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_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 41 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 42 43 /* 44 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 45 * execute, and consider it to be the same as read. Also, write 46 * permissions imply read permissions. This is the closest we can get 47 * by reasonable means.. 48 */ 49 50 /* 51 * Dummy values to fill the table in mmap.c 52 * The real values will be generated at runtime 53 */ 54 #define __P000 __pgprot(0) 55 #define __P001 __pgprot(0) 56 #define __P010 __pgprot(0) 57 #define __P011 __pgprot(0) 58 #define __P100 __pgprot(0) 59 #define __P101 __pgprot(0) 60 #define __P110 __pgprot(0) 61 #define __P111 __pgprot(0) 62 63 #define __S000 __pgprot(0) 64 #define __S001 __pgprot(0) 65 #define __S010 __pgprot(0) 66 #define __S011 __pgprot(0) 67 #define __S100 __pgprot(0) 68 #define __S101 __pgprot(0) 69 #define __S110 __pgprot(0) 70 #define __S111 __pgprot(0) 71 72 extern unsigned long _page_cachable_default; 73 74 /* 75 * ZERO_PAGE is a global shared page that is always zero; used 76 * for zero-mapped memory areas etc.. 77 */ 78 79 extern unsigned long empty_zero_page; 80 extern unsigned long zero_page_mask; 81 82 #define ZERO_PAGE(vaddr) \ 83 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 84 #define __HAVE_COLOR_ZERO_PAGE 85 86 extern void paging_init(void); 87 88 /* 89 * Conversion functions: convert a page and protection to a page entry, 90 * and a page entry and page directory to the page they refer to. 91 */ 92 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 93 94 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 95 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 96 #define pmd_page(pmd) __pmd_page(pmd) 97 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 98 99 #define pmd_page_vaddr(pmd) pmd_val(pmd) 100 101 #define htw_stop() \ 102 do { \ 103 unsigned long flags; \ 104 \ 105 if (cpu_has_htw) { \ 106 local_irq_save(flags); \ 107 if(!raw_current_cpu_data.htw_seq++) { \ 108 write_c0_pwctl(read_c0_pwctl() & \ 109 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \ 110 back_to_back_c0_hazard(); \ 111 } \ 112 local_irq_restore(flags); \ 113 } \ 114 } while(0) 115 116 #define htw_start() \ 117 do { \ 118 unsigned long flags; \ 119 \ 120 if (cpu_has_htw) { \ 121 local_irq_save(flags); \ 122 if (!--raw_current_cpu_data.htw_seq) { \ 123 write_c0_pwctl(read_c0_pwctl() | \ 124 (1 << MIPS_PWCTL_PWEN_SHIFT)); \ 125 back_to_back_c0_hazard(); \ 126 } \ 127 local_irq_restore(flags); \ 128 } \ 129 } while(0) 130 131 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 132 pte_t *ptep, pte_t pteval); 133 134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 135 136 #ifdef CONFIG_XPA 137 # define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL)) 138 #else 139 # define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 140 #endif 141 142 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 143 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC) 144 145 static inline void set_pte(pte_t *ptep, pte_t pte) 146 { 147 ptep->pte_high = pte.pte_high; 148 smp_wmb(); 149 ptep->pte_low = pte.pte_low; 150 151 #ifdef CONFIG_XPA 152 if (pte.pte_high & _PAGE_GLOBAL) { 153 #else 154 if (pte.pte_low & _PAGE_GLOBAL) { 155 #endif 156 pte_t *buddy = ptep_buddy(ptep); 157 /* 158 * Make sure the buddy is global too (if it's !none, 159 * it better already be global) 160 */ 161 if (pte_none(*buddy)) { 162 if (!IS_ENABLED(CONFIG_XPA)) 163 buddy->pte_low |= _PAGE_GLOBAL; 164 buddy->pte_high |= _PAGE_GLOBAL; 165 } 166 } 167 } 168 169 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 170 { 171 pte_t null = __pte(0); 172 173 htw_stop(); 174 /* Preserve global status for the pair */ 175 if (IS_ENABLED(CONFIG_XPA)) { 176 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL) 177 null.pte_high = _PAGE_GLOBAL; 178 } else { 179 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 180 null.pte_low = null.pte_high = _PAGE_GLOBAL; 181 } 182 183 set_pte_at(mm, addr, ptep, null); 184 htw_start(); 185 } 186 #else 187 188 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 189 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 190 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 191 192 /* 193 * Certain architectures need to do special things when pte's 194 * within a page table are directly modified. Thus, the following 195 * hook is made available. 196 */ 197 static inline void set_pte(pte_t *ptep, pte_t pteval) 198 { 199 *ptep = pteval; 200 #if !defined(CONFIG_CPU_R3K_TLB) 201 if (pte_val(pteval) & _PAGE_GLOBAL) { 202 pte_t *buddy = ptep_buddy(ptep); 203 /* 204 * Make sure the buddy is global too (if it's !none, 205 * it better already be global) 206 */ 207 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32) 208 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL); 209 # else 210 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL); 211 # endif 212 } 213 #endif 214 } 215 216 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 217 { 218 htw_stop(); 219 #if !defined(CONFIG_CPU_R3K_TLB) 220 /* Preserve global status for the pair */ 221 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 222 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 223 else 224 #endif 225 set_pte_at(mm, addr, ptep, __pte(0)); 226 htw_start(); 227 } 228 #endif 229 230 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 231 pte_t *ptep, pte_t pteval) 232 { 233 extern void __update_cache(unsigned long address, pte_t pte); 234 235 if (!pte_present(pteval)) 236 goto cache_sync_done; 237 238 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval))) 239 goto cache_sync_done; 240 241 __update_cache(addr, pteval); 242 cache_sync_done: 243 set_pte(ptep, pteval); 244 } 245 246 /* 247 * (pmds are folded into puds so this doesn't get actually called, 248 * but the define is needed for a generic inline function.) 249 */ 250 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 251 252 #ifndef __PAGETABLE_PMD_FOLDED 253 /* 254 * (puds are folded into pgds so this doesn't get actually called, 255 * but the define is needed for a generic inline function.) 256 */ 257 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 258 #endif 259 260 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 261 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 262 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 263 264 /* 265 * We used to declare this array with size but gcc 3.3 and older are not able 266 * to find that this expression is a constant, so the size is dropped. 267 */ 268 extern pgd_t swapper_pg_dir[]; 269 270 /* 271 * Platform specific pte_special() and pte_mkspecial() definitions 272 * are required only when ARCH_HAS_PTE_SPECIAL is enabled. 273 */ 274 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 275 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 276 static inline int pte_special(pte_t pte) 277 { 278 return pte.pte_low & _PAGE_SPECIAL; 279 } 280 281 static inline pte_t pte_mkspecial(pte_t pte) 282 { 283 pte.pte_low |= _PAGE_SPECIAL; 284 return pte; 285 } 286 #else 287 static inline int pte_special(pte_t pte) 288 { 289 return pte_val(pte) & _PAGE_SPECIAL; 290 } 291 292 static inline pte_t pte_mkspecial(pte_t pte) 293 { 294 pte_val(pte) |= _PAGE_SPECIAL; 295 return pte; 296 } 297 #endif 298 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 299 300 /* 301 * The following only work if pte_present() is true. 302 * Undefined behaviour if not.. 303 */ 304 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 305 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 306 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 307 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 308 309 static inline pte_t pte_wrprotect(pte_t pte) 310 { 311 pte.pte_low &= ~_PAGE_WRITE; 312 if (!IS_ENABLED(CONFIG_XPA)) 313 pte.pte_low &= ~_PAGE_SILENT_WRITE; 314 pte.pte_high &= ~_PAGE_SILENT_WRITE; 315 return pte; 316 } 317 318 static inline pte_t pte_mkclean(pte_t pte) 319 { 320 pte.pte_low &= ~_PAGE_MODIFIED; 321 if (!IS_ENABLED(CONFIG_XPA)) 322 pte.pte_low &= ~_PAGE_SILENT_WRITE; 323 pte.pte_high &= ~_PAGE_SILENT_WRITE; 324 return pte; 325 } 326 327 static inline pte_t pte_mkold(pte_t pte) 328 { 329 pte.pte_low &= ~_PAGE_ACCESSED; 330 if (!IS_ENABLED(CONFIG_XPA)) 331 pte.pte_low &= ~_PAGE_SILENT_READ; 332 pte.pte_high &= ~_PAGE_SILENT_READ; 333 return pte; 334 } 335 336 static inline pte_t pte_mkwrite(pte_t pte) 337 { 338 pte.pte_low |= _PAGE_WRITE; 339 if (pte.pte_low & _PAGE_MODIFIED) { 340 if (!IS_ENABLED(CONFIG_XPA)) 341 pte.pte_low |= _PAGE_SILENT_WRITE; 342 pte.pte_high |= _PAGE_SILENT_WRITE; 343 } 344 return pte; 345 } 346 347 static inline pte_t pte_mkdirty(pte_t pte) 348 { 349 pte.pte_low |= _PAGE_MODIFIED; 350 if (pte.pte_low & _PAGE_WRITE) { 351 if (!IS_ENABLED(CONFIG_XPA)) 352 pte.pte_low |= _PAGE_SILENT_WRITE; 353 pte.pte_high |= _PAGE_SILENT_WRITE; 354 } 355 return pte; 356 } 357 358 static inline pte_t pte_mkyoung(pte_t pte) 359 { 360 pte.pte_low |= _PAGE_ACCESSED; 361 if (!(pte.pte_low & _PAGE_NO_READ)) { 362 if (!IS_ENABLED(CONFIG_XPA)) 363 pte.pte_low |= _PAGE_SILENT_READ; 364 pte.pte_high |= _PAGE_SILENT_READ; 365 } 366 return pte; 367 } 368 #else 369 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 370 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 371 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 372 373 static inline pte_t pte_wrprotect(pte_t pte) 374 { 375 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 376 return pte; 377 } 378 379 static inline pte_t pte_mkclean(pte_t pte) 380 { 381 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 382 return pte; 383 } 384 385 static inline pte_t pte_mkold(pte_t pte) 386 { 387 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 388 return pte; 389 } 390 391 static inline pte_t pte_mkwrite(pte_t pte) 392 { 393 pte_val(pte) |= _PAGE_WRITE; 394 if (pte_val(pte) & _PAGE_MODIFIED) 395 pte_val(pte) |= _PAGE_SILENT_WRITE; 396 return pte; 397 } 398 399 static inline pte_t pte_mkdirty(pte_t pte) 400 { 401 pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY; 402 if (pte_val(pte) & _PAGE_WRITE) 403 pte_val(pte) |= _PAGE_SILENT_WRITE; 404 return pte; 405 } 406 407 static inline pte_t pte_mkyoung(pte_t pte) 408 { 409 pte_val(pte) |= _PAGE_ACCESSED; 410 if (!(pte_val(pte) & _PAGE_NO_READ)) 411 pte_val(pte) |= _PAGE_SILENT_READ; 412 return pte; 413 } 414 415 #define pte_sw_mkyoung pte_mkyoung 416 417 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 418 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 419 420 static inline pte_t pte_mkhuge(pte_t pte) 421 { 422 pte_val(pte) |= _PAGE_HUGE; 423 return pte; 424 } 425 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 426 427 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 428 static inline bool pte_soft_dirty(pte_t pte) 429 { 430 return pte_val(pte) & _PAGE_SOFT_DIRTY; 431 } 432 #define pte_swp_soft_dirty pte_soft_dirty 433 434 static inline pte_t pte_mksoft_dirty(pte_t pte) 435 { 436 pte_val(pte) |= _PAGE_SOFT_DIRTY; 437 return pte; 438 } 439 #define pte_swp_mksoft_dirty pte_mksoft_dirty 440 441 static inline pte_t pte_clear_soft_dirty(pte_t pte) 442 { 443 pte_val(pte) &= ~(_PAGE_SOFT_DIRTY); 444 return pte; 445 } 446 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty 447 448 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 449 450 #endif 451 452 /* 453 * Macro to make mark a page protection value as "uncacheable". Note 454 * that "protection" is really a misnomer here as the protection value 455 * contains the memory attribute bits, dirty bits, and various other 456 * bits as well. 457 */ 458 #define pgprot_noncached pgprot_noncached 459 460 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 461 { 462 unsigned long prot = pgprot_val(_prot); 463 464 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 465 466 return __pgprot(prot); 467 } 468 469 #define pgprot_writecombine pgprot_writecombine 470 471 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 472 { 473 unsigned long prot = pgprot_val(_prot); 474 475 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 476 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 477 478 return __pgprot(prot); 479 } 480 481 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma, 482 unsigned long address) 483 { 484 } 485 486 #define __HAVE_ARCH_PTE_SAME 487 static inline int pte_same(pte_t pte_a, pte_t pte_b) 488 { 489 return pte_val(pte_a) == pte_val(pte_b); 490 } 491 492 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 493 static inline int ptep_set_access_flags(struct vm_area_struct *vma, 494 unsigned long address, pte_t *ptep, 495 pte_t entry, int dirty) 496 { 497 if (!pte_same(*ptep, entry)) 498 set_pte_at(vma->vm_mm, address, ptep, entry); 499 /* 500 * update_mmu_cache will unconditionally execute, handling both 501 * the case that the PTE changed and the spurious fault case. 502 */ 503 return true; 504 } 505 506 /* 507 * Conversion functions: convert a page and protection to a page entry, 508 * and a page entry and page directory to the page they refer to. 509 */ 510 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 511 512 #if defined(CONFIG_XPA) 513 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 514 { 515 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 516 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 517 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 518 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 519 return pte; 520 } 521 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 522 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 523 { 524 pte.pte_low &= _PAGE_CHG_MASK; 525 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 526 pte.pte_low |= pgprot_val(newprot); 527 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 528 return pte; 529 } 530 #else 531 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 532 { 533 pte_val(pte) &= _PAGE_CHG_MASK; 534 pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK; 535 if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ)) 536 pte_val(pte) |= _PAGE_SILENT_READ; 537 return pte; 538 } 539 #endif 540 541 542 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 543 pte_t pte); 544 545 static inline void update_mmu_cache(struct vm_area_struct *vma, 546 unsigned long address, pte_t *ptep) 547 { 548 pte_t pte = *ptep; 549 __update_tlb(vma, address, pte); 550 } 551 552 #define __HAVE_ARCH_UPDATE_MMU_TLB 553 #define update_mmu_tlb update_mmu_cache 554 555 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 556 unsigned long address, pmd_t *pmdp) 557 { 558 pte_t pte = *(pte_t *)pmdp; 559 560 __update_tlb(vma, address, pte); 561 } 562 563 #define kern_addr_valid(addr) (1) 564 565 /* 566 * Allow physical addresses to be fixed up to help 36-bit peripherals. 567 */ 568 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR 569 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size); 570 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, 571 unsigned long pfn, unsigned long size, pgprot_t prot); 572 #define io_remap_pfn_range io_remap_pfn_range 573 #else 574 #define fixup_bigphys_addr(addr, size) (addr) 575 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */ 576 577 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 578 579 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 580 #define pmdp_establish generic_pmdp_establish 581 582 #define has_transparent_hugepage has_transparent_hugepage 583 extern int has_transparent_hugepage(void); 584 585 static inline int pmd_trans_huge(pmd_t pmd) 586 { 587 return !!(pmd_val(pmd) & _PAGE_HUGE); 588 } 589 590 static inline pmd_t pmd_mkhuge(pmd_t pmd) 591 { 592 pmd_val(pmd) |= _PAGE_HUGE; 593 594 return pmd; 595 } 596 597 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 598 pmd_t *pmdp, pmd_t pmd); 599 600 #define pmd_write pmd_write 601 static inline int pmd_write(pmd_t pmd) 602 { 603 return !!(pmd_val(pmd) & _PAGE_WRITE); 604 } 605 606 static inline pmd_t pmd_wrprotect(pmd_t pmd) 607 { 608 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 609 return pmd; 610 } 611 612 static inline pmd_t pmd_mkwrite(pmd_t pmd) 613 { 614 pmd_val(pmd) |= _PAGE_WRITE; 615 if (pmd_val(pmd) & _PAGE_MODIFIED) 616 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 617 618 return pmd; 619 } 620 621 static inline int pmd_dirty(pmd_t pmd) 622 { 623 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 624 } 625 626 static inline pmd_t pmd_mkclean(pmd_t pmd) 627 { 628 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 629 return pmd; 630 } 631 632 static inline pmd_t pmd_mkdirty(pmd_t pmd) 633 { 634 pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY; 635 if (pmd_val(pmd) & _PAGE_WRITE) 636 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 637 638 return pmd; 639 } 640 641 static inline int pmd_young(pmd_t pmd) 642 { 643 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 644 } 645 646 static inline pmd_t pmd_mkold(pmd_t pmd) 647 { 648 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 649 650 return pmd; 651 } 652 653 static inline pmd_t pmd_mkyoung(pmd_t pmd) 654 { 655 pmd_val(pmd) |= _PAGE_ACCESSED; 656 657 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 658 pmd_val(pmd) |= _PAGE_SILENT_READ; 659 660 return pmd; 661 } 662 663 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 664 static inline int pmd_soft_dirty(pmd_t pmd) 665 { 666 return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY); 667 } 668 669 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 670 { 671 pmd_val(pmd) |= _PAGE_SOFT_DIRTY; 672 return pmd; 673 } 674 675 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 676 { 677 pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY); 678 return pmd; 679 } 680 681 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 682 683 /* Extern to avoid header file madness */ 684 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 685 686 static inline unsigned long pmd_pfn(pmd_t pmd) 687 { 688 return pmd_val(pmd) >> _PFN_SHIFT; 689 } 690 691 static inline struct page *pmd_page(pmd_t pmd) 692 { 693 if (pmd_trans_huge(pmd)) 694 return pfn_to_page(pmd_pfn(pmd)); 695 696 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 697 } 698 699 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 700 { 701 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) | 702 (pgprot_val(newprot) & ~_PAGE_CHG_MASK); 703 return pmd; 704 } 705 706 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 707 { 708 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 709 710 return pmd; 711 } 712 713 /* 714 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 715 * different prototype. 716 */ 717 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 718 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 719 unsigned long address, pmd_t *pmdp) 720 { 721 pmd_t old = *pmdp; 722 723 pmd_clear(pmdp); 724 725 return old; 726 } 727 728 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 729 730 #ifdef _PAGE_HUGE 731 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 732 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 733 #endif 734 735 #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) 736 737 /* 738 * We provide our own get_unmapped area to cope with the virtual aliasing 739 * constraints placed on us by the cache architecture. 740 */ 741 #define HAVE_ARCH_UNMAPPED_AREA 742 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 743 744 #endif /* _ASM_PGTABLE_H */ 745