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 _ASM_X86_VMI_TIME_H 26#define _ASM_X86_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 */ 39extern 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 */ 49extern void __init vmi_time_init(void); 50extern unsigned long vmi_get_wallclock(void); 51extern int vmi_set_wallclock(unsigned long now); 52extern unsigned long long vmi_sched_clock(void); 53extern unsigned long vmi_tsc_khz(void); 54 55#ifdef CONFIG_X86_LOCAL_APIC 56extern void __devinit vmi_time_bsp_init(void); 57extern 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 /* _ASM_X86_VMI_TIME_H */ 99