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