xref: /openbmc/linux/arch/sh/mm/hugetlbpage.c (revision b7b7ef6b)
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 
huge_pte_alloc(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long addr,unsigned long sz)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 
huge_pte_offset(struct mm_struct * mm,unsigned long addr,unsigned long sz)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 
pmd_huge(pmd_t pmd)74 int pmd_huge(pmd_t pmd)
75 {
76 	return 0;
77 }
78 
pud_huge(pud_t pud)79 int pud_huge(pud_t pud)
80 {
81 	return 0;
82 }
83