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
12 #include <asm/pgtable-32.h>
15 #include <asm/pgtable-64.h>
19 #include <asm/pgtable-bits.h>
22 struct vm_area_struct;
24 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
26 PAGE_CACHABLE_DEFAULT)
27 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
28 PAGE_CACHABLE_DEFAULT)
29 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
30 PAGE_CACHABLE_DEFAULT)
31 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
32 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
33 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
34 PAGE_CACHABLE_DEFAULT)
35 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
39 * MIPS can't do page protection for execute, and considers that the same like
40 * read. Also, write permissions imply read permissions. This is the closest
41 * we can get by reasonable means..
43 #define __P000 PAGE_NONE
44 #define __P001 PAGE_READONLY
45 #define __P010 PAGE_COPY
46 #define __P011 PAGE_COPY
47 #define __P100 PAGE_READONLY
48 #define __P101 PAGE_READONLY
49 #define __P110 PAGE_COPY
50 #define __P111 PAGE_COPY
52 #define __S000 PAGE_NONE
53 #define __S001 PAGE_READONLY
54 #define __S010 PAGE_SHARED
55 #define __S011 PAGE_SHARED
56 #define __S100 PAGE_READONLY
57 #define __S101 PAGE_READONLY
58 #define __S110 PAGE_SHARED
59 #define __S111 PAGE_SHARED
62 * ZERO_PAGE is a global shared page that is always zero; used
63 * for zero-mapped memory areas etc..
66 extern unsigned long empty_zero_page;
67 extern unsigned long zero_page_mask;
69 #define ZERO_PAGE(vaddr) \
70 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
72 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
74 extern void paging_init(void);
77 * Conversion functions: convert a page and protection to a page entry,
78 * and a page entry and page directory to the page they refer to.
80 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
81 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
82 #define pmd_page_kernel(pmd) pmd_val(pmd)
84 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
85 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
87 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
88 static inline void set_pte(pte_t *ptep, pte_t pte)
90 ptep->pte_high = pte.pte_high;
92 ptep->pte_low = pte.pte_low;
93 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
95 if (pte_val(pte) & _PAGE_GLOBAL) {
96 pte_t *buddy = ptep_buddy(ptep);
98 * Make sure the buddy is global too (if it's !none,
99 * it better already be global)
101 if (pte_none(*buddy))
102 buddy->pte_low |= _PAGE_GLOBAL;
105 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
107 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
109 /* Preserve global status for the pair */
110 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
111 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
113 set_pte_at(mm, addr, ptep, __pte(0));
117 * Certain architectures need to do special things when pte's
118 * within a page table are directly modified. Thus, the following
119 * hook is made available.
121 static inline void set_pte(pte_t *ptep, pte_t pteval)
124 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
125 if (pte_val(pteval) & _PAGE_GLOBAL) {
126 pte_t *buddy = ptep_buddy(ptep);
128 * Make sure the buddy is global too (if it's !none,
129 * it better already be global)
131 if (pte_none(*buddy))
132 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
136 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
138 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
140 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
141 /* Preserve global status for the pair */
142 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
143 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
146 set_pte_at(mm, addr, ptep, __pte(0));
151 * (pmds are folded into puds so this doesn't get actually called,
152 * but the define is needed for a generic inline function.)
154 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
158 * (puds are folded into pgds so this doesn't get actually called,
159 * but the define is needed for a generic inline function.)
161 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
164 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
165 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
166 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
168 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
171 * The following only work if pte_present() is true.
172 * Undefined behaviour if not..
174 static inline int pte_user(pte_t pte) { BUG(); return 0; }
175 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
176 static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
177 static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
178 static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
179 static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
180 static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
181 static inline pte_t pte_wrprotect(pte_t pte)
183 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
184 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
188 static inline pte_t pte_rdprotect(pte_t pte)
190 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
191 (pte).pte_high &= ~_PAGE_SILENT_READ;
195 static inline pte_t pte_mkclean(pte_t pte)
197 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
198 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
202 static inline pte_t pte_mkold(pte_t pte)
204 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
205 (pte).pte_high &= ~_PAGE_SILENT_READ;
209 static inline pte_t pte_mkwrite(pte_t pte)
211 (pte).pte_low |= _PAGE_WRITE;
212 if ((pte).pte_low & _PAGE_MODIFIED) {
213 (pte).pte_low |= _PAGE_SILENT_WRITE;
214 (pte).pte_high |= _PAGE_SILENT_WRITE;
219 static inline pte_t pte_mkread(pte_t pte)
221 (pte).pte_low |= _PAGE_READ;
222 if ((pte).pte_low & _PAGE_ACCESSED) {
223 (pte).pte_low |= _PAGE_SILENT_READ;
224 (pte).pte_high |= _PAGE_SILENT_READ;
229 static inline pte_t pte_mkdirty(pte_t pte)
231 (pte).pte_low |= _PAGE_MODIFIED;
232 if ((pte).pte_low & _PAGE_WRITE) {
233 (pte).pte_low |= _PAGE_SILENT_WRITE;
234 (pte).pte_high |= _PAGE_SILENT_WRITE;
239 static inline pte_t pte_mkyoung(pte_t pte)
241 (pte).pte_low |= _PAGE_ACCESSED;
242 if ((pte).pte_low & _PAGE_READ)
243 (pte).pte_low |= _PAGE_SILENT_READ;
244 (pte).pte_high |= _PAGE_SILENT_READ;
248 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
249 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
250 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
251 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
252 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
254 static inline pte_t pte_wrprotect(pte_t pte)
256 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
260 static inline pte_t pte_rdprotect(pte_t pte)
262 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
266 static inline pte_t pte_mkclean(pte_t pte)
268 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
272 static inline pte_t pte_mkold(pte_t pte)
274 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
278 static inline pte_t pte_mkwrite(pte_t pte)
280 pte_val(pte) |= _PAGE_WRITE;
281 if (pte_val(pte) & _PAGE_MODIFIED)
282 pte_val(pte) |= _PAGE_SILENT_WRITE;
286 static inline pte_t pte_mkread(pte_t pte)
288 pte_val(pte) |= _PAGE_READ;
289 if (pte_val(pte) & _PAGE_ACCESSED)
290 pte_val(pte) |= _PAGE_SILENT_READ;
294 static inline pte_t pte_mkdirty(pte_t pte)
296 pte_val(pte) |= _PAGE_MODIFIED;
297 if (pte_val(pte) & _PAGE_WRITE)
298 pte_val(pte) |= _PAGE_SILENT_WRITE;
302 static inline pte_t pte_mkyoung(pte_t pte)
304 pte_val(pte) |= _PAGE_ACCESSED;
305 if (pte_val(pte) & _PAGE_READ)
306 pte_val(pte) |= _PAGE_SILENT_READ;
312 * Macro to make mark a page protection value as "uncacheable". Note
313 * that "protection" is really a misnomer here as the protection value
314 * contains the memory attribute bits, dirty bits, and various other
317 #define pgprot_noncached pgprot_noncached
319 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
321 unsigned long prot = pgprot_val(_prot);
323 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
325 return __pgprot(prot);
329 * Conversion functions: convert a page and protection to a page entry,
330 * and a page entry and page directory to the page they refer to.
332 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
334 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
335 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
337 pte.pte_low &= _PAGE_CHG_MASK;
338 pte.pte_low |= pgprot_val(newprot);
339 pte.pte_high |= pgprot_val(newprot) & 0x3f;
343 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
345 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
350 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
352 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
355 static inline void update_mmu_cache(struct vm_area_struct *vma,
356 unsigned long address, pte_t pte)
358 __update_tlb(vma, address, pte);
359 __update_cache(vma, address, pte);
362 #ifndef CONFIG_NEED_MULTIPLE_NODES
363 #define kern_addr_valid(addr) (1)
366 #ifdef CONFIG_64BIT_PHYS_ADDR
367 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
369 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
375 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
376 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
379 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
380 remap_pfn_range(vma, vaddr, pfn, size, prot)
383 #define MK_IOSPACE_PFN(space, pfn) (pfn)
384 #define GET_IOSPACE(pfn) 0
385 #define GET_PFN(pfn) (pfn)
387 #include <asm-generic/pgtable.h>
390 * We provide our own get_unmapped area to cope with the virtual aliasing
391 * constraints placed on us by the cache architecture.
393 #define HAVE_ARCH_UNMAPPED_AREA
396 * No page table caches to initialise
398 #define pgtable_cache_init() do { } while (0)
400 #endif /* _ASM_PGTABLE_H */