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_SHARED vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED) 29 30 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 31 _PAGE_GLOBAL | _page_cachable_default) 32 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 33 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) 34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 36 37 /* 38 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 39 * execute, and consider it to be the same as read. Also, write 40 * permissions imply read permissions. This is the closest we can get 41 * by reasonable means.. 42 */ 43 44 /* 45 * Dummy values to fill the table in mmap.c 46 * The real values will be generated at runtime 47 */ 48 #define __P000 __pgprot(0) 49 #define __P001 __pgprot(0) 50 #define __P010 __pgprot(0) 51 #define __P011 __pgprot(0) 52 #define __P100 __pgprot(0) 53 #define __P101 __pgprot(0) 54 #define __P110 __pgprot(0) 55 #define __P111 __pgprot(0) 56 57 #define __S000 __pgprot(0) 58 #define __S001 __pgprot(0) 59 #define __S010 __pgprot(0) 60 #define __S011 __pgprot(0) 61 #define __S100 __pgprot(0) 62 #define __S101 __pgprot(0) 63 #define __S110 __pgprot(0) 64 #define __S111 __pgprot(0) 65 66 extern unsigned long _page_cachable_default; 67 68 /* 69 * ZERO_PAGE is a global shared page that is always zero; used 70 * for zero-mapped memory areas etc.. 71 */ 72 73 extern unsigned long empty_zero_page; 74 extern unsigned long zero_page_mask; 75 76 #define ZERO_PAGE(vaddr) \ 77 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 78 #define __HAVE_COLOR_ZERO_PAGE 79 80 extern void paging_init(void); 81 82 /* 83 * Conversion functions: convert a page and protection to a page entry, 84 * and a page entry and page directory to the page they refer to. 85 */ 86 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 87 88 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 89 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 90 #define pmd_page(pmd) __pmd_page(pmd) 91 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 92 93 #define pmd_page_vaddr(pmd) pmd_val(pmd) 94 95 #define htw_stop() \ 96 do { \ 97 unsigned long flags; \ 98 \ 99 if (cpu_has_htw) { \ 100 local_irq_save(flags); \ 101 if(!raw_current_cpu_data.htw_seq++) { \ 102 write_c0_pwctl(read_c0_pwctl() & \ 103 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \ 104 back_to_back_c0_hazard(); \ 105 } \ 106 local_irq_restore(flags); \ 107 } \ 108 } while(0) 109 110 #define htw_start() \ 111 do { \ 112 unsigned long flags; \ 113 \ 114 if (cpu_has_htw) { \ 115 local_irq_save(flags); \ 116 if (!--raw_current_cpu_data.htw_seq) { \ 117 write_c0_pwctl(read_c0_pwctl() | \ 118 (1 << MIPS_PWCTL_PWEN_SHIFT)); \ 119 back_to_back_c0_hazard(); \ 120 } \ 121 local_irq_restore(flags); \ 122 } \ 123 } while(0) 124 125 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 126 pte_t *ptep, pte_t pteval); 127 128 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 129 130 #ifdef CONFIG_XPA 131 # define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL)) 132 #else 133 # define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 134 #endif 135 136 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 137 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC) 138 139 static inline void set_pte(pte_t *ptep, pte_t pte) 140 { 141 ptep->pte_high = pte.pte_high; 142 smp_wmb(); 143 ptep->pte_low = pte.pte_low; 144 145 #ifdef CONFIG_XPA 146 if (pte.pte_high & _PAGE_GLOBAL) { 147 #else 148 if (pte.pte_low & _PAGE_GLOBAL) { 149 #endif 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 if (!IS_ENABLED(CONFIG_XPA)) 157 buddy->pte_low |= _PAGE_GLOBAL; 158 buddy->pte_high |= _PAGE_GLOBAL; 159 } 160 } 161 } 162 163 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 164 { 165 pte_t null = __pte(0); 166 167 htw_stop(); 168 /* Preserve global status for the pair */ 169 if (IS_ENABLED(CONFIG_XPA)) { 170 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL) 171 null.pte_high = _PAGE_GLOBAL; 172 } else { 173 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 174 null.pte_low = null.pte_high = _PAGE_GLOBAL; 175 } 176 177 set_pte_at(mm, addr, ptep, null); 178 htw_start(); 179 } 180 #else 181 182 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 183 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 184 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 185 186 /* 187 * Certain architectures need to do special things when pte's 188 * within a page table are directly modified. Thus, the following 189 * hook is made available. 190 */ 191 static inline void set_pte(pte_t *ptep, pte_t pteval) 192 { 193 *ptep = pteval; 194 #if !defined(CONFIG_CPU_R3K_TLB) 195 if (pte_val(pteval) & _PAGE_GLOBAL) { 196 pte_t *buddy = ptep_buddy(ptep); 197 /* 198 * Make sure the buddy is global too (if it's !none, 199 * it better already be global) 200 */ 201 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32) 202 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL); 203 # else 204 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL); 205 # endif 206 } 207 #endif 208 } 209 210 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 211 { 212 htw_stop(); 213 #if !defined(CONFIG_CPU_R3K_TLB) 214 /* Preserve global status for the pair */ 215 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 216 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 217 else 218 #endif 219 set_pte_at(mm, addr, ptep, __pte(0)); 220 htw_start(); 221 } 222 #endif 223 224 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 225 pte_t *ptep, pte_t pteval) 226 { 227 extern void __update_cache(unsigned long address, pte_t pte); 228 229 if (!pte_present(pteval)) 230 goto cache_sync_done; 231 232 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval))) 233 goto cache_sync_done; 234 235 __update_cache(addr, pteval); 236 cache_sync_done: 237 set_pte(ptep, pteval); 238 } 239 240 /* 241 * (pmds are folded into puds so this doesn't get actually called, 242 * but the define is needed for a generic inline function.) 243 */ 244 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 245 246 #ifndef __PAGETABLE_PMD_FOLDED 247 /* 248 * (puds are folded into pgds so this doesn't get actually called, 249 * but the define is needed for a generic inline function.) 250 */ 251 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 252 #endif 253 254 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 255 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 256 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 257 258 /* 259 * We used to declare this array with size but gcc 3.3 and older are not able 260 * to find that this expression is a constant, so the size is dropped. 261 */ 262 extern pgd_t swapper_pg_dir[]; 263 264 /* 265 * Platform specific pte_special() and pte_mkspecial() definitions 266 * are required only when ARCH_HAS_PTE_SPECIAL is enabled. 267 */ 268 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 269 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 270 static inline int pte_special(pte_t pte) 271 { 272 return pte.pte_low & _PAGE_SPECIAL; 273 } 274 275 static inline pte_t pte_mkspecial(pte_t pte) 276 { 277 pte.pte_low |= _PAGE_SPECIAL; 278 return pte; 279 } 280 #else 281 static inline int pte_special(pte_t pte) 282 { 283 return pte_val(pte) & _PAGE_SPECIAL; 284 } 285 286 static inline pte_t pte_mkspecial(pte_t pte) 287 { 288 pte_val(pte) |= _PAGE_SPECIAL; 289 return pte; 290 } 291 #endif 292 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 293 294 /* 295 * The following only work if pte_present() is true. 296 * Undefined behaviour if not.. 297 */ 298 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 299 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 300 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 301 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 302 303 static inline pte_t pte_wrprotect(pte_t pte) 304 { 305 pte.pte_low &= ~_PAGE_WRITE; 306 if (!IS_ENABLED(CONFIG_XPA)) 307 pte.pte_low &= ~_PAGE_SILENT_WRITE; 308 pte.pte_high &= ~_PAGE_SILENT_WRITE; 309 return pte; 310 } 311 312 static inline pte_t pte_mkclean(pte_t pte) 313 { 314 pte.pte_low &= ~_PAGE_MODIFIED; 315 if (!IS_ENABLED(CONFIG_XPA)) 316 pte.pte_low &= ~_PAGE_SILENT_WRITE; 317 pte.pte_high &= ~_PAGE_SILENT_WRITE; 318 return pte; 319 } 320 321 static inline pte_t pte_mkold(pte_t pte) 322 { 323 pte.pte_low &= ~_PAGE_ACCESSED; 324 if (!IS_ENABLED(CONFIG_XPA)) 325 pte.pte_low &= ~_PAGE_SILENT_READ; 326 pte.pte_high &= ~_PAGE_SILENT_READ; 327 return pte; 328 } 329 330 static inline pte_t pte_mkwrite(pte_t pte) 331 { 332 pte.pte_low |= _PAGE_WRITE; 333 if (pte.pte_low & _PAGE_MODIFIED) { 334 if (!IS_ENABLED(CONFIG_XPA)) 335 pte.pte_low |= _PAGE_SILENT_WRITE; 336 pte.pte_high |= _PAGE_SILENT_WRITE; 337 } 338 return pte; 339 } 340 341 static inline pte_t pte_mkdirty(pte_t pte) 342 { 343 pte.pte_low |= _PAGE_MODIFIED; 344 if (pte.pte_low & _PAGE_WRITE) { 345 if (!IS_ENABLED(CONFIG_XPA)) 346 pte.pte_low |= _PAGE_SILENT_WRITE; 347 pte.pte_high |= _PAGE_SILENT_WRITE; 348 } 349 return pte; 350 } 351 352 static inline pte_t pte_mkyoung(pte_t pte) 353 { 354 pte.pte_low |= _PAGE_ACCESSED; 355 if (!(pte.pte_low & _PAGE_NO_READ)) { 356 if (!IS_ENABLED(CONFIG_XPA)) 357 pte.pte_low |= _PAGE_SILENT_READ; 358 pte.pte_high |= _PAGE_SILENT_READ; 359 } 360 return pte; 361 } 362 #else 363 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 364 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 365 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 366 367 static inline pte_t pte_wrprotect(pte_t pte) 368 { 369 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 370 return pte; 371 } 372 373 static inline pte_t pte_mkclean(pte_t pte) 374 { 375 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 376 return pte; 377 } 378 379 static inline pte_t pte_mkold(pte_t pte) 380 { 381 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 382 return pte; 383 } 384 385 static inline pte_t pte_mkwrite(pte_t pte) 386 { 387 pte_val(pte) |= _PAGE_WRITE; 388 if (pte_val(pte) & _PAGE_MODIFIED) 389 pte_val(pte) |= _PAGE_SILENT_WRITE; 390 return pte; 391 } 392 393 static inline pte_t pte_mkdirty(pte_t pte) 394 { 395 pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY; 396 if (pte_val(pte) & _PAGE_WRITE) 397 pte_val(pte) |= _PAGE_SILENT_WRITE; 398 return pte; 399 } 400 401 static inline pte_t pte_mkyoung(pte_t pte) 402 { 403 pte_val(pte) |= _PAGE_ACCESSED; 404 if (!(pte_val(pte) & _PAGE_NO_READ)) 405 pte_val(pte) |= _PAGE_SILENT_READ; 406 return pte; 407 } 408 409 #define pte_sw_mkyoung pte_mkyoung 410 411 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 412 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 413 414 static inline pte_t pte_mkhuge(pte_t pte) 415 { 416 pte_val(pte) |= _PAGE_HUGE; 417 return pte; 418 } 419 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 420 421 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 422 static inline bool pte_soft_dirty(pte_t pte) 423 { 424 return pte_val(pte) & _PAGE_SOFT_DIRTY; 425 } 426 #define pte_swp_soft_dirty pte_soft_dirty 427 428 static inline pte_t pte_mksoft_dirty(pte_t pte) 429 { 430 pte_val(pte) |= _PAGE_SOFT_DIRTY; 431 return pte; 432 } 433 #define pte_swp_mksoft_dirty pte_mksoft_dirty 434 435 static inline pte_t pte_clear_soft_dirty(pte_t pte) 436 { 437 pte_val(pte) &= ~(_PAGE_SOFT_DIRTY); 438 return pte; 439 } 440 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty 441 442 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 443 444 #endif 445 446 /* 447 * Macro to make mark a page protection value as "uncacheable". Note 448 * that "protection" is really a misnomer here as the protection value 449 * contains the memory attribute bits, dirty bits, and various other 450 * bits as well. 451 */ 452 #define pgprot_noncached pgprot_noncached 453 454 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 455 { 456 unsigned long prot = pgprot_val(_prot); 457 458 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 459 460 return __pgprot(prot); 461 } 462 463 #define pgprot_writecombine pgprot_writecombine 464 465 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 466 { 467 unsigned long prot = pgprot_val(_prot); 468 469 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 470 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 471 472 return __pgprot(prot); 473 } 474 475 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma, 476 unsigned long address) 477 { 478 } 479 480 #define __HAVE_ARCH_PTE_SAME 481 static inline int pte_same(pte_t pte_a, pte_t pte_b) 482 { 483 return pte_val(pte_a) == pte_val(pte_b); 484 } 485 486 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 487 static inline int ptep_set_access_flags(struct vm_area_struct *vma, 488 unsigned long address, pte_t *ptep, 489 pte_t entry, int dirty) 490 { 491 if (!pte_same(*ptep, entry)) 492 set_pte_at(vma->vm_mm, address, ptep, entry); 493 /* 494 * update_mmu_cache will unconditionally execute, handling both 495 * the case that the PTE changed and the spurious fault case. 496 */ 497 return true; 498 } 499 500 /* 501 * Conversion functions: convert a page and protection to a page entry, 502 * and a page entry and page directory to the page they refer to. 503 */ 504 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 505 506 #if defined(CONFIG_XPA) 507 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 508 { 509 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 510 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 511 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 512 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 513 return pte; 514 } 515 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 516 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 517 { 518 pte.pte_low &= _PAGE_CHG_MASK; 519 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 520 pte.pte_low |= pgprot_val(newprot); 521 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 522 return pte; 523 } 524 #else 525 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 526 { 527 pte_val(pte) &= _PAGE_CHG_MASK; 528 pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK; 529 if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ)) 530 pte_val(pte) |= _PAGE_SILENT_READ; 531 return pte; 532 } 533 #endif 534 535 536 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 537 pte_t pte); 538 539 static inline void update_mmu_cache(struct vm_area_struct *vma, 540 unsigned long address, pte_t *ptep) 541 { 542 pte_t pte = *ptep; 543 __update_tlb(vma, address, pte); 544 } 545 546 #define __HAVE_ARCH_UPDATE_MMU_TLB 547 #define update_mmu_tlb update_mmu_cache 548 549 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 550 unsigned long address, pmd_t *pmdp) 551 { 552 pte_t pte = *(pte_t *)pmdp; 553 554 __update_tlb(vma, address, pte); 555 } 556 557 #define kern_addr_valid(addr) (1) 558 559 /* 560 * Allow physical addresses to be fixed up to help 36-bit peripherals. 561 */ 562 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR 563 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size); 564 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, 565 unsigned long pfn, unsigned long size, pgprot_t prot); 566 #define io_remap_pfn_range io_remap_pfn_range 567 #else 568 #define fixup_bigphys_addr(addr, size) (addr) 569 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */ 570 571 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 572 573 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 574 #define pmdp_establish generic_pmdp_establish 575 576 #define has_transparent_hugepage has_transparent_hugepage 577 extern int has_transparent_hugepage(void); 578 579 static inline int pmd_trans_huge(pmd_t pmd) 580 { 581 return !!(pmd_val(pmd) & _PAGE_HUGE); 582 } 583 584 static inline pmd_t pmd_mkhuge(pmd_t pmd) 585 { 586 pmd_val(pmd) |= _PAGE_HUGE; 587 588 return pmd; 589 } 590 591 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 592 pmd_t *pmdp, pmd_t pmd); 593 594 #define pmd_write pmd_write 595 static inline int pmd_write(pmd_t pmd) 596 { 597 return !!(pmd_val(pmd) & _PAGE_WRITE); 598 } 599 600 static inline pmd_t pmd_wrprotect(pmd_t pmd) 601 { 602 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 603 return pmd; 604 } 605 606 static inline pmd_t pmd_mkwrite(pmd_t pmd) 607 { 608 pmd_val(pmd) |= _PAGE_WRITE; 609 if (pmd_val(pmd) & _PAGE_MODIFIED) 610 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 611 612 return pmd; 613 } 614 615 static inline int pmd_dirty(pmd_t pmd) 616 { 617 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 618 } 619 620 static inline pmd_t pmd_mkclean(pmd_t pmd) 621 { 622 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 623 return pmd; 624 } 625 626 static inline pmd_t pmd_mkdirty(pmd_t pmd) 627 { 628 pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY; 629 if (pmd_val(pmd) & _PAGE_WRITE) 630 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 631 632 return pmd; 633 } 634 635 static inline int pmd_young(pmd_t pmd) 636 { 637 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 638 } 639 640 static inline pmd_t pmd_mkold(pmd_t pmd) 641 { 642 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 643 644 return pmd; 645 } 646 647 static inline pmd_t pmd_mkyoung(pmd_t pmd) 648 { 649 pmd_val(pmd) |= _PAGE_ACCESSED; 650 651 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 652 pmd_val(pmd) |= _PAGE_SILENT_READ; 653 654 return pmd; 655 } 656 657 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 658 static inline int pmd_soft_dirty(pmd_t pmd) 659 { 660 return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY); 661 } 662 663 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 664 { 665 pmd_val(pmd) |= _PAGE_SOFT_DIRTY; 666 return pmd; 667 } 668 669 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 670 { 671 pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY); 672 return pmd; 673 } 674 675 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 676 677 /* Extern to avoid header file madness */ 678 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 679 680 static inline unsigned long pmd_pfn(pmd_t pmd) 681 { 682 return pmd_val(pmd) >> _PFN_SHIFT; 683 } 684 685 static inline struct page *pmd_page(pmd_t pmd) 686 { 687 if (pmd_trans_huge(pmd)) 688 return pfn_to_page(pmd_pfn(pmd)); 689 690 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 691 } 692 693 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 694 { 695 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) | 696 (pgprot_val(newprot) & ~_PAGE_CHG_MASK); 697 return pmd; 698 } 699 700 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 701 { 702 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 703 704 return pmd; 705 } 706 707 /* 708 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 709 * different prototype. 710 */ 711 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 712 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 713 unsigned long address, pmd_t *pmdp) 714 { 715 pmd_t old = *pmdp; 716 717 pmd_clear(pmdp); 718 719 return old; 720 } 721 722 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 723 724 #ifdef _PAGE_HUGE 725 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 726 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 727 #endif 728 729 #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) 730 731 /* 732 * We provide our own get_unmapped area to cope with the virtual aliasing 733 * constraints placed on us by the cache architecture. 734 */ 735 #define HAVE_ARCH_UNMAPPED_AREA 736 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 737 738 #endif /* _ASM_PGTABLE_H */ 739