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 }
73
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