1 #ifndef _ASM_X86_PGTABLE_H 2 #define _ASM_X86_PGTABLE_H 3 4 #include <asm/page.h> 5 #include <asm/e820.h> 6 7 #include <asm/pgtable_types.h> 8 9 /* 10 * Macro to mark a page protection value as UC- 11 */ 12 #define pgprot_noncached(prot) \ 13 ((boot_cpu_data.x86 > 3) \ 14 ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \ 15 : (prot)) 16 17 #ifndef __ASSEMBLY__ 18 19 #include <asm/x86_init.h> 20 21 /* 22 * ZERO_PAGE is a global shared page that is always zero: used 23 * for zero-mapped memory areas etc.. 24 */ 25 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 26 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 27 28 extern spinlock_t pgd_lock; 29 extern struct list_head pgd_list; 30 31 #ifdef CONFIG_PARAVIRT 32 #include <asm/paravirt.h> 33 #else /* !CONFIG_PARAVIRT */ 34 #define set_pte(ptep, pte) native_set_pte(ptep, pte) 35 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) 36 37 #define set_pte_atomic(ptep, pte) \ 38 native_set_pte_atomic(ptep, pte) 39 40 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) 41 42 #ifndef __PAGETABLE_PUD_FOLDED 43 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) 44 #define pgd_clear(pgd) native_pgd_clear(pgd) 45 #endif 46 47 #ifndef set_pud 48 # define set_pud(pudp, pud) native_set_pud(pudp, pud) 49 #endif 50 51 #ifndef __PAGETABLE_PMD_FOLDED 52 #define pud_clear(pud) native_pud_clear(pud) 53 #endif 54 55 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) 56 #define pmd_clear(pmd) native_pmd_clear(pmd) 57 58 #define pte_update(mm, addr, ptep) do { } while (0) 59 #define pte_update_defer(mm, addr, ptep) do { } while (0) 60 61 #define pgd_val(x) native_pgd_val(x) 62 #define __pgd(x) native_make_pgd(x) 63 64 #ifndef __PAGETABLE_PUD_FOLDED 65 #define pud_val(x) native_pud_val(x) 66 #define __pud(x) native_make_pud(x) 67 #endif 68 69 #ifndef __PAGETABLE_PMD_FOLDED 70 #define pmd_val(x) native_pmd_val(x) 71 #define __pmd(x) native_make_pmd(x) 72 #endif 73 74 #define pte_val(x) native_pte_val(x) 75 #define __pte(x) native_make_pte(x) 76 77 #define arch_end_context_switch(prev) do {} while(0) 78 79 #endif /* CONFIG_PARAVIRT */ 80 81 /* 82 * The following only work if pte_present() is true. 83 * Undefined behaviour if not.. 84 */ 85 static inline int pte_dirty(pte_t pte) 86 { 87 return pte_flags(pte) & _PAGE_DIRTY; 88 } 89 90 static inline int pte_young(pte_t pte) 91 { 92 return pte_flags(pte) & _PAGE_ACCESSED; 93 } 94 95 static inline int pte_write(pte_t pte) 96 { 97 return pte_flags(pte) & _PAGE_RW; 98 } 99 100 static inline int pte_file(pte_t pte) 101 { 102 return pte_flags(pte) & _PAGE_FILE; 103 } 104 105 static inline int pte_huge(pte_t pte) 106 { 107 return pte_flags(pte) & _PAGE_PSE; 108 } 109 110 static inline int pte_global(pte_t pte) 111 { 112 return pte_flags(pte) & _PAGE_GLOBAL; 113 } 114 115 static inline int pte_exec(pte_t pte) 116 { 117 return !(pte_flags(pte) & _PAGE_NX); 118 } 119 120 static inline int pte_special(pte_t pte) 121 { 122 return pte_flags(pte) & _PAGE_SPECIAL; 123 } 124 125 static inline unsigned long pte_pfn(pte_t pte) 126 { 127 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; 128 } 129 130 static inline unsigned long pmd_pfn(pmd_t pmd) 131 { 132 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT; 133 } 134 135 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 136 137 static inline int pmd_large(pmd_t pte) 138 { 139 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) == 140 (_PAGE_PSE | _PAGE_PRESENT); 141 } 142 143 static inline pte_t pte_set_flags(pte_t pte, pteval_t set) 144 { 145 pteval_t v = native_pte_val(pte); 146 147 return native_make_pte(v | set); 148 } 149 150 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear) 151 { 152 pteval_t v = native_pte_val(pte); 153 154 return native_make_pte(v & ~clear); 155 } 156 157 static inline pte_t pte_mkclean(pte_t pte) 158 { 159 return pte_clear_flags(pte, _PAGE_DIRTY); 160 } 161 162 static inline pte_t pte_mkold(pte_t pte) 163 { 164 return pte_clear_flags(pte, _PAGE_ACCESSED); 165 } 166 167 static inline pte_t pte_wrprotect(pte_t pte) 168 { 169 return pte_clear_flags(pte, _PAGE_RW); 170 } 171 172 static inline pte_t pte_mkexec(pte_t pte) 173 { 174 return pte_clear_flags(pte, _PAGE_NX); 175 } 176 177 static inline pte_t pte_mkdirty(pte_t pte) 178 { 179 return pte_set_flags(pte, _PAGE_DIRTY); 180 } 181 182 static inline pte_t pte_mkyoung(pte_t pte) 183 { 184 return pte_set_flags(pte, _PAGE_ACCESSED); 185 } 186 187 static inline pte_t pte_mkwrite(pte_t pte) 188 { 189 return pte_set_flags(pte, _PAGE_RW); 190 } 191 192 static inline pte_t pte_mkhuge(pte_t pte) 193 { 194 return pte_set_flags(pte, _PAGE_PSE); 195 } 196 197 static inline pte_t pte_clrhuge(pte_t pte) 198 { 199 return pte_clear_flags(pte, _PAGE_PSE); 200 } 201 202 static inline pte_t pte_mkglobal(pte_t pte) 203 { 204 return pte_set_flags(pte, _PAGE_GLOBAL); 205 } 206 207 static inline pte_t pte_clrglobal(pte_t pte) 208 { 209 return pte_clear_flags(pte, _PAGE_GLOBAL); 210 } 211 212 static inline pte_t pte_mkspecial(pte_t pte) 213 { 214 return pte_set_flags(pte, _PAGE_SPECIAL); 215 } 216 217 /* 218 * Mask out unsupported bits in a present pgprot. Non-present pgprots 219 * can use those bits for other purposes, so leave them be. 220 */ 221 static inline pgprotval_t massage_pgprot(pgprot_t pgprot) 222 { 223 pgprotval_t protval = pgprot_val(pgprot); 224 225 if (protval & _PAGE_PRESENT) 226 protval &= __supported_pte_mask; 227 228 return protval; 229 } 230 231 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 232 { 233 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | 234 massage_pgprot(pgprot)); 235 } 236 237 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 238 { 239 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | 240 massage_pgprot(pgprot)); 241 } 242 243 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 244 { 245 pteval_t val = pte_val(pte); 246 247 /* 248 * Chop off the NX bit (if present), and add the NX portion of 249 * the newprot (if present): 250 */ 251 val &= _PAGE_CHG_MASK; 252 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK; 253 254 return __pte(val); 255 } 256 257 /* mprotect needs to preserve PAT bits when updating vm_page_prot */ 258 #define pgprot_modify pgprot_modify 259 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) 260 { 261 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; 262 pgprotval_t addbits = pgprot_val(newprot); 263 return __pgprot(preservebits | addbits); 264 } 265 266 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK) 267 268 #define canon_pgprot(p) __pgprot(massage_pgprot(p)) 269 270 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, 271 unsigned long flags, 272 unsigned long new_flags) 273 { 274 /* 275 * PAT type is always WB for untracked ranges, so no need to check. 276 */ 277 if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) 278 return 1; 279 280 /* 281 * Certain new memtypes are not allowed with certain 282 * requested memtype: 283 * - request is uncached, return cannot be write-back 284 * - request is write-combine, return cannot be write-back 285 */ 286 if ((flags == _PAGE_CACHE_UC_MINUS && 287 new_flags == _PAGE_CACHE_WB) || 288 (flags == _PAGE_CACHE_WC && 289 new_flags == _PAGE_CACHE_WB)) { 290 return 0; 291 } 292 293 return 1; 294 } 295 296 pmd_t *populate_extra_pmd(unsigned long vaddr); 297 pte_t *populate_extra_pte(unsigned long vaddr); 298 #endif /* __ASSEMBLY__ */ 299 300 #ifdef CONFIG_X86_32 301 # include "pgtable_32.h" 302 #else 303 # include "pgtable_64.h" 304 #endif 305 306 #ifndef __ASSEMBLY__ 307 #include <linux/mm_types.h> 308 309 static inline int pte_none(pte_t pte) 310 { 311 return !pte.pte; 312 } 313 314 #define __HAVE_ARCH_PTE_SAME 315 static inline int pte_same(pte_t a, pte_t b) 316 { 317 return a.pte == b.pte; 318 } 319 320 static inline int pte_present(pte_t a) 321 { 322 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); 323 } 324 325 static inline int pte_hidden(pte_t pte) 326 { 327 return pte_flags(pte) & _PAGE_HIDDEN; 328 } 329 330 static inline int pmd_present(pmd_t pmd) 331 { 332 return pmd_flags(pmd) & _PAGE_PRESENT; 333 } 334 335 static inline int pmd_none(pmd_t pmd) 336 { 337 /* Only check low word on 32-bit platforms, since it might be 338 out of sync with upper half. */ 339 return (unsigned long)native_pmd_val(pmd) == 0; 340 } 341 342 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 343 { 344 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK); 345 } 346 347 /* 348 * Currently stuck as a macro due to indirect forward reference to 349 * linux/mmzone.h's __section_mem_map_addr() definition: 350 */ 351 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) 352 353 /* 354 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] 355 * 356 * this macro returns the index of the entry in the pmd page which would 357 * control the given virtual address 358 */ 359 static inline unsigned long pmd_index(unsigned long address) 360 { 361 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); 362 } 363 364 /* 365 * Conversion functions: convert a page and protection to a page entry, 366 * and a page entry and page directory to the page they refer to. 367 * 368 * (Currently stuck as a macro because of indirect forward reference 369 * to linux/mm.h:page_to_nid()) 370 */ 371 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 372 373 /* 374 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] 375 * 376 * this function returns the index of the entry in the pte page which would 377 * control the given virtual address 378 */ 379 static inline unsigned long pte_index(unsigned long address) 380 { 381 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); 382 } 383 384 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) 385 { 386 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); 387 } 388 389 static inline int pmd_bad(pmd_t pmd) 390 { 391 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; 392 } 393 394 static inline unsigned long pages_to_mb(unsigned long npg) 395 { 396 return npg >> (20 - PAGE_SHIFT); 397 } 398 399 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 400 remap_pfn_range(vma, vaddr, pfn, size, prot) 401 402 #if PAGETABLE_LEVELS > 2 403 static inline int pud_none(pud_t pud) 404 { 405 return native_pud_val(pud) == 0; 406 } 407 408 static inline int pud_present(pud_t pud) 409 { 410 return pud_flags(pud) & _PAGE_PRESENT; 411 } 412 413 static inline unsigned long pud_page_vaddr(pud_t pud) 414 { 415 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK); 416 } 417 418 /* 419 * Currently stuck as a macro due to indirect forward reference to 420 * linux/mmzone.h's __section_mem_map_addr() definition: 421 */ 422 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT) 423 424 /* Find an entry in the second-level page table.. */ 425 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 426 { 427 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); 428 } 429 430 static inline int pud_large(pud_t pud) 431 { 432 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == 433 (_PAGE_PSE | _PAGE_PRESENT); 434 } 435 436 static inline int pud_bad(pud_t pud) 437 { 438 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; 439 } 440 #else 441 static inline int pud_large(pud_t pud) 442 { 443 return 0; 444 } 445 #endif /* PAGETABLE_LEVELS > 2 */ 446 447 #if PAGETABLE_LEVELS > 3 448 static inline int pgd_present(pgd_t pgd) 449 { 450 return pgd_flags(pgd) & _PAGE_PRESENT; 451 } 452 453 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 454 { 455 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); 456 } 457 458 /* 459 * Currently stuck as a macro due to indirect forward reference to 460 * linux/mmzone.h's __section_mem_map_addr() definition: 461 */ 462 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT) 463 464 /* to find an entry in a page-table-directory. */ 465 static inline unsigned long pud_index(unsigned long address) 466 { 467 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); 468 } 469 470 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) 471 { 472 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address); 473 } 474 475 static inline int pgd_bad(pgd_t pgd) 476 { 477 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE; 478 } 479 480 static inline int pgd_none(pgd_t pgd) 481 { 482 return !native_pgd_val(pgd); 483 } 484 #endif /* PAGETABLE_LEVELS > 3 */ 485 486 #endif /* __ASSEMBLY__ */ 487 488 /* 489 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] 490 * 491 * this macro returns the index of the entry in the pgd page which would 492 * control the given virtual address 493 */ 494 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 495 496 /* 497 * pgd_offset() returns a (pgd_t *) 498 * pgd_index() is used get the offset into the pgd page's array of pgd_t's; 499 */ 500 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address))) 501 /* 502 * a shortcut which implies the use of the kernel's pgd, instead 503 * of a process's 504 */ 505 #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) 506 507 508 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) 509 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) 510 511 #ifndef __ASSEMBLY__ 512 513 extern int direct_gbpages; 514 515 /* local pte updates need not use xchg for locking */ 516 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) 517 { 518 pte_t res = *ptep; 519 520 /* Pure native function needs no input for mm, addr */ 521 native_pte_clear(NULL, 0, ptep); 522 return res; 523 } 524 525 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, 526 pte_t *ptep , pte_t pte) 527 { 528 native_set_pte(ptep, pte); 529 } 530 531 #ifndef CONFIG_PARAVIRT 532 /* 533 * Rules for using pte_update - it must be called after any PTE update which 534 * has not been done using the set_pte / clear_pte interfaces. It is used by 535 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE 536 * updates should either be sets, clears, or set_pte_atomic for P->P 537 * transitions, which means this hook should only be called for user PTEs. 538 * This hook implies a P->P protection or access change has taken place, which 539 * requires a subsequent TLB flush. The notification can optionally be delayed 540 * until the TLB flush event by using the pte_update_defer form of the 541 * interface, but care must be taken to assure that the flush happens while 542 * still holding the same page table lock so that the shadow and primary pages 543 * do not become out of sync on SMP. 544 */ 545 #define pte_update(mm, addr, ptep) do { } while (0) 546 #define pte_update_defer(mm, addr, ptep) do { } while (0) 547 #endif 548 549 /* 550 * We only update the dirty/accessed state if we set 551 * the dirty bit by hand in the kernel, since the hardware 552 * will do the accessed bit for us, and we don't want to 553 * race with other CPU's that might be updating the dirty 554 * bit at the same time. 555 */ 556 struct vm_area_struct; 557 558 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 559 extern int ptep_set_access_flags(struct vm_area_struct *vma, 560 unsigned long address, pte_t *ptep, 561 pte_t entry, int dirty); 562 563 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 564 extern int ptep_test_and_clear_young(struct vm_area_struct *vma, 565 unsigned long addr, pte_t *ptep); 566 567 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 568 extern int ptep_clear_flush_young(struct vm_area_struct *vma, 569 unsigned long address, pte_t *ptep); 570 571 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 572 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 573 pte_t *ptep) 574 { 575 pte_t pte = native_ptep_get_and_clear(ptep); 576 pte_update(mm, addr, ptep); 577 return pte; 578 } 579 580 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 581 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 582 unsigned long addr, pte_t *ptep, 583 int full) 584 { 585 pte_t pte; 586 if (full) { 587 /* 588 * Full address destruction in progress; paravirt does not 589 * care about updates and native needs no locking 590 */ 591 pte = native_local_ptep_get_and_clear(ptep); 592 } else { 593 pte = ptep_get_and_clear(mm, addr, ptep); 594 } 595 return pte; 596 } 597 598 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 599 static inline void ptep_set_wrprotect(struct mm_struct *mm, 600 unsigned long addr, pte_t *ptep) 601 { 602 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); 603 pte_update(mm, addr, ptep); 604 } 605 606 /* 607 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); 608 * 609 * dst - pointer to pgd range anwhere on a pgd page 610 * src - "" 611 * count - the number of pgds to copy. 612 * 613 * dst and src can be on the same page, but the range must not overlap, 614 * and must not cross a page boundary. 615 */ 616 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) 617 { 618 memcpy(dst, src, count * sizeof(pgd_t)); 619 } 620 621 622 #include <asm-generic/pgtable.h> 623 #endif /* __ASSEMBLY__ */ 624 625 #endif /* _ASM_X86_PGTABLE_H */ 626