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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); | |
688340ea | 52 | extern unsigned long long vmi_sched_clock(void); |
1182d852 | 53 | extern unsigned long vmi_cpu_khz(void); |
bbab4f3b ZA |
54 | |
55 | #ifdef CONFIG_X86_LOCAL_APIC | |
e0bb8643 ZA |
56 | extern void __devinit vmi_time_bsp_init(void); |
57 | extern void __devinit vmi_time_ap_init(void); | |
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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 |