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

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * TLB flush support for Hexagon
   4 *
   5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   6 */
   7
   8#ifndef _ASM_TLBFLUSH_H
   9#define _ASM_TLBFLUSH_H
  10
  11#include <linux/mm.h>
  12#include <asm/processor.h>
  13
  14/*
  15 * TLB flushing -- in "SMP", these routines get defined to be the
  16 * ones from smp.c, else they are some local flavors.
  17 */
  18
  19/*
  20 * These functions are commonly macros, but in the interests of
  21 * VM vs. native implementation and code size, we simply declare
  22 * the function prototypes here.
  23 */
  24extern void tlb_flush_all(void);
  25extern void flush_tlb_mm(struct mm_struct *mm);
  26extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
  27extern void flush_tlb_range(struct vm_area_struct *vma,
  28                                unsigned long start, unsigned long end);
  29extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
  30extern void flush_tlb_one(unsigned long);
  31
  32/*
  33 * "This is called in munmap when we have freed up some page-table pages.
  34 * We don't need to do anything here..."
  35 *
  36 * The VM kernel doesn't walk page tables, and they are passed to the VMM
  37 * by logical address. There doesn't seem to be any possibility that they
  38 * could be referenced by the VM kernel based on a stale mapping, since
  39 * they would only be located by consulting the mm structure, and they
  40 * will have been purged from that structure by the munmap.  Seems like
  41 * a noop on HVM as well.
  42 */
  43#define flush_tlb_pgtables(mm, start, end)
  44
  45#endif
  46