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 #ifdef CONFIG_HIGHMEM 27 #include <asm/highmem.h> 28 #endif 29 30 #if CONFIG_PGTABLE_LEVELS == 2 31 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 32 #elif CONFIG_PGTABLE_LEVELS == 3 33 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 34 #define PMD_SIZE (1UL << PMD_SHIFT) 35 #define PMD_MASK (~(PMD_SIZE-1)) 36 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG)) 37 #elif CONFIG_PGTABLE_LEVELS == 4 38 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTRLOG)) 39 #define PMD_SIZE (1UL << PMD_SHIFT) 40 #define PMD_MASK (~(PMD_SIZE-1)) 41 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - PTRLOG)) 42 #define PUD_SIZE (1UL << PUD_SHIFT) 43 #define PUD_MASK (~(PUD_SIZE-1)) 44 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - PTRLOG)) 45 #endif 46 47 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 48 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 49 50 #ifdef CONFIG_32BIT 51 #define VA_BITS 32 52 #else 53 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - PTRLOG)) 54 #endif 55 56 #define PTRS_PER_PGD (PAGE_SIZE >> PTRLOG) 57 #if CONFIG_PGTABLE_LEVELS > 3 58 #define PTRS_PER_PUD (PAGE_SIZE >> PTRLOG) 59 #endif 60 #if CONFIG_PGTABLE_LEVELS > 2 61 #define PTRS_PER_PMD (PAGE_SIZE >> PTRLOG) 62 #endif 63 #define PTRS_PER_PTE (PAGE_SIZE >> PTRLOG) 64 65 #ifdef CONFIG_32BIT 66 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) 67 #else 68 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 69 #endif 70 71 #ifndef __ASSEMBLER__ 72 73 #include <linux/mm_types.h> 74 #include <linux/mmzone.h> 75 #include <asm/fixmap.h> 76 #include <asm/sparsemem.h> 77 78 struct mm_struct; 79 struct vm_area_struct; 80 81 #ifdef CONFIG_32BIT 82 83 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 84 85 #ifdef CONFIG_HIGHMEM 86 #define VMALLOC_END (PKMAP_BASE - (2 * PAGE_SIZE)) 87 #else 88 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE)) 89 #endif 90 91 #define PKMAP_BASE (PKMAP_END - (PAGE_SIZE * LAST_PKMAP)) 92 #define PKMAP_END ((FIXADDR_START) & ~((LAST_PKMAP << PAGE_SHIFT)-1)) 93 94 #endif 95 96 #ifdef CONFIG_64BIT 97 98 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 99 #define MODULES_END (MODULES_VADDR + SZ_256M) 100 101 #ifdef CONFIG_KFENCE 102 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) 103 #else 104 #define KFENCE_AREA_SIZE 0 105 #endif 106 107 #define VMALLOC_START MODULES_END 108 109 #ifndef CONFIG_KASAN 110 #define VMALLOC_END \ 111 (vm_map_base + \ 112 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) 113 #else 114 #define VMALLOC_END \ 115 (vm_map_base + \ 116 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) 117 #endif 118 119 #define VMEMMAP_ALIGN max(PMD_SIZE, MAX_FOLIO_VMEMMAP_ALIGN) 120 #define vmemmap ((struct page *)(ALIGN(VMALLOC_END, VMEMMAP_ALIGN))) 121 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) 122 123 #define KFENCE_AREA_START (VMEMMAP_END + 1) 124 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) 125 126 #endif 127 128 #define ptep_get(ptep) READ_ONCE(*(ptep)) 129 #define pmdp_get(pmdp) READ_ONCE(*(pmdp)) 130 131 #define pte_ERROR(e) \ 132 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 133 #ifndef __PAGETABLE_PMD_FOLDED 134 #define pmd_ERROR(e) \ 135 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 136 #endif 137 #ifndef __PAGETABLE_PUD_FOLDED 138 #define pud_ERROR(e) \ 139 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 140 #endif 141 #define pgd_ERROR(e) \ 142 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 143 144 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 145 146 #ifndef __PAGETABLE_PUD_FOLDED 147 148 typedef struct { unsigned long pud; } pud_t; 149 #define pud_val(x) ((x).pud) 150 #define __pud(x) ((pud_t) { (x) }) 151 152 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 153 154 /* 155 * Empty pgd/p4d entries point to the invalid_pud_table. 156 */ 157 static inline int p4d_none(p4d_t p4d) 158 { 159 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 160 } 161 162 static inline int p4d_bad(p4d_t p4d) 163 { 164 return p4d_val(p4d) & ~PAGE_MASK; 165 } 166 167 static inline int p4d_present(p4d_t p4d) 168 { 169 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 170 } 171 172 static inline pud_t *p4d_pgtable(p4d_t p4d) 173 { 174 return (pud_t *)p4d_val(p4d); 175 } 176 177 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 178 { 179 WRITE_ONCE(*p4d, p4dval); 180 } 181 182 static inline void p4d_clear(p4d_t *p4dp) 183 { 184 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table)); 185 } 186 187 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 188 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 189 190 #endif 191 192 #ifndef __PAGETABLE_PMD_FOLDED 193 194 typedef struct { unsigned long pmd; } pmd_t; 195 #define pmd_val(x) ((x).pmd) 196 #define __pmd(x) ((pmd_t) { (x) }) 197 198 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 199 200 /* 201 * Empty pud entries point to the invalid_pmd_table. 202 */ 203 static inline int pud_none(pud_t pud) 204 { 205 return pud_val(pud) == (unsigned long)invalid_pmd_table; 206 } 207 208 static inline int pud_bad(pud_t pud) 209 { 210 return pud_val(pud) & ~PAGE_MASK; 211 } 212 213 static inline int pud_present(pud_t pud) 214 { 215 return pud_val(pud) != (unsigned long)invalid_pmd_table; 216 } 217 218 static inline pmd_t *pud_pgtable(pud_t pud) 219 { 220 return (pmd_t *)pud_val(pud); 221 } 222 223 static inline void set_pud(pud_t *pud, pud_t pudval) 224 { 225 WRITE_ONCE(*pud, pudval); 226 } 227 228 static inline void pud_clear(pud_t *pudp) 229 { 230 set_pud(pudp, __pud((unsigned long)invalid_pmd_table)); 231 } 232 233 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 234 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 235 236 #endif 237 238 /* 239 * Empty pmd entries point to the invalid_pte_table. 240 */ 241 static inline int pmd_none(pmd_t pmd) 242 { 243 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 244 } 245 246 static inline int pmd_bad(pmd_t pmd) 247 { 248 return (pmd_val(pmd) & ~PAGE_MASK); 249 } 250 251 static inline int pmd_present(pmd_t pmd) 252 { 253 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 254 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 255 256 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 257 } 258 259 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval) 260 { 261 WRITE_ONCE(*pmd, pmdval); 262 } 263 264 static inline void pmd_clear(pmd_t *pmdp) 265 { 266 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table)); 267 } 268 269 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 270 271 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 272 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 273 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 274 275 #define pmd_page_vaddr(pmd) pmd_val(pmd) 276 277 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 278 279 #define pte_page(x) pfn_to_page(pte_pfn(x)) 280 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 281 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 282 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 283 284 /* 285 * Initialize a new pgd / pud / pmd table with invalid pointers. 286 */ 287 extern void pgd_init(void *addr); 288 extern void pud_init(void *addr); 289 #define pud_init pud_init 290 extern void pmd_init(void *addr); 291 #define pmd_init pmd_init 292 extern void kernel_pte_init(void *addr); 293 #define kernel_pte_init kernel_pte_init 294 295 /* 296 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 297 * are !pte_none() && !pte_present(). 298 * 299 * Format of 32bit swap PTEs: 300 * 301 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 302 * 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 0 303 * <------------ offset -------------> E <- type -> <-- zeroes --> 304 * 305 * E is the exclusive marker that is not stored in swap entries. 306 * The zero'ed bits include _PAGE_PRESENT. 307 * 308 * Format of 64bit swap PTEs: 309 * 310 * 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 3 311 * 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 2 312 * <--------------------------- offset --------------------------- 313 * 314 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 315 * 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 0 316 * --------------> E <--- type ---> <---------- zeroes ----------> 317 * 318 * E is the exclusive marker that is not stored in swap entries. 319 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 320 */ 321 322 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7) 323 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) 324 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16) 325 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) 326 327 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 328 { 329 pte_t pte; 330 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT); 331 return pte; 332 } 333 334 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 335 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 336 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 337 338 #define __swp_entry_to_pte(x) __pte((x).val) 339 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE) 340 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 341 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 342 343 static inline bool pte_swp_exclusive(pte_t pte) 344 { 345 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 346 } 347 348 static inline pte_t pte_swp_mkexclusive(pte_t pte) 349 { 350 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 351 return pte; 352 } 353 354 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 355 { 356 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 357 return pte; 358 } 359 360 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 361 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 362 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 363 364 static inline void set_pte(pte_t *ptep, pte_t pteval) 365 { 366 WRITE_ONCE(*ptep, pteval); 367 368 #ifdef CONFIG_SMP 369 if (pte_val(pteval) & _PAGE_GLOBAL) 370 DBAR(0b11000); /* o_wrw = 0b11000 */ 371 #endif 372 } 373 374 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 375 { 376 pte_t pte = ptep_get(ptep); 377 pte_val(pte) &= _PAGE_GLOBAL; 378 set_pte(ptep, pte); 379 } 380 381 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 382 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 383 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 384 385 extern pgd_t swapper_pg_dir[]; 386 extern pgd_t invalid_pg_dir[]; 387 388 /* 389 * The following only work if pte_present() is true. 390 * Undefined behaviour if not.. 391 */ 392 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 393 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 394 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 395 396 static inline pte_t pte_mkold(pte_t pte) 397 { 398 pte_val(pte) &= ~_PAGE_ACCESSED; 399 return pte; 400 } 401 402 static inline pte_t pte_mkyoung(pte_t pte) 403 { 404 pte_val(pte) |= _PAGE_ACCESSED; 405 return pte; 406 } 407 408 static inline pte_t pte_mkclean(pte_t pte) 409 { 410 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 411 return pte; 412 } 413 414 static inline pte_t pte_mkdirty(pte_t pte) 415 { 416 pte_val(pte) |= _PAGE_MODIFIED; 417 if (pte_val(pte) & _PAGE_WRITE) 418 pte_val(pte) |= _PAGE_DIRTY; 419 return pte; 420 } 421 422 static inline pte_t pte_mkwrite_novma(pte_t pte) 423 { 424 pte_val(pte) |= _PAGE_WRITE; 425 if (pte_val(pte) & _PAGE_MODIFIED) 426 pte_val(pte) |= _PAGE_DIRTY; 427 return pte; 428 } 429 430 static inline pte_t pte_wrprotect(pte_t pte) 431 { 432 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 433 return pte; 434 } 435 436 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 437 438 static inline pte_t pte_mkhuge(pte_t pte) 439 { 440 pte_val(pte) |= _PAGE_HUGE; 441 return pte; 442 } 443 444 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 445 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 446 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 447 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 448 449 #define pte_accessible pte_accessible 450 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 451 { 452 if (pte_val(a) & _PAGE_PRESENT) 453 return true; 454 455 if ((pte_val(a) & _PAGE_PROTNONE) && 456 atomic_read(&mm->tlb_flush_pending)) 457 return true; 458 459 return false; 460 } 461 462 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 463 { 464 if (pte_val(pte) & _PAGE_DIRTY) 465 pte_val(pte) |= _PAGE_MODIFIED; 466 467 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 468 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 469 } 470 471 extern void __update_tlb(struct vm_area_struct *vma, 472 unsigned long address, pte_t *ptep); 473 474 static inline void update_mmu_cache_range(struct vm_fault *vmf, 475 struct vm_area_struct *vma, unsigned long address, 476 pte_t *ptep, unsigned int nr) 477 { 478 for (;;) { 479 __update_tlb(vma, address, ptep); 480 if (--nr == 0) 481 break; 482 address += PAGE_SIZE; 483 ptep++; 484 } 485 } 486 #define update_mmu_cache(vma, addr, ptep) \ 487 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 488 489 #define update_mmu_tlb_range(vma, addr, ptep, nr) \ 490 update_mmu_cache_range(NULL, vma, addr, ptep, nr) 491 492 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 493 unsigned long address, pmd_t *pmdp) 494 { 495 __update_tlb(vma, address, (pte_t *)pmdp); 496 } 497 498 static inline unsigned long pmd_pfn(pmd_t pmd) 499 { 500 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 501 } 502 503 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 504 505 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 506 #define pmdp_establish generic_pmdp_establish 507 508 static inline int pmd_trans_huge(pmd_t pmd) 509 { 510 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 511 } 512 513 static inline pmd_t pmd_mkhuge(pmd_t pmd) 514 { 515 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 516 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 517 pmd_val(pmd) |= _PAGE_HUGE; 518 519 return pmd; 520 } 521 522 #define pmd_write pmd_write 523 static inline int pmd_write(pmd_t pmd) 524 { 525 return !!(pmd_val(pmd) & _PAGE_WRITE); 526 } 527 528 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 529 { 530 pmd_val(pmd) |= _PAGE_WRITE; 531 if (pmd_val(pmd) & _PAGE_MODIFIED) 532 pmd_val(pmd) |= _PAGE_DIRTY; 533 return pmd; 534 } 535 536 static inline pmd_t pmd_wrprotect(pmd_t pmd) 537 { 538 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 539 return pmd; 540 } 541 542 #define pmd_dirty pmd_dirty 543 static inline int pmd_dirty(pmd_t pmd) 544 { 545 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 546 } 547 548 static inline pmd_t pmd_mkclean(pmd_t pmd) 549 { 550 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 551 return pmd; 552 } 553 554 static inline pmd_t pmd_mkdirty(pmd_t pmd) 555 { 556 pmd_val(pmd) |= _PAGE_MODIFIED; 557 if (pmd_val(pmd) & _PAGE_WRITE) 558 pmd_val(pmd) |= _PAGE_DIRTY; 559 return pmd; 560 } 561 562 #define pmd_young pmd_young 563 static inline int pmd_young(pmd_t pmd) 564 { 565 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 566 } 567 568 static inline pmd_t pmd_mkold(pmd_t pmd) 569 { 570 pmd_val(pmd) &= ~_PAGE_ACCESSED; 571 return pmd; 572 } 573 574 static inline pmd_t pmd_mkyoung(pmd_t pmd) 575 { 576 pmd_val(pmd) |= _PAGE_ACCESSED; 577 return pmd; 578 } 579 580 static inline struct page *pmd_page(pmd_t pmd) 581 { 582 if (pmd_trans_huge(pmd)) 583 return pfn_to_page(pmd_pfn(pmd)); 584 585 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 586 } 587 588 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 589 { 590 if (pmd_val(pmd) & _PAGE_DIRTY) 591 pmd_val(pmd) |= _PAGE_MODIFIED; 592 593 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) | 594 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK)); 595 } 596 597 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 598 { 599 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 600 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 601 602 return pmd; 603 } 604 605 /* 606 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 607 * different prototype. 608 */ 609 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 610 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 611 unsigned long address, pmd_t *pmdp) 612 { 613 pmd_t old = pmdp_get(pmdp); 614 615 pmd_clear(pmdp); 616 617 return old; 618 } 619 620 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 621 622 #ifdef CONFIG_NUMA_BALANCING 623 static inline long pte_protnone(pte_t pte) 624 { 625 return (pte_val(pte) & _PAGE_PROTNONE); 626 } 627 628 static inline long pmd_protnone(pmd_t pmd) 629 { 630 return (pmd_val(pmd) & _PAGE_PROTNONE); 631 } 632 #endif /* CONFIG_NUMA_BALANCING */ 633 634 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 635 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 636 637 /* 638 * We provide our own get_unmapped area to cope with the virtual aliasing 639 * constraints placed on us by the cache architecture. 640 */ 641 #define HAVE_ARCH_UNMAPPED_AREA 642 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 643 644 #endif /* !__ASSEMBLER__ */ 645 646 #endif /* _ASM_PGTABLE_H */ 647