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_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_SPLITTING     _PAGE_BIT_SOFTW2 /* only valid on a PSE pmd */
  26 #define _PAGE_BIT_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
  27 #define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  28 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
  29
  30 /*
  31  * Swap offsets on configurations that allow automatic NUMA balancing use the
  32  * bits after _PAGE_BIT_GLOBAL. To uniquely distinguish NUMA hinting PTEs from
  33  * swap entries, we use the first bit after _PAGE_BIT_GLOBAL and shrink the
  34  * maximum possible swap space from 16TB to 8TB.
  35  */
  36 #define _PAGE_BIT_NUMA          (_PAGE_BIT_GLOBAL+1)
  37
  38 /* If _PAGE_BIT_PRESENT is clear, we use these: */
  39 /* - if the user mapped it with PROT_NONE; pte_present gives true */
  40 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  41 /* - set: nonlinear file mapping, saved PTE; unset:swap */
  42 #define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY
  43
  44 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  45 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  46 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  47 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  48 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  49 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  50 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  51 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  52 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  53 #define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  54 #define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  55 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  56 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  57 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  58 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  59 #define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
  60 #define __HAVE_ARCH_PTE_SPECIAL
  61
  62 #ifdef CONFIG_KMEMCHECK
  63 #define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  64 #else
  65 #define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  66 #endif
  67
  68 /*
  69  * The same hidden bit is used by kmemcheck, but since kmemcheck
  70  * works on kernel pages while soft-dirty engine on user space,
  71  * they do not conflict with each other.
  72  */
  73
  74 #ifdef CONFIG_MEM_SOFT_DIRTY
  75 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  76 #else
  77 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  78 #endif
  79
  80 /*
  81  * _PAGE_NUMA distinguishes between a numa hinting minor fault and a page
  82  * that is not present. The hinting fault gathers numa placement statistics
  83  * (see pte_numa()). The bit is always zero when the PTE is not present.
  84  *
  85  * The bit picked must be always zero when the pmd is present and not
  86  * present, so that we don't lose information when we set it while
  87  * atomically clearing the present bit.
  88  */
  89 #ifdef CONFIG_NUMA_BALANCING
  90 #define _PAGE_NUMA      (_AT(pteval_t, 1) << _PAGE_BIT_NUMA)
  91 #else
  92 #define _PAGE_NUMA      (_AT(pteval_t, 0))
  93 #endif
  94
  95 /*
  96  * Tracking soft dirty bit when a page goes to a swap is tricky.
  97  * We need a bit which can be stored in pte _and_ not conflict
  98  * with swap entry format. On x86 bits 6 and 7 are *not* involved
  99  * into swap entry computation, but bit 6 is used for nonlinear
 100  * file mapping, so we borrow bit 7 for soft dirty tracking.
 101  *
 102  * Please note that this bit must be treated as swap dirty page
 103  * mark if and only if the PTE has present bit clear!
 104  */
 105 #ifdef CONFIG_MEM_SOFT_DIRTY
 106 #define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
 107 #else
 108 #define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
 109 #endif
 110
 111 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 112 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
 113 #else
 114 #define _PAGE_NX        (_AT(pteval_t, 0))
 115 #endif
 116
 117 #define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
 118 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
 119
 120 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
 121                          _PAGE_ACCESSED | _PAGE_DIRTY)
 122 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 123                          _PAGE_DIRTY)
 124
 125 /* Set of bits not changed in pte_modify */
 126 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 127                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 128                          _PAGE_SOFT_DIRTY | _PAGE_NUMA)
 129 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_NUMA)
 130
 131 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
 132 #define _PAGE_CACHE_WB          (0)
 133 #define _PAGE_CACHE_WC          (_PAGE_PWT)
 134 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
 135 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
 136
 137 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 138 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 139                                  _PAGE_ACCESSED | _PAGE_NX)
 140
 141 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 142                                          _PAGE_USER | _PAGE_ACCESSED)
 143 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 144                                          _PAGE_ACCESSED | _PAGE_NX)
 145 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 146                                          _PAGE_ACCESSED)
 147 #define PAGE_COPY               PAGE_COPY_NOEXEC
 148 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 149                                          _PAGE_ACCESSED | _PAGE_NX)
 150 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 151                                          _PAGE_ACCESSED)
 152
 153 #define __PAGE_KERNEL_EXEC                                              \
 154         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 155 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 156
 157 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 158 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 159 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
 160 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
 161 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 162 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 163 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 164 #define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 165 #define __PAGE_KERNEL_VVAR_NOCACHE      (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
 166 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 167 #define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 168 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 169
 170 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 171 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 172 #define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS)
 173 #define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC)
 174
 175 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 176 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 177 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 178 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 179 #define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 180 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 181 #define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 182 #define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 183 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 184 #define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 185 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 186 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 187 #define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 188 #define PAGE_KERNEL_VVAR_NOCACHE        __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
 189
 190 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 191 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 192 #define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 193 #define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 194
 195 /*         xwr */
 196 #define __P000  PAGE_NONE
 197 #define __P001  PAGE_READONLY
 198 #define __P010  PAGE_COPY
 199 #define __P011  PAGE_COPY
 200 #define __P100  PAGE_READONLY_EXEC
 201 #define __P101  PAGE_READONLY_EXEC
 202 #define __P110  PAGE_COPY_EXEC
 203 #define __P111  PAGE_COPY_EXEC
 204
 205 #define __S000  PAGE_NONE
 206 #define __S001  PAGE_READONLY
 207 #define __S010  PAGE_SHARED
 208 #define __S011  PAGE_SHARED
 209 #define __S100  PAGE_READONLY_EXEC
 210 #define __S101  PAGE_READONLY_EXEC
 211 #define __S110  PAGE_SHARED_EXEC
 212 #define __S111  PAGE_SHARED_EXEC
 213
 214 /*
 215  * early identity mapping  pte attrib macros.
 216  */
 217 #ifdef CONFIG_X86_64
 218 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 219 #else
 220 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 221 #define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 222 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 223 #endif
 224
 225 #ifdef CONFIG_X86_32
 226 # include <asm/pgtable_32_types.h>
 227 #else
 228 # include <asm/pgtable_64_types.h>
 229 #endif
 230
 231 #ifndef __ASSEMBLY__
 232
 233 #include <linux/types.h>
 234
 235 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
 236 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 237
 238 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
 239 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 240
 241 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 242
 243 typedef struct { pgdval_t pgd; } pgd_t;
 244
 245 static inline pgd_t native_make_pgd(pgdval_t val)
 246 {
 247         return (pgd_t) { val };
 248 }
 249
 250 static inline pgdval_t native_pgd_val(pgd_t pgd)
 251 {
 252         return pgd.pgd;
 253 }
 254
 255 static inline pgdval_t pgd_flags(pgd_t pgd)
 256 {
 257         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 258 }
 259
 260 #if PAGETABLE_LEVELS > 3
 261 typedef struct { pudval_t pud; } pud_t;
 262
 263 static inline pud_t native_make_pud(pmdval_t val)
 264 {
 265         return (pud_t) { val };
 266 }
 267
 268 static inline pudval_t native_pud_val(pud_t pud)
 269 {
 270         return pud.pud;
 271 }
 272 #else
 273 #include <asm-generic/pgtable-nopud.h>
 274
 275 static inline pudval_t native_pud_val(pud_t pud)
 276 {
 277         return native_pgd_val(pud.pgd);
 278 }
 279 #endif
 280
 281 #if PAGETABLE_LEVELS > 2
 282 typedef struct { pmdval_t pmd; } pmd_t;
 283
 284 static inline pmd_t native_make_pmd(pmdval_t val)
 285 {
 286         return (pmd_t) { val };
 287 }
 288
 289 static inline pmdval_t native_pmd_val(pmd_t pmd)
 290 {
 291         return pmd.pmd;
 292 }
 293 #else
 294 #include <asm-generic/pgtable-nopmd.h>
 295
 296 static inline pmdval_t native_pmd_val(pmd_t pmd)
 297 {
 298         return native_pgd_val(pmd.pud.pgd);
 299 }
 300 #endif
 301
 302 static inline pudval_t pud_flags(pud_t pud)
 303 {
 304         return native_pud_val(pud) & PTE_FLAGS_MASK;
 305 }
 306
 307 static inline pmdval_t pmd_flags(pmd_t pmd)
 308 {
 309         return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 310 }
 311
 312 static inline pte_t native_make_pte(pteval_t val)
 313 {
 314         return (pte_t) { .pte = val };
 315 }
 316
 317 static inline pteval_t native_pte_val(pte_t pte)
 318 {
 319         return pte.pte;
 320 }
 321
 322 static inline pteval_t pte_flags(pte_t pte)
 323 {
 324         return native_pte_val(pte) & PTE_FLAGS_MASK;
 325 }
 326
 327 #define pgprot_val(x)   ((x).pgprot)
 328 #define __pgprot(x)     ((pgprot_t) { (x) } )
 329
 330
 331 typedef struct page *pgtable_t;
 332
 333 extern pteval_t __supported_pte_mask;
 334 extern void set_nx(void);
 335 extern int nx_enabled;
 336
 337 #define pgprot_writecombine     pgprot_writecombine
 338 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 339
 340 /* Indicate that x86 has its own track and untrack pfn vma functions */
 341 #define __HAVE_PFNMAP_TRACKING
 342
 343 #define __HAVE_PHYS_MEM_ACCESS_PROT
 344 struct file;
 345 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 346                               unsigned long size, pgprot_t vma_prot);
 347 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 348                               unsigned long size, pgprot_t *vma_prot);
 349
 350 /* Install a pte for a particular vaddr in kernel space. */
 351 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 352
 353 #ifdef CONFIG_X86_32
 354 extern void native_pagetable_init(void);
 355 #else
 356 #define native_pagetable_init        paging_init
 357 #endif
 358
 359 struct seq_file;
 360 extern void arch_report_meminfo(struct seq_file *m);
 361
 362 enum pg_level {
 363         PG_LEVEL_NONE,
 364         PG_LEVEL_4K,
 365         PG_LEVEL_2M,
 366         PG_LEVEL_1G,
 367         PG_LEVEL_NUM
 368 };
 369
 370 #ifdef CONFIG_PROC_FS
 371 extern void update_page_count(int level, unsigned long pages);
 372 #else
 373 static inline void update_page_count(int level, unsigned long pages) { }
 374 #endif
 375
 376 /*
 377  * Helper function that returns the kernel pagetable entry controlling
 378  * the virtual address 'address'. NULL means no pagetable entry present.
 379  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 380  * as a pte too.
 381  */
 382 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 383 extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 384                                     unsigned int *level);
 385 extern phys_addr_t slow_virt_to_phys(void *__address);
 386 extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 387                                    unsigned numpages, unsigned long page_flags);
 388 void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
 389                                unsigned numpages);
 390 #endif  /* !__ASSEMBLY__ */
 391
 392 #endif /* _ASM_X86_PGTABLE_DEFS_H */