linux/arch/riscv/include/asm/pgtable-64.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2012 Regents of the University of California
   4 */
   5
   6#ifndef _ASM_RISCV_PGTABLE_64_H
   7#define _ASM_RISCV_PGTABLE_64_H
   8
   9#include <linux/const.h>
  10
  11#define PGDIR_SHIFT     30
  12/* Size of region mapped by a page global directory */
  13#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  14#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  15
  16#define PMD_SHIFT       21
  17/* Size of region mapped by a page middle directory */
  18#define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
  19#define PMD_MASK        (~(PMD_SIZE - 1))
  20
  21/* Page Middle Directory entry */
  22typedef struct {
  23        unsigned long pmd;
  24} pmd_t;
  25
  26#define pmd_val(x)      ((x).pmd)
  27#define __pmd(x)        ((pmd_t) { (x) })
  28
  29#define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
  30
  31static inline int pud_present(pud_t pud)
  32{
  33        return (pud_val(pud) & _PAGE_PRESENT);
  34}
  35
  36static inline int pud_none(pud_t pud)
  37{
  38        return (pud_val(pud) == 0);
  39}
  40
  41static inline int pud_bad(pud_t pud)
  42{
  43        return !pud_present(pud);
  44}
  45
  46#define pud_leaf        pud_leaf
  47static inline int pud_leaf(pud_t pud)
  48{
  49        return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
  50}
  51
  52static inline void set_pud(pud_t *pudp, pud_t pud)
  53{
  54        *pudp = pud;
  55}
  56
  57static inline void pud_clear(pud_t *pudp)
  58{
  59        set_pud(pudp, __pud(0));
  60}
  61
  62static inline pmd_t *pud_pgtable(pud_t pud)
  63{
  64        return (pmd_t *)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT);
  65}
  66
  67static inline struct page *pud_page(pud_t pud)
  68{
  69        return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT);
  70}
  71
  72static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
  73{
  74        return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
  75}
  76
  77static inline unsigned long _pmd_pfn(pmd_t pmd)
  78{
  79        return pmd_val(pmd) >> _PAGE_PFN_SHIFT;
  80}
  81
  82#define mk_pmd(page, prot)    pfn_pmd(page_to_pfn(page), prot)
  83
  84#define pmd_ERROR(e) \
  85        pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
  86
  87#endif /* _ASM_RISCV_PGTABLE_64_H */
  88