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>
22 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
23 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
24 PAGE_CACHABLE_DEFAULT)
25 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
26 PAGE_CACHABLE_DEFAULT)
27 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
28 PAGE_CACHABLE_DEFAULT)
29 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
30 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
31 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
32 PAGE_CACHABLE_DEFAULT)
33 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
34 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
37 * MIPS can't do page protection for execute, and considers that the same like
38 * read. Also, write permissions imply read permissions. This is the closest
39 * we can get by reasonable means..
41 #define __P000 PAGE_NONE
42 #define __P001 PAGE_READONLY
43 #define __P010 PAGE_COPY
44 #define __P011 PAGE_COPY
45 #define __P100 PAGE_READONLY
46 #define __P101 PAGE_READONLY
47 #define __P110 PAGE_COPY
48 #define __P111 PAGE_COPY
50 #define __S000 PAGE_NONE
51 #define __S001 PAGE_READONLY
52 #define __S010 PAGE_SHARED
53 #define __S011 PAGE_SHARED
54 #define __S100 PAGE_READONLY
55 #define __S101 PAGE_READONLY
56 #define __S110 PAGE_SHARED
57 #define __S111 PAGE_SHARED
60 * ZERO_PAGE is a global shared page that is always zero; used
61 * for zero-mapped memory areas etc..
64 extern unsigned long empty_zero_page;
65 extern unsigned long zero_page_mask;
67 #define ZERO_PAGE(vaddr) \
68 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
70 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
72 extern void paging_init(void);
75 * Conversion functions: convert a page and protection to a page entry,
76 * and a page entry and page directory to the page they refer to.
78 #define page_pte(page) page_pte_prot(page, __pgprot(0))
79 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
80 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
81 #define pmd_page_kernel(pmd) pmd_val(pmd)
83 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
84 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
86 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
87 static inline void set_pte(pte_t *ptep, pte_t pte)
89 ptep->pte_high = pte.pte_high;
91 ptep->pte_low = pte.pte_low;
92 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
94 if (pte_val(pte) & _PAGE_GLOBAL) {
95 pte_t *buddy = ptep_buddy(ptep);
97 * Make sure the buddy is global too (if it's !none,
98 * it better already be global)
100 if (pte_none(*buddy))
101 buddy->pte_low |= _PAGE_GLOBAL;
104 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
106 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
108 /* Preserve global status for the pair */
109 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
110 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
112 set_pte_at(mm, addr, ptep, __pte(0));
116 * Certain architectures need to do special things when pte's
117 * within a page table are directly modified. Thus, the following
118 * hook is made available.
120 static inline void set_pte(pte_t *ptep, pte_t pteval)
123 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
124 if (pte_val(pteval) & _PAGE_GLOBAL) {
125 pte_t *buddy = ptep_buddy(ptep);
127 * Make sure the buddy is global too (if it's !none,
128 * it better already be global)
130 if (pte_none(*buddy))
131 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
135 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
137 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
139 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
140 /* Preserve global status for the pair */
141 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
142 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
145 set_pte_at(mm, addr, ptep, __pte(0));
150 * (pmds are folded into puds so this doesn't get actually called,
151 * but the define is needed for a generic inline function.)
153 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
157 * (puds are folded into pgds so this doesn't get actually called,
158 * but the define is needed for a generic inline function.)
160 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
163 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
164 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
165 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
167 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
170 * The following only work if pte_present() is true.
171 * Undefined behaviour if not..
173 static inline int pte_user(pte_t pte) { BUG(); return 0; }
174 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
175 static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
176 static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
177 static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
178 static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
179 static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
180 static inline pte_t pte_wrprotect(pte_t pte)
182 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
183 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
187 static inline pte_t pte_rdprotect(pte_t pte)
189 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
190 (pte).pte_high &= ~_PAGE_SILENT_READ;
194 static inline pte_t pte_mkclean(pte_t pte)
196 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
197 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
201 static inline pte_t pte_mkold(pte_t pte)
203 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
204 (pte).pte_high &= ~_PAGE_SILENT_READ;
208 static inline pte_t pte_mkwrite(pte_t pte)
210 (pte).pte_low |= _PAGE_WRITE;
211 if ((pte).pte_low & _PAGE_MODIFIED) {
212 (pte).pte_low |= _PAGE_SILENT_WRITE;
213 (pte).pte_high |= _PAGE_SILENT_WRITE;
218 static inline pte_t pte_mkread(pte_t pte)
220 (pte).pte_low |= _PAGE_READ;
221 if ((pte).pte_low & _PAGE_ACCESSED) {
222 (pte).pte_low |= _PAGE_SILENT_READ;
223 (pte).pte_high |= _PAGE_SILENT_READ;
228 static inline pte_t pte_mkdirty(pte_t pte)
230 (pte).pte_low |= _PAGE_MODIFIED;
231 if ((pte).pte_low & _PAGE_WRITE) {
232 (pte).pte_low |= _PAGE_SILENT_WRITE;
233 (pte).pte_high |= _PAGE_SILENT_WRITE;
238 static inline pte_t pte_mkyoung(pte_t pte)
240 (pte).pte_low |= _PAGE_ACCESSED;
241 if ((pte).pte_low & _PAGE_READ)
242 (pte).pte_low |= _PAGE_SILENT_READ;
243 (pte).pte_high |= _PAGE_SILENT_READ;
247 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
248 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
249 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
250 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
251 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
253 static inline pte_t pte_wrprotect(pte_t pte)
255 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
259 static inline pte_t pte_rdprotect(pte_t pte)
261 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
265 static inline pte_t pte_mkclean(pte_t pte)
267 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
271 static inline pte_t pte_mkold(pte_t pte)
273 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
277 static inline pte_t pte_mkwrite(pte_t pte)
279 pte_val(pte) |= _PAGE_WRITE;
280 if (pte_val(pte) & _PAGE_MODIFIED)
281 pte_val(pte) |= _PAGE_SILENT_WRITE;
285 static inline pte_t pte_mkread(pte_t pte)
287 pte_val(pte) |= _PAGE_READ;
288 if (pte_val(pte) & _PAGE_ACCESSED)
289 pte_val(pte) |= _PAGE_SILENT_READ;
293 static inline pte_t pte_mkdirty(pte_t pte)
295 pte_val(pte) |= _PAGE_MODIFIED;
296 if (pte_val(pte) & _PAGE_WRITE)
297 pte_val(pte) |= _PAGE_SILENT_WRITE;
301 static inline pte_t pte_mkyoung(pte_t pte)
303 pte_val(pte) |= _PAGE_ACCESSED;
304 if (pte_val(pte) & _PAGE_READ)
305 pte_val(pte) |= _PAGE_SILENT_READ;
311 * Macro to make mark a page protection value as "uncacheable". Note
312 * that "protection" is really a misnomer here as the protection value
313 * contains the memory attribute bits, dirty bits, and various other
316 #define pgprot_noncached pgprot_noncached
318 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
320 unsigned long prot = pgprot_val(_prot);
322 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
324 return __pgprot(prot);
328 * Conversion functions: convert a page and protection to a page entry,
329 * and a page entry and page directory to the page they refer to.
331 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
333 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
334 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
336 pte.pte_low &= _PAGE_CHG_MASK;
337 pte.pte_low |= pgprot_val(newprot);
338 pte.pte_high |= pgprot_val(newprot) & 0x3f;
342 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
344 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
349 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
351 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
354 static inline void update_mmu_cache(struct vm_area_struct *vma,
355 unsigned long address, pte_t pte)
357 __update_tlb(vma, address, pte);
358 __update_cache(vma, address, pte);
361 #ifndef CONFIG_NEED_MULTIPLE_NODES
362 #define kern_addr_valid(addr) (1)
365 #ifdef CONFIG_64BIT_PHYS_ADDR
366 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
368 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
374 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
375 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
378 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
379 remap_pfn_range(vma, vaddr, pfn, size, prot)
382 #define MK_IOSPACE_PFN(space, pfn) (pfn)
383 #define GET_IOSPACE(pfn) 0
384 #define GET_PFN(pfn) (pfn)
386 #include <asm-generic/pgtable.h>
389 * We provide our own get_unmapped area to cope with the virtual aliasing
390 * constraints placed on us by the cache architecture.
392 #define HAVE_ARCH_UNMAPPED_AREA
395 * No page table caches to initialise
397 #define pgtable_cache_init() do { } while (0)
399 #endif /* _ASM_PGTABLE_H */