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
24pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
25		      unsigned long sz)
26{
27	pgd_t *pgd;
28	pud_t *pud;
29	pte_t *pte = NULL;
30
31	pgd = pgd_offset(mm, addr);
32	pud = pud_alloc(mm, pgd, addr);
33	if (pud)
34		pte = (pte_t *)pmd_alloc(mm, pud, addr);
35
36	return pte;
37}
38
39pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
40{
41	pgd_t *pgd;
42	pud_t *pud;
43	pmd_t *pmd = NULL;
44
45	pgd = pgd_offset(mm, addr);
46	if (pgd_present(*pgd)) {
47		pud = pud_offset(pgd, addr);
48		if (pud_present(*pud))
49			pmd = pmd_offset(pud, addr);
50	}
51	return (pte_t *) pmd;
52}
53
54int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
55{
56	return 0;
57}
58
59/*
60 * This function checks for proper alignment of input addr and len parameters.
61 */
62int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
63{
64	if (len & ~HPAGE_MASK)
65		return -EINVAL;
66	if (addr & ~HPAGE_MASK)
67		return -EINVAL;
68	return 0;
69}
70
71int pmd_huge(pmd_t pmd)
72{
73	return (pmd_val(pmd) & _PAGE_HUGE) != 0;
74}
75
76int pud_huge(pud_t pud)
77{
78	return (pud_val(pud) & _PAGE_HUGE) != 0;
79}
80