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/page.h> 15 #include <asm/pgtable-bits.h> 16 17 #if CONFIG_PGTABLE_LEVELS == 2 18 #include <asm-generic/pgtable-nopmd.h> 19 #elif CONFIG_PGTABLE_LEVELS == 3 20 #include <asm-generic/pgtable-nopud.h> 21 #else 22 #include <asm-generic/pgtable-nop4d.h> 23 #endif 24 25 #if CONFIG_PGTABLE_LEVELS == 2 26 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 27 #elif CONFIG_PGTABLE_LEVELS == 3 28 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 29 #define PMD_SIZE (1UL << PMD_SHIFT) 30 #define PMD_MASK (~(PMD_SIZE-1)) 31 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) 32 #elif CONFIG_PGTABLE_LEVELS == 4 33 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 34 #define PMD_SIZE (1UL << PMD_SHIFT) 35 #define PMD_MASK (~(PMD_SIZE-1)) 36 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) 37 #define PUD_SIZE (1UL << PUD_SHIFT) 38 #define PUD_MASK (~(PUD_SIZE-1)) 39 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - 3)) 40 #endif 41 42 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 43 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 44 45 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3)) 46 47 #define PTRS_PER_PGD (PAGE_SIZE >> 3) 48 #if CONFIG_PGTABLE_LEVELS > 3 49 #define PTRS_PER_PUD (PAGE_SIZE >> 3) 50 #endif 51 #if CONFIG_PGTABLE_LEVELS > 2 52 #define PTRS_PER_PMD (PAGE_SIZE >> 3) 53 #endif 54 #define PTRS_PER_PTE (PAGE_SIZE >> 3) 55 56 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 57 58 #ifndef __ASSEMBLY__ 59 60 #include <linux/mm_types.h> 61 #include <linux/mmzone.h> 62 #include <asm/fixmap.h> 63 #include <asm/sparsemem.h> 64 65 struct mm_struct; 66 struct vm_area_struct; 67 68 /* 69 * ZERO_PAGE is a global shared page that is always zero; used 70 * for zero-mapped memory areas etc.. 71 */ 72 73 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 74 75 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) 76 77 /* 78 * TLB refill handlers may also map the vmalloc area into xkvrange. 79 * Avoid the first couple of pages so NULL pointer dereferences will 80 * still reliably trap. 81 */ 82 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 83 #define MODULES_END (MODULES_VADDR + SZ_256M) 84 85 #ifdef CONFIG_KFENCE 86 #define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) 87 #else 88 #define KFENCE_AREA_SIZE 0 89 #endif 90 91 #define VMALLOC_START MODULES_END 92 93 #ifndef CONFIG_KASAN 94 #define VMALLOC_END \ 95 (vm_map_base + \ 96 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) 97 #else 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) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE) 101 #endif 102 103 #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK)) 104 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) 105 106 #define KFENCE_AREA_START (VMEMMAP_END + 1) 107 #define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) 108 109 #define pte_ERROR(e) \ 110 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 111 #ifndef __PAGETABLE_PMD_FOLDED 112 #define pmd_ERROR(e) \ 113 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 114 #endif 115 #ifndef __PAGETABLE_PUD_FOLDED 116 #define pud_ERROR(e) \ 117 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 118 #endif 119 #define pgd_ERROR(e) \ 120 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 121 122 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 123 124 #ifndef __PAGETABLE_PUD_FOLDED 125 126 typedef struct { unsigned long pud; } pud_t; 127 #define pud_val(x) ((x).pud) 128 #define __pud(x) ((pud_t) { (x) }) 129 130 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 131 132 /* 133 * Empty pgd/p4d entries point to the invalid_pud_table. 134 */ 135 static inline int p4d_none(p4d_t p4d) 136 { 137 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 138 } 139 140 static inline int p4d_bad(p4d_t p4d) 141 { 142 return p4d_val(p4d) & ~PAGE_MASK; 143 } 144 145 static inline int p4d_present(p4d_t p4d) 146 { 147 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 148 } 149 150 static inline void p4d_clear(p4d_t *p4dp) 151 { 152 p4d_val(*p4dp) = (unsigned long)invalid_pud_table; 153 } 154 155 static inline pud_t *p4d_pgtable(p4d_t p4d) 156 { 157 return (pud_t *)p4d_val(p4d); 158 } 159 160 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 161 { 162 *p4d = p4dval; 163 } 164 165 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) 166 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 167 168 #endif 169 170 #ifndef __PAGETABLE_PMD_FOLDED 171 172 typedef struct { unsigned long pmd; } pmd_t; 173 #define pmd_val(x) ((x).pmd) 174 #define __pmd(x) ((pmd_t) { (x) }) 175 176 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 177 178 /* 179 * Empty pud entries point to the invalid_pmd_table. 180 */ 181 static inline int pud_none(pud_t pud) 182 { 183 return pud_val(pud) == (unsigned long)invalid_pmd_table; 184 } 185 186 static inline int pud_bad(pud_t pud) 187 { 188 return pud_val(pud) & ~PAGE_MASK; 189 } 190 191 static inline int pud_present(pud_t pud) 192 { 193 return pud_val(pud) != (unsigned long)invalid_pmd_table; 194 } 195 196 static inline void pud_clear(pud_t *pudp) 197 { 198 pud_val(*pudp) = ((unsigned long)invalid_pmd_table); 199 } 200 201 static inline pmd_t *pud_pgtable(pud_t pud) 202 { 203 return (pmd_t *)pud_val(pud); 204 } 205 206 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0) 207 208 #define pud_phys(pud) PHYSADDR(pud_val(pud)) 209 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 210 211 #endif 212 213 /* 214 * Empty pmd entries point to the invalid_pte_table. 215 */ 216 static inline int pmd_none(pmd_t pmd) 217 { 218 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 219 } 220 221 static inline int pmd_bad(pmd_t pmd) 222 { 223 return (pmd_val(pmd) & ~PAGE_MASK); 224 } 225 226 static inline int pmd_present(pmd_t pmd) 227 { 228 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 229 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID)); 230 231 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 232 } 233 234 static inline void pmd_clear(pmd_t *pmdp) 235 { 236 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table); 237 } 238 239 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0) 240 241 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) 242 243 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 244 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 245 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 246 247 #define pmd_page_vaddr(pmd) pmd_val(pmd) 248 249 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 250 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 251 252 #define pte_page(x) pfn_to_page(pte_pfn(x)) 253 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT)) 254 #define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 255 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot)) 256 257 /* 258 * Initialize a new pgd / pud / pmd table with invalid pointers. 259 */ 260 extern void pgd_init(void *addr); 261 extern void pud_init(void *addr); 262 extern void pmd_init(void *addr); 263 264 /* 265 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 266 * are !pte_none() && !pte_present(). 267 * 268 * Format of swap PTEs: 269 * 270 * 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 3 271 * 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 2 272 * <--------------------------- offset --------------------------- 273 * 274 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 275 * 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 0 276 * --------------> E <--- type ---> <---------- zeroes ----------> 277 * 278 * E is the exclusive marker that is not stored in swap entries. 279 * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. 280 */ 281 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 282 { pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; } 283 284 #define __swp_type(x) (((x).val >> 16) & 0x7f) 285 #define __swp_offset(x) ((x).val >> 24) 286 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 287 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 288 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 289 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 290 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) 291 292 static inline int pte_swp_exclusive(pte_t pte) 293 { 294 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 295 } 296 297 static inline pte_t pte_swp_mkexclusive(pte_t pte) 298 { 299 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 300 return pte; 301 } 302 303 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 304 { 305 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 306 return pte; 307 } 308 309 extern void paging_init(void); 310 311 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 312 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 313 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 314 315 static inline void set_pte(pte_t *ptep, pte_t pteval) 316 { 317 *ptep = pteval; 318 if (pte_val(pteval) & _PAGE_GLOBAL) { 319 pte_t *buddy = ptep_buddy(ptep); 320 /* 321 * Make sure the buddy is global too (if it's !none, 322 * it better already be global) 323 */ 324 #ifdef CONFIG_SMP 325 /* 326 * For SMP, multiple CPUs can race, so we need to do 327 * this atomically. 328 */ 329 unsigned long page_global = _PAGE_GLOBAL; 330 unsigned long tmp; 331 332 __asm__ __volatile__ ( 333 "1:" __LL "%[tmp], %[buddy] \n" 334 " bnez %[tmp], 2f \n" 335 " or %[tmp], %[tmp], %[global] \n" 336 __SC "%[tmp], %[buddy] \n" 337 " beqz %[tmp], 1b \n" 338 " nop \n" 339 "2: \n" 340 __WEAK_LLSC_MB 341 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) 342 : [global] "r" (page_global)); 343 #else /* !CONFIG_SMP */ 344 if (pte_none(*buddy)) 345 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 346 #endif /* CONFIG_SMP */ 347 } 348 } 349 350 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 351 { 352 /* Preserve global status for the pair */ 353 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 354 set_pte(ptep, __pte(_PAGE_GLOBAL)); 355 else 356 set_pte(ptep, __pte(0)); 357 } 358 359 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 360 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 361 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 362 363 extern pgd_t swapper_pg_dir[]; 364 extern pgd_t invalid_pg_dir[]; 365 366 struct page *dmw_virt_to_page(unsigned long kaddr); 367 struct page *tlb_virt_to_page(unsigned long kaddr); 368 369 /* 370 * The following only work if pte_present() is true. 371 * Undefined behaviour if not.. 372 */ 373 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 374 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 375 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 376 377 static inline pte_t pte_mkold(pte_t pte) 378 { 379 pte_val(pte) &= ~_PAGE_ACCESSED; 380 return pte; 381 } 382 383 static inline pte_t pte_mkyoung(pte_t pte) 384 { 385 pte_val(pte) |= _PAGE_ACCESSED; 386 return pte; 387 } 388 389 static inline pte_t pte_mkclean(pte_t pte) 390 { 391 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 392 return pte; 393 } 394 395 static inline pte_t pte_mkdirty(pte_t pte) 396 { 397 pte_val(pte) |= _PAGE_MODIFIED; 398 if (pte_val(pte) & _PAGE_WRITE) 399 pte_val(pte) |= _PAGE_DIRTY; 400 return pte; 401 } 402 403 static inline pte_t pte_mkwrite_novma(pte_t pte) 404 { 405 pte_val(pte) |= _PAGE_WRITE; 406 if (pte_val(pte) & _PAGE_MODIFIED) 407 pte_val(pte) |= _PAGE_DIRTY; 408 return pte; 409 } 410 411 static inline pte_t pte_wrprotect(pte_t pte) 412 { 413 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 414 return pte; 415 } 416 417 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 418 419 static inline pte_t pte_mkhuge(pte_t pte) 420 { 421 pte_val(pte) |= _PAGE_HUGE; 422 return pte; 423 } 424 425 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 426 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 427 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 428 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 429 430 #define pte_accessible pte_accessible 431 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 432 { 433 if (pte_val(a) & _PAGE_PRESENT) 434 return true; 435 436 if ((pte_val(a) & _PAGE_PROTNONE) && 437 atomic_read(&mm->tlb_flush_pending)) 438 return true; 439 440 return false; 441 } 442 443 /* 444 * Conversion functions: convert a page and protection to a page entry, 445 * and a page entry and page directory to the page they refer to. 446 */ 447 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 448 449 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 450 { 451 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 452 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 453 } 454 455 extern void __update_tlb(struct vm_area_struct *vma, 456 unsigned long address, pte_t *ptep); 457 458 static inline void update_mmu_cache_range(struct vm_fault *vmf, 459 struct vm_area_struct *vma, unsigned long address, 460 pte_t *ptep, unsigned int nr) 461 { 462 for (;;) { 463 __update_tlb(vma, address, ptep); 464 if (--nr == 0) 465 break; 466 address += PAGE_SIZE; 467 ptep++; 468 } 469 } 470 #define update_mmu_cache(vma, addr, ptep) \ 471 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 472 473 #define __HAVE_ARCH_UPDATE_MMU_TLB 474 #define update_mmu_tlb update_mmu_cache 475 476 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 477 unsigned long address, pmd_t *pmdp) 478 { 479 __update_tlb(vma, address, (pte_t *)pmdp); 480 } 481 482 static inline unsigned long pmd_pfn(pmd_t pmd) 483 { 484 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 485 } 486 487 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 488 489 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 490 #define pmdp_establish generic_pmdp_establish 491 492 static inline int pmd_trans_huge(pmd_t pmd) 493 { 494 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 495 } 496 497 static inline pmd_t pmd_mkhuge(pmd_t pmd) 498 { 499 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 500 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 501 pmd_val(pmd) |= _PAGE_HUGE; 502 503 return pmd; 504 } 505 506 #define pmd_write pmd_write 507 static inline int pmd_write(pmd_t pmd) 508 { 509 return !!(pmd_val(pmd) & _PAGE_WRITE); 510 } 511 512 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 513 { 514 pmd_val(pmd) |= _PAGE_WRITE; 515 if (pmd_val(pmd) & _PAGE_MODIFIED) 516 pmd_val(pmd) |= _PAGE_DIRTY; 517 return pmd; 518 } 519 520 static inline pmd_t pmd_wrprotect(pmd_t pmd) 521 { 522 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 523 return pmd; 524 } 525 526 static inline int pmd_dirty(pmd_t pmd) 527 { 528 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 529 } 530 531 static inline pmd_t pmd_mkclean(pmd_t pmd) 532 { 533 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 534 return pmd; 535 } 536 537 static inline pmd_t pmd_mkdirty(pmd_t pmd) 538 { 539 pmd_val(pmd) |= _PAGE_MODIFIED; 540 if (pmd_val(pmd) & _PAGE_WRITE) 541 pmd_val(pmd) |= _PAGE_DIRTY; 542 return pmd; 543 } 544 545 #define pmd_young pmd_young 546 static inline int pmd_young(pmd_t pmd) 547 { 548 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 549 } 550 551 static inline pmd_t pmd_mkold(pmd_t pmd) 552 { 553 pmd_val(pmd) &= ~_PAGE_ACCESSED; 554 return pmd; 555 } 556 557 static inline pmd_t pmd_mkyoung(pmd_t pmd) 558 { 559 pmd_val(pmd) |= _PAGE_ACCESSED; 560 return pmd; 561 } 562 563 static inline struct page *pmd_page(pmd_t pmd) 564 { 565 if (pmd_trans_huge(pmd)) 566 return pfn_to_page(pmd_pfn(pmd)); 567 568 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 569 } 570 571 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 572 { 573 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | 574 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK); 575 return pmd; 576 } 577 578 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 579 { 580 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 581 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 582 583 return pmd; 584 } 585 586 /* 587 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 588 * different prototype. 589 */ 590 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 591 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 592 unsigned long address, pmd_t *pmdp) 593 { 594 pmd_t old = *pmdp; 595 596 pmd_clear(pmdp); 597 598 return old; 599 } 600 601 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 602 603 #ifdef CONFIG_NUMA_BALANCING 604 static inline long pte_protnone(pte_t pte) 605 { 606 return (pte_val(pte) & _PAGE_PROTNONE); 607 } 608 609 static inline long pmd_protnone(pmd_t pmd) 610 { 611 return (pmd_val(pmd) & _PAGE_PROTNONE); 612 } 613 #endif /* CONFIG_NUMA_BALANCING */ 614 615 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 616 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 617 618 /* 619 * We provide our own get_unmapped area to cope with the virtual aliasing 620 * constraints placed on us by the cache architecture. 621 */ 622 #define HAVE_ARCH_UNMAPPED_AREA 623 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 624 625 #endif /* !__ASSEMBLY__ */ 626 627 #endif /* _ASM_PGTABLE_H */ 628