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