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  */
  37 extern void tlb_flush_all(void);
  38 extern void flush_tlb_mm(struct mm_struct *mm);
  39 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
  40 extern void flush_tlb_range(struct vm_area_struct *vma,
  41                                 unsigned long start, unsigned long end);
  42 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
  43 extern 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