arch/x86/include/asm/pgtable_types.h

   1 #ifndef _ASM_X86_PGTABLE_DEFS_H
   2 #define _ASM_X86_PGTABLE_DEFS_H
   3
   4 #include <linux/const.h>
   5 #include <asm/page_types.h>
   6
   7 #define FIRST_USER_ADDRESS      0UL
   8
   9 #define _PAGE_BIT_PRESENT       0       /* is present */
  10 #define _PAGE_BIT_RW            1       /* writeable */
  11 #define _PAGE_BIT_USER          2       /* userspace addressable */
  12 #define _PAGE_BIT_PWT           3       /* page write through */
  13 #define _PAGE_BIT_PCD           4       /* page cache disabled */
  14 #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  15 #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  16 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  17 #define _PAGE_BIT_PAT           7       /* on 4KB pages */
  18 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  19 #define _PAGE_BIT_SOFTW1        9       /* available for programmer */
  20 #define _PAGE_BIT_SOFTW2        10      /* " */
  21 #define _PAGE_BIT_SOFTW3        11      /* " */
  22 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  23 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_SOFTW1
  24 #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_SOFTW1
  25 #define _PAGE_BIT_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
  26 #define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  27 #define _PAGE_BIT_SOFTW4        58      /* available for programmer */
  28 #define _PAGE_BIT_DEVMAP                _PAGE_BIT_SOFTW4
  29 #define _PAGE_BIT_NX            63      /* No execute: only valid after cpuid check */
  30
  31 /* If _PAGE_BIT_PRESENT is clear, we use these: */
  32 /* - if the user mapped it with PROT_NONE; pte_present gives true */
  33 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  34
  35 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  36 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  37 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  38 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  39 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  40 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  41 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  42 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  43 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  44 #define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  45 #define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  46 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  47 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  48 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  49 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  50 #define __HAVE_ARCH_PTE_SPECIAL
  51
  52 #ifdef CONFIG_KMEMCHECK
  53 #define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  54 #else
  55 #define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  56 #endif
  57
  58 /*
  59  * The same hidden bit is used by kmemcheck, but since kmemcheck
  60  * works on kernel pages while soft-dirty engine on user space,
  61  * they do not conflict with each other.
  62  */
  63
  64 #ifdef CONFIG_MEM_SOFT_DIRTY
  65 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  66 #else
  67 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  68 #endif
  69
  70 /*
  71  * Tracking soft dirty bit when a page goes to a swap is tricky.
  72  * We need a bit which can be stored in pte _and_ not conflict
  73  * with swap entry format. On x86 bits 6 and 7 are *not* involved
  74  * into swap entry computation, but bit 6 is used for nonlinear
  75  * file mapping, so we borrow bit 7 for soft dirty tracking.
  76  *
  77  * Please note that this bit must be treated as swap dirty page
  78  * mark if and only if the PTE has present bit clear!
  79  */
  80 #ifdef CONFIG_MEM_SOFT_DIRTY
  81 #define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
  82 #else
  83 #define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
  84 #endif
  85
  86 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  87 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  88 #define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
  89 #define __HAVE_ARCH_PTE_DEVMAP
  90 #else
  91 #define _PAGE_NX        (_AT(pteval_t, 0))
  92 #define _PAGE_DEVMAP    (_AT(pteval_t, 0))
  93 #endif
  94
  95 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  96
  97 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  98                          _PAGE_ACCESSED | _PAGE_DIRTY)
  99 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 100                          _PAGE_DIRTY)
 101
 102 /* Set of bits not changed in pte_modify */
 103 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 104                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 105                          _PAGE_SOFT_DIRTY)
 106 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 107
 108 /*
 109  * The cache modes defined here are used to translate between pure SW usage
 110  * and the HW defined cache mode bits and/or PAT entries.
 111  *
 112  * The resulting bits for PWT, PCD and PAT should be chosen in a way
 113  * to have the WB mode at index 0 (all bits clear). This is the default
 114  * right now and likely would break too much if changed.
 115  */
 116 #ifndef __ASSEMBLY__
 117 enum page_cache_mode {
 118         _PAGE_CACHE_MODE_WB = 0,
 119         _PAGE_CACHE_MODE_WC = 1,
 120         _PAGE_CACHE_MODE_UC_MINUS = 2,
 121         _PAGE_CACHE_MODE_UC = 3,
 122         _PAGE_CACHE_MODE_WT = 4,
 123         _PAGE_CACHE_MODE_WP = 5,
 124         _PAGE_CACHE_MODE_NUM = 8
 125 };
 126 #endif
 127
 128 #define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 129 #define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
 130
 131 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 132 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 133                                  _PAGE_ACCESSED | _PAGE_NX)
 134
 135 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 136                                          _PAGE_USER | _PAGE_ACCESSED)
 137 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 138                                          _PAGE_ACCESSED | _PAGE_NX)
 139 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 140                                          _PAGE_ACCESSED)
 141 #define PAGE_COPY               PAGE_COPY_NOEXEC
 142 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 143                                          _PAGE_ACCESSED | _PAGE_NX)
 144 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 145                                          _PAGE_ACCESSED)
 146
 147 #define __PAGE_KERNEL_EXEC                                              \
 148         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 149 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 150
 151 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 152 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 153 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
 154 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 155 #define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 156 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 157 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 158
 159 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 160 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 161
 162 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 163 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 164 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 165 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 166 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 167 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 168 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 169 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 170 #define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 171
 172 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 173 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 174
 175 /*         xwr */
 176 #define __P000  PAGE_NONE
 177 #define __P001  PAGE_READONLY
 178 #define __P010  PAGE_COPY
 179 #define __P011  PAGE_COPY
 180 #define __P100  PAGE_READONLY_EXEC
 181 #define __P101  PAGE_READONLY_EXEC
 182 #define __P110  PAGE_COPY_EXEC
 183 #define __P111  PAGE_COPY_EXEC
 184
 185 #define __S000  PAGE_NONE
 186 #define __S001  PAGE_READONLY
 187 #define __S010  PAGE_SHARED
 188 #define __S011  PAGE_SHARED
 189 #define __S100  PAGE_READONLY_EXEC
 190 #define __S101  PAGE_READONLY_EXEC
 191 #define __S110  PAGE_SHARED_EXEC
 192 #define __S111  PAGE_SHARED_EXEC
 193
 194 /*
 195  * early identity mapping  pte attrib macros.
 196  */
 197 #ifdef CONFIG_X86_64
 198 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 199 #else
 200 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 201 #define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 202 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 203 #endif
 204
 205 #ifdef CONFIG_X86_32
 206 # include <asm/pgtable_32_types.h>
 207 #else
 208 # include <asm/pgtable_64_types.h>
 209 #endif
 210
 211 #ifndef __ASSEMBLY__
 212
 213 #include <linux/types.h>
 214
 215 /* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 216 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 217
 218 /* Extracts the flags from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 219 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 220
 221 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 222
 223 typedef struct { pgdval_t pgd; } pgd_t;
 224
 225 static inline pgd_t native_make_pgd(pgdval_t val)
 226 {
 227         return (pgd_t) { val };
 228 }
 229
 230 static inline pgdval_t native_pgd_val(pgd_t pgd)
 231 {
 232         return pgd.pgd;
 233 }
 234
 235 static inline pgdval_t pgd_flags(pgd_t pgd)
 236 {
 237         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 238 }
 239
 240 #if CONFIG_PGTABLE_LEVELS > 3
 241 typedef struct { pudval_t pud; } pud_t;
 242
 243 static inline pud_t native_make_pud(pmdval_t val)
 244 {
 245         return (pud_t) { val };
 246 }
 247
 248 static inline pudval_t native_pud_val(pud_t pud)
 249 {
 250         return pud.pud;
 251 }
 252 #else
 253 #include <asm-generic/pgtable-nopud.h>
 254
 255 static inline pudval_t native_pud_val(pud_t pud)
 256 {
 257         return native_pgd_val(pud.pgd);
 258 }
 259 #endif
 260
 261 #if CONFIG_PGTABLE_LEVELS > 2
 262 typedef struct { pmdval_t pmd; } pmd_t;
 263
 264 static inline pmd_t native_make_pmd(pmdval_t val)
 265 {
 266         return (pmd_t) { val };
 267 }
 268
 269 static inline pmdval_t native_pmd_val(pmd_t pmd)
 270 {
 271         return pmd.pmd;
 272 }
 273 #else
 274 #include <asm-generic/pgtable-nopmd.h>
 275
 276 static inline pmdval_t native_pmd_val(pmd_t pmd)
 277 {
 278         return native_pgd_val(pmd.pud.pgd);
 279 }
 280 #endif
 281
 282 static inline pudval_t pud_pfn_mask(pud_t pud)
 283 {
 284         if (native_pud_val(pud) & _PAGE_PSE)
 285                 return PHYSICAL_PUD_PAGE_MASK;
 286         else
 287                 return PTE_PFN_MASK;
 288 }
 289
 290 static inline pudval_t pud_flags_mask(pud_t pud)
 291 {
 292         return ~pud_pfn_mask(pud);
 293 }
 294
 295 static inline pudval_t pud_flags(pud_t pud)
 296 {
 297         return native_pud_val(pud) & pud_flags_mask(pud);
 298 }
 299
 300 static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
 301 {
 302         if (native_pmd_val(pmd) & _PAGE_PSE)
 303                 return PHYSICAL_PMD_PAGE_MASK;
 304         else
 305                 return PTE_PFN_MASK;
 306 }
 307
 308 static inline pmdval_t pmd_flags_mask(pmd_t pmd)
 309 {
 310         return ~pmd_pfn_mask(pmd);
 311 }
 312
 313 static inline pmdval_t pmd_flags(pmd_t pmd)
 314 {
 315         return native_pmd_val(pmd) & pmd_flags_mask(pmd);
 316 }
 317
 318 static inline pte_t native_make_pte(pteval_t val)
 319 {
 320         return (pte_t) { .pte = val };
 321 }
 322
 323 static inline pteval_t native_pte_val(pte_t pte)
 324 {
 325         return pte.pte;
 326 }
 327
 328 static inline pteval_t pte_flags(pte_t pte)
 329 {
 330         return native_pte_val(pte) & PTE_FLAGS_MASK;
 331 }
 332
 333 #define pgprot_val(x)   ((x).pgprot)
 334 #define __pgprot(x)     ((pgprot_t) { (x) } )
 335
 336 extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
 337 extern uint8_t __pte2cachemode_tbl[8];
 338
 339 #define __pte2cm_idx(cb)                                \
 340         ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
 341          (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
 342          (((cb) >> _PAGE_BIT_PWT) & 1))
 343 #define __cm_idx2pte(i)                                 \
 344         ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
 345          (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
 346          (((i) & 1) << _PAGE_BIT_PWT))
 347
 348 static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
 349 {
 350         if (likely(pcm == 0))
 351                 return 0;
 352         return __cachemode2pte_tbl[pcm];
 353 }
 354 static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 355 {
 356         return __pgprot(cachemode2protval(pcm));
 357 }
 358 static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
 359 {
 360         unsigned long masked;
 361
 362         masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
 363         if (likely(masked == 0))
 364                 return 0;
 365         return __pte2cachemode_tbl[__pte2cm_idx(masked)];
 366 }
 367 static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 368 {
 369         pgprot_t new;
 370         unsigned long val;
 371
 372         val = pgprot_val(pgprot);
 373         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 374                 ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 375         return new;
 376 }
 377 static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 378 {
 379         pgprot_t new;
 380         unsigned long val;
 381
 382         val = pgprot_val(pgprot);
 383         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 384                           ((val & _PAGE_PAT_LARGE) >>
 385                            (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 386         return new;
 387 }
 388
 389
 390 typedef struct page *pgtable_t;
 391
 392 extern pteval_t __supported_pte_mask;
 393 extern void set_nx(void);
 394 extern int nx_enabled;
 395
 396 #define pgprot_writecombine     pgprot_writecombine
 397 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 398
 399 #define pgprot_writethrough     pgprot_writethrough
 400 extern pgprot_t pgprot_writethrough(pgprot_t prot);
 401
 402 /* Indicate that x86 has its own track and untrack pfn vma functions */
 403 #define __HAVE_PFNMAP_TRACKING
 404
 405 #define __HAVE_PHYS_MEM_ACCESS_PROT
 406 struct file;
 407 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 408                               unsigned long size, pgprot_t vma_prot);
 409 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 410                               unsigned long size, pgprot_t *vma_prot);
 411
 412 /* Install a pte for a particular vaddr in kernel space. */
 413 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 414
 415 #ifdef CONFIG_X86_32
 416 extern void native_pagetable_init(void);
 417 #else
 418 #define native_pagetable_init        paging_init
 419 #endif
 420
 421 struct seq_file;
 422 extern void arch_report_meminfo(struct seq_file *m);
 423
 424 enum pg_level {
 425         PG_LEVEL_NONE,
 426         PG_LEVEL_4K,
 427         PG_LEVEL_2M,
 428         PG_LEVEL_1G,
 429         PG_LEVEL_NUM
 430 };
 431
 432 #ifdef CONFIG_PROC_FS
 433 extern void update_page_count(int level, unsigned long pages);
 434 #else
 435 static inline void update_page_count(int level, unsigned long pages) { }
 436 #endif
 437
 438 /*
 439  * Helper function that returns the kernel pagetable entry controlling
 440  * the virtual address 'address'. NULL means no pagetable entry present.
 441  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 442  * as a pte too.
 443  */
 444 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 445 extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 446                                     unsigned int *level);
 447 extern pmd_t *lookup_pmd_address(unsigned long address);
 448 extern phys_addr_t slow_virt_to_phys(void *__address);
 449 extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 450                                    unsigned numpages, unsigned long page_flags);
 451 void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
 452                                unsigned numpages);
 453 #endif  /* !__ASSEMBLY__ */
 454
 455 #endif /* _ASM_X86_PGTABLE_DEFS_H */