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_NX           63       /* No execute: only valid after cpuid check */
  26
  27/* If _PAGE_BIT_PRESENT is clear, we use these: */
  28/* - if the user mapped it with PROT_NONE; pte_present gives true */
  29#define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  30/* - set: nonlinear file mapping, saved PTE; unset:swap */
  31#define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY
  32
  33#define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  34#define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  35#define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  36#define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  37#define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  38#define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  39#define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  40#define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  41#define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  42#define _PAGE_UNUSED1   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
  43#define _PAGE_IOMAP     (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
  44#define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  45#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  46#define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  47#define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  48#define __HAVE_ARCH_PTE_SPECIAL
  49
  50#ifdef CONFIG_KMEMCHECK
  51#define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  52#else
  53#define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  54#endif
  55
  56#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  57#define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  58#else
  59#define _PAGE_NX        (_AT(pteval_t, 0))
  60#endif
  61
  62#define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
  63#define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  64
  65#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  66                         _PAGE_ACCESSED | _PAGE_DIRTY)
  67#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  68                         _PAGE_DIRTY)
  69
  70/* Set of bits not changed in pte_modify */
  71#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
  72                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
  73
  74#define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
  75#define _PAGE_CACHE_WB          (0)
  76#define _PAGE_CACHE_WC          (_PAGE_PWT)
  77#define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
  78#define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
  79
  80#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  81#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  82                                 _PAGE_ACCESSED | _PAGE_NX)
  83
  84#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  85                                         _PAGE_USER | _PAGE_ACCESSED)
  86#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  87                                         _PAGE_ACCESSED | _PAGE_NX)
  88#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  89                                         _PAGE_ACCESSED)
  90#define PAGE_COPY               PAGE_COPY_NOEXEC
  91#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  92                                         _PAGE_ACCESSED | _PAGE_NX)
  93#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  94                                         _PAGE_ACCESSED)
  95
  96#define __PAGE_KERNEL_EXEC                                              \
  97        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
  98#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  99
 100#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 101#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 102#define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
 103#define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
 104#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 105#define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 106#define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 107#define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
 108#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 109#define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 110#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 111
 112#define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
 113#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
 114#define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
 115#define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
 116
 117#define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 118#define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 119#define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 120#define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 121#define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 122#define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 123#define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 124#define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 125#define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 126#define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 127#define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 128#define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 129#define PAGE_KERNEL_VSYSCALL_NOCACHE    __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 130
 131#define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 132#define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 133#define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 134#define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 135
 136/*         xwr */
 137#define __P000  PAGE_NONE
 138#define __P001  PAGE_READONLY
 139#define __P010  PAGE_COPY
 140#define __P011  PAGE_COPY
 141#define __P100  PAGE_READONLY_EXEC
 142#define __P101  PAGE_READONLY_EXEC
 143#define __P110  PAGE_COPY_EXEC
 144#define __P111  PAGE_COPY_EXEC
 145
 146#define __S000  PAGE_NONE
 147#define __S001  PAGE_READONLY
 148#define __S010  PAGE_SHARED
 149#define __S011  PAGE_SHARED
 150#define __S100  PAGE_READONLY_EXEC
 151#define __S101  PAGE_READONLY_EXEC
 152#define __S110  PAGE_SHARED_EXEC
 153#define __S111  PAGE_SHARED_EXEC
 154
 155/*
 156 * early identity mapping  pte attrib macros.
 157 */
 158#ifdef CONFIG_X86_64
 159#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 160#else
 161/*
 162 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
 163 * bits are combined, this will alow user to access the high address mapped
 164 * VDSO in the presence of CONFIG_COMPAT_VDSO
 165 */
 166#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 167#define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
 168#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 169#endif
 170
 171#ifdef CONFIG_X86_32
 172# include "pgtable_32_types.h"
 173#else
 174# include "pgtable_64_types.h"
 175#endif
 176
 177#ifndef __ASSEMBLY__
 178
 179#include <linux/types.h>
 180
 181/* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
 182#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 183
 184/* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
 185#define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 186
 187typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 188
 189typedef struct { pgdval_t pgd; } pgd_t;
 190
 191static inline pgd_t native_make_pgd(pgdval_t val)
 192{
 193        return (pgd_t) { val };
 194}
 195
 196static inline pgdval_t native_pgd_val(pgd_t pgd)
 197{
 198        return pgd.pgd;
 199}
 200
 201static inline pgdval_t pgd_flags(pgd_t pgd)
 202{
 203        return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 204}
 205
 206#if PAGETABLE_LEVELS > 3
 207typedef struct { pudval_t pud; } pud_t;
 208
 209static inline pud_t native_make_pud(pmdval_t val)
 210{
 211        return (pud_t) { val };
 212}
 213
 214static inline pudval_t native_pud_val(pud_t pud)
 215{
 216        return pud.pud;
 217}
 218#else
 219#include <asm-generic/pgtable-nopud.h>
 220
 221static inline pudval_t native_pud_val(pud_t pud)
 222{
 223        return native_pgd_val(pud.pgd);
 224}
 225#endif
 226
 227#if PAGETABLE_LEVELS > 2
 228typedef struct { pmdval_t pmd; } pmd_t;
 229
 230static inline pmd_t native_make_pmd(pmdval_t val)
 231{
 232        return (pmd_t) { val };
 233}
 234
 235static inline pmdval_t native_pmd_val(pmd_t pmd)
 236{
 237        return pmd.pmd;
 238}
 239#else
 240#include <asm-generic/pgtable-nopmd.h>
 241
 242static inline pmdval_t native_pmd_val(pmd_t pmd)
 243{
 244        return native_pgd_val(pmd.pud.pgd);
 245}
 246#endif
 247
 248static inline pudval_t pud_flags(pud_t pud)
 249{
 250        return native_pud_val(pud) & PTE_FLAGS_MASK;
 251}
 252
 253static inline pmdval_t pmd_flags(pmd_t pmd)
 254{
 255        return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 256}
 257
 258static inline pte_t native_make_pte(pteval_t val)
 259{
 260        return (pte_t) { .pte = val };
 261}
 262
 263static inline pteval_t native_pte_val(pte_t pte)
 264{
 265        return pte.pte;
 266}
 267
 268static inline pteval_t pte_flags(pte_t pte)
 269{
 270        return native_pte_val(pte) & PTE_FLAGS_MASK;
 271}
 272
 273#define pgprot_val(x)   ((x).pgprot)
 274#define __pgprot(x)     ((pgprot_t) { (x) } )
 275
 276
 277typedef struct page *pgtable_t;
 278
 279extern pteval_t __supported_pte_mask;
 280extern void set_nx(void);
 281extern int nx_enabled;
 282
 283#define pgprot_writecombine     pgprot_writecombine
 284extern pgprot_t pgprot_writecombine(pgprot_t prot);
 285
 286/* Indicate that x86 has its own track and untrack pfn vma functions */
 287#define __HAVE_PFNMAP_TRACKING
 288
 289#define __HAVE_PHYS_MEM_ACCESS_PROT
 290struct file;
 291pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 292                              unsigned long size, pgprot_t vma_prot);
 293int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 294                              unsigned long size, pgprot_t *vma_prot);
 295
 296/* Install a pte for a particular vaddr in kernel space. */
 297void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 298
 299#ifdef CONFIG_X86_32
 300extern void native_pagetable_setup_start(pgd_t *base);
 301extern void native_pagetable_setup_done(pgd_t *base);
 302#else
 303#define native_pagetable_setup_start x86_init_pgd_noop
 304#define native_pagetable_setup_done  x86_init_pgd_noop
 305#endif
 306
 307struct seq_file;
 308extern void arch_report_meminfo(struct seq_file *m);
 309
 310enum {
 311        PG_LEVEL_NONE,
 312        PG_LEVEL_4K,
 313        PG_LEVEL_2M,
 314        PG_LEVEL_1G,
 315        PG_LEVEL_NUM
 316};
 317
 318#ifdef CONFIG_PROC_FS
 319extern void update_page_count(int level, unsigned long pages);
 320#else
 321static inline void update_page_count(int level, unsigned long pages) { }
 322#endif
 323
 324/*
 325 * Helper function that returns the kernel pagetable entry controlling
 326 * the virtual address 'address'. NULL means no pagetable entry present.
 327 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 328 * as a pte too.
 329 */
 330extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 331
 332#endif  /* !__ASSEMBLY__ */
 333
 334#endif /* _ASM_X86_PGTABLE_DEFS_H */
 335