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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 unsigned long sz)
41{
42 pgd_t *pgd;
43 pud_t *pud;
44 pmd_t *pmd = NULL;
45
46 pgd = pgd_offset(mm, addr);
47 if (pgd_present(*pgd)) {
48 pud = pud_offset(pgd, addr);
49 if (pud_present(*pud))
50 pmd = pmd_offset(pud, addr);
51 }
52 return (pte_t *) pmd;
53}
54
55/*
56 * This function checks for proper alignment of input addr and len parameters.
57 */
58int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
59{
60 if (len & ~HPAGE_MASK)
61 return -EINVAL;
62 if (addr & ~HPAGE_MASK)
63 return -EINVAL;
64 return 0;
65}
66
67int pmd_huge(pmd_t pmd)
68{
69 return (pmd_val(pmd) & _PAGE_HUGE) != 0;
70}
71
72int pud_huge(pud_t pud)
73{
74 return (pud_val(pud) & _PAGE_HUGE) != 0;
75}
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
71struct page *
72follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
73{
74 return ERR_PTR(-EINVAL);
75}
76
77int pmd_huge(pmd_t pmd)
78{
79 return (pmd_val(pmd) & _PAGE_HUGE) != 0;
80}
81
82int pud_huge(pud_t pud)
83{
84 return (pud_val(pud) & _PAGE_HUGE) != 0;
85}
86
87int pmd_huge_support(void)
88{
89 return 1;
90}
91
92struct page *
93follow_huge_pmd(struct mm_struct *mm, unsigned long address,
94 pmd_t *pmd, int write)
95{
96 struct page *page;
97
98 page = pte_page(*(pte_t *)pmd);
99 if (page)
100 page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
101 return page;
102}