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#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
 212typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 213
 214typedef struct { pgdval_t pgd; } pgd_t;
 215
 216static inline pgd_t native_make_pgd(pgdval_t val)
 217{
 218        return (pgd_t) { val };
 219}
 220
 221static inline pgdval_t native_pgd_val(pgd_t pgd)
 222{
 223        return pgd.pgd;
 224}
 225
 226static 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
 232typedef struct { pudval_t pud; } pud_t;
 233
 234static inline pud_t native_make_pud(pmdval_t val)
 235{
 236        return (pud_t) { val };
 237}
 238
 239static 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
 246static 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
 253typedef struct { pmdval_t pmd; } pmd_t;
 254
 255static inline pmd_t native_make_pmd(pmdval_t val)
 256{
 257        return (pmd_t) { val };
 258}
 259
 260static 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
 267static inline pmdval_t native_pmd_val(pmd_t pmd)
 268{
 269        return native_pgd_val(pmd.pud.pgd);
 270}
 271#endif
 272
 273static inline pudval_t pud_flags(pud_t pud)
 274{
 275        return native_pud_val(pud) & PTE_FLAGS_MASK;
 276}
 277
 278static inline pmdval_t pmd_flags(pmd_t pmd)
 279{
 280        return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 281}
 282
 283static inline pte_t native_make_pte(pteval_t val)
 284{
 285        return (pte_t) { .pte = val };
 286}
 287
 288static inline pteval_t native_pte_val(pte_t pte)
 289{
 290        return pte.pte;
 291}
 292
 293static 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
 302typedef struct page *pgtable_t;
 303
 304extern pteval_t __supported_pte_mask;
 305extern void set_nx(void);
 306extern int nx_enabled;
 307
 308#define pgprot_writecombine     pgprot_writecombine
 309extern 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
 315struct file;
 316pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 317                              unsigned long size, pgprot_t vma_prot);
 318int 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. */
 322void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 323
 324extern void native_pagetable_reserve(u64 start, u64 end);
 325#ifdef CONFIG_X86_32
 326extern void native_pagetable_init(void);
 327#else
 328#define native_pagetable_init        paging_init
 329#endif
 330
 331struct seq_file;
 332extern void arch_report_meminfo(struct seq_file *m);
 333
 334enum {
 335        PG_LEVEL_NONE,
 336        PG_LEVEL_4K,
 337        PG_LEVEL_2M,
 338        PG_LEVEL_1G,
 339        PG_LEVEL_NUM
 340};
 341
 342#ifdef CONFIG_PROC_FS
 343extern void update_page_count(int level, unsigned long pages);
 344#else
 345static inline void update_page_count(int level, unsigned long pages) { }
 346#endif
 347
 348/*
 349 * Helper function that returns the kernel pagetable entry controlling
 350 * the virtual address 'address'. NULL means no pagetable entry present.
 351 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 352 * as a pte too.
 353 */
 354extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 355
 356#endif  /* !__ASSEMBLY__ */
 357
 358#endif /* _ASM_X86_PGTABLE_DEFS_H */
 359