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

INCLUDED FROM

DEFINITIONS

1. pgd_newpage
2. pgd_mkuptodate
3. pud_clear
4. pte_pfn
5. pfn_pte
6. pfn_pmd

   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 #define __ARCH_USE_5LEVEL_HACK
  11 #include <asm-generic/pgtable-nopud.h>
  12 
  13 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  14 
  15 #ifdef CONFIG_64BIT
  16 #define PGDIR_SHIFT     30
  17 #else
  18 #define PGDIR_SHIFT     31
  19 #endif
  20 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  21 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  22 
  23 /* PMD_SHIFT determines the size of the area a second-level page table can
  24  * map
  25  */
  26 
  27 #define PMD_SHIFT       21
  28 #define PMD_SIZE        (1UL << PMD_SHIFT)
  29 #define PMD_MASK        (~(PMD_SIZE-1))
  30 
  31 /*
  32  * entries per page directory level
  33  */
  34 
  35 #define PTRS_PER_PTE 512
  36 #ifdef CONFIG_64BIT
  37 #define PTRS_PER_PMD 512
  38 #define PTRS_PER_PGD 512
  39 #else
  40 #define PTRS_PER_PMD 1024
  41 #define PTRS_PER_PGD 1024
  42 #endif
  43 
  44 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  45 #define FIRST_USER_ADDRESS      0UL
  46 
  47 #define pte_ERROR(e) \
  48         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  49                pte_val(e))
  50 #define pmd_ERROR(e) \
  51         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  52                pmd_val(e))
  53 #define pgd_ERROR(e) \
  54         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  55                pgd_val(e))
  56 
  57 #define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  58 #define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  59 #define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  60 #define pud_populate(mm, pud, pmd) \
  61         set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  62 
  63 #ifdef CONFIG_64BIT
  64 #define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
  65 #else
  66 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  67 #endif
  68 
  69 static inline int pgd_newpage(pgd_t pgd)
  70 {
  71         return(pgd_val(pgd) & _PAGE_NEWPAGE);
  72 }
  73 
  74 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  75 
  76 #ifdef CONFIG_64BIT
  77 #define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
  78 #else
  79 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  80 #endif
  81 
  82 struct mm_struct;
  83 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  84 
  85 static inline void pud_clear (pud_t *pud)
  86 {
  87         set_pud(pud, __pud(_PAGE_NEWPAGE));
  88 }
  89 
  90 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  91 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  92 
  93 /* Find an entry in the second-level page table.. */
  94 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  95                         pmd_index(address))
  96 
  97 static inline unsigned long pte_pfn(pte_t pte)
  98 {
  99         return phys_to_pfn(pte_val(pte));
 100 }
 101 
 102 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 103 {
 104         pte_t pte;
 105         phys_t phys = pfn_to_phys(page_nr);
 106 
 107         pte_set_val(pte, phys, pgprot);
 108         return pte;
 109 }
 110 
 111 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 112 {
 113         return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 114 }
 115 
 116 #endif
 117