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