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/config.h>
13 #include <asm/pgtable-32.h>
16 #include <asm/pgtable-64.h>
20 #include <asm/pgtable-bits.h>
23 struct vm_area_struct;
25 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
26 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
27 PAGE_CACHABLE_DEFAULT)
28 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
31 PAGE_CACHABLE_DEFAULT)
32 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
34 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
35 PAGE_CACHABLE_DEFAULT)
36 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
37 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
40 * MIPS can't do page protection for execute, and considers that the same like
41 * read. Also, write permissions imply read permissions. This is the closest
42 * we can get by reasonable means..
44 #define __P000 PAGE_NONE
45 #define __P001 PAGE_READONLY
46 #define __P010 PAGE_COPY
47 #define __P011 PAGE_COPY
48 #define __P100 PAGE_READONLY
49 #define __P101 PAGE_READONLY
50 #define __P110 PAGE_COPY
51 #define __P111 PAGE_COPY
53 #define __S000 PAGE_NONE
54 #define __S001 PAGE_READONLY
55 #define __S010 PAGE_SHARED
56 #define __S011 PAGE_SHARED
57 #define __S100 PAGE_READONLY
58 #define __S101 PAGE_READONLY
59 #define __S110 PAGE_SHARED
60 #define __S111 PAGE_SHARED
63 * ZERO_PAGE is a global shared page that is always zero; used
64 * for zero-mapped memory areas etc..
67 extern unsigned long empty_zero_page;
68 extern unsigned long zero_page_mask;
70 #define ZERO_PAGE(vaddr) \
71 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
73 #define __HAVE_ARCH_MOVE_PTE
74 #define move_pte(pte, prot, old_addr, new_addr) \
76 pte_t newpte = (pte); \
77 if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
78 pte_page(pte) == ZERO_PAGE(old_addr)) \
79 newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
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) (pmd_val(pmd) - PAGE_OFFSET)
90 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
91 #define pmd_page_kernel(pmd) pmd_val(pmd)
93 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
95 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
96 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
98 static inline void set_pte(pte_t *ptep, pte_t pte)
100 ptep->pte_high = pte.pte_high;
102 ptep->pte_low = pte.pte_low;
103 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
105 if (pte.pte_low & _PAGE_GLOBAL) {
106 pte_t *buddy = ptep_buddy(ptep);
108 * Make sure the buddy is global too (if it's !none,
109 * it better already be global)
111 if (pte_none(*buddy)) {
112 buddy->pte_low |= _PAGE_GLOBAL;
113 buddy->pte_high |= _PAGE_GLOBAL;
117 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
119 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
121 pte_t null = __pte(0);
123 /* Preserve global status for the pair */
124 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
125 null.pte_low = null.pte_high = _PAGE_GLOBAL;
127 set_pte_at(mm, addr, ptep, null);
131 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
132 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
135 * Certain architectures need to do special things when pte's
136 * within a page table are directly modified. Thus, the following
137 * hook is made available.
139 static inline void set_pte(pte_t *ptep, pte_t pteval)
142 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
143 if (pte_val(pteval) & _PAGE_GLOBAL) {
144 pte_t *buddy = ptep_buddy(ptep);
146 * Make sure the buddy is global too (if it's !none,
147 * it better already be global)
149 if (pte_none(*buddy))
150 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
154 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
156 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
158 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
159 /* Preserve global status for the pair */
160 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
161 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
164 set_pte_at(mm, addr, ptep, __pte(0));
169 * (pmds are folded into puds so this doesn't get actually called,
170 * but the define is needed for a generic inline function.)
172 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
176 * (puds are folded into pgds so this doesn't get actually called,
177 * but the define is needed for a generic inline function.)
179 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
182 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
183 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
184 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
186 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
192 static inline int pte_user(pte_t pte) { BUG(); return 0; }
193 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
194 static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; }
195 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
196 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
197 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
198 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
200 static inline pte_t pte_wrprotect(pte_t pte)
202 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
203 pte.pte_high &= ~_PAGE_SILENT_WRITE;
207 static inline pte_t pte_rdprotect(pte_t pte)
209 pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
210 pte.pte_high &= ~_PAGE_SILENT_READ;
214 static inline pte_t pte_mkclean(pte_t pte)
216 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
217 pte.pte_high &= ~_PAGE_SILENT_WRITE;
221 static inline pte_t pte_mkold(pte_t pte)
223 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
224 pte.pte_high &= ~_PAGE_SILENT_READ;
228 static inline pte_t pte_mkwrite(pte_t pte)
230 pte.pte_low |= _PAGE_WRITE;
231 if (pte.pte_low & _PAGE_MODIFIED) {
232 pte.pte_low |= _PAGE_SILENT_WRITE;
233 pte.pte_high |= _PAGE_SILENT_WRITE;
238 static inline pte_t pte_mkread(pte_t pte)
240 pte.pte_low |= _PAGE_READ;
241 if (pte.pte_low & _PAGE_ACCESSED) {
242 pte.pte_low |= _PAGE_SILENT_READ;
243 pte.pte_high |= _PAGE_SILENT_READ;
248 static inline pte_t pte_mkdirty(pte_t pte)
250 pte.pte_low |= _PAGE_MODIFIED;
251 if (pte.pte_low & _PAGE_WRITE) {
252 pte.pte_low |= _PAGE_SILENT_WRITE;
253 pte.pte_high |= _PAGE_SILENT_WRITE;
258 static inline pte_t pte_mkyoung(pte_t pte)
260 pte.pte_low |= _PAGE_ACCESSED;
261 if (pte.pte_low & _PAGE_READ)
262 pte.pte_low |= _PAGE_SILENT_READ;
263 pte.pte_high |= _PAGE_SILENT_READ;
267 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
268 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
269 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
270 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
271 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
273 static inline pte_t pte_wrprotect(pte_t pte)
275 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
279 static inline pte_t pte_rdprotect(pte_t pte)
281 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
285 static inline pte_t pte_mkclean(pte_t pte)
287 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
291 static inline pte_t pte_mkold(pte_t pte)
293 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
297 static inline pte_t pte_mkwrite(pte_t pte)
299 pte_val(pte) |= _PAGE_WRITE;
300 if (pte_val(pte) & _PAGE_MODIFIED)
301 pte_val(pte) |= _PAGE_SILENT_WRITE;
305 static inline pte_t pte_mkread(pte_t pte)
307 pte_val(pte) |= _PAGE_READ;
308 if (pte_val(pte) & _PAGE_ACCESSED)
309 pte_val(pte) |= _PAGE_SILENT_READ;
313 static inline pte_t pte_mkdirty(pte_t pte)
315 pte_val(pte) |= _PAGE_MODIFIED;
316 if (pte_val(pte) & _PAGE_WRITE)
317 pte_val(pte) |= _PAGE_SILENT_WRITE;
321 static inline pte_t pte_mkyoung(pte_t pte)
323 pte_val(pte) |= _PAGE_ACCESSED;
324 if (pte_val(pte) & _PAGE_READ)
325 pte_val(pte) |= _PAGE_SILENT_READ;
331 * Macro to make mark a page protection value as "uncacheable". Note
332 * that "protection" is really a misnomer here as the protection value
333 * contains the memory attribute bits, dirty bits, and various other
336 #define pgprot_noncached pgprot_noncached
338 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
340 unsigned long prot = pgprot_val(_prot);
342 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
344 return __pgprot(prot);
348 * Conversion functions: convert a page and protection to a page entry,
349 * and a page entry and page directory to the page they refer to.
351 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
353 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
354 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
356 pte.pte_low &= _PAGE_CHG_MASK;
357 pte.pte_low |= pgprot_val(newprot);
358 pte.pte_high |= pgprot_val(newprot) & 0x3f;
362 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
364 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
369 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
371 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
374 static inline void update_mmu_cache(struct vm_area_struct *vma,
375 unsigned long address, pte_t pte)
377 __update_tlb(vma, address, pte);
378 __update_cache(vma, address, pte);
381 #ifndef CONFIG_NEED_MULTIPLE_NODES
382 #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 #define MK_IOSPACE_PFN(space, pfn) (pfn)
403 #define GET_IOSPACE(pfn) 0
404 #define GET_PFN(pfn) (pfn)
406 #include <asm-generic/pgtable.h>
409 * We provide our own get_unmapped area to cope with the virtual aliasing
410 * constraints placed on us by the cache architecture.
412 #define HAVE_ARCH_UNMAPPED_AREA
415 * No page table caches to initialise
417 #define pgtable_cache_init() do { } while (0)
419 #endif /* _ASM_PGTABLE_H */