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 59