4 * Copyright (C) 2006, VMware, Inc.
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.
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
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.
21 * Send feedback to dhecht@vmware.com
29 * Raw VMI call indices for timer functions
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
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);
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_get_sched_cycles(void);
53 extern unsigned long vmi_cpu_khz(void);
55 #ifdef CONFIG_X86_LOCAL_APIC
56 extern void __init vmi_timer_setup_boot_alarm(void);
57 extern void __devinit vmi_timer_setup_secondary_alarm(void);
58 extern void apic_vmi_timer_interrupt(void);
61 #ifdef CONFIG_NO_IDLE_HZ
62 extern int vmi_stop_hz_timer(void);
63 extern void vmi_account_time_restart_hz_timer(void);
65 static inline int vmi_stop_hz_timer(void)
69 static inline void vmi_account_time_restart_hz_timer(void)
75 * When run under a hypervisor, a vcpu is always in one of three states:
76 * running, halted, or ready. The vcpu is in the 'running' state if it
77 * is executing. When the vcpu executes the halt interface, the vcpu
78 * enters the 'halted' state and remains halted until there is some work
79 * pending for the vcpu (e.g. an alarm expires, host I/O completes on
80 * behalf of virtual I/O). At this point, the vcpu enters the 'ready'
81 * state (waiting for the hypervisor to reschedule it). Finally, at any
82 * time when the vcpu is not in the 'running' state nor the 'halted'
83 * state, it is in the 'ready' state.
85 * Real time is advances while the vcpu is 'running', 'ready', or
86 * 'halted'. Stolen time is the time in which the vcpu is in the
87 * 'ready' state. Available time is the remaining time -- the vcpu is
88 * either 'running' or 'halted'.
90 * All three views of time are accessible through the VMI cycle
94 /* The cycle counters. */
95 #define VMI_CYCLES_REAL 0
96 #define VMI_CYCLES_AVAILABLE 1
97 #define VMI_CYCLES_STOLEN 2
99 /* The alarm interface 'flags' bits */
100 #define VMI_ALARM_COUNTERS 2
102 #define VMI_ALARM_COUNTER_MASK 0x000000ff
104 #define VMI_ALARM_WIRED_IRQ0 0x00000000
105 #define VMI_ALARM_WIRED_LVTT 0x00010000
107 #define VMI_ALARM_IS_ONESHOT 0x00000000
108 #define VMI_ALARM_IS_PERIODIC 0x00000100
110 #define CONFIG_VMI_ALARM_HZ 100