tlbflush.h

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/*
 * TLB flush support for Hexagon
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef _ASM_TLBFLUSH_H
#define _ASM_TLBFLUSH_H

#include <linux/mm.h>
#include <asm/processor.h>

/*
 * TLB flushing -- in "SMP", these routines get defined to be the
 * ones from smp.c, else they are some local flavors.
 */

/*
 * These functions are commonly macros, but in the interests of
 * VM vs. native implementation and code size, we simply declare
 * the function prototypes here.
 */
extern void tlb_flush_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
extern void flush_tlb_range(struct vm_area_struct *vma,
                unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void flush_tlb_one(unsigned long);

/*
 * "This is called in munmap when we have freed up some page-table pages.
 * We don't need to do anything here..."
 *
 * The VM kernel doesn't walk page tables, and they are passed to the VMM
 * by logical address. There doesn't seem to be any possibility that they
 * could be referenced by the VM kernel based on a stale mapping, since
 * they would only be located by consulting the mm structure, and they
 * will have been purged from that structure by the munmap.  Seems like
 * a noop on HVM as well.
 */
#define flush_tlb_pgtables(mm, start, end)

#endif