Richard Kuo | 5df87c1 | 2011-10-31 18:52:00 -0500 | [diff] [blame] | 1 | /* |
| 2 | * TLB flush support for Hexagon |
| 3 | * |
| 4 | * Copyright (c) 2010-2011, Code Aurora Forum. 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 |