LXR linux/arch/mips/mm/hugetlbpage.c

   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
  54/*
  55 * This function checks for proper alignment of input addr and len parameters.
  56 */
  57int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
  58{
  59        if (len & ~HPAGE_MASK)
  60                return -EINVAL;
  61        if (addr & ~HPAGE_MASK)
  62                return -EINVAL;
  63        return 0;
  64}
  65
  66int pmd_huge(pmd_t pmd)
  67{
  68        return (pmd_val(pmd) & _PAGE_HUGE) != 0;
  69}
  70
  71int pud_huge(pud_t pud)
  72{
  73        return (pud_val(pud) & _PAGE_HUGE) != 0;
  74}
  75