Linux Kernel  3.7.1
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tlbflush.h
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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