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_USERIO __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \ 36 _page_cachable_default) 37 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 38 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 39 40 /* 41 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 42 * execute, and consider it to be the same as read. Also, write 43 * permissions imply read permissions. This is the closest we can get 44 * by reasonable means.. 45 */ 46 47 /* 48 * Dummy values to fill the table in mmap.c 49 * The real values will be generated at runtime 50 */ 51 #define __P000 __pgprot(0) 52 #define __P001 __pgprot(0) 53 #define __P010 __pgprot(0) 54 #define __P011 __pgprot(0) 55 #define __P100 __pgprot(0) 56 #define __P101 __pgprot(0) 57 #define __P110 __pgprot(0) 58 #define __P111 __pgprot(0) 59 60 #define __S000 __pgprot(0) 61 #define __S001 __pgprot(0) 62 #define __S010 __pgprot(0) 63 #define __S011 __pgprot(0) 64 #define __S100 __pgprot(0) 65 #define __S101 __pgprot(0) 66 #define __S110 __pgprot(0) 67 #define __S111 __pgprot(0) 68 69 extern unsigned long _page_cachable_default; 70 71 /* 72 * ZERO_PAGE is a global shared page that is always zero; used 73 * for zero-mapped memory areas etc.. 74 */ 75 76 extern unsigned long empty_zero_page; 77 extern unsigned long zero_page_mask; 78 79 #define ZERO_PAGE(vaddr) \ 80 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 81 #define __HAVE_COLOR_ZERO_PAGE 82 83 extern void paging_init(void); 84 85 /* 86 * Conversion functions: convert a page and protection to a page entry, 87 * and a page entry and page directory to the page they refer to. 88 */ 89 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 90 91 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 92 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 93 #define pmd_page(pmd) __pmd_page(pmd) 94 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 95 96 #define pmd_page_vaddr(pmd) pmd_val(pmd) 97 98 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 99 100 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 101 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 102 103 static inline void set_pte(pte_t *ptep, pte_t pte) 104 { 105 ptep->pte_high = pte.pte_high; 106 smp_wmb(); 107 ptep->pte_low = pte.pte_low; 108 109 if (pte.pte_low & _PAGE_GLOBAL) { 110 pte_t *buddy = ptep_buddy(ptep); 111 /* 112 * Make sure the buddy is global too (if it's !none, 113 * it better already be global) 114 */ 115 if (pte_none(*buddy)) { 116 buddy->pte_low |= _PAGE_GLOBAL; 117 buddy->pte_high |= _PAGE_GLOBAL; 118 } 119 } 120 } 121 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 122 123 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 124 { 125 pte_t null = __pte(0); 126 127 /* Preserve global status for the pair */ 128 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 129 null.pte_low = null.pte_high = _PAGE_GLOBAL; 130 131 set_pte_at(mm, addr, ptep, null); 132 } 133 #else 134 135 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 136 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 137 138 /* 139 * Certain architectures need to do special things when pte's 140 * within a page table are directly modified. Thus, the following 141 * hook is made available. 142 */ 143 static inline void set_pte(pte_t *ptep, pte_t pteval) 144 { 145 *ptep = pteval; 146 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 147 if (pte_val(pteval) & _PAGE_GLOBAL) { 148 pte_t *buddy = ptep_buddy(ptep); 149 /* 150 * Make sure the buddy is global too (if it's !none, 151 * it better already be global) 152 */ 153 if (pte_none(*buddy)) 154 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 155 } 156 #endif 157 } 158 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 159 160 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 161 { 162 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 163 /* Preserve global status for the pair */ 164 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 165 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 166 else 167 #endif 168 set_pte_at(mm, addr, ptep, __pte(0)); 169 } 170 #endif 171 172 /* 173 * (pmds are folded into puds so this doesn't get actually called, 174 * but the define is needed for a generic inline function.) 175 */ 176 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 177 178 #ifndef __PAGETABLE_PMD_FOLDED 179 /* 180 * (puds are folded into pgds so this doesn't get actually called, 181 * but the define is needed for a generic inline function.) 182 */ 183 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 184 #endif 185 186 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 187 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 188 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 189 190 /* 191 * We used to declare this array with size but gcc 3.3 and older are not able 192 * to find that this expression is a constant, so the size is dropped. 193 */ 194 extern pgd_t swapper_pg_dir[]; 195 196 /* 197 * The following only work if pte_present() is true. 198 * Undefined behaviour if not.. 199 */ 200 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 201 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 202 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 203 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 204 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 205 206 static inline pte_t pte_wrprotect(pte_t pte) 207 { 208 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 209 pte.pte_high &= ~_PAGE_SILENT_WRITE; 210 return pte; 211 } 212 213 static inline pte_t pte_mkclean(pte_t pte) 214 { 215 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 216 pte.pte_high &= ~_PAGE_SILENT_WRITE; 217 return pte; 218 } 219 220 static inline pte_t pte_mkold(pte_t pte) 221 { 222 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 223 pte.pte_high &= ~_PAGE_SILENT_READ; 224 return pte; 225 } 226 227 static inline pte_t pte_mkwrite(pte_t pte) 228 { 229 pte.pte_low |= _PAGE_WRITE; 230 if (pte.pte_low & _PAGE_MODIFIED) { 231 pte.pte_low |= _PAGE_SILENT_WRITE; 232 pte.pte_high |= _PAGE_SILENT_WRITE; 233 } 234 return pte; 235 } 236 237 static inline pte_t pte_mkdirty(pte_t pte) 238 { 239 pte.pte_low |= _PAGE_MODIFIED; 240 if (pte.pte_low & _PAGE_WRITE) { 241 pte.pte_low |= _PAGE_SILENT_WRITE; 242 pte.pte_high |= _PAGE_SILENT_WRITE; 243 } 244 return pte; 245 } 246 247 static inline pte_t pte_mkyoung(pte_t pte) 248 { 249 pte.pte_low |= _PAGE_ACCESSED; 250 if (pte.pte_low & _PAGE_READ) { 251 pte.pte_low |= _PAGE_SILENT_READ; 252 pte.pte_high |= _PAGE_SILENT_READ; 253 } 254 return pte; 255 } 256 #else 257 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 258 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 259 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 260 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 261 262 static inline pte_t pte_wrprotect(pte_t pte) 263 { 264 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 265 return pte; 266 } 267 268 static inline pte_t pte_mkclean(pte_t pte) 269 { 270 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 271 return pte; 272 } 273 274 static inline pte_t pte_mkold(pte_t pte) 275 { 276 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 277 return pte; 278 } 279 280 static inline pte_t pte_mkwrite(pte_t pte) 281 { 282 pte_val(pte) |= _PAGE_WRITE; 283 if (pte_val(pte) & _PAGE_MODIFIED) 284 pte_val(pte) |= _PAGE_SILENT_WRITE; 285 return pte; 286 } 287 288 static inline pte_t pte_mkdirty(pte_t pte) 289 { 290 pte_val(pte) |= _PAGE_MODIFIED; 291 if (pte_val(pte) & _PAGE_WRITE) 292 pte_val(pte) |= _PAGE_SILENT_WRITE; 293 return pte; 294 } 295 296 static inline pte_t pte_mkyoung(pte_t pte) 297 { 298 pte_val(pte) |= _PAGE_ACCESSED; 299 if (cpu_has_rixi) { 300 if (!(pte_val(pte) & _PAGE_NO_READ)) 301 pte_val(pte) |= _PAGE_SILENT_READ; 302 } else { 303 if (pte_val(pte) & _PAGE_READ) 304 pte_val(pte) |= _PAGE_SILENT_READ; 305 } 306 return pte; 307 } 308 309 #ifdef _PAGE_HUGE 310 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 311 312 static inline pte_t pte_mkhuge(pte_t pte) 313 { 314 pte_val(pte) |= _PAGE_HUGE; 315 return pte; 316 } 317 #endif /* _PAGE_HUGE */ 318 #endif 319 static inline int pte_special(pte_t pte) { return 0; } 320 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 321 322 /* 323 * Macro to make mark a page protection value as "uncacheable". Note 324 * that "protection" is really a misnomer here as the protection value 325 * contains the memory attribute bits, dirty bits, and various other 326 * bits as well. 327 */ 328 #define pgprot_noncached pgprot_noncached 329 330 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 331 { 332 unsigned long prot = pgprot_val(_prot); 333 334 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 335 336 return __pgprot(prot); 337 } 338 339 /* 340 * Conversion functions: convert a page and protection to a page entry, 341 * and a page entry and page directory to the page they refer to. 342 */ 343 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 344 345 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 346 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 347 { 348 pte.pte_low &= _PAGE_CHG_MASK; 349 pte.pte_high &= ~0x3f; 350 pte.pte_low |= pgprot_val(newprot); 351 pte.pte_high |= pgprot_val(newprot) & 0x3f; 352 return pte; 353 } 354 #else 355 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 356 { 357 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 358 } 359 #endif 360 361 362 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 363 pte_t pte); 364 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 365 pte_t pte); 366 367 static inline void update_mmu_cache(struct vm_area_struct *vma, 368 unsigned long address, pte_t *ptep) 369 { 370 pte_t pte = *ptep; 371 __update_tlb(vma, address, pte); 372 __update_cache(vma, address, pte); 373 } 374 375 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 376 unsigned long address, pmd_t *pmdp) 377 { 378 pte_t pte = *(pte_t *)pmdp; 379 380 __update_tlb(vma, address, pte); 381 } 382 383 #define kern_addr_valid(addr) (1) 384 385 #ifdef CONFIG_64BIT_PHYS_ADDR 386 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 387 388 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 389 unsigned long vaddr, 390 unsigned long pfn, 391 unsigned long size, 392 pgprot_t prot) 393 { 394 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 395 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 396 } 397 #else 398 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 399 remap_pfn_range(vma, vaddr, pfn, size, prot) 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