;
393 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
394 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
396 static inline pte_t pte_mkhuge(pte_t pte)
398 pte_val(pte) |= _PAGE_HUGE;
401 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
403 static inline int pte_special(pte_t pte) { return 0; }
404 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
407 * Macro to make mark a page protection value as "uncacheable". Note
408 * that "protection" is really a misnomer here as the protection value
409 * contains the memory attribute bits, dirty bits, and various other
412 #define pgprot_noncached pgprot_noncached
414 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
416 unsigned long prot = pgprot_val(_prot);
418 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
420 return __pgprot(prot);
423 #define pgprot_writecombine pgprot_writecombine
425 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
427 unsigned long prot = pgprot_val(_prot);
429 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
430 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
432 return __pgprot(prot);
436 * Conversion functions: convert a page and protection to a page entry,
437 * and a page entry and page directory to the page they refer to.
439 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
441 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
442 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
444 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
445 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
446 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
447 pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
451 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
453 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
458 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
461 static inline void update_mmu_cache(struct vm_area_struct *vma,
462 unsigned long address, pte_t *ptep)
465 __update_tlb(vma, address, pte);
468 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
469 unsigned long address, pmd_t *pmdp)
471 pte_t pte = *(pte_t *)pmdp;
473 __update_tlb(vma, address, pte);
476 #define kern_addr_valid(addr) (1)
478 #ifdef CONFIG_PHYS_ADDR_T_64BIT
479 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
481 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
487 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
488 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
490 #define io_remap_pfn_range io_remap_pfn_range
493 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
495 extern int has_transparent_hugepage(void);
497 static inline int pmd_trans_huge(pmd_t pmd)
499 return !!(pmd_val(pmd) & _PAGE_HUGE);
502 static inline pmd_t pmd_mkhuge(pmd_t pmd)
504 pmd_val(pmd) |= _PAGE_HUGE;
509 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
510 pmd_t *pmdp, pmd_t pmd);
512 #define __HAVE_ARCH_PMD_WRITE
513 static inline int pmd_write(pmd_t pmd)
515 return !!(pmd_val(pmd) & _PAGE_WRITE);
518 static inline pmd_t pmd_wrprotect(pmd_t pmd)
520 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
524 static inline pmd_t pmd_mkwrite(pmd_t pmd)
526 pmd_val(pmd) |= _PAGE_WRITE;
527 if (pmd_val(pmd) & _PAGE_MODIFIED)
528 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
533 static inline int pmd_dirty(pmd_t pmd)
535 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
538 static inline pmd_t pmd_mkclean(pmd_t pmd)
540 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
544 static inline pmd_t pmd_mkdirty(pmd_t pmd)
546 pmd_val(pmd) |= _PAGE_MODIFIED;
547 if (pmd_val(pmd) & _PAGE_WRITE)
548 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
553 static inline int pmd_young(pmd_t pmd)
555 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
558 static inline pmd_t pmd_mkold(pmd_t pmd)
560 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
565 static inline pmd_t pmd_mkyoung(pmd_t pmd)
567 pmd_val(pmd) |= _PAGE_ACCESSED;
569 if (!(pmd_val(pmd) & _PAGE_NO_READ))
570 pmd_val(pmd) |= _PAGE_SILENT_READ;
575 /* Extern to avoid header file madness */
576 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
578 static inline unsigned long pmd_pfn(pmd_t pmd)
580 return pmd_val(pmd) >> _PFN_SHIFT;
583 static inline struct page *pmd_page(pmd_t pmd)
585 if (pmd_trans_huge(pmd))
586 return pfn_to_page(pmd_pfn(pmd));
588 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
591 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
593 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
597 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
599 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
605 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
606 * different prototype.
608 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
609 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
610 unsigned long address, pmd_t *pmdp)
619 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
621 #include <asm-generic/pgtable.h>
624 * uncached accelerated TLB map for video memory access
626 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
627 #define __HAVE_PHYS_MEM_ACCESS_PROT
630 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
631 unsigned long size, pgprot_t vma_prot);
632 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
633 unsigned long size, pgprot_t *vma_prot);
637 * We provide our own get_unmapped area to cope with the virtual aliasing
638 * constraints placed on us by the cache architecture.
640 #define HAVE_ARCH_UNMAPPED_AREA
641 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
644 * No page table caches to initialise
646 #define pgtable_cache_init() do { } while (0)
648 #endif /* _ASM_PGTABLE_H */