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/bug.h> 20 #include <asm/proc-fns.h> 21 22 #include <asm/memory.h> 23 #include <asm/pgtable-hwdef.h> 24 #include <asm/pgtable-prot.h> 25 26 /* 27 * VMALLOC and SPARSEMEM_VMEMMAP ranges. 28 * 29 * VMEMAP_SIZE: allows the whole linear region to be covered by a struct page array 30 * (rounded up to PUD_SIZE). 31 * VMALLOC_START: beginning of the kernel vmalloc space 32 * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space, 33 * fixed mappings and modules 34 */ 35 #define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE) 36 37 #define VMALLOC_START (MODULES_END) 38 #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) 39 40 #define VMEMMAP_START (VMALLOC_END + SZ_64K) 41 #define vmemmap ((struct page *)VMEMMAP_START - \ 42 SECTION_ALIGN_DOWN(memstart_addr >> PAGE_SHIFT)) 43 44 #define FIRST_USER_ADDRESS 0UL 45 46 #ifndef __ASSEMBLY__ 47 48 #include <asm/fixmap.h> 49 #include <linux/mmdebug.h> 50 51 extern void __pte_error(const char *file, int line, unsigned long val); 52 extern void __pmd_error(const char *file, int line, unsigned long val); 53 extern void __pud_error(const char *file, int line, unsigned long val); 54 extern void __pgd_error(const char *file, int line, unsigned long val); 55 56 /* 57 * ZERO_PAGE is a global shared page that is always zero: used 58 * for zero-mapped memory areas etc.. 59 */ 60 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 61 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) 62 63 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 64 65 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 66 67 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 68 69 #define pte_none(pte) (!pte_val(pte)) 70 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 71 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 72 73 /* 74 * The following only work if pte_present(). Undefined behaviour otherwise. 75 */ 76 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) 77 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF)) 78 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL)) 79 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE)) 80 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 81 #define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT)) 82 #define pte_user(pte) (!!(pte_val(pte) & PTE_USER)) 83 84 #ifdef CONFIG_ARM64_HW_AFDBM 85 #define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY)) 86 #else 87 #define pte_hw_dirty(pte) (0) 88 #endif 89 #define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) 90 #define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte)) 91 92 #define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID)) 93 #define pte_valid_not_user(pte) \ 94 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID) 95 #define pte_valid_young(pte) \ 96 ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF)) 97 98 /* 99 * Could the pte be present in the TLB? We must check mm_tlb_flush_pending 100 * so that we don't erroneously return false for pages that have been 101 * remapped as PROT_NONE but are yet to be flushed from the TLB. 102 */ 103 #define pte_accessible(mm, pte) \ 104 (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte)) 105 106 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) 107 { 108 pte_val(pte) &= ~pgprot_val(prot); 109 return pte; 110 } 111 112 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) 113 { 114 pte_val(pte) |= pgprot_val(prot); 115 return pte; 116 } 117 118 static inline pte_t pte_wrprotect(pte_t pte) 119 { 120 return clear_pte_bit(pte, __pgprot(PTE_WRITE)); 121 } 122 123 static inline pte_t pte_mkwrite(pte_t pte) 124 { 125 return set_pte_bit(pte, __pgprot(PTE_WRITE)); 126 } 127 128 static inline pte_t pte_mkclean(pte_t pte) 129 { 130 return clear_pte_bit(pte, __pgprot(PTE_DIRTY)); 131 } 132 133 static inline pte_t pte_mkdirty(pte_t pte) 134 { 135 return set_pte_bit(pte, __pgprot(PTE_DIRTY)); 136 } 137 138 static inline pte_t pte_mkold(pte_t pte) 139 { 140 return clear_pte_bit(pte, __pgprot(PTE_AF)); 141 } 142 143 static inline pte_t pte_mkyoung(pte_t pte) 144 { 145 return set_pte_bit(pte, __pgprot(PTE_AF)); 146 } 147 148 static inline pte_t pte_mkspecial(pte_t pte) 149 { 150 return set_pte_bit(pte, __pgprot(PTE_SPECIAL)); 151 } 152 153 static inline pte_t pte_mkcont(pte_t pte) 154 { 155 pte = set_pte_bit(pte, __pgprot(PTE_CONT)); 156 return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE)); 157 } 158 159 static inline pte_t pte_mknoncont(pte_t pte) 160 { 161 return clear_pte_bit(pte, __pgprot(PTE_CONT)); 162 } 163 164 static inline pmd_t pmd_mkcont(pmd_t pmd) 165 { 166 return __pmd(pmd_val(pmd) | PMD_SECT_CONT); 167 } 168 169 static inline void set_pte(pte_t *ptep, pte_t pte) 170 { 171 *ptep = pte; 172 173 /* 174 * Only if the new pte is valid and kernel, otherwise TLB maintenance 175 * or update_mmu_cache() have the necessary barriers. 176 */ 177 if (pte_valid_not_user(pte)) { 178 dsb(ishst); 179 isb(); 180 } 181 } 182 183 struct mm_struct; 184 struct vm_area_struct; 185 186 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 187 188 /* 189 * PTE bits configuration in the presence of hardware Dirty Bit Management 190 * (PTE_WRITE == PTE_DBM): 191 * 192 * Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw) 193 * 0 0 | 1 0 0 194 * 0 1 | 1 1 0 195 * 1 0 | 1 0 1 196 * 1 1 | 0 1 x 197 * 198 * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via 199 * the page fault mechanism. Checking the dirty status of a pte becomes: 200 * 201 * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY) 202 */ 203 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 204 pte_t *ptep, pte_t pte) 205 { 206 if (pte_present(pte)) { 207 if (pte_sw_dirty(pte) && pte_write(pte)) 208 pte_val(pte) &= ~PTE_RDONLY; 209 else 210 pte_val(pte) |= PTE_RDONLY; 211 if (pte_user(pte) && pte_exec(pte) && !pte_special(pte)) 212 __sync_icache_dcache(pte, addr); 213 } 214 215 /* 216 * If the existing pte is valid, check for potential race with 217 * hardware updates of the pte (ptep_set_access_flags safely changes 218 * valid ptes without going through an invalid entry). 219 */ 220 if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM) && 221 pte_valid(*ptep) && pte_valid(pte)) { 222 VM_WARN_ONCE(!pte_young(pte), 223 "%s: racy access flag clearing: 0x%016llx -> 0x%016llx", 224 __func__, pte_val(*ptep), pte_val(pte)); 225 VM_WARN_ONCE(pte_write(*ptep) && !pte_dirty(pte), 226 "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx", 227 __func__, pte_val(*ptep), pte_val(pte)); 228 } 229 230 set_pte(ptep, pte); 231 } 232 233 /* 234 * Huge pte definitions. 235 */ 236 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) 237 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 238 239 /* 240 * Hugetlb definitions. 241 */ 242 #define HUGE_MAX_HSTATE 4 243 #define HPAGE_SHIFT PMD_SHIFT 244 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 245 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 246 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 247 248 #define __HAVE_ARCH_PTE_SPECIAL 249 250 static inline pte_t pud_pte(pud_t pud) 251 { 252 return __pte(pud_val(pud)); 253 } 254 255 static inline pmd_t pud_pmd(pud_t pud) 256 { 257 return __pmd(pud_val(pud)); 258 } 259 260 static inline pte_t pmd_pte(pmd_t pmd) 261 { 262 return __pte(pmd_val(pmd)); 263 } 264 265 static inline pmd_t pte_pmd(pte_t pte) 266 { 267 return __pmd(pte_val(pte)); 268 } 269 270 static inline pgprot_t mk_sect_prot(pgprot_t prot) 271 { 272 return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT); 273 } 274 275 /* 276 * THP definitions. 277 */ 278 279 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 280 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) 281 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 282 283 #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) 284 #define pmd_young(pmd) pte_young(pmd_pte(pmd)) 285 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) 286 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) 287 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) 288 #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) 289 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) 290 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) 291 #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_TYPE_MASK)) 292 293 #define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd)) 294 295 #define __HAVE_ARCH_PMD_WRITE 296 #define pmd_write(pmd) pte_write(pmd_pte(pmd)) 297 298 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 299 300 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 301 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 302 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 303 304 #define pud_write(pud) pte_write(pud_pte(pud)) 305 #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 306 307 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) 308 309 static inline int has_transparent_hugepage(void) 310 { 311 return 1; 312 } 313 314 #define __pgprot_modify(prot,mask,bits) \ 315 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 316 317 /* 318 * Mark the prot value as uncacheable and unbufferable. 319 */ 320 #define pgprot_noncached(prot) \ 321 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) 322 #define pgprot_writecombine(prot) \ 323 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) 324 #define pgprot_device(prot) \ 325 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN) 326 #define __HAVE_PHYS_MEM_ACCESS_PROT 327 struct file; 328 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 329 unsigned long size, pgprot_t vma_prot); 330 331 #define pmd_none(pmd) (!pmd_val(pmd)) 332 #define pmd_present(pmd) (pmd_val(pmd)) 333 334 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 335 336 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 337 PMD_TYPE_TABLE) 338 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 339 PMD_TYPE_SECT) 340 341 #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 342 #define pud_sect(pud) (0) 343 #define pud_table(pud) (1) 344 #else 345 #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 346 PUD_TYPE_SECT) 347 #define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 348 PUD_TYPE_TABLE) 349 #endif 350 351 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 352 { 353 *pmdp = pmd; 354 dsb(ishst); 355 isb(); 356 } 357 358 static inline void pmd_clear(pmd_t *pmdp) 359 { 360 set_pmd(pmdp, __pmd(0)); 361 } 362 363 static inline phys_addr_t pmd_page_paddr(pmd_t pmd) 364 { 365 return pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK; 366 } 367 368 /* Find an entry in the third-level page table. */ 369 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 370 371 #define pte_offset_phys(dir,addr) (pmd_page_paddr(*(dir)) + pte_index(addr) * sizeof(pte_t)) 372 #define pte_offset_kernel(dir,addr) ((pte_t *)__va(pte_offset_phys((dir), (addr)))) 373 374 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 375 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 376 #define pte_unmap(pte) do { } while (0) 377 #define pte_unmap_nested(pte) do { } while (0) 378 379 #define pte_set_fixmap(addr) ((pte_t *)set_fixmap_offset(FIX_PTE, addr)) 380 #define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr)) 381 #define pte_clear_fixmap() clear_fixmap(FIX_PTE) 382 383 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 384 385 /* use ONLY for statically allocated translation tables */ 386 #define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr)))) 387 388 /* 389 * Conversion functions: convert a page and protection to a page entry, 390 * and a page entry and page directory to the page they refer to. 391 */ 392 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 393 394 #if CONFIG_PGTABLE_LEVELS > 2 395 396 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 397 398 #define pud_none(pud) (!pud_val(pud)) 399 #define pud_bad(pud) (!(pud_val(pud) & 2)) 400 #define pud_present(pud) (pud_val(pud)) 401 402 static inline void set_pud(pud_t *pudp, pud_t pud) 403 { 404 *pudp = pud; 405 dsb(ishst); 406 isb(); 407 } 408 409 static inline void pud_clear(pud_t *pudp) 410 { 411 set_pud(pudp, __pud(0)); 412 } 413 414 static inline phys_addr_t pud_page_paddr(pud_t pud) 415 { 416 return pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK; 417 } 418 419 /* Find an entry in the second-level page table. */ 420 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 421 422 #define pmd_offset_phys(dir, addr) (pud_page_paddr(*(dir)) + pmd_index(addr) * sizeof(pmd_t)) 423 #define pmd_offset(dir, addr) ((pmd_t *)__va(pmd_offset_phys((dir), (addr)))) 424 425 #define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr)) 426 #define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr)) 427 #define pmd_clear_fixmap() clear_fixmap(FIX_PMD) 428 429 #define pud_page(pud) pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK)) 430 431 /* use ONLY for statically allocated translation tables */ 432 #define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr)))) 433 434 #else 435 436 #define pud_page_paddr(pud) ({ BUILD_BUG(); 0; }) 437 438 /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */ 439 #define pmd_set_fixmap(addr) NULL 440 #define pmd_set_fixmap_offset(pudp, addr) ((pmd_t *)pudp) 441 #define pmd_clear_fixmap() 442 443 #define pmd_offset_kimg(dir,addr) ((pmd_t *)dir) 444 445 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 446 447 #if CONFIG_PGTABLE_LEVELS > 3 448 449 #define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud)) 450 451 #define pgd_none(pgd) (!pgd_val(pgd)) 452 #define pgd_bad(pgd) (!(pgd_val(pgd) & 2)) 453 #define pgd_present(pgd) (pgd_val(pgd)) 454 455 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) 456 { 457 *pgdp = pgd; 458 dsb(ishst); 459 } 460 461 static inline void pgd_clear(pgd_t *pgdp) 462 { 463 set_pgd(pgdp, __pgd(0)); 464 } 465 466 static inline phys_addr_t pgd_page_paddr(pgd_t pgd) 467 { 468 return pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK; 469 } 470 471 /* Find an entry in the frst-level page table. */ 472 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) 473 474 #define pud_offset_phys(dir, addr) (pgd_page_paddr(*(dir)) + pud_index(addr) * sizeof(pud_t)) 475 #define pud_offset(dir, addr) ((pud_t *)__va(pud_offset_phys((dir), (addr)))) 476 477 #define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr)) 478 #define pud_set_fixmap_offset(pgd, addr) pud_set_fixmap(pud_offset_phys(pgd, addr)) 479 #define pud_clear_fixmap() clear_fixmap(FIX_PUD) 480 481 #define pgd_page(pgd) pfn_to_page(__phys_to_pfn(pgd_val(pgd) & PHYS_MASK)) 482 483 /* use ONLY for statically allocated translation tables */ 484 #define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr)))) 485 486 #else 487 488 #define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;}) 489 490 /* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */ 491 #define pud_set_fixmap(addr) NULL 492 #define pud_set_fixmap_offset(pgdp, addr) ((pud_t *)pgdp) 493 #define pud_clear_fixmap() 494 495 #define pud_offset_kimg(dir,addr) ((pud_t *)dir) 496 497 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 498 499 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 500 501 /* to find an entry in a page-table-directory */ 502 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 503 504 #define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr)) 505 506 #define pgd_offset(mm, addr) (pgd_offset_raw((mm)->pgd, (addr))) 507 508 /* to find an entry in a kernel page-table-directory */ 509 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 510 511 #define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr)) 512 #define pgd_clear_fixmap() clear_fixmap(FIX_PGD) 513 514 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 515 { 516 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 517 PTE_PROT_NONE | PTE_VALID | PTE_WRITE; 518 /* preserve the hardware dirty information */ 519 if (pte_hw_dirty(pte)) 520 pte = pte_mkdirty(pte); 521 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 522 return pte; 523 } 524 525 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 526 { 527 return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); 528 } 529 530 #ifdef CONFIG_ARM64_HW_AFDBM 531 /* 532 * Atomic pte/pmd modifications. 533 */ 534 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 535 static inline int __ptep_test_and_clear_young(pte_t *ptep) 536 { 537 pteval_t pteval; 538 unsigned int tmp, res; 539 540 asm volatile("// __ptep_test_and_clear_young\n" 541 " prfm pstl1strm, %2\n" 542 "1: ldxr %0, %2\n" 543 " ubfx %w3, %w0, %5, #1 // extract PTE_AF (young)\n" 544 " and %0, %0, %4 // clear PTE_AF\n" 545 " stxr %w1, %0, %2\n" 546 " cbnz %w1, 1b\n" 547 : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)), "=&r" (res) 548 : "L" (~PTE_AF), "I" (ilog2(PTE_AF))); 549 550 return res; 551 } 552 553 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, 554 unsigned long address, 555 pte_t *ptep) 556 { 557 return __ptep_test_and_clear_young(ptep); 558 } 559 560 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 561 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 562 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, 563 unsigned long address, 564 pmd_t *pmdp) 565 { 566 return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); 567 } 568 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 569 570 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 571 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 572 unsigned long address, pte_t *ptep) 573 { 574 pteval_t old_pteval; 575 unsigned int tmp; 576 577 asm volatile("// ptep_get_and_clear\n" 578 " prfm pstl1strm, %2\n" 579 "1: ldxr %0, %2\n" 580 " stxr %w1, xzr, %2\n" 581 " cbnz %w1, 1b\n" 582 : "=&r" (old_pteval), "=&r" (tmp), "+Q" (pte_val(*ptep))); 583 584 return __pte(old_pteval); 585 } 586 587 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 588 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR 589 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, 590 unsigned long address, pmd_t *pmdp) 591 { 592 return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp)); 593 } 594 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 595 596 /* 597 * ptep_set_wrprotect - mark read-only while trasferring potential hardware 598 * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit. 599 */ 600 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 601 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) 602 { 603 pteval_t pteval; 604 unsigned long tmp; 605 606 asm volatile("// ptep_set_wrprotect\n" 607 " prfm pstl1strm, %2\n" 608 "1: ldxr %0, %2\n" 609 " tst %0, %4 // check for hw dirty (!PTE_RDONLY)\n" 610 " csel %1, %3, xzr, eq // set PTE_DIRTY|PTE_RDONLY if dirty\n" 611 " orr %0, %0, %1 // if !dirty, PTE_RDONLY is already set\n" 612 " and %0, %0, %5 // clear PTE_WRITE/PTE_DBM\n" 613 " stxr %w1, %0, %2\n" 614 " cbnz %w1, 1b\n" 615 : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)) 616 : "r" (PTE_DIRTY|PTE_RDONLY), "L" (PTE_RDONLY), "L" (~PTE_WRITE) 617 : "cc"); 618 } 619 620 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 621 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 622 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 623 unsigned long address, pmd_t *pmdp) 624 { 625 ptep_set_wrprotect(mm, address, (pte_t *)pmdp); 626 } 627 #endif 628 #endif /* CONFIG_ARM64_HW_AFDBM */ 629 630 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 631 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 632 633 /* 634 * Encode and decode a swap entry: 635 * bits 0-1: present (must be zero) 636 * bits 2-7: swap type 637 * bits 8-57: swap offset 638 * bit 58: PTE_PROT_NONE (must be zero) 639 */ 640 #define __SWP_TYPE_SHIFT 2 641 #define __SWP_TYPE_BITS 6 642 #define __SWP_OFFSET_BITS 50 643 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 644 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 645 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) 646 647 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 648 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) 649 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 650 651 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 652 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 653 654 /* 655 * Ensure that there are not more swap files than can be encoded in the kernel 656 * PTEs. 657 */ 658 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 659 660 extern int kern_addr_valid(unsigned long addr); 661 662 #include <asm-generic/pgtable.h> 663 664 void pgd_cache_init(void); 665 #define pgtable_cache_init pgd_cache_init 666 667 /* 668 * On AArch64, the cache coherency is handled via the set_pte_at() function. 669 */ 670 static inline void update_mmu_cache(struct vm_area_struct *vma, 671 unsigned long addr, pte_t *ptep) 672 { 673 /* 674 * We don't do anything here, so there's a very small chance of 675 * us retaking a user fault which we just fixed up. The alternative 676 * is doing a dsb(ishst), but that penalises the fastpath. 677 */ 678 } 679 680 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) 681 682 #define kc_vaddr_to_offset(v) ((v) & ~VA_START) 683 #define kc_offset_to_vaddr(o) ((o) | VA_START) 684 685 #endif /* !__ASSEMBLY__ */ 686 687 #endif /* __ASM_PGTABLE_H */ 688