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62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
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/******************************************************************************
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* balloon.h
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*
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* Xen balloon driver - enables returning/claiming memory to/from Xen.
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*
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* Copyright (c) 2003, B Dragovic
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* Copyright (c) 2003-2004, M Williamson, K Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __XEN_BALLOON_H__
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#define __XEN_BALLOON_H__
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#include <linux/spinlock.h>
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#if 0
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/*
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* Inform the balloon driver that it should allow some slop for device-driver
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* memory activities.
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*/
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void balloon_update_driver_allowance(long delta);
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/* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */
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struct page **alloc_empty_pages_and_pagevec(int nr_pages);
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void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages);
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void balloon_release_driver_page(struct page *page);
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/*
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* Prevent the balloon driver from changing the memory reservation during
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* a driver critical region.
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*/
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extern spinlock_t balloon_lock;
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#define balloon_lock(__flags) spin_lock_irqsave(&balloon_lock, __flags)
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#define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags)
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#endif
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#endif /* __XEN_BALLOON_H__ */
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