2 * MIPS Huge TLB Page Support for Kernel.
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
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.
14 #include <linux/init.h>
17 #include <linux/hugetlb.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/err.h>
21 #include <linux/sysctl.h>
24 #include <asm/tlbflush.h>
26 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
33 pgd = pgd_offset(mm, addr);
34 pud = pud_alloc(mm, pgd, addr);
36 pte = (pte_t *)pmd_alloc(mm, pud, addr);
41 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
47 pgd = pgd_offset(mm, addr);
48 if (pgd_present(*pgd)) {
49 pud = pud_offset(pgd, addr);
50 if (pud_present(*pud))
51 pmd = pmd_offset(pud, addr);
56 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
62 * This function checks for proper alignment of input addr and len parameters.
64 int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
66 if (len & ~HPAGE_MASK)
68 if (addr & ~HPAGE_MASK)
74 follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
76 return ERR_PTR(-EINVAL);
79 int pmd_huge(pmd_t pmd)
81 return (pmd_val(pmd) & _PAGE_HUGE) != 0;
84 int pud_huge(pud_t pud)
86 return (pud_val(pud) & _PAGE_HUGE) != 0;
90 follow_huge_pmd(struct mm_struct *mm, unsigned long address,
91 pmd_t *pmd, int write)
95 page = pte_page(*(pte_t *)pmd);
97 page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);