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

   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 */
  22 typedef 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
  31 static inline int pud_present(pud_t pud)
  32 {
  33         return (pud_val(pud) & _PAGE_PRESENT);
  34 }
  35
  36 static inline int pud_none(pud_t pud)
  37 {
  38         return (pud_val(pud) == 0);
  39 }
  40
  41 static inline int pud_bad(pud_t pud)
  42 {
  43         return !pud_present(pud);
  44 }
  45
  46 #define pud_leaf        pud_leaf
  47 static inline int pud_leaf(pud_t pud)
  48 {
  49         return pud_present(pud) &&
  50                (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
  51 }
  52
  53 static inline void set_pud(pud_t *pudp, pud_t pud)
  54 {
  55         *pudp = pud;
  56 }
  57
  58 static inline void pud_clear(pud_t *pudp)
  59 {
  60         set_pud(pudp, __pud(0));
  61 }
  62
  63 static inline unsigned long pud_page_vaddr(pud_t pud)
  64 {
  65         return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT);
  66 }
  67
  68 static inline struct page *pud_page(pud_t pud)
  69 {
  70         return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT);
  71 }
  72
  73 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
  74
  75 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
  76 {
  77         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
  78 }
  79
  80 static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
  81 {
  82         return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
  83 }
  84
  85 static inline unsigned long _pmd_pfn(pmd_t pmd)
  86 {
  87         return pmd_val(pmd) >> _PAGE_PFN_SHIFT;
  88 }
  89
  90 #define pmd_ERROR(e) \
  91         pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
  92
  93 #endif /* _ASM_RISCV_PGTABLE_64_H */