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
12 #include <asm/pgtable-32.h>
15 #include <asm/pgtable-64.h>
19 #include <asm/pgtable-bits.h>
22 struct vm_area_struct;
24 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
26 PAGE_CACHABLE_DEFAULT)
27 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
28 PAGE_CACHABLE_DEFAULT)
29 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
30 PAGE_CACHABLE_DEFAULT)
31 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
32 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
33 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
34 PAGE_CACHABLE_DEFAULT)
35 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
39 * MIPS can't do page protection for execute, and considers that the same like
40 * read. Also, write permissions imply read permissions. This is the closest
41 * we can get by reasonable means..
43 #define __P000 PAGE_NONE
44 #define __P001 PAGE_READONLY
45 #define __P010 PAGE_COPY
46 #define __P011 PAGE_COPY
47 #define __P100 PAGE_READONLY
48 #define __P101 PAGE_READONLY
49 #define __P110 PAGE_COPY
50 #define __P111 PAGE_COPY
52 #define __S000 PAGE_NONE
53 #define __S001 PAGE_READONLY
54 #define __S010 PAGE_SHARED
55 #define __S011 PAGE_SHARED
56 #define __S100 PAGE_READONLY
57 #define __S101 PAGE_READONLY
58 #define __S110 PAGE_SHARED
59 #define __S111 PAGE_SHARED
62 * ZERO_PAGE is a global shared page that is always zero; used
63 * for zero-mapped memory areas etc..
66 extern unsigned long empty_zero_page;
67 extern unsigned long zero_page_mask;
69 #define ZERO_PAGE(vaddr) \
70 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
72 #define __HAVE_ARCH_MOVE_PTE
73 #define move_pte(pte, prot, old_addr, new_addr) \
75 pte_t newpte = (pte); \
76 if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
77 pte_page(pte) == ZERO_PAGE(old_addr)) \
78 newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
82 extern void paging_init(void);
85 * Conversion functions: convert a page and protection to a page entry,
86 * and a page entry and page directory to the page they refer to.
88 #define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
89 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
90 #define pmd_page_vaddr(pmd) pmd_val(pmd)
92 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
94 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
95 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
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.pte_low & _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;
112 buddy->pte_high |= _PAGE_GLOBAL;
116 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
118 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
120 pte_t null = __pte(0);
122 /* Preserve global status for the pair */
123 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
124 null.pte_low = null.pte_high = _PAGE_GLOBAL;
126 set_pte_at(mm, addr, ptep, null);
130 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
131 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
134 * Certain architectures need to do special things when pte's
135 * within a page table are directly modified. Thus, the following
136 * hook is made available.
138 static inline void set_pte(pte_t *ptep, pte_t pteval)
141 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
142 if (pte_val(pteval) & _PAGE_GLOBAL) {
143 pte_t *buddy = ptep_buddy(ptep);
145 * Make sure the buddy is global too (if it's !none,
146 * it better already be global)
148 if (pte_none(*buddy))
149 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
153 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
155 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
157 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
158 /* Preserve global status for the pair */
159 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
160 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
163 set_pte_at(mm, addr, ptep, __pte(0));
168 * (pmds are folded into puds so this doesn't get actually called,
169 * but the define is needed for a generic inline function.)
171 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
175 * (puds are folded into pgds so this doesn't get actually called,
176 * but the define is needed for a generic inline function.)
178 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
181 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
182 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
183 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
185 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
188 * The following only work if pte_present() is true.
189 * Undefined behaviour if not..
191 static inline int pte_user(pte_t pte) { BUG(); return 0; }
192 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
193 static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; }
194 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
195 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
196 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
197 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
199 static inline pte_t pte_wrprotect(pte_t pte)
201 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
202 pte.pte_high &= ~_PAGE_SILENT_WRITE;
206 static inline pte_t pte_rdprotect(pte_t pte)
208 pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
209 pte.pte_high &= ~_PAGE_SILENT_READ;
213 static inline pte_t pte_mkclean(pte_t pte)
215 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
216 pte.pte_high &= ~_PAGE_SILENT_WRITE;
220 static inline pte_t pte_mkold(pte_t pte)
222 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
223 pte.pte_high &= ~_PAGE_SILENT_READ;
227 static inline pte_t pte_mkwrite(pte_t pte)
229 pte.pte_low |= _PAGE_WRITE;
230 if (pte.pte_low & _PAGE_MODIFIED) {
231 pte.pte_low |= _PAGE_SILENT_WRITE;
232 pte.pte_high |= _PAGE_SILENT_WRITE;
237 static inline pte_t pte_mkread(pte_t pte)
239 pte.pte_low |= _PAGE_READ;
240 if (pte.pte_low & _PAGE_ACCESSED) {
241 pte.pte_low |= _PAGE_SILENT_READ;
242 pte.pte_high |= _PAGE_SILENT_READ;
247 static inline pte_t pte_mkdirty(pte_t pte)
249 pte.pte_low |= _PAGE_MODIFIED;
250 if (pte.pte_low & _PAGE_WRITE) {
251 pte.pte_low |= _PAGE_SILENT_WRITE;
252 pte.pte_high |= _PAGE_SILENT_WRITE;
257 static inline pte_t pte_mkyoung(pte_t pte)
259 pte.pte_low |= _PAGE_ACCESSED;
260 if (pte.pte_low & _PAGE_READ)
261 pte.pte_low |= _PAGE_SILENT_READ;
262 pte.pte_high |= _PAGE_SILENT_READ;
266 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
267 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
268 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
269 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
270 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
272 static inline pte_t pte_wrprotect(pte_t pte)
274 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
278 static inline pte_t pte_rdprotect(pte_t pte)
280 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
284 static inline pte_t pte_mkclean(pte_t pte)
286 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
290 static inline pte_t pte_mkold(pte_t pte)
292 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
296 static inline pte_t pte_mkwrite(pte_t pte)
298 pte_val(pte) |= _PAGE_WRITE;
299 if (pte_val(pte) & _PAGE_MODIFIED)
300 pte_val(pte) |= _PAGE_SILENT_WRITE;
304 static inline pte_t pte_mkread(pte_t pte)
306 pte_val(pte) |= _PAGE_READ;
307 if (pte_val(pte) & _PAGE_ACCESSED)
308 pte_val(pte) |= _PAGE_SILENT_READ;
312 static inline pte_t pte_mkdirty(pte_t pte)
314 pte_val(pte) |= _PAGE_MODIFIED;
315 if (pte_val(pte) & _PAGE_WRITE)
316 pte_val(pte) |= _PAGE_SILENT_WRITE;
320 static inline pte_t pte_mkyoung(pte_t pte)
322 pte_val(pte) |= _PAGE_ACCESSED;
323 if (pte_val(pte) & _PAGE_READ)
324 pte_val(pte) |= _PAGE_SILENT_READ;
330 * Macro to make mark a page protection value as "uncacheable". Note
331 * that "protection" is really a misnomer here as the protection value
332 * contains the memory attribute bits, dirty bits, and various other
335 #define pgprot_noncached pgprot_noncached
337 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
339 unsigned long prot = pgprot_val(_prot);
341 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
343 return __pgprot(prot);
347 * Conversion functions: convert a page and protection to a page entry,
348 * and a page entry and page directory to the page they refer to.
350 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
352 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
353 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
355 pte.pte_low &= _PAGE_CHG_MASK;
356 pte.pte_high &= ~0x3f;
357 pte.pte_low |= pgprot_val(newprot);
358 pte.pte_high |= pgprot_val(newprot) & 0x3f;
362 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
364 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
369 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
371 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
374 static inline void update_mmu_cache(struct vm_area_struct *vma,
375 unsigned long address, pte_t pte)
377 __update_tlb(vma, address, pte);
378 __update_cache(vma, address, pte);
381 #define kern_addr_valid(addr) (1)
383 #ifdef CONFIG_64BIT_PHYS_ADDR
384 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
386 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
392 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
393 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
396 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
397 remap_pfn_range(vma, vaddr, pfn, size, prot)
400 #define MK_IOSPACE_PFN(space, pfn) (pfn)
401 #define GET_IOSPACE(pfn) 0
402 #define GET_PFN(pfn) (pfn)
404 #include <asm-generic/pgtable.h>
407 * We provide our own get_unmapped area to cope with the virtual aliasing
408 * constraints placed on us by the cache architecture.
410 #define HAVE_ARCH_UNMAPPED_AREA
413 * No page table caches to initialise
415 #define pgtable_cache_init() do { } while (0)
417 #endif /* _ASM_PGTABLE_H */