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 <asm-generic/4level-fixup.h>
13 #include <linux/config.h>
15 #include <asm/pgtable-32.h>
18 #include <asm/pgtable-64.h>
21 #include <asm/pgtable-bits.h>
23 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
24 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
25 PAGE_CACHABLE_DEFAULT)
26 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
27 PAGE_CACHABLE_DEFAULT)
28 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
32 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
33 PAGE_CACHABLE_DEFAULT)
34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
38 * MIPS can't do page protection for execute, and considers that the same like
39 * read. Also, write permissions imply read permissions. This is the closest
40 * we can get by reasonable means..
42 #define __P000 PAGE_NONE
43 #define __P001 PAGE_READONLY
44 #define __P010 PAGE_COPY
45 #define __P011 PAGE_COPY
46 #define __P100 PAGE_READONLY
47 #define __P101 PAGE_READONLY
48 #define __P110 PAGE_COPY
49 #define __P111 PAGE_COPY
51 #define __S000 PAGE_NONE
52 #define __S001 PAGE_READONLY
53 #define __S010 PAGE_SHARED
54 #define __S011 PAGE_SHARED
55 #define __S100 PAGE_READONLY
56 #define __S101 PAGE_READONLY
57 #define __S110 PAGE_SHARED
58 #define __S111 PAGE_SHARED
61 * ZERO_PAGE is a global shared page that is always zero; used
62 * for zero-mapped memory areas etc..
65 extern unsigned long empty_zero_page;
66 extern unsigned long zero_page_mask;
68 #define ZERO_PAGE(vaddr) \
69 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
71 extern void paging_init(void);
74 * Conversion functions: convert a page and protection to a page entry,
75 * and a page entry and page directory to the page they refer to.
77 #define page_pte(page) page_pte_prot(page, __pgprot(0))
78 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
79 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
80 #define pmd_page_kernel(pmd) pmd_val(pmd)
82 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
83 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
85 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
86 static inline void set_pte(pte_t *ptep, pte_t pte)
88 ptep->pte_high = pte.pte_high;
90 ptep->pte_low = pte.pte_low;
91 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
93 if (pte_val(pte) & _PAGE_GLOBAL) {
94 pte_t *buddy = ptep_buddy(ptep);
96 * Make sure the buddy is global too (if it's !none,
97 * it better already be global)
100 buddy->pte_low |= _PAGE_GLOBAL;
104 static inline void pte_clear(pte_t *ptep)
106 /* Preserve global status for the pair */
107 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
108 set_pte(ptep, __pte(_PAGE_GLOBAL));
110 set_pte(ptep, __pte(0));
114 * Certain architectures need to do special things when pte's
115 * within a page table are directly modified. Thus, the following
116 * hook is made available.
118 static inline void set_pte(pte_t *ptep, pte_t pteval)
121 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
122 if (pte_val(pteval) & _PAGE_GLOBAL) {
123 pte_t *buddy = ptep_buddy(ptep);
125 * Make sure the buddy is global too (if it's !none,
126 * it better already be global)
128 if (pte_none(*buddy))
129 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
134 static inline void pte_clear(pte_t *ptep)
136 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
137 /* Preserve global status for the pair */
138 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
139 set_pte(ptep, __pte(_PAGE_GLOBAL));
142 set_pte(ptep, __pte(0));
147 * (pmds are folded into pgds so this doesn't get actually called,
148 * but the define is needed for a generic inline function.)
150 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
151 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
153 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
154 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
155 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
157 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
160 * The following only work if pte_present() is true.
161 * Undefined behaviour if not..
163 static inline int pte_user(pte_t pte) { BUG(); return 0; }
164 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
165 static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
166 static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
167 static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
168 static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
169 static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
170 static inline pte_t pte_wrprotect(pte_t pte)
172 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
173 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
177 static inline pte_t pte_rdprotect(pte_t pte)
179 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
180 (pte).pte_high &= ~_PAGE_SILENT_READ;
184 static inline pte_t pte_mkclean(pte_t pte)
186 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
187 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
191 static inline pte_t pte_mkold(pte_t pte)
193 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
194 (pte).pte_high &= ~_PAGE_SILENT_READ;
198 static inline pte_t pte_mkwrite(pte_t pte)
200 (pte).pte_low |= _PAGE_WRITE;
201 if ((pte).pte_low & _PAGE_MODIFIED) {
202 (pte).pte_low |= _PAGE_SILENT_WRITE;
203 (pte).pte_high |= _PAGE_SILENT_WRITE;
208 static inline pte_t pte_mkread(pte_t pte)
210 (pte).pte_low |= _PAGE_READ;
211 if ((pte).pte_low & _PAGE_ACCESSED) {
212 (pte).pte_low |= _PAGE_SILENT_READ;
213 (pte).pte_high |= _PAGE_SILENT_READ;
218 static inline pte_t pte_mkdirty(pte_t pte)
220 (pte).pte_low |= _PAGE_MODIFIED;
221 if ((pte).pte_low & _PAGE_WRITE) {
222 (pte).pte_low |= _PAGE_SILENT_WRITE;
223 (pte).pte_high |= _PAGE_SILENT_WRITE;
228 static inline pte_t pte_mkyoung(pte_t pte)
230 (pte).pte_low |= _PAGE_ACCESSED;
231 if ((pte).pte_low & _PAGE_READ)
232 (pte).pte_low |= _PAGE_SILENT_READ;
233 (pte).pte_high |= _PAGE_SILENT_READ;
237 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
238 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
239 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
240 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
241 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
243 static inline pte_t pte_wrprotect(pte_t pte)
245 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
249 static inline pte_t pte_rdprotect(pte_t pte)
251 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
255 static inline pte_t pte_mkclean(pte_t pte)
257 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
261 static inline pte_t pte_mkold(pte_t pte)
263 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
267 static inline pte_t pte_mkwrite(pte_t pte)
269 pte_val(pte) |= _PAGE_WRITE;
270 if (pte_val(pte) & _PAGE_MODIFIED)
271 pte_val(pte) |= _PAGE_SILENT_WRITE;
275 static inline pte_t pte_mkread(pte_t pte)
277 pte_val(pte) |= _PAGE_READ;
278 if (pte_val(pte) & _PAGE_ACCESSED)
279 pte_val(pte) |= _PAGE_SILENT_READ;
283 static inline pte_t pte_mkdirty(pte_t pte)
285 pte_val(pte) |= _PAGE_MODIFIED;
286 if (pte_val(pte) & _PAGE_WRITE)
287 pte_val(pte) |= _PAGE_SILENT_WRITE;
291 static inline pte_t pte_mkyoung(pte_t pte)
293 pte_val(pte) |= _PAGE_ACCESSED;
294 if (pte_val(pte) & _PAGE_READ)
295 pte_val(pte) |= _PAGE_SILENT_READ;
301 * Macro to make mark a page protection value as "uncacheable". Note
302 * that "protection" is really a misnomer here as the protection value
303 * contains the memory attribute bits, dirty bits, and various other
306 #define pgprot_noncached pgprot_noncached
308 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
310 unsigned long prot = pgprot_val(_prot);
312 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
314 return __pgprot(prot);
318 * Conversion functions: convert a page and protection to a page entry,
319 * and a page entry and page directory to the page they refer to.
321 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
323 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
324 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
326 pte.pte_low &= _PAGE_CHG_MASK;
327 pte.pte_low |= pgprot_val(newprot);
328 pte.pte_high |= pgprot_val(newprot) & 0x3f;
332 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
334 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
339 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
341 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
344 static inline void update_mmu_cache(struct vm_area_struct *vma,
345 unsigned long address, pte_t pte)
347 __update_tlb(vma, address, pte);
348 __update_cache(vma, address, pte);
351 #ifndef CONFIG_DISCONTIGMEM
352 #define kern_addr_valid(addr) (1)
355 #ifdef CONFIG_64BIT_PHYS_ADDR
356 extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
357 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
359 static inline int io_remap_page_range(struct vm_area_struct *vma,
365 phys_t phys_addr_high = fixup_bigphys_addr(paddr, size);
366 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
369 #define io_remap_page_range(vma, vaddr, paddr, size, prot) \
370 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
373 #include <asm-generic/pgtable.h>
376 * We provide our own get_unmapped area to cope with the virtual aliasing
377 * constraints placed on us by the cache architecture.
379 #define HAVE_ARCH_UNMAPPED_AREA
382 * No page table caches to initialise
384 #define pgtable_cache_init() do { } while (0)
386 #endif /* _ASM_PGTABLE_H */