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 65struct mm_struct; 66struct 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 73extern 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 122extern pte_t invalid_pte_table[PTRS_PER_PTE]; 123 124#ifndef __PAGETABLE_PUD_FOLDED 125 126typedef struct { unsigned long pud; } pud_t; 127#define pud_val(x) ((x).pud) 128#define __pud(x) ((pud_t) { (x) }) 129 130extern pud_t invalid_pud_table[PTRS_PER_PUD]; 131 132/* 133 * Empty pgd/p4d entries point to the invalid_pud_table. 134 */ 135static inline int p4d_none(p4d_t p4d) 136{ 137 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 138} 139 140static inline int p4d_bad(p4d_t p4d) 141{ 142 return p4d_val(p4d) & ~PAGE_MASK; 143} 144 145static inline int p4d_present(p4d_t p4d) 146{ 147 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 148} 149 150static inline void p4d_clear(p4d_t *p4dp) 151{ 152 p4d_val(*p4dp) = (unsigned long)invalid_pud_table; 153} 154 155static inline pud_t *p4d_pgtable(p4d_t p4d) 156{ 157 return (pud_t *)p4d_val(p4d); 158} 159 160static 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 172typedef struct { unsigned long pmd; } pmd_t; 173#define pmd_val(x) ((x).pmd) 174#define __pmd(x) ((pmd_t) { (x) }) 175 176extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 177 178/* 179 * Empty pud entries point to the invalid_pmd_table. 180 */ 181static inline int pud_none(pud_t pud) 182{ 183 return pud_val(pud) == (unsigned long)invalid_pmd_table; 184} 185 186static inline int pud_bad(pud_t pud) 187{ 188 return pud_val(pud) & ~PAGE_MASK; 189} 190 191static inline int pud_present(pud_t pud) 192{ 193 return pud_val(pud) != (unsigned long)invalid_pmd_table; 194} 195 196static inline void pud_clear(pud_t *pudp) 197{ 198 pud_val(*pudp) = ((unsigned long)invalid_pmd_table); 199} 200 201static 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 */ 216static inline int pmd_none(pmd_t pmd) 217{ 218 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 219} 220 221static inline int pmd_bad(pmd_t pmd) 222{ 223 return (pmd_val(pmd) & ~PAGE_MASK); 224} 225 226static 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 234static 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 249extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 250extern 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 */ 260extern void pgd_init(void *addr); 261extern void pud_init(void *addr); 262extern 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 */ 281static 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 292static inline int pte_swp_exclusive(pte_t pte) 293{ 294 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 295} 296 297static inline pte_t pte_swp_mkexclusive(pte_t pte) 298{ 299 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 300 return pte; 301} 302 303static inline pte_t pte_swp_clear_exclusive(pte_t pte) 304{ 305 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 306 return pte; 307} 308 309extern 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 315static 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 350static 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 363extern pgd_t swapper_pg_dir[]; 364extern pgd_t invalid_pg_dir[]; 365 366/* 367 * The following only work if pte_present() is true. 368 * Undefined behaviour if not.. 369 */ 370static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 371static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 372static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); } 373 374static inline pte_t pte_mkold(pte_t pte) 375{ 376 pte_val(pte) &= ~_PAGE_ACCESSED; 377 return pte; 378} 379 380static inline pte_t pte_mkyoung(pte_t pte) 381{ 382 pte_val(pte) |= _PAGE_ACCESSED; 383 return pte; 384} 385 386static inline pte_t pte_mkclean(pte_t pte) 387{ 388 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 389 return pte; 390} 391 392static inline pte_t pte_mkdirty(pte_t pte) 393{ 394 pte_val(pte) |= _PAGE_MODIFIED; 395 if (pte_val(pte) & _PAGE_WRITE) 396 pte_val(pte) |= _PAGE_DIRTY; 397 return pte; 398} 399 400static inline pte_t pte_mkwrite_novma(pte_t pte) 401{ 402 pte_val(pte) |= _PAGE_WRITE; 403 if (pte_val(pte) & _PAGE_MODIFIED) 404 pte_val(pte) |= _PAGE_DIRTY; 405 return pte; 406} 407 408static inline pte_t pte_wrprotect(pte_t pte) 409{ 410 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 411 return pte; 412} 413 414static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 415 416static inline pte_t pte_mkhuge(pte_t pte) 417{ 418 pte_val(pte) |= _PAGE_HUGE; 419 return pte; 420} 421 422#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 423static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 424static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 425#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 426 427#define pte_accessible pte_accessible 428static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 429{ 430 if (pte_val(a) & _PAGE_PRESENT) 431 return true; 432 433 if ((pte_val(a) & _PAGE_PROTNONE) && 434 atomic_read(&mm->tlb_flush_pending)) 435 return true; 436 437 return false; 438} 439 440/* 441 * Conversion functions: convert a page and protection to a page entry, 442 * and a page entry and page directory to the page they refer to. 443 */ 444#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 445 446static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 447{ 448 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 449 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 450} 451 452extern void __update_tlb(struct vm_area_struct *vma, 453 unsigned long address, pte_t *ptep); 454 455static inline void update_mmu_cache_range(struct vm_fault *vmf, 456 struct vm_area_struct *vma, unsigned long address, 457 pte_t *ptep, unsigned int nr) 458{ 459 for (;;) { 460 __update_tlb(vma, address, ptep); 461 if (--nr == 0) 462 break; 463 address += PAGE_SIZE; 464 ptep++; 465 } 466} 467#define update_mmu_cache(vma, addr, ptep) \ 468 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 469 470#define __HAVE_ARCH_UPDATE_MMU_TLB 471#define update_mmu_tlb update_mmu_cache 472 473static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 474 unsigned long address, pmd_t *pmdp) 475{ 476 __update_tlb(vma, address, (pte_t *)pmdp); 477} 478 479static inline unsigned long pmd_pfn(pmd_t pmd) 480{ 481 return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT; 482} 483 484#ifdef CONFIG_TRANSPARENT_HUGEPAGE 485 486/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 487#define pmdp_establish generic_pmdp_establish 488 489static inline int pmd_trans_huge(pmd_t pmd) 490{ 491 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 492} 493 494static inline pmd_t pmd_mkhuge(pmd_t pmd) 495{ 496 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 497 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 498 pmd_val(pmd) |= _PAGE_HUGE; 499 500 return pmd; 501} 502 503#define pmd_write pmd_write 504static inline int pmd_write(pmd_t pmd) 505{ 506 return !!(pmd_val(pmd) & _PAGE_WRITE); 507} 508 509static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) 510{ 511 pmd_val(pmd) |= _PAGE_WRITE; 512 if (pmd_val(pmd) & _PAGE_MODIFIED) 513 pmd_val(pmd) |= _PAGE_DIRTY; 514 return pmd; 515} 516 517static inline pmd_t pmd_wrprotect(pmd_t pmd) 518{ 519 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 520 return pmd; 521} 522 523#define pmd_dirty pmd_dirty 524static inline int pmd_dirty(pmd_t pmd) 525{ 526 return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED)); 527} 528 529static inline pmd_t pmd_mkclean(pmd_t pmd) 530{ 531 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 532 return pmd; 533} 534 535static inline pmd_t pmd_mkdirty(pmd_t pmd) 536{ 537 pmd_val(pmd) |= _PAGE_MODIFIED; 538 if (pmd_val(pmd) & _PAGE_WRITE) 539 pmd_val(pmd) |= _PAGE_DIRTY; 540 return pmd; 541} 542 543#define pmd_young pmd_young 544static inline int pmd_young(pmd_t pmd) 545{ 546 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 547} 548 549static inline pmd_t pmd_mkold(pmd_t pmd) 550{ 551 pmd_val(pmd) &= ~_PAGE_ACCESSED; 552 return pmd; 553} 554 555static inline pmd_t pmd_mkyoung(pmd_t pmd) 556{ 557 pmd_val(pmd) |= _PAGE_ACCESSED; 558 return pmd; 559} 560 561static inline struct page *pmd_page(pmd_t pmd) 562{ 563 if (pmd_trans_huge(pmd)) 564 return pfn_to_page(pmd_pfn(pmd)); 565 566 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 567} 568 569static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 570{ 571 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | 572 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK); 573 return pmd; 574} 575 576static inline pmd_t pmd_mkinvalid(pmd_t pmd) 577{ 578 pmd_val(pmd) |= _PAGE_PRESENT_INVALID; 579 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 580 581 return pmd; 582} 583 584/* 585 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 586 * different prototype. 587 */ 588#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 589static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 590 unsigned long address, pmd_t *pmdp) 591{ 592 pmd_t old = *pmdp; 593 594 pmd_clear(pmdp); 595 596 return old; 597} 598 599#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 600 601#ifdef CONFIG_NUMA_BALANCING 602static inline long pte_protnone(pte_t pte) 603{ 604 return (pte_val(pte) & _PAGE_PROTNONE); 605} 606 607static inline long pmd_protnone(pmd_t pmd) 608{ 609 return (pmd_val(pmd) & _PAGE_PROTNONE); 610} 611#endif /* CONFIG_NUMA_BALANCING */ 612 613#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) 614#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) 615 616/* 617 * We provide our own get_unmapped area to cope with the virtual aliasing 618 * constraints placed on us by the cache architecture. 619 */ 620#define HAVE_ARCH_UNMAPPED_AREA 621#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 622 623#endif /* !__ASSEMBLY__ */ 624 625#endif /* _ASM_PGTABLE_H */ 626