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 <linux/vmemmap-optimization.h> 76 #include <asm/fixmap.h> 77 #include <asm/sparsemem.h> 78 79 struct mm_struct; 80 struct vm_area_struct; 81 82 #ifdef CONFIG_32BIT 83 84 #define VMALLOC_START (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 85 86 #ifdef CONFIG_HIGHMEM 87 #define VMALLOC_END (PKMAP_BASE - (2 * PAGE_SIZE)) 88 #else 89 #define VMALLOC_END (FIXADDR_START - (2 * PAGE_SIZE)) 90 #endif 91 92 #define PKMAP_BASE (PKMAP_END - (PAGE_SIZE * LAST_PKMAP)) 93 #define PKMAP_END ((FIXADDR_START) & ~((LAST_PKMAP << PAGE_SHIFT)-1)) 94 95 #endif 96 97 #ifdef CONFIG_64BIT 98 99 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 100 #define MODULES_END (MODULES_VADDR + SZ_2G) /* 256MB for text, rest for data */ 101 102 #ifdef CONFIG_KFENCE 103 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) 104 #else 105 #define KFENCE_AREA_SIZE 0 106 #endif 107 108 #define VMALLOC_START MODULES_END 109 110 #ifndef CONFIG_KASAN 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)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE) 114 #else 115 #define VMALLOC_END \ 116 (vm_map_base + \ 117 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) 118 #endif 119 120 #define VMEMMAP_ALIGN max(PMD_SIZE, MAX_FOLIO_VMEMMAP_ALIGN) 121 #define vmemmap ((struct page *)(ALIGN(VMALLOC_END, VMEMMAP_ALIGN))) 122 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) 123 124 #define KFENCE_AREA_START (VMEMMAP_END + 1) 125 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) 126 127 #endif 128 129 /* Needed to limit get_free_mem_region() */ 130 #ifndef CONFIG_SPARSEMEM 131 #define DIRECT_MAP_PHYSMEM_END ((1ULL << (cpu_pabits + 1)) - 1) 132 #else 133 #define DIRECT_MAP_PHYSMEM_END min((1ULL << (cpu_pabits + 1)) - 1, (1ULL << MAX_PHYSMEM_BITS) - 1) 134 #endif 135 136 #define ptep_get(ptep) READ_ONCE(*(ptep)) 137 #define pmdp_get(pmdp) READ_ONCE(*(pmdp)) 138 139 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 140 141 #ifndef __PAGETABLE_PUD_FOLDED 142 143 typedef struct { unsigned long pud; } pud_t; 144 #define pud_val(x) ((x).pud) 145 #define __pud(x) ((pud_t) { (x) }) 146 147 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 148 149 /* 150 * Empty pgd/p4d entries point to the invalid_pud_table. 151 */ 152 static inline int p4d_none(p4d_t p4d) 153 { 154 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 155 } 156 157 static inline int p4d_bad(p4d_t p4d) 158 { 159 return p4d_val(p4d) & ~PAGE_MASK; 160 } 161 162 static inline int p4d_present(p4d_t p4d) 163 { 164 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 165 } 166 167 static inline pud_t *p4d_pgtable(p4d_t p4d) 168 { 169 return (pud_t *)p4d_val(p4d); 170 } 171 172 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 173 { 174 WRITE_ONCE(*p4d, p4dval); 175 } 176 177 static inline void p4d_clear(p4d_t *p4dp) 178 { 179 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table)); 180 } 181 182 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 183 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 184 185 #endif 186 187 #ifndef __PAGETABLE_PMD_FOLDED 188 189 typedef struct { unsigned long pmd; } pmd_t; 190 #define pmd_val(x) ((x).pmd) 191 #define __pmd(x) ((pmd_t) { (x) }) 192 193 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 194 195 /* 196 * Empty pud entries point to the invalid_pmd_table. 197 */ 198 static inline int pud_none(pud_t pud) 199 { 200 return pud_val(pud) == (unsigned long)invalid_pmd_table; 201 } 202 203 static inline int pud_bad(pud_t pud) 204 { 205 return pud_val(pud) & ~PAGE_MASK; 206 } 207 208 static inline int pud_present(pud_t pud) 209 { 210 return pud_val(pud) != (unsigned long)invalid_pmd_table; 211 } 212 213 static inline pmd_t *pud_pgtable(pud_t pud) 214 { 215 return (pmd_t *)pud_val(pud); 216 } 217 218 static inline void set_pud(pud_t *pud, pud_t pudval) 219 { 220 WRITE_ONCE(*pud, pudval); 221 } 222 223 static inline void pud_clear(pud_t *pudp) 224 { 225 set_pud(pudp, __pud((unsigned long)invalid_pmd_table)); 226 } 227 228 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 229 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 230 231 #endif 232 233 /* 234 * Empty pmd entries point to the invalid_pte_table. 235 */ 236 static inline int pmd_none(pmd_t pmd) 237 { 238 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 239 } 240 241 static inline int pmd_bad(pmd_t pmd) 242 { 243 return (pmd_val(pmd) & ~PAGE_MASK); 244 } 245 246 static inline int pmd_present(pmd_t pmd) 247 { 248 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 249 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 250 251 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 252 } 253 254 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval) 255 { 256 WRITE_ONCE(*pmd, pmdval); 257 } 258 259 static inline void pmd_clear(pmd_t *pmdp) 260 { 261 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table)); 262 } 263 264 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 265 266 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 267 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 268 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 269 270 #define pmd_page_vaddr(pmd) pmd_val(pmd) 271 272 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 273 274 #define pte_page(x) pfn_to_page(pte_pfn(x)) 275 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 276 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 277 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 278 279 /* 280 * Initialize a new pgd / pud / pmd table with invalid pointers. 281 */ 282 extern void pgd_init(void *addr); 283 extern void pud_init(void *addr); 284 #define pud_init pud_init 285 extern void pmd_init(void *addr); 286 #define pmd_init pmd_init 287 extern void kernel_pte_init(void *addr); 288 #define kernel_pte_init kernel_pte_init 289 290 /* 291 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 292 * are !pte_none() && !pte_present(). 293 * 294 * Format of 32bit swap PTEs: 295 * 296 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 297 * 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 0 298 * <------------ offset -------------> E <- type -> <-- zeroes --> 299 * 300 * E is the exclusive marker that is not stored in swap entries. 301 * The zero'ed bits include _PAGE_PRESENT. 302 * 303 * Format of 64bit swap PTEs: 304 * 305 * 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 3 306 * 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 2 307 * <--------------------------- offset --------------------------- 308 * 309 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 310 * 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 0 311 * --------------> E <--- type ---> <---------- zeroes ----------> 312 * 313 * E is the exclusive marker that is not stored in swap entries. 314 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 315 */ 316 317 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7) 318 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) 319 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16) 320 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) 321 322 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 323 { 324 pte_t pte; 325 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT); 326 return pte; 327 } 328 329 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 330 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 331 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 332 333 #define __swp_entry_to_pte(x) __pte((x).val) 334 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE) 335 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 336 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 337 338 static inline bool pte_swp_exclusive(pte_t pte) 339 { 340 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 341 } 342 343 static inline pte_t pte_swp_mkexclusive(pte_t pte) 344 { 345 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 346 return pte; 347 } 348 349 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 350 { 351 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 352 return pte; 353 } 354 355 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 356 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 357 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 358 359 static inline void set_pte(pte_t *ptep, pte_t pteval) 360 { 361 WRITE_ONCE(*ptep, pteval); 362 363 #ifdef CONFIG_SMP 364 if (pte_val(pteval) & _PAGE_GLOBAL) 365 DBAR(0b11000); /* o_wrw = 0b11000 */ 366 #endif 367 } 368 369 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 370 { 371 pte_t pte = ptep_get(ptep); 372 pte_val(pte) &= _PAGE_GLOBAL; 373 set_pte(ptep, pte); 374 } 375 376 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 377 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 378 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 379 380 extern pgd_t swapper_pg_dir[]; 381 extern pgd_t invalid_pg_dir[]; 382 383 /* 384 * The following only work if pte_present() is true. 385 * Undefined behaviour if not.. 386 */ 387 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 388 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 389 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 390 391 static inline pte_t pte_mkold(pte_t pte) 392 { 393 pte_val(pte) &= ~_PAGE_ACCESSED; 394 return pte; 395 } 396 397 static inline pte_t pte_mkyoung(pte_t pte) 398 { 399 pte_val(pte) |= _PAGE_ACCESSED; 400 return pte; 401 } 402 403 static inline pte_t pte_mkclean(pte_t pte) 404 { 405 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 406 return pte; 407 } 408 409 static inline pte_t pte_mkdirty(pte_t pte) 410 { 411 pte_val(pte) |= _PAGE_MODIFIED; 412 if (pte_val(pte) & _PAGE_WRITE) 413 pte_val(pte) |= _PAGE_DIRTY; 414 return pte; 415 } 416 417 static inline pte_t pte_mkwrite_novma(pte_t pte) 418 { 419 pte_val(pte) |= _PAGE_WRITE; 420 if (pte_val(pte) & _PAGE_MODIFIED) 421 pte_val(pte) |= _PAGE_DIRTY; 422 return pte; 423 } 424 425 static inline pte_t pte_wrprotect(pte_t pte) 426 { 427 if (pte_val(pte) & _PAGE_DIRTY) 428 pte_val(pte) |= _PAGE_MODIFIED; 429 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 430 return pte; 431 } 432 433 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 434 435 static inline pte_t pte_mkhuge(pte_t pte) 436 { 437 pte_val(pte) |= _PAGE_HUGE; 438 return pte; 439 } 440 441 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 442 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 443 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 444 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 445 446 #define pte_accessible pte_accessible 447 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 448 { 449 if (pte_val(a) & _PAGE_PRESENT) 450 return true; 451 452 if ((pte_val(a) & _PAGE_PROTNONE) && 453 atomic_read(&mm->tlb_flush_pending)) 454 return true; 455 456 return false; 457 } 458 459 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 460 { 461 if (pte_val(pte) & _PAGE_DIRTY) 462 pte_val(pte) |= _PAGE_MODIFIED; 463 464 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 465 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 466 } 467 468 extern void __update_tlb(struct vm_area_struct *vma, 469 unsigned long address, pte_t *ptep); 470 471 static inline void update_mmu_cache_range(struct vm_fault *vmf, 472 struct vm_area_struct *vma, unsigned long address, 473 pte_t *ptep, unsigned int nr) 474 { 475 for (;;) { 476 __update_tlb(vma, address, ptep); 477 if (--nr == 0) 478 break; 479 address += PAGE_SIZE; 480 ptep++; 481 } 482 } 483 #define update_mmu_cache(vma, addr, ptep) \ 484 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 485 486 #define update_mmu_tlb_range(vma, addr, ptep, nr) \ 487 update_mmu_cache_range(NULL, vma, addr, ptep, nr) 488 489 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 490 unsigned long address, pmd_t *pmdp) 491 { 492 __update_tlb(vma, address, (pte_t *)pmdp); 493 } 494 495 static inline unsigned long pmd_pfn(pmd_t pmd) 496 { 497 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 498 } 499 500 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 501 502 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 503 #define pmdp_establish generic_pmdp_establish 504 505 static inline int pmd_trans_huge(pmd_t pmd) 506 { 507 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 508 } 509 510 static inline pmd_t pmd_mkhuge(pmd_t pmd) 511 { 512 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 513 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 514 pmd_val(pmd) |= _PAGE_HUGE; 515 516 return pmd; 517 } 518 519 #define pmd_write pmd_write 520 static inline int pmd_write(pmd_t pmd) 521 { 522 return !!(pmd_val(pmd) & _PAGE_WRITE); 523 } 524 525 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 526 { 527 pmd_val(pmd) |= _PAGE_WRITE; 528 if (pmd_val(pmd) & _PAGE_MODIFIED) 529 pmd_val(pmd) |= _PAGE_DIRTY; 530 return pmd; 531 } 532 533 static inline pmd_t pmd_wrprotect(pmd_t pmd) 534 { 535 if (pmd_val(pmd) & _PAGE_DIRTY) 536 pmd_val(pmd) |= _PAGE_MODIFIED; 537 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 538 return pmd; 539 } 540 541 #define pmd_dirty pmd_dirty 542 static inline int pmd_dirty(pmd_t pmd) 543 { 544 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 545 } 546 547 static inline pmd_t pmd_mkclean(pmd_t pmd) 548 { 549 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 550 return pmd; 551 } 552 553 static inline pmd_t pmd_mkdirty(pmd_t pmd) 554 { 555 pmd_val(pmd) |= _PAGE_MODIFIED; 556 if (pmd_val(pmd) & _PAGE_WRITE) 557 pmd_val(pmd) |= _PAGE_DIRTY; 558 return pmd; 559 } 560 561 #define pmd_young pmd_young 562 static inline int pmd_young(pmd_t pmd) 563 { 564 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 565 } 566 567 static inline pmd_t pmd_mkold(pmd_t pmd) 568 { 569 pmd_val(pmd) &= ~_PAGE_ACCESSED; 570 return pmd; 571 } 572 573 static inline pmd_t pmd_mkyoung(pmd_t pmd) 574 { 575 pmd_val(pmd) |= _PAGE_ACCESSED; 576 return pmd; 577 } 578 579 static inline struct page *pmd_page(pmd_t pmd) 580 { 581 if (pmd_trans_huge(pmd)) 582 return pfn_to_page(pmd_pfn(pmd)); 583 584 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 585 } 586 587 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 588 { 589 if (pmd_val(pmd) & _PAGE_DIRTY) 590 pmd_val(pmd) |= _PAGE_MODIFIED; 591 592 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) | 593 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK)); 594 } 595 596 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 597 { 598 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 599 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 600 601 return pmd; 602 } 603 604 /* 605 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 606 * different prototype. 607 */ 608 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 609 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 610 unsigned long address, pmd_t *pmdp) 611 { 612 pmd_t old = pmdp_get(pmdp); 613 614 pmd_clear(pmdp); 615 616 return old; 617 } 618 619 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 620 621 #ifdef CONFIG_ARCH_HAS_PTE_PROTNONE 622 static inline long pte_protnone(pte_t pte) 623 { 624 return (pte_val(pte) & _PAGE_PROTNONE); 625 } 626 627 static inline long pmd_protnone(pmd_t pmd) 628 { 629 return (pmd_val(pmd) & _PAGE_PROTNONE); 630 } 631 #endif /* CONFIG_ARCH_HAS_PTE_PROTNONE */ 632 633 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 634 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 635 636 /* 637 * We provide our own get_unmapped area to cope with the virtual aliasing 638 * constraints placed on us by the cache architecture. 639 */ 640 #define HAVE_ARCH_UNMAPPED_AREA 641 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 642 643 #endif /* !__ASSEMBLER__ */ 644 645 #endif /* _ASM_PGTABLE_H */ 646