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/cmpxchg.h> 21 #include <asm/io.h> 22 #include <asm/pgtable-bits.h> 23 #include <asm/cpu-features.h> 24 25 struct mm_struct; 26 struct vm_area_struct; 27 28 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \ 29 _page_cachable_default) 30 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 31 _page_cachable_default) 32 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \ 33 _page_cachable_default) 34 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | \ 35 _page_cachable_default) 36 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 37 _PAGE_GLOBAL | _page_cachable_default) 38 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 39 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) 40 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 41 _page_cachable_default) 42 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 43 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 44 45 /* 46 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 47 * execute, and consider it to be the same as read. Also, write 48 * permissions imply read permissions. This is the closest we can get 49 * by reasonable means.. 50 */ 51 52 /* 53 * Dummy values to fill the table in mmap.c 54 * The real values will be generated at runtime 55 */ 56 #define __P000 __pgprot(0) 57 #define __P001 __pgprot(0) 58 #define __P010 __pgprot(0) 59 #define __P011 __pgprot(0) 60 #define __P100 __pgprot(0) 61 #define __P101 __pgprot(0) 62 #define __P110 __pgprot(0) 63 #define __P111 __pgprot(0) 64 65 #define __S000 __pgprot(0) 66 #define __S001 __pgprot(0) 67 #define __S010 __pgprot(0) 68 #define __S011 __pgprot(0) 69 #define __S100 __pgprot(0) 70 #define __S101 __pgprot(0) 71 #define __S110 __pgprot(0) 72 #define __S111 __pgprot(0) 73 74 extern unsigned long _page_cachable_default; 75 76 /* 77 * ZERO_PAGE is a global shared page that is always zero; used 78 * for zero-mapped memory areas etc.. 79 */ 80 81 extern unsigned long empty_zero_page; 82 extern unsigned long zero_page_mask; 83 84 #define ZERO_PAGE(vaddr) \ 85 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 86 #define __HAVE_COLOR_ZERO_PAGE 87 88 extern void paging_init(void); 89 90 /* 91 * Conversion functions: convert a page and protection to a page entry, 92 * and a page entry and page directory to the page they refer to. 93 */ 94 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 95 96 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 97 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 98 #define pmd_page(pmd) __pmd_page(pmd) 99 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 100 101 #define pmd_page_vaddr(pmd) pmd_val(pmd) 102 103 #define htw_stop() \ 104 do { \ 105 unsigned long flags; \ 106 \ 107 if (cpu_has_htw) { \ 108 local_irq_save(flags); \ 109 if(!raw_current_cpu_data.htw_seq++) { \ 110 write_c0_pwctl(read_c0_pwctl() & \ 111 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \ 112 back_to_back_c0_hazard(); \ 113 } \ 114 local_irq_restore(flags); \ 115 } \ 116 } while(0) 117 118 #define htw_start() \ 119 do { \ 120 unsigned long flags; \ 121 \ 122 if (cpu_has_htw) { \ 123 local_irq_save(flags); \ 124 if (!--raw_current_cpu_data.htw_seq) { \ 125 write_c0_pwctl(read_c0_pwctl() | \ 126 (1 << MIPS_PWCTL_PWEN_SHIFT)); \ 127 back_to_back_c0_hazard(); \ 128 } \ 129 local_irq_restore(flags); \ 130 } \ 131 } while(0) 132 133 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 134 pte_t *ptep, pte_t pteval); 135 136 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 137 138 #ifdef CONFIG_XPA 139 # define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL)) 140 #else 141 # define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 142 #endif 143 144 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 145 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC) 146 147 static inline void set_pte(pte_t *ptep, pte_t pte) 148 { 149 ptep->pte_high = pte.pte_high; 150 smp_wmb(); 151 ptep->pte_low = pte.pte_low; 152 153 #ifdef CONFIG_XPA 154 if (pte.pte_high & _PAGE_GLOBAL) { 155 #else 156 if (pte.pte_low & _PAGE_GLOBAL) { 157 #endif 158 pte_t *buddy = ptep_buddy(ptep); 159 /* 160 * Make sure the buddy is global too (if it's !none, 161 * it better already be global) 162 */ 163 if (pte_none(*buddy)) { 164 if (!IS_ENABLED(CONFIG_XPA)) 165 buddy->pte_low |= _PAGE_GLOBAL; 166 buddy->pte_high |= _PAGE_GLOBAL; 167 } 168 } 169 } 170 171 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 172 { 173 pte_t null = __pte(0); 174 175 htw_stop(); 176 /* Preserve global status for the pair */ 177 if (IS_ENABLED(CONFIG_XPA)) { 178 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL) 179 null.pte_high = _PAGE_GLOBAL; 180 } else { 181 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 182 null.pte_low = null.pte_high = _PAGE_GLOBAL; 183 } 184 185 set_pte_at(mm, addr, ptep, null); 186 htw_start(); 187 } 188 #else 189 190 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 191 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 192 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 193 194 /* 195 * Certain architectures need to do special things when pte's 196 * within a page table are directly modified. Thus, the following 197 * hook is made available. 198 */ 199 static inline void set_pte(pte_t *ptep, pte_t pteval) 200 { 201 *ptep = pteval; 202 #if !defined(CONFIG_CPU_R3K_TLB) 203 if (pte_val(pteval) & _PAGE_GLOBAL) { 204 pte_t *buddy = ptep_buddy(ptep); 205 /* 206 * Make sure the buddy is global too (if it's !none, 207 * it better already be global) 208 */ 209 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32) 210 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL); 211 # else 212 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL); 213 # endif 214 } 215 #endif 216 } 217 218 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 219 { 220 htw_stop(); 221 #if !defined(CONFIG_CPU_R3K_TLB) 222 /* Preserve global status for the pair */ 223 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 224 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 225 else 226 #endif 227 set_pte_at(mm, addr, ptep, __pte(0)); 228 htw_start(); 229 } 230 #endif 231 232 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 233 pte_t *ptep, pte_t pteval) 234 { 235 extern void __update_cache(unsigned long address, pte_t pte); 236 237 if (!pte_present(pteval)) 238 goto cache_sync_done; 239 240 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval))) 241 goto cache_sync_done; 242 243 __update_cache(addr, pteval); 244 cache_sync_done: 245 set_pte(ptep, pteval); 246 } 247 248 /* 249 * (pmds are folded into puds so this doesn't get actually called, 250 * but the define is needed for a generic inline function.) 251 */ 252 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 253 254 #ifndef __PAGETABLE_PMD_FOLDED 255 /* 256 * (puds are folded into pgds so this doesn't get actually called, 257 * but the define is needed for a generic inline function.) 258 */ 259 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 260 #endif 261 262 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 263 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 264 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 265 266 /* 267 * We used to declare this array with size but gcc 3.3 and older are not able 268 * to find that this expression is a constant, so the size is dropped. 269 */ 270 extern pgd_t swapper_pg_dir[]; 271 272 /* 273 * The following only work if pte_present() is true. 274 * Undefined behaviour if not.. 275 */ 276 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 277 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 278 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 279 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 280 static inline int pte_special(pte_t pte) { return pte.pte_low & _PAGE_SPECIAL; } 281 282 static inline pte_t pte_wrprotect(pte_t pte) 283 { 284 pte.pte_low &= ~_PAGE_WRITE; 285 if (!IS_ENABLED(CONFIG_XPA)) 286 pte.pte_low &= ~_PAGE_SILENT_WRITE; 287 pte.pte_high &= ~_PAGE_SILENT_WRITE; 288 return pte; 289 } 290 291 static inline pte_t pte_mkclean(pte_t pte) 292 { 293 pte.pte_low &= ~_PAGE_MODIFIED; 294 if (!IS_ENABLED(CONFIG_XPA)) 295 pte.pte_low &= ~_PAGE_SILENT_WRITE; 296 pte.pte_high &= ~_PAGE_SILENT_WRITE; 297 return pte; 298 } 299 300 static inline pte_t pte_mkold(pte_t pte) 301 { 302 pte.pte_low &= ~_PAGE_ACCESSED; 303 if (!IS_ENABLED(CONFIG_XPA)) 304 pte.pte_low &= ~_PAGE_SILENT_READ; 305 pte.pte_high &= ~_PAGE_SILENT_READ; 306 return pte; 307 } 308 309 static inline pte_t pte_mkwrite(pte_t pte) 310 { 311 pte.pte_low |= _PAGE_WRITE; 312 if (pte.pte_low & _PAGE_MODIFIED) { 313 if (!IS_ENABLED(CONFIG_XPA)) 314 pte.pte_low |= _PAGE_SILENT_WRITE; 315 pte.pte_high |= _PAGE_SILENT_WRITE; 316 } 317 return pte; 318 } 319 320 static inline pte_t pte_mkdirty(pte_t pte) 321 { 322 pte.pte_low |= _PAGE_MODIFIED; 323 if (pte.pte_low & _PAGE_WRITE) { 324 if (!IS_ENABLED(CONFIG_XPA)) 325 pte.pte_low |= _PAGE_SILENT_WRITE; 326 pte.pte_high |= _PAGE_SILENT_WRITE; 327 } 328 return pte; 329 } 330 331 static inline pte_t pte_mkyoung(pte_t pte) 332 { 333 pte.pte_low |= _PAGE_ACCESSED; 334 if (!(pte.pte_low & _PAGE_NO_READ)) { 335 if (!IS_ENABLED(CONFIG_XPA)) 336 pte.pte_low |= _PAGE_SILENT_READ; 337 pte.pte_high |= _PAGE_SILENT_READ; 338 } 339 return pte; 340 } 341 342 static inline pte_t pte_mkspecial(pte_t pte) 343 { 344 pte.pte_low |= _PAGE_SPECIAL; 345 return pte; 346 } 347 #else 348 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 349 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 350 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 351 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 352 353 static inline pte_t pte_wrprotect(pte_t pte) 354 { 355 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 356 return pte; 357 } 358 359 static inline pte_t pte_mkclean(pte_t pte) 360 { 361 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 362 return pte; 363 } 364 365 static inline pte_t pte_mkold(pte_t pte) 366 { 367 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 368 return pte; 369 } 370 371 static inline pte_t pte_mkwrite(pte_t pte) 372 { 373 pte_val(pte) |= _PAGE_WRITE; 374 if (pte_val(pte) & _PAGE_MODIFIED) 375 pte_val(pte) |= _PAGE_SILENT_WRITE; 376 return pte; 377 } 378 379 static inline pte_t pte_mkdirty(pte_t pte) 380 { 381 pte_val(pte) |= _PAGE_MODIFIED; 382 if (pte_val(pte) & _PAGE_WRITE) 383 pte_val(pte) |= _PAGE_SILENT_WRITE; 384 return pte; 385 } 386 387 static inline pte_t pte_mkyoung(pte_t pte) 388 { 389 pte_val(pte) |= _PAGE_ACCESSED; 390 if (!(pte_val(pte) & _PAGE_NO_READ)) 391 pte_val(pte) |= _PAGE_SILENT_READ; 392 return pte; 393 } 394 395 static inline pte_t pte_mkspecial(pte_t pte) 396 { 397 pte_val(pte) |= _PAGE_SPECIAL; 398 return pte; 399 } 400 401 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 402 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 403 404 static inline pte_t pte_mkhuge(pte_t pte) 405 { 406 pte_val(pte) |= _PAGE_HUGE; 407 return pte; 408 } 409 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 410 #endif 411 412 /* 413 * Macro to make mark a page protection value as "uncacheable". Note 414 * that "protection" is really a misnomer here as the protection value 415 * contains the memory attribute bits, dirty bits, and various other 416 * bits as well. 417 */ 418 #define pgprot_noncached pgprot_noncached 419 420 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 421 { 422 unsigned long prot = pgprot_val(_prot); 423 424 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 425 426 return __pgprot(prot); 427 } 428 429 #define pgprot_writecombine pgprot_writecombine 430 431 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 432 { 433 unsigned long prot = pgprot_val(_prot); 434 435 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 436 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 437 438 return __pgprot(prot); 439 } 440 441 /* 442 * Conversion functions: convert a page and protection to a page entry, 443 * and a page entry and page directory to the page they refer to. 444 */ 445 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 446 447 #if defined(CONFIG_XPA) 448 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 449 { 450 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 451 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 452 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 453 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 454 return pte; 455 } 456 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 457 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 458 { 459 pte.pte_low &= _PAGE_CHG_MASK; 460 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 461 pte.pte_low |= pgprot_val(newprot); 462 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 463 return pte; 464 } 465 #else 466 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 467 { 468 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 469 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 470 } 471 #endif 472 473 474 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 475 pte_t pte); 476 477 static inline void update_mmu_cache(struct vm_area_struct *vma, 478 unsigned long address, pte_t *ptep) 479 { 480 pte_t pte = *ptep; 481 __update_tlb(vma, address, pte); 482 } 483 484 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 485 unsigned long address, pmd_t *pmdp) 486 { 487 pte_t pte = *(pte_t *)pmdp; 488 489 __update_tlb(vma, address, pte); 490 } 491 492 #define kern_addr_valid(addr) (1) 493 494 #ifdef CONFIG_PHYS_ADDR_T_64BIT 495 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 496 497 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 498 unsigned long vaddr, 499 unsigned long pfn, 500 unsigned long size, 501 pgprot_t prot) 502 { 503 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 504 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 505 } 506 #define io_remap_pfn_range io_remap_pfn_range 507 #endif 508 509 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 510 511 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 512 #define pmdp_establish generic_pmdp_establish 513 514 #define has_transparent_hugepage has_transparent_hugepage 515 extern int has_transparent_hugepage(void); 516 517 static inline int pmd_trans_huge(pmd_t pmd) 518 { 519 return !!(pmd_val(pmd) & _PAGE_HUGE); 520 } 521 522 static inline pmd_t pmd_mkhuge(pmd_t pmd) 523 { 524 pmd_val(pmd) |= _PAGE_HUGE; 525 526 return pmd; 527 } 528 529 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 530 pmd_t *pmdp, pmd_t pmd); 531 532 #define pmd_write pmd_write 533 static inline int pmd_write(pmd_t pmd) 534 { 535 return !!(pmd_val(pmd) & _PAGE_WRITE); 536 } 537 538 static inline pmd_t pmd_wrprotect(pmd_t pmd) 539 { 540 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 541 return pmd; 542 } 543 544 static inline pmd_t pmd_mkwrite(pmd_t pmd) 545 { 546 pmd_val(pmd) |= _PAGE_WRITE; 547 if (pmd_val(pmd) & _PAGE_MODIFIED) 548 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 549 550 return pmd; 551 } 552 553 static inline int pmd_dirty(pmd_t pmd) 554 { 555 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 556 } 557 558 static inline pmd_t pmd_mkclean(pmd_t pmd) 559 { 560 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 561 return pmd; 562 } 563 564 static inline pmd_t pmd_mkdirty(pmd_t pmd) 565 { 566 pmd_val(pmd) |= _PAGE_MODIFIED; 567 if (pmd_val(pmd) & _PAGE_WRITE) 568 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 569 570 return pmd; 571 } 572 573 static inline int pmd_young(pmd_t pmd) 574 { 575 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 576 } 577 578 static inline pmd_t pmd_mkold(pmd_t pmd) 579 { 580 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 581 582 return pmd; 583 } 584 585 static inline pmd_t pmd_mkyoung(pmd_t pmd) 586 { 587 pmd_val(pmd) |= _PAGE_ACCESSED; 588 589 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 590 pmd_val(pmd) |= _PAGE_SILENT_READ; 591 592 return pmd; 593 } 594 595 /* Extern to avoid header file madness */ 596 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 597 598 static inline unsigned long pmd_pfn(pmd_t pmd) 599 { 600 return pmd_val(pmd) >> _PFN_SHIFT; 601 } 602 603 static inline struct page *pmd_page(pmd_t pmd) 604 { 605 if (pmd_trans_huge(pmd)) 606 return pfn_to_page(pmd_pfn(pmd)); 607 608 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 609 } 610 611 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 612 { 613 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) | 614 (pgprot_val(newprot) & ~_PAGE_CHG_MASK); 615 return pmd; 616 } 617 618 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 619 { 620 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 621 622 return pmd; 623 } 624 625 /* 626 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 627 * different prototype. 628 */ 629 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 630 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 631 unsigned long address, pmd_t *pmdp) 632 { 633 pmd_t old = *pmdp; 634 635 pmd_clear(pmdp); 636 637 return old; 638 } 639 640 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 641 642 #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) 643 644 #include <asm-generic/pgtable.h> 645 646 /* 647 * uncached accelerated TLB map for video memory access 648 */ 649 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 650 #define __HAVE_PHYS_MEM_ACCESS_PROT 651 652 struct file; 653 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 654 unsigned long size, pgprot_t vma_prot); 655 #endif 656 657 /* 658 * We provide our own get_unmapped area to cope with the virtual aliasing 659 * constraints placed on us by the cache architecture. 660 */ 661 #define HAVE_ARCH_UNMAPPED_AREA 662 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 663 664 #endif /* _ASM_PGTABLE_H */ 665