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>
64 struct vm_area_struct;
67 * ZERO_PAGE is a global shared page that is always zero; used
68 * for zero-mapped memory areas etc..
71 extern unsigned long empty_zero_page;
72 extern unsigned long zero_page_mask;
74 #define ZERO_PAGE(vaddr) \
75 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
76 #define __HAVE_COLOR_ZERO_PAGE
79 * TLB refill handlers may also map the vmalloc area into xkvrange.
80 * Avoid the first couple of pages so NULL pointer dereferences will
81 * still reliably trap.
83 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
84 #define MODULES_END (MODULES_VADDR + SZ_256M)
86 #define VMALLOC_START MODULES_END
89 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE)
91 #define pte_ERROR(e) \
92 pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
93 #ifndef __PAGETABLE_PMD_FOLDED
94 #define pmd_ERROR(e) \
95 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
97 #ifndef __PAGETABLE_PUD_FOLDED
98 #define pud_ERROR(e) \
99 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
101 #define pgd_ERROR(e) \
102 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
104 extern pte_t invalid_pte_table[PTRS_PER_PTE];
106 #ifndef __PAGETABLE_PUD_FOLDED
108 typedef struct { unsigned long pud; } pud_t;
109 #define pud_val(x) ((x).pud)
110 #define __pud(x) ((pud_t) { (x) })
112 extern pud_t invalid_pud_table[PTRS_PER_PUD];
115 * Empty pgd/p4d entries point to the invalid_pud_table.
117 static inline int p4d_none(p4d_t p4d)
119 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
122 static inline int p4d_bad(p4d_t p4d)
124 return p4d_val(p4d) & ~PAGE_MASK;
127 static inline int p4d_present(p4d_t p4d)
129 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
132 static inline void p4d_clear(p4d_t *p4dp)
134 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
137 static inline pud_t *p4d_pgtable(p4d_t p4d)
139 return (pud_t *)p4d_val(p4d);
142 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
147 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
148 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
152 #ifndef __PAGETABLE_PMD_FOLDED
154 typedef struct { unsigned long pmd; } pmd_t;
155 #define pmd_val(x) ((x).pmd)
156 #define __pmd(x) ((pmd_t) { (x) })
158 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
161 * Empty pud entries point to the invalid_pmd_table.
163 static inline int pud_none(pud_t pud)
165 return pud_val(pud) == (unsigned long)invalid_pmd_table;
168 static inline int pud_bad(pud_t pud)
170 return pud_val(pud) & ~PAGE_MASK;
173 static inline int pud_present(pud_t pud)
175 return pud_val(pud) != (unsigned long)invalid_pmd_table;
178 static inline void pud_clear(pud_t *pudp)
180 pud_val(*pudp) = ((unsigned long)invalid_pmd_table);
183 static inline pmd_t *pud_pgtable(pud_t pud)
185 return (pmd_t *)pud_val(pud);
188 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
190 #define pud_phys(pud) PHYSADDR(pud_val(pud))
191 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
196 * Empty pmd entries point to the invalid_pte_table.
198 static inline int pmd_none(pmd_t pmd)
200 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
203 static inline int pmd_bad(pmd_t pmd)
205 return (pmd_val(pmd) & ~PAGE_MASK);
208 static inline int pmd_present(pmd_t pmd)
210 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
211 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE));
213 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
216 static inline void pmd_clear(pmd_t *pmdp)
218 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table);
221 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
223 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
225 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
226 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
227 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
229 #define pmd_page_vaddr(pmd) pmd_val(pmd)
231 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
232 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
234 #define pte_page(x) pfn_to_page(pte_pfn(x))
235 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT))
236 #define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
237 #define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
240 * Initialize a new pgd / pmd table with invalid pointers.
242 extern void pgd_init(unsigned long page);
243 extern void pud_init(unsigned long page, unsigned long pagetable);
244 extern void pmd_init(unsigned long page, unsigned long pagetable);
247 * Non-present pages: high 40 bits are offset, next 8 bits type,
250 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
251 { pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; }
253 #define __swp_type(x) (((x).val >> 16) & 0xff)
254 #define __swp_offset(x) ((x).val >> 24)
255 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
256 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
257 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
258 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
259 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
261 extern void paging_init(void);
263 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
264 #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
265 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
267 static inline void set_pte(pte_t *ptep, pte_t pteval)
270 if (pte_val(pteval) & _PAGE_GLOBAL) {
271 pte_t *buddy = ptep_buddy(ptep);
273 * Make sure the buddy is global too (if it's !none,
274 * it better already be global)
278 * For SMP, multiple CPUs can race, so we need to do
281 unsigned long page_global = _PAGE_GLOBAL;
284 __asm__ __volatile__ (
285 "1:" __LL "%[tmp], %[buddy] \n"
286 " bnez %[tmp], 2f \n"
287 " or %[tmp], %[tmp], %[global] \n"
288 __SC "%[tmp], %[buddy] \n"
289 " beqz %[tmp], 1b \n"
293 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
294 : [global] "r" (page_global));
295 #else /* !CONFIG_SMP */
296 if (pte_none(*buddy))
297 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
298 #endif /* CONFIG_SMP */
302 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
303 pte_t *ptep, pte_t pteval)
305 set_pte(ptep, pteval);
308 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
310 /* Preserve global status for the pair */
311 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
312 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
314 set_pte_at(mm, addr, ptep, __pte(0));
317 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
318 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
319 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
321 extern pgd_t swapper_pg_dir[];
322 extern pgd_t invalid_pg_dir[];
325 * The following only work if pte_present() is true.
326 * Undefined behaviour if not..
328 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
329 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
330 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
332 static inline pte_t pte_mkold(pte_t pte)
334 pte_val(pte) &= ~_PAGE_ACCESSED;
338 static inline pte_t pte_mkyoung(pte_t pte)
340 pte_val(pte) |= _PAGE_ACCESSED;
344 static inline pte_t pte_mkclean(pte_t pte)
346 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
350 static inline pte_t pte_mkdirty(pte_t pte)
352 pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
356 static inline pte_t pte_mkwrite(pte_t pte)
358 pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
362 static inline pte_t pte_wrprotect(pte_t pte)
364 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
368 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
370 static inline pte_t pte_mkhuge(pte_t pte)
372 pte_val(pte) |= _PAGE_HUGE;
376 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
377 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
378 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
379 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
381 #define pte_accessible pte_accessible
382 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
384 if (pte_val(a) & _PAGE_PRESENT)
387 if ((pte_val(a) & _PAGE_PROTNONE) &&
388 atomic_read(&mm->tlb_flush_pending))
395 * Conversion functions: convert a page and protection to a page entry,
396 * and a page entry and page directory to the page they refer to.
398 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
400 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
402 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
403 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
406 extern void __update_tlb(struct vm_area_struct *vma,
407 unsigned long address, pte_t *ptep);
409 static inline void update_mmu_cache(struct vm_area_struct *vma,
410 unsigned long address, pte_t *ptep)
412 __update_tlb(vma, address, ptep);
415 #define __HAVE_ARCH_UPDATE_MMU_TLB
416 #define update_mmu_tlb update_mmu_cache
418 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
419 unsigned long address, pmd_t *pmdp)
421 __update_tlb(vma, address, (pte_t *)pmdp);
424 #define kern_addr_valid(addr) (1)
426 static inline unsigned long pmd_pfn(pmd_t pmd)
428 return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT;
431 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
433 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
434 #define pmdp_establish generic_pmdp_establish
436 static inline int pmd_trans_huge(pmd_t pmd)
438 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
441 static inline pmd_t pmd_mkhuge(pmd_t pmd)
443 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
444 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
445 pmd_val(pmd) |= _PAGE_HUGE;
450 #define pmd_write pmd_write
451 static inline int pmd_write(pmd_t pmd)
453 return !!(pmd_val(pmd) & _PAGE_WRITE);
456 static inline pmd_t pmd_mkwrite(pmd_t pmd)
458 pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
462 static inline pmd_t pmd_wrprotect(pmd_t pmd)
464 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
468 static inline int pmd_dirty(pmd_t pmd)
470 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
473 static inline pmd_t pmd_mkclean(pmd_t pmd)
475 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
479 static inline pmd_t pmd_mkdirty(pmd_t pmd)
481 pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
485 static inline int pmd_young(pmd_t pmd)
487 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
490 static inline pmd_t pmd_mkold(pmd_t pmd)
492 pmd_val(pmd) &= ~_PAGE_ACCESSED;
496 static inline pmd_t pmd_mkyoung(pmd_t pmd)
498 pmd_val(pmd) |= _PAGE_ACCESSED;
502 static inline struct page *pmd_page(pmd_t pmd)
504 if (pmd_trans_huge(pmd))
505 return pfn_to_page(pmd_pfn(pmd));
507 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
510 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
512 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
513 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
517 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
519 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
525 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
526 * different prototype.
528 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
529 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
530 unsigned long address, pmd_t *pmdp)
539 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
541 #ifdef CONFIG_NUMA_BALANCING
542 static inline long pte_protnone(pte_t pte)
544 return (pte_val(pte) & _PAGE_PROTNONE);
547 static inline long pmd_protnone(pmd_t pmd)
549 return (pmd_val(pmd) & _PAGE_PROTNONE);
551 #endif /* CONFIG_NUMA_BALANCING */
554 * We provide our own get_unmapped area to cope with the virtual aliasing
555 * constraints placed on us by the cache architecture.
557 #define HAVE_ARCH_UNMAPPED_AREA
558 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
560 #endif /* !__ASSEMBLY__ */
562 #endif /* _ASM_PGTABLE_H */