1 /* 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 4 * for more details. 5 * 6 * Copyright (C) 2003 Ralf Baechle 7 */ 8 #ifndef _ASM_PGTABLE_H 9 #define _ASM_PGTABLE_H 10 11 #ifdef CONFIG_32BIT 12 #include <asm/pgtable-32.h> 13 #endif 14 #ifdef CONFIG_64BIT 15 #include <asm/pgtable-64.h> 16 #endif 17 18 #include <asm/io.h> 19 #include <asm/pgtable-bits.h> 20 21 struct mm_struct; 22 struct vm_area_struct; 23 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) 37 38 /* 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.. 42 */ 43 44 /* 45 * Dummy values to fill the table in mmap.c 46 * The real values will be generated at runtime 47 */ 48 #define __P000 __pgprot(0) 49 #define __P001 __pgprot(0) 50 #define __P010 __pgprot(0) 51 #define __P011 __pgprot(0) 52 #define __P100 __pgprot(0) 53 #define __P101 __pgprot(0) 54 #define __P110 __pgprot(0) 55 #define __P111 __pgprot(0) 56 57 #define __S000 __pgprot(0) 58 #define __S001 __pgprot(0) 59 #define __S010 __pgprot(0) 60 #define __S011 __pgprot(0) 61 #define __S100 __pgprot(0) 62 #define __S101 __pgprot(0) 63 #define __S110 __pgprot(0) 64 #define __S111 __pgprot(0) 65 66 extern unsigned long _page_cachable_default; 67 68 /* 69 * ZERO_PAGE is a global shared page that is always zero; used 70 * for zero-mapped memory areas etc.. 71 */ 72 73 extern unsigned long empty_zero_page; 74 extern unsigned long zero_page_mask; 75 76 #define ZERO_PAGE(vaddr) \ 77 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 78 79 extern void paging_init(void); 80 81 /* 82 * Conversion functions: convert a page and protection to a page entry, 83 * and a page entry and page directory to the page they refer to. 84 */ 85 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 86 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 87 #define pmd_page_vaddr(pmd) pmd_val(pmd) 88 89 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 90 91 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 92 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 93 94 static inline void set_pte(pte_t *ptep, pte_t pte) 95 { 96 ptep->pte_high = pte.pte_high; 97 smp_wmb(); 98 ptep->pte_low = pte.pte_low; 99 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); 100 101 if (pte.pte_low & _PAGE_GLOBAL) { 102 pte_t *buddy = ptep_buddy(ptep); 103 /* 104 * Make sure the buddy is global too (if it's !none, 105 * it better already be global) 106 */ 107 if (pte_none(*buddy)) { 108 buddy->pte_low |= _PAGE_GLOBAL; 109 buddy->pte_high |= _PAGE_GLOBAL; 110 } 111 } 112 } 113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 114 115 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 116 { 117 pte_t null = __pte(0); 118 119 /* Preserve global status for the pair */ 120 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 121 null.pte_low = null.pte_high = _PAGE_GLOBAL; 122 123 set_pte_at(mm, addr, ptep, null); 124 } 125 #else 126 127 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 128 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 129 130 /* 131 * Certain architectures need to do special things when pte's 132 * within a page table are directly modified. Thus, the following 133 * hook is made available. 134 */ 135 static inline void set_pte(pte_t *ptep, pte_t pteval) 136 { 137 *ptep = pteval; 138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 139 if (pte_val(pteval) & _PAGE_GLOBAL) { 140 pte_t *buddy = ptep_buddy(ptep); 141 /* 142 * Make sure the buddy is global too (if it's !none, 143 * it better already be global) 144 */ 145 if (pte_none(*buddy)) 146 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 147 } 148 #endif 149 } 150 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 151 152 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 153 { 154 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 155 /* Preserve global status for the pair */ 156 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 157 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 158 else 159 #endif 160 set_pte_at(mm, addr, ptep, __pte(0)); 161 } 162 #endif 163 164 /* 165 * (pmds are folded into puds so this doesn't get actually called, 166 * but the define is needed for a generic inline function.) 167 */ 168 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 169 170 #ifdef CONFIG_64BIT 171 /* 172 * (puds are folded into pgds so this doesn't get actually called, 173 * but the define is needed for a generic inline function.) 174 */ 175 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 176 #endif 177 178 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 179 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 180 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 181 182 /* 183 * We used to declare this array with size but gcc 3.3 and older are not able 184 * to find that this expression is a constant, so the size is dropped. 185 */ 186 extern pgd_t swapper_pg_dir[]; 187 188 /* 189 * The following only work if pte_present() is true. 190 * Undefined behaviour if not.. 191 */ 192 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 193 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 194 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 195 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 196 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 197 198 static inline pte_t pte_wrprotect(pte_t pte) 199 { 200 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 201 pte.pte_high &= ~_PAGE_SILENT_WRITE; 202 return pte; 203 } 204 205 static inline pte_t pte_mkclean(pte_t pte) 206 { 207 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 208 pte.pte_high &= ~_PAGE_SILENT_WRITE; 209 return pte; 210 } 211 212 static inline pte_t pte_mkold(pte_t pte) 213 { 214 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 215 pte.pte_high &= ~_PAGE_SILENT_READ; 216 return pte; 217 } 218 219 static inline pte_t pte_mkwrite(pte_t pte) 220 { 221 pte.pte_low |= _PAGE_WRITE; 222 if (pte.pte_low & _PAGE_MODIFIED) { 223 pte.pte_low |= _PAGE_SILENT_WRITE; 224 pte.pte_high |= _PAGE_SILENT_WRITE; 225 } 226 return pte; 227 } 228 229 static inline pte_t pte_mkdirty(pte_t pte) 230 { 231 pte.pte_low |= _PAGE_MODIFIED; 232 if (pte.pte_low & _PAGE_WRITE) { 233 pte.pte_low |= _PAGE_SILENT_WRITE; 234 pte.pte_high |= _PAGE_SILENT_WRITE; 235 } 236 return pte; 237 } 238 239 static inline pte_t pte_mkyoung(pte_t pte) 240 { 241 pte.pte_low |= _PAGE_ACCESSED; 242 if (pte.pte_low & _PAGE_READ) { 243 pte.pte_low |= _PAGE_SILENT_READ; 244 pte.pte_high |= _PAGE_SILENT_READ; 245 } 246 return pte; 247 } 248 #else 249 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 250 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 251 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 252 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 253 254 static inline pte_t pte_wrprotect(pte_t pte) 255 { 256 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 257 return pte; 258 } 259 260 static inline pte_t pte_mkclean(pte_t pte) 261 { 262 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 263 return pte; 264 } 265 266 static inline pte_t pte_mkold(pte_t pte) 267 { 268 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 269 return pte; 270 } 271 272 static inline pte_t pte_mkwrite(pte_t pte) 273 { 274 pte_val(pte) |= _PAGE_WRITE; 275 if (pte_val(pte) & _PAGE_MODIFIED) 276 pte_val(pte) |= _PAGE_SILENT_WRITE; 277 return pte; 278 } 279 280 static inline pte_t pte_mkdirty(pte_t pte) 281 { 282 pte_val(pte) |= _PAGE_MODIFIED; 283 if (pte_val(pte) & _PAGE_WRITE) 284 pte_val(pte) |= _PAGE_SILENT_WRITE; 285 return pte; 286 } 287 288 static inline pte_t pte_mkyoung(pte_t pte) 289 { 290 pte_val(pte) |= _PAGE_ACCESSED; 291 if (pte_val(pte) & _PAGE_READ) 292 pte_val(pte) |= _PAGE_SILENT_READ; 293 return pte; 294 } 295 #endif 296 static inline int pte_special(pte_t pte) { return 0; } 297 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 298 299 /* 300 * Macro to make mark a page protection value as "uncacheable". Note 301 * that "protection" is really a misnomer here as the protection value 302 * contains the memory attribute bits, dirty bits, and various other 303 * bits as well. 304 */ 305 #define pgprot_noncached pgprot_noncached 306 307 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 308 { 309 unsigned long prot = pgprot_val(_prot); 310 311 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 312 313 return __pgprot(prot); 314 } 315 316 /* 317 * Conversion functions: convert a page and protection to a page entry, 318 * and a page entry and page directory to the page they refer to. 319 */ 320 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 321 322 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 323 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 324 { 325 pte.pte_low &= _PAGE_CHG_MASK; 326 pte.pte_high &= ~0x3f; 327 pte.pte_low |= pgprot_val(newprot); 328 pte.pte_high |= pgprot_val(newprot) & 0x3f; 329 return pte; 330 } 331 #else 332 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 333 { 334 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 335 } 336 #endif 337 338 339 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 340 pte_t pte); 341 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 342 pte_t pte); 343 344 static inline void update_mmu_cache(struct vm_area_struct *vma, 345 unsigned long address, pte_t pte) 346 { 347 __update_tlb(vma, address, pte); 348 __update_cache(vma, address, pte); 349 } 350 351 #define kern_addr_valid(addr) (1) 352 353 #ifdef CONFIG_64BIT_PHYS_ADDR 354 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 355 356 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 357 unsigned long vaddr, 358 unsigned long pfn, 359 unsigned long size, 360 pgprot_t prot) 361 { 362 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 363 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 364 } 365 #else 366 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 367 remap_pfn_range(vma, vaddr, pfn, size, prot) 368 #endif 369 370 #include <asm-generic/pgtable.h> 371 372 /* 373 * We provide our own get_unmapped area to cope with the virtual aliasing 374 * constraints placed on us by the cache architecture. 375 */ 376 #define HAVE_ARCH_UNMAPPED_AREA 377 378 /* 379 * No page table caches to initialise 380 */ 381 #define pgtable_cache_init() do { } while (0) 382 383 #endif /* _ASM_PGTABLE_H */ 384
