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