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#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  68                         _PAGE_ACCESSED | _PAGE_DIRTY)
  69#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  70                         _PAGE_DIRTY)
  71
  72/* Set of bits not changed in pte_modify */
  73#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
  74                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
  75#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
  76
  77#define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
  78#define _PAGE_CACHE_WB          (0)
  79#define _PAGE_CACHE_WC          (_PAGE_PWT)
  80#define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
  81#define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
  82
  83#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  84#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  85                                 _PAGE_ACCESSED | _PAGE_NX)
  86
  87#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  88                                         _PAGE_USER | _PAGE_ACCESSED)
  89#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  90                                         _PAGE_ACCESSED | _PAGE_NX)
  91#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  92                                         _PAGE_ACCESSED)
  93#define PAGE_COPY               PAGE_COPY_NOEXEC
  94#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  95                                         _PAGE_ACCESSED | _PAGE_NX)
  96#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  97                                         _PAGE_ACCESSED)
  98
  99#define __PAGE_KERNEL_EXEC                                              \
 100        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 101#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 102
 103#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 104#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 105#define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
 106#define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
 107#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 108#define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 109#define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 110#define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 111#define __PAGE_KERNEL_VVAR_NOCACHE      (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
 112#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 113#define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 114#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 115
 116#define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
 117#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
 118#define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
 119#define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
 120
 121#define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 122#define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 123#define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 124#define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 125#define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 126#define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 127#define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 128#define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 129#define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 130#define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 131#define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 132#define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 133#define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 134#define PAGE_KERNEL_VVAR_NOCACHE        __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
 135
 136#define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 137#define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 138#define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 139#define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 140
 141/*         xwr */
 142#define __P000  PAGE_NONE
 143#define __P001  PAGE_READONLY
 144#define __P010  PAGE_COPY
 145#define __P011  PAGE_COPY
 146#define __P100  PAGE_READONLY_EXEC
 147#define __P101  PAGE_READONLY_EXEC
 148#define __P110  PAGE_COPY_EXEC
 149#define __P111  PAGE_COPY_EXEC
 150
 151#define __S000  PAGE_NONE
 152#define __S001  PAGE_READONLY
 153#define __S010  PAGE_SHARED
 154#define __S011  PAGE_SHARED
 155#define __S100  PAGE_READONLY_EXEC
 156#define __S101  PAGE_READONLY_EXEC
 157#define __S110  PAGE_SHARED_EXEC
 158#define __S111  PAGE_SHARED_EXEC
 159
 160/*
 161 * early identity mapping  pte attrib macros.
 162 */
 163#ifdef CONFIG_X86_64
 164#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 165#else
 166/*
 167 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
 168 * bits are combined, this will alow user to access the high address mapped
 169 * VDSO in the presence of CONFIG_COMPAT_VDSO
 170 */
 171#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 172#define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
 173#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 174#endif
 175
 176#ifdef CONFIG_X86_32
 177# include <asm/pgtable_32_types.h>
 178#else
 179# include <asm/pgtable_64_types.h>
 180#endif
 181
 182#ifndef __ASSEMBLY__
 183
 184#include <linux/types.h>
 185
 186/* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
 187#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 188
 189/* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
 190#define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 191
 192typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 193
 194typedef struct { pgdval_t pgd; } pgd_t;
 195
 196static inline pgd_t native_make_pgd(pgdval_t val)
 197{
 198        return (pgd_t) { val };
 199}
 200
 201static inline pgdval_t native_pgd_val(pgd_t pgd)
 202{
 203        return pgd.pgd;
 204}
 205
 206static inline pgdval_t pgd_flags(pgd_t pgd)
 207{
 208        return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 209}
 210
 211#if PAGETABLE_LEVELS > 3
 212typedef struct { pudval_t pud; } pud_t;
 213
 214static inline pud_t native_make_pud(pmdval_t val)
 215{
 216        return (pud_t) { val };
 217}
 218
 219static inline pudval_t native_pud_val(pud_t pud)
 220{
 221        return pud.pud;
 222}
 223#else
 224#include <asm-generic/pgtable-nopud.h>
 225
 226static inline pudval_t native_pud_val(pud_t pud)
 227{
 228        return native_pgd_val(pud.pgd);
 229}
 230#endif
 231
 232#if PAGETABLE_LEVELS > 2
 233typedef struct { pmdval_t pmd; } pmd_t;
 234
 235static inline pmd_t native_make_pmd(pmdval_t val)
 236{
 237        return (pmd_t) { val };
 238}
 239
 240static inline pmdval_t native_pmd_val(pmd_t pmd)
 241{
 242        return pmd.pmd;
 243}
 244#else
 245#include <asm-generic/pgtable-nopmd.h>
 246
 247static inline pmdval_t native_pmd_val(pmd_t pmd)
 248{
 249        return native_pgd_val(pmd.pud.pgd);
 250}
 251#endif
 252
 253static inline pudval_t pud_flags(pud_t pud)
 254{
 255        return native_pud_val(pud) & PTE_FLAGS_MASK;
 256}
 257
 258static inline pmdval_t pmd_flags(pmd_t pmd)
 259{
 260        return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 261}
 262
 263static inline pte_t native_make_pte(pteval_t val)
 264{
 265        return (pte_t) { .pte = val };
 266}
 267
 268static inline pteval_t native_pte_val(pte_t pte)
 269{
 270        return pte.pte;
 271}
 272
 273static inline pteval_t pte_flags(pte_t pte)
 274{
 275        return native_pte_val(pte) & PTE_FLAGS_MASK;
 276}
 277
 278#define pgprot_val(x)   ((x).pgprot)
 279#define __pgprot(x)     ((pgprot_t) { (x) } )
 280
 281
 282typedef struct page *pgtable_t;
 283
 284extern pteval_t __supported_pte_mask;
 285extern void set_nx(void);
 286extern int nx_enabled;
 287
 288#define pgprot_writecombine     pgprot_writecombine
 289extern pgprot_t pgprot_writecombine(pgprot_t prot);
 290
 291/* Indicate that x86 has its own track and untrack pfn vma functions */
 292#define __HAVE_PFNMAP_TRACKING
 293
 294#define __HAVE_PHYS_MEM_ACCESS_PROT
 295struct file;
 296pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 297                              unsigned long size, pgprot_t vma_prot);
 298int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 299                              unsigned long size, pgprot_t *vma_prot);
 300
 301/* Install a pte for a particular vaddr in kernel space. */
 302void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 303
 304extern void native_pagetable_reserve(u64 start, u64 end);
 305#ifdef CONFIG_X86_32
 306extern void native_pagetable_init(void);
 307#else
 308#define native_pagetable_init        paging_init
 309#endif
 310
 311struct seq_file;
 312extern void arch_report_meminfo(struct seq_file *m);
 313
 314enum {
 315        PG_LEVEL_NONE,
 316        PG_LEVEL_4K,
 317        PG_LEVEL_2M,
 318        PG_LEVEL_1G,
 319        PG_LEVEL_NUM
 320};
 321
 322#ifdef CONFIG_PROC_FS
 323extern void update_page_count(int level, unsigned long pages);
 324#else
 325static inline void update_page_count(int level, unsigned long pages) { }
 326#endif
 327
 328/*
 329 * Helper function that returns the kernel pagetable entry controlling
 330 * the virtual address 'address'. NULL means no pagetable entry present.
 331 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 332 * as a pte too.
 333 */
 334extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 335
 336#endif  /* !__ASSEMBLY__ */
 337
 338#endif /* _ASM_X86_PGTABLE_DEFS_H */
 339