| /****************************************************************************** |
| * 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__ */ |