arch/sh/mm/hugetlbpage.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/mm/hugetlbpage.c
   4  *
   5  * SuperH HugeTLB page support.
   6  *
   7  * Cloned from sparc64 by Paul Mundt.
   8  *
   9  * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/mm.h>
  15 #include <linux/hugetlb.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/sysctl.h>
  18
  19 #include <asm/mman.h>
  20 #include <asm/tlb.h>
  21 #include <asm/tlbflush.h>
  22 #include <asm/cacheflush.h>
  23
  24 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
  25                         unsigned long addr, unsigned long sz)
  26 {
  27         pgd_t *pgd;
  28         p4d_t *p4d;
  29         pud_t *pud;
  30         pmd_t *pmd;
  31         pte_t *pte = NULL;
  32
  33         pgd = pgd_offset(mm, addr);
  34         if (pgd) {
  35                 p4d = p4d_alloc(mm, pgd, addr);
  36                 if (p4d) {
  37                         pud = pud_alloc(mm, p4d, addr);
  38                         if (pud) {
  39                                 pmd = pmd_alloc(mm, pud, addr);
  40                                 if (pmd)
  41                                         pte = pte_alloc_huge(mm, pmd, addr);
  42                         }
  43                 }
  44         }
  45
  46         return pte;
  47 }
  48
  49 pte_t *huge_pte_offset(struct mm_struct *mm,
  50                        unsigned long addr, unsigned long sz)
  51 {
  52         pgd_t *pgd;
  53         p4d_t *p4d;
  54         pud_t *pud;
  55         pmd_t *pmd;
  56         pte_t *pte = NULL;
  57
  58         pgd = pgd_offset(mm, addr);
  59         if (pgd) {
  60                 p4d = p4d_offset(pgd, addr);
  61                 if (p4d) {
  62                         pud = pud_offset(p4d, addr);
  63                         if (pud) {
  64                                 pmd = pmd_offset(pud, addr);
  65                                 if (pmd)
  66                                         pte = pte_offset_huge(pmd, addr);
  67                         }
  68                 }
  69         }
  70
  71         return pte;
  72 }