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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__ */ |