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| 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 |
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