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_UNUSED3       11
  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_UNUSED3   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
  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 __HAVE_ARCH_PTE_SPECIAL
  50
  51 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  52 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  53 #else
  54 #define _PAGE_NX        (_AT(pteval_t, 0))
  55 #endif
  56
  57 #define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
  58 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  59
  60 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  61                          _PAGE_ACCESSED | _PAGE_DIRTY)
  62 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  63                          _PAGE_DIRTY)
  64
  65 /* Set of bits not changed in pte_modify */
  66 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
  67                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
  68
  69 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
  70 #define _PAGE_CACHE_WB          (0)
  71 #define _PAGE_CACHE_WC          (_PAGE_PWT)
  72 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
  73 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
  74
  75 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  76 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  77                                  _PAGE_ACCESSED | _PAGE_NX)
  78
  79 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  80                                          _PAGE_USER | _PAGE_ACCESSED)
  81 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  82                                          _PAGE_ACCESSED | _PAGE_NX)
  83 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  84                                          _PAGE_ACCESSED)
  85 #define PAGE_COPY               PAGE_COPY_NOEXEC
  86 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  87                                          _PAGE_ACCESSED | _PAGE_NX)
  88 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  89                                          _PAGE_ACCESSED)
  90
  91 #define __PAGE_KERNEL_EXEC                                              \
  92         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
  93 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  94
  95 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
  96 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
  97 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
  98 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
  99 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
 100 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
 101 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 102 #define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
 103 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 104 #define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 105 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 106
 107 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
 108 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
 109 #define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
 110 #define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
 111
 112 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 113 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 114 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 115 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 116 #define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 117 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 118 #define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 119 #define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 120 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 121 #define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 122 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 123 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 124 #define PAGE_KERNEL_VSYSCALL_NOCACHE    __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 125
 126 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 127 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 128 #define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 129 #define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 130
 131 /*         xwr */
 132 #define __P000  PAGE_NONE
 133 #define __P001  PAGE_READONLY
 134 #define __P010  PAGE_COPY
 135 #define __P011  PAGE_COPY
 136 #define __P100  PAGE_READONLY_EXEC
 137 #define __P101  PAGE_READONLY_EXEC
 138 #define __P110  PAGE_COPY_EXEC
 139 #define __P111  PAGE_COPY_EXEC
 140
 141 #define __S000  PAGE_NONE
 142 #define __S001  PAGE_READONLY
 143 #define __S010  PAGE_SHARED
 144 #define __S011  PAGE_SHARED
 145 #define __S100  PAGE_READONLY_EXEC
 146 #define __S101  PAGE_READONLY_EXEC
 147 #define __S110  PAGE_SHARED_EXEC
 148 #define __S111  PAGE_SHARED_EXEC
 149
 150 /*
 151  * early identity mapping  pte attrib macros.
 152  */
 153 #ifdef CONFIG_X86_64
 154 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 155 #else
 156 /*
 157  * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
 158  * bits are combined, this will alow user to access the high address mapped
 159  * VDSO in the presence of CONFIG_COMPAT_VDSO
 160  */
 161 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 162 #define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
 163 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 164 #endif
 165
 166 #ifdef CONFIG_X86_32
 167 # include "pgtable_32_types.h"
 168 #else
 169 # include "pgtable_64_types.h"
 170 #endif
 171
 172 #ifndef __ASSEMBLY__
 173
 174 #include <linux/types.h>
 175
 176 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
 177 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 178
 179 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
 180 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 181
 182 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 183
 184 typedef struct { pgdval_t pgd; } pgd_t;
 185
 186 static inline pgd_t native_make_pgd(pgdval_t val)
 187 {
 188         return (pgd_t) { val };
 189 }
 190
 191 static inline pgdval_t native_pgd_val(pgd_t pgd)
 192 {
 193         return pgd.pgd;
 194 }
 195
 196 static inline pgdval_t pgd_flags(pgd_t pgd)
 197 {
 198         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 199 }
 200
 201 #if PAGETABLE_LEVELS > 3
 202 typedef struct { pudval_t pud; } pud_t;
 203
 204 static inline pud_t native_make_pud(pmdval_t val)
 205 {
 206         return (pud_t) { val };
 207 }
 208
 209 static inline pudval_t native_pud_val(pud_t pud)
 210 {
 211         return pud.pud;
 212 }
 213 #else
 214 #include <asm-generic/pgtable-nopud.h>
 215
 216 static inline pudval_t native_pud_val(pud_t pud)
 217 {
 218         return native_pgd_val(pud.pgd);
 219 }
 220 #endif
 221
 222 #if PAGETABLE_LEVELS > 2
 223 typedef struct { pmdval_t pmd; } pmd_t;
 224
 225 static inline pmd_t native_make_pmd(pmdval_t val)
 226 {
 227         return (pmd_t) { val };
 228 }
 229
 230 static inline pmdval_t native_pmd_val(pmd_t pmd)
 231 {
 232         return pmd.pmd;
 233 }
 234 #else
 235 #include <asm-generic/pgtable-nopmd.h>
 236
 237 static inline pmdval_t native_pmd_val(pmd_t pmd)
 238 {
 239         return native_pgd_val(pmd.pud.pgd);
 240 }
 241 #endif
 242
 243 static inline pudval_t pud_flags(pud_t pud)
 244 {
 245         return native_pud_val(pud) & PTE_FLAGS_MASK;
 246 }
 247
 248 static inline pmdval_t pmd_flags(pmd_t pmd)
 249 {
 250         return native_pmd_val(pmd) & PTE_FLAGS_MASK;
 251 }
 252
 253 static inline pte_t native_make_pte(pteval_t val)
 254 {
 255         return (pte_t) { .pte = val };
 256 }
 257
 258 static inline pteval_t native_pte_val(pte_t pte)
 259 {
 260         return pte.pte;
 261 }
 262
 263 static inline pteval_t pte_flags(pte_t pte)
 264 {
 265         return native_pte_val(pte) & PTE_FLAGS_MASK;
 266 }
 267
 268 #define pgprot_val(x)   ((x).pgprot)
 269 #define __pgprot(x)     ((pgprot_t) { (x) } )
 270
 271
 272 typedef struct page *pgtable_t;
 273
 274 extern pteval_t __supported_pte_mask;
 275 extern int nx_enabled;
 276 extern void set_nx(void);
 277
 278 #define pgprot_writecombine     pgprot_writecombine
 279 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 280
 281 /* Indicate that x86 has its own track and untrack pfn vma functions */
 282 #define __HAVE_PFNMAP_TRACKING
 283
 284 #define __HAVE_PHYS_MEM_ACCESS_PROT
 285 struct file;
 286 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 287                               unsigned long size, pgprot_t vma_prot);
 288 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 289                               unsigned long size, pgprot_t *vma_prot);
 290
 291 /* Install a pte for a particular vaddr in kernel space. */
 292 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 293
 294 #ifdef CONFIG_X86_32
 295 extern void native_pagetable_setup_start(pgd_t *base);
 296 extern void native_pagetable_setup_done(pgd_t *base);
 297 #else
 298 static inline void native_pagetable_setup_start(pgd_t *base) {}
 299 static inline void native_pagetable_setup_done(pgd_t *base) {}
 300 #endif
 301
 302 struct seq_file;
 303 extern void arch_report_meminfo(struct seq_file *m);
 304
 305 enum {
 306         PG_LEVEL_NONE,
 307         PG_LEVEL_4K,
 308         PG_LEVEL_2M,
 309         PG_LEVEL_1G,
 310         PG_LEVEL_NUM
 311 };
 312
 313 #ifdef CONFIG_PROC_FS
 314 extern void update_page_count(int level, unsigned long pages);
 315 #else
 316 static inline void update_page_count(int level, unsigned long pages) { }
 317 #endif
 318
 319 /*
 320  * Helper function that returns the kernel pagetable entry controlling
 321  * the virtual address 'address'. NULL means no pagetable entry present.
 322  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 323  * as a pte too.
 324  */
 325 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 326
 327 #endif  /* !__ASSEMBLY__ */
 328
 329 #endif /* _ASM_X86_PGTABLE_DEFS_H */