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>
19 #include <asm/pgtable-bits.h>
21 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
22 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
23 PAGE_CACHABLE_DEFAULT)
24 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
25 PAGE_CACHABLE_DEFAULT)
26 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
27 PAGE_CACHABLE_DEFAULT)
28 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
29 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
30 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
31 PAGE_CACHABLE_DEFAULT)
32 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
33 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
36 * MIPS can't do page protection for execute, and considers that the same like
37 * read. Also, write permissions imply read permissions. This is the closest
38 * we can get by reasonable means..
40 #define __P000 PAGE_NONE
41 #define __P001 PAGE_READONLY
42 #define __P010 PAGE_COPY
43 #define __P011 PAGE_COPY
44 #define __P100 PAGE_READONLY
45 #define __P101 PAGE_READONLY
46 #define __P110 PAGE_COPY
47 #define __P111 PAGE_COPY
49 #define __S000 PAGE_NONE
50 #define __S001 PAGE_READONLY
51 #define __S010 PAGE_SHARED
52 #define __S011 PAGE_SHARED
53 #define __S100 PAGE_READONLY
54 #define __S101 PAGE_READONLY
55 #define __S110 PAGE_SHARED
56 #define __S111 PAGE_SHARED
59 * ZERO_PAGE is a global shared page that is always zero; used
60 * for zero-mapped memory areas etc..
63 extern unsigned long empty_zero_page;
64 extern unsigned long zero_page_mask;
66 #define ZERO_PAGE(vaddr) \
67 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
69 extern void paging_init(void);
72 * Conversion functions: convert a page and protection to a page entry,
73 * and a page entry and page directory to the page they refer to.
75 #define page_pte(page) page_pte_prot(page, __pgprot(0))
76 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
77 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
78 #define pmd_page_kernel(pmd) pmd_val(pmd)
80 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
81 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
83 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
84 static inline void set_pte(pte_t *ptep, pte_t pte)
86 ptep->pte_high = pte.pte_high;
88 ptep->pte_low = pte.pte_low;
89 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
91 if (pte_val(pte) & _PAGE_GLOBAL) {
92 pte_t *buddy = ptep_buddy(ptep);
94 * Make sure the buddy is global too (if it's !none,
95 * it better already be global)
98 buddy->pte_low |= _PAGE_GLOBAL;
102 static inline void pte_clear(pte_t *ptep)
104 /* Preserve global status for the pair */
105 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
106 set_pte(ptep, __pte(_PAGE_GLOBAL));
108 set_pte(ptep, __pte(0));
112 * Certain architectures need to do special things when pte's
113 * within a page table are directly modified. Thus, the following
114 * hook is made available.
116 static inline void set_pte(pte_t *ptep, pte_t pteval)
119 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
120 if (pte_val(pteval) & _PAGE_GLOBAL) {
121 pte_t *buddy = ptep_buddy(ptep);
123 * Make sure the buddy is global too (if it's !none,
124 * it better already be global)
126 if (pte_none(*buddy))
127 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
132 static inline void pte_clear(pte_t *ptep)
134 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
135 /* Preserve global status for the pair */
136 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
137 set_pte(ptep, __pte(_PAGE_GLOBAL));
140 set_pte(ptep, __pte(0));
145 * (pmds are folded into pgds so this doesn't get actually called,
146 * but the define is needed for a generic inline function.)
148 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
149 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
151 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
152 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
153 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
155 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
158 * The following only work if pte_present() is true.
159 * Undefined behaviour if not..
161 static inline int pte_user(pte_t pte) { BUG(); return 0; }
162 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
163 static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
164 static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
165 static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
166 static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
167 static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
168 static inline pte_t pte_wrprotect(pte_t pte)
170 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
171 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
175 static inline pte_t pte_rdprotect(pte_t pte)
177 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
178 (pte).pte_high &= ~_PAGE_SILENT_READ;
182 static inline pte_t pte_mkclean(pte_t pte)
184 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
185 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
189 static inline pte_t pte_mkold(pte_t pte)
191 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
192 (pte).pte_high &= ~_PAGE_SILENT_READ;
196 static inline pte_t pte_mkwrite(pte_t pte)
198 (pte).pte_low |= _PAGE_WRITE;
199 if ((pte).pte_low & _PAGE_MODIFIED) {
200 (pte).pte_low |= _PAGE_SILENT_WRITE;
201 (pte).pte_high |= _PAGE_SILENT_WRITE;
206 static inline pte_t pte_mkread(pte_t pte)
208 (pte).pte_low |= _PAGE_READ;
209 if ((pte).pte_low & _PAGE_ACCESSED) {
210 (pte).pte_low |= _PAGE_SILENT_READ;
211 (pte).pte_high |= _PAGE_SILENT_READ;
216 static inline pte_t pte_mkdirty(pte_t pte)
218 (pte).pte_low |= _PAGE_MODIFIED;
219 if ((pte).pte_low & _PAGE_WRITE) {
220 (pte).pte_low |= _PAGE_SILENT_WRITE;
221 (pte).pte_high |= _PAGE_SILENT_WRITE;
226 static inline pte_t pte_mkyoung(pte_t pte)
228 (pte).pte_low |= _PAGE_ACCESSED;
229 if ((pte).pte_low & _PAGE_READ)
230 (pte).pte_low |= _PAGE_SILENT_READ;
231 (pte).pte_high |= _PAGE_SILENT_READ;
235 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
236 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
237 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
238 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
239 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
241 static inline pte_t pte_wrprotect(pte_t pte)
243 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
247 static inline pte_t pte_rdprotect(pte_t pte)
249 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
253 static inline pte_t pte_mkclean(pte_t pte)
255 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
259 static inline pte_t pte_mkold(pte_t pte)
261 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
265 static inline pte_t pte_mkwrite(pte_t pte)
267 pte_val(pte) |= _PAGE_WRITE;
268 if (pte_val(pte) & _PAGE_MODIFIED)
269 pte_val(pte) |= _PAGE_SILENT_WRITE;
273 static inline pte_t pte_mkread(pte_t pte)
275 pte_val(pte) |= _PAGE_READ;
276 if (pte_val(pte) & _PAGE_ACCESSED)
277 pte_val(pte) |= _PAGE_SILENT_READ;
281 static inline pte_t pte_mkdirty(pte_t pte)
283 pte_val(pte) |= _PAGE_MODIFIED;
284 if (pte_val(pte) & _PAGE_WRITE)
285 pte_val(pte) |= _PAGE_SILENT_WRITE;
289 static inline pte_t pte_mkyoung(pte_t pte)
291 pte_val(pte) |= _PAGE_ACCESSED;
292 if (pte_val(pte) & _PAGE_READ)
293 pte_val(pte) |= _PAGE_SILENT_READ;
299 * Macro to make mark a page protection value as "uncacheable". Note
300 * that "protection" is really a misnomer here as the protection value
301 * contains the memory attribute bits, dirty bits, and various other
304 #define pgprot_noncached pgprot_noncached
306 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
308 unsigned long prot = pgprot_val(_prot);
310 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
312 return __pgprot(prot);
316 * Conversion functions: convert a page and protection to a page entry,
317 * and a page entry and page directory to the page they refer to.
319 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
321 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
322 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
324 pte.pte_low &= _PAGE_CHG_MASK;
325 pte.pte_low |= pgprot_val(newprot);
326 pte.pte_high |= pgprot_val(newprot) & 0x3f;
330 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
332 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
337 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
339 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
342 static inline void update_mmu_cache(struct vm_area_struct *vma,
343 unsigned long address, pte_t pte)
345 __update_tlb(vma, address, pte);
346 __update_cache(vma, address, pte);
349 #ifndef CONFIG_DISCONTIGMEM
350 #define kern_addr_valid(addr) (1)
353 #ifdef CONFIG_64BIT_PHYS_ADDR
354 extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
355 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
357 static inline int io_remap_page_range(struct vm_area_struct *vma,
363 phys_t phys_addr_high = fixup_bigphys_addr(paddr, size);
364 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
367 #define io_remap_page_range(vma, vaddr, paddr, size, prot) \
368 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
371 #include <asm-generic/pgtable.h>
374 * We provide our own get_unmapped area to cope with the virtual aliasing
375 * constraints placed on us by the cache architecture.
377 #define HAVE_ARCH_UNMAPPED_AREA
380 * No page table caches to initialise
382 #define pgtable_cache_init() do { } while (0)
384 #endif /* _ASM_PGTABLE_H */