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/init.h>
15#include <linux/fs.h>
16#include <linux/mm.h>
17#include <linux/hugetlb.h>
18#include <linux/pagemap.h>
19#include <linux/err.h>
20#include <linux/sysctl.h>
21#include <asm/mman.h>
22#include <asm/tlb.h>
23#include <asm/tlbflush.h>
24
25pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
26		      unsigned long sz)
27{
28	pgd_t *pgd;
29	pud_t *pud;
30	pte_t *pte = NULL;
31
32	pgd = pgd_offset(mm, addr);
33	pud = pud_alloc(mm, pgd, addr);
34	if (pud)
35		pte = (pte_t *)pmd_alloc(mm, pud, addr);
36
37	return pte;
38}
39
40pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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
55int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
56{
57	return 0;
58}
59
60/*
61 * This function checks for proper alignment of input addr and len parameters.
62 */
63int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
64{
65	if (len & ~HPAGE_MASK)
66		return -EINVAL;
67	if (addr & ~HPAGE_MASK)
68		return -EINVAL;
69	return 0;
70}
71
72struct page *
73follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
74{
75	return ERR_PTR(-EINVAL);
76}
77
78int pmd_huge(pmd_t pmd)
79{
80	return (pmd_val(pmd) & _PAGE_HUGE) != 0;
81}
82
83int pud_huge(pud_t pud)
84{
85	return (pud_val(pud) & _PAGE_HUGE) != 0;
 
 
 
 
 
86}
87
88struct page *
89follow_huge_pmd(struct mm_struct *mm, unsigned long address,
90		pmd_t *pmd, int write)
91{
92	struct page *page;
93
94	page = pte_page(*(pte_t *)pmd);
95	if (page)
96		page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
97	return page;
98}

  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}