LXR linux/arch/hexagon/include/asm/tlbflush.h

   1/*
   2 * TLB flush support for Hexagon
   3 *
   4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 and
   8 * only version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 * 02110-1301, USA.
  19 */
  20
  21#ifndef _ASM_TLBFLUSH_H
  22#define _ASM_TLBFLUSH_H
  23
  24#include <linux/mm.h>
  25#include <asm/processor.h>
  26
  27/*
  28 * TLB flushing -- in "SMP", these routines get defined to be the
  29 * ones from smp.c, else they are some local flavors.
  30 */
  31
  32/*
  33 * These functions are commonly macros, but in the interests of
  34 * VM vs. native implementation and code size, we simply declare
  35 * the function prototypes here.
  36 */
  37extern void tlb_flush_all(void);
  38extern void flush_tlb_mm(struct mm_struct *mm);
  39extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
  40extern void flush_tlb_range(struct vm_area_struct *vma,
  41                                unsigned long start, unsigned long end);
  42extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
  43extern void flush_tlb_one(unsigned long);
  44
  45/*
  46 * "This is called in munmap when we have freed up some page-table pages.
  47 * We don't need to do anything here..."
  48 *
  49 * The VM kernel doesn't walk page tables, and they are passed to the VMM
  50 * by logical address. There doesn't seem to be any possibility that they
  51 * could be referenced by the VM kernel based on a stale mapping, since
  52 * they would only be located by consulting the mm structure, and they
  53 * will have been purged from that structure by the munmap.  Seems like
  54 * a noop on HVM as well.
  55 */
  56#define flush_tlb_pgtables(mm, start, end)
  57
  58#endif
  59