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
46