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, address: addr); |
36 | if (p4d) { |
37 | pud = pud_alloc(mm, p4d, address: addr); |
38 | if (pud) { |
39 | pmd = pmd_alloc(mm, pud, address: addr); |
40 | if (pmd) |
41 | pte = pte_alloc_huge(mm, pmd, address: 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, address: addr); |
61 | if (p4d) { |
62 | pud = pud_offset(p4d, address: addr); |
63 | if (pud) { |
64 | pmd = pmd_offset(pud, address: addr); |
65 | if (pmd) |
66 | pte = pte_offset_huge(pmd, address: addr); |
67 | } |
68 | } |
69 | } |
70 | |
71 | return pte; |
72 | } |
73 | |
74 | int pmd_huge(pmd_t pmd) |
75 | { |
76 | return 0; |
77 | } |
78 | |
79 | int pud_huge(pud_t pud) |
80 | { |
81 | return 0; |
82 | } |
83 | |