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 #include <linux/mmzone.h> 12 #ifdef CONFIG_32BIT 13 #include <asm/pgtable-32.h> 14 #endif 15 #ifdef CONFIG_64BIT 16 #include <asm/pgtable-64.h> 17 #endif 18 19 #include <asm/io.h> 20 #include <asm/pgtable-bits.h> 21 22 struct mm_struct; 23 struct vm_area_struct; 24 25 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) 26 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \ 27 _page_cachable_default) 28 #define PAGE_COPY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \ 29 (cpu_has_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default) 30 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _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 | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \ 35 _page_cachable_default) 36 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 37 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 38 39 /* 40 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 41 * execute, and consider it to be the same as read. Also, write 42 * permissions imply read permissions. This is the closest we can get 43 * by reasonable means.. 44 */ 45 46 /* 47 * Dummy values to fill the table in mmap.c 48 * The real values will be generated at runtime 49 */ 50 #define __P000 __pgprot(0) 51 #define __P001 __pgprot(0) 52 #define __P010 __pgprot(0) 53 #define __P011 __pgprot(0) 54 #define __P100 __pgprot(0) 55 #define __P101 __pgprot(0) 56 #define __P110 __pgprot(0) 57 #define __P111 __pgprot(0) 58 59 #define __S000 __pgprot(0) 60 #define __S001 __pgprot(0) 61 #define __S010 __pgprot(0) 62 #define __S011 __pgprot(0) 63 #define __S100 __pgprot(0) 64 #define __S101 __pgprot(0) 65 #define __S110 __pgprot(0) 66 #define __S111 __pgprot(0) 67 68 extern unsigned long _page_cachable_default; 69 70 /* 71 * ZERO_PAGE is a global shared page that is always zero; used 72 * for zero-mapped memory areas etc.. 73 */ 74 75 extern unsigned long empty_zero_page; 76 extern unsigned long zero_page_mask; 77 78 #define ZERO_PAGE(vaddr) \ 79 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 80 #define __HAVE_COLOR_ZERO_PAGE 81 82 extern void paging_init(void); 83 84 /* 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. 87 */ 88 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 89 90 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 91 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 92 #define pmd_page(pmd) __pmd_page(pmd) 93 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 94 95 #define pmd_page_vaddr(pmd) pmd_val(pmd) 96 97 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 98 99 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 100 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 101 102 static inline void set_pte(pte_t *ptep, pte_t pte) 103 { 104 ptep->pte_high = pte.pte_high; 105 smp_wmb(); 106 ptep->pte_low = pte.pte_low; 107 108 if (pte.pte_low & _PAGE_GLOBAL) { 109 pte_t *buddy = ptep_buddy(ptep); 110 /* 111 * Make sure the buddy is global too (if it's !none, 112 * it better already be global) 113 */ 114 if (pte_none(*buddy)) { 115 buddy->pte_low |= _PAGE_GLOBAL; 116 buddy->pte_high |= _PAGE_GLOBAL; 117 } 118 } 119 } 120 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 121 122 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 123 { 124 pte_t null = __pte(0); 125 126 /* Preserve global status for the pair */ 127 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 128 null.pte_low = null.pte_high = _PAGE_GLOBAL; 129 130 set_pte_at(mm, addr, ptep, null); 131 } 132 #else 133 134 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 135 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 136 137 /* 138 * Certain architectures need to do special things when pte's 139 * within a page table are directly modified. Thus, the following 140 * hook is made available. 141 */ 142 static inline void set_pte(pte_t *ptep, pte_t pteval) 143 { 144 *ptep = pteval; 145 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 146 if (pte_val(pteval) & _PAGE_GLOBAL) { 147 pte_t *buddy = ptep_buddy(ptep); 148 /* 149 * Make sure the buddy is global too (if it's !none, 150 * it better already be global) 151 */ 152 if (pte_none(*buddy)) 153 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 154 } 155 #endif 156 } 157 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 158 159 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 160 { 161 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 162 /* Preserve global status for the pair */ 163 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 164 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 165 else 166 #endif 167 set_pte_at(mm, addr, ptep, __pte(0)); 168 } 169 #endif 170 171 /* 172 * (pmds are folded into puds so this doesn't get actually called, 173 * but the define is needed for a generic inline function.) 174 */ 175 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 176 177 #ifndef __PAGETABLE_PMD_FOLDED 178 /* 179 * (puds are folded into pgds so this doesn't get actually called, 180 * but the define is needed for a generic inline function.) 181 */ 182 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 183 #endif 184 185 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 186 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 187 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 188 189 /* 190 * We used to declare this array with size but gcc 3.3 and older are not able 191 * to find that this expression is a constant, so the size is dropped. 192 */ 193 extern pgd_t swapper_pg_dir[]; 194 195 /* 196 * The following only work if pte_present() is true. 197 * Undefined behaviour if not.. 198 */ 199 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 200 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 201 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 202 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 203 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 204 205 static inline pte_t pte_wrprotect(pte_t pte) 206 { 207 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 208 pte.pte_high &= ~_PAGE_SILENT_WRITE; 209 return pte; 210 } 211 212 static inline pte_t pte_mkclean(pte_t pte) 213 { 214 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 215 pte.pte_high &= ~_PAGE_SILENT_WRITE; 216 return pte; 217 } 218 219 static inline pte_t pte_mkold(pte_t pte) 220 { 221 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 222 pte.pte_high &= ~_PAGE_SILENT_READ; 223 return pte; 224 } 225 226 static inline pte_t pte_mkwrite(pte_t pte) 227 { 228 pte.pte_low |= _PAGE_WRITE; 229 if (pte.pte_low & _PAGE_MODIFIED) { 230 pte.pte_low |= _PAGE_SILENT_WRITE; 231 pte.pte_high |= _PAGE_SILENT_WRITE; 232 } 233 return pte; 234 } 235 236 static inline pte_t pte_mkdirty(pte_t pte) 237 { 238 pte.pte_low |= _PAGE_MODIFIED; 239 if (pte.pte_low & _PAGE_WRITE) { 240 pte.pte_low |= _PAGE_SILENT_WRITE; 241 pte.pte_high |= _PAGE_SILENT_WRITE; 242 } 243 return pte; 244 } 245 246 static inline pte_t pte_mkyoung(pte_t pte) 247 { 248 pte.pte_low |= _PAGE_ACCESSED; 249 if (pte.pte_low & _PAGE_READ) { 250 pte.pte_low |= _PAGE_SILENT_READ; 251 pte.pte_high |= _PAGE_SILENT_READ; 252 } 253 return pte; 254 } 255 #else 256 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 257 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 258 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 259 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 260 261 static inline pte_t pte_wrprotect(pte_t pte) 262 { 263 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 264 return pte; 265 } 266 267 static inline pte_t pte_mkclean(pte_t pte) 268 { 269 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 270 return pte; 271 } 272 273 static inline pte_t pte_mkold(pte_t pte) 274 { 275 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 276 return pte; 277 } 278 279 static inline pte_t pte_mkwrite(pte_t pte) 280 { 281 pte_val(pte) |= _PAGE_WRITE; 282 if (pte_val(pte) & _PAGE_MODIFIED) 283 pte_val(pte) |= _PAGE_SILENT_WRITE; 284 return pte; 285 } 286 287 static inline pte_t pte_mkdirty(pte_t pte) 288 { 289 pte_val(pte) |= _PAGE_MODIFIED; 290 if (pte_val(pte) & _PAGE_WRITE) 291 pte_val(pte) |= _PAGE_SILENT_WRITE; 292 return pte; 293 } 294 295 static inline pte_t pte_mkyoung(pte_t pte) 296 { 297 pte_val(pte) |= _PAGE_ACCESSED; 298 if (cpu_has_rixi) { 299 if (!(pte_val(pte) & _PAGE_NO_READ)) 300 pte_val(pte) |= _PAGE_SILENT_READ; 301 } else { 302 if (pte_val(pte) & _PAGE_READ) 303 pte_val(pte) |= _PAGE_SILENT_READ; 304 } 305 return pte; 306 } 307 308 #ifdef _PAGE_HUGE 309 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 310 311 static inline pte_t pte_mkhuge(pte_t pte) 312 { 313 pte_val(pte) |= _PAGE_HUGE; 314 return pte; 315 } 316 #endif /* _PAGE_HUGE */ 317 #endif 318 static inline int pte_special(pte_t pte) { return 0; } 319 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 320 321 /* 322 * Macro to make mark a page protection value as "uncacheable". Note 323 * that "protection" is really a misnomer here as the protection value 324 * contains the memory attribute bits, dirty bits, and various other 325 * bits as well. 326 */ 327 #define pgprot_noncached pgprot_noncached 328 329 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 330 { 331 unsigned long prot = pgprot_val(_prot); 332 333 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 334 335 return __pgprot(prot); 336 } 337 338 /* 339 * Conversion functions: convert a page and protection to a page entry, 340 * and a page entry and page directory to the page they refer to. 341 */ 342 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 343 344 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 345 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 346 { 347 pte.pte_low &= _PAGE_CHG_MASK; 348 pte.pte_high &= ~0x3f; 349 pte.pte_low |= pgprot_val(newprot); 350 pte.pte_high |= pgprot_val(newprot) & 0x3f; 351 return pte; 352 } 353 #else 354 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 355 { 356 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 357 } 358 #endif 359 360 361 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 362 pte_t pte); 363 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 364 pte_t pte); 365 366 static inline void update_mmu_cache(struct vm_area_struct *vma, 367 unsigned long address, pte_t *ptep) 368 { 369 pte_t pte = *ptep; 370 __update_tlb(vma, address, pte); 371 __update_cache(vma, address, pte); 372 } 373 374 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 375 unsigned long address, pmd_t *pmdp) 376 { 377 pte_t pte = *(pte_t *)pmdp; 378 379 __update_tlb(vma, address, pte); 380 } 381 382 #define kern_addr_valid(addr) (1) 383 384 #ifdef CONFIG_64BIT_PHYS_ADDR 385 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 386 387 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 388 unsigned long vaddr, 389 unsigned long pfn, 390 unsigned long size, 391 pgprot_t prot) 392 { 393 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 394 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 395 } 396 #else 397 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 398 remap_pfn_range(vma, vaddr, pfn, size, prot) 399 #endif 400 401 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 402 403 extern int has_transparent_hugepage(void); 404 405 static inline int pmd_trans_huge(pmd_t pmd) 406 { 407 return !!(pmd_val(pmd) & _PAGE_HUGE); 408 } 409 410 static inline pmd_t pmd_mkhuge(pmd_t pmd) 411 { 412 pmd_val(pmd) |= _PAGE_HUGE; 413 414 return pmd; 415 } 416 417 static inline int pmd_trans_splitting(pmd_t pmd) 418 { 419 return !!(pmd_val(pmd) & _PAGE_SPLITTING); 420 } 421 422 static inline pmd_t pmd_mksplitting(pmd_t pmd) 423 { 424 pmd_val(pmd) |= _PAGE_SPLITTING; 425 426 return pmd; 427 } 428 429 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 430 pmd_t *pmdp, pmd_t pmd); 431 432 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 433 /* Extern to avoid header file madness */ 434 extern void pmdp_splitting_flush(struct vm_area_struct *vma, 435 unsigned long address, 436 pmd_t *pmdp); 437 438 #define __HAVE_ARCH_PMD_WRITE 439 static inline int pmd_write(pmd_t pmd) 440 { 441 return !!(pmd_val(pmd) & _PAGE_WRITE); 442 } 443 444 static inline pmd_t pmd_wrprotect(pmd_t pmd) 445 { 446 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 447 return pmd; 448 } 449 450 static inline pmd_t pmd_mkwrite(pmd_t pmd) 451 { 452 pmd_val(pmd) |= _PAGE_WRITE; 453 if (pmd_val(pmd) & _PAGE_MODIFIED) 454 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 455 456 return pmd; 457 } 458 459 static inline int pmd_dirty(pmd_t pmd) 460 { 461 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 462 } 463 464 static inline pmd_t pmd_mkclean(pmd_t pmd) 465 { 466 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 467 return pmd; 468 } 469 470 static inline pmd_t pmd_mkdirty(pmd_t pmd) 471 { 472 pmd_val(pmd) |= _PAGE_MODIFIED; 473 if (pmd_val(pmd) & _PAGE_WRITE) 474 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 475 476 return pmd; 477 } 478 479 static inline int pmd_young(pmd_t pmd) 480 { 481 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 482 } 483 484 static inline pmd_t pmd_mkold(pmd_t pmd) 485 { 486 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 487 488 return pmd; 489 } 490 491 static inline pmd_t pmd_mkyoung(pmd_t pmd) 492 { 493 pmd_val(pmd) |= _PAGE_ACCESSED; 494 495 if (cpu_has_rixi) { 496 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 497 pmd_val(pmd) |= _PAGE_SILENT_READ; 498 } else { 499 if (pmd_val(pmd) & _PAGE_READ) 500 pmd_val(pmd) |= _PAGE_SILENT_READ; 501 } 502 503 return pmd; 504 } 505 506 /* Extern to avoid header file madness */ 507 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 508 509 static inline unsigned long pmd_pfn(pmd_t pmd) 510 { 511 return pmd_val(pmd) >> _PFN_SHIFT; 512 } 513 514 static inline struct page *pmd_page(pmd_t pmd) 515 { 516 if (pmd_trans_huge(pmd)) 517 return pfn_to_page(pmd_pfn(pmd)); 518 519 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 520 } 521 522 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 523 { 524 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); 525 return pmd; 526 } 527 528 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 529 { 530 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 531 532 return pmd; 533 } 534 535 /* 536 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a 537 * different prototype. 538 */ 539 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR 540 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, 541 unsigned long address, pmd_t *pmdp) 542 { 543 pmd_t old = *pmdp; 544 545 pmd_clear(pmdp); 546 547 return old; 548 } 549 550 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 551 552 #include <asm-generic/pgtable.h> 553 554 /* 555 * uncached accelerated TLB map for video memory access 556 */ 557 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 558 #define __HAVE_PHYS_MEM_ACCESS_PROT 559 560 struct file; 561 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 562 unsigned long size, pgprot_t vma_prot); 563 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 564 unsigned long size, pgprot_t *vma_prot); 565 #endif 566 567 /* 568 * We provide our own get_unmapped area to cope with the virtual aliasing 569 * constraints placed on us by the cache architecture. 570 */ 571 #define HAVE_ARCH_UNMAPPED_AREA 572 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 573 574 /* 575 * No page table caches to initialise 576 */ 577 #define pgtable_cache_init() do { } while (0) 578 579 #endif /* _ASM_PGTABLE_H */ 580