arch/arm64/include/asm/pgtable.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
clear_pte_bit
set_pte_bit
pte_wrprotect
pte_mkwrite
pte_mkclean
pte_mkdirty
pte_mkold
pte_mkyoung
pte_mkspecial
pte_mkcont
pte_mknoncont
pte_mkpresent
pmd_mkcont
pte_mkdevmap
set_pte
__check_racy_pte_update
set_pte_at
pgd_pte
pud_pte
pte_pud
pud_pmd
pmd_pte
pte_pmd
mk_pud_sect_prot
mk_pmd_sect_prot
pte_protnone
pmd_protnone
pmd_mkdevmap
pud_sect
pud_table
in_swapper_pgdir
set_pmd
pmd_clear
pmd_page_paddr
pte_unmap
set_pud
pud_clear
pud_page_paddr
set_pgd
pgd_clear
pgd_page_paddr
pte_modify
pmd_modify
pmdp_set_access_flags
pud_devmap
pgd_devmap
__ptep_test_and_clear_young
ptep_test_and_clear_young
ptep_clear_flush_young
pmdp_test_and_clear_young
ptep_get_and_clear
pmdp_huge_get_and_clear
ptep_set_wrprotect
pmdp_set_wrprotect
pmdp_establish
update_mmu_cache
   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  */
   5 #ifndef __ASM_PGTABLE_H
   6 #define __ASM_PGTABLE_H
   7 
   8 #include <asm/bug.h>
   9 #include <asm/proc-fns.h>
  10 
  11 #include <asm/memory.h>
  12 #include <asm/pgtable-hwdef.h>
  13 #include <asm/pgtable-prot.h>
  14 #include <asm/tlbflush.h>
  15 
  16 /*
  17  * VMALLOC range.
  18  *
  19  * VMALLOC_START: beginning of the kernel vmalloc space
  20  * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space
  21  *      and fixed mappings
  22  */
  23 #define VMALLOC_START           (MODULES_END)
  24 #define VMALLOC_END             (- PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
  25 
  26 #define FIRST_USER_ADDRESS      0UL
  27 
  28 #ifndef __ASSEMBLY__
  29 
  30 #include <asm/cmpxchg.h>
  31 #include <asm/fixmap.h>
  32 #include <linux/mmdebug.h>
  33 #include <linux/mm_types.h>
  34 #include <linux/sched.h>
  35 
  36 extern struct page *vmemmap;
  37 
  38 extern void __pte_error(const char *file, int line, unsigned long val);
  39 extern void __pmd_error(const char *file, int line, unsigned long val);
  40 extern void __pud_error(const char *file, int line, unsigned long val);
  41 extern void __pgd_error(const char *file, int line, unsigned long val);
  42 
  43 /*
  44  * ZERO_PAGE is a global shared page that is always zero: used
  45  * for zero-mapped memory areas etc..
  46  */
  47 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  48 #define ZERO_PAGE(vaddr)        phys_to_page(__pa_symbol(empty_zero_page))
  49 
  50 #define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
  51 
  52 /*
  53  * Macros to convert between a physical address and its placement in a
  54  * page table entry, taking care of 52-bit addresses.
  55  */
  56 #ifdef CONFIG_ARM64_PA_BITS_52
  57 #define __pte_to_phys(pte)      \
  58         ((pte_val(pte) & PTE_ADDR_LOW) | ((pte_val(pte) & PTE_ADDR_HIGH) << 36))
  59 #define __phys_to_pte_val(phys) (((phys) | ((phys) >> 36)) & PTE_ADDR_MASK)
  60 #else
  61 #define __pte_to_phys(pte)      (pte_val(pte) & PTE_ADDR_MASK)
  62 #define __phys_to_pte_val(phys) (phys)
  63 #endif
  64 
  65 #define pte_pfn(pte)            (__pte_to_phys(pte) >> PAGE_SHIFT)
  66 #define pfn_pte(pfn,prot)       \
  67         __pte(__phys_to_pte_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
  68 
  69 #define pte_none(pte)           (!pte_val(pte))
  70 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
  71 #define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
  72 
  73 /*
  74  * The following only work if pte_present(). Undefined behaviour otherwise.
  75  */
  76 #define pte_present(pte)        (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
  77 #define pte_young(pte)          (!!(pte_val(pte) & PTE_AF))
  78 #define pte_special(pte)        (!!(pte_val(pte) & PTE_SPECIAL))
  79 #define pte_write(pte)          (!!(pte_val(pte) & PTE_WRITE))
  80 #define pte_user_exec(pte)      (!(pte_val(pte) & PTE_UXN))
  81 #define pte_cont(pte)           (!!(pte_val(pte) & PTE_CONT))
  82 #define pte_devmap(pte)         (!!(pte_val(pte) & PTE_DEVMAP))
  83 
  84 #define pte_cont_addr_end(addr, end)                                            \
  85 ({      unsigned long __boundary = ((addr) + CONT_PTE_SIZE) & CONT_PTE_MASK;    \
  86         (__boundary - 1 < (end) - 1) ? __boundary : (end);                      \
  87 })
  88 
  89 #define pmd_cont_addr_end(addr, end)                                            \
  90 ({      unsigned long __boundary = ((addr) + CONT_PMD_SIZE) & CONT_PMD_MASK;    \
  91         (__boundary - 1 < (end) - 1) ? __boundary : (end);                      \
  92 })
  93 
  94 #define pte_hw_dirty(pte)       (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY))
  95 #define pte_sw_dirty(pte)       (!!(pte_val(pte) & PTE_DIRTY))
  96 #define pte_dirty(pte)          (pte_sw_dirty(pte) || pte_hw_dirty(pte))
  97 
  98 #define pte_valid(pte)          (!!(pte_val(pte) & PTE_VALID))
  99 #define pte_valid_not_user(pte) \
 100         ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID)
 101 #define pte_valid_young(pte) \
 102         ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF))
 103 #define pte_valid_user(pte) \
 104         ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
 105 
 106 /*
 107  * Could the pte be present in the TLB? We must check mm_tlb_flush_pending
 108  * so that we don't erroneously return false for pages that have been
 109  * remapped as PROT_NONE but are yet to be flushed from the TLB.
 110  */
 111 #define pte_accessible(mm, pte) \
 112         (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte))
 113 
 114 /*
 115  * p??_access_permitted() is true for valid user mappings (subject to the
 116  * write permission check). PROT_NONE mappings do not have the PTE_VALID bit
 117  * set.
 118  */
 119 #define pte_access_permitted(pte, write) \
 120         (pte_valid_user(pte) && (!(write) || pte_write(pte)))
 121 #define pmd_access_permitted(pmd, write) \
 122         (pte_access_permitted(pmd_pte(pmd), (write)))
 123 #define pud_access_permitted(pud, write) \
 124         (pte_access_permitted(pud_pte(pud), (write)))
 125 
 126 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
 127 {
 128         pte_val(pte) &= ~pgprot_val(prot);
 129         return pte;
 130 }
 131 
 132 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
 133 {
 134         pte_val(pte) |= pgprot_val(prot);
 135         return pte;
 136 }
 137 
 138 static inline pte_t pte_wrprotect(pte_t pte)
 139 {
 140         pte = clear_pte_bit(pte, __pgprot(PTE_WRITE));
 141         pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
 142         return pte;
 143 }
 144 
 145 static inline pte_t pte_mkwrite(pte_t pte)
 146 {
 147         pte = set_pte_bit(pte, __pgprot(PTE_WRITE));
 148         pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY));
 149         return pte;
 150 }
 151 
 152 static inline pte_t pte_mkclean(pte_t pte)
 153 {
 154         pte = clear_pte_bit(pte, __pgprot(PTE_DIRTY));
 155         pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
 156 
 157         return pte;
 158 }
 159 
 160 static inline pte_t pte_mkdirty(pte_t pte)
 161 {
 162         pte = set_pte_bit(pte, __pgprot(PTE_DIRTY));
 163 
 164         if (pte_write(pte))
 165                 pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY));
 166 
 167         return pte;
 168 }
 169 
 170 static inline pte_t pte_mkold(pte_t pte)
 171 {
 172         return clear_pte_bit(pte, __pgprot(PTE_AF));
 173 }
 174 
 175 static inline pte_t pte_mkyoung(pte_t pte)
 176 {
 177         return set_pte_bit(pte, __pgprot(PTE_AF));
 178 }
 179 
 180 static inline pte_t pte_mkspecial(pte_t pte)
 181 {
 182         return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
 183 }
 184 
 185 static inline pte_t pte_mkcont(pte_t pte)
 186 {
 187         pte = set_pte_bit(pte, __pgprot(PTE_CONT));
 188         return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE));
 189 }
 190 
 191 static inline pte_t pte_mknoncont(pte_t pte)
 192 {
 193         return clear_pte_bit(pte, __pgprot(PTE_CONT));
 194 }
 195 
 196 static inline pte_t pte_mkpresent(pte_t pte)
 197 {
 198         return set_pte_bit(pte, __pgprot(PTE_VALID));
 199 }
 200 
 201 static inline pmd_t pmd_mkcont(pmd_t pmd)
 202 {
 203         return __pmd(pmd_val(pmd) | PMD_SECT_CONT);
 204 }
 205 
 206 static inline pte_t pte_mkdevmap(pte_t pte)
 207 {
 208         return set_pte_bit(pte, __pgprot(PTE_DEVMAP | PTE_SPECIAL));
 209 }
 210 
 211 static inline void set_pte(pte_t *ptep, pte_t pte)
 212 {
 213         WRITE_ONCE(*ptep, pte);
 214 
 215         /*
 216          * Only if the new pte is valid and kernel, otherwise TLB maintenance
 217          * or update_mmu_cache() have the necessary barriers.
 218          */
 219         if (pte_valid_not_user(pte)) {
 220                 dsb(ishst);
 221                 isb();
 222         }
 223 }
 224 
 225 extern void __sync_icache_dcache(pte_t pteval);
 226 
 227 /*
 228  * PTE bits configuration in the presence of hardware Dirty Bit Management
 229  * (PTE_WRITE == PTE_DBM):
 230  *
 231  * Dirty  Writable | PTE_RDONLY  PTE_WRITE  PTE_DIRTY (sw)
 232  *   0      0      |   1           0          0
 233  *   0      1      |   1           1          0
 234  *   1      0      |   1           0          1
 235  *   1      1      |   0           1          x
 236  *
 237  * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via
 238  * the page fault mechanism. Checking the dirty status of a pte becomes:
 239  *
 240  *   PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY)
 241  */
 242 
 243 static inline void __check_racy_pte_update(struct mm_struct *mm, pte_t *ptep,
 244                                            pte_t pte)
 245 {
 246         pte_t old_pte;
 247 
 248         if (!IS_ENABLED(CONFIG_DEBUG_VM))
 249                 return;
 250 
 251         old_pte = READ_ONCE(*ptep);
 252 
 253         if (!pte_valid(old_pte) || !pte_valid(pte))
 254                 return;
 255         if (mm != current->active_mm && atomic_read(&mm->mm_users) <= 1)
 256                 return;
 257 
 258         /*
 259          * Check for potential race with hardware updates of the pte
 260          * (ptep_set_access_flags safely changes valid ptes without going
 261          * through an invalid entry).
 262          */
 263         VM_WARN_ONCE(!pte_young(pte),
 264                      "%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
 265                      __func__, pte_val(old_pte), pte_val(pte));
 266         VM_WARN_ONCE(pte_write(old_pte) && !pte_dirty(pte),
 267                      "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
 268                      __func__, pte_val(old_pte), pte_val(pte));
 269 }
 270 
 271 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 272                               pte_t *ptep, pte_t pte)
 273 {
 274         if (pte_present(pte) && pte_user_exec(pte) && !pte_special(pte))
 275                 __sync_icache_dcache(pte);
 276 
 277         __check_racy_pte_update(mm, ptep, pte);
 278 
 279         set_pte(ptep, pte);
 280 }
 281 
 282 /*
 283  * Huge pte definitions.
 284  */
 285 #define pte_mkhuge(pte)         (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
 286 
 287 /*
 288  * Hugetlb definitions.
 289  */
 290 #define HUGE_MAX_HSTATE         4
 291 #define HPAGE_SHIFT             PMD_SHIFT
 292 #define HPAGE_SIZE              (_AC(1, UL) << HPAGE_SHIFT)
 293 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 294 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 295 
 296 static inline pte_t pgd_pte(pgd_t pgd)
 297 {
 298         return __pte(pgd_val(pgd));
 299 }
 300 
 301 static inline pte_t pud_pte(pud_t pud)
 302 {
 303         return __pte(pud_val(pud));
 304 }
 305 
 306 static inline pud_t pte_pud(pte_t pte)
 307 {
 308         return __pud(pte_val(pte));
 309 }
 310 
 311 static inline pmd_t pud_pmd(pud_t pud)
 312 {
 313         return __pmd(pud_val(pud));
 314 }
 315 
 316 static inline pte_t pmd_pte(pmd_t pmd)
 317 {
 318         return __pte(pmd_val(pmd));
 319 }
 320 
 321 static inline pmd_t pte_pmd(pte_t pte)
 322 {
 323         return __pmd(pte_val(pte));
 324 }
 325 
 326 static inline pgprot_t mk_pud_sect_prot(pgprot_t prot)
 327 {
 328         return __pgprot((pgprot_val(prot) & ~PUD_TABLE_BIT) | PUD_TYPE_SECT);
 329 }
 330 
 331 static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot)
 332 {
 333         return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT);
 334 }
 335 
 336 #ifdef CONFIG_NUMA_BALANCING
 337 /*
 338  * See the comment in include/asm-generic/pgtable.h
 339  */
 340 static inline int pte_protnone(pte_t pte)
 341 {
 342         return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE;
 343 }
 344 
 345 static inline int pmd_protnone(pmd_t pmd)
 346 {
 347         return pte_protnone(pmd_pte(pmd));
 348 }
 349 #endif
 350 
 351 /*
 352  * THP definitions.
 353  */
 354 
 355 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 356 #define pmd_trans_huge(pmd)     (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
 357 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 358 
 359 #define pmd_present(pmd)        pte_present(pmd_pte(pmd))
 360 #define pmd_dirty(pmd)          pte_dirty(pmd_pte(pmd))
 361 #define pmd_young(pmd)          pte_young(pmd_pte(pmd))
 362 #define pmd_valid(pmd)          pte_valid(pmd_pte(pmd))
 363 #define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
 364 #define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
 365 #define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
 366 #define pmd_mkclean(pmd)        pte_pmd(pte_mkclean(pmd_pte(pmd)))
 367 #define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
 368 #define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
 369 #define pmd_mknotpresent(pmd)   (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID))
 370 
 371 #define pmd_thp_or_huge(pmd)    (pmd_huge(pmd) || pmd_trans_huge(pmd))
 372 
 373 #define pmd_write(pmd)          pte_write(pmd_pte(pmd))
 374 
 375 #define pmd_mkhuge(pmd)         (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
 376 
 377 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 378 #define pmd_devmap(pmd)         pte_devmap(pmd_pte(pmd))
 379 #endif
 380 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
 381 {
 382         return pte_pmd(set_pte_bit(pmd_pte(pmd), __pgprot(PTE_DEVMAP)));
 383 }
 384 
 385 #define __pmd_to_phys(pmd)      __pte_to_phys(pmd_pte(pmd))
 386 #define __phys_to_pmd_val(phys) __phys_to_pte_val(phys)
 387 #define pmd_pfn(pmd)            ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT)
 388 #define pfn_pmd(pfn,prot)       __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 389 #define mk_pmd(page,prot)       pfn_pmd(page_to_pfn(page),prot)
 390 
 391 #define pud_young(pud)          pte_young(pud_pte(pud))
 392 #define pud_mkyoung(pud)        pte_pud(pte_mkyoung(pud_pte(pud)))
 393 #define pud_write(pud)          pte_write(pud_pte(pud))
 394 
 395 #define pud_mkhuge(pud)         (__pud(pud_val(pud) & ~PUD_TABLE_BIT))
 396 
 397 #define __pud_to_phys(pud)      __pte_to_phys(pud_pte(pud))
 398 #define __phys_to_pud_val(phys) __phys_to_pte_val(phys)
 399 #define pud_pfn(pud)            ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT)
 400 #define pfn_pud(pfn,prot)       __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 401 
 402 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd))
 403 
 404 #define __pgd_to_phys(pgd)      __pte_to_phys(pgd_pte(pgd))
 405 #define __phys_to_pgd_val(phys) __phys_to_pte_val(phys)
 406 
 407 #define __pgprot_modify(prot,mask,bits) \
 408         __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
 409 
 410 /*
 411  * Mark the prot value as uncacheable and unbufferable.
 412  */
 413 #define pgprot_noncached(prot) \
 414         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
 415 #define pgprot_writecombine(prot) \
 416         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
 417 #define pgprot_device(prot) \
 418         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
 419 /*
 420  * DMA allocations for non-coherent devices use what the Arm architecture calls
 421  * "Normal non-cacheable" memory, which permits speculation, unaligned accesses
 422  * and merging of writes.  This is different from "Device-nGnR[nE]" memory which
 423  * is intended for MMIO and thus forbids speculation, preserves access size,
 424  * requires strict alignment and can also force write responses to come from the
 425  * endpoint.
 426  */
 427 #define pgprot_dmacoherent(prot) \
 428         __pgprot_modify(prot, PTE_ATTRINDX_MASK, \
 429                         PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
 430 
 431 #define __HAVE_PHYS_MEM_ACCESS_PROT
 432 struct file;
 433 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 434                                      unsigned long size, pgprot_t vma_prot);
 435 
 436 #define pmd_none(pmd)           (!pmd_val(pmd))
 437 
 438 #define pmd_bad(pmd)            (!(pmd_val(pmd) & PMD_TABLE_BIT))
 439 
 440 #define pmd_table(pmd)          ((pmd_val(pmd) & PMD_TYPE_MASK) == \
 441                                  PMD_TYPE_TABLE)
 442 #define pmd_sect(pmd)           ((pmd_val(pmd) & PMD_TYPE_MASK) == \
 443                                  PMD_TYPE_SECT)
 444 
 445 #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
 446 static inline bool pud_sect(pud_t pud) { return false; }
 447 static inline bool pud_table(pud_t pud) { return true; }
 448 #else
 449 #define pud_sect(pud)           ((pud_val(pud) & PUD_TYPE_MASK) == \
 450                                  PUD_TYPE_SECT)
 451 #define pud_table(pud)          ((pud_val(pud) & PUD_TYPE_MASK) == \
 452                                  PUD_TYPE_TABLE)
 453 #endif
 454 
 455 extern pgd_t init_pg_dir[PTRS_PER_PGD];
 456 extern pgd_t init_pg_end[];
 457 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 458 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 459 extern pgd_t tramp_pg_dir[PTRS_PER_PGD];
 460 
 461 extern void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd);
 462 
 463 static inline bool in_swapper_pgdir(void *addr)
 464 {
 465         return ((unsigned long)addr & PAGE_MASK) ==
 466                 ((unsigned long)swapper_pg_dir & PAGE_MASK);
 467 }
 468 
 469 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 470 {
 471 #ifdef __PAGETABLE_PMD_FOLDED
 472         if (in_swapper_pgdir(pmdp)) {
 473                 set_swapper_pgd((pgd_t *)pmdp, __pgd(pmd_val(pmd)));
 474                 return;
 475         }
 476 #endif /* __PAGETABLE_PMD_FOLDED */
 477 
 478         WRITE_ONCE(*pmdp, pmd);
 479 
 480         if (pmd_valid(pmd)) {
 481                 dsb(ishst);
 482                 isb();
 483         }
 484 }
 485 
 486 static inline void pmd_clear(pmd_t *pmdp)
 487 {
 488         set_pmd(pmdp, __pmd(0));
 489 }
 490 
 491 static inline phys_addr_t pmd_page_paddr(pmd_t pmd)
 492 {
 493         return __pmd_to_phys(pmd);
 494 }
 495 
 496 static inline void pte_unmap(pte_t *pte) { }
 497 
 498 /* Find an entry in the third-level page table. */
 499 #define pte_index(addr)         (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 500 
 501 #define pte_offset_phys(dir,addr)       (pmd_page_paddr(READ_ONCE(*(dir))) + pte_index(addr) * sizeof(pte_t))
 502 #define pte_offset_kernel(dir,addr)     ((pte_t *)__va(pte_offset_phys((dir), (addr))))
 503 
 504 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 505 
 506 #define pte_set_fixmap(addr)            ((pte_t *)set_fixmap_offset(FIX_PTE, addr))
 507 #define pte_set_fixmap_offset(pmd, addr)        pte_set_fixmap(pte_offset_phys(pmd, addr))
 508 #define pte_clear_fixmap()              clear_fixmap(FIX_PTE)
 509 
 510 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(__pmd_to_phys(pmd)))
 511 
 512 /* use ONLY for statically allocated translation tables */
 513 #define pte_offset_kimg(dir,addr)       ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr))))
 514 
 515 /*
 516  * Conversion functions: convert a page and protection to a page entry,
 517  * and a page entry and page directory to the page they refer to.
 518  */
 519 #define mk_pte(page,prot)       pfn_pte(page_to_pfn(page),prot)
 520 
 521 #if CONFIG_PGTABLE_LEVELS > 2
 522 
 523 #define pmd_ERROR(pmd)          __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
 524 
 525 #define pud_none(pud)           (!pud_val(pud))
 526 #define pud_bad(pud)            (!(pud_val(pud) & PUD_TABLE_BIT))
 527 #define pud_present(pud)        pte_present(pud_pte(pud))
 528 #define pud_valid(pud)          pte_valid(pud_pte(pud))
 529 
 530 static inline void set_pud(pud_t *pudp, pud_t pud)
 531 {
 532 #ifdef __PAGETABLE_PUD_FOLDED
 533         if (in_swapper_pgdir(pudp)) {
 534                 set_swapper_pgd((pgd_t *)pudp, __pgd(pud_val(pud)));
 535                 return;
 536         }
 537 #endif /* __PAGETABLE_PUD_FOLDED */
 538 
 539         WRITE_ONCE(*pudp, pud);
 540 
 541         if (pud_valid(pud)) {
 542                 dsb(ishst);
 543                 isb();
 544         }
 545 }
 546 
 547 static inline void pud_clear(pud_t *pudp)
 548 {
 549         set_pud(pudp, __pud(0));
 550 }
 551 
 552 static inline phys_addr_t pud_page_paddr(pud_t pud)
 553 {
 554         return __pud_to_phys(pud);
 555 }
 556 
 557 /* Find an entry in the second-level page table. */
 558 #define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 559 
 560 #define pmd_offset_phys(dir, addr)      (pud_page_paddr(READ_ONCE(*(dir))) + pmd_index(addr) * sizeof(pmd_t))
 561 #define pmd_offset(dir, addr)           ((pmd_t *)__va(pmd_offset_phys((dir), (addr))))
 562 
 563 #define pmd_set_fixmap(addr)            ((pmd_t *)set_fixmap_offset(FIX_PMD, addr))
 564 #define pmd_set_fixmap_offset(pud, addr)        pmd_set_fixmap(pmd_offset_phys(pud, addr))
 565 #define pmd_clear_fixmap()              clear_fixmap(FIX_PMD)
 566 
 567 #define pud_page(pud)           pfn_to_page(__phys_to_pfn(__pud_to_phys(pud)))
 568 
 569 /* use ONLY for statically allocated translation tables */
 570 #define pmd_offset_kimg(dir,addr)       ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr))))
 571 
 572 #else
 573 
 574 #define pud_page_paddr(pud)     ({ BUILD_BUG(); 0; })
 575 
 576 /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */
 577 #define pmd_set_fixmap(addr)            NULL
 578 #define pmd_set_fixmap_offset(pudp, addr)       ((pmd_t *)pudp)
 579 #define pmd_clear_fixmap()
 580 
 581 #define pmd_offset_kimg(dir,addr)       ((pmd_t *)dir)
 582 
 583 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 584 
 585 #if CONFIG_PGTABLE_LEVELS > 3
 586 
 587 #define pud_ERROR(pud)          __pud_error(__FILE__, __LINE__, pud_val(pud))
 588 
 589 #define pgd_none(pgd)           (!pgd_val(pgd))
 590 #define pgd_bad(pgd)            (!(pgd_val(pgd) & 2))
 591 #define pgd_present(pgd)        (pgd_val(pgd))
 592 
 593 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 594 {
 595         if (in_swapper_pgdir(pgdp)) {
 596                 set_swapper_pgd(pgdp, pgd);
 597                 return;
 598         }
 599 
 600         WRITE_ONCE(*pgdp, pgd);
 601         dsb(ishst);
 602         isb();
 603 }
 604 
 605 static inline void pgd_clear(pgd_t *pgdp)
 606 {
 607         set_pgd(pgdp, __pgd(0));
 608 }
 609 
 610 static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
 611 {
 612         return __pgd_to_phys(pgd);
 613 }
 614 
 615 /* Find an entry in the frst-level page table. */
 616 #define pud_index(addr)         (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
 617 
 618 #define pud_offset_phys(dir, addr)      (pgd_page_paddr(READ_ONCE(*(dir))) + pud_index(addr) * sizeof(pud_t))
 619 #define pud_offset(dir, addr)           ((pud_t *)__va(pud_offset_phys((dir), (addr))))
 620 
 621 #define pud_set_fixmap(addr)            ((pud_t *)set_fixmap_offset(FIX_PUD, addr))
 622 #define pud_set_fixmap_offset(pgd, addr)        pud_set_fixmap(pud_offset_phys(pgd, addr))
 623 #define pud_clear_fixmap()              clear_fixmap(FIX_PUD)
 624 
 625 #define pgd_page(pgd)           pfn_to_page(__phys_to_pfn(__pgd_to_phys(pgd)))
 626 
 627 /* use ONLY for statically allocated translation tables */
 628 #define pud_offset_kimg(dir,addr)       ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr))))
 629 
 630 #else
 631 
 632 #define pgd_page_paddr(pgd)     ({ BUILD_BUG(); 0;})
 633 
 634 /* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */
 635 #define pud_set_fixmap(addr)            NULL
 636 #define pud_set_fixmap_offset(pgdp, addr)       ((pud_t *)pgdp)
 637 #define pud_clear_fixmap()
 638 
 639 #define pud_offset_kimg(dir,addr)       ((pud_t *)dir)
 640 
 641 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 642 
 643 #define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
 644 
 645 /* to find an entry in a page-table-directory */
 646 #define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 647 
 648 #define pgd_offset_raw(pgd, addr)       ((pgd) + pgd_index(addr))
 649 
 650 #define pgd_offset(mm, addr)    (pgd_offset_raw((mm)->pgd, (addr)))
 651 
 652 /* to find an entry in a kernel page-table-directory */
 653 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
 654 
 655 #define pgd_set_fixmap(addr)    ((pgd_t *)set_fixmap_offset(FIX_PGD, addr))
 656 #define pgd_clear_fixmap()      clear_fixmap(FIX_PGD)
 657 
 658 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 659 {
 660         const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
 661                               PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
 662         /* preserve the hardware dirty information */
 663         if (pte_hw_dirty(pte))
 664                 pte = pte_mkdirty(pte);
 665         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 666         return pte;
 667 }
 668 
 669 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 670 {
 671         return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
 672 }
 673 
 674 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 675 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 676                                  unsigned long address, pte_t *ptep,
 677                                  pte_t entry, int dirty);
 678 
 679 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 680 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 681 static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
 682                                         unsigned long address, pmd_t *pmdp,
 683                                         pmd_t entry, int dirty)
 684 {
 685         return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);
 686 }
 687 
 688 static inline int pud_devmap(pud_t pud)
 689 {
 690         return 0;
 691 }
 692 
 693 static inline int pgd_devmap(pgd_t pgd)
 694 {
 695         return 0;
 696 }
 697 #endif
 698 
 699 /*
 700  * Atomic pte/pmd modifications.
 701  */
 702 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 703 static inline int __ptep_test_and_clear_young(pte_t *ptep)
 704 {
 705         pte_t old_pte, pte;
 706 
 707         pte = READ_ONCE(*ptep);
 708         do {
 709                 old_pte = pte;
 710                 pte = pte_mkold(pte);
 711                 pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep),
 712                                                pte_val(old_pte), pte_val(pte));
 713         } while (pte_val(pte) != pte_val(old_pte));
 714 
 715         return pte_young(pte);
 716 }
 717 
 718 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
 719                                             unsigned long address,
 720                                             pte_t *ptep)
 721 {
 722         return __ptep_test_and_clear_young(ptep);
 723 }
 724 
 725 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 726 static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
 727                                          unsigned long address, pte_t *ptep)
 728 {
 729         int young = ptep_test_and_clear_young(vma, address, ptep);
 730 
 731         if (young) {
 732                 /*
 733                  * We can elide the trailing DSB here since the worst that can
 734                  * happen is that a CPU continues to use the young entry in its
 735                  * TLB and we mistakenly reclaim the associated page. The
 736                  * window for such an event is bounded by the next
 737                  * context-switch, which provides a DSB to complete the TLB
 738                  * invalidation.
 739                  */
 740                 flush_tlb_page_nosync(vma, address);
 741         }
 742 
 743         return young;
 744 }
 745 
 746 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 747 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 748 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 749                                             unsigned long address,
 750                                             pmd_t *pmdp)
 751 {
 752         return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
 753 }
 754 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 755 
 756 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 757 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 758                                        unsigned long address, pte_t *ptep)
 759 {
 760         return __pte(xchg_relaxed(&pte_val(*ptep), 0));
 761 }
 762 
 763 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 764 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 765 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 766                                             unsigned long address, pmd_t *pmdp)
 767 {
 768         return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp));
 769 }
 770 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 771 
 772 /*
 773  * ptep_set_wrprotect - mark read-only while trasferring potential hardware
 774  * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit.
 775  */
 776 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 777 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
 778 {
 779         pte_t old_pte, pte;
 780 
 781         pte = READ_ONCE(*ptep);
 782         do {
 783                 old_pte = pte;
 784                 /*
 785                  * If hardware-dirty (PTE_WRITE/DBM bit set and PTE_RDONLY
 786                  * clear), set the PTE_DIRTY bit.
 787                  */
 788                 if (pte_hw_dirty(pte))
 789                         pte = pte_mkdirty(pte);
 790                 pte = pte_wrprotect(pte);
 791                 pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep),
 792                                                pte_val(old_pte), pte_val(pte));
 793         } while (pte_val(pte) != pte_val(old_pte));
 794 }
 795 
 796 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 797 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 798 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 799                                       unsigned long address, pmd_t *pmdp)
 800 {
 801         ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
 802 }
 803 
 804 #define pmdp_establish pmdp_establish
 805 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
 806                 unsigned long address, pmd_t *pmdp, pmd_t pmd)
 807 {
 808         return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd)));
 809 }
 810 #endif
 811 
 812 /*
 813  * Encode and decode a swap entry:
 814  *      bits 0-1:       present (must be zero)
 815  *      bits 2-7:       swap type
 816  *      bits 8-57:      swap offset
 817  *      bit  58:        PTE_PROT_NONE (must be zero)
 818  */
 819 #define __SWP_TYPE_SHIFT        2
 820 #define __SWP_TYPE_BITS         6
 821 #define __SWP_OFFSET_BITS       50
 822 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
 823 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
 824 #define __SWP_OFFSET_MASK       ((1UL << __SWP_OFFSET_BITS) - 1)
 825 
 826 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
 827 #define __swp_offset(x)         (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
 828 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
 829 
 830 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 831 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
 832 
 833 /*
 834  * Ensure that there are not more swap files than can be encoded in the kernel
 835  * PTEs.
 836  */
 837 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
 838 
 839 extern int kern_addr_valid(unsigned long addr);
 840 
 841 #include <asm-generic/pgtable.h>
 842 
 843 /*
 844  * On AArch64, the cache coherency is handled via the set_pte_at() function.
 845  */
 846 static inline void update_mmu_cache(struct vm_area_struct *vma,
 847                                     unsigned long addr, pte_t *ptep)
 848 {
 849         /*
 850          * We don't do anything here, so there's a very small chance of
 851          * us retaking a user fault which we just fixed up. The alternative
 852          * is doing a dsb(ishst), but that penalises the fastpath.
 853          */
 854 }
 855 
 856 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
 857 
 858 #ifdef CONFIG_ARM64_PA_BITS_52
 859 #define phys_to_ttbr(addr)      (((addr) | ((addr) >> 46)) & TTBR_BADDR_MASK_52)
 860 #else
 861 #define phys_to_ttbr(addr)      (addr)
 862 #endif
 863 
 864 #endif /* !__ASSEMBLY__ */
 865 
 866 #endif /* __ASM_PGTABLE_H */
/* [<][>][^][v][top][bottom][index][help] */
root/arch/arm64/include/asm/pgtable.h

INCLUDED FROM

DEFINITIONS
