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_2G) /* 256MB for text, rest for data */ 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 /* Needed to limit get_free_mem_region() */ 129 #ifndef CONFIG_SPARSEMEM 130 #define DIRECT_MAP_PHYSMEM_END ((1ULL << (cpu_pabits + 1)) - 1) 131 #else 132 #define DIRECT_MAP_PHYSMEM_END min((1ULL << (cpu_pabits + 1)) - 1, (1ULL << MAX_PHYSMEM_BITS) - 1) 133 #endif 134 135 #define ptep_get(ptep) READ_ONCE(*(ptep)) 136 #define pmdp_get(pmdp) READ_ONCE(*(pmdp)) 137 138 #define pte_ERROR(e) \ 139 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 140 #ifndef __PAGETABLE_PMD_FOLDED 141 #define pmd_ERROR(e) \ 142 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 143 #endif 144 #ifndef __PAGETABLE_PUD_FOLDED 145 #define pud_ERROR(e) \ 146 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 147 #endif 148 #define pgd_ERROR(e) \ 149 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 150 151 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 152 153 #ifndef __PAGETABLE_PUD_FOLDED 154 155 typedef struct { unsigned long pud; } pud_t; 156 #define pud_val(x) ((x).pud) 157 #define __pud(x) ((pud_t) { (x) }) 158 159 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 160 161 /* 162 * Empty pgd/p4d entries point to the invalid_pud_table. 163 */ 164 static inline int p4d_none(p4d_t p4d) 165 { 166 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 167 } 168 169 static inline int p4d_bad(p4d_t p4d) 170 { 171 return p4d_val(p4d) & ~PAGE_MASK; 172 } 173 174 static inline int p4d_present(p4d_t p4d) 175 { 176 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 177 } 178 179 static inline pud_t *p4d_pgtable(p4d_t p4d) 180 { 181 return (pud_t *)p4d_val(p4d); 182 } 183 184 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 185 { 186 WRITE_ONCE(*p4d, p4dval); 187 } 188 189 static inline void p4d_clear(p4d_t *p4dp) 190 { 191 set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table)); 192 } 193 194 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 195 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 196 197 #endif 198 199 #ifndef __PAGETABLE_PMD_FOLDED 200 201 typedef struct { unsigned long pmd; } pmd_t; 202 #define pmd_val(x) ((x).pmd) 203 #define __pmd(x) ((pmd_t) { (x) }) 204 205 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 206 207 /* 208 * Empty pud entries point to the invalid_pmd_table. 209 */ 210 static inline int pud_none(pud_t pud) 211 { 212 return pud_val(pud) == (unsigned long)invalid_pmd_table; 213 } 214 215 static inline int pud_bad(pud_t pud) 216 { 217 return pud_val(pud) & ~PAGE_MASK; 218 } 219 220 static inline int pud_present(pud_t pud) 221 { 222 return pud_val(pud) != (unsigned long)invalid_pmd_table; 223 } 224 225 static inline pmd_t *pud_pgtable(pud_t pud) 226 { 227 return (pmd_t *)pud_val(pud); 228 } 229 230 static inline void set_pud(pud_t *pud, pud_t pudval) 231 { 232 WRITE_ONCE(*pud, pudval); 233 } 234 235 static inline void pud_clear(pud_t *pudp) 236 { 237 set_pud(pudp, __pud((unsigned long)invalid_pmd_table)); 238 } 239 240 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 241 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 242 243 #endif 244 245 /* 246 * Empty pmd entries point to the invalid_pte_table. 247 */ 248 static inline int pmd_none(pmd_t pmd) 249 { 250 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 251 } 252 253 static inline int pmd_bad(pmd_t pmd) 254 { 255 return (pmd_val(pmd) & ~PAGE_MASK); 256 } 257 258 static inline int pmd_present(pmd_t pmd) 259 { 260 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 261 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 262 263 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 264 } 265 266 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval) 267 { 268 WRITE_ONCE(*pmd, pmdval); 269 } 270 271 static inline void pmd_clear(pmd_t *pmdp) 272 { 273 set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table)); 274 } 275 276 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 277 278 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 279 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 280 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 281 282 #define pmd_page_vaddr(pmd) pmd_val(pmd) 283 284 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 285 286 #define pte_page(x) pfn_to_page(pte_pfn(x)) 287 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 288 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 289 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 290 291 /* 292 * Initialize a new pgd / pud / pmd table with invalid pointers. 293 */ 294 extern void pgd_init(void *addr); 295 extern void pud_init(void *addr); 296 #define pud_init pud_init 297 extern void pmd_init(void *addr); 298 #define pmd_init pmd_init 299 extern void kernel_pte_init(void *addr); 300 #define kernel_pte_init kernel_pte_init 301 302 /* 303 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 304 * are !pte_none() && !pte_present(). 305 * 306 * Format of 32bit swap PTEs: 307 * 308 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 309 * 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 0 310 * <------------ offset -------------> E <- type -> <-- zeroes --> 311 * 312 * E is the exclusive marker that is not stored in swap entries. 313 * The zero'ed bits include _PAGE_PRESENT. 314 * 315 * Format of 64bit swap PTEs: 316 * 317 * 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 3 318 * 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 2 319 * <--------------------------- offset --------------------------- 320 * 321 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 322 * 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 0 323 * --------------> E <--- type ---> <---------- zeroes ----------> 324 * 325 * E is the exclusive marker that is not stored in swap entries. 326 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 327 */ 328 329 #define __SWP_TYPE_BITS (IS_ENABLED(CONFIG_32BIT) ? 5 : 7) 330 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) 331 #define __SWP_TYPE_SHIFT (IS_ENABLED(CONFIG_32BIT) ? 8 : 16) 332 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) 333 334 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 335 { 336 pte_t pte; 337 pte_val(pte) = ((type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | (offset << __SWP_OFFSET_SHIFT); 338 return pte; 339 } 340 341 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 342 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 343 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 344 345 #define __swp_entry_to_pte(x) __pte((x).val) 346 #define __swp_entry_to_pmd(x) __pmd((x).val | _PAGE_HUGE) 347 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 348 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 349 350 static inline bool pte_swp_exclusive(pte_t pte) 351 { 352 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 353 } 354 355 static inline pte_t pte_swp_mkexclusive(pte_t pte) 356 { 357 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 358 return pte; 359 } 360 361 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 362 { 363 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 364 return pte; 365 } 366 367 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 368 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 369 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 370 371 static inline void set_pte(pte_t *ptep, pte_t pteval) 372 { 373 WRITE_ONCE(*ptep, pteval); 374 375 #ifdef CONFIG_SMP 376 if (pte_val(pteval) & _PAGE_GLOBAL) 377 DBAR(0b11000); /* o_wrw = 0b11000 */ 378 #endif 379 } 380 381 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 382 { 383 pte_t pte = ptep_get(ptep); 384 pte_val(pte) &= _PAGE_GLOBAL; 385 set_pte(ptep, pte); 386 } 387 388 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 389 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 390 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 391 392 extern pgd_t swapper_pg_dir[]; 393 extern pgd_t invalid_pg_dir[]; 394 395 /* 396 * The following only work if pte_present() is true. 397 * Undefined behaviour if not.. 398 */ 399 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 400 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 401 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 402 403 static inline pte_t pte_mkold(pte_t pte) 404 { 405 pte_val(pte) &= ~_PAGE_ACCESSED; 406 return pte; 407 } 408 409 static inline pte_t pte_mkyoung(pte_t pte) 410 { 411 pte_val(pte) |= _PAGE_ACCESSED; 412 return pte; 413 } 414 415 static inline pte_t pte_mkclean(pte_t pte) 416 { 417 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 418 return pte; 419 } 420 421 static inline pte_t pte_mkdirty(pte_t pte) 422 { 423 pte_val(pte) |= _PAGE_MODIFIED; 424 if (pte_val(pte) & _PAGE_WRITE) 425 pte_val(pte) |= _PAGE_DIRTY; 426 return pte; 427 } 428 429 static inline pte_t pte_mkwrite_novma(pte_t pte) 430 { 431 pte_val(pte) |= _PAGE_WRITE; 432 if (pte_val(pte) & _PAGE_MODIFIED) 433 pte_val(pte) |= _PAGE_DIRTY; 434 return pte; 435 } 436 437 static inline pte_t pte_wrprotect(pte_t pte) 438 { 439 if (pte_val(pte) & _PAGE_DIRTY) 440 pte_val(pte) |= _PAGE_MODIFIED; 441 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 442 return pte; 443 } 444 445 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 446 447 static inline pte_t pte_mkhuge(pte_t pte) 448 { 449 pte_val(pte) |= _PAGE_HUGE; 450 return pte; 451 } 452 453 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 454 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 455 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 456 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 457 458 #define pte_accessible pte_accessible 459 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 460 { 461 if (pte_val(a) & _PAGE_PRESENT) 462 return true; 463 464 if ((pte_val(a) & _PAGE_PROTNONE) && 465 atomic_read(&mm->tlb_flush_pending)) 466 return true; 467 468 return false; 469 } 470 471 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 472 { 473 if (pte_val(pte) & _PAGE_DIRTY) 474 pte_val(pte) |= _PAGE_MODIFIED; 475 476 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 477 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 478 } 479 480 extern void __update_tlb(struct vm_area_struct *vma, 481 unsigned long address, pte_t *ptep); 482 483 static inline void update_mmu_cache_range(struct vm_fault *vmf, 484 struct vm_area_struct *vma, unsigned long address, 485 pte_t *ptep, unsigned int nr) 486 { 487 for (;;) { 488 __update_tlb(vma, address, ptep); 489 if (--nr == 0) 490 break; 491 address += PAGE_SIZE; 492 ptep++; 493 } 494 } 495 #define update_mmu_cache(vma, addr, ptep) \ 496 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 497 498 #define update_mmu_tlb_range(vma, addr, ptep, nr) \ 499 update_mmu_cache_range(NULL, vma, addr, ptep, nr) 500 501 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 502 unsigned long address, pmd_t *pmdp) 503 { 504 __update_tlb(vma, address, (pte_t *)pmdp); 505 } 506 507 static inline unsigned long pmd_pfn(pmd_t pmd) 508 { 509 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 510 } 511 512 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 513 514 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 515 #define pmdp_establish generic_pmdp_establish 516 517 static inline int pmd_trans_huge(pmd_t pmd) 518 { 519 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 520 } 521 522 static inline pmd_t pmd_mkhuge(pmd_t pmd) 523 { 524 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 525 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 526 pmd_val(pmd) |= _PAGE_HUGE; 527 528 return pmd; 529 } 530 531 #define pmd_write pmd_write 532 static inline int pmd_write(pmd_t pmd) 533 { 534 return !!(pmd_val(pmd) & _PAGE_WRITE); 535 } 536 537 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 538 { 539 pmd_val(pmd) |= _PAGE_WRITE; 540 if (pmd_val(pmd) & _PAGE_MODIFIED) 541 pmd_val(pmd) |= _PAGE_DIRTY; 542 return pmd; 543 } 544 545 static inline pmd_t pmd_wrprotect(pmd_t pmd) 546 { 547 if (pmd_val(pmd) & _PAGE_DIRTY) 548 pmd_val(pmd) |= _PAGE_MODIFIED; 549 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 550 return pmd; 551 } 552 553 #define pmd_dirty pmd_dirty 554 static inline int pmd_dirty(pmd_t pmd) 555 { 556 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 557 } 558 559 static inline pmd_t pmd_mkclean(pmd_t pmd) 560 { 561 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 562 return pmd; 563 } 564 565 static inline pmd_t pmd_mkdirty(pmd_t pmd) 566 { 567 pmd_val(pmd) |= _PAGE_MODIFIED; 568 if (pmd_val(pmd) & _PAGE_WRITE) 569 pmd_val(pmd) |= _PAGE_DIRTY; 570 return pmd; 571 } 572 573 #define pmd_young pmd_young 574 static inline int pmd_young(pmd_t pmd) 575 { 576 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 577 } 578 579 static inline pmd_t pmd_mkold(pmd_t pmd) 580 { 581 pmd_val(pmd) &= ~_PAGE_ACCESSED; 582 return pmd; 583 } 584 585 static inline pmd_t pmd_mkyoung(pmd_t pmd) 586 { 587 pmd_val(pmd) |= _PAGE_ACCESSED; 588 return pmd; 589 } 590 591 static inline struct page *pmd_page(pmd_t pmd) 592 { 593 if (pmd_trans_huge(pmd)) 594 return pfn_to_page(pmd_pfn(pmd)); 595 596 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 597 } 598 599 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 600 { 601 if (pmd_val(pmd) & _PAGE_DIRTY) 602 pmd_val(pmd) |= _PAGE_MODIFIED; 603 604 return __pmd((pmd_val(pmd) & _HPAGE_CHG_MASK) | 605 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK)); 606 } 607 608 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 609 { 610 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 611 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 612 613 return pmd; 614 } 615 616 /* 617 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 618 * different prototype. 619 */ 620 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 621 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 622 unsigned long address, pmd_t *pmdp) 623 { 624 pmd_t old = pmdp_get(pmdp); 625 626 pmd_clear(pmdp); 627 628 return old; 629 } 630 631 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 632 633 #ifdef CONFIG_ARCH_HAS_PTE_PROTNONE 634 static inline long pte_protnone(pte_t pte) 635 { 636 return (pte_val(pte) & _PAGE_PROTNONE); 637 } 638 639 static inline long pmd_protnone(pmd_t pmd) 640 { 641 return (pmd_val(pmd) & _PAGE_PROTNONE); 642 } 643 #endif /* CONFIG_ARCH_HAS_PTE_PROTNONE */ 644 645 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 646 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 647 648 /* 649 * We provide our own get_unmapped area to cope with the virtual aliasing 650 * constraints placed on us by the cache architecture. 651 */ 652 #define HAVE_ARCH_UNMAPPED_AREA 653 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 654 655 #endif /* !__ASSEMBLER__ */ 656 657 #endif /* _ASM_PGTABLE_H */ 658