1 /*
2 * MIPS Huge TLB Page Support for Kernel.
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
9 * Copyright 2005, Embedded Alley Solutions, Inc.
10 * Matt Porter <mporter@embeddedalley.com>
11 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
12 */
13
14 #include <linux/fs.h>
15 #include <linux/mm.h>
16 #include <linux/hugetlb.h>
17 #include <linux/pagemap.h>
18 #include <linux/err.h>
19 #include <linux/sysctl.h>
20 #include <asm/mman.h>
21 #include <asm/tlb.h>
22 #include <asm/tlbflush.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 pte_t *pte = NULL;
31
32 pgd = pgd_offset(mm, addr);
33 p4d = p4d_alloc(mm, pgd, addr);
34 pud = pud_alloc(mm, p4d, addr);
35 if (pud)
36 pte = (pte_t *)pmd_alloc(mm, pud, addr);
37
38 return pte;
39 }
40
41 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
42 unsigned long sz)
43 {
44 pgd_t *pgd;
45 p4d_t *p4d;
46 pud_t *pud;
47 pmd_t *pmd = NULL;
48
49 pgd = pgd_offset(mm, addr);
50 if (pgd_present(*pgd)) {
51 p4d = p4d_offset(pgd, addr);
52 if (p4d_present(*p4d)) {
53 pud = pud_offset(p4d, addr);
54 if (pud_present(*pud))
55 pmd = pmd_offset(pud, addr);
56 }
57 }
58 return (pte_t *) pmd;
59 }
60
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