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  */
  24 extern void tlb_flush_all(void);
  25 extern void flush_tlb_mm(struct mm_struct *mm);
  26 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
  27 extern void flush_tlb_range(struct vm_area_struct *vma,
  28                                 unsigned long start, unsigned long end);
  29 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
  30 extern 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