arch/riscv/include/asm/pgalloc.h

   1 /*
   2  * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
   3  * Copyright (C) 2012 Regents of the University of California
   4  *
   5  *   This program is free software; you can redistribute it and/or
   6  *   modify it under the terms of the GNU General Public License
   7  *   as published by the Free Software Foundation, version 2.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  */
  14
  15 #ifndef _ASM_RISCV_PGALLOC_H
  16 #define _ASM_RISCV_PGALLOC_H
  17
  18 #include <linux/mm.h>
  19 #include <asm/tlb.h>
  20
  21 static inline void pmd_populate_kernel(struct mm_struct *mm,
  22         pmd_t *pmd, pte_t *pte)
  23 {
  24         unsigned long pfn = virt_to_pfn(pte);
  25
  26         set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  27 }
  28
  29 static inline void pmd_populate(struct mm_struct *mm,
  30         pmd_t *pmd, pgtable_t pte)
  31 {
  32         unsigned long pfn = virt_to_pfn(page_address(pte));
  33
  34         set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  35 }
  36
  37 #ifndef __PAGETABLE_PMD_FOLDED
  38 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  39 {
  40         unsigned long pfn = virt_to_pfn(pmd);
  41
  42         set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  43 }
  44 #endif /* __PAGETABLE_PMD_FOLDED */
  45
  46 #define pmd_pgtable(pmd)        pmd_page(pmd)
  47
  48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  49 {
  50         pgd_t *pgd;
  51
  52         pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
  53         if (likely(pgd != NULL)) {
  54                 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
  55                 /* Copy kernel mappings */
  56                 memcpy(pgd + USER_PTRS_PER_PGD,
  57                         init_mm.pgd + USER_PTRS_PER_PGD,
  58                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  59         }
  60         return pgd;
  61 }
  62
  63 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  64 {
  65         free_page((unsigned long)pgd);
  66 }
  67
  68 #ifndef __PAGETABLE_PMD_FOLDED
  69
  70 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  71 {
  72         return (pmd_t *)__get_free_page(
  73                 GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  74 }
  75
  76 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  77 {
  78         free_page((unsigned long)pmd);
  79 }
  80
  81 #define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)
  82
  83 #endif /* __PAGETABLE_PMD_FOLDED */
  84
  85 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  86 {
  87         return (pte_t *)__get_free_page(
  88                 GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  89 }
  90
  91 static inline struct page *pte_alloc_one(struct mm_struct *mm)
  92 {
  93         struct page *pte;
  94
  95         pte = alloc_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  96         if (likely(pte != NULL))
  97                 pgtable_page_ctor(pte);
  98         return pte;
  99 }
 100
 101 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 102 {
 103         free_page((unsigned long)pte);
 104 }
 105
 106 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 107 {
 108         pgtable_page_dtor(pte);
 109         __free_page(pte);
 110 }
 111
 112 #define __pte_free_tlb(tlb, pte, buf)   \
 113 do {                                    \
 114         pgtable_page_dtor(pte);         \
 115         tlb_remove_page((tlb), pte);    \
 116 } while (0)
 117
 118 static inline void check_pgt_cache(void)
 119 {
 120 }
 121
 122 #endif /* _ASM_RISCV_PGALLOC_H */