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_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
 187 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 188
 189 typedef struct { pgdval_t pgd; } pgd_t;
 190
 191 static inline pgd_t native_make_pgd(pgdval_t val)
 192 {
 193         return (pgd_t) { val };
 194 }
 195
 196 static inline pgdval_t native_pgd_val(pgd_t pgd)
 197 {
 198         return pgd.pgd;
 199 }
 200
 201 static 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
 207 typedef struct { pudval_t pud; } pud_t;
 208
 209 static inline pud_t native_make_pud(pmdval_t val)
 210 {
 211         return (pud_t) { val };
 212 }
 213
 214 static 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
 221 static 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
 228 typedef struct { pmdval_t pmd; } pmd_t;
 229
 230 static inline pmd_t native_make_pmd(pmdval_t val)
 231 {
 232         return (pmd_t) { val };
 233 }
 234
 235 static 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
 242 static inline pmdval_t native_pmd_val(pmd_t pmd)
 243 {
 244         return native_pgd_val(pmd.pud.pgd);
 245 }
 246 #endif
 247
 248 static inline pudval_t pud_flags(pud_t pud)
 249 {
 250         return native_pud_val(pud) & PTE_FLAGS_MASK;
 251 }
 252
 253 static inline pmdval_t pmd_flags(pmd_t pmd)
 254 {
 255         return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 256 }
 257
 258 static inline pte_t native_make_pte(pteval_t val)
 259 {
 260         return (pte_t) { .pte = val };
 261 }
 262
 263 static inline pteval_t native_pte_val(pte_t pte)
 264 {
 265         return pte.pte;
 266 }
 267
 268 static 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
 277 typedef struct page *pgtable_t;
 278
 279 extern pteval_t __supported_pte_mask;
 280 extern void set_nx(void);
 281 extern int nx_enabled;
 282
 283 #define pgprot_writecombine     pgprot_writecombine
 284 extern 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
 290 struct file;
 291 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 292                               unsigned long size, pgprot_t vma_prot);
 293 int 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. */
 297 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 298
 299 #ifdef CONFIG_X86_32
 300 extern void native_pagetable_setup_start(pgd_t *base);
 301 extern 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
 307 struct seq_file;
 308 extern void arch_report_meminfo(struct seq_file *m);
 309
 310 enum {
 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
 319 extern void update_page_count(int level, unsigned long pages);
 320 #else
 321 static 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  */
 330 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 331
 332 #endif  /* !__ASSEMBLY__ */
 333
 334 #endif /* _ASM_X86_PGTABLE_DEFS_H */