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
24pte_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
49pte_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
74int pmd_huge(pmd_t pmd)
75{
76	return 0;
77}
78
79int pud_huge(pud_t pud)
80{
81	return 0;
82}
83