1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 * 5 * Derived from MIPS: 6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle 7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. 8 */ 9 #ifndef _ASM_PGTABLE_H 10 #define _ASM_PGTABLE_H 11 12 #include <linux/compiler.h> 13 #include <asm/addrspace.h> 14 #include <asm/asm.h> 15 #include <asm/page.h> 16 #include <asm/pgtable-bits.h> 17 18 #if CONFIG_PGTABLE_LEVELS == 2 19 #include <asm-generic/pgtable-nopmd.h> 20 #elif CONFIG_PGTABLE_LEVELS == 3 21 #include <asm-generic/pgtable-nopud.h> 22 #else 23 #include <asm-generic/pgtable-nop4d.h> 24 #endif 25 26 #if CONFIG_PGTABLE_LEVELS == 2 27 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 28 #elif CONFIG_PGTABLE_LEVELS == 3 29 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 30 #define PMD_SIZE (1UL << PMD_SHIFT) 31 #define PMD_MASK (~(PMD_SIZE-1)) 32 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG)) 33 #elif CONFIG_PGTABLE_LEVELS == 4 34 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 35 #define PMD_SIZE (1UL << PMD_SHIFT) 36 #define PMD_MASK (~(PMD_SIZE-1)) 37 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG)) 38 #define PUD_SIZE (1UL << PUD_SHIFT) 39 #define PUD_MASK (~(PUD_SIZE-1)) 40 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - PTRLOG)) 41 #endif 42 43 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 44 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 45 46 #ifdef CONFIG_32BIT 47 #define VA_BITS 32 48 #else 49 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - PTRLOG)) 50 #endif 51 52 #define PTRS_PER_PGD (PAGE_SIZE >> PTRLOG) 53 #if CONFIG_PGTABLE_LEVELS > 3 54 #define PTRS_PER_PUD (PAGE_SIZE >> PTRLOG) 55 #endif 56 #if CONFIG_PGTABLE_LEVELS > 2 57 #define PTRS_PER_PMD (PAGE_SIZE >> PTRLOG) 58 #endif 59 #define PTRS_PER_PTE (PAGE_SIZE >> PTRLOG) 60 61 #ifdef CONFIG_32BIT 62 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) 63 #else 64 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 65 #endif 66 67 #ifndef __ASSEMBLER__ 68 69 #include <linux/mm_types.h> 70 #include <linux/mmzone.h> 71 #include <asm/fixmap.h> 72 #include <asm/sparsemem.h> 73 74 struct mm_struct; 75 struct vm_area_struct; 76 77 #ifdef CONFIG_32BIT 78 79 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 80 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE)) 81 82 #endif 83 84 #ifdef CONFIG_64BIT 85 86 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 87 #define MODULES_END (MODULES_VADDR + SZ_256M) 88 89 #ifdef CONFIG_KFENCE 90 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) 91 #else 92 #define KFENCE_AREA_SIZE 0 93 #endif 94 95 #define VMALLOC_START MODULES_END 96 97 #ifndef CONFIG_KASAN 98 #define VMALLOC_END \ 99 (vm_map_base + \ 100 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE) 101 #else 102 #define VMALLOC_END \ 103 (vm_map_base + \ 104 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE) 105 #endif 106 107 #define VMEMMAP_ALIGN max(PMD_SIZE, MAX_FOLIO_VMEMMAP_ALIGN) 108 #define vmemmap ((struct page *)(ALIGN(VMALLOC_END, VMEMMAP_ALIGN))) 109 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) 110 111 #define KFENCE_AREA_START (VMEMMAP_END + 1) 112 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) 113 114 #endif 115 116 #define ptep_get(ptep) READ_ONCE(*(ptep)) 117 #define pmdp_get(pmdp) READ_ONCE(*(pmdp)) 118 119 #define pte_ERROR(e) \ 120 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 121 #ifndef __PAGETABLE_PMD_FOLDED 122 #define pmd_ERROR(e) \ 123 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 124 #endif 125 #ifndef __PAGETABLE_PUD_FOLDED 126 #define pud_ERROR(e) \ 127 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 128 #endif 129 #define pgd_ERROR(e) \ 130 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 131 132 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 133 134 #ifndef __PAGETABLE_PUD_FOLDED 135 136 typedef struct { unsigned long pud; } pud_t; 137 #define pud_val(x) ((x).pud) 138 #define __pud(x) ((pud_t) { (x) }) 139 140 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 141 142 /* 143 * Empty pgd/p4d entries point to the invalid_pud_table. 144 */ 145 static inline int p4d_none(p4d_t p4d) 146 { 147 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 148 } 149 150 static inline int p4d_bad(p4d_t p4d) 151 { 152 return p4d_val(p4d) & ~PAGE_MASK; 153 } 154 155 static inline int p4d_present(p4d_t p4d) 156 { 157 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 158 } 159 160 static inline pud_t *p4d_pgtable(p4d_t p4d) 161 { 162 return (pud_t *)p4d_val(p4d); 163 } 164 165 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 166 { 167 WRITE_ONCE(*p4d, p4dval); 168 } 169 170 static inline void p4d_clear(p4d_t *p4dp) 171 { 172 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table)); 173 } 174 175 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 176 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 177 178 #endif 179 180 #ifndef __PAGETABLE_PMD_FOLDED 181 182 typedef struct { unsigned long pmd; } pmd_t; 183 #define pmd_val(x) ((x).pmd) 184 #define __pmd(x) ((pmd_t) { (x) }) 185 186 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 187 188 /* 189 * Empty pud entries point to the invalid_pmd_table. 190 */ 191 static inline int pud_none(pud_t pud) 192 { 193 return pud_val(pud) == (unsigned long)invalid_pmd_table; 194 } 195 196 static inline int pud_bad(pud_t pud) 197 { 198 return pud_val(pud) & ~PAGE_MASK; 199 } 200 201 static inline int pud_present(pud_t pud) 202 { 203 return pud_val(pud) != (unsigned long)invalid_pmd_table; 204 } 205 206 static inline pmd_t *pud_pgtable(pud_t pud) 207 { 208 return (pmd_t *)pud_val(pud); 209 } 210 211 static inline void set_pud(pud_t *pud, pud_t pudval) 212 { 213 WRITE_ONCE(*pud, pudval); 214 } 215 216 static inline void pud_clear(pud_t *pudp) 217 { 218 set_pud(pudp, __pud((unsigned long)invalid_pmd_table)); 219 } 220 221 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 222 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 223 224 #endif 225 226 /* 227 * Empty pmd entries point to the invalid_pte_table. 228 */ 229 static inline int pmd_none(pmd_t pmd) 230 { 231 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 232 } 233 234 static inline int pmd_bad(pmd_t pmd) 235 { 236 return (pmd_val(pmd) & ~PAGE_MASK); 237 } 238 239 static inline int pmd_present(pmd_t pmd) 240 { 241 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 242 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 243 244 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 245 } 246 247 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval) 248 { 249 WRITE_ONCE(*pmd, pmdval); 250 } 251 252 static inline void pmd_clear(pmd_t *pmdp) 253 { 254 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table)); 255 } 256 257 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 258 259 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 260 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 261 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 262 263 #define pmd_page_vaddr(pmd) pmd_val(pmd) 264 265 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 266 267 #define pte_page(x) pfn_to_page(pte_pfn(x)) 268 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 269 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 270 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 271 272 /* 273 * Initialize a new pgd / pud / pmd table with invalid pointers. 274 */ 275 extern void pgd_init(void *addr); 276 extern void pud_init(void *addr); 277 #define pud_init pud_init 278 extern void pmd_init(void *addr); 279 #define pmd_init pmd_init 280 extern void kernel_pte_init(void *addr); 281 #define kernel_pte_init kernel_pte_init 282 283 /* 284 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 285 * are !pte_none() && !pte_present(). 286 * 287 * Format of 32bit swap PTEs: 288 * 289 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 290 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 291 * <------------ offset -------------> E <- type -> <-- zeroes --> 292 * 293 * E is the exclusive marker that is not stored in swap entries. 294 * The zero'ed bits include _PAGE_PRESENT. 295 * 296 * Format of 64bit swap PTEs: 297 * 298 * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 299 * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 300 * <--------------------------- offset --------------------------- 301 * 302 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 303 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 304 * --------------> E <--- type ---> <---------- zeroes ----------> 305 * 306 * E is the exclusive marker that is not stored in swap entries. 307 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 308 */ 309 310 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7) 311 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) 312 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16) 313 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) 314 315 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 316 { 317 pte_t pte; 318 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT); 319 return pte; 320 } 321 322 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 323 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 324 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 325 326 #define __swp_entry_to_pte(x) __pte((x).val) 327 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE) 328 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 329 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 330 331 static inline bool pte_swp_exclusive(pte_t pte) 332 { 333 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 334 } 335 336 static inline pte_t pte_swp_mkexclusive(pte_t pte) 337 { 338 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 339 return pte; 340 } 341 342 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 343 { 344 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 345 return pte; 346 } 347 348 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 349 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 350 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 351 352 static inline void set_pte(pte_t *ptep, pte_t pteval) 353 { 354 WRITE_ONCE(*ptep, pteval); 355 356 #ifdef CONFIG_SMP 357 if (pte_val(pteval) & _PAGE_GLOBAL) 358 DBAR(0b11000); /* o_wrw = 0b11000 */ 359 #endif 360 } 361 362 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 363 { 364 pte_t pte = ptep_get(ptep); 365 pte_val(pte) &= _PAGE_GLOBAL; 366 set_pte(ptep, pte); 367 } 368 369 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 370 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 371 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 372 373 extern pgd_t swapper_pg_dir[]; 374 extern pgd_t invalid_pg_dir[]; 375 376 /* 377 * The following only work if pte_present() is true. 378 * Undefined behaviour if not.. 379 */ 380 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 381 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 382 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 383 384 static inline pte_t pte_mkold(pte_t pte) 385 { 386 pte_val(pte) &= ~_PAGE_ACCESSED; 387 return pte; 388 } 389 390 static inline pte_t pte_mkyoung(pte_t pte) 391 { 392 pte_val(pte) |= _PAGE_ACCESSED; 393 return pte; 394 } 395 396 static inline pte_t pte_mkclean(pte_t pte) 397 { 398 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 399 return pte; 400 } 401 402 static inline pte_t pte_mkdirty(pte_t pte) 403 { 404 pte_val(pte) |= _PAGE_MODIFIED; 405 if (pte_val(pte) & _PAGE_WRITE) 406 pte_val(pte) |= _PAGE_DIRTY; 407 return pte; 408 } 409 410 static inline pte_t pte_mkwrite_novma(pte_t pte) 411 { 412 pte_val(pte) |= _PAGE_WRITE; 413 if (pte_val(pte) & _PAGE_MODIFIED) 414 pte_val(pte) |= _PAGE_DIRTY; 415 return pte; 416 } 417 418 static inline pte_t pte_wrprotect(pte_t pte) 419 { 420 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 421 return pte; 422 } 423 424 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 } 431 432 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 433 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 434 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 435 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 436 437 #define pte_accessible pte_accessible 438 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 439 { 440 if (pte_val(a) & _PAGE_PRESENT) 441 return true; 442 443 if ((pte_val(a) & _PAGE_PROTNONE) && 444 atomic_read(&mm->tlb_flush_pending)) 445 return true; 446 447 return false; 448 } 449 450 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 451 { 452 if (pte_val(pte) & _PAGE_DIRTY) 453 pte_val(pte) |= _PAGE_MODIFIED; 454 455 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 456 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 457 } 458 459 extern void __update_tlb(struct vm_area_struct *vma, 460 unsigned long address, pte_t *ptep); 461 462 static inline void update_mmu_cache_range(struct vm_fault *vmf, 463 struct vm_area_struct *vma, unsigned long address, 464 pte_t *ptep, unsigned int nr) 465 { 466 for (;;) { 467 __update_tlb(vma, address, ptep); 468 if (--nr == 0) 469 break; 470 address += PAGE_SIZE; 471 ptep++; 472 } 473 } 474 #define update_mmu_cache(vma, addr, ptep) \ 475 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 476 477 #define update_mmu_tlb_range(vma, addr, ptep, nr) \ 478 update_mmu_cache_range(NULL, vma, addr, ptep, nr) 479 480 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 481 unsigned long address, pmd_t *pmdp) 482 { 483 __update_tlb(vma, address, (pte_t *)pmdp); 484 } 485 486 static inline unsigned long pmd_pfn(pmd_t pmd) 487 { 488 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 489 } 490 491 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 492 493 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 494 #define pmdp_establish generic_pmdp_establish 495 496 static inline int pmd_trans_huge(pmd_t pmd) 497 { 498 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 499 } 500 501 static inline pmd_t pmd_mkhuge(pmd_t pmd) 502 { 503 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 504 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 505 pmd_val(pmd) |= _PAGE_HUGE; 506 507 return pmd; 508 } 509 510 #define pmd_write pmd_write 511 static inline int pmd_write(pmd_t pmd) 512 { 513 return !!(pmd_val(pmd) & _PAGE_WRITE); 514 } 515 516 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 517 { 518 pmd_val(pmd) |= _PAGE_WRITE; 519 if (pmd_val(pmd) & _PAGE_MODIFIED) 520 pmd_val(pmd) |= _PAGE_DIRTY; 521 return pmd; 522 } 523 524 static inline pmd_t pmd_wrprotect(pmd_t pmd) 525 { 526 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 527 return pmd; 528 } 529 530 #define pmd_dirty pmd_dirty 531 static inline int pmd_dirty(pmd_t pmd) 532 { 533 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 534 } 535 536 static inline pmd_t pmd_mkclean(pmd_t pmd) 537 { 538 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 539 return pmd; 540 } 541 542 static inline pmd_t pmd_mkdirty(pmd_t pmd) 543 { 544 pmd_val(pmd) |= _PAGE_MODIFIED; 545 if (pmd_val(pmd) & _PAGE_WRITE) 546 pmd_val(pmd) |= _PAGE_DIRTY; 547 return pmd; 548 } 549 550 #define pmd_young pmd_young 551 static inline int pmd_young(pmd_t pmd) 552 { 553 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 554 } 555 556 static inline pmd_t pmd_mkold(pmd_t pmd) 557 { 558 pmd_val(pmd) &= ~_PAGE_ACCESSED; 559 return pmd; 560 } 561 562 static inline pmd_t pmd_mkyoung(pmd_t pmd) 563 { 564 pmd_val(pmd) |= _PAGE_ACCESSED; 565 return pmd; 566 } 567 568 static inline struct page *pmd_page(pmd_t pmd) 569 { 570 if (pmd_trans_huge(pmd)) 571 return pfn_to_page(pmd_pfn(pmd)); 572 573 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 574 } 575 576 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 577 { 578 if (pmd_val(pmd) & _PAGE_DIRTY) 579 pmd_val(pmd) |= _PAGE_MODIFIED; 580 581 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) | 582 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK)); 583 } 584 585 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 586 { 587 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 588 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 589 590 return pmd; 591 } 592 593 /* 594 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 595 * different prototype. 596 */ 597 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 598 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 599 unsigned long address, pmd_t *pmdp) 600 { 601 pmd_t old = pmdp_get(pmdp); 602 603 pmd_clear(pmdp); 604 605 return old; 606 } 607 608 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 609 610 #ifdef CONFIG_NUMA_BALANCING 611 static inline long pte_protnone(pte_t pte) 612 { 613 return (pte_val(pte) & _PAGE_PROTNONE); 614 } 615 616 static inline long pmd_protnone(pmd_t pmd) 617 { 618 return (pmd_val(pmd) & _PAGE_PROTNONE); 619 } 620 #endif /* CONFIG_NUMA_BALANCING */ 621 622 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 623 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 624 625 /* 626 * We provide our own get_unmapped area to cope with the virtual aliasing 627 * constraints placed on us by the cache architecture. 628 */ 629 #define HAVE_ARCH_UNMAPPED_AREA 630 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 631 632 #endif /* !__ASSEMBLER__ */ 633 634 #endif /* _ASM_PGTABLE_H */ 635