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 #define is_zero_pfn is_zero_pfn 80 static inline int is_zero_pfn(unsigned long pfn) 81 { 82 extern unsigned long zero_pfn; 83 unsigned long offset_from_zero_pfn = pfn - zero_pfn; 84 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); 85 } 86 87 #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) 88 89 extern void paging_init(void); 90 91 /* 92 * Conversion functions: convert a page and protection to a page entry, 93 * and a page entry and page directory to the page they refer to. 94 */ 95 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 96 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 97 #define pmd_page_vaddr(pmd) pmd_val(pmd) 98 99 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 100 101 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 102 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 103 104 static inline void set_pte(pte_t *ptep, pte_t pte) 105 { 106 ptep->pte_high = pte.pte_high; 107 smp_wmb(); 108 ptep->pte_low = pte.pte_low; 109 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); 110 111 if (pte.pte_low & _PAGE_GLOBAL) { 112 pte_t *buddy = ptep_buddy(ptep); 113 /* 114 * Make sure the buddy is global too (if it's !none, 115 * it better already be global) 116 */ 117 if (pte_none(*buddy)) { 118 buddy->pte_low |= _PAGE_GLOBAL; 119 buddy->pte_high |= _PAGE_GLOBAL; 120 } 121 } 122 } 123 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 124 125 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 126 { 127 pte_t null = __pte(0); 128 129 /* Preserve global status for the pair */ 130 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 131 null.pte_low = null.pte_high = _PAGE_GLOBAL; 132 133 set_pte_at(mm, addr, ptep, null); 134 } 135 #else 136 137 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 138 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 139 140 /* 141 * Certain architectures need to do special things when pte's 142 * within a page table are directly modified. Thus, the following 143 * hook is made available. 144 */ 145 static inline void set_pte(pte_t *ptep, pte_t pteval) 146 { 147 *ptep = pteval; 148 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 149 if (pte_val(pteval) & _PAGE_GLOBAL) { 150 pte_t *buddy = ptep_buddy(ptep); 151 /* 152 * Make sure the buddy is global too (if it's !none, 153 * it better already be global) 154 */ 155 if (pte_none(*buddy)) 156 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 157 } 158 #endif 159 } 160 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 161 162 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 163 { 164 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 165 /* Preserve global status for the pair */ 166 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 167 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 168 else 169 #endif 170 set_pte_at(mm, addr, ptep, __pte(0)); 171 } 172 #endif 173 174 /* 175 * (pmds are folded into puds so this doesn't get actually called, 176 * but the define is needed for a generic inline function.) 177 */ 178 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 179 180 #ifdef CONFIG_64BIT 181 /* 182 * (puds are folded into pgds so this doesn't get actually called, 183 * but the define is needed for a generic inline function.) 184 */ 185 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 186 #endif 187 188 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 189 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 190 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 191 192 /* 193 * We used to declare this array with size but gcc 3.3 and older are not able 194 * to find that this expression is a constant, so the size is dropped. 195 */ 196 extern pgd_t swapper_pg_dir[]; 197 198 /* 199 * The following only work if pte_present() is true. 200 * Undefined behaviour if not.. 201 */ 202 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 203 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 204 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 205 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 206 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 207 208 static inline pte_t pte_wrprotect(pte_t pte) 209 { 210 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 211 pte.pte_high &= ~_PAGE_SILENT_WRITE; 212 return pte; 213 } 214 215 static inline pte_t pte_mkclean(pte_t pte) 216 { 217 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 218 pte.pte_high &= ~_PAGE_SILENT_WRITE; 219 return pte; 220 } 221 222 static inline pte_t pte_mkold(pte_t pte) 223 { 224 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 225 pte.pte_high &= ~_PAGE_SILENT_READ; 226 return pte; 227 } 228 229 static inline pte_t pte_mkwrite(pte_t pte) 230 { 231 pte.pte_low |= _PAGE_WRITE; 232 if (pte.pte_low & _PAGE_MODIFIED) { 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_mkdirty(pte_t pte) 240 { 241 pte.pte_low |= _PAGE_MODIFIED; 242 if (pte.pte_low & _PAGE_WRITE) { 243 pte.pte_low |= _PAGE_SILENT_WRITE; 244 pte.pte_high |= _PAGE_SILENT_WRITE; 245 } 246 return pte; 247 } 248 249 static inline pte_t pte_mkyoung(pte_t pte) 250 { 251 pte.pte_low |= _PAGE_ACCESSED; 252 if (pte.pte_low & _PAGE_READ) { 253 pte.pte_low |= _PAGE_SILENT_READ; 254 pte.pte_high |= _PAGE_SILENT_READ; 255 } 256 return pte; 257 } 258 #else 259 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 260 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 261 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 262 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 263 264 static inline pte_t pte_wrprotect(pte_t pte) 265 { 266 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 267 return pte; 268 } 269 270 static inline pte_t pte_mkclean(pte_t pte) 271 { 272 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 273 return pte; 274 } 275 276 static inline pte_t pte_mkold(pte_t pte) 277 { 278 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 279 return pte; 280 } 281 282 static inline pte_t pte_mkwrite(pte_t pte) 283 { 284 pte_val(pte) |= _PAGE_WRITE; 285 if (pte_val(pte) & _PAGE_MODIFIED) 286 pte_val(pte) |= _PAGE_SILENT_WRITE; 287 return pte; 288 } 289 290 static inline pte_t pte_mkdirty(pte_t pte) 291 { 292 pte_val(pte) |= _PAGE_MODIFIED; 293 if (pte_val(pte) & _PAGE_WRITE) 294 pte_val(pte) |= _PAGE_SILENT_WRITE; 295 return pte; 296 } 297 298 static inline pte_t pte_mkyoung(pte_t pte) 299 { 300 pte_val(pte) |= _PAGE_ACCESSED; 301 if (pte_val(pte) & _PAGE_READ) 302 pte_val(pte) |= _PAGE_SILENT_READ; 303 return pte; 304 } 305 306 #ifdef _PAGE_HUGE 307 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 308 309 static inline pte_t pte_mkhuge(pte_t pte) 310 { 311 pte_val(pte) |= _PAGE_HUGE; 312 return pte; 313 } 314 #endif /* _PAGE_HUGE */ 315 #endif 316 static inline int pte_special(pte_t pte) { return 0; } 317 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 318 319 /* 320 * Macro to make mark a page protection value as "uncacheable". Note 321 * that "protection" is really a misnomer here as the protection value 322 * contains the memory attribute bits, dirty bits, and various other 323 * bits as well. 324 */ 325 #define pgprot_noncached pgprot_noncached 326 327 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 328 { 329 unsigned long prot = pgprot_val(_prot); 330 331 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 332 333 return __pgprot(prot); 334 } 335 336 /* 337 * Conversion functions: convert a page and protection to a page entry, 338 * and a page entry and page directory to the page they refer to. 339 */ 340 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 341 342 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 343 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 344 { 345 pte.pte_low &= _PAGE_CHG_MASK; 346 pte.pte_high &= ~0x3f; 347 pte.pte_low |= pgprot_val(newprot); 348 pte.pte_high |= pgprot_val(newprot) & 0x3f; 349 return pte; 350 } 351 #else 352 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 353 { 354 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 355 } 356 #endif 357 358 359 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 360 pte_t pte); 361 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 362 pte_t pte); 363 364 static inline void update_mmu_cache(struct vm_area_struct *vma, 365 unsigned long address, pte_t pte) 366 { 367 __update_tlb(vma, address, pte); 368 __update_cache(vma, address, pte); 369 } 370 371 #define kern_addr_valid(addr) (1) 372 373 #ifdef CONFIG_64BIT_PHYS_ADDR 374 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 375 376 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 377 unsigned long vaddr, 378 unsigned long pfn, 379 unsigned long size, 380 pgprot_t prot) 381 { 382 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 383 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 384 } 385 #else 386 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 387 remap_pfn_range(vma, vaddr, pfn, size, prot) 388 #endif 389 390 #include <asm-generic/pgtable.h> 391 392 /* 393 * We provide our own get_unmapped area to cope with the virtual aliasing 394 * constraints placed on us by the cache architecture. 395 */ 396 #define HAVE_ARCH_UNMAPPED_AREA 397 398 /* 399 * No page table caches to initialise 400 */ 401 #define pgtable_cache_init() do { } while (0) 402 403 #endif /* _ASM_PGTABLE_H */ 404