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 */
  30 typedef 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
  39 static inline int pud_present(pud_t pud)
  40 {
  41         return (pud_val(pud) & _PAGE_PRESENT);
  42 }
  43
  44 static inline int pud_none(pud_t pud)
  45 {
  46         return (pud_val(pud) == 0);
  47 }
  48
  49 static inline int pud_bad(pud_t pud)
  50 {
  51         return !pud_present(pud);
  52 }
  53
  54 static inline void set_pud(pud_t *pudp, pud_t pud)
  55 {
  56         *pudp = pud;
  57 }
  58
  59 static inline void pud_clear(pud_t *pudp)
  60 {
  61         set_pud(pudp, __pud(0));
  62 }
  63
  64 static 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
  71 static 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
  76 static 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 */