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)
84 * Certain architectures need to do special things when pte's
85 * within a page table are directly modified. Thus, the following
86 * hook is made available.
88 static inline void set_pte(pte_t *ptep, pte_t pteval)
91 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
92 if (pte_val(pteval) & _PAGE_GLOBAL) {
93 pte_t *buddy = ptep_buddy(ptep);
95 * Make sure the buddy is global too (if it's !none,
96 * it better already be global)
99 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
104 static inline void pte_clear(pte_t *ptep)
106 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
107 /* Preserve global status for the pair */
108 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
109 set_pte(ptep, __pte(_PAGE_GLOBAL));
112 set_pte(ptep, __pte(0));
116 * (pmds are folded into pgds so this doesn't get actually called,
117 * but the define is needed for a generic inline function.)
119 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
120 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
122 #define PGD_T_LOG2 ffz(~sizeof(pgd_t))
123 #define PMD_T_LOG2 ffz(~sizeof(pmd_t))
124 #define PTE_T_LOG2 ffz(~sizeof(pte_t))
126 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
128 #define PTE_FILE_MAX_BITS 27
131 * The following only work if pte_present() is true.
132 * Undefined behaviour if not..
134 static inline int pte_user(pte_t pte) { BUG(); return 0; }
135 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
136 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
137 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
138 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
139 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
141 static inline pte_t pte_wrprotect(pte_t pte)
143 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
147 static inline pte_t pte_rdprotect(pte_t pte)
149 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
153 static inline pte_t pte_mkclean(pte_t pte)
155 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
159 static inline pte_t pte_mkold(pte_t pte)
161 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
165 static inline pte_t pte_mkwrite(pte_t pte)
167 pte_val(pte) |= _PAGE_WRITE;
168 if (pte_val(pte) & _PAGE_MODIFIED)
169 pte_val(pte) |= _PAGE_SILENT_WRITE;
173 static inline pte_t pte_mkread(pte_t pte)
175 pte_val(pte) |= _PAGE_READ;
176 if (pte_val(pte) & _PAGE_ACCESSED)
177 pte_val(pte) |= _PAGE_SILENT_READ;
181 static inline pte_t pte_mkdirty(pte_t pte)
183 pte_val(pte) |= _PAGE_MODIFIED;
184 if (pte_val(pte) & _PAGE_WRITE)
185 pte_val(pte) |= _PAGE_SILENT_WRITE;
189 static inline pte_t pte_mkyoung(pte_t pte)
191 pte_val(pte) |= _PAGE_ACCESSED;
192 if (pte_val(pte) & _PAGE_READ)
193 pte_val(pte) |= _PAGE_SILENT_READ;
198 * Macro to make mark a page protection value as "uncacheable". Note
199 * that "protection" is really a misnomer here as the protection value
200 * contains the memory attribute bits, dirty bits, and various other
203 #define pgprot_noncached pgprot_noncached
205 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
207 unsigned long prot = pgprot_val(_prot);
209 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
211 return __pgprot(prot);
215 * Conversion functions: convert a page and protection to a page entry,
216 * and a page entry and page directory to the page they refer to.
218 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
220 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
222 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
226 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
228 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
231 static inline void update_mmu_cache(struct vm_area_struct *vma,
232 unsigned long address, pte_t pte)
234 __update_tlb(vma, address, pte);
235 __update_cache(vma, address, pte);
238 #ifndef CONFIG_DISCONTIGMEM
239 #define kern_addr_valid(addr) (1)
242 #include <asm-generic/pgtable.h>
245 * We provide our own get_unmapped area to cope with the virtual aliasing
246 * constraints placed on us by the cache architecture.
248 #define HAVE_ARCH_UNMAPPED_AREA
250 #define io_remap_page_range remap_page_range
253 * No page table caches to initialise
255 #define pgtable_cache_init() do { } while (0)
257 #endif /* _ASM_PGTABLE_H */