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>
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))
46 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
47 #define PGDIR_MASK (~(PGDIR_SIZE-1))
49 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT + PGD_ORDER - 3))
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)
55 #if CONFIG_PGTABLE_LEVELS > 2
56 #define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) >> 3)
58 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) >> 3)
60 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
64 #include <linux/mm_types.h>
65 #include <linux/mmzone.h>
66 #include <asm/fixmap.h>
70 struct vm_area_struct;
73 * ZERO_PAGE is a global shared page that is always zero; used
74 * for zero-mapped memory areas etc..
77 extern unsigned long empty_zero_page;
78 extern unsigned long zero_page_mask;
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
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.
89 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
90 #define MODULES_END (MODULES_VADDR + SZ_256M)
92 #define VMALLOC_START MODULES_END
95 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE)
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))
103 #ifndef __PAGETABLE_PUD_FOLDED
104 #define pud_ERROR(e) \
105 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
107 #define pgd_ERROR(e) \
108 pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
110 extern pte_t invalid_pte_table[PTRS_PER_PTE];
112 #ifndef __PAGETABLE_PUD_FOLDED
114 typedef struct { unsigned long pud; } pud_t;
115 #define pud_val(x) ((x).pud)
116 #define __pud(x) ((pud_t) { (x) })
118 extern pud_t invalid_pud_table[PTRS_PER_PUD];
121 * Empty pgd/p4d entries point to the invalid_pud_table.
123 static inline int p4d_none(p4d_t p4d)
125 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
128 static inline int p4d_bad(p4d_t p4d)
130 return p4d_val(p4d) & ~PAGE_MASK;
133 static inline int p4d_present(p4d_t p4d)
135 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
138 static inline void p4d_clear(p4d_t *p4dp)
140 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
143 static inline pud_t *p4d_pgtable(p4d_t p4d)
145 return (pud_t *)p4d_val(p4d);
148 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
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))
158 #ifndef __PAGETABLE_PMD_FOLDED
160 typedef struct { unsigned long pmd; } pmd_t;
161 #define pmd_val(x) ((x).pmd)
162 #define __pmd(x) ((pmd_t) { (x) })
164 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
167 * Empty pud entries point to the invalid_pmd_table.
169 static inline int pud_none(pud_t pud)
171 return pud_val(pud) == (unsigned long)invalid_pmd_table;
174 static inline int pud_bad(pud_t pud)
176 return pud_val(pud) & ~PAGE_MASK;
179 static inline int pud_present(pud_t pud)
181 return pud_val(pud) != (unsigned long)invalid_pmd_table;
184 static inline void pud_clear(pud_t *pudp)
186 pud_val(*pudp) = ((unsigned long)invalid_pmd_table);
189 static inline pmd_t *pud_pgtable(pud_t pud)
191 return (pmd_t *)pud_val(pud);
194 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
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))
202 * Empty pmd entries point to the invalid_pte_table.
204 static inline int pmd_none(pmd_t pmd)
206 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
209 static inline int pmd_bad(pmd_t pmd)
211 return (pmd_val(pmd) & ~PAGE_MASK);
214 static inline int pmd_present(pmd_t pmd)
216 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
217 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE));
219 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
222 static inline void pmd_clear(pmd_t *pmdp)
224 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table);
227 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
229 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
231 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
232 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
233 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
235 #define pmd_page_vaddr(pmd) pmd_val(pmd)
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);
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))
246 * Initialize a new pgd / pmd table with invalid pointers.
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);
253 * Non-present pages: high 40 bits are offset, next 8 bits type,
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; }
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 })
267 extern void paging_init(void);
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)
273 static inline void set_pte(pte_t *ptep, pte_t pteval)
276 if (pte_val(pteval) & _PAGE_GLOBAL) {
277 pte_t *buddy = ptep_buddy(ptep);
279 * Make sure the buddy is global too (if it's !none,
280 * it better already be global)
284 * For SMP, multiple CPUs can race, so we need to do
287 unsigned long page_global = _PAGE_GLOBAL;
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"
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 */
308 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
309 pte_t *ptep, pte_t pteval)
311 set_pte(ptep, pteval);
314 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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));
320 set_pte_at(mm, addr, ptep, __pte(0));
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)
327 extern pgd_t swapper_pg_dir[];
328 extern pgd_t invalid_pg_dir[];
331 * The following only work if pte_present() is true.
332 * Undefined behaviour if not..
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; }
338 static inline pte_t pte_mkold(pte_t pte)
340 pte_val(pte) &= ~_PAGE_ACCESSED;
344 static inline pte_t pte_mkyoung(pte_t pte)
346 pte_val(pte) |= _PAGE_ACCESSED;
350 static inline pte_t pte_mkclean(pte_t pte)
352 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
356 static inline pte_t pte_mkdirty(pte_t pte)
358 pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
362 static inline pte_t pte_mkwrite(pte_t pte)
364 pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
368 static inline pte_t pte_wrprotect(pte_t pte)
370 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
374 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
376 static inline pte_t pte_mkhuge(pte_t pte)
378 pte_val(pte) |= _PAGE_HUGE;
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 */
387 #define pte_accessible pte_accessible
388 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
390 if (pte_val(a) & _PAGE_PRESENT)
393 if ((pte_val(a) & _PAGE_PROTNONE) &&
394 atomic_read(&mm->tlb_flush_pending))
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.
404 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
406 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
408 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
409 (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
412 extern void __update_tlb(struct vm_area_struct *vma,
413 unsigned long address, pte_t *ptep);
415 static inline void update_mmu_cache(struct vm_area_struct *vma,
416 unsigned long address, pte_t *ptep)
418 __update_tlb(vma, address, ptep);
421 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
422 unsigned long address, pmd_t *pmdp)
424 __update_tlb(vma, address, (pte_t *)pmdp);
427 #define kern_addr_valid(addr) (1)
429 static inline unsigned long pmd_pfn(pmd_t pmd)
431 return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT;
434 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
436 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
437 #define pmdp_establish generic_pmdp_establish
439 static inline int pmd_trans_huge(pmd_t pmd)
441 return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
444 static inline pmd_t pmd_mkhuge(pmd_t pmd)
446 pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
447 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
448 pmd_val(pmd) |= _PAGE_HUGE;
453 #define pmd_write pmd_write
454 static inline int pmd_write(pmd_t pmd)
456 return !!(pmd_val(pmd) & _PAGE_WRITE);
459 static inline pmd_t pmd_mkwrite(pmd_t pmd)
461 pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
465 static inline pmd_t pmd_wrprotect(pmd_t pmd)
467 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
471 static inline int pmd_dirty(pmd_t pmd)
473 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
476 static inline pmd_t pmd_mkclean(pmd_t pmd)
478 pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
482 static inline pmd_t pmd_mkdirty(pmd_t pmd)
484 pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
488 static inline int pmd_young(pmd_t pmd)
490 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
493 static inline pmd_t pmd_mkold(pmd_t pmd)
495 pmd_val(pmd) &= ~_PAGE_ACCESSED;
499 static inline pmd_t pmd_mkyoung(pmd_t pmd)
501 pmd_val(pmd) |= _PAGE_ACCESSED;
505 static inline struct page *pmd_page(pmd_t pmd)
507 if (pmd_trans_huge(pmd))
508 return pfn_to_page(pmd_pfn(pmd));
510 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
513 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
515 pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
516 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
520 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
522 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
528 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
529 * different prototype.
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)
542 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
544 #ifdef CONFIG_NUMA_BALANCING
545 static inline long pte_protnone(pte_t pte)
547 return (pte_val(pte) & _PAGE_PROTNONE);
550 static inline long pmd_protnone(pmd_t pmd)
552 return (pmd_val(pmd) & _PAGE_PROTNONE);
554 #endif /* CONFIG_NUMA_BALANCING */
557 * We provide our own get_unmapped area to cope with the virtual aliasing
558 * constraints placed on us by the cache architecture.
560 #define HAVE_ARCH_UNMAPPED_AREA
561 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
563 #endif /* !__ASSEMBLY__ */
565 #endif /* _ASM_PGTABLE_H */