LXR linux/arch/riscv/include/asm/pgalloc.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
   4 * Copyright (C) 2012 Regents of the University of California
   5 */
   6
   7#ifndef _ASM_RISCV_PGALLOC_H
   8#define _ASM_RISCV_PGALLOC_H
   9
  10#include <linux/mm.h>
  11#include <asm/tlb.h>
  12
  13#include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  14
  15static inline void pmd_populate_kernel(struct mm_struct *mm,
  16        pmd_t *pmd, pte_t *pte)
  17{
  18        unsigned long pfn = virt_to_pfn(pte);
  19
  20        set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  21}
  22
  23static inline void pmd_populate(struct mm_struct *mm,
  24        pmd_t *pmd, pgtable_t pte)
  25{
  26        unsigned long pfn = virt_to_pfn(page_address(pte));
  27
  28        set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  29}
  30
  31#ifndef __PAGETABLE_PMD_FOLDED
  32static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  33{
  34        unsigned long pfn = virt_to_pfn(pmd);
  35
  36        set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
  37}
  38#endif /* __PAGETABLE_PMD_FOLDED */
  39
  40#define pmd_pgtable(pmd)        pmd_page(pmd)
  41
  42static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  43{
  44        pgd_t *pgd;
  45
  46        pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
  47        if (likely(pgd != NULL)) {
  48                memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
  49                /* Copy kernel mappings */
  50                memcpy(pgd + USER_PTRS_PER_PGD,
  51                        init_mm.pgd + USER_PTRS_PER_PGD,
  52                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  53        }
  54        return pgd;
  55}
  56
  57static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  58{
  59        free_page((unsigned long)pgd);
  60}
  61
  62#ifndef __PAGETABLE_PMD_FOLDED
  63
  64static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  65{
  66        return (pmd_t *)__get_free_page(
  67                GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
  68}
  69
  70static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  71{
  72        free_page((unsigned long)pmd);
  73}
  74
  75#define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)
  76
  77#endif /* __PAGETABLE_PMD_FOLDED */
  78
  79#define __pte_free_tlb(tlb, pte, buf)   \
  80do {                                    \
  81        pgtable_pte_page_dtor(pte);     \
  82        tlb_remove_page((tlb), pte);    \
  83} while (0)
  84
  85#endif /* _ASM_RISCV_PGALLOC_H */
  86