arch/arm64/include/asm/pgtable.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_PGTABLE_H
  17 #define __ASM_PGTABLE_H
  18
  19 #include <asm/proc-fns.h>
  20
  21 #include <asm/memory.h>
  22 #include <asm/pgtable-hwdef.h>
  23
  24 /*
  25  * Software defined PTE bits definition.
  26  */
  27 #define PTE_VALID               (_AT(pteval_t, 1) << 0)
  28 #define PTE_FILE                (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
  29 #define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
  30 #define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
  31 #define PTE_WRITE               (_AT(pteval_t, 1) << 57)
  32 #define PTE_PROT_NONE           (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
  33
  34 /*
  35  * VMALLOC and SPARSEMEM_VMEMMAP ranges.
  36  */
  37 #define VMALLOC_START           (UL(0xffffffffffffffff) << VA_BITS)
  38 #define VMALLOC_END             (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
  39
  40 #define vmemmap                 ((struct page *)(VMALLOC_END + SZ_64K))
  41
  42 #define FIRST_USER_ADDRESS      0
  43
  44 #ifndef __ASSEMBLY__
  45 extern void __pte_error(const char *file, int line, unsigned long val);
  46 extern void __pmd_error(const char *file, int line, unsigned long val);
  47 extern void __pgd_error(const char *file, int line, unsigned long val);
  48
  49 #define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
  50 #ifndef CONFIG_ARM64_64K_PAGES
  51 #define pmd_ERROR(pmd)          __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
  52 #endif
  53 #define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
  54
  55 /*
  56  * The pgprot_* and protection_map entries will be fixed up at runtime to
  57  * include the cachable and bufferable bits based on memory policy, as well as
  58  * any architecture dependent bits like global/ASID and SMP shared mapping
  59  * bits.
  60  */
  61 #define _PAGE_DEFAULT           PTE_TYPE_PAGE | PTE_AF
  62
  63 extern pgprot_t pgprot_default;
  64
  65 #define __pgprot_modify(prot,mask,bits) \
  66         __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
  67
  68 #define _MOD_PROT(p, b)         __pgprot_modify(p, 0, b)
  69
  70 #define PAGE_NONE               __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_PXN | PTE_UXN)
  71 #define PAGE_SHARED             _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
  72 #define PAGE_SHARED_EXEC        _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
  73 #define PAGE_COPY               _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  74 #define PAGE_COPY_EXEC          _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
  75 #define PAGE_READONLY           _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  76 #define PAGE_READONLY_EXEC      _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
  77 #define PAGE_KERNEL             _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE)
  78 #define PAGE_KERNEL_EXEC        _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY | PTE_WRITE)
  79
  80 #define PAGE_HYP                _MOD_PROT(pgprot_default, PTE_HYP)
  81 #define PAGE_HYP_DEVICE         __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
  82
  83 #define PAGE_S2                 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY)
  84 #define PAGE_S2_DEVICE          __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN)
  85
  86 #define __PAGE_NONE             __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN)
  87 #define __PAGE_SHARED           __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
  88 #define __PAGE_SHARED_EXEC      __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
  89 #define __PAGE_COPY             __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  90 #define __PAGE_COPY_EXEC        __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
  91 #define __PAGE_READONLY         __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  92 #define __PAGE_READONLY_EXEC    __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
  93
  94 #endif /* __ASSEMBLY__ */
  95
  96 #define __P000  __PAGE_NONE
  97 #define __P001  __PAGE_READONLY
  98 #define __P010  __PAGE_COPY
  99 #define __P011  __PAGE_COPY
 100 #define __P100  __PAGE_READONLY_EXEC
 101 #define __P101  __PAGE_READONLY_EXEC
 102 #define __P110  __PAGE_COPY_EXEC
 103 #define __P111  __PAGE_COPY_EXEC
 104
 105 #define __S000  __PAGE_NONE
 106 #define __S001  __PAGE_READONLY
 107 #define __S010  __PAGE_SHARED
 108 #define __S011  __PAGE_SHARED
 109 #define __S100  __PAGE_READONLY_EXEC
 110 #define __S101  __PAGE_READONLY_EXEC
 111 #define __S110  __PAGE_SHARED_EXEC
 112 #define __S111  __PAGE_SHARED_EXEC
 113
 114 #ifndef __ASSEMBLY__
 115 /*
 116  * ZERO_PAGE is a global shared page that is always zero: used
 117  * for zero-mapped memory areas etc..
 118  */
 119 extern struct page *empty_zero_page;
 120 #define ZERO_PAGE(vaddr)        (empty_zero_page)
 121
 122 #define pte_pfn(pte)            ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
 123
 124 #define pfn_pte(pfn,prot)       (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
 125
 126 #define pte_none(pte)           (!pte_val(pte))
 127 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
 128 #define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
 129 #define pte_offset_kernel(dir,addr)     (pmd_page_vaddr(*(dir)) + pte_index(addr))
 130
 131 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 132 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
 133 #define pte_unmap(pte)                  do { } while (0)
 134 #define pte_unmap_nested(pte)           do { } while (0)
 135
 136 /*
 137  * The following only work if pte_present(). Undefined behaviour otherwise.
 138  */
 139 #define pte_present(pte)        (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
 140 #define pte_dirty(pte)          (!!(pte_val(pte) & PTE_DIRTY))
 141 #define pte_young(pte)          (!!(pte_val(pte) & PTE_AF))
 142 #define pte_special(pte)        (!!(pte_val(pte) & PTE_SPECIAL))
 143 #define pte_write(pte)          (!!(pte_val(pte) & PTE_WRITE))
 144 #define pte_exec(pte)           (!(pte_val(pte) & PTE_UXN))
 145
 146 #define pte_valid_user(pte) \
 147         ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
 148
 149 static inline pte_t pte_wrprotect(pte_t pte)
 150 {
 151         pte_val(pte) &= ~PTE_WRITE;
 152         return pte;
 153 }
 154
 155 static inline pte_t pte_mkwrite(pte_t pte)
 156 {
 157         pte_val(pte) |= PTE_WRITE;
 158         return pte;
 159 }
 160
 161 static inline pte_t pte_mkclean(pte_t pte)
 162 {
 163         pte_val(pte) &= ~PTE_DIRTY;
 164         return pte;
 165 }
 166
 167 static inline pte_t pte_mkdirty(pte_t pte)
 168 {
 169         pte_val(pte) |= PTE_DIRTY;
 170         return pte;
 171 }
 172
 173 static inline pte_t pte_mkold(pte_t pte)
 174 {
 175         pte_val(pte) &= ~PTE_AF;
 176         return pte;
 177 }
 178
 179 static inline pte_t pte_mkyoung(pte_t pte)
 180 {
 181         pte_val(pte) |= PTE_AF;
 182         return pte;
 183 }
 184
 185 static inline pte_t pte_mkspecial(pte_t pte)
 186 {
 187         pte_val(pte) |= PTE_SPECIAL;
 188         return pte;
 189 }
 190
 191 static inline void set_pte(pte_t *ptep, pte_t pte)
 192 {
 193         *ptep = pte;
 194 }
 195
 196 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
 197
 198 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 199                               pte_t *ptep, pte_t pte)
 200 {
 201         if (pte_valid_user(pte)) {
 202                 if (!pte_special(pte) && pte_exec(pte))
 203                         __sync_icache_dcache(pte, addr);
 204                 if (pte_dirty(pte) && pte_write(pte))
 205                         pte_val(pte) &= ~PTE_RDONLY;
 206                 else
 207                         pte_val(pte) |= PTE_RDONLY;
 208         }
 209
 210         set_pte(ptep, pte);
 211 }
 212
 213 /*
 214  * Huge pte definitions.
 215  */
 216 #define pte_huge(pte)           (!(pte_val(pte) & PTE_TABLE_BIT))
 217 #define pte_mkhuge(pte)         (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
 218
 219 /*
 220  * Hugetlb definitions.
 221  */
 222 #define HUGE_MAX_HSTATE         2
 223 #define HPAGE_SHIFT             PMD_SHIFT
 224 #define HPAGE_SIZE              (_AC(1, UL) << HPAGE_SHIFT)
 225 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 226 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 227
 228 #define __HAVE_ARCH_PTE_SPECIAL
 229
 230 static inline pte_t pmd_pte(pmd_t pmd)
 231 {
 232         return __pte(pmd_val(pmd));
 233 }
 234
 235 static inline pmd_t pte_pmd(pte_t pte)
 236 {
 237         return __pmd(pte_val(pte));
 238 }
 239
 240 /*
 241  * THP definitions.
 242  */
 243
 244 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 245 #define pmd_trans_huge(pmd)     (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
 246 #define pmd_trans_splitting(pmd)        pte_special(pmd_pte(pmd))
 247 #endif
 248
 249 #define pmd_young(pmd)          pte_young(pmd_pte(pmd))
 250 #define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
 251 #define pmd_mksplitting(pmd)    pte_pmd(pte_mkspecial(pmd_pte(pmd)))
 252 #define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
 253 #define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
 254 #define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
 255 #define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
 256 #define pmd_mknotpresent(pmd)   (__pmd(pmd_val(pmd) &= ~PMD_TYPE_MASK))
 257
 258 #define __HAVE_ARCH_PMD_WRITE
 259 #define pmd_write(pmd)          pte_write(pmd_pte(pmd))
 260
 261 #define pmd_mkhuge(pmd)         (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
 262
 263 #define pmd_pfn(pmd)            (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
 264 #define pfn_pmd(pfn,prot)       (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
 265 #define mk_pmd(page,prot)       pfn_pmd(page_to_pfn(page),prot)
 266
 267 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
 268
 269 #define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd)
 270
 271 static inline int has_transparent_hugepage(void)
 272 {
 273         return 1;
 274 }
 275
 276 /*
 277  * Mark the prot value as uncacheable and unbufferable.
 278  */
 279 #define pgprot_noncached(prot) \
 280         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
 281 #define pgprot_writecombine(prot) \
 282         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
 283 #define __HAVE_PHYS_MEM_ACCESS_PROT
 284 struct file;
 285 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 286                                      unsigned long size, pgprot_t vma_prot);
 287
 288 #define pmd_none(pmd)           (!pmd_val(pmd))
 289 #define pmd_present(pmd)        (pmd_val(pmd))
 290
 291 #define pmd_bad(pmd)            (!(pmd_val(pmd) & 2))
 292
 293 #define pmd_table(pmd)          ((pmd_val(pmd) & PMD_TYPE_MASK) == \
 294                                  PMD_TYPE_TABLE)
 295 #define pmd_sect(pmd)           ((pmd_val(pmd) & PMD_TYPE_MASK) == \
 296                                  PMD_TYPE_SECT)
 297
 298
 299 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 300 {
 301         *pmdp = pmd;
 302         dsb();
 303 }
 304
 305 static inline void pmd_clear(pmd_t *pmdp)
 306 {
 307         set_pmd(pmdp, __pmd(0));
 308 }
 309
 310 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 311 {
 312         return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
 313 }
 314
 315 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
 316
 317 /*
 318  * Conversion functions: convert a page and protection to a page entry,
 319  * and a page entry and page directory to the page they refer to.
 320  */
 321 #define mk_pte(page,prot)       pfn_pte(page_to_pfn(page),prot)
 322
 323 #ifndef CONFIG_ARM64_64K_PAGES
 324
 325 #define pud_none(pud)           (!pud_val(pud))
 326 #define pud_bad(pud)            (!(pud_val(pud) & 2))
 327 #define pud_present(pud)        (pud_val(pud))
 328
 329 static inline void set_pud(pud_t *pudp, pud_t pud)
 330 {
 331         *pudp = pud;
 332         dsb();
 333 }
 334
 335 static inline void pud_clear(pud_t *pudp)
 336 {
 337         set_pud(pudp, __pud(0));
 338 }
 339
 340 static inline pmd_t *pud_page_vaddr(pud_t pud)
 341 {
 342         return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
 343 }
 344
 345 #endif  /* CONFIG_ARM64_64K_PAGES */
 346
 347 /* to find an entry in a page-table-directory */
 348 #define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 349
 350 #define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
 351
 352 /* to find an entry in a kernel page-table-directory */
 353 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
 354
 355 /* Find an entry in the second-level page table.. */
 356 #ifndef CONFIG_ARM64_64K_PAGES
 357 #define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 358 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 359 {
 360         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
 361 }
 362 #endif
 363
 364 /* Find an entry in the third-level page table.. */
 365 #define pte_index(addr)         (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 366
 367 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 368 {
 369         const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
 370                               PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
 371         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 372         return pte;
 373 }
 374
 375 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 376 {
 377         return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
 378 }
 379
 380 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 381 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 382
 383 #define SWAPPER_DIR_SIZE        (3 * PAGE_SIZE)
 384 #define IDMAP_DIR_SIZE          (2 * PAGE_SIZE)
 385
 386 /*
 387  * Encode and decode a swap entry:
 388  *      bits 0-1:       present (must be zero)
 389  *      bit  2:         PTE_FILE
 390  *      bits 3-8:       swap type
 391  *      bits 9-57:      swap offset
 392  */
 393 #define __SWP_TYPE_SHIFT        3
 394 #define __SWP_TYPE_BITS         6
 395 #define __SWP_OFFSET_BITS       49
 396 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
 397 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
 398 #define __SWP_OFFSET_MASK       ((1UL << __SWP_OFFSET_BITS) - 1)
 399
 400 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
 401 #define __swp_offset(x)         (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
 402 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
 403
 404 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 405 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
 406
 407 /*
 408  * Ensure that there are not more swap files than can be encoded in the kernel
 409  * the PTEs.
 410  */
 411 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
 412
 413 /*
 414  * Encode and decode a file entry:
 415  *      bits 0-1:       present (must be zero)
 416  *      bit  2:         PTE_FILE
 417  *      bits 3-57:      file offset / PAGE_SIZE
 418  */
 419 #define pte_file(pte)           (pte_val(pte) & PTE_FILE)
 420 #define pte_to_pgoff(x)         (pte_val(x) >> 3)
 421 #define pgoff_to_pte(x)         __pte(((x) << 3) | PTE_FILE)
 422
 423 #define PTE_FILE_MAX_BITS       55
 424
 425 extern int kern_addr_valid(unsigned long addr);
 426
 427 #include <asm-generic/pgtable.h>
 428
 429 #define pgtable_cache_init() do { } while (0)
 430
 431 #endif /* !__ASSEMBLY__ */
 432
 433 #endif /* __ASM_PGTABLE_H */