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aa380c82 JF |
1 | /****************************************************************************** |
2 | * callback.h | |
3 | * | |
4 | * Register guest OS callbacks with Xen. | |
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, Ian Campbell | |
25 | */ | |
26 | ||
27 | #ifndef __XEN_PUBLIC_CALLBACK_H__ | |
28 | #define __XEN_PUBLIC_CALLBACK_H__ | |
29 | ||
30 | #include "xen.h" | |
31 | ||
32 | /* | |
33 | * Prototype for this hypercall is: | |
34 | * long callback_op(int cmd, void *extra_args) | |
35 | * @cmd == CALLBACKOP_??? (callback operation). | |
36 | * @extra_args == Operation-specific extra arguments (NULL if none). | |
37 | */ | |
38 | ||
39 | /* ia64, x86: Callback for event delivery. */ | |
40 | #define CALLBACKTYPE_event 0 | |
41 | ||
42 | /* x86: Failsafe callback when guest state cannot be restored by Xen. */ | |
43 | #define CALLBACKTYPE_failsafe 1 | |
44 | ||
45 | /* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */ | |
46 | #define CALLBACKTYPE_syscall 2 | |
47 | ||
48 | /* | |
49 | * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel | |
50 | * feature is enabled. Do not use this callback type in new code. | |
51 | */ | |
52 | #define CALLBACKTYPE_sysenter_deprecated 3 | |
53 | ||
54 | /* x86: Callback for NMI delivery. */ | |
55 | #define CALLBACKTYPE_nmi 4 | |
56 | ||
57 | /* | |
58 | * x86: sysenter is only available as follows: | |
59 | * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled | |
60 | * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs | |
61 | * ('32-on-32-on-64', '32-on-64-on-64') | |
62 | * [nb. also 64-bit guest applications on Intel CPUs | |
63 | * ('64-on-64-on-64'), but syscall is preferred] | |
64 | */ | |
65 | #define CALLBACKTYPE_sysenter 5 | |
66 | ||
67 | /* | |
68 | * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs | |
69 | * ('32-on-32-on-64', '32-on-64-on-64') | |
70 | */ | |
71 | #define CALLBACKTYPE_syscall32 7 | |
72 | ||
73 | /* | |
74 | * Disable event deliver during callback? This flag is ignored for event and | |
75 | * NMI callbacks: event delivery is unconditionally disabled. | |
76 | */ | |
77 | #define _CALLBACKF_mask_events 0 | |
78 | #define CALLBACKF_mask_events (1U << _CALLBACKF_mask_events) | |
79 | ||
80 | /* | |
81 | * Register a callback. | |
82 | */ | |
83 | #define CALLBACKOP_register 0 | |
84 | struct callback_register { | |
48b5db20 JF |
85 | uint16_t type; |
86 | uint16_t flags; | |
87 | xen_callback_t address; | |
aa380c82 JF |
88 | }; |
89 | ||
90 | /* | |
91 | * Unregister a callback. | |
92 | * | |
93 | * Not all callbacks can be unregistered. -EINVAL will be returned if | |
94 | * you attempt to unregister such a callback. | |
95 | */ | |
96 | #define CALLBACKOP_unregister 1 | |
97 | struct callback_unregister { | |
98 | uint16_t type; | |
99 | uint16_t _unused; | |
100 | }; | |
101 | ||
102 | #endif /* __XEN_PUBLIC_CALLBACK_H__ */ |