/******************************************************************************
* balloon.h
*
* Xen balloon driver - enables returning/claiming memory to/from Xen.
*
* Copyright (c) 2003, B Dragovic
* Copyright (c) 2003-2004, M Williamson, K Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __XEN_BALLOON_H__
#define __XEN_BALLOON_H__
#include <linux/spinlock.h>
#if 0
/*
* Inform the balloon driver that it should allow some slop for device-driver
* memory activities.
*/
void balloon_update_driver_allowance(long delta);
/* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */
struct page **alloc_empty_pages_and_pagevec(int nr_pages);
void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages);
void balloon_release_driver_page(struct page *page);
/*
* Prevent the balloon driver from changing the memory reservation during
* a driver critical region.
*/
extern spinlock_t balloon_lock;
#define balloon_lock(__flags) spin_lock_irqsave(&balloon_lock, __flags)
#define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags)
#endif
#endif /* __XEN_BALLOON_H__ */
