include/asm-x86/pgtable.h

   1 #ifndef _ASM_X86_PGTABLE_H
   2 #define _ASM_X86_PGTABLE_H
   3
   4 #define FIRST_USER_ADDRESS      0
   5
   6 #define _PAGE_BIT_PRESENT       0       /* is present */
   7 #define _PAGE_BIT_RW            1       /* writeable */
   8 #define _PAGE_BIT_USER          2       /* userspace addressable */
   9 #define _PAGE_BIT_PWT           3       /* page write through */
  10 #define _PAGE_BIT_PCD           4       /* page cache disabled */
  11 #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  12 #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  13 #define _PAGE_BIT_FILE          6
  14 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  15 #define _PAGE_BIT_PAT           7       /* on 4KB pages */
  16 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  17 #define _PAGE_BIT_UNUSED1       9       /* available for programmer */
  18 #define _PAGE_BIT_UNUSED2       10
  19 #define _PAGE_BIT_UNUSED3       11
  20 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  21 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
  22
  23 /*
  24  * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
  25  * sign-extended value on 32-bit with all 1's in the upper word,
  26  * which preserves the upper pte values on 64-bit ptes:
  27  */
  28 #define _PAGE_PRESENT   (_AC(1, L)<<_PAGE_BIT_PRESENT)
  29 #define _PAGE_RW        (_AC(1, L)<<_PAGE_BIT_RW)
  30 #define _PAGE_USER      (_AC(1, L)<<_PAGE_BIT_USER)
  31 #define _PAGE_PWT       (_AC(1, L)<<_PAGE_BIT_PWT)
  32 #define _PAGE_PCD       (_AC(1, L)<<_PAGE_BIT_PCD)
  33 #define _PAGE_ACCESSED  (_AC(1, L)<<_PAGE_BIT_ACCESSED)
  34 #define _PAGE_DIRTY     (_AC(1, L)<<_PAGE_BIT_DIRTY)
  35 #define _PAGE_PSE       (_AC(1, L)<<_PAGE_BIT_PSE)      /* 2MB page */
  36 #define _PAGE_GLOBAL    (_AC(1, L)<<_PAGE_BIT_GLOBAL)   /* Global TLB entry */
  37 #define _PAGE_UNUSED1   (_AC(1, L)<<_PAGE_BIT_UNUSED1)
  38 #define _PAGE_UNUSED2   (_AC(1, L)<<_PAGE_BIT_UNUSED2)
  39 #define _PAGE_UNUSED3   (_AC(1, L)<<_PAGE_BIT_UNUSED3)
  40 #define _PAGE_PAT       (_AC(1, L)<<_PAGE_BIT_PAT)
  41 #define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)
  42
  43 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  44 #define _PAGE_NX        (_AC(1, ULL) << _PAGE_BIT_NX)
  45 #else
  46 #define _PAGE_NX        0
  47 #endif
  48
  49 /* If _PAGE_PRESENT is clear, we use these: */
  50 #define _PAGE_FILE      _PAGE_DIRTY     /* nonlinear file mapping,
  51                                          * saved PTE; unset:swap */
  52 #define _PAGE_PROTNONE  _PAGE_PSE       /* if the user mapped it with PROT_NONE;
  53                                            pte_present gives true */
  54
  55 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  56                          _PAGE_ACCESSED | _PAGE_DIRTY)
  57 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  58                          _PAGE_DIRTY)
  59
  60 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
  61
  62 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
  63 #define _PAGE_CACHE_WB          (0)
  64 #define _PAGE_CACHE_WC          (_PAGE_PWT)
  65 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
  66 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
  67
  68 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  69 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  70                                  _PAGE_ACCESSED | _PAGE_NX)
  71
  72 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  73                                          _PAGE_USER | _PAGE_ACCESSED)
  74 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  75                                          _PAGE_ACCESSED | _PAGE_NX)
  76 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  77                                          _PAGE_ACCESSED)
  78 #define PAGE_COPY               PAGE_COPY_NOEXEC
  79 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  80                                          _PAGE_ACCESSED | _PAGE_NX)
  81 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  82                                          _PAGE_ACCESSED)
  83
  84 #ifdef CONFIG_X86_32
  85 #define _PAGE_KERNEL_EXEC \
  86         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
  87 #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
  88
  89 #ifndef __ASSEMBLY__
  90 extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
  91 #endif  /* __ASSEMBLY__ */
  92 #else
  93 #define __PAGE_KERNEL_EXEC                                              \
  94         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
  95 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  96 #endif
  97
  98 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
  99 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 100 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
 101 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
 102 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 103 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 104 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 105 #define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
 106 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 107 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 108
 109 #ifdef CONFIG_X86_32
 110 # define MAKE_GLOBAL(x)                 __pgprot((x))
 111 #else
 112 # define MAKE_GLOBAL(x)                 __pgprot((x) | _PAGE_GLOBAL)
 113 #endif
 114
 115 #define PAGE_KERNEL                     MAKE_GLOBAL(__PAGE_KERNEL)
 116 #define PAGE_KERNEL_RO                  MAKE_GLOBAL(__PAGE_KERNEL_RO)
 117 #define PAGE_KERNEL_EXEC                MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
 118 #define PAGE_KERNEL_RX                  MAKE_GLOBAL(__PAGE_KERNEL_RX)
 119 #define PAGE_KERNEL_WC                  MAKE_GLOBAL(__PAGE_KERNEL_WC)
 120 #define PAGE_KERNEL_NOCACHE             MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 121 #define PAGE_KERNEL_UC_MINUS            MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
 122 #define PAGE_KERNEL_EXEC_NOCACHE        MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
 123 #define PAGE_KERNEL_LARGE               MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
 124 #define PAGE_KERNEL_LARGE_EXEC          MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
 125 #define PAGE_KERNEL_VSYSCALL            MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
 126 #define PAGE_KERNEL_VSYSCALL_NOCACHE    MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 127
 128 /*         xwr */
 129 #define __P000  PAGE_NONE
 130 #define __P001  PAGE_READONLY
 131 #define __P010  PAGE_COPY
 132 #define __P011  PAGE_COPY
 133 #define __P100  PAGE_READONLY_EXEC
 134 #define __P101  PAGE_READONLY_EXEC
 135 #define __P110  PAGE_COPY_EXEC
 136 #define __P111  PAGE_COPY_EXEC
 137
 138 #define __S000  PAGE_NONE
 139 #define __S001  PAGE_READONLY
 140 #define __S010  PAGE_SHARED
 141 #define __S011  PAGE_SHARED
 142 #define __S100  PAGE_READONLY_EXEC
 143 #define __S101  PAGE_READONLY_EXEC
 144 #define __S110  PAGE_SHARED_EXEC
 145 #define __S111  PAGE_SHARED_EXEC
 146
 147 #ifndef __ASSEMBLY__
 148
 149 /*
 150  * ZERO_PAGE is a global shared page that is always zero: used
 151  * for zero-mapped memory areas etc..
 152  */
 153 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 154 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 155
 156 extern spinlock_t pgd_lock;
 157 extern struct list_head pgd_list;
 158
 159 /*
 160  * The following only work if pte_present() is true.
 161  * Undefined behaviour if not..
 162  */
 163 static inline int pte_dirty(pte_t pte)
 164 {
 165         return pte_val(pte) & _PAGE_DIRTY;
 166 }
 167
 168 static inline int pte_young(pte_t pte)
 169 {
 170         return pte_val(pte) & _PAGE_ACCESSED;
 171 }
 172
 173 static inline int pte_write(pte_t pte)
 174 {
 175         return pte_val(pte) & _PAGE_RW;
 176 }
 177
 178 static inline int pte_file(pte_t pte)
 179 {
 180         return pte_val(pte) & _PAGE_FILE;
 181 }
 182
 183 static inline int pte_huge(pte_t pte)
 184 {
 185         return pte_val(pte) & _PAGE_PSE;
 186 }
 187
 188 static inline int pte_global(pte_t pte)
 189 {
 190         return pte_val(pte) & _PAGE_GLOBAL;
 191 }
 192
 193 static inline int pte_exec(pte_t pte)
 194 {
 195         return !(pte_val(pte) & _PAGE_NX);
 196 }
 197
 198 static inline int pmd_large(pmd_t pte)
 199 {
 200         return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 201                 (_PAGE_PSE | _PAGE_PRESENT);
 202 }
 203
 204 static inline pte_t pte_mkclean(pte_t pte)
 205 {
 206         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY);
 207 }
 208
 209 static inline pte_t pte_mkold(pte_t pte)
 210 {
 211         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED);
 212 }
 213
 214 static inline pte_t pte_wrprotect(pte_t pte)
 215 {
 216         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW);
 217 }
 218
 219 static inline pte_t pte_mkexec(pte_t pte)
 220 {
 221         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX);
 222 }
 223
 224 static inline pte_t pte_mkdirty(pte_t pte)
 225 {
 226         return __pte(pte_val(pte) | _PAGE_DIRTY);
 227 }
 228
 229 static inline pte_t pte_mkyoung(pte_t pte)
 230 {
 231         return __pte(pte_val(pte) | _PAGE_ACCESSED);
 232 }
 233
 234 static inline pte_t pte_mkwrite(pte_t pte)
 235 {
 236         return __pte(pte_val(pte) | _PAGE_RW);
 237 }
 238
 239 static inline pte_t pte_mkhuge(pte_t pte)
 240 {
 241         return __pte(pte_val(pte) | _PAGE_PSE);
 242 }
 243
 244 static inline pte_t pte_clrhuge(pte_t pte)
 245 {
 246         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE);
 247 }
 248
 249 static inline pte_t pte_mkglobal(pte_t pte)
 250 {
 251         return __pte(pte_val(pte) | _PAGE_GLOBAL);
 252 }
 253
 254 static inline pte_t pte_clrglobal(pte_t pte)
 255 {
 256         return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL);
 257 }
 258
 259 extern pteval_t __supported_pte_mask;
 260
 261 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 262 {
 263         return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
 264                       pgprot_val(pgprot)) & __supported_pte_mask);
 265 }
 266
 267 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 268 {
 269         return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
 270                       pgprot_val(pgprot)) & __supported_pte_mask);
 271 }
 272
 273 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 274 {
 275         pteval_t val = pte_val(pte);
 276
 277         /*
 278          * Chop off the NX bit (if present), and add the NX portion of
 279          * the newprot (if present):
 280          */
 281         val &= _PAGE_CHG_MASK & ~_PAGE_NX;
 282         val |= pgprot_val(newprot) & __supported_pte_mask;
 283
 284         return __pte(val);
 285 }
 286
 287 #define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
 288
 289 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
 290
 291 #ifndef __ASSEMBLY__
 292 #define __HAVE_PHYS_MEM_ACCESS_PROT
 293 struct file;
 294 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 295                               unsigned long size, pgprot_t vma_prot);
 296 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 297                               unsigned long size, pgprot_t *vma_prot);
 298 #endif
 299
 300 #ifdef CONFIG_PARAVIRT
 301 #include <asm/paravirt.h>
 302 #else  /* !CONFIG_PARAVIRT */
 303 #define set_pte(ptep, pte)              native_set_pte(ptep, pte)
 304 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
 305
 306 #define set_pte_present(mm, addr, ptep, pte)                            \
 307         native_set_pte_present(mm, addr, ptep, pte)
 308 #define set_pte_atomic(ptep, pte)                                       \
 309         native_set_pte_atomic(ptep, pte)
 310
 311 #define set_pmd(pmdp, pmd)              native_set_pmd(pmdp, pmd)
 312
 313 #ifndef __PAGETABLE_PUD_FOLDED
 314 #define set_pgd(pgdp, pgd)              native_set_pgd(pgdp, pgd)
 315 #define pgd_clear(pgd)                  native_pgd_clear(pgd)
 316 #endif
 317
 318 #ifndef set_pud
 319 # define set_pud(pudp, pud)             native_set_pud(pudp, pud)
 320 #endif
 321
 322 #ifndef __PAGETABLE_PMD_FOLDED
 323 #define pud_clear(pud)                  native_pud_clear(pud)
 324 #endif
 325
 326 #define pte_clear(mm, addr, ptep)       native_pte_clear(mm, addr, ptep)
 327 #define pmd_clear(pmd)                  native_pmd_clear(pmd)
 328
 329 #define pte_update(mm, addr, ptep)              do { } while (0)
 330 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 331 #endif  /* CONFIG_PARAVIRT */
 332
 333 #endif  /* __ASSEMBLY__ */
 334
 335 #ifdef CONFIG_X86_32
 336 # include "pgtable_32.h"
 337 #else
 338 # include "pgtable_64.h"
 339 #endif
 340
 341 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 342 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 343
 344 #ifndef __ASSEMBLY__
 345
 346 enum {
 347         PG_LEVEL_NONE,
 348         PG_LEVEL_4K,
 349         PG_LEVEL_2M,
 350         PG_LEVEL_1G,
 351 };
 352
 353 /*
 354  * Helper function that returns the kernel pagetable entry controlling
 355  * the virtual address 'address'. NULL means no pagetable entry present.
 356  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 357  * as a pte too.
 358  */
 359 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 360
 361 /* local pte updates need not use xchg for locking */
 362 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 363 {
 364         pte_t res = *ptep;
 365
 366         /* Pure native function needs no input for mm, addr */
 367         native_pte_clear(NULL, 0, ptep);
 368         return res;
 369 }
 370
 371 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 372                                      pte_t *ptep , pte_t pte)
 373 {
 374         native_set_pte(ptep, pte);
 375 }
 376
 377 #ifndef CONFIG_PARAVIRT
 378 /*
 379  * Rules for using pte_update - it must be called after any PTE update which
 380  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 381  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 382  * updates should either be sets, clears, or set_pte_atomic for P->P
 383  * transitions, which means this hook should only be called for user PTEs.
 384  * This hook implies a P->P protection or access change has taken place, which
 385  * requires a subsequent TLB flush.  The notification can optionally be delayed
 386  * until the TLB flush event by using the pte_update_defer form of the
 387  * interface, but care must be taken to assure that the flush happens while
 388  * still holding the same page table lock so that the shadow and primary pages
 389  * do not become out of sync on SMP.
 390  */
 391 #define pte_update(mm, addr, ptep)              do { } while (0)
 392 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 393 #endif
 394
 395 /*
 396  * We only update the dirty/accessed state if we set
 397  * the dirty bit by hand in the kernel, since the hardware
 398  * will do the accessed bit for us, and we don't want to
 399  * race with other CPU's that might be updating the dirty
 400  * bit at the same time.
 401  */
 402 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 403 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 404                                  unsigned long address, pte_t *ptep,
 405                                  pte_t entry, int dirty);
 406
 407 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 408 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 409                                      unsigned long addr, pte_t *ptep);
 410
 411 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 412 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 413                                   unsigned long address, pte_t *ptep);
 414
 415 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 416 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 417                                        pte_t *ptep)
 418 {
 419         pte_t pte = native_ptep_get_and_clear(ptep);
 420         pte_update(mm, addr, ptep);
 421         return pte;
 422 }
 423
 424 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 425 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 426                                             unsigned long addr, pte_t *ptep,
 427                                             int full)
 428 {
 429         pte_t pte;
 430         if (full) {
 431                 /*
 432                  * Full address destruction in progress; paravirt does not
 433                  * care about updates and native needs no locking
 434                  */
 435                 pte = native_local_ptep_get_and_clear(ptep);
 436         } else {
 437                 pte = ptep_get_and_clear(mm, addr, ptep);
 438         }
 439         return pte;
 440 }
 441
 442 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 443 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 444                                       unsigned long addr, pte_t *ptep)
 445 {
 446         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 447         pte_update(mm, addr, ptep);
 448 }
 449
 450 /*
 451  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 452  *
 453  *  dst - pointer to pgd range anwhere on a pgd page
 454  *  src - ""
 455  *  count - the number of pgds to copy.
 456  *
 457  * dst and src can be on the same page, but the range must not overlap,
 458  * and must not cross a page boundary.
 459  */
 460 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 461 {
 462        memcpy(dst, src, count * sizeof(pgd_t));
 463 }
 464
 465
 466 #include <asm-generic/pgtable.h>
 467 #endif  /* __ASSEMBLY__ */
 468
 469 #endif  /* _ASM_X86_PGTABLE_H */