LXR linux/arch/riscv/include/asm/pgtable-64.h

   1/*
   2 * Copyright (C) 2012 Regents of the University of California
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful,
   9 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 *   GNU General Public License for more details.
  12 */
  13
  14#ifndef _ASM_RISCV_PGTABLE_64_H
  15#define _ASM_RISCV_PGTABLE_64_H
  16
  17#include <linux/const.h>
  18
  19#define PGDIR_SHIFT     30
  20/* Size of region mapped by a page global directory */
  21#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  22#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  23
  24#define PMD_SHIFT       21
  25/* Size of region mapped by a page middle directory */
  26#define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
  27#define PMD_MASK        (~(PMD_SIZE - 1))
  28
  29/* Page Middle Directory entry */
  30typedef struct {
  31        unsigned long pmd;
  32} pmd_t;
  33
  34#define pmd_val(x)      ((x).pmd)
  35#define __pmd(x)        ((pmd_t) { (x) })
  36
  37#define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
  38
  39static inline int pud_present(pud_t pud)
  40{
  41        return (pud_val(pud) & _PAGE_PRESENT);
  42}
  43
  44static inline int pud_none(pud_t pud)
  45{
  46        return (pud_val(pud) == 0);
  47}
  48
  49static inline int pud_bad(pud_t pud)
  50{
  51        return !pud_present(pud);
  52}
  53
  54static inline void set_pud(pud_t *pudp, pud_t pud)
  55{
  56        *pudp = pud;
  57}
  58
  59static inline void pud_clear(pud_t *pudp)
  60{
  61        set_pud(pudp, __pud(0));
  62}
  63
  64static inline unsigned long pud_page_vaddr(pud_t pud)
  65{
  66        return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT);
  67}
  68
  69#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
  70
  71static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
  72{
  73        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
  74}
  75
  76static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
  77{
  78        return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
  79}
  80
  81#define pmd_ERROR(e) \
  82        pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
  83
  84#endif /* _ASM_RISCV_PGTABLE_64_H */
  85