/****************************************************************************** * 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__ */