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1.1 root 1: /******************************************************************************
2: * sched.h
3: *
4: * Scheduler state interactions
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) 2005, Keir Fraser <[email protected]>
25: */
26:
27: #ifndef __XEN_PUBLIC_SCHED_H__
28: #define __XEN_PUBLIC_SCHED_H__
29:
30: #include "event_channel.h"
31:
32: /*
33: * The prototype for this hypercall is:
34: * long sched_op(int cmd, void *arg)
35: * @cmd == SCHEDOP_??? (scheduler operation).
36: * @arg == Operation-specific extra argument(s), as described below.
37: *
38: * Versions of Xen prior to 3.0.2 provided only the following legacy version
39: * of this hypercall, supporting only the commands yield, block and shutdown:
40: * long sched_op(int cmd, unsigned long arg)
41: * @cmd == SCHEDOP_??? (scheduler operation).
42: * @arg == 0 (SCHEDOP_yield and SCHEDOP_block)
43: * == SHUTDOWN_* code (SCHEDOP_shutdown)
44: * This legacy version is available to new guests as sched_op_compat().
45: */
46:
47: /*
48: * Voluntarily yield the CPU.
49: * @arg == NULL.
50: */
51: #define SCHEDOP_yield 0
52:
53: /*
54: * Block execution of this VCPU until an event is received for processing.
55: * If called with event upcalls masked, this operation will atomically
56: * reenable event delivery and check for pending events before blocking the
57: * VCPU. This avoids a "wakeup waiting" race.
58: * @arg == NULL.
59: */
60: #define SCHEDOP_block 1
61:
62: /*
63: * Halt execution of this domain (all VCPUs) and notify the system controller.
64: * @arg == pointer to sched_shutdown structure.
65: */
66: #define SCHEDOP_shutdown 2
67: struct sched_shutdown {
68: unsigned int reason; /* SHUTDOWN_* */
69: };
70: typedef struct sched_shutdown sched_shutdown_t;
71: DEFINE_XEN_GUEST_HANDLE(sched_shutdown_t);
72:
73: /*
74: * Poll a set of event-channel ports. Return when one or more are pending. An
75: * optional timeout may be specified.
76: * @arg == pointer to sched_poll structure.
77: */
78: #define SCHEDOP_poll 3
79: struct sched_poll {
80: XEN_GUEST_HANDLE(evtchn_port_t) ports;
81: unsigned int nr_ports;
82: uint64_t timeout;
83: };
84: typedef struct sched_poll sched_poll_t;
85: DEFINE_XEN_GUEST_HANDLE(sched_poll_t);
86:
87: /*
88: * Declare a shutdown for another domain. The main use of this function is
89: * in interpreting shutdown requests and reasons for fully-virtualized
90: * domains. A para-virtualized domain may use SCHEDOP_shutdown directly.
91: * @arg == pointer to sched_remote_shutdown structure.
92: */
93: #define SCHEDOP_remote_shutdown 4
94: struct sched_remote_shutdown {
95: domid_t domain_id; /* Remote domain ID */
96: unsigned int reason; /* SHUTDOWN_xxx reason */
97: };
98: typedef struct sched_remote_shutdown sched_remote_shutdown_t;
99: DEFINE_XEN_GUEST_HANDLE(sched_remote_shutdown_t);
100:
101: /*
102: * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
103: * software to determine the appropriate action. For the most part, Xen does
104: * not care about the shutdown code.
105: */
106: #define SHUTDOWN_poweroff 0 /* Domain exited normally. Clean up and kill. */
107: #define SHUTDOWN_reboot 1 /* Clean up, kill, and then restart. */
108: #define SHUTDOWN_suspend 2 /* Clean up, save suspend info, kill. */
109: #define SHUTDOWN_crash 3 /* Tell controller we've crashed. */
110:
111: #endif /* __XEN_PUBLIC_SCHED_H__ */
112:
113: /*
114: * Local variables:
115: * mode: C
116: * c-set-style: "BSD"
117: * c-basic-offset: 4
118: * tab-width: 4
119: * indent-tabs-mode: nil
120: * End:
121: */
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