1 /*
2 * VMI Time wrappers
3 *
4 * Copyright (C) 2006, VMware, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * Send feedback to dhecht@vmware.com
22 *
23 */
24
25 #ifndef __VMI_TIME_H
26 #define __VMI_TIME_H
27
28 /*
29 * Raw VMI call indices for timer functions
30 */
31 #define VMI_CALL_GetCycleFrequency 66
32 #define VMI_CALL_GetCycleCounter 67
33 #define VMI_CALL_SetAlarm 68
34 #define VMI_CALL_CancelAlarm 69
35 #define VMI_CALL_GetWallclockTime 70
36 #define VMI_CALL_WallclockUpdated 71
37
38 /* Cached VMI timer operations */
39 extern struct vmi_timer_ops {
40 u64 (*get_cycle_frequency)(void);
41 u64 (*get_cycle_counter)(int);
42 u64 (*get_wallclock)(void);
43 int (*wallclock_updated)(void);
44 void (*set_alarm)(u32 flags, u64 expiry, u64 period);
45 void (*cancel_alarm)(u32 flags);
46 } vmi_timer_ops;
47
48 /* Prototypes */
49 extern void __init vmi_time_init(void);
50 extern unsigned long vmi_get_wallclock(void);
51 extern int vmi_set_wallclock(unsigned long now);
52 extern unsigned long long vmi_sched_clock(void);
53 extern unsigned long vmi_cpu_khz(void);
54
55 #ifdef CONFIG_X86_LOCAL_APIC
56 extern void __devinit vmi_time_bsp_init(void);
57 extern void __devinit vmi_time_ap_init(void);
58 #endif
59
60 /*
61 * When run under a hypervisor, a vcpu is always in one of three states:
62 * running, halted, or ready. The vcpu is in the 'running' state if it
63 * is executing. When the vcpu executes the halt interface, the vcpu
64 * enters the 'halted' state and remains halted until there is some work
65 * pending for the vcpu (e.g. an alarm expires, host I/O completes on
66 * behalf of virtual I/O). At this point, the vcpu enters the 'ready'
67 * state (waiting for the hypervisor to reschedule it). Finally, at any
68 * time when the vcpu is not in the 'running' state nor the 'halted'
69 * state, it is in the 'ready' state.
70 *
71 * Real time is advances while the vcpu is 'running', 'ready', or
72 * 'halted'. Stolen time is the time in which the vcpu is in the
73 * 'ready' state. Available time is the remaining time -- the vcpu is
74 * either 'running' or 'halted'.
75 *
76 * All three views of time are accessible through the VMI cycle
77 * counters.
78 */
79
80 /* The cycle counters. */
81 #define VMI_CYCLES_REAL 0
82 #define VMI_CYCLES_AVAILABLE 1
83 #define VMI_CYCLES_STOLEN 2
84
85 /* The alarm interface 'flags' bits */
86 #define VMI_ALARM_COUNTERS 2
87
88 #define VMI_ALARM_COUNTER_MASK 0x000000ff
89
90 #define VMI_ALARM_WIRED_IRQ0 0x00000000
91 #define VMI_ALARM_WIRED_LVTT 0x00010000
92
93 #define VMI_ALARM_IS_ONESHOT 0x00000000
94 #define VMI_ALARM_IS_PERIODIC 0x00000100
95
96 #define CONFIG_VMI_ALARM_HZ 100
97
98 #endif
99
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