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/*
* VMI Time wrappers
*
* Copyright (C) 2006, VMware, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to dhecht@vmware.com
*
*/
#ifndef __VMI_TIME_H
#define __VMI_TIME_H
/*
* Raw VMI call indices for timer functions
*/
#define VMI_CALL_GetCycleFrequency 66
#define VMI_CALL_GetCycleCounter 67
#define VMI_CALL_SetAlarm 68
#define VMI_CALL_CancelAlarm 69
#define VMI_CALL_GetWallclockTime 70
#define VMI_CALL_WallclockUpdated 71
/* Cached VMI timer operations */
extern struct vmi_timer_ops {
u64 (*get_cycle_frequency)(void);
u64 (*get_cycle_counter)(int);
u64 (*get_wallclock)(void);
int (*wallclock_updated)(void);
void (*set_alarm)(u32 flags, u64 expiry, u64 period);
void (*cancel_alarm)(u32 flags);
} vmi_timer_ops;
/* Prototypes */
extern void __init vmi_time_init(void);
extern unsigned long vmi_get_wallclock(void);
extern int vmi_set_wallclock(unsigned long now);
extern unsigned long long vmi_get_sched_cycles(void);
extern unsigned long vmi_cpu_khz(void);
#ifdef CONFIG_X86_LOCAL_APIC
extern void __devinit vmi_time_bsp_init(void);
extern void __devinit vmi_time_ap_init(void);
#endif
/*
* When run under a hypervisor, a vcpu is always in one of three states:
* running, halted, or ready. The vcpu is in the 'running' state if it
* is executing. When the vcpu executes the halt interface, the vcpu
* enters the 'halted' state and remains halted until there is some work
* pending for the vcpu (e.g. an alarm expires, host I/O completes on
* behalf of virtual I/O). At this point, the vcpu enters the 'ready'
* state (waiting for the hypervisor to reschedule it). Finally, at any
* time when the vcpu is not in the 'running' state nor the 'halted'
* state, it is in the 'ready' state.
*
* Real time is advances while the vcpu is 'running', 'ready', or
* 'halted'. Stolen time is the time in which the vcpu is in the
* 'ready' state. Available time is the remaining time -- the vcpu is
* either 'running' or 'halted'.
*
* All three views of time are accessible through the VMI cycle
* counters.
*/
/* The cycle counters. */
#define VMI_CYCLES_REAL 0
#define VMI_CYCLES_AVAILABLE 1
#define VMI_CYCLES_STOLEN 2
/* The alarm interface 'flags' bits */
#define VMI_ALARM_COUNTERS 2
#define VMI_ALARM_COUNTER_MASK 0x000000ff
#define VMI_ALARM_WIRED_IRQ0 0x00000000
#define VMI_ALARM_WIRED_LVTT 0x00010000
#define VMI_ALARM_IS_ONESHOT 0x00000000
#define VMI_ALARM_IS_PERIODIC 0x00000100
#define CONFIG_VMI_ALARM_HZ 100
#endif
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