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      0
   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_UNUSED1       9       /* available for programmer */
  20 #define _PAGE_BIT_IOMAP         10      /* flag used to indicate IO mapping */
  21 #define _PAGE_BIT_HIDDEN        11      /* hidden by kmemcheck */
  22 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  23 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_UNUSED1
  24 #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_UNUSED1
  25 #define _PAGE_BIT_SPLITTING     _PAGE_BIT_UNUSED1 /* only valid on a PSE pmd */
  26 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
  27
  28 /* If _PAGE_BIT_PRESENT is clear, we use these: */
  29 /* - if the user mapped it with PROT_NONE; pte_present gives true */
  30 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  31 /* - set: nonlinear file mapping, saved PTE; unset:swap */
  32 #define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY
  33
  34 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  35 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  36 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  37 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  38 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  39 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  40 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  41 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  42 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  43 #define _PAGE_UNUSED1   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
  44 #define _PAGE_IOMAP     (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
  45 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  46 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  47 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  48 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  49 #define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
  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 #define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_HIDDEN
  65
  66 #ifdef CONFIG_MEM_SOFT_DIRTY
  67 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  68 #else
  69 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  70 #endif
  71
  72 /*
  73  * Tracking soft dirty bit when a page goes to a swap is tricky.
  74  * We need a bit which can be stored in pte _and_ not conflict
  75  * with swap entry format. On x86 bits 6 and 7 are *not* involved
  76  * into swap entry computation, but bit 6 is used for nonlinear
  77  * file mapping, so we borrow bit 7 for soft dirty tracking.
  78  */
  79 #ifdef CONFIG_MEM_SOFT_DIRTY
  80 #define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
  81 #else
  82 #define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
  83 #endif
  84
  85 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  86 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  87 #else
  88 #define _PAGE_NX        (_AT(pteval_t, 0))
  89 #endif
  90
  91 #define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
  92 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  93
  94 /*
  95  * _PAGE_NUMA indicates that this page will trigger a numa hinting
  96  * minor page fault to gather numa placement statistics (see
  97  * pte_numa()). The bit picked (8) is within the range between
  98  * _PAGE_FILE (6) and _PAGE_PROTNONE (8) bits. Therefore, it doesn't
  99  * require changes to the swp entry format because that bit is always
 100  * zero when the pte is not present.
 101  *
 102  * The bit picked must be always zero when the pmd is present and not
 103  * present, so that we don't lose information when we set it while
 104  * atomically clearing the present bit.
 105  *
 106  * Because we shared the same bit (8) with _PAGE_PROTNONE this can be
 107  * interpreted as _PAGE_NUMA only in places that _PAGE_PROTNONE
 108  * couldn't reach, like handle_mm_fault() (see access_error in
 109  * arch/x86/mm/fault.c, the vma protection must not be PROT_NONE for
 110  * handle_mm_fault() to be invoked).
 111  */
 112 #define _PAGE_NUMA      _PAGE_PROTNONE
 113
 114 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
 115                          _PAGE_ACCESSED | _PAGE_DIRTY)
 116 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 117                          _PAGE_DIRTY)
 118
 119 /* Set of bits not changed in pte_modify */
 120 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 121                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
 122 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 123
 124 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
 125 #define _PAGE_CACHE_WB          (0)
 126 #define _PAGE_CACHE_WC          (_PAGE_PWT)
 127 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
 128 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
 129
 130 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 131 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 132                                  _PAGE_ACCESSED | _PAGE_NX)
 133
 134 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 135                                          _PAGE_USER | _PAGE_ACCESSED)
 136 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 137                                          _PAGE_ACCESSED | _PAGE_NX)
 138 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 139                                          _PAGE_ACCESSED)
 140 #define PAGE_COPY               PAGE_COPY_NOEXEC
 141 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 142                                          _PAGE_ACCESSED | _PAGE_NX)
 143 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 144                                          _PAGE_ACCESSED)
 145
 146 #define __PAGE_KERNEL_EXEC                                              \
 147         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 148 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 149
 150 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 151 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 152 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
 153 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
 154 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 155 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 156 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 157 #define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 158 #define __PAGE_KERNEL_VVAR_NOCACHE      (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
 159 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 160 #define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 161 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 162
 163 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
 164 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
 165 #define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
 166 #define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
 167
 168 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 169 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 170 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 171 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 172 #define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 173 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 174 #define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 175 #define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 176 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 177 #define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 178 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 179 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 180 #define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 181 #define PAGE_KERNEL_VVAR_NOCACHE        __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
 182
 183 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 184 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 185 #define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 186 #define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 187
 188 /*         xwr */
 189 #define __P000  PAGE_NONE
 190 #define __P001  PAGE_READONLY
 191 #define __P010  PAGE_COPY
 192 #define __P011  PAGE_COPY
 193 #define __P100  PAGE_READONLY_EXEC
 194 #define __P101  PAGE_READONLY_EXEC
 195 #define __P110  PAGE_COPY_EXEC
 196 #define __P111  PAGE_COPY_EXEC
 197
 198 #define __S000  PAGE_NONE
 199 #define __S001  PAGE_READONLY
 200 #define __S010  PAGE_SHARED
 201 #define __S011  PAGE_SHARED
 202 #define __S100  PAGE_READONLY_EXEC
 203 #define __S101  PAGE_READONLY_EXEC
 204 #define __S110  PAGE_SHARED_EXEC
 205 #define __S111  PAGE_SHARED_EXEC
 206
 207 /*
 208  * early identity mapping  pte attrib macros.
 209  */
 210 #ifdef CONFIG_X86_64
 211 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 212 #else
 213 /*
 214  * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
 215  * bits are combined, this will alow user to access the high address mapped
 216  * VDSO in the presence of CONFIG_COMPAT_VDSO
 217  */
 218 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 219 #define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
 220 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 221 #endif
 222
 223 #ifdef CONFIG_X86_32
 224 # include <asm/pgtable_32_types.h>
 225 #else
 226 # include <asm/pgtable_64_types.h>
 227 #endif
 228
 229 #ifndef __ASSEMBLY__
 230
 231 #include <linux/types.h>
 232
 233 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
 234 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 235
 236 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
 237 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 238
 239 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 240
 241 typedef struct { pgdval_t pgd; } pgd_t;
 242
 243 static inline pgd_t native_make_pgd(pgdval_t val)
 244 {
 245         return (pgd_t) { val };
 246 }
 247
 248 static inline pgdval_t native_pgd_val(pgd_t pgd)
 249 {
 250         return pgd.pgd;
 251 }
 252
 253 static inline pgdval_t pgd_flags(pgd_t pgd)
 254 {
 255         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 256 }
 257
 258 #if PAGETABLE_LEVELS > 3
 259 typedef struct { pudval_t pud; } pud_t;
 260
 261 static inline pud_t native_make_pud(pmdval_t val)
 262 {
 263         return (pud_t) { val };
 264 }
 265
 266 static inline pudval_t native_pud_val(pud_t pud)
 267 {
 268         return pud.pud;
 269 }
 270 #else
 271 #include <asm-generic/pgtable-nopud.h>
 272
 273 static inline pudval_t native_pud_val(pud_t pud)
 274 {
 275         return native_pgd_val(pud.pgd);
 276 }
 277 #endif
 278
 279 #if PAGETABLE_LEVELS > 2
 280 typedef struct { pmdval_t pmd; } pmd_t;
 281
 282 static inline pmd_t native_make_pmd(pmdval_t val)
 283 {
 284         return (pmd_t) { val };
 285 }
 286
 287 static inline pmdval_t native_pmd_val(pmd_t pmd)
 288 {
 289         return pmd.pmd;
 290 }
 291 #else
 292 #include <asm-generic/pgtable-nopmd.h>
 293
 294 static inline pmdval_t native_pmd_val(pmd_t pmd)
 295 {
 296         return native_pgd_val(pmd.pud.pgd);
 297 }
 298 #endif
 299
 300 static inline pudval_t pud_flags(pud_t pud)
 301 {
 302         return native_pud_val(pud) & PTE_FLAGS_MASK;
 303 }
 304
 305 static inline pmdval_t pmd_flags(pmd_t pmd)
 306 {
 307         return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 308 }
 309
 310 static inline pte_t native_make_pte(pteval_t val)
 311 {
 312         return (pte_t) { .pte = val };
 313 }
 314
 315 static inline pteval_t native_pte_val(pte_t pte)
 316 {
 317         return pte.pte;
 318 }
 319
 320 static inline pteval_t pte_flags(pte_t pte)
 321 {
 322         return native_pte_val(pte) & PTE_FLAGS_MASK;
 323 }
 324
 325 #define pgprot_val(x)   ((x).pgprot)
 326 #define __pgprot(x)     ((pgprot_t) { (x) } )
 327
 328
 329 typedef struct page *pgtable_t;
 330
 331 extern pteval_t __supported_pte_mask;
 332 extern void set_nx(void);
 333 extern int nx_enabled;
 334
 335 #define pgprot_writecombine     pgprot_writecombine
 336 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 337
 338 /* Indicate that x86 has its own track and untrack pfn vma functions */
 339 #define __HAVE_PFNMAP_TRACKING
 340
 341 #define __HAVE_PHYS_MEM_ACCESS_PROT
 342 struct file;
 343 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 344                               unsigned long size, pgprot_t vma_prot);
 345 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 346                               unsigned long size, pgprot_t *vma_prot);
 347
 348 /* Install a pte for a particular vaddr in kernel space. */
 349 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 350
 351 #ifdef CONFIG_X86_32
 352 extern void native_pagetable_init(void);
 353 #else
 354 #define native_pagetable_init        paging_init
 355 #endif
 356
 357 struct seq_file;
 358 extern void arch_report_meminfo(struct seq_file *m);
 359
 360 enum pg_level {
 361         PG_LEVEL_NONE,
 362         PG_LEVEL_4K,
 363         PG_LEVEL_2M,
 364         PG_LEVEL_1G,
 365         PG_LEVEL_NUM
 366 };
 367
 368 #ifdef CONFIG_PROC_FS
 369 extern void update_page_count(int level, unsigned long pages);
 370 #else
 371 static inline void update_page_count(int level, unsigned long pages) { }
 372 #endif
 373
 374 /*
 375  * Helper function that returns the kernel pagetable entry controlling
 376  * the virtual address 'address'. NULL means no pagetable entry present.
 377  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 378  * as a pte too.
 379  */
 380 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 381 extern phys_addr_t slow_virt_to_phys(void *__address);
 382
 383 #endif  /* !__ASSEMBLY__ */
 384
 385 #endif /* _ASM_X86_PGTABLE_DEFS_H */