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