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_MULTIPLE_ZERO_PAGE
75 extern void paging_init(void);
78 * Conversion functions: convert a page and protection to a page entry,
79 * and a page entry and page directory to the page they refer to.
81 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
82 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
83 #define pmd_page_kernel(pmd) pmd_val(pmd)
85 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
87 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
88 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
90 static inline void set_pte(pte_t *ptep, pte_t pte)
92 ptep->pte_high = pte.pte_high;
94 ptep->pte_low = pte.pte_low;
95 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
97 if (pte.pte_low & _PAGE_GLOBAL) {
98 pte_t *buddy = ptep_buddy(ptep);
100 * Make sure the buddy is global too (if it's !none,
101 * it better already be global)
103 if (pte_none(*buddy)) {
104 buddy->pte_low |= _PAGE_GLOBAL;
105 buddy->pte_high |= _PAGE_GLOBAL;
109 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
111 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
113 pte_t null = __pte(0);
115 /* Preserve global status for the pair */
116 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
117 null.pte_low = null.pte_high = _PAGE_GLOBAL;
119 set_pte_at(mm, addr, ptep, null);
123 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
124 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
127 * Certain architectures need to do special things when pte's
128 * within a page table are directly modified. Thus, the following
129 * hook is made available.
131 static inline void set_pte(pte_t *ptep, pte_t pteval)
134 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
135 if (pte_val(pteval) & _PAGE_GLOBAL) {
136 pte_t *buddy = ptep_buddy(ptep);
138 * Make sure the buddy is global too (if it's !none,
139 * it better already be global)
141 if (pte_none(*buddy))
142 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
146 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
148 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
150 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
151 /* Preserve global status for the pair */
152 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
153 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
156 set_pte_at(mm, addr, ptep, __pte(0));
161 * (pmds are folded into puds so this doesn't get actually called,
162 * but the define is needed for a generic inline function.)
164 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
168 * (puds are folded into pgds so this doesn't get actually called,
169 * but the define is needed for a generic inline function.)
171 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
174 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
175 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
176 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
178 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
181 * The following only work if pte_present() is true.
182 * Undefined behaviour if not..
184 static inline int pte_user(pte_t pte) { BUG(); return 0; }
185 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
186 static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; }
187 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
188 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
189 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
190 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
192 static inline pte_t pte_wrprotect(pte_t pte)
194 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
195 pte.pte_high &= ~_PAGE_SILENT_WRITE;
199 static inline pte_t pte_rdprotect(pte_t pte)
201 pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
202 pte.pte_high &= ~_PAGE_SILENT_READ;
206 static inline pte_t pte_mkclean(pte_t pte)
208 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
209 pte.pte_high &= ~_PAGE_SILENT_WRITE;
213 static inline pte_t pte_mkold(pte_t pte)
215 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
216 pte.pte_high &= ~_PAGE_SILENT_READ;
220 static inline pte_t pte_mkwrite(pte_t pte)
222 pte.pte_low |= _PAGE_WRITE;
223 if (pte.pte_low & _PAGE_MODIFIED) {
224 pte.pte_low |= _PAGE_SILENT_WRITE;
225 pte.pte_high |= _PAGE_SILENT_WRITE;
230 static inline pte_t pte_mkread(pte_t pte)
232 pte.pte_low |= _PAGE_READ;
233 if (pte.pte_low & _PAGE_ACCESSED) {
234 pte.pte_low |= _PAGE_SILENT_READ;
235 pte.pte_high |= _PAGE_SILENT_READ;
240 static inline pte_t pte_mkdirty(pte_t pte)
242 pte.pte_low |= _PAGE_MODIFIED;
243 if (pte.pte_low & _PAGE_WRITE) {
244 pte.pte_low |= _PAGE_SILENT_WRITE;
245 pte.pte_high |= _PAGE_SILENT_WRITE;
250 static inline pte_t pte_mkyoung(pte_t pte)
252 pte.pte_low |= _PAGE_ACCESSED;
253 if (pte.pte_low & _PAGE_READ)
254 pte.pte_low |= _PAGE_SILENT_READ;
255 pte.pte_high |= _PAGE_SILENT_READ;
259 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
260 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
261 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
262 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
263 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
265 static inline pte_t pte_wrprotect(pte_t pte)
267 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
271 static inline pte_t pte_rdprotect(pte_t pte)
273 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
277 static inline pte_t pte_mkclean(pte_t pte)
279 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
283 static inline pte_t pte_mkold(pte_t pte)
285 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
289 static inline pte_t pte_mkwrite(pte_t pte)
291 pte_val(pte) |= _PAGE_WRITE;
292 if (pte_val(pte) & _PAGE_MODIFIED)
293 pte_val(pte) |= _PAGE_SILENT_WRITE;
297 static inline pte_t pte_mkread(pte_t pte)
299 pte_val(pte) |= _PAGE_READ;
300 if (pte_val(pte) & _PAGE_ACCESSED)
301 pte_val(pte) |= _PAGE_SILENT_READ;
305 static inline pte_t pte_mkdirty(pte_t pte)
307 pte_val(pte) |= _PAGE_MODIFIED;
308 if (pte_val(pte) & _PAGE_WRITE)
309 pte_val(pte) |= _PAGE_SILENT_WRITE;
313 static inline pte_t pte_mkyoung(pte_t pte)
315 pte_val(pte) |= _PAGE_ACCESSED;
316 if (pte_val(pte) & _PAGE_READ)
317 pte_val(pte) |= _PAGE_SILENT_READ;
323 * Macro to make mark a page protection value as "uncacheable". Note
324 * that "protection" is really a misnomer here as the protection value
325 * contains the memory attribute bits, dirty bits, and various other
328 #define pgprot_noncached pgprot_noncached
330 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
332 unsigned long prot = pgprot_val(_prot);
334 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
336 return __pgprot(prot);
340 * Conversion functions: convert a page and protection to a page entry,
341 * and a page entry and page directory to the page they refer to.
343 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
345 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
346 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
348 pte.pte_low &= _PAGE_CHG_MASK;
349 pte.pte_low |= pgprot_val(newprot);
350 pte.pte_high |= pgprot_val(newprot) & 0x3f;
354 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
356 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
361 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
363 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
366 static inline void update_mmu_cache(struct vm_area_struct *vma,
367 unsigned long address, pte_t pte)
369 __update_tlb(vma, address, pte);
370 __update_cache(vma, address, pte);
373 #ifndef CONFIG_NEED_MULTIPLE_NODES
374 #define kern_addr_valid(addr) (1)
377 #ifdef CONFIG_64BIT_PHYS_ADDR
378 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
380 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
386 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
387 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
390 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
391 remap_pfn_range(vma, vaddr, pfn, size, prot)
394 #define MK_IOSPACE_PFN(space, pfn) (pfn)
395 #define GET_IOSPACE(pfn) 0
396 #define GET_PFN(pfn) (pfn)
398 #include <asm-generic/pgtable.h>
401 * We provide our own get_unmapped area to cope with the virtual aliasing
402 * constraints placed on us by the cache architecture.
404 #define HAVE_ARCH_UNMAPPED_AREA
407 * No page table caches to initialise
409 #define pgtable_cache_init() do { } while (0)
411 #endif /* _ASM_PGTABLE_H */