forked from Minki/linux
1182d8528b
In order to share the common code in tsc.c which does CPU Khz calibration, we need to make an accurate value of CPU speed available to the tsc.c code. This value loses a lot of precision in a VM because of the timing differences with real hardware, but we need it to be as precise as possible so the guest can make accurate time calculations with the cycle counters. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
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* VMI Time wrappers
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*
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* Copyright (C) 2006, VMware, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to dhecht@vmware.com
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*
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*/
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#ifndef __VMI_TIME_H
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#define __VMI_TIME_H
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/*
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* Raw VMI call indices for timer functions
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*/
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#define VMI_CALL_GetCycleFrequency 66
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#define VMI_CALL_GetCycleCounter 67
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#define VMI_CALL_SetAlarm 68
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#define VMI_CALL_CancelAlarm 69
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#define VMI_CALL_GetWallclockTime 70
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#define VMI_CALL_WallclockUpdated 71
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/* Cached VMI timer operations */
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extern struct vmi_timer_ops {
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u64 (*get_cycle_frequency)(void);
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u64 (*get_cycle_counter)(int);
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u64 (*get_wallclock)(void);
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int (*wallclock_updated)(void);
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void (*set_alarm)(u32 flags, u64 expiry, u64 period);
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void (*cancel_alarm)(u32 flags);
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} vmi_timer_ops;
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/* Prototypes */
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extern void __init vmi_time_init(void);
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extern unsigned long vmi_get_wallclock(void);
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extern int vmi_set_wallclock(unsigned long now);
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extern unsigned long long vmi_get_sched_cycles(void);
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extern unsigned long vmi_cpu_khz(void);
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#ifdef CONFIG_X86_LOCAL_APIC
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extern void __init vmi_timer_setup_boot_alarm(void);
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extern void __init vmi_timer_setup_secondary_alarm(void);
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extern void apic_vmi_timer_interrupt(void);
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#endif
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#ifdef CONFIG_NO_IDLE_HZ
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extern int vmi_stop_hz_timer(void);
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extern void vmi_account_time_restart_hz_timer(void);
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#endif
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/*
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* When run under a hypervisor, a vcpu is always in one of three states:
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* running, halted, or ready. The vcpu is in the 'running' state if it
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* is executing. When the vcpu executes the halt interface, the vcpu
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* enters the 'halted' state and remains halted until there is some work
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* pending for the vcpu (e.g. an alarm expires, host I/O completes on
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* behalf of virtual I/O). At this point, the vcpu enters the 'ready'
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* state (waiting for the hypervisor to reschedule it). Finally, at any
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* time when the vcpu is not in the 'running' state nor the 'halted'
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* state, it is in the 'ready' state.
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*
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* Real time is advances while the vcpu is 'running', 'ready', or
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* 'halted'. Stolen time is the time in which the vcpu is in the
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* 'ready' state. Available time is the remaining time -- the vcpu is
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* either 'running' or 'halted'.
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*
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* All three views of time are accessible through the VMI cycle
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* counters.
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*/
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/* The cycle counters. */
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#define VMI_CYCLES_REAL 0
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#define VMI_CYCLES_AVAILABLE 1
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#define VMI_CYCLES_STOLEN 2
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/* The alarm interface 'flags' bits */
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#define VMI_ALARM_COUNTERS 2
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#define VMI_ALARM_COUNTER_MASK 0x000000ff
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#define VMI_ALARM_WIRED_IRQ0 0x00000000
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#define VMI_ALARM_WIRED_LVTT 0x00010000
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#define VMI_ALARM_IS_ONESHOT 0x00000000
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#define VMI_ALARM_IS_PERIODIC 0x00000100
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#define CONFIG_VMI_ALARM_HZ 100
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#endif
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