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/mm_types.h> 12 #include <linux/mmzone.h> 13 #ifdef CONFIG_32BIT 14 #include <asm/pgtable-32.h> 15 #endif 16 #ifdef CONFIG_64BIT 17 #include <asm/pgtable-64.h> 18 #endif 19 20 #include <asm/io.h> 21 #include <asm/pgtable-bits.h> 22 23 struct mm_struct; 24 struct vm_area_struct; 25 26 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) 27 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \ 28 _page_cachable_default) 29 #define PAGE_COPY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \ 30 (cpu_has_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default) 31 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \ 32 _page_cachable_default) 33 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 34 _PAGE_GLOBAL | _page_cachable_default) 35 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 36 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) 37 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \ 38 _page_cachable_default) 39 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 40 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 41 42 /* 43 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 44 * execute, and consider it to be the same as read. Also, write 45 * permissions imply read permissions. This is the closest we can get 46 * by reasonable means.. 47 */ 48 49 /* 50 * Dummy values to fill the table in mmap.c 51 * The real values will be generated at runtime 52 */ 53 #define __P000 __pgprot(0) 54 #define __P001 __pgprot(0) 55 #define __P010 __pgprot(0) 56 #define __P011 __pgprot(0) 57 #define __P100 __pgprot(0) 58 #define __P101 __pgprot(0) 59 #define __P110 __pgprot(0) 60 #define __P111 __pgprot(0) 61 62 #define __S000 __pgprot(0) 63 #define __S001 __pgprot(0) 64 #define __S010 __pgprot(0) 65 #define __S011 __pgprot(0) 66 #define __S100 __pgprot(0) 67 #define __S101 __pgprot(0) 68 #define __S110 __pgprot(0) 69 #define __S111 __pgprot(0) 70 71 extern unsigned long _page_cachable_default; 72 73 /* 74 * ZERO_PAGE is a global shared page that is always zero; used 75 * for zero-mapped memory areas etc.. 76 */ 77 78 extern unsigned long empty_zero_page; 79 extern unsigned long zero_page_mask; 80 81 #define ZERO_PAGE(vaddr) \ 82 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 83 #define __HAVE_COLOR_ZERO_PAGE 84 85 extern void paging_init(void); 86 87 /* 88 * Conversion functions: convert a page and protection to a page entry, 89 * and a page entry and page directory to the page they refer to. 90 */ 91 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 92 93 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 94 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 95 #define pmd_page(pmd) __pmd_page(pmd) 96 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 97 98 #define pmd_page_vaddr(pmd) pmd_val(pmd) 99 100 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 101 102 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 103 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 104 105 static inline void set_pte(pte_t *ptep, pte_t pte) 106 { 107 ptep->pte_high = pte.pte_high; 108 smp_wmb(); 109 ptep->pte_low = pte.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 #ifndef __PAGETABLE_PMD_FOLDED 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 (cpu_has_rixi) { 302 if (!(pte_val(pte) & _PAGE_NO_READ)) 303 pte_val(pte) |= _PAGE_SILENT_READ; 304 } else { 305 if (pte_val(pte) & _PAGE_READ) 306 pte_val(pte) |= _PAGE_SILENT_READ; 307 } 308 return pte; 309 } 310 311 #ifdef _PAGE_HUGE 312 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 313 314 static inline pte_t pte_mkhuge(pte_t pte) 315 { 316 pte_val(pte) |= _PAGE_HUGE; 317 return pte; 318 } 319 #endif /* _PAGE_HUGE */ 320 #endif 321 static inline int pte_special(pte_t pte) { return 0; } 322 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 323 324 /* 325 * Macro to make mark a page protection value as "uncacheable". Note 326 * that "protection" is really a misnomer here as the protection value 327 * contains the memory attribute bits, dirty bits, and various other 328 * bits as well. 329 */ 330 #define pgprot_noncached pgprot_noncached 331 332 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 333 { 334 unsigned long prot = pgprot_val(_prot); 335 336 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 337 338 return __pgprot(prot); 339 } 340 341 /* 342 * Conversion functions: convert a page and protection to a page entry, 343 * and a page entry and page directory to the page they refer to. 344 */ 345 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 346 347 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 348 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 349 { 350 pte.pte_low &= _PAGE_CHG_MASK; 351 pte.pte_high &= ~0x3f; 352 pte.pte_low |= pgprot_val(newprot); 353 pte.pte_high |= pgprot_val(newprot) & 0x3f; 354 return pte; 355 } 356 #else 357 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 358 { 359 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 360 } 361 #endif 362 363 364 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 365 pte_t pte); 366 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 367 pte_t pte); 368 369 static inline void update_mmu_cache(struct vm_area_struct *vma, 370 unsigned long address, pte_t *ptep) 371 { 372 pte_t pte = *ptep; 373 __update_tlb(vma, address, pte); 374 __update_cache(vma, address, pte); 375 } 376 377 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 378 unsigned long address, pmd_t *pmdp) 379 { 380 pte_t pte = *(pte_t *)pmdp; 381 382 __update_tlb(vma, address, pte); 383 } 384 385 #define kern_addr_valid(addr) (1) 386 387 #ifdef CONFIG_64BIT_PHYS_ADDR 388 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 389 390 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 391 unsigned long vaddr, 392 unsigned long pfn, 393 unsigned long size, 394 pgprot_t prot) 395 { 396 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 397 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 398 } 399 #define io_remap_pfn_range io_remap_pfn_range 400 #endif 401 402 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 403 404 extern int has_transparent_hugepage(void); 405 406 static inline int pmd_trans_huge(pmd_t pmd) 407 { 408 return !!(pmd_val(pmd) & _PAGE_HUGE); 409 } 410 411 static inline pmd_t pmd_mkhuge(pmd_t pmd) 412 { 413 pmd_val(pmd) |= _PAGE_HUGE; 414 415 return pmd; 416 } 417 418 static inline int pmd_trans_splitting(pmd_t pmd) 419 { 420 return !!(pmd_val(pmd) & _PAGE_SPLITTING); 421 } 422 423 static inline pmd_t pmd_mksplitting(pmd_t pmd) 424 { 425 pmd_val(pmd) |= _PAGE_SPLITTING; 426 427 return pmd; 428 } 429 430 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 431 pmd_t *pmdp, pmd_t pmd); 432 433 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 434 /* Extern to avoid header file madness */ 435 extern void pmdp_splitting_flush(struct vm_area_struct *vma, 436 unsigned long address, 437 pmd_t *pmdp); 438 439 #define __HAVE_ARCH_PMD_WRITE 440 static inline int pmd_write(pmd_t pmd) 441 { 442 return !!(pmd_val(pmd) & _PAGE_WRITE); 443 } 444 445 static inline pmd_t pmd_wrprotect(pmd_t pmd) 446 { 447 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 448 return pmd; 449 } 450 451 static inline pmd_t pmd_mkwrite(pmd_t pmd) 452 { 453 pmd_val(pmd) |= _PAGE_WRITE; 454 if (pmd_val(pmd) & _PAGE_MODIFIED) 455 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 456 457 return pmd; 458 } 459 460 static inline int pmd_dirty(pmd_t pmd) 461 { 462 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 463 } 464 465 static inline pmd_t pmd_mkclean(pmd_t pmd) 466 { 467 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 468 return pmd; 469 } 470 471 static inline pmd_t pmd_mkdirty(pmd_t pmd) 472 { 473 pmd_val(pmd) |= _PAGE_MODIFIED; 474 if (pmd_val(pmd) & _PAGE_WRITE) 475 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 476 477 return pmd; 478 } 479 480 static inline int pmd_young(pmd_t pmd) 481 { 482 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 483 } 484 485 static inline pmd_t pmd_mkold(pmd_t pmd) 486 { 487 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 488 489 return pmd; 490 } 491 492 static inline pmd_t pmd_mkyoung(pmd_t pmd) 493 { 494 pmd_val(pmd) |= _PAGE_ACCESSED; 495 496 if (cpu_has_rixi) { 497 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 498 pmd_val(pmd) |= _PAGE_SILENT_READ; 499 } else { 500 if (pmd_val(pmd) & _PAGE_READ) 501 pmd_val(pmd) |= _PAGE_SILENT_READ; 502 } 503 504 return pmd; 505 } 506 507 /* Extern to avoid header file madness */ 508 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 509 510 static inline unsigned long pmd_pfn(pmd_t pmd) 511 { 512 return pmd_val(pmd) >> _PFN_SHIFT; 513 } 514 515 static inline struct page *pmd_page(pmd_t pmd) 516 { 517 if (pmd_trans_huge(pmd)) 518 return pfn_to_page(pmd_pfn(pmd)); 519 520 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 521 } 522 523 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 524 { 525 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); 526 return pmd; 527 } 528 529 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 530 { 531 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 532 533 return pmd; 534 } 535 536 /* 537 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a 538 * different prototype. 539 */ 540 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR 541 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, 542 unsigned long address, pmd_t *pmdp) 543 { 544 pmd_t old = *pmdp; 545 546 pmd_clear(pmdp); 547 548 return old; 549 } 550 551 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 552 553 #include <asm-generic/pgtable.h> 554 555 /* 556 * uncached accelerated TLB map for video memory access 557 */ 558 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 559 #define __HAVE_PHYS_MEM_ACCESS_PROT 560 561 struct file; 562 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 563 unsigned long size, pgprot_t vma_prot); 564 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 565 unsigned long size, pgprot_t *vma_prot); 566 #endif 567 568 /* 569 * We provide our own get_unmapped area to cope with the virtual aliasing 570 * constraints placed on us by the cache architecture. 571 */ 572 #define HAVE_ARCH_UNMAPPED_AREA 573 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 574 575 /* 576 * No page table caches to initialise 577 */ 578 #define pgtable_cache_init() do { } while (0) 579 580 #endif /* _ASM_PGTABLE_H */ 581