win-pvdrivers

view common/include/public/xen-compat.h @ 1106:2d392ecdd366

Fix race is xenvbd causing 30 second freeze under high load
author James Harper <james.harper@bendigoit.com.au>
date Tue Nov 11 23:08:11 2014 +1100 (2014-11-11)
parents 5712dede5a1b
children
line source
1 /******************************************************************************
2 * xen-compat.h
3 *
4 * Guest OS interface to Xen. Compatibility layer.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Copyright (c) 2006, Christian Limpach
25 */
27 #ifndef __XEN_PUBLIC_XEN_COMPAT_H__
28 #define __XEN_PUBLIC_XEN_COMPAT_H__
30 #define __XEN_LATEST_INTERFACE_VERSION__ 0x00030205
32 #if defined(__XEN__) || defined(__XEN_TOOLS__)
33 /* Xen is built with matching headers and implements the latest interface. */
34 #define __XEN_INTERFACE_VERSION__ __XEN_LATEST_INTERFACE_VERSION__
35 #elif !defined(__XEN_INTERFACE_VERSION__)
36 /* Guests which do not specify a version get the legacy interface. */
37 #define __XEN_INTERFACE_VERSION__ 0x00000000
38 #endif
40 #if __XEN_INTERFACE_VERSION__ > __XEN_LATEST_INTERFACE_VERSION__
41 #error "These header files do not support the requested interface version."
42 #endif
44 /* Fields defined as a Xen guest handle since 0x00030205. */
45 #if __XEN_INTERFACE_VERSION__ >= 0x00030205
46 #define XEN_GUEST_HANDLE_00030205(type) XEN_GUEST_HANDLE(type)
47 #else
48 #define XEN_GUEST_HANDLE_00030205(type) type *
49 #endif
51 #endif /* __XEN_PUBLIC_XEN_COMPAT_H__ */