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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/mm/hugetlbpage.c
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/*

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 * MIPS Huge TLB Page Support for Kernel.

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 2002, Rohit Seth <[email protected]>

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 * Copyright 2005, Embedded Alley Solutions, Inc.

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 * Matt Porter <[email protected]>

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 * Copyright (C) 2008, 2009 Cavium Networks, Inc.

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 */

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#include <linux/fs.h>

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#include <linux/mm.h>

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#include <linux/hugetlb.h>

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#include <linux/pagemap.h>

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#include <linux/err.h>

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#include <linux/sysctl.h>

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#include <asm/mman.h>

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#include <asm/tlb.h>

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#include <asm/tlbflush.h>

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pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,

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		      unsigned long addr, unsigned long sz)

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{

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	pgd_t *pgd;

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	p4d_t *p4d;

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	pud_t *pud;

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	pte_t *pte = NULL;

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	pgd = pgd_offset(mm, addr);

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	p4d = p4d_alloc(mm, pgd, addr);

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	pud = pud_alloc(mm, p4d, addr);

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	if (pud)

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		pte = (pte_t *)pmd_alloc(mm, pud, addr);

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	return pte;

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}

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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,

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		       unsigned long sz)

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{

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	pgd_t *pgd;

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	p4d_t *p4d;

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	pud_t *pud;

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	pmd_t *pmd = NULL;

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	pgd = pgd_offset(mm, addr);

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	if (pgd_present(*pgd)) {

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		p4d = p4d_offset(pgd, addr);

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		if (p4d_present(*p4d)) {

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			pud = pud_offset(p4d, addr);

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			if (pud_present(*pud))

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				pmd = pmd_offset(pud, addr);

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		}

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	}

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	return (pte_t *) pmd;

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}

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