1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 * 5 * Derived from MIPS: 6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle 7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. 8 */ 9 #ifndef _ASM_PGTABLE_H 10 #define _ASM_PGTABLE_H 11 12 #include <linux/compiler.h> 13 #include <asm/addrspace.h> 14 #include <asm/pgtable-bits.h> 15 16 #if CONFIG_PGTABLE_LEVELS == 2 17 #include <asm-generic/pgtable-nopmd.h> 18 #elif CONFIG_PGTABLE_LEVELS == 3 19 #include <asm-generic/pgtable-nopud.h> 20 #else 21 #include <asm-generic/pgtable-nop4d.h> 22 #endif 23 24 #if CONFIG_PGTABLE_LEVELS == 2 25 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 26 #elif CONFIG_PGTABLE_LEVELS == 3 27 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 28 #define PMD_SIZE (1UL << PMD_SHIFT) 29 #define PMD_MASK (~(PMD_SIZE-1)) 30 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) 31 #elif CONFIG_PGTABLE_LEVELS == 4 32 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) 33 #define PMD_SIZE (1UL << PMD_SHIFT) 34 #define PMD_MASK (~(PMD_SIZE-1)) 35 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) 36 #define PUD_SIZE (1UL << PUD_SHIFT) 37 #define PUD_MASK (~(PUD_SIZE-1)) 38 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - 3)) 39 #endif 40 41 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 42 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 43 44 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3)) 45 46 #define PTRS_PER_PGD (PAGE_SIZE >> 3) 47 #if CONFIG_PGTABLE_LEVELS > 3 48 #define PTRS_PER_PUD (PAGE_SIZE >> 3) 49 #endif 50 #if CONFIG_PGTABLE_LEVELS > 2 51 #define PTRS_PER_PMD (PAGE_SIZE >> 3) 52 #endif 53 #define PTRS_PER_PTE (PAGE_SIZE >> 3) 54 55 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 56 57 #ifndef __ASSEMBLY__ 58 59 #include <linux/mm_types.h> 60 #include <linux/mmzone.h> 61 #include <asm/fixmap.h> 62 #include <asm/io.h> 63 64 struct mm_struct; 65 struct vm_area_struct; 66 67 /* 68 * ZERO_PAGE is a global shared page that is always zero; used 69 * for zero-mapped memory areas etc.. 70 */ 71 72 extern unsigned long empty_zero_page; 73 extern unsigned long zero_page_mask; 74 75 #define ZERO_PAGE(vaddr) \ 76 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 77 #define __HAVE_COLOR_ZERO_PAGE 78 79 /* 80 * TLB refill handlers may also map the vmalloc area into xkvrange. 81 * Avoid the first couple of pages so NULL pointer dereferences will 82 * still reliably trap. 83 */ 84 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 85 #define MODULES_END (MODULES_VADDR + SZ_256M) 86 87 #define VMALLOC_START MODULES_END 88 #define VMALLOC_END \ 89 (vm_map_base + \ 90 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE) 91 92 #define pte_ERROR(e) \ 93 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 94 #ifndef __PAGETABLE_PMD_FOLDED 95 #define pmd_ERROR(e) \ 96 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 97 #endif 98 #ifndef __PAGETABLE_PUD_FOLDED 99 #define pud_ERROR(e) \ 100 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 101 #endif 102 #define pgd_ERROR(e) \ 103 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 104 105 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 106 107 #ifndef __PAGETABLE_PUD_FOLDED 108 109 typedef struct { unsigned long pud; } pud_t; 110 #define pud_val(x) ((x).pud) 111 #define __pud(x) ((pud_t) { (x) }) 112 113 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 114 115 /* 116 * Empty pgd/p4d entries point to the invalid_pud_table. 117 */ 118 static inline int p4d_none(p4d_t p4d) 119 { 120 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 121 } 122 123 static inline int p4d_bad(p4d_t p4d) 124 { 125 return p4d_val(p4d) & ~PAGE_MASK; 126 } 127 128 static inline int p4d_present(p4d_t p4d) 129 { 130 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 131 } 132 133 static inline void p4d_clear(p4d_t *p4dp) 134 { 135 p4d_val(*p4dp) = (unsigned long)invalid_pud_table; 136 } 137 138 static inline pud_t *p4d_pgtable(p4d_t p4d) 139 { 140 return (pud_t *)p4d_val(p4d); 141 } 142 143 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 144 { 145 *p4d = p4dval; 146 } 147 148 #define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d)) 149 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 150 151 #endif 152 153 #ifndef __PAGETABLE_PMD_FOLDED 154 155 typedef struct { unsigned long pmd; } pmd_t; 156 #define pmd_val(x) ((x).pmd) 157 #define __pmd(x) ((pmd_t) { (x) }) 158 159 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 160 161 /* 162 * Empty pud entries point to the invalid_pmd_table. 163 */ 164 static inline int pud_none(pud_t pud) 165 { 166 return pud_val(pud) == (unsigned long)invalid_pmd_table; 167 } 168 169 static inline int pud_bad(pud_t pud) 170 { 171 return pud_val(pud) & ~PAGE_MASK; 172 } 173 174 static inline int pud_present(pud_t pud) 175 { 176 return pud_val(pud) != (unsigned long)invalid_pmd_table; 177 } 178 179 static inline void pud_clear(pud_t *pudp) 180 { 181 pud_val(*pudp) = ((unsigned long)invalid_pmd_table); 182 } 183 184 static inline pmd_t *pud_pgtable(pud_t pud) 185 { 186 return (pmd_t *)pud_val(pud); 187 } 188 189 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0) 190 191 #define pud_phys(pud) virt_to_phys((void *)pud_val(pud)) 192 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 193 194 #endif 195 196 /* 197 * Empty pmd entries point to the invalid_pte_table. 198 */ 199 static inline int pmd_none(pmd_t pmd) 200 { 201 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 202 } 203 204 static inline int pmd_bad(pmd_t pmd) 205 { 206 return (pmd_val(pmd) & ~PAGE_MASK); 207 } 208 209 static inline int pmd_present(pmd_t pmd) 210 { 211 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 212 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE)); 213 214 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 215 } 216 217 static inline void pmd_clear(pmd_t *pmdp) 218 { 219 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table); 220 } 221 222 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0) 223 224 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 225 226 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 227 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 228 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 229 230 #define pmd_page_vaddr(pmd) pmd_val(pmd) 231 232 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 233 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 234 235 #define pte_page(x) pfn_to_page(pte_pfn(x)) 236 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT)) 237 #define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 238 #define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 239 240 /* 241 * Initialize a new pgd / pmd table with invalid pointers. 242 */ 243 extern void pgd_init(unsigned long page); 244 extern void pud_init(unsigned long page, unsigned long pagetable); 245 extern void pmd_init(unsigned long page, unsigned long pagetable); 246 247 /* 248 * Non-present pages: high 40 bits are offset, next 8 bits type, 249 * low 16 bits zero. 250 */ 251 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 252 { pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } 253 254 #define __swp_type(x) (((x).val >> 16) & 0xff) 255 #define __swp_offset(x) ((x).val >> 24) 256 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 257 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 258 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 259 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 260 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) 261 262 extern void paging_init(void); 263 264 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 265 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 266 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 267 268 static inline void set_pte(pte_t *ptep, pte_t pteval) 269 { 270 *ptep = pteval; 271 if (pte_val(pteval) & _PAGE_GLOBAL) { 272 pte_t *buddy = ptep_buddy(ptep); 273 /* 274 * Make sure the buddy is global too (if it's !none, 275 * it better already be global) 276 */ 277 #ifdef CONFIG_SMP 278 /* 279 * For SMP, multiple CPUs can race, so we need to do 280 * this atomically. 281 */ 282 unsigned long page_global = _PAGE_GLOBAL; 283 unsigned long tmp; 284 285 __asm__ __volatile__ ( 286 "1:" __LL "%[tmp], %[buddy] \n" 287 " bnez %[tmp], 2f \n" 288 " or %[tmp], %[tmp], %[global] \n" 289 __SC "%[tmp], %[buddy] \n" 290 " beqz %[tmp], 1b \n" 291 " nop \n" 292 "2: \n" 293 __WEAK_LLSC_MB 294 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) 295 : [global] "r" (page_global)); 296 #else /* !CONFIG_SMP */ 297 if (pte_none(*buddy)) 298 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 299 #endif /* CONFIG_SMP */ 300 } 301 } 302 303 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 304 pte_t *ptep, pte_t pteval) 305 { 306 set_pte(ptep, pteval); 307 } 308 309 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 310 { 311 /* Preserve global status for the pair */ 312 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 313 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 314 else 315 set_pte_at(mm, addr, ptep, __pte(0)); 316 } 317 318 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 319 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 320 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 321 322 extern pgd_t swapper_pg_dir[]; 323 extern pgd_t invalid_pg_dir[]; 324 325 /* 326 * The following only work if pte_present() is true. 327 * Undefined behaviour if not.. 328 */ 329 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 330 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 331 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 332 333 static inline pte_t pte_mkold(pte_t pte) 334 { 335 pte_val(pte) &= ~_PAGE_ACCESSED; 336 return pte; 337 } 338 339 static inline pte_t pte_mkyoung(pte_t pte) 340 { 341 pte_val(pte) |= _PAGE_ACCESSED; 342 return pte; 343 } 344 345 static inline pte_t pte_mkclean(pte_t pte) 346 { 347 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 348 return pte; 349 } 350 351 static inline pte_t pte_mkdirty(pte_t pte) 352 { 353 pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED); 354 return pte; 355 } 356 357 static inline pte_t pte_mkwrite(pte_t pte) 358 { 359 pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY); 360 return pte; 361 } 362 363 static inline pte_t pte_wrprotect(pte_t pte) 364 { 365 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 366 return pte; 367 } 368 369 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 370 371 static inline pte_t pte_mkhuge(pte_t pte) 372 { 373 pte_val(pte) |= _PAGE_HUGE; 374 return pte; 375 } 376 377 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 378 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 379 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 380 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 381 382 #define pte_accessible pte_accessible 383 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 384 { 385 if (pte_val(a) & _PAGE_PRESENT) 386 return true; 387 388 if ((pte_val(a) & _PAGE_PROTNONE) && 389 atomic_read(&mm->tlb_flush_pending)) 390 return true; 391 392 return false; 393 } 394 395 /* 396 * Conversion functions: convert a page and protection to a page entry, 397 * and a page entry and page directory to the page they refer to. 398 */ 399 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 400 401 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 402 { 403 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 404 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 405 } 406 407 extern void __update_tlb(struct vm_area_struct *vma, 408 unsigned long address, pte_t *ptep); 409 410 static inline void update_mmu_cache(struct vm_area_struct *vma, 411 unsigned long address, pte_t *ptep) 412 { 413 __update_tlb(vma, address, ptep); 414 } 415 416 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 417 unsigned long address, pmd_t *pmdp) 418 { 419 __update_tlb(vma, address, (pte_t *)pmdp); 420 } 421 422 #define kern_addr_valid(addr) (1) 423 424 static inline unsigned long pmd_pfn(pmd_t pmd) 425 { 426 return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT; 427 } 428 429 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 430 431 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ 432 #define pmdp_establish generic_pmdp_establish 433 434 static inline int pmd_trans_huge(pmd_t pmd) 435 { 436 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); 437 } 438 439 static inline pmd_t pmd_mkhuge(pmd_t pmd) 440 { 441 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | 442 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); 443 pmd_val(pmd) |= _PAGE_HUGE; 444 445 return pmd; 446 } 447 448 #define pmd_write pmd_write 449 static inline int pmd_write(pmd_t pmd) 450 { 451 return !!(pmd_val(pmd) & _PAGE_WRITE); 452 } 453 454 static inline pmd_t pmd_mkwrite(pmd_t pmd) 455 { 456 pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY); 457 return pmd; 458 } 459 460 static inline pmd_t pmd_wrprotect(pmd_t pmd) 461 { 462 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 463 return pmd; 464 } 465 466 static inline int pmd_dirty(pmd_t pmd) 467 { 468 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 469 } 470 471 static inline pmd_t pmd_mkclean(pmd_t pmd) 472 { 473 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 474 return pmd; 475 } 476 477 static inline pmd_t pmd_mkdirty(pmd_t pmd) 478 { 479 pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED); 480 return pmd; 481 } 482 483 static inline int pmd_young(pmd_t pmd) 484 { 485 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 486 } 487 488 static inline pmd_t pmd_mkold(pmd_t pmd) 489 { 490 pmd_val(pmd) &= ~_PAGE_ACCESSED; 491 return pmd; 492 } 493 494 static inline pmd_t pmd_mkyoung(pmd_t pmd) 495 { 496 pmd_val(pmd) |= _PAGE_ACCESSED; 497 return pmd; 498 } 499 500 static inline struct page *pmd_page(pmd_t pmd) 501 { 502 if (pmd_trans_huge(pmd)) 503 return pfn_to_page(pmd_pfn(pmd)); 504 505 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 506 } 507 508 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 509 { 510 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | 511 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK); 512 return pmd; 513 } 514 515 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 516 { 517 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 518 519 return pmd; 520 } 521 522 /* 523 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 524 * different prototype. 525 */ 526 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 527 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 528 unsigned long address, pmd_t *pmdp) 529 { 530 pmd_t old = *pmdp; 531 532 pmd_clear(pmdp); 533 534 return old; 535 } 536 537 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 538 539 #ifdef CONFIG_NUMA_BALANCING 540 static inline long pte_protnone(pte_t pte) 541 { 542 return (pte_val(pte) & _PAGE_PROTNONE); 543 } 544 545 static inline long pmd_protnone(pmd_t pmd) 546 { 547 return (pmd_val(pmd) & _PAGE_PROTNONE); 548 } 549 #endif /* CONFIG_NUMA_BALANCING */ 550 551 /* 552 * We provide our own get_unmapped area to cope with the virtual aliasing 553 * constraints placed on us by the cache architecture. 554 */ 555 #define HAVE_ARCH_UNMAPPED_AREA 556 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 557 558 #endif /* !__ASSEMBLY__ */ 559 560 #endif /* _ASM_PGTABLE_H */ 561