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
  45#define pte_ERROR(e) \
  46        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  47               pte_val(e))
  48#define pmd_ERROR(e) \
  49        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  50               pmd_val(e))
  51#define pgd_ERROR(e) \
  52        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  53               pgd_val(e))
  54
  55#define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  56#define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  57#define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  58#define pud_populate(mm, pud, pmd) \
  59        set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  60
  61#ifdef CONFIG_64BIT
  62#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
  63#else
  64#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  65#endif
  66
  67static inline int pgd_newpage(pgd_t pgd)
  68{
  69        return(pgd_val(pgd) & _PAGE_NEWPAGE);
  70}
  71
  72static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  73
  74#ifdef CONFIG_64BIT
  75#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
  76#else
  77#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  78#endif
  79
  80static inline void pud_clear (pud_t *pud)
  81{
  82        set_pud(pud, __pud(_PAGE_NEWPAGE));
  83}
  84
  85#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  86#define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))
  87
  88static inline unsigned long pte_pfn(pte_t pte)
  89{
  90        return phys_to_pfn(pte_val(pte));
  91}
  92
  93static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
  94{
  95        pte_t pte;
  96        phys_t phys = pfn_to_phys(page_nr);
  97
  98        pte_set_val(pte, phys, pgprot);
  99        return pte;
 100}
 101
 102static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 103{
 104        return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 105}
 106
 107#endif
 108
 109