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