1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_PGTABLE_H 17 #define __ASM_PGTABLE_H 18 19 #include <asm/proc-fns.h> 20 21 #include <asm/memory.h> 22 #include <asm/pgtable-hwdef.h> 23 24 /* 25 * Software defined PTE bits definition. 26 */ 27 #define PTE_VALID (_AT(pteval_t, 1) << 0) 28 #define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ 29 #define PTE_DIRTY (_AT(pteval_t, 1) << 55) 30 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) 31 #define PTE_WRITE (_AT(pteval_t, 1) << 57) 32 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ 33 34 /* 35 * VMALLOC and SPARSEMEM_VMEMMAP ranges. 36 * 37 * VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array 38 * (rounded up to PUD_SIZE). 39 * VMALLOC_START: beginning of the kernel VA space 40 * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space, 41 * fixed mappings and modules 42 */ 43 #define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE) 44 #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) 45 #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) 46 47 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 48 49 #define FIRST_USER_ADDRESS 0 50 51 #ifndef __ASSEMBLY__ 52 extern void __pte_error(const char *file, int line, unsigned long val); 53 extern void __pmd_error(const char *file, int line, unsigned long val); 54 extern void __pud_error(const char *file, int line, unsigned long val); 55 extern void __pgd_error(const char *file, int line, unsigned long val); 56 57 #ifdef CONFIG_SMP 58 #define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) 59 #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) 60 #else 61 #define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF) 62 #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF) 63 #endif 64 65 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 66 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL_NC)) 67 #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL)) 68 69 #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) 70 #define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 71 #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 72 73 #define _PAGE_DEFAULT (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) 74 75 #define PAGE_KERNEL __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE) 76 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE) 77 78 #define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP) 79 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) 80 81 #define PAGE_S2 __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) 82 #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) 83 84 #define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN) 85 #define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) 86 #define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) 87 #define PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 88 #define PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 89 #define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 90 #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 91 92 #define __P000 PAGE_NONE 93 #define __P001 PAGE_READONLY 94 #define __P010 PAGE_COPY 95 #define __P011 PAGE_COPY 96 #define __P100 PAGE_READONLY_EXEC 97 #define __P101 PAGE_READONLY_EXEC 98 #define __P110 PAGE_COPY_EXEC 99 #define __P111 PAGE_COPY_EXEC 100 101 #define __S000 PAGE_NONE 102 #define __S001 PAGE_READONLY 103 #define __S010 PAGE_SHARED 104 #define __S011 PAGE_SHARED 105 #define __S100 PAGE_READONLY_EXEC 106 #define __S101 PAGE_READONLY_EXEC 107 #define __S110 PAGE_SHARED_EXEC 108 #define __S111 PAGE_SHARED_EXEC 109 110 /* 111 * ZERO_PAGE is a global shared page that is always zero: used 112 * for zero-mapped memory areas etc.. 113 */ 114 extern struct page *empty_zero_page; 115 #define ZERO_PAGE(vaddr) (empty_zero_page) 116 117 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 118 119 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 120 121 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 122 123 #define pte_none(pte) (!pte_val(pte)) 124 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 125 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 126 127 /* Find an entry in the third-level page table. */ 128 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 129 130 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) 131 132 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 133 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 134 #define pte_unmap(pte) do { } while (0) 135 #define pte_unmap_nested(pte) do { } while (0) 136 137 /* 138 * The following only work if pte_present(). Undefined behaviour otherwise. 139 */ 140 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) 141 #define pte_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) 142 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF)) 143 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL)) 144 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE)) 145 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 146 147 #define pte_valid_user(pte) \ 148 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 149 #define pte_valid_not_user(pte) \ 150 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID) 151 152 static inline pte_t pte_wrprotect(pte_t pte) 153 { 154 pte_val(pte) &= ~PTE_WRITE; 155 return pte; 156 } 157 158 static inline pte_t pte_mkwrite(pte_t pte) 159 { 160 pte_val(pte) |= PTE_WRITE; 161 return pte; 162 } 163 164 static inline pte_t pte_mkclean(pte_t pte) 165 { 166 pte_val(pte) &= ~PTE_DIRTY; 167 return pte; 168 } 169 170 static inline pte_t pte_mkdirty(pte_t pte) 171 { 172 pte_val(pte) |= PTE_DIRTY; 173 return pte; 174 } 175 176 static inline pte_t pte_mkold(pte_t pte) 177 { 178 pte_val(pte) &= ~PTE_AF; 179 return pte; 180 } 181 182 static inline pte_t pte_mkyoung(pte_t pte) 183 { 184 pte_val(pte) |= PTE_AF; 185 return pte; 186 } 187 188 static inline pte_t pte_mkspecial(pte_t pte) 189 { 190 pte_val(pte) |= PTE_SPECIAL; 191 return pte; 192 } 193 194 static inline void set_pte(pte_t *ptep, pte_t pte) 195 { 196 *ptep = pte; 197 198 /* 199 * Only if the new pte is valid and kernel, otherwise TLB maintenance 200 * or update_mmu_cache() have the necessary barriers. 201 */ 202 if (pte_valid_not_user(pte)) { 203 dsb(ishst); 204 isb(); 205 } 206 } 207 208 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 209 210 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 211 pte_t *ptep, pte_t pte) 212 { 213 if (pte_valid_user(pte)) { 214 if (!pte_special(pte) && pte_exec(pte)) 215 __sync_icache_dcache(pte, addr); 216 if (pte_dirty(pte) && pte_write(pte)) 217 pte_val(pte) &= ~PTE_RDONLY; 218 else 219 pte_val(pte) |= PTE_RDONLY; 220 } 221 222 set_pte(ptep, pte); 223 } 224 225 /* 226 * Huge pte definitions. 227 */ 228 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) 229 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 230 231 /* 232 * Hugetlb definitions. 233 */ 234 #define HUGE_MAX_HSTATE 2 235 #define HPAGE_SHIFT PMD_SHIFT 236 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 237 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 238 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 239 240 #define __HAVE_ARCH_PTE_SPECIAL 241 242 static inline pte_t pmd_pte(pmd_t pmd) 243 { 244 return __pte(pmd_val(pmd)); 245 } 246 247 static inline pmd_t pte_pmd(pte_t pte) 248 { 249 return __pmd(pte_val(pte)); 250 } 251 252 /* 253 * THP definitions. 254 */ 255 256 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 257 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) 258 #define pmd_trans_splitting(pmd) pte_special(pmd_pte(pmd)) 259 #endif 260 261 #define pmd_young(pmd) pte_young(pmd_pte(pmd)) 262 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) 263 #define pmd_mksplitting(pmd) pte_pmd(pte_mkspecial(pmd_pte(pmd))) 264 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) 265 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) 266 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) 267 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) 268 #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_TYPE_MASK)) 269 270 #define __HAVE_ARCH_PMD_WRITE 271 #define pmd_write(pmd) pte_write(pmd_pte(pmd)) 272 273 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 274 275 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 276 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 277 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 278 279 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 280 #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 281 282 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) 283 284 static inline int has_transparent_hugepage(void) 285 { 286 return 1; 287 } 288 289 #define __pgprot_modify(prot,mask,bits) \ 290 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 291 292 /* 293 * Mark the prot value as uncacheable and unbufferable. 294 */ 295 #define pgprot_noncached(prot) \ 296 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) 297 #define pgprot_writecombine(prot) \ 298 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) 299 #define __HAVE_PHYS_MEM_ACCESS_PROT 300 struct file; 301 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 302 unsigned long size, pgprot_t vma_prot); 303 304 #define pmd_none(pmd) (!pmd_val(pmd)) 305 #define pmd_present(pmd) (pmd_val(pmd)) 306 307 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 308 309 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 310 PMD_TYPE_TABLE) 311 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 312 PMD_TYPE_SECT) 313 314 #ifdef CONFIG_ARM64_64K_PAGES 315 #define pud_sect(pud) (0) 316 #else 317 #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 318 PUD_TYPE_SECT) 319 #endif 320 321 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 322 { 323 *pmdp = pmd; 324 dsb(ishst); 325 isb(); 326 } 327 328 static inline void pmd_clear(pmd_t *pmdp) 329 { 330 set_pmd(pmdp, __pmd(0)); 331 } 332 333 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 334 { 335 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 336 } 337 338 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 339 340 /* 341 * Conversion functions: convert a page and protection to a page entry, 342 * and a page entry and page directory to the page they refer to. 343 */ 344 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 345 346 #if CONFIG_ARM64_PGTABLE_LEVELS > 2 347 348 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 349 350 #define pud_none(pud) (!pud_val(pud)) 351 #define pud_bad(pud) (!(pud_val(pud) & 2)) 352 #define pud_present(pud) (pud_val(pud)) 353 354 static inline void set_pud(pud_t *pudp, pud_t pud) 355 { 356 *pudp = pud; 357 dsb(ishst); 358 isb(); 359 } 360 361 static inline void pud_clear(pud_t *pudp) 362 { 363 set_pud(pudp, __pud(0)); 364 } 365 366 static inline pmd_t *pud_page_vaddr(pud_t pud) 367 { 368 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 369 } 370 371 /* Find an entry in the second-level page table. */ 372 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 373 374 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 375 { 376 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 377 } 378 379 #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 2 */ 380 381 #if CONFIG_ARM64_PGTABLE_LEVELS > 3 382 383 #define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud)) 384 385 #define pgd_none(pgd) (!pgd_val(pgd)) 386 #define pgd_bad(pgd) (!(pgd_val(pgd) & 2)) 387 #define pgd_present(pgd) (pgd_val(pgd)) 388 389 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) 390 { 391 *pgdp = pgd; 392 dsb(ishst); 393 } 394 395 static inline void pgd_clear(pgd_t *pgdp) 396 { 397 set_pgd(pgdp, __pgd(0)); 398 } 399 400 static inline pud_t *pgd_page_vaddr(pgd_t pgd) 401 { 402 return __va(pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK); 403 } 404 405 /* Find an entry in the frst-level page table. */ 406 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) 407 408 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long addr) 409 { 410 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(addr); 411 } 412 413 #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 3 */ 414 415 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 416 417 /* to find an entry in a page-table-directory */ 418 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 419 420 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 421 422 /* to find an entry in a kernel page-table-directory */ 423 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 424 425 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 426 { 427 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 428 PTE_PROT_NONE | PTE_VALID | PTE_WRITE; 429 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 430 return pte; 431 } 432 433 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 434 { 435 return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); 436 } 437 438 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 439 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 440 441 /* 442 * Encode and decode a swap entry: 443 * bits 0-1: present (must be zero) 444 * bit 2: PTE_FILE 445 * bits 3-8: swap type 446 * bits 9-57: swap offset 447 */ 448 #define __SWP_TYPE_SHIFT 3 449 #define __SWP_TYPE_BITS 6 450 #define __SWP_OFFSET_BITS 49 451 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 452 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 453 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) 454 455 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 456 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) 457 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 458 459 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 460 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 461 462 /* 463 * Ensure that there are not more swap files than can be encoded in the kernel 464 * PTEs. 465 */ 466 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 467 468 /* 469 * Encode and decode a file entry: 470 * bits 0-1: present (must be zero) 471 * bit 2: PTE_FILE 472 * bits 3-57: file offset / PAGE_SIZE 473 */ 474 #define pte_file(pte) (pte_val(pte) & PTE_FILE) 475 #define pte_to_pgoff(x) (pte_val(x) >> 3) 476 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) 477 478 #define PTE_FILE_MAX_BITS 55 479 480 extern int kern_addr_valid(unsigned long addr); 481 482 #include <asm-generic/pgtable.h> 483 484 #define pgtable_cache_init() do { } while (0) 485 486 #endif /* !__ASSEMBLY__ */ 487 488 #endif /* __ASM_PGTABLE_H */ 489