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 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
94 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
96 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
97 static inline void set_pte(pte_t *ptep, pte_t pte)
99 ptep->pte_high = pte.pte_high;
101 ptep->pte_low = pte.pte_low;
102 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
104 if (pte_val(pte) & _PAGE_GLOBAL) {
105 pte_t *buddy = ptep_buddy(ptep);
107 * Make sure the buddy is global too (if it's !none,
108 * it better already be global)
110 if (pte_none(*buddy))
111 buddy->pte_low |= _PAGE_GLOBAL;
114 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
116 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
118 /* Preserve global status for the pair */
119 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
120 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
122 set_pte_at(mm, addr, ptep, __pte(0));
126 * Certain architectures need to do special things when pte's
127 * within a page table are directly modified. Thus, the following
128 * hook is made available.
130 static inline void set_pte(pte_t *ptep, pte_t pteval)
133 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
134 if (pte_val(pteval) & _PAGE_GLOBAL) {
135 pte_t *buddy = ptep_buddy(ptep);
137 * Make sure the buddy is global too (if it's !none,
138 * it better already be global)
140 if (pte_none(*buddy))
141 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
145 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
147 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
149 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
150 /* Preserve global status for the pair */
151 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
152 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
155 set_pte_at(mm, addr, ptep, __pte(0));
160 * (pmds are folded into puds so this doesn't get actually called,
161 * but the define is needed for a generic inline function.)
163 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
167 * (puds are folded into pgds so this doesn't get actually called,
168 * but the define is needed for a generic inline function.)
170 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
173 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
174 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
175 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
177 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
180 * The following only work if pte_present() is true.
181 * Undefined behaviour if not..
183 static inline int pte_user(pte_t pte) { BUG(); return 0; }
184 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
185 static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
186 static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
187 static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
188 static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
189 static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
190 static inline pte_t pte_wrprotect(pte_t pte)
192 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
193 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
197 static inline pte_t pte_rdprotect(pte_t pte)
199 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
200 (pte).pte_high &= ~_PAGE_SILENT_READ;
204 static inline pte_t pte_mkclean(pte_t pte)
206 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
207 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
211 static inline pte_t pte_mkold(pte_t pte)
213 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
214 (pte).pte_high &= ~_PAGE_SILENT_READ;
218 static inline pte_t pte_mkwrite(pte_t pte)
220 (pte).pte_low |= _PAGE_WRITE;
221 if ((pte).pte_low & _PAGE_MODIFIED) {
222 (pte).pte_low |= _PAGE_SILENT_WRITE;
223 (pte).pte_high |= _PAGE_SILENT_WRITE;
228 static inline pte_t pte_mkread(pte_t pte)
230 (pte).pte_low |= _PAGE_READ;
231 if ((pte).pte_low & _PAGE_ACCESSED) {
232 (pte).pte_low |= _PAGE_SILENT_READ;
233 (pte).pte_high |= _PAGE_SILENT_READ;
238 static inline pte_t pte_mkdirty(pte_t pte)
240 (pte).pte_low |= _PAGE_MODIFIED;
241 if ((pte).pte_low & _PAGE_WRITE) {
242 (pte).pte_low |= _PAGE_SILENT_WRITE;
243 (pte).pte_high |= _PAGE_SILENT_WRITE;
248 static inline pte_t pte_mkyoung(pte_t pte)
250 (pte).pte_low |= _PAGE_ACCESSED;
251 if ((pte).pte_low & _PAGE_READ)
252 (pte).pte_low |= _PAGE_SILENT_READ;
253 (pte).pte_high |= _PAGE_SILENT_READ;
257 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
258 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
259 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
260 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
261 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
263 static inline pte_t pte_wrprotect(pte_t pte)
265 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
269 static inline pte_t pte_rdprotect(pte_t pte)
271 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
275 static inline pte_t pte_mkclean(pte_t pte)
277 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
281 static inline pte_t pte_mkold(pte_t pte)
283 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
287 static inline pte_t pte_mkwrite(pte_t pte)
289 pte_val(pte) |= _PAGE_WRITE;
290 if (pte_val(pte) & _PAGE_MODIFIED)
291 pte_val(pte) |= _PAGE_SILENT_WRITE;
295 static inline pte_t pte_mkread(pte_t pte)
297 pte_val(pte) |= _PAGE_READ;
298 if (pte_val(pte) & _PAGE_ACCESSED)
299 pte_val(pte) |= _PAGE_SILENT_READ;
303 static inline pte_t pte_mkdirty(pte_t pte)
305 pte_val(pte) |= _PAGE_MODIFIED;
306 if (pte_val(pte) & _PAGE_WRITE)
307 pte_val(pte) |= _PAGE_SILENT_WRITE;
311 static inline pte_t pte_mkyoung(pte_t pte)
313 pte_val(pte) |= _PAGE_ACCESSED;
314 if (pte_val(pte) & _PAGE_READ)
315 pte_val(pte) |= _PAGE_SILENT_READ;
321 * Macro to make mark a page protection value as "uncacheable". Note
322 * that "protection" is really a misnomer here as the protection value
323 * contains the memory attribute bits, dirty bits, and various other
326 #define pgprot_noncached pgprot_noncached
328 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
330 unsigned long prot = pgprot_val(_prot);
332 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
334 return __pgprot(prot);
338 * Conversion functions: convert a page and protection to a page entry,
339 * and a page entry and page directory to the page they refer to.
341 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
343 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
344 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
346 pte.pte_low &= _PAGE_CHG_MASK;
347 pte.pte_low |= pgprot_val(newprot);
348 pte.pte_high |= pgprot_val(newprot) & 0x3f;
352 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
354 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
359 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
361 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
364 static inline void update_mmu_cache(struct vm_area_struct *vma,
365 unsigned long address, pte_t pte)
367 __update_tlb(vma, address, pte);
368 __update_cache(vma, address, pte);
371 #ifndef CONFIG_NEED_MULTIPLE_NODES
372 #define kern_addr_valid(addr) (1)
375 #ifdef CONFIG_64BIT_PHYS_ADDR
376 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
378 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
384 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
385 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
388 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
389 remap_pfn_range(vma, vaddr, pfn, size, prot)
392 #define MK_IOSPACE_PFN(space, pfn) (pfn)
393 #define GET_IOSPACE(pfn) 0
394 #define GET_PFN(pfn) (pfn)
396 #include <asm-generic/pgtable.h>
399 * We provide our own get_unmapped area to cope with the virtual aliasing
400 * constraints placed on us by the cache architecture.
402 #define HAVE_ARCH_UNMAPPED_AREA
405 * No page table caches to initialise
407 #define pgtable_cache_init() do { } while (0)
409 #endif /* _ASM_PGTABLE_H */