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 #define PGD_ORDER 0 25 #define PUD_ORDER 0 26 #define PMD_ORDER 0 27 #define PTE_ORDER 0 28 29 #if CONFIG_PGTABLE_LEVELS == 2 30 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3)) 31 #elif CONFIG_PGTABLE_LEVELS == 3 32 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3)) 33 #define PMD_SIZE (1UL << PMD_SHIFT) 34 #define PMD_MASK (~(PMD_SIZE-1)) 35 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) 36 #elif CONFIG_PGTABLE_LEVELS == 4 37 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3)) 38 #define PMD_SIZE (1UL << PMD_SHIFT) 39 #define PMD_MASK (~(PMD_SIZE-1)) 40 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) 41 #define PUD_SIZE (1UL << PUD_SHIFT) 42 #define PUD_MASK (~(PUD_SIZE-1)) 43 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3)) 44 #endif 45 46 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 47 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 48 49 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT + PGD_ORDER - 3)) 50 51 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) >> 3) 52 #if CONFIG_PGTABLE_LEVELS > 3 53 #define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) >> 3) 54 #endif 55 #if CONFIG_PGTABLE_LEVELS > 2 56 #define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) >> 3) 57 #endif 58 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) >> 3) 59 60 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) 61 62 #ifndef __ASSEMBLY__ 63 64 #include <linux/mm_types.h> 65 #include <linux/mmzone.h> 66 #include <asm/fixmap.h> 67 #include <asm/io.h> 68 69 struct mm_struct; 70 struct vm_area_struct; 71 72 /* 73 * ZERO_PAGE is a global shared page that is always zero; used 74 * for zero-mapped memory areas etc.. 75 */ 76 77 extern unsigned long empty_zero_page; 78 extern unsigned long zero_page_mask; 79 80 #define ZERO_PAGE(vaddr) \ 81 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 82 #define __HAVE_COLOR_ZERO_PAGE 83 84 /* 85 * TLB refill handlers may also map the vmalloc area into xkvrange. 86 * Avoid the first couple of pages so NULL pointer dereferences will 87 * still reliably trap. 88 */ 89 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) 90 #define MODULES_END (MODULES_VADDR + SZ_256M) 91 92 #define VMALLOC_START MODULES_END 93 #define VMALLOC_END \ 94 (vm_map_base + \ 95 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE) 96 97 #define pte_ERROR(e) \ 98 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) 99 #ifndef __PAGETABLE_PMD_FOLDED 100 #define pmd_ERROR(e) \ 101 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 102 #endif 103 #ifndef __PAGETABLE_PUD_FOLDED 104 #define pud_ERROR(e) \ 105 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 106 #endif 107 #define pgd_ERROR(e) \ 108 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) 109 110 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 111 112 #ifndef __PAGETABLE_PUD_FOLDED 113 114 typedef struct { unsigned long pud; } pud_t; 115 #define pud_val(x) ((x).pud) 116 #define __pud(x) ((pud_t) { (x) }) 117 118 extern pud_t invalid_pud_table[PTRS_PER_PUD]; 119 120 /* 121 * Empty pgd/p4d entries point to the invalid_pud_table. 122 */ 123 static inline int p4d_none(p4d_t p4d) 124 { 125 return p4d_val(p4d) == (unsigned long)invalid_pud_table; 126 } 127 128 static inline int p4d_bad(p4d_t p4d) 129 { 130 return p4d_val(p4d) & ~PAGE_MASK; 131 } 132 133 static inline int p4d_present(p4d_t p4d) 134 { 135 return p4d_val(p4d) != (unsigned long)invalid_pud_table; 136 } 137 138 static inline void p4d_clear(p4d_t *p4dp) 139 { 140 p4d_val(*p4dp) = (unsigned long)invalid_pud_table; 141 } 142 143 static inline pud_t *p4d_pgtable(p4d_t p4d) 144 { 145 return (pud_t *)p4d_val(p4d); 146 } 147 148 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) 149 { 150 *p4d = p4dval; 151 } 152 153 #define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d)) 154 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) 155 156 #endif 157 158 #ifndef __PAGETABLE_PMD_FOLDED 159 160 typedef struct { unsigned long pmd; } pmd_t; 161 #define pmd_val(x) ((x).pmd) 162 #define __pmd(x) ((pmd_t) { (x) }) 163 164 extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; 165 166 /* 167 * Empty pud entries point to the invalid_pmd_table. 168 */ 169 static inline int pud_none(pud_t pud) 170 { 171 return pud_val(pud) == (unsigned long)invalid_pmd_table; 172 } 173 174 static inline int pud_bad(pud_t pud) 175 { 176 return pud_val(pud) & ~PAGE_MASK; 177 } 178 179 static inline int pud_present(pud_t pud) 180 { 181 return pud_val(pud) != (unsigned long)invalid_pmd_table; 182 } 183 184 static inline void pud_clear(pud_t *pudp) 185 { 186 pud_val(*pudp) = ((unsigned long)invalid_pmd_table); 187 } 188 189 static inline pmd_t *pud_pgtable(pud_t pud) 190 { 191 return (pmd_t *)pud_val(pud); 192 } 193 194 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0) 195 196 #define pud_phys(pud) virt_to_phys((void *)pud_val(pud)) 197 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) 198 199 #endif 200 201 /* 202 * Empty pmd entries point to the invalid_pte_table. 203 */ 204 static inline int pmd_none(pmd_t pmd) 205 { 206 return pmd_val(pmd) == (unsigned long)invalid_pte_table; 207 } 208 209 static inline int pmd_bad(pmd_t pmd) 210 { 211 return (pmd_val(pmd) & ~PAGE_MASK); 212 } 213 214 static inline int pmd_present(pmd_t pmd) 215 { 216 if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) 217 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE)); 218 219 return pmd_val(pmd) != (unsigned long)invalid_pte_table; 220 } 221 222 static inline void pmd_clear(pmd_t *pmdp) 223 { 224 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table); 225 } 226 227 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0) 228 229 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 230 231 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 232 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 233 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 234 235 #define pmd_page_vaddr(pmd) pmd_val(pmd) 236 237 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 238 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); 239 240 #define pte_page(x) pfn_to_page(pte_pfn(x)) 241 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT)) 242 #define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 243 #define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) 244 245 /* 246 * Initialize a new pgd / pmd table with invalid pointers. 247 */ 248 extern void pgd_init(unsigned long page); 249 extern void pud_init(unsigned long page, unsigned long pagetable); 250 extern void pmd_init(unsigned long page, unsigned long pagetable); 251 252 /* 253 * Non-present pages: high 40 bits are offset, next 8 bits type, 254 * low 16 bits zero. 255 */ 256 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 257 { pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } 258 259 #define __swp_type(x) (((x).val >> 16) & 0xff) 260 #define __swp_offset(x) ((x).val >> 24) 261 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) 262 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 263 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 264 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 265 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) 266 267 extern void paging_init(void); 268 269 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 270 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) 271 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 272 273 static inline void set_pte(pte_t *ptep, pte_t pteval) 274 { 275 *ptep = pteval; 276 if (pte_val(pteval) & _PAGE_GLOBAL) { 277 pte_t *buddy = ptep_buddy(ptep); 278 /* 279 * Make sure the buddy is global too (if it's !none, 280 * it better already be global) 281 */ 282 #ifdef CONFIG_SMP 283 /* 284 * For SMP, multiple CPUs can race, so we need to do 285 * this atomically. 286 */ 287 unsigned long page_global = _PAGE_GLOBAL; 288 unsigned long tmp; 289 290 __asm__ __volatile__ ( 291 "1:" __LL "%[tmp], %[buddy] \n" 292 " bnez %[tmp], 2f \n" 293 " or %[tmp], %[tmp], %[global] \n" 294 __SC "%[tmp], %[buddy] \n" 295 " beqz %[tmp], 1b \n" 296 " nop \n" 297 "2: \n" 298 __WEAK_LLSC_MB 299 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) 300 : [global] "r" (page_global)); 301 #else /* !CONFIG_SMP */ 302 if (pte_none(*buddy)) 303 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 304 #endif /* CONFIG_SMP */ 305 } 306 } 307 308 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 309 pte_t *ptep, pte_t pteval) 310 { 311 set_pte(ptep, pteval); 312 } 313 314 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 315 { 316 /* Preserve global status for the pair */ 317 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 318 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 319 else 320 set_pte_at(mm, addr, ptep, __pte(0)); 321 } 322 323 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 324 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 325 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 326 327 extern pgd_t swapper_pg_dir[]; 328 extern pgd_t invalid_pg_dir[]; 329 330 /* 331 * The following only work if pte_present() is true. 332 * Undefined behaviour if not.. 333 */ 334 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 335 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 336 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 337 338 static inline pte_t pte_mkold(pte_t pte) 339 { 340 pte_val(pte) &= ~_PAGE_ACCESSED; 341 return pte; 342 } 343 344 static inline pte_t pte_mkyoung(pte_t pte) 345 { 346 pte_val(pte) |= _PAGE_ACCESSED; 347 return pte; 348 } 349 350 static inline pte_t pte_mkclean(pte_t pte) 351 { 352 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); 353 return pte; 354 } 355 356 static inline pte_t pte_mkdirty(pte_t pte) 357 { 358 pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED); 359 return pte; 360 } 361 362 static inline pte_t pte_mkwrite(pte_t pte) 363 { 364 pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY); 365 return pte; 366 } 367 368 static inline pte_t pte_wrprotect(pte_t pte) 369 { 370 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 371 return pte; 372 } 373 374 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 375 376 static inline pte_t pte_mkhuge(pte_t pte) 377 { 378 pte_val(pte) |= _PAGE_HUGE; 379 return pte; 380 } 381 382 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) 383 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 384 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 385 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ 386 387 #define pte_accessible pte_accessible 388 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) 389 { 390 if (pte_val(a) & _PAGE_PRESENT) 391 return true; 392 393 if ((pte_val(a) & _PAGE_PROTNONE) && 394 atomic_read(&mm->tlb_flush_pending)) 395 return true; 396 397 return false; 398 } 399 400 /* 401 * Conversion functions: convert a page and protection to a page entry, 402 * and a page entry and page directory to the page they refer to. 403 */ 404 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 405 406 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 407 { 408 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 409 (pgprot_val(newprot) & ~_PAGE_CHG_MASK)); 410 } 411 412 extern void __update_tlb(struct vm_area_struct *vma, 413 unsigned long address, pte_t *ptep); 414 415 static inline void update_mmu_cache(struct vm_area_struct *vma, 416 unsigned long address, pte_t *ptep) 417 { 418 __update_tlb(vma, address, ptep); 419 } 420 421 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 422 unsigned long address, pmd_t *pmdp) 423 { 424 __update_tlb(vma, address, (pte_t *)pmdp); 425 } 426 427 #define kern_addr_valid(addr) (1) 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 unsigned long pmd_pfn(pmd_t pmd) 501 { 502 return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT; 503 } 504 505 static inline struct page *pmd_page(pmd_t pmd) 506 { 507 if (pmd_trans_huge(pmd)) 508 return pfn_to_page(pmd_pfn(pmd)); 509 510 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 511 } 512 513 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 514 { 515 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | 516 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK); 517 return pmd; 518 } 519 520 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 521 { 522 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); 523 524 return pmd; 525 } 526 527 /* 528 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 529 * different prototype. 530 */ 531 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 532 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 533 unsigned long address, pmd_t *pmdp) 534 { 535 pmd_t old = *pmdp; 536 537 pmd_clear(pmdp); 538 539 return old; 540 } 541 542 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 543 544 #ifdef CONFIG_NUMA_BALANCING 545 static inline long pte_protnone(pte_t pte) 546 { 547 return (pte_val(pte) & _PAGE_PROTNONE); 548 } 549 550 static inline long pmd_protnone(pmd_t pmd) 551 { 552 return (pmd_val(pmd) & _PAGE_PROTNONE); 553 } 554 #endif /* CONFIG_NUMA_BALANCING */ 555 556 /* 557 * We provide our own get_unmapped area to cope with the virtual aliasing 558 * constraints placed on us by the cache architecture. 559 */ 560 #define HAVE_ARCH_UNMAPPED_AREA 561 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 562 563 #endif /* !__ASSEMBLY__ */ 564 565 #endif /* _ASM_PGTABLE_H */ 566