cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hugetlbpage.c (1523B)

      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, struct vm_area_struct *vma,
     25		      unsigned long addr, unsigned long sz)
     26{
     27	pgd_t *pgd;
     28	p4d_t *p4d;
     29	pud_t *pud;
     30	pte_t *pte = NULL;
     31
     32	pgd = pgd_offset(mm, addr);
     33	p4d = p4d_alloc(mm, pgd, addr);
     34	pud = pud_alloc(mm, p4d, addr);
     35	if (pud)
     36		pte = (pte_t *)pmd_alloc(mm, pud, addr);
     37
     38	return pte;
     39}
     40
     41pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
     42		       unsigned long sz)
     43{
     44	pgd_t *pgd;
     45	p4d_t *p4d;
     46	pud_t *pud;
     47	pmd_t *pmd = NULL;
     48
     49	pgd = pgd_offset(mm, addr);
     50	if (pgd_present(*pgd)) {
     51		p4d = p4d_offset(pgd, addr);
     52		if (p4d_present(*p4d)) {
     53			pud = pud_offset(p4d, addr);
     54			if (pud_present(*pud))
     55				pmd = pmd_offset(pud, addr);
     56		}
     57	}
     58	return (pte_t *) pmd;
     59}
     60
     61int pmd_huge(pmd_t pmd)
     62{
     63	return (pmd_val(pmd) & _PAGE_HUGE) != 0;
     64}
     65
     66int pud_huge(pud_t pud)
     67{
     68	return (pud_val(pud) & _PAGE_HUGE) != 0;
     69}