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