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Linux/arch/um/include/asm/pgtable-3level.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright 2003 PathScale Inc
  4  * Derived from include/asm-i386/pgtable.h
  5  */
  6 
  7 #ifndef __UM_PGTABLE_3LEVEL_H
  8 #define __UM_PGTABLE_3LEVEL_H
  9 
 10 #include <asm-generic/pgtable-nopud.h>
 11 
 12 /* PGDIR_SHIFT determines what a third-level page table entry can map */
 13 
 14 #ifdef CONFIG_64BIT
 15 #define PGDIR_SHIFT     30
 16 #else
 17 #define PGDIR_SHIFT     31
 18 #endif
 19 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 20 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 21 
 22 /* PMD_SHIFT determines the size of the area a second-level page table can
 23  * map
 24  */
 25 
 26 #define PMD_SHIFT       21
 27 #define PMD_SIZE        (1UL << PMD_SHIFT)
 28 #define PMD_MASK        (~(PMD_SIZE-1))
 29 
 30 /*
 31  * entries per page directory level
 32  */
 33 
 34 #define PTRS_PER_PTE 512
 35 #ifdef CONFIG_64BIT
 36 #define PTRS_PER_PMD 512
 37 #define PTRS_PER_PGD 512
 38 #else
 39 #define PTRS_PER_PMD 1024
 40 #define PTRS_PER_PGD 1024
 41 #endif
 42 
 43 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
 44 #define FIRST_USER_ADDRESS      0UL
 45 
 46 #define pte_ERROR(e) \
 47         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 48                pte_val(e))
 49 #define pmd_ERROR(e) \
 50         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 51                pmd_val(e))
 52 #define pgd_ERROR(e) \
 53         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 54                pgd_val(e))
 55 
 56 #define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
 57 #define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 58 #define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
 59 #define pud_populate(mm, pud, pmd) \
 60         set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
 61 
 62 #ifdef CONFIG_64BIT
 63 #define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
 64 #else
 65 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
 66 #endif
 67 
 68 static inline int pgd_newpage(pgd_t pgd)
 69 {
 70         return(pgd_val(pgd) & _PAGE_NEWPAGE);
 71 }
 72 
 73 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
 74 
 75 #ifdef CONFIG_64BIT
 76 #define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
 77 #else
 78 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
 79 #endif
 80 
 81 struct mm_struct;
 82 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
 83 
 84 static inline void pud_clear (pud_t *pud)
 85 {
 86         set_pud(pud, __pud(_PAGE_NEWPAGE));
 87 }
 88 
 89 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
 90 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
 91 
 92 /* Find an entry in the second-level page table.. */
 93 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
 94                         pmd_index(address))
 95 
 96 static inline unsigned long pte_pfn(pte_t pte)
 97 {
 98         return phys_to_pfn(pte_val(pte));
 99 }
100 
101 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
102 {
103         pte_t pte;
104         phys_t phys = pfn_to_phys(page_nr);
105 
106         pte_set_val(pte, phys, pgprot);
107         return pte;
108 }
109 
110 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
111 {
112         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
113 }
114 
115 #endif
116 
117 

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