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 /* 78 * ZERO_PAGE is a global shared page that is always zero; used 79 * for zero-mapped memory areas etc.. 80 */ 81 82 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 83 84 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) 85 86 #ifdef CONFIG_32BIT 87 88 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 89 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE)) 90 91 #endif 92 93 #ifdef CONFIG_64BIT 94 95 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 96 #define MODULES_END (MODULES_VADDR + SZ_256M) 97 98 #ifdef CONFIG_KFENCE 99 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) 100 #else 101 #define KFENCE_AREA_SIZE 0 102 #endif 103 104 #define VMALLOC_START MODULES_END 105 106 #ifndef CONFIG_KASAN 107 #define VMALLOC_END \ 108 (vm_map_base + \ 109 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) 110 #else 111 #define VMALLOC_END \ 112 (vm_map_base + \ 113 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) 114 #endif 115 116 #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK)) 117 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) 118 119 #define KFENCE_AREA_START (VMEMMAP_END + 1) 120 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) 121 122 #endif 123 124 #define ptep_get(ptep) READ_ONCE(*(ptep)) 125 #define pmdp_get(pmdp) READ_ONCE(*(pmdp)) 126 127 #define pte_ERROR(e) \ 128 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 129 #ifndef __PAGETABLE_PMD_FOLDED 130 #define pmd_ERROR(e) \ 131 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 132 #endif 133 #ifndef __PAGETABLE_PUD_FOLDED 134 #define pud_ERROR(e) \ 135 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 136 #endif 137 #define pgd_ERROR(e) \ 138 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 139 140 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 141 142 #ifndef __PAGETABLE_PUD_FOLDED 143 144 typedef struct { unsigned long pud; } pud_t; 145 #define pud_val(x) ((x).pud) 146 #define __pud(x) ((pud_t) { (x) }) 147 148 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 149 150 /* 151 * Empty pgd/p4d entries point to the invalid_pud_table. 152 */ 153 static inline int p4d_none(p4d_t p4d) 154 { 155 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 156 } 157 158 static inline int p4d_bad(p4d_t p4d) 159 { 160 return p4d_val(p4d) & ~PAGE_MASK; 161 } 162 163 static inline int p4d_present(p4d_t p4d) 164 { 165 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 166 } 167 168 static inline pud_t *p4d_pgtable(p4d_t p4d) 169 { 170 return (pud_t *)p4d_val(p4d); 171 } 172 173 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 174 { 175 WRITE_ONCE(*p4d, p4dval); 176 } 177 178 static inline void p4d_clear(p4d_t *p4dp) 179 { 180 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table)); 181 } 182 183 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 184 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 185 186 #endif 187 188 #ifndef __PAGETABLE_PMD_FOLDED 189 190 typedef struct { unsigned long pmd; } pmd_t; 191 #define pmd_val(x) ((x).pmd) 192 #define __pmd(x) ((pmd_t) { (x) }) 193 194 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 195 196 /* 197 * Empty pud entries point to the invalid_pmd_table. 198 */ 199 static inline int pud_none(pud_t pud) 200 { 201 return pud_val(pud) == (unsigned long)invalid_pmd_table; 202 } 203 204 static inline int pud_bad(pud_t pud) 205 { 206 return pud_val(pud) & ~PAGE_MASK; 207 } 208 209 static inline int pud_present(pud_t pud) 210 { 211 return pud_val(pud) != (unsigned long)invalid_pmd_table; 212 } 213 214 static inline pmd_t *pud_pgtable(pud_t pud) 215 { 216 return (pmd_t *)pud_val(pud); 217 } 218 219 static inline void set_pud(pud_t *pud, pud_t pudval) 220 { 221 WRITE_ONCE(*pud, pudval); 222 } 223 224 static inline void pud_clear(pud_t *pudp) 225 { 226 set_pud(pudp, __pud((unsigned long)invalid_pmd_table)); 227 } 228 229 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 230 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 231 232 #endif 233 234 /* 235 * Empty pmd entries point to the invalid_pte_table. 236 */ 237 static inline int pmd_none(pmd_t pmd) 238 { 239 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 240 } 241 242 static inline int pmd_bad(pmd_t pmd) 243 { 244 return (pmd_val(pmd) & ~PAGE_MASK); 245 } 246 247 static inline int pmd_present(pmd_t pmd) 248 { 249 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 250 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 251 252 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 253 } 254 255 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval) 256 { 257 WRITE_ONCE(*pmd, pmdval); 258 } 259 260 static inline void pmd_clear(pmd_t *pmdp) 261 { 262 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table)); 263 } 264 265 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 266 267 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 268 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 269 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 270 271 #define pmd_page_vaddr(pmd) pmd_val(pmd) 272 273 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 274 275 #define pte_page(x) pfn_to_page(pte_pfn(x)) 276 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 277 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 278 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 279 280 /* 281 * Initialize a new pgd / pud / pmd table with invalid pointers. 282 */ 283 extern void pgd_init(void *addr); 284 extern void pud_init(void *addr); 285 #define pud_init pud_init 286 extern void pmd_init(void *addr); 287 #define pmd_init pmd_init 288 extern void kernel_pte_init(void *addr); 289 #define kernel_pte_init kernel_pte_init 290 291 /* 292 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 293 * are !pte_none() && !pte_present(). 294 * 295 * Format of 32bit swap PTEs: 296 * 297 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 298 * 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 0 299 * <------------ offset -------------> E <- type -> <-- zeroes --> 300 * 301 * E is the exclusive marker that is not stored in swap entries. 302 * The zero'ed bits include _PAGE_PRESENT. 303 * 304 * Format of 64bit swap PTEs: 305 * 306 * 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 3 307 * 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 2 308 * <--------------------------- offset --------------------------- 309 * 310 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 311 * 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 0 312 * --------------> E <--- type ---> <---------- zeroes ----------> 313 * 314 * E is the exclusive marker that is not stored in swap entries. 315 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 316 */ 317 318 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7) 319 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) 320 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16) 321 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) 322 323 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 324 { 325 pte_t pte; 326 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT); 327 return pte; 328 } 329 330 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 331 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 332 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 333 334 #define __swp_entry_to_pte(x) __pte((x).val) 335 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE) 336 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 337 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 338 339 static inline bool pte_swp_exclusive(pte_t pte) 340 { 341 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 342 } 343 344 static inline pte_t pte_swp_mkexclusive(pte_t pte) 345 { 346 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 347 return pte; 348 } 349 350 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 351 { 352 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 353 return pte; 354 } 355 356 extern void paging_init(void); 357 358 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 359 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 360 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 361 362 static inline void set_pte(pte_t *ptep, pte_t pteval) 363 { 364 WRITE_ONCE(*ptep, pteval); 365 366 #ifdef CONFIG_SMP 367 if (pte_val(pteval) & _PAGE_GLOBAL) 368 DBAR(0b11000); /* o_wrw = 0b11000 */ 369 #endif 370 } 371 372 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 373 { 374 pte_t pte = ptep_get(ptep); 375 pte_val(pte) &= _PAGE_GLOBAL; 376 set_pte(ptep, pte); 377 } 378 379 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 380 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 381 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 382 383 extern pgd_t swapper_pg_dir[]; 384 extern pgd_t invalid_pg_dir[]; 385 386 /* 387 * The following only work if pte_present() is true. 388 * Undefined behaviour if not.. 389 */ 390 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 391 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 392 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 393 394 static inline pte_t pte_mkold(pte_t pte) 395 { 396 pte_val(pte) &= ~_PAGE_ACCESSED; 397 return pte; 398 } 399 400 static inline pte_t pte_mkyoung(pte_t pte) 401 { 402 pte_val(pte) |= _PAGE_ACCESSED; 403 return pte; 404 } 405 406 static inline pte_t pte_mkclean(pte_t pte) 407 { 408 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 409 return pte; 410 } 411 412 static inline pte_t pte_mkdirty(pte_t pte) 413 { 414 pte_val(pte) |= _PAGE_MODIFIED; 415 if (pte_val(pte) & _PAGE_WRITE) 416 pte_val(pte) |= _PAGE_DIRTY; 417 return pte; 418 } 419 420 static inline pte_t pte_mkwrite_novma(pte_t pte) 421 { 422 pte_val(pte) |= _PAGE_WRITE; 423 if (pte_val(pte) & _PAGE_MODIFIED) 424 pte_val(pte) |= _PAGE_DIRTY; 425 return pte; 426 } 427 428 static inline pte_t pte_wrprotect(pte_t pte) 429 { 430 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 431 return pte; 432 } 433 434 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 435 436 static inline pte_t pte_mkhuge(pte_t pte) 437 { 438 pte_val(pte) |= _PAGE_HUGE; 439 return pte; 440 } 441 442 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 443 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 444 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 445 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 446 447 #define pte_accessible pte_accessible 448 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 449 { 450 if (pte_val(a) & _PAGE_PRESENT) 451 return true; 452 453 if ((pte_val(a) & _PAGE_PROTNONE) && 454 atomic_read(&mm->tlb_flush_pending)) 455 return true; 456 457 return false; 458 } 459 460 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 461 { 462 if (pte_val(pte) & _PAGE_DIRTY) 463 pte_val(pte) |= _PAGE_MODIFIED; 464 465 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 466 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 467 } 468 469 extern void __update_tlb(struct vm_area_struct *vma, 470 unsigned long address, pte_t *ptep); 471 472 static inline void update_mmu_cache_range(struct vm_fault *vmf, 473 struct vm_area_struct *vma, unsigned long address, 474 pte_t *ptep, unsigned int nr) 475 { 476 for (;;) { 477 __update_tlb(vma, address, ptep); 478 if (--nr == 0) 479 break; 480 address += PAGE_SIZE; 481 ptep++; 482 } 483 } 484 #define update_mmu_cache(vma, addr, ptep) \ 485 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 486 487 #define update_mmu_tlb_range(vma, addr, ptep, nr) \ 488 update_mmu_cache_range(NULL, vma, addr, ptep, nr) 489 490 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 491 unsigned long address, pmd_t *pmdp) 492 { 493 __update_tlb(vma, address, (pte_t *)pmdp); 494 } 495 496 static inline unsigned long pmd_pfn(pmd_t pmd) 497 { 498 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 499 } 500 501 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 502 503 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 504 #define pmdp_establish generic_pmdp_establish 505 506 static inline int pmd_trans_huge(pmd_t pmd) 507 { 508 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 509 } 510 511 static inline pmd_t pmd_mkhuge(pmd_t pmd) 512 { 513 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 514 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 515 pmd_val(pmd) |= _PAGE_HUGE; 516 517 return pmd; 518 } 519 520 #define pmd_write pmd_write 521 static inline int pmd_write(pmd_t pmd) 522 { 523 return !!(pmd_val(pmd) & _PAGE_WRITE); 524 } 525 526 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 527 { 528 pmd_val(pmd) |= _PAGE_WRITE; 529 if (pmd_val(pmd) & _PAGE_MODIFIED) 530 pmd_val(pmd) |= _PAGE_DIRTY; 531 return pmd; 532 } 533 534 static inline pmd_t pmd_wrprotect(pmd_t pmd) 535 { 536 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 537 return pmd; 538 } 539 540 #define pmd_dirty pmd_dirty 541 static inline int pmd_dirty(pmd_t pmd) 542 { 543 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 544 } 545 546 static inline pmd_t pmd_mkclean(pmd_t pmd) 547 { 548 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 549 return pmd; 550 } 551 552 static inline pmd_t pmd_mkdirty(pmd_t pmd) 553 { 554 pmd_val(pmd) |= _PAGE_MODIFIED; 555 if (pmd_val(pmd) & _PAGE_WRITE) 556 pmd_val(pmd) |= _PAGE_DIRTY; 557 return pmd; 558 } 559 560 #define pmd_young pmd_young 561 static inline int pmd_young(pmd_t pmd) 562 { 563 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 564 } 565 566 static inline pmd_t pmd_mkold(pmd_t pmd) 567 { 568 pmd_val(pmd) &= ~_PAGE_ACCESSED; 569 return pmd; 570 } 571 572 static inline pmd_t pmd_mkyoung(pmd_t pmd) 573 { 574 pmd_val(pmd) |= _PAGE_ACCESSED; 575 return pmd; 576 } 577 578 static inline struct page *pmd_page(pmd_t pmd) 579 { 580 if (pmd_trans_huge(pmd)) 581 return pfn_to_page(pmd_pfn(pmd)); 582 583 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 584 } 585 586 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 587 { 588 if (pmd_val(pmd) & _PAGE_DIRTY) 589 pmd_val(pmd) |= _PAGE_MODIFIED; 590 591 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) | 592 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK)); 593 } 594 595 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 596 { 597 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 598 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 599 600 return pmd; 601 } 602 603 /* 604 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 605 * different prototype. 606 */ 607 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 608 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 609 unsigned long address, pmd_t *pmdp) 610 { 611 pmd_t old = pmdp_get(pmdp); 612 613 pmd_clear(pmdp); 614 615 return old; 616 } 617 618 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 619 620 #ifdef CONFIG_NUMA_BALANCING 621 static inline long pte_protnone(pte_t pte) 622 { 623 return (pte_val(pte) & _PAGE_PROTNONE); 624 } 625 626 static inline long pmd_protnone(pmd_t pmd) 627 { 628 return (pmd_val(pmd) & _PAGE_PROTNONE); 629 } 630 #endif /* CONFIG_NUMA_BALANCING */ 631 632 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 633 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 634 635 /* 636 * We provide our own get_unmapped area to cope with the virtual aliasing 637 * constraints placed on us by the cache architecture. 638 */ 639 #define HAVE_ARCH_UNMAPPED_AREA 640 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 641 642 #endif /* !__ASSEMBLER__ */ 643 644 #endif /* _ASM_PGTABLE_H */ 645