1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
10 #define _ASM_PGTABLE_H
12 #include <linux/compiler.h>
13 #include <asm/addrspace.h>
14 #include <asm/pgtable-bits.h>
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>
21 #include <asm-generic/pgtable-nop4d.h>
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))
41 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
42 #define PGDIR_MASK (~(PGDIR_SIZE-1))
44 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3))
46 #define PTRS_PER_PGD (PAGE_SIZE >> 3)
47 #if CONFIG_PGTABLE_LEVELS > 3
48 #define PTRS_PER_PUD (PAGE_SIZE >> 3)
50 #if CONFIG_PGTABLE_LEVELS > 2
51 #define PTRS_PER_PMD (PAGE_SIZE >> 3)
53 #define PTRS_PER_PTE (PAGE_SIZE >> 3)
55 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
59 #include <linux/mm_types.h>
60 #include <linux/mmzone.h>
61 #include <asm/fixmap.h>
65 struct vm_area_struct;
68 * ZERO_PAGE is a global shared page that is always zero; used
69 * for zero-mapped memory areas etc..
72 extern unsigned long empty_zero_page;
73 extern unsigned long zero_page_mask;
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
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.
84 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
85 #define MODULES_END (MODULES_VADDR + SZ_256M)
87 #define VMALLOC_START MODULES_END
90 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE)
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))
98 #ifndef __PAGETABLE_PUD_FOLDED
99 #define pud_ERROR(e) \
100 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
102 #define pgd_ERROR(e) \
103 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
105 extern pte_t invalid_pte_table[PTRS_PER_PTE];
107 #ifndef __PAGETABLE_PUD_FOLDED
109 typedef struct { unsigned long pud; } pud_t;
110 #define pud_val(x) ((x).pud)
111 #define __pud(x) ((pud_t) { (x) })
113 extern pud_t invalid_pud_table[PTRS_PER_PUD];
116 * Empty pgd/p4d entries point to the invalid_pud_table.
118 static inline int p4d_none(p4d_t p4d)
120 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
123 static inline int p4d_bad(p4d_t p4d)
125 return p4d_val(p4d) & ~PAGE_MASK;
128 static inline int p4d_present(p4d_t p4d)
130 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
133 static inline void p4d_clear(p4d_t *p4dp)
135 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
138 static inline pud_t *p4d_pgtable(p4d_t p4d)
140 return (pud_t *)p4d_val(p4d);
143 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
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))
153 #ifndef __PAGETABLE_PMD_FOLDED
155 typedef struct { unsigned long pmd; } pmd_t;
156 #define pmd_val(x) ((x).pmd)
157 #define __pmd(x) ((pmd_t) { (x) })
159 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
162 * Empty pud entries point to the invalid_pmd_table.
164 static inline int pud_none(pud_t pud)
166 return pud_val(pud) == (unsigned long)invalid_pmd_table;
169 static inline int pud_bad(pud_t pud)
171 return pud_val(pud) & ~PAGE_MASK;
174 static inline int pud_present(pud_t pud)
176 return pud_val(pud) != (unsigned long)invalid_pmd_table;
179 static inline void pud_clear(pud_t *pudp)
181 pud_val(*pudp) = ((unsigned long)invalid_pmd_table);
184 static inline pmd_t *pud_pgtable(pud_t pud)
186 return (pmd_t *)pud_val(pud);
189 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
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))
197 * Empty pmd entries point to the invalid_pte_table.
199 static inline int pmd_none(pmd_t pmd)
201 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
204 static inline int pmd_bad(pmd_t pmd)
206 return (pmd_val(pmd) & ~PAGE_MASK);
209 static inline int pmd_present(pmd_t pmd)
211 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
212 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE));
214 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
217 static inline void pmd_clear(pmd_t *pmdp)
219 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table);
222 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
224 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
226 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
227 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
228 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
230 #define pmd_page_vaddr(pmd) pmd_val(pmd)
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);
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))
241 * Initialize a new pgd / pmd table with invalid pointers.
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);
248 * Non-present pages: high 40 bits are offset, next 8 bits type,
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; }
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 })
262 extern void paging_init(void);
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)
268 static inline void set_pte(pte_t *ptep, pte_t pteval)
271 if (pte_val(pteval) & _PAGE_GLOBAL) {
272 pte_t *buddy = ptep_buddy(ptep);
274 * Make sure the buddy is global too (if it's !none,
275 * it better already be global)
279 * For SMP, multiple CPUs can race, so we need to do
282 unsigned long page_global = _PAGE_GLOBAL;
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"
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 */
303 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
304 pte_t *ptep, pte_t pteval)
306 set_pte(ptep, pteval);
309 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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));
315 set_pte_at(mm, addr, ptep, __pte(0));
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)
322 extern pgd_t swapper_pg_dir[];
323 extern pgd_t invalid_pg_dir[];
326 * The following only work if pte_present() is true.
327 * Undefined behaviour if not..
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; }
333 static inline pte_t pte_mkold(pte_t pte)
335 pte_val(pte) &= ~_PAGE_ACCESSED;
339 static inline pte_t pte_mkyoung(pte_t pte)
341 pte_val(pte) |= _PAGE_ACCESSED;
345 static inline pte_t pte_mkclean(pte_t pte)
347 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
351 static inline pte_t pte_mkdirty(pte_t pte)
353 pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
357 static inline pte_t pte_mkwrite(pte_t pte)
359 pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
363 static inline pte_t pte_wrprotect(pte_t pte)
365 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
369 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
371 static inline pte_t pte_mkhuge(pte_t pte)
373 pte_val(pte) |= _PAGE_HUGE;
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 */
382 #define pte_accessible pte_accessible
383 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
385 if (pte_val(a) & _PAGE_PRESENT)
388 if ((pte_val(a) & _PAGE_PROTNONE) &&
389 atomic_read(&mm->tlb_flush_pending))
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.
399 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
401 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
403 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
404 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
407 extern void __update_tlb(struct vm_area_struct *vma,
408 unsigned long address, pte_t *ptep);
410 static inline void update_mmu_cache(struct vm_area_struct *vma,
411 unsigned long address, pte_t *ptep)
413 __update_tlb(vma, address, ptep);
416 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
417 unsigned long address, pmd_t *pmdp)
419 __update_tlb(vma, address, (pte_t *)pmdp);
422 #define kern_addr_valid(addr) (1)
424 static inline unsigned long pmd_pfn(pmd_t pmd)
426 return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT;
429 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
431 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
432 #define pmdp_establish generic_pmdp_establish
434 static inline int pmd_trans_huge(pmd_t pmd)
436 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
439 static inline pmd_t pmd_mkhuge(pmd_t pmd)
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;
448 #define pmd_write pmd_write
449 static inline int pmd_write(pmd_t pmd)
451 return !!(pmd_val(pmd) & _PAGE_WRITE);
454 static inline pmd_t pmd_mkwrite(pmd_t pmd)
456 pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
460 static inline pmd_t pmd_wrprotect(pmd_t pmd)
462 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
466 static inline int pmd_dirty(pmd_t pmd)
468 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
471 static inline pmd_t pmd_mkclean(pmd_t pmd)
473 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
477 static inline pmd_t pmd_mkdirty(pmd_t pmd)
479 pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
483 static inline int pmd_young(pmd_t pmd)
485 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
488 static inline pmd_t pmd_mkold(pmd_t pmd)
490 pmd_val(pmd) &= ~_PAGE_ACCESSED;
494 static inline pmd_t pmd_mkyoung(pmd_t pmd)
496 pmd_val(pmd) |= _PAGE_ACCESSED;
500 static inline struct page *pmd_page(pmd_t pmd)
502 if (pmd_trans_huge(pmd))
503 return pfn_to_page(pmd_pfn(pmd));
505 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
508 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
510 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
511 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
515 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
517 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
523 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
524 * different prototype.
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)
537 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
539 #ifdef CONFIG_NUMA_BALANCING
540 static inline long pte_protnone(pte_t pte)
542 return (pte_val(pte) & _PAGE_PROTNONE);
545 static inline long pmd_protnone(pmd_t pmd)
547 return (pmd_val(pmd) & _PAGE_PROTNONE);
549 #endif /* CONFIG_NUMA_BALANCING */
552 * We provide our own get_unmapped area to cope with the virtual aliasing
553 * constraints placed on us by the cache architecture.
555 #define HAVE_ARCH_UNMAPPED_AREA
556 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
558 #endif /* !__ASSEMBLY__ */
560 #endif /* _ASM_PGTABLE_H */