| Jeremy Fitzhardinge | 1775826 | 2008-04-02 10:54:13 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * balloon.h |
| 3 | * |
| 4 | * Xen balloon driver - enables returning/claiming memory to/from Xen. |
| 5 | * |
| 6 | * Copyright (c) 2003, B Dragovic |
| 7 | * Copyright (c) 2003-2004, M Williamson, K Fraser |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation; or, when distributed |
| 12 | * separately from the Linux kernel or incorporated into other |
| 13 | * software packages, subject to the following license: |
| 14 | * |
| 15 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 16 | * of this source file (the "Software"), to deal in the Software without |
| 17 | * restriction, including without limitation the rights to use, copy, modify, |
| 18 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 19 | * and to permit persons to whom the Software is furnished to do so, subject to |
| 20 | * the following conditions: |
| 21 | * |
| 22 | * The above copyright notice and this permission notice shall be included in |
| 23 | * all copies or substantial portions of the Software. |
| 24 | * |
| 25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 28 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 29 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 30 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 31 | * IN THE SOFTWARE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef __XEN_BALLOON_H__ |
| 35 | #define __XEN_BALLOON_H__ |
| 36 | |
| 37 | #include <linux/spinlock.h> |
| 38 | |
| 39 | #if 0 |
| 40 | /* |
| 41 | * Inform the balloon driver that it should allow some slop for device-driver |
| 42 | * memory activities. |
| 43 | */ |
| 44 | void balloon_update_driver_allowance(long delta); |
| 45 | |
| 46 | /* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */ |
| 47 | struct page **alloc_empty_pages_and_pagevec(int nr_pages); |
| 48 | void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages); |
| 49 | |
| 50 | void balloon_release_driver_page(struct page *page); |
| 51 | |
| 52 | /* |
| 53 | * Prevent the balloon driver from changing the memory reservation during |
| 54 | * a driver critical region. |
| 55 | */ |
| 56 | extern spinlock_t balloon_lock; |
| 57 | #define balloon_lock(__flags) spin_lock_irqsave(&balloon_lock, __flags) |
| 58 | #define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags) |
| 59 | #endif |
| 60 | |
| 61 | #endif /* __XEN_BALLOON_H__ */ |