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 #define htw_stop() \ 101 do { \ 102 if (cpu_has_htw) \ 103 write_c0_pwctl(read_c0_pwctl() & \ 104 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \ 105 } while(0) 106 107 #define htw_start() \ 108 do { \ 109 if (cpu_has_htw) \ 110 write_c0_pwctl(read_c0_pwctl() | \ 111 (1 << MIPS_PWCTL_PWEN_SHIFT)); \ 112 } while(0) 113 114 115 #define htw_reset() \ 116 do { \ 117 if (cpu_has_htw) { \ 118 htw_stop(); \ 119 back_to_back_c0_hazard(); \ 120 htw_start(); \ 121 back_to_back_c0_hazard(); \ 122 } \ 123 } while(0) 124 125 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 126 127 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 128 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 129 130 static inline void set_pte(pte_t *ptep, pte_t pte) 131 { 132 ptep->pte_high = pte.pte_high; 133 smp_wmb(); 134 ptep->pte_low = pte.pte_low; 135 136 if (pte.pte_low & _PAGE_GLOBAL) { 137 pte_t *buddy = ptep_buddy(ptep); 138 /* 139 * Make sure the buddy is global too (if it's !none, 140 * it better already be global) 141 */ 142 if (pte_none(*buddy)) { 143 buddy->pte_low |= _PAGE_GLOBAL; 144 buddy->pte_high |= _PAGE_GLOBAL; 145 } 146 } 147 } 148 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 149 150 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 151 { 152 pte_t null = __pte(0); 153 154 /* Preserve global status for the pair */ 155 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 156 null.pte_low = null.pte_high = _PAGE_GLOBAL; 157 158 set_pte_at(mm, addr, ptep, null); 159 htw_reset(); 160 } 161 #else 162 163 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 164 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 165 166 /* 167 * Certain architectures need to do special things when pte's 168 * within a page table are directly modified. Thus, the following 169 * hook is made available. 170 */ 171 static inline void set_pte(pte_t *ptep, pte_t pteval) 172 { 173 *ptep = pteval; 174 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 175 if (pte_val(pteval) & _PAGE_GLOBAL) { 176 pte_t *buddy = ptep_buddy(ptep); 177 /* 178 * Make sure the buddy is global too (if it's !none, 179 * it better already be global) 180 */ 181 if (pte_none(*buddy)) 182 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 183 } 184 #endif 185 } 186 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 187 188 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 189 { 190 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 191 /* Preserve global status for the pair */ 192 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 193 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 194 else 195 #endif 196 set_pte_at(mm, addr, ptep, __pte(0)); 197 htw_reset(); 198 } 199 #endif 200 201 /* 202 * (pmds are folded into puds so this doesn't get actually called, 203 * but the define is needed for a generic inline function.) 204 */ 205 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 206 207 #ifndef __PAGETABLE_PMD_FOLDED 208 /* 209 * (puds are folded into pgds so this doesn't get actually called, 210 * but the define is needed for a generic inline function.) 211 */ 212 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 213 #endif 214 215 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 216 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 217 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 218 219 /* 220 * We used to declare this array with size but gcc 3.3 and older are not able 221 * to find that this expression is a constant, so the size is dropped. 222 */ 223 extern pgd_t swapper_pg_dir[]; 224 225 /* 226 * The following only work if pte_present() is true. 227 * Undefined behaviour if not.. 228 */ 229 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 230 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 231 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 232 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 233 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 234 235 static inline pte_t pte_wrprotect(pte_t pte) 236 { 237 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 238 pte.pte_high &= ~_PAGE_SILENT_WRITE; 239 return pte; 240 } 241 242 static inline pte_t pte_mkclean(pte_t pte) 243 { 244 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 245 pte.pte_high &= ~_PAGE_SILENT_WRITE; 246 return pte; 247 } 248 249 static inline pte_t pte_mkold(pte_t pte) 250 { 251 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 252 pte.pte_high &= ~_PAGE_SILENT_READ; 253 return pte; 254 } 255 256 static inline pte_t pte_mkwrite(pte_t pte) 257 { 258 pte.pte_low |= _PAGE_WRITE; 259 if (pte.pte_low & _PAGE_MODIFIED) { 260 pte.pte_low |= _PAGE_SILENT_WRITE; 261 pte.pte_high |= _PAGE_SILENT_WRITE; 262 } 263 return pte; 264 } 265 266 static inline pte_t pte_mkdirty(pte_t pte) 267 { 268 pte.pte_low |= _PAGE_MODIFIED; 269 if (pte.pte_low & _PAGE_WRITE) { 270 pte.pte_low |= _PAGE_SILENT_WRITE; 271 pte.pte_high |= _PAGE_SILENT_WRITE; 272 } 273 return pte; 274 } 275 276 static inline pte_t pte_mkyoung(pte_t pte) 277 { 278 pte.pte_low |= _PAGE_ACCESSED; 279 if (pte.pte_low & _PAGE_READ) { 280 pte.pte_low |= _PAGE_SILENT_READ; 281 pte.pte_high |= _PAGE_SILENT_READ; 282 } 283 return pte; 284 } 285 #else 286 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 287 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 288 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 289 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 290 291 static inline pte_t pte_wrprotect(pte_t pte) 292 { 293 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 294 return pte; 295 } 296 297 static inline pte_t pte_mkclean(pte_t pte) 298 { 299 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 300 return pte; 301 } 302 303 static inline pte_t pte_mkold(pte_t pte) 304 { 305 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 306 return pte; 307 } 308 309 static inline pte_t pte_mkwrite(pte_t pte) 310 { 311 pte_val(pte) |= _PAGE_WRITE; 312 if (pte_val(pte) & _PAGE_MODIFIED) 313 pte_val(pte) |= _PAGE_SILENT_WRITE; 314 return pte; 315 } 316 317 static inline pte_t pte_mkdirty(pte_t pte) 318 { 319 pte_val(pte) |= _PAGE_MODIFIED; 320 if (pte_val(pte) & _PAGE_WRITE) 321 pte_val(pte) |= _PAGE_SILENT_WRITE; 322 return pte; 323 } 324 325 static inline pte_t pte_mkyoung(pte_t pte) 326 { 327 pte_val(pte) |= _PAGE_ACCESSED; 328 if (cpu_has_rixi) { 329 if (!(pte_val(pte) & _PAGE_NO_READ)) 330 pte_val(pte) |= _PAGE_SILENT_READ; 331 } else { 332 if (pte_val(pte) & _PAGE_READ) 333 pte_val(pte) |= _PAGE_SILENT_READ; 334 } 335 return pte; 336 } 337 338 #ifdef _PAGE_HUGE 339 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 340 341 static inline pte_t pte_mkhuge(pte_t pte) 342 { 343 pte_val(pte) |= _PAGE_HUGE; 344 return pte; 345 } 346 #endif /* _PAGE_HUGE */ 347 #endif 348 static inline int pte_special(pte_t pte) { return 0; } 349 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 350 351 /* 352 * Macro to make mark a page protection value as "uncacheable". Note 353 * that "protection" is really a misnomer here as the protection value 354 * contains the memory attribute bits, dirty bits, and various other 355 * bits as well. 356 */ 357 #define pgprot_noncached pgprot_noncached 358 359 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 360 { 361 unsigned long prot = pgprot_val(_prot); 362 363 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 364 365 return __pgprot(prot); 366 } 367 368 /* 369 * Conversion functions: convert a page and protection to a page entry, 370 * and a page entry and page directory to the page they refer to. 371 */ 372 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 373 374 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 375 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 376 { 377 pte.pte_low &= _PAGE_CHG_MASK; 378 pte.pte_high &= ~0x3f; 379 pte.pte_low |= pgprot_val(newprot); 380 pte.pte_high |= pgprot_val(newprot) & 0x3f; 381 return pte; 382 } 383 #else 384 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 385 { 386 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 387 } 388 #endif 389 390 391 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 392 pte_t pte); 393 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 394 pte_t pte); 395 396 static inline void update_mmu_cache(struct vm_area_struct *vma, 397 unsigned long address, pte_t *ptep) 398 { 399 pte_t pte = *ptep; 400 __update_tlb(vma, address, pte); 401 __update_cache(vma, address, pte); 402 } 403 404 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 405 unsigned long address, pmd_t *pmdp) 406 { 407 pte_t pte = *(pte_t *)pmdp; 408 409 __update_tlb(vma, address, pte); 410 } 411 412 #define kern_addr_valid(addr) (1) 413 414 #ifdef CONFIG_64BIT_PHYS_ADDR 415 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 416 417 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 418 unsigned long vaddr, 419 unsigned long pfn, 420 unsigned long size, 421 pgprot_t prot) 422 { 423 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 424 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 425 } 426 #define io_remap_pfn_range io_remap_pfn_range 427 #endif 428 429 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 430 431 extern int has_transparent_hugepage(void); 432 433 static inline int pmd_trans_huge(pmd_t pmd) 434 { 435 return !!(pmd_val(pmd) & _PAGE_HUGE); 436 } 437 438 static inline pmd_t pmd_mkhuge(pmd_t pmd) 439 { 440 pmd_val(pmd) |= _PAGE_HUGE; 441 442 return pmd; 443 } 444 445 static inline int pmd_trans_splitting(pmd_t pmd) 446 { 447 return !!(pmd_val(pmd) & _PAGE_SPLITTING); 448 } 449 450 static inline pmd_t pmd_mksplitting(pmd_t pmd) 451 { 452 pmd_val(pmd) |= _PAGE_SPLITTING; 453 454 return pmd; 455 } 456 457 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 458 pmd_t *pmdp, pmd_t pmd); 459 460 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 461 /* Extern to avoid header file madness */ 462 extern void pmdp_splitting_flush(struct vm_area_struct *vma, 463 unsigned long address, 464 pmd_t *pmdp); 465 466 #define __HAVE_ARCH_PMD_WRITE 467 static inline int pmd_write(pmd_t pmd) 468 { 469 return !!(pmd_val(pmd) & _PAGE_WRITE); 470 } 471 472 static inline pmd_t pmd_wrprotect(pmd_t pmd) 473 { 474 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 475 return pmd; 476 } 477 478 static inline pmd_t pmd_mkwrite(pmd_t pmd) 479 { 480 pmd_val(pmd) |= _PAGE_WRITE; 481 if (pmd_val(pmd) & _PAGE_MODIFIED) 482 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 483 484 return pmd; 485 } 486 487 static inline int pmd_dirty(pmd_t pmd) 488 { 489 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 490 } 491 492 static inline pmd_t pmd_mkclean(pmd_t pmd) 493 { 494 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 495 return pmd; 496 } 497 498 static inline pmd_t pmd_mkdirty(pmd_t pmd) 499 { 500 pmd_val(pmd) |= _PAGE_MODIFIED; 501 if (pmd_val(pmd) & _PAGE_WRITE) 502 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 503 504 return pmd; 505 } 506 507 static inline int pmd_young(pmd_t pmd) 508 { 509 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 510 } 511 512 static inline pmd_t pmd_mkold(pmd_t pmd) 513 { 514 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 515 516 return pmd; 517 } 518 519 static inline pmd_t pmd_mkyoung(pmd_t pmd) 520 { 521 pmd_val(pmd) |= _PAGE_ACCESSED; 522 523 if (cpu_has_rixi) { 524 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 525 pmd_val(pmd) |= _PAGE_SILENT_READ; 526 } else { 527 if (pmd_val(pmd) & _PAGE_READ) 528 pmd_val(pmd) |= _PAGE_SILENT_READ; 529 } 530 531 return pmd; 532 } 533 534 /* Extern to avoid header file madness */ 535 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 536 537 static inline unsigned long pmd_pfn(pmd_t pmd) 538 { 539 return pmd_val(pmd) >> _PFN_SHIFT; 540 } 541 542 static inline struct page *pmd_page(pmd_t pmd) 543 { 544 if (pmd_trans_huge(pmd)) 545 return pfn_to_page(pmd_pfn(pmd)); 546 547 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 548 } 549 550 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 551 { 552 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); 553 return pmd; 554 } 555 556 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 557 { 558 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 559 560 return pmd; 561 } 562 563 /* 564 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a 565 * different prototype. 566 */ 567 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR 568 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, 569 unsigned long address, pmd_t *pmdp) 570 { 571 pmd_t old = *pmdp; 572 573 pmd_clear(pmdp); 574 575 return old; 576 } 577 578 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 579 580 #include <asm-generic/pgtable.h> 581 582 /* 583 * uncached accelerated TLB map for video memory access 584 */ 585 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 586 #define __HAVE_PHYS_MEM_ACCESS_PROT 587 588 struct file; 589 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 590 unsigned long size, pgprot_t vma_prot); 591 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 592 unsigned long size, pgprot_t *vma_prot); 593 #endif 594 595 /* 596 * We provide our own get_unmapped area to cope with the virtual aliasing 597 * constraints placed on us by the cache architecture. 598 */ 599 #define HAVE_ARCH_UNMAPPED_AREA 600 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 601 602 /* 603 * No page table caches to initialise 604 */ 605 #define pgtable_cache_init() do { } while (0) 606 607 #endif /* _ASM_PGTABLE_H */ 608