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 #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) 38 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) 39 40 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 41 42 #define FIRST_USER_ADDRESS 0 43 44 #ifndef __ASSEMBLY__ 45 extern void __pte_error(const char *file, int line, unsigned long val); 46 extern void __pmd_error(const char *file, int line, unsigned long val); 47 extern void __pgd_error(const char *file, int line, unsigned long val); 48 49 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 50 #ifndef CONFIG_ARM64_64K_PAGES 51 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 52 #endif 53 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 54 55 #ifdef CONFIG_SMP 56 #define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) 57 #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) 58 #else 59 #define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF) 60 #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF) 61 #endif 62 63 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 64 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL_NC)) 65 #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL)) 66 67 #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) 68 #define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 69 #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 70 71 #define _PAGE_DEFAULT (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) 72 73 #define PAGE_KERNEL __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE) 74 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE) 75 76 #define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP) 77 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) 78 79 #define PAGE_S2 __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) 80 #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) 81 82 #define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN) 83 #define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) 84 #define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) 85 #define PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 86 #define PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 87 #define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 88 #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 89 90 #define __P000 PAGE_NONE 91 #define __P001 PAGE_READONLY 92 #define __P010 PAGE_COPY 93 #define __P011 PAGE_COPY 94 #define __P100 PAGE_READONLY_EXEC 95 #define __P101 PAGE_READONLY_EXEC 96 #define __P110 PAGE_COPY_EXEC 97 #define __P111 PAGE_COPY_EXEC 98 99 #define __S000 PAGE_NONE 100 #define __S001 PAGE_READONLY 101 #define __S010 PAGE_SHARED 102 #define __S011 PAGE_SHARED 103 #define __S100 PAGE_READONLY_EXEC 104 #define __S101 PAGE_READONLY_EXEC 105 #define __S110 PAGE_SHARED_EXEC 106 #define __S111 PAGE_SHARED_EXEC 107 108 /* 109 * ZERO_PAGE is a global shared page that is always zero: used 110 * for zero-mapped memory areas etc.. 111 */ 112 extern struct page *empty_zero_page; 113 #define ZERO_PAGE(vaddr) (empty_zero_page) 114 115 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 116 117 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 118 119 #define pte_none(pte) (!pte_val(pte)) 120 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 121 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 122 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) 123 124 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 125 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 126 #define pte_unmap(pte) do { } while (0) 127 #define pte_unmap_nested(pte) do { } while (0) 128 129 /* 130 * The following only work if pte_present(). Undefined behaviour otherwise. 131 */ 132 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) 133 #define pte_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) 134 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF)) 135 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL)) 136 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE)) 137 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 138 139 #define pte_valid_user(pte) \ 140 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 141 142 static inline pte_t pte_wrprotect(pte_t pte) 143 { 144 pte_val(pte) &= ~PTE_WRITE; 145 return pte; 146 } 147 148 static inline pte_t pte_mkwrite(pte_t pte) 149 { 150 pte_val(pte) |= PTE_WRITE; 151 return pte; 152 } 153 154 static inline pte_t pte_mkclean(pte_t pte) 155 { 156 pte_val(pte) &= ~PTE_DIRTY; 157 return pte; 158 } 159 160 static inline pte_t pte_mkdirty(pte_t pte) 161 { 162 pte_val(pte) |= PTE_DIRTY; 163 return pte; 164 } 165 166 static inline pte_t pte_mkold(pte_t pte) 167 { 168 pte_val(pte) &= ~PTE_AF; 169 return pte; 170 } 171 172 static inline pte_t pte_mkyoung(pte_t pte) 173 { 174 pte_val(pte) |= PTE_AF; 175 return pte; 176 } 177 178 static inline pte_t pte_mkspecial(pte_t pte) 179 { 180 pte_val(pte) |= PTE_SPECIAL; 181 return pte; 182 } 183 184 static inline void set_pte(pte_t *ptep, pte_t pte) 185 { 186 *ptep = pte; 187 } 188 189 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 190 191 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 192 pte_t *ptep, pte_t pte) 193 { 194 if (pte_valid_user(pte)) { 195 if (!pte_special(pte) && pte_exec(pte)) 196 __sync_icache_dcache(pte, addr); 197 if (pte_dirty(pte) && pte_write(pte)) 198 pte_val(pte) &= ~PTE_RDONLY; 199 else 200 pte_val(pte) |= PTE_RDONLY; 201 } 202 203 set_pte(ptep, pte); 204 } 205 206 /* 207 * Huge pte definitions. 208 */ 209 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) 210 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 211 212 /* 213 * Hugetlb definitions. 214 */ 215 #define HUGE_MAX_HSTATE 2 216 #define HPAGE_SHIFT PMD_SHIFT 217 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 218 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 219 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 220 221 #define __HAVE_ARCH_PTE_SPECIAL 222 223 static inline pte_t pmd_pte(pmd_t pmd) 224 { 225 return __pte(pmd_val(pmd)); 226 } 227 228 static inline pmd_t pte_pmd(pte_t pte) 229 { 230 return __pmd(pte_val(pte)); 231 } 232 233 /* 234 * THP definitions. 235 */ 236 237 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 238 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) 239 #define pmd_trans_splitting(pmd) pte_special(pmd_pte(pmd)) 240 #endif 241 242 #define pmd_young(pmd) pte_young(pmd_pte(pmd)) 243 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) 244 #define pmd_mksplitting(pmd) pte_pmd(pte_mkspecial(pmd_pte(pmd))) 245 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) 246 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) 247 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) 248 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) 249 #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) &= ~PMD_TYPE_MASK)) 250 251 #define __HAVE_ARCH_PMD_WRITE 252 #define pmd_write(pmd) pte_write(pmd_pte(pmd)) 253 254 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 255 256 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 257 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 258 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 259 260 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 261 #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 262 263 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) 264 265 static inline int has_transparent_hugepage(void) 266 { 267 return 1; 268 } 269 270 #define __pgprot_modify(prot,mask,bits) \ 271 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 272 273 /* 274 * Mark the prot value as uncacheable and unbufferable. 275 */ 276 #define pgprot_noncached(prot) \ 277 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) 278 #define pgprot_writecombine(prot) \ 279 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) 280 #define __HAVE_PHYS_MEM_ACCESS_PROT 281 struct file; 282 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 283 unsigned long size, pgprot_t vma_prot); 284 285 #define pmd_none(pmd) (!pmd_val(pmd)) 286 #define pmd_present(pmd) (pmd_val(pmd)) 287 288 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 289 290 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 291 PMD_TYPE_TABLE) 292 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 293 PMD_TYPE_SECT) 294 295 #ifdef ARM64_64K_PAGES 296 #define pud_sect(pud) (0) 297 #else 298 #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 299 PUD_TYPE_SECT) 300 #endif 301 302 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 303 { 304 *pmdp = pmd; 305 dsb(ishst); 306 } 307 308 static inline void pmd_clear(pmd_t *pmdp) 309 { 310 set_pmd(pmdp, __pmd(0)); 311 } 312 313 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 314 { 315 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 316 } 317 318 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 319 320 /* 321 * Conversion functions: convert a page and protection to a page entry, 322 * and a page entry and page directory to the page they refer to. 323 */ 324 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 325 326 #ifndef CONFIG_ARM64_64K_PAGES 327 328 #define pud_none(pud) (!pud_val(pud)) 329 #define pud_bad(pud) (!(pud_val(pud) & 2)) 330 #define pud_present(pud) (pud_val(pud)) 331 332 static inline void set_pud(pud_t *pudp, pud_t pud) 333 { 334 *pudp = pud; 335 dsb(ishst); 336 } 337 338 static inline void pud_clear(pud_t *pudp) 339 { 340 set_pud(pudp, __pud(0)); 341 } 342 343 static inline pmd_t *pud_page_vaddr(pud_t pud) 344 { 345 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 346 } 347 348 #endif /* CONFIG_ARM64_64K_PAGES */ 349 350 /* to find an entry in a page-table-directory */ 351 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 352 353 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 354 355 /* to find an entry in a kernel page-table-directory */ 356 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 357 358 /* Find an entry in the second-level page table.. */ 359 #ifndef CONFIG_ARM64_64K_PAGES 360 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 361 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 362 { 363 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 364 } 365 #endif 366 367 /* Find an entry in the third-level page table.. */ 368 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 369 370 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 371 { 372 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 373 PTE_PROT_NONE | PTE_VALID | PTE_WRITE; 374 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 375 return pte; 376 } 377 378 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 379 { 380 return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); 381 } 382 383 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 384 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 385 386 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) 387 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) 388 389 /* 390 * Encode and decode a swap entry: 391 * bits 0-1: present (must be zero) 392 * bit 2: PTE_FILE 393 * bits 3-8: swap type 394 * bits 9-57: swap offset 395 */ 396 #define __SWP_TYPE_SHIFT 3 397 #define __SWP_TYPE_BITS 6 398 #define __SWP_OFFSET_BITS 49 399 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 400 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 401 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) 402 403 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 404 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) 405 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 406 407 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 408 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 409 410 /* 411 * Ensure that there are not more swap files than can be encoded in the kernel 412 * PTEs. 413 */ 414 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 415 416 /* 417 * Encode and decode a file entry: 418 * bits 0-1: present (must be zero) 419 * bit 2: PTE_FILE 420 * bits 3-57: file offset / PAGE_SIZE 421 */ 422 #define pte_file(pte) (pte_val(pte) & PTE_FILE) 423 #define pte_to_pgoff(x) (pte_val(x) >> 3) 424 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) 425 426 #define PTE_FILE_MAX_BITS 55 427 428 extern int kern_addr_valid(unsigned long addr); 429 430 #include <asm-generic/pgtable.h> 431 432 #define pgtable_cache_init() do { } while (0) 433 434 #endif /* !__ASSEMBLY__ */ 435 436 #endif /* __ASM_PGTABLE_H */ 437