LXR linux/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
  21static 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
  29static 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
  38static 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
  48static 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
  63static 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
  70static 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
  76static 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
  85static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  86        unsigned long address)
  87{
  88        return (pte_t *)__get_free_page(
  89                GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  90}
  91
  92static inline struct page *pte_alloc_one(struct mm_struct *mm,
  93        unsigned long address)
  94{
  95        struct page *pte;
  96
  97        pte = alloc_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  98        if (likely(pte != NULL))
  99                pgtable_page_ctor(pte);
 100        return pte;
 101}
 102
 103static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 104{
 105        free_page((unsigned long)pte);
 106}
 107
 108static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 109{
 110        pgtable_page_dtor(pte);
 111        __free_page(pte);
 112}
 113
 114#define __pte_free_tlb(tlb, pte, buf)   \
 115do {                                    \
 116        pgtable_page_dtor(pte);         \
 117        tlb_remove_page((tlb), pte);    \
 118} while (0)
 119
 120static inline void check_pgt_cache(void)
 121{
 122}
 123
 124#endif /* _ASM_RISCV_PGALLOC_H */
 125