LXR linux/arch/x86/include/asm/pgtable

   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
 239typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 240
 241typedef struct { pgdval_t pgd; } pgd_t;
 242
 243static inline pgd_t native_make_pgd(pgdval_t val)
 244{
 245        return (pgd_t) { val };
 246}
 247
 248static inline pgdval_t native_pgd_val(pgd_t pgd)
 249{
 250        return pgd.pgd;
 251}
 252
 253static 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
 259typedef struct { pudval_t pud; } pud_t;
 260
 261static inline pud_t native_make_pud(pmdval_t val)
 262{
 263        return (pud_t) { val };
 264}
 265
 266static 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
 273static 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
 280typedef struct { pmdval_t pmd; } pmd_t;
 281
 282static inline pmd_t native_make_pmd(pmdval_t val)
 283{
 284        return (pmd_t) { val };
 285}
 286
 287static 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
 294static inline pmdval_t native_pmd_val(pmd_t pmd)
 295{
 296        return native_pgd_val(pmd.pud.pgd);
 297}
 298#endif
 299
 300static inline pudval_t pud_flags(pud_t pud)
 301{
 302        return native_pud_val(pud) & PTE_FLAGS_MASK;
 303}
 304
 305static inline pmdval_t pmd_flags(pmd_t pmd)
 306{
 307        return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 308}
 309
 310static inline pte_t native_make_pte(pteval_t val)
 311{
 312        return (pte_t) { .pte = val };
 313}
 314
 315static inline pteval_t native_pte_val(pte_t pte)
 316{
 317        return pte.pte;
 318}
 319
 320static 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
 329typedef struct page *pgtable_t;
 330
 331extern pteval_t __supported_pte_mask;
 332extern void set_nx(void);
 333extern int nx_enabled;
 334
 335#define pgprot_writecombine     pgprot_writecombine
 336extern 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
 342struct file;
 343pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 344                              unsigned long size, pgprot_t vma_prot);
 345int 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. */
 349void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 350
 351#ifdef CONFIG_X86_32
 352extern void native_pagetable_init(void);
 353#else
 354#define native_pagetable_init        paging_init
 355#endif
 356
 357struct seq_file;
 358extern void arch_report_meminfo(struct seq_file *m);
 359
 360enum 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
 369extern void update_page_count(int level, unsigned long pages);
 370#else
 371static 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 */
 380extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 381extern phys_addr_t slow_virt_to_phys(void *__address);
 382
 383#endif  /* !__ASSEMBLY__ */
 384
 385#endif /* _ASM_X86_PGTABLE_DEFS_H */
 386