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 | _PAGE_NO_READ | \ 27 _page_cachable_default) 28 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 29 _page_cachable_default) 30 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \ 31 _page_cachable_default) 32 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | \ 33 _page_cachable_default) 34 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 35 _PAGE_GLOBAL | _page_cachable_default) 36 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 37 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) 38 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 39 _page_cachable_default) 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_R3000) && !defined(CONFIG_CPU_TX39XX) 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 #ifdef CONFIG_SMP 208 /* 209 * For SMP, multiple CPUs can race, so we need to do 210 * this atomically. 211 */ 212 unsigned long page_global = _PAGE_GLOBAL; 213 unsigned long tmp; 214 215 if (kernel_uses_llsc && R10000_LLSC_WAR) { 216 __asm__ __volatile__ ( 217 " .set push \n" 218 " .set arch=r4000 \n" 219 " .set noreorder \n" 220 "1:" __LL "%[tmp], %[buddy] \n" 221 " bnez %[tmp], 2f \n" 222 " or %[tmp], %[tmp], %[global] \n" 223 __SC "%[tmp], %[buddy] \n" 224 " beqzl %[tmp], 1b \n" 225 " nop \n" 226 "2: \n" 227 " .set pop \n" 228 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) 229 : [global] "r" (page_global)); 230 } else if (kernel_uses_llsc) { 231 __asm__ __volatile__ ( 232 " .set push \n" 233 " .set "MIPS_ISA_ARCH_LEVEL" \n" 234 " .set noreorder \n" 235 "1:" __LL "%[tmp], %[buddy] \n" 236 " bnez %[tmp], 2f \n" 237 " or %[tmp], %[tmp], %[global] \n" 238 __SC "%[tmp], %[buddy] \n" 239 " beqz %[tmp], 1b \n" 240 " nop \n" 241 "2: \n" 242 " .set pop \n" 243 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) 244 : [global] "r" (page_global)); 245 } 246 #else /* !CONFIG_SMP */ 247 if (pte_none(*buddy)) 248 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 249 #endif /* CONFIG_SMP */ 250 } 251 #endif 252 } 253 254 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 255 { 256 htw_stop(); 257 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 258 /* Preserve global status for the pair */ 259 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 260 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 261 else 262 #endif 263 set_pte_at(mm, addr, ptep, __pte(0)); 264 htw_start(); 265 } 266 #endif 267 268 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 269 pte_t *ptep, pte_t pteval) 270 { 271 extern void __update_cache(unsigned long address, pte_t pte); 272 273 if (!pte_present(pteval)) 274 goto cache_sync_done; 275 276 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval))) 277 goto cache_sync_done; 278 279 __update_cache(addr, pteval); 280 cache_sync_done: 281 set_pte(ptep, pteval); 282 } 283 284 /* 285 * (pmds are folded into puds so this doesn't get actually called, 286 * but the define is needed for a generic inline function.) 287 */ 288 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 289 290 #ifndef __PAGETABLE_PMD_FOLDED 291 /* 292 * (puds are folded into pgds so this doesn't get actually called, 293 * but the define is needed for a generic inline function.) 294 */ 295 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 296 #endif 297 298 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 299 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 300 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 301 302 /* 303 * We used to declare this array with size but gcc 3.3 and older are not able 304 * to find that this expression is a constant, so the size is dropped. 305 */ 306 extern pgd_t swapper_pg_dir[]; 307 308 /* 309 * The following only work if pte_present() is true. 310 * Undefined behaviour if not.. 311 */ 312 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 313 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 314 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 315 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 316 317 static inline pte_t pte_wrprotect(pte_t pte) 318 { 319 pte.pte_low &= ~_PAGE_WRITE; 320 if (!IS_ENABLED(CONFIG_XPA)) 321 pte.pte_low &= ~_PAGE_SILENT_WRITE; 322 pte.pte_high &= ~_PAGE_SILENT_WRITE; 323 return pte; 324 } 325 326 static inline pte_t pte_mkclean(pte_t pte) 327 { 328 pte.pte_low &= ~_PAGE_MODIFIED; 329 if (!IS_ENABLED(CONFIG_XPA)) 330 pte.pte_low &= ~_PAGE_SILENT_WRITE; 331 pte.pte_high &= ~_PAGE_SILENT_WRITE; 332 return pte; 333 } 334 335 static inline pte_t pte_mkold(pte_t pte) 336 { 337 pte.pte_low &= ~_PAGE_ACCESSED; 338 if (!IS_ENABLED(CONFIG_XPA)) 339 pte.pte_low &= ~_PAGE_SILENT_READ; 340 pte.pte_high &= ~_PAGE_SILENT_READ; 341 return pte; 342 } 343 344 static inline pte_t pte_mkwrite(pte_t pte) 345 { 346 pte.pte_low |= _PAGE_WRITE; 347 if (pte.pte_low & _PAGE_MODIFIED) { 348 if (!IS_ENABLED(CONFIG_XPA)) 349 pte.pte_low |= _PAGE_SILENT_WRITE; 350 pte.pte_high |= _PAGE_SILENT_WRITE; 351 } 352 return pte; 353 } 354 355 static inline pte_t pte_mkdirty(pte_t pte) 356 { 357 pte.pte_low |= _PAGE_MODIFIED; 358 if (pte.pte_low & _PAGE_WRITE) { 359 if (!IS_ENABLED(CONFIG_XPA)) 360 pte.pte_low |= _PAGE_SILENT_WRITE; 361 pte.pte_high |= _PAGE_SILENT_WRITE; 362 } 363 return pte; 364 } 365 366 static inline pte_t pte_mkyoung(pte_t pte) 367 { 368 pte.pte_low |= _PAGE_ACCESSED; 369 if (!(pte.pte_low & _PAGE_NO_READ)) { 370 if (!IS_ENABLED(CONFIG_XPA)) 371 pte.pte_low |= _PAGE_SILENT_READ; 372 pte.pte_high |= _PAGE_SILENT_READ; 373 } 374 return pte; 375 } 376 #else 377 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 378 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 379 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 380 381 static inline pte_t pte_wrprotect(pte_t pte) 382 { 383 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 384 return pte; 385 } 386 387 static inline pte_t pte_mkclean(pte_t pte) 388 { 389 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 390 return pte; 391 } 392 393 static inline pte_t pte_mkold(pte_t pte) 394 { 395 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 396 return pte; 397 } 398 399 static inline pte_t pte_mkwrite(pte_t pte) 400 { 401 pte_val(pte) |= _PAGE_WRITE; 402 if (pte_val(pte) & _PAGE_MODIFIED) 403 pte_val(pte) |= _PAGE_SILENT_WRITE; 404 return pte; 405 } 406 407 static inline pte_t pte_mkdirty(pte_t pte) 408 { 409 pte_val(pte) |= _PAGE_MODIFIED; 410 if (pte_val(pte) & _PAGE_WRITE) 411 pte_val(pte) |= _PAGE_SILENT_WRITE; 412 return pte; 413 } 414 415 static inline pte_t pte_mkyoung(pte_t pte) 416 { 417 pte_val(pte) |= _PAGE_ACCESSED; 418 if (!(pte_val(pte) & _PAGE_NO_READ)) 419 pte_val(pte) |= _PAGE_SILENT_READ; 420 return pte; 421 } 422 423 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 424 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 425 426 static inline pte_t pte_mkhuge(pte_t pte) 427 { 428 pte_val(pte) |= _PAGE_HUGE; 429 return pte; 430 } 431 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 432 #endif 433 static inline int pte_special(pte_t pte) { return 0; } 434 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 435 436 /* 437 * Macro to make mark a page protection value as "uncacheable". Note 438 * that "protection" is really a misnomer here as the protection value 439 * contains the memory attribute bits, dirty bits, and various other 440 * bits as well. 441 */ 442 #define pgprot_noncached pgprot_noncached 443 444 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 445 { 446 unsigned long prot = pgprot_val(_prot); 447 448 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 449 450 return __pgprot(prot); 451 } 452 453 #define pgprot_writecombine pgprot_writecombine 454 455 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 456 { 457 unsigned long prot = pgprot_val(_prot); 458 459 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 460 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 461 462 return __pgprot(prot); 463 } 464 465 /* 466 * Conversion functions: convert a page and protection to a page entry, 467 * and a page entry and page directory to the page they refer to. 468 */ 469 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 470 471 #if defined(CONFIG_XPA) 472 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 473 { 474 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 475 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 476 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 477 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 478 return pte; 479 } 480 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 481 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 482 { 483 pte.pte_low &= _PAGE_CHG_MASK; 484 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 485 pte.pte_low |= pgprot_val(newprot); 486 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); 487 return pte; 488 } 489 #else 490 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 491 { 492 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 493 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 494 } 495 #endif 496 497 498 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 499 pte_t pte); 500 501 static inline void update_mmu_cache(struct vm_area_struct *vma, 502 unsigned long address, pte_t *ptep) 503 { 504 pte_t pte = *ptep; 505 __update_tlb(vma, address, pte); 506 } 507 508 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 509 unsigned long address, pmd_t *pmdp) 510 { 511 pte_t pte = *(pte_t *)pmdp; 512 513 __update_tlb(vma, address, pte); 514 } 515 516 #define kern_addr_valid(addr) (1) 517 518 #ifdef CONFIG_PHYS_ADDR_T_64BIT 519 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 520 521 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 522 unsigned long vaddr, 523 unsigned long pfn, 524 unsigned long size, 525 pgprot_t prot) 526 { 527 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 528 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 529 } 530 #define io_remap_pfn_range io_remap_pfn_range 531 #endif 532 533 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 534 535 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 536 #define pmdp_establish generic_pmdp_establish 537 538 #define has_transparent_hugepage has_transparent_hugepage 539 extern int has_transparent_hugepage(void); 540 541 static inline int pmd_trans_huge(pmd_t pmd) 542 { 543 return !!(pmd_val(pmd) & _PAGE_HUGE); 544 } 545 546 static inline pmd_t pmd_mkhuge(pmd_t pmd) 547 { 548 pmd_val(pmd) |= _PAGE_HUGE; 549 550 return pmd; 551 } 552 553 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 554 pmd_t *pmdp, pmd_t pmd); 555 556 #define pmd_write pmd_write 557 static inline int pmd_write(pmd_t pmd) 558 { 559 return !!(pmd_val(pmd) & _PAGE_WRITE); 560 } 561 562 static inline pmd_t pmd_wrprotect(pmd_t pmd) 563 { 564 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 565 return pmd; 566 } 567 568 static inline pmd_t pmd_mkwrite(pmd_t pmd) 569 { 570 pmd_val(pmd) |= _PAGE_WRITE; 571 if (pmd_val(pmd) & _PAGE_MODIFIED) 572 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 573 574 return pmd; 575 } 576 577 static inline int pmd_dirty(pmd_t pmd) 578 { 579 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 580 } 581 582 static inline pmd_t pmd_mkclean(pmd_t pmd) 583 { 584 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 585 return pmd; 586 } 587 588 static inline pmd_t pmd_mkdirty(pmd_t pmd) 589 { 590 pmd_val(pmd) |= _PAGE_MODIFIED; 591 if (pmd_val(pmd) & _PAGE_WRITE) 592 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 593 594 return pmd; 595 } 596 597 static inline int pmd_young(pmd_t pmd) 598 { 599 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 600 } 601 602 static inline pmd_t pmd_mkold(pmd_t pmd) 603 { 604 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 605 606 return pmd; 607 } 608 609 static inline pmd_t pmd_mkyoung(pmd_t pmd) 610 { 611 pmd_val(pmd) |= _PAGE_ACCESSED; 612 613 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 614 pmd_val(pmd) |= _PAGE_SILENT_READ; 615 616 return pmd; 617 } 618 619 /* Extern to avoid header file madness */ 620 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 621 622 static inline unsigned long pmd_pfn(pmd_t pmd) 623 { 624 return pmd_val(pmd) >> _PFN_SHIFT; 625 } 626 627 static inline struct page *pmd_page(pmd_t pmd) 628 { 629 if (pmd_trans_huge(pmd)) 630 return pfn_to_page(pmd_pfn(pmd)); 631 632 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 633 } 634 635 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 636 { 637 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) | 638 (pgprot_val(newprot) & ~_PAGE_CHG_MASK); 639 return pmd; 640 } 641 642 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 643 { 644 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 645 646 return pmd; 647 } 648 649 /* 650 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 651 * different prototype. 652 */ 653 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 654 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 655 unsigned long address, pmd_t *pmdp) 656 { 657 pmd_t old = *pmdp; 658 659 pmd_clear(pmdp); 660 661 return old; 662 } 663 664 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 665 666 #include <asm-generic/pgtable.h> 667 668 /* 669 * uncached accelerated TLB map for video memory access 670 */ 671 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 672 #define __HAVE_PHYS_MEM_ACCESS_PROT 673 674 struct file; 675 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 676 unsigned long size, pgprot_t vma_prot); 677 #endif 678 679 /* 680 * We provide our own get_unmapped area to cope with the virtual aliasing 681 * constraints placed on us by the cache architecture. 682 */ 683 #define HAVE_ARCH_UNMAPPED_AREA 684 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 685 686 /* 687 * No page table caches to initialise 688 */ 689 #define pgtable_cache_init() do { } while (0) 690 691 #endif /* _ASM_PGTABLE_H */ 692