| | 1 | #ifndef _ASM_X86_PGTABLE_H |
| | 2 | #define _ASM_X86_PGTABLE_H |
| | 3 | |
| | 4 | #define FIRST_USER_ADDRESS 0 |
| | 5 | |
| | 6 | #define _PAGE_BIT_PRESENT 0 /* is present */ |
| | 7 | #define _PAGE_BIT_RW 1 /* writeable */ |
| | 8 | #define _PAGE_BIT_USER 2 /* userspace addressable */ |
| | 9 | #define _PAGE_BIT_PWT 3 /* page write through */ |
| | 10 | #define _PAGE_BIT_PCD 4 /* page cache disabled */ |
| | 11 | #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */ |
| | 12 | #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */ |
| | 13 | #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */ |
| | 14 | #define _PAGE_BIT_PAT 7 /* on 4KB pages */ |
| | 15 | #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */ |
| | 16 | #define _PAGE_BIT_UNUSED1 9 /* available for programmer */ |
| | 17 | #define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */ |
| | 18 | #define _PAGE_BIT_UNUSED3 11 |
| | 19 | #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */ |
| | 20 | #define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1 |
| | 21 | #define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1 |
| | 22 | #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */ |
| | 23 | |
| | 24 | /* If _PAGE_BIT_PRESENT is clear, we use these: */ |
| | 25 | /* - if the user mapped it with PROT_NONE; pte_present gives true */ |
| | 26 | #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL |
| | 27 | /* - set: nonlinear file mapping, saved PTE; unset:swap */ |
| | 28 | #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY |
| | 29 | |
| | 30 | #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT) |
| | 31 | #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW) |
| | 32 | #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER) |
| | 33 | #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT) |
| | 34 | #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD) |
| | 35 | #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED) |
| | 36 | #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY) |
| | 37 | #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE) |
| | 38 | #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL) |
| | 39 | #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1) |
| | 40 | #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP) |
| | 41 | #define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3) |
| | 42 | #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT) |
| | 43 | #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE) |
| | 44 | #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL) |
| | 45 | #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST) |
| | 46 | #define __HAVE_ARCH_PTE_SPECIAL |
| | 47 | |
| | 48 | #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) |
| | 49 | #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX) |
| | 50 | #else |
| | 51 | #define _PAGE_NX (_AT(pteval_t, 0)) |
| | 52 | #endif |
| | 53 | |
| | 54 | #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE) |
| | 55 | #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE) |
| | 56 | |
| | 57 | #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ |
| | 58 | _PAGE_ACCESSED | _PAGE_DIRTY) |
| | 59 | #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \ |
| | 60 | _PAGE_DIRTY) |
| | 61 | |
| | 62 | /* Set of bits not changed in pte_modify */ |
| | 63 | #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \ |
| | 64 | _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY) |
| | 65 | |
| | 66 | #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT) |
| | 67 | #define _PAGE_CACHE_WB (0) |
| | 68 | #define _PAGE_CACHE_WC (_PAGE_PWT) |
| | 69 | #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD) |
| | 70 | #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT) |
| | 71 | |
| | 72 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) |
| | 73 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ |
| | 74 | _PAGE_ACCESSED | _PAGE_NX) |
| | 75 | |
| | 76 | #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \ |
| | 77 | _PAGE_USER | _PAGE_ACCESSED) |
| | 78 | #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \ |
| | 79 | _PAGE_ACCESSED | _PAGE_NX) |
| | 80 | #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \ |
| | 81 | _PAGE_ACCESSED) |
| | 82 | #define PAGE_COPY PAGE_COPY_NOEXEC |
| | 83 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \ |
| | 84 | _PAGE_ACCESSED | _PAGE_NX) |
| | 85 | #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \ |
| | 86 | _PAGE_ACCESSED) |
| | 87 | |
| | 88 | #define __PAGE_KERNEL_EXEC \ |
| | 89 | (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL) |
| | 90 | #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX) |
| | 91 | |
| | 92 | #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW) |
| | 93 | #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW) |
| | 94 | #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT) |
| | 95 | #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC) |
| | 96 | #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT) |
| | 97 | #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD) |
| | 98 | #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER) |
| | 99 | #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT) |
| | 100 | #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE) |
| | 101 | #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE) |
| | 102 | #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE) |
| | 103 | |
| | 104 | #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP) |
| | 105 | #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP) |
| | 106 | #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP) |
| | 107 | #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP) |
| | 108 | |
| | 109 | #define PAGE_KERNEL __pgprot(__PAGE_KERNEL) |
| | 110 | #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO) |
| | 111 | #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC) |
| | 112 | #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX) |
| | 113 | #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC) |
| | 114 | #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE) |
| | 115 | #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS) |
| | 116 | #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE) |
| | 117 | #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE) |
| | 118 | #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE) |
| | 119 | #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC) |
| | 120 | #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL) |
| | 121 | #define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE) |
| | 122 | |
| | 123 | #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO) |
| | 124 | #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE) |
| | 125 | #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS) |
| | 126 | #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC) |
| | 127 | |
| | 128 | /* xwr */ |
| | 129 | #define __P000 PAGE_NONE |
| | 130 | #define __P001 PAGE_READONLY |
| | 131 | #define __P010 PAGE_COPY |
| | 132 | #define __P011 PAGE_COPY |
| | 133 | #define __P100 PAGE_READONLY_EXEC |
| | 134 | #define __P101 PAGE_READONLY_EXEC |
| | 135 | #define __P110 PAGE_COPY_EXEC |
| | 136 | #define __P111 PAGE_COPY_EXEC |
| | 137 | |
| | 138 | #define __S000 PAGE_NONE |
| | 139 | #define __S001 PAGE_READONLY |
| | 140 | #define __S010 PAGE_SHARED |
| | 141 | #define __S011 PAGE_SHARED |
| | 142 | #define __S100 PAGE_READONLY_EXEC |
| | 143 | #define __S101 PAGE_READONLY_EXEC |
| | 144 | #define __S110 PAGE_SHARED_EXEC |
| | 145 | #define __S111 PAGE_SHARED_EXEC |
| | 146 | |
| | 147 | /* |
| | 148 | * early identity mapping pte attrib macros. |
| | 149 | */ |
| | 150 | #ifdef CONFIG_X86_64 |
| | 151 | #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC |
| | 152 | #else |
| | 153 | /* |
| | 154 | * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection |
| | 155 | * bits are combined, this will alow user to access the high address mapped |
| | 156 | * VDSO in the presence of CONFIG_COMPAT_VDSO |
| | 157 | */ |
| | 158 | #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */ |
| | 159 | #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */ |
| | 160 | #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */ |
| | 161 | #endif |
| | 162 | |
| | 163 | /* |
| | 164 | * Macro to mark a page protection value as UC- |
| | 165 | */ |
| | 166 | #define pgprot_noncached(prot) \ |
| | 167 | ((boot_cpu_data.x86 > 3) \ |
| | 168 | ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \ |
| | 169 | : (prot)) |
| | 170 | |
| | 171 | #ifndef __ASSEMBLY__ |
| | 172 | |
| | 173 | #define pgprot_writecombine pgprot_writecombine |
| | 174 | extern pgprot_t pgprot_writecombine(pgprot_t prot); |
| | 175 | |
| | 176 | /* |
| | 177 | * ZERO_PAGE is a global shared page that is always zero: used |
| | 178 | * for zero-mapped memory areas etc.. |
| | 179 | */ |
| | 180 | extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; |
| | 181 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| | 182 | |
| | 183 | extern spinlock_t pgd_lock; |
| | 184 | extern struct list_head pgd_list; |
| | 185 | |
| | 186 | /* |
| | 187 | * The following only work if pte_present() is true. |
| | 188 | * Undefined behaviour if not.. |
| | 189 | */ |
| | 190 | static inline int pte_dirty(pte_t pte) |
| | 191 | { |
| | 192 | return pte_flags(pte) & _PAGE_DIRTY; |
| | 193 | } |
| | 194 | |
| | 195 | static inline int pte_young(pte_t pte) |
| | 196 | { |
| | 197 | return pte_flags(pte) & _PAGE_ACCESSED; |
| | 198 | } |
| | 199 | |
| | 200 | static inline int pte_write(pte_t pte) |
| | 201 | { |
| | 202 | return pte_flags(pte) & _PAGE_RW; |
| | 203 | } |
| | 204 | |
| | 205 | static inline int pte_file(pte_t pte) |
| | 206 | { |
| | 207 | return pte_flags(pte) & _PAGE_FILE; |
| | 208 | } |
| | 209 | |
| | 210 | static inline int pte_huge(pte_t pte) |
| | 211 | { |
| | 212 | return pte_flags(pte) & _PAGE_PSE; |
| | 213 | } |
| | 214 | |
| | 215 | static inline int pte_global(pte_t pte) |
| | 216 | { |
| | 217 | return pte_flags(pte) & _PAGE_GLOBAL; |
| | 218 | } |
| | 219 | |
| | 220 | static inline int pte_exec(pte_t pte) |
| | 221 | { |
| | 222 | return !(pte_flags(pte) & _PAGE_NX); |
| | 223 | } |
| | 224 | |
| | 225 | static inline int pte_special(pte_t pte) |
| | 226 | { |
| | 227 | return pte_flags(pte) & _PAGE_SPECIAL; |
| | 228 | } |
| | 229 | |
| | 230 | static inline unsigned long pte_pfn(pte_t pte) |
| | 231 | { |
| | 232 | return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; |
| | 233 | } |
| | 234 | |
| | 235 | #define pte_page(pte) pfn_to_page(pte_pfn(pte)) |
| | 236 | |
| | 237 | static inline int pmd_large(pmd_t pte) |
| | 238 | { |
| | 239 | return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) == |
| | 240 | (_PAGE_PSE | _PAGE_PRESENT); |
| | 241 | } |
| | 242 | |
| | 243 | static inline pte_t pte_mkclean(pte_t pte) |
| | 244 | { |
| | 245 | return __pte(pte_val(pte) & ~_PAGE_DIRTY); |
| | 246 | } |
| | 247 | |
| | 248 | static inline pte_t pte_mkold(pte_t pte) |
| | 249 | { |
| | 250 | return __pte(pte_val(pte) & ~_PAGE_ACCESSED); |
| | 251 | } |
| | 252 | |
| | 253 | static inline pte_t pte_wrprotect(pte_t pte) |
| | 254 | { |
| | 255 | return __pte(pte_val(pte) & ~_PAGE_RW); |
| | 256 | } |
| | 257 | |
| | 258 | static inline pte_t pte_mkexec(pte_t pte) |
| | 259 | { |
| | 260 | return __pte(pte_val(pte) & ~_PAGE_NX); |
| | 261 | } |
| | 262 | |
| | 263 | static inline pte_t pte_mkdirty(pte_t pte) |
| | 264 | { |
| | 265 | return __pte(pte_val(pte) | _PAGE_DIRTY); |
| | 266 | } |
| | 267 | |
| | 268 | static inline pte_t pte_mkyoung(pte_t pte) |
| | 269 | { |
| | 270 | return __pte(pte_val(pte) | _PAGE_ACCESSED); |
| | 271 | } |
| | 272 | |
| | 273 | static inline pte_t pte_mkwrite(pte_t pte) |
| | 274 | { |
| | 275 | return __pte(pte_val(pte) | _PAGE_RW); |
| | 276 | } |
| | 277 | |
| | 278 | static inline pte_t pte_mkhuge(pte_t pte) |
| | 279 | { |
| | 280 | return __pte(pte_val(pte) | _PAGE_PSE); |
| | 281 | } |
| | 282 | |
| | 283 | static inline pte_t pte_clrhuge(pte_t pte) |
| | 284 | { |
| | 285 | return __pte(pte_val(pte) & ~_PAGE_PSE); |
| | 286 | } |
| | 287 | |
| | 288 | static inline pte_t pte_mkglobal(pte_t pte) |
| | 289 | { |
| | 290 | return __pte(pte_val(pte) | _PAGE_GLOBAL); |
| | 291 | } |
| | 292 | |
| | 293 | static inline pte_t pte_clrglobal(pte_t pte) |
| | 294 | { |
| | 295 | return __pte(pte_val(pte) & ~_PAGE_GLOBAL); |
| | 296 | } |
| | 297 | |
| | 298 | static inline pte_t pte_mkspecial(pte_t pte) |
| | 299 | { |
| | 300 | return __pte(pte_val(pte) | _PAGE_SPECIAL); |
| | 301 | } |
| | 302 | |
| | 303 | extern pteval_t __supported_pte_mask; |
| | 304 | |
| | 305 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) |
| | 306 | { |
| | 307 | return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) | |
| | 308 | pgprot_val(pgprot)) & __supported_pte_mask); |
| | 309 | } |
| | 310 | |
| | 311 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) |
| | 312 | { |
| | 313 | return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) | |
| | 314 | pgprot_val(pgprot)) & __supported_pte_mask); |
| | 315 | } |
| | 316 | |
| | 317 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| | 318 | { |
| | 319 | pteval_t val = pte_val(pte); |
| | 320 | |
| | 321 | /* |
| | 322 | * Chop off the NX bit (if present), and add the NX portion of |
| | 323 | * the newprot (if present): |
| | 324 | */ |
| | 325 | val &= _PAGE_CHG_MASK; |
| | 326 | val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask; |
| | 327 | |
| | 328 | return __pte(val); |
| | 329 | } |
| | 330 | |
| | 331 | /* mprotect needs to preserve PAT bits when updating vm_page_prot */ |
| | 332 | #define pgprot_modify pgprot_modify |
| | 333 | static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) |
| | 334 | { |
| | 335 | pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; |
| | 336 | pgprotval_t addbits = pgprot_val(newprot); |
| | 337 | return __pgprot(preservebits | addbits); |
| | 338 | } |
| | 339 | |
| | 340 | #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK) |
| | 341 | |
| | 342 | #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask) |
| | 343 | |
| | 344 | static inline int is_new_memtype_allowed(unsigned long flags, |
| | 345 | unsigned long new_flags) |
| | 346 | { |
| | 347 | /* |
| | 348 | * Certain new memtypes are not allowed with certain |
| | 349 | * requested memtype: |
| | 350 | * - request is uncached, return cannot be write-back |
| | 351 | * - request is write-combine, return cannot be write-back |
| | 352 | */ |
| | 353 | if ((flags == _PAGE_CACHE_UC_MINUS && |
| | 354 | new_flags == _PAGE_CACHE_WB) || |
| | 355 | (flags == _PAGE_CACHE_WC && |
| | 356 | new_flags == _PAGE_CACHE_WB)) { |
| | 357 | return 0; |
| | 358 | } |
| | 359 | |
| | 360 | return 1; |
| | 361 | } |
| | 362 | |
| | 363 | #ifndef __ASSEMBLY__ |
| | 364 | /* Indicate that x86 has its own track and untrack pfn vma functions */ |
| | 365 | #define __HAVE_PFNMAP_TRACKING |
| | 366 | |
| | 367 | #define __HAVE_PHYS_MEM_ACCESS_PROT |
| | 368 | struct file; |
| | 369 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| | 370 | unsigned long size, pgprot_t vma_prot); |
| | 371 | int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, |
| | 372 | unsigned long size, pgprot_t *vma_prot); |
| | 373 | #endif |
| | 374 | |
| | 375 | /* Install a pte for a particular vaddr in kernel space. */ |
| | 376 | void set_pte_vaddr(unsigned long vaddr, pte_t pte); |
| | 377 | |
| | 378 | #ifdef CONFIG_X86_32 |
| | 379 | extern void native_pagetable_setup_start(pgd_t *base); |
| | 380 | extern void native_pagetable_setup_done(pgd_t *base); |
| | 381 | #else |
| | 382 | static inline void native_pagetable_setup_start(pgd_t *base) {} |
| | 383 | static inline void native_pagetable_setup_done(pgd_t *base) {} |
| | 384 | #endif |
| | 385 | |
| | 386 | struct seq_file; |
| | 387 | extern void arch_report_meminfo(struct seq_file *m); |
| | 388 | |
| | 389 | #ifdef CONFIG_PARAVIRT |
| | 390 | #include <asm/paravirt.h> |
| | 391 | #else /* !CONFIG_PARAVIRT */ |
| | 392 | #define set_pte(ptep, pte) native_set_pte(ptep, pte) |
| | 393 | #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) |
| | 394 | |
| | 395 | #define set_pte_present(mm, addr, ptep, pte) \ |
| | 396 | native_set_pte_present(mm, addr, ptep, pte) |
| | 397 | #define set_pte_atomic(ptep, pte) \ |
| | 398 | native_set_pte_atomic(ptep, pte) |
| | 399 | |
| | 400 | #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) |
| | 401 | |
| | 402 | #ifndef __PAGETABLE_PUD_FOLDED |
| | 403 | #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) |
| | 404 | #define pgd_clear(pgd) native_pgd_clear(pgd) |
| | 405 | #endif |
| | 406 | |
| | 407 | #ifndef set_pud |
| | 408 | # define set_pud(pudp, pud) native_set_pud(pudp, pud) |
| | 409 | #endif |
| | 410 | |
| | 411 | #ifndef __PAGETABLE_PMD_FOLDED |
| | 412 | #define pud_clear(pud) native_pud_clear(pud) |
| | 413 | #endif |
| | 414 | |
| | 415 | #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) |
| | 416 | #define pmd_clear(pmd) native_pmd_clear(pmd) |
| | 417 | |
| | 418 | #define pte_update(mm, addr, ptep) do { } while (0) |
| | 419 | #define pte_update_defer(mm, addr, ptep) do { } while (0) |
| | 420 | |
| | 421 | static inline void __init paravirt_pagetable_setup_start(pgd_t *base) |
| | 422 | { |
| | 423 | native_pagetable_setup_start(base); |
| | 424 | } |
| | 425 | |
| | 426 | static inline void __init paravirt_pagetable_setup_done(pgd_t *base) |
| | 427 | { |
| | 428 | native_pagetable_setup_done(base); |
| | 429 | } |
| | 430 | #endif /* CONFIG_PARAVIRT */ |
| | 431 | |
| | 432 | #endif /* __ASSEMBLY__ */ |
| | 433 | |
| | 434 | #ifdef CONFIG_X86_32 |
| | 435 | # include "pgtable_32.h" |
| | 436 | #else |
| | 437 | # include "pgtable_64.h" |
| | 438 | #endif |
| | 439 | |
| | 440 | #ifndef __ASSEMBLY__ |
| | 441 | #include <linux/mm_types.h> |
| | 442 | |
| | 443 | static inline int pte_none(pte_t pte) |
| | 444 | { |
| | 445 | return !pte.pte; |
| | 446 | } |
| | 447 | |
| | 448 | #define __HAVE_ARCH_PTE_SAME |
| | 449 | static inline int pte_same(pte_t a, pte_t b) |
| | 450 | { |
| | 451 | return a.pte == b.pte; |
| | 452 | } |
| | 453 | |
| | 454 | static inline int pte_present(pte_t a) |
| | 455 | { |
| | 456 | return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); |
| | 457 | } |
| | 458 | |
| | 459 | static inline int pmd_present(pmd_t pmd) |
| | 460 | { |
| | 461 | return pmd_val(pmd) & _PAGE_PRESENT; |
| | 462 | } |
| | 463 | |
| | 464 | static inline int pmd_none(pmd_t pmd) |
| | 465 | { |
| | 466 | /* Only check low word on 32-bit platforms, since it might be |
| | 467 | out of sync with upper half. */ |
| | 468 | return !(unsigned long)native_pmd_val(pmd); |
| | 469 | } |
| | 470 | |
| | 471 | static inline unsigned long pmd_page_vaddr(pmd_t pmd) |
| | 472 | { |
| | 473 | return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK); |
| | 474 | } |
| | 475 | |
| | 476 | static inline struct page *pmd_page(pmd_t pmd) |
| | 477 | { |
| | 478 | return pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT); |
| | 479 | } |
| | 480 | |
| | 481 | #if PAGETABLE_LEVELS > 2 |
| | 482 | static inline int pud_present(pud_t pud) |
| | 483 | { |
| | 484 | return pud_val(pud) & _PAGE_PRESENT; |
| | 485 | } |
| | 486 | |
| | 487 | static inline unsigned long pud_page_vaddr(pud_t pud) |
| | 488 | { |
| | 489 | return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK); |
| | 490 | } |
| | 491 | |
| | 492 | static inline struct page *pud_page(pud_t pud) |
| | 493 | { |
| | 494 | return pfn_to_page(pud_val(pud) >> PAGE_SHIFT); |
| | 495 | } |
| | 496 | #endif /* PAGETABLE_LEVELS > 2 */ |
| | 497 | |
| | 498 | #if PAGETABLE_LEVELS > 3 |
| | 499 | static inline int pgd_present(pgd_t pgd) |
| | 500 | { |
| | 501 | return pgd_val(pgd) & _PAGE_PRESENT; |
| | 502 | } |
| | 503 | |
| | 504 | static inline unsigned long pgd_page_vaddr(pgd_t pgd) |
| | 505 | { |
| | 506 | return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); |
| | 507 | } |
| | 508 | |
| | 509 | static inline struct page *pgd_page(pgd_t pgd) |
| | 510 | { |
| | 511 | return pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT); |
| | 512 | } |
| | 513 | |
| | 514 | /* to find an entry in a page-table-directory. */ |
| | 515 | static inline unsigned pud_index(unsigned long address) |
| | 516 | { |
| | 517 | return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); |
| | 518 | } |
| | 519 | |
| | 520 | static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) |
| | 521 | { |
| | 522 | return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address); |
| | 523 | } |
| | 524 | #endif /* PAGETABLE_LEVELS > 3 */ |
| | 525 | |
| | 526 | #endif /* __ASSEMBLY__ */ |
| | 527 | |
| | 528 | /* |
| | 529 | * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] |
| | 530 | * |
| | 531 | * this macro returns the index of the entry in the pgd page which would |
| | 532 | * control the given virtual address |
| | 533 | */ |
| | 534 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) |
| | 535 | |
| | 536 | /* |
| | 537 | * pgd_offset() returns a (pgd_t *) |
| | 538 | * pgd_index() is used get the offset into the pgd page's array of pgd_t's; |
| | 539 | */ |
| | 540 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address))) |
| | 541 | /* |
| | 542 | * a shortcut which implies the use of the kernel's pgd, instead |
| | 543 | * of a process's |
| | 544 | */ |
| | 545 | #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) |
| | 546 | |
| | 547 | |
| | 548 | #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) |
| | 549 | #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) |
| | 550 | |
| | 551 | #ifndef __ASSEMBLY__ |
| | 552 | |
| | 553 | enum { |
| | 554 | PG_LEVEL_NONE, |
| | 555 | PG_LEVEL_4K, |
| | 556 | PG_LEVEL_2M, |
| | 557 | PG_LEVEL_1G, |
| | 558 | PG_LEVEL_NUM |
| | 559 | }; |
| | 560 | |
| | 561 | #ifdef CONFIG_PROC_FS |
| | 562 | extern void update_page_count(int level, unsigned long pages); |
| | 563 | #else |
| | 564 | static inline void update_page_count(int level, unsigned long pages) { } |
| | 565 | #endif |
| | 566 | |
| | 567 | /* |
| | 568 | * Helper function that returns the kernel pagetable entry controlling |
| | 569 | * the virtual address 'address'. NULL means no pagetable entry present. |
| | 570 | * NOTE: the return type is pte_t but if the pmd is PSE then we return it |
| | 571 | * as a pte too. |
| | 572 | */ |
| | 573 | extern pte_t *lookup_address(unsigned long address, unsigned int *level); |
| | 574 | |
| | 575 | /* local pte updates need not use xchg for locking */ |
| | 576 | static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) |
| | 577 | { |
| | 578 | pte_t res = *ptep; |
| | 579 | |
| | 580 | /* Pure native function needs no input for mm, addr */ |
| | 581 | native_pte_clear(NULL, 0, ptep); |
| | 582 | return res; |
| | 583 | } |
| | 584 | |
| | 585 | static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, |
| | 586 | pte_t *ptep , pte_t pte) |
| | 587 | { |
| | 588 | native_set_pte(ptep, pte); |
| | 589 | } |
| | 590 | |
| | 591 | #ifndef CONFIG_PARAVIRT |
| | 592 | /* |
| | 593 | * Rules for using pte_update - it must be called after any PTE update which |
| | 594 | * has not been done using the set_pte / clear_pte interfaces. It is used by |
| | 595 | * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE |
| | 596 | * updates should either be sets, clears, or set_pte_atomic for P->P |
| | 597 | * transitions, which means this hook should only be called for user PTEs. |
| | 598 | * This hook implies a P->P protection or access change has taken place, which |
| | 599 | * requires a subsequent TLB flush. The notification can optionally be delayed |
| | 600 | * until the TLB flush event by using the pte_update_defer form of the |
| | 601 | * interface, but care must be taken to assure that the flush happens while |
| | 602 | * still holding the same page table lock so that the shadow and primary pages |
| | 603 | * do not become out of sync on SMP. |
| | 604 | */ |
| | 605 | #define pte_update(mm, addr, ptep) do { } while (0) |
| | 606 | #define pte_update_defer(mm, addr, ptep) do { } while (0) |
| | 607 | #endif |
| | 608 | |
| | 609 | /* |
| | 610 | * We only update the dirty/accessed state if we set |
| | 611 | * the dirty bit by hand in the kernel, since the hardware |
| | 612 | * will do the accessed bit for us, and we don't want to |
| | 613 | * race with other CPU's that might be updating the dirty |
| | 614 | * bit at the same time. |
| | 615 | */ |
| | 616 | struct vm_area_struct; |
| | 617 | |
| | 618 | #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
| | 619 | extern int ptep_set_access_flags(struct vm_area_struct *vma, |
| | 620 | unsigned long address, pte_t *ptep, |
| | 621 | pte_t entry, int dirty); |
| | 622 | |
| | 623 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
| | 624 | extern int ptep_test_and_clear_young(struct vm_area_struct *vma, |
| | 625 | unsigned long addr, pte_t *ptep); |
| | 626 | |
| | 627 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
| | 628 | extern int ptep_clear_flush_young(struct vm_area_struct *vma, |
| | 629 | unsigned long address, pte_t *ptep); |
| | 630 | |
| | 631 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| | 632 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
| | 633 | pte_t *ptep) |
| | 634 | { |
| | 635 | pte_t pte = native_ptep_get_and_clear(ptep); |
| | 636 | pte_update(mm, addr, ptep); |
| | 637 | return pte; |
| | 638 | } |
| | 639 | |
| | 640 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
| | 641 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
| | 642 | unsigned long addr, pte_t *ptep, |
| | 643 | int full) |
| | 644 | { |
| | 645 | pte_t pte; |
| | 646 | if (full) { |
| | 647 | /* |
| | 648 | * Full address destruction in progress; paravirt does not |
| | 649 | * care about updates and native needs no locking |
| | 650 | */ |
| | 651 | pte = native_local_ptep_get_and_clear(ptep); |
| | 652 | } else { |
| | 653 | pte = ptep_get_and_clear(mm, addr, ptep); |
| | 654 | } |
| | 655 | return pte; |
| | 656 | } |
| | 657 | |
| | 658 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| | 659 | static inline void ptep_set_wrprotect(struct mm_struct *mm, |
| | 660 | unsigned long addr, pte_t *ptep) |
| | 661 | { |
| | 662 | clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); |
| | 663 | pte_update(mm, addr, ptep); |
| | 664 | } |
| | 665 | |
| | 666 | /* |
| | 667 | * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); |
| | 668 | * |
| | 669 | * dst - pointer to pgd range anwhere on a pgd page |
| | 670 | * src - "" |
| | 671 | * count - the number of pgds to copy. |
| | 672 | * |
| | 673 | * dst and src can be on the same page, but the range must not overlap, |
| | 674 | * and must not cross a page boundary. |
| | 675 | */ |
| | 676 | static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) |
| | 677 | { |
| | 678 | memcpy(dst, src, count * sizeof(pgd_t)); |
| | 679 | } |
| | 680 | |
| | 681 | |
| | 682 | #include <asm-generic/pgtable.h> |
| | 683 | #endif /* __ASSEMBLY__ */ |
| | 684 | |
| | 685 | #endif /* _ASM_X86_PGTABLE_H */ |
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