include/asm-i386/vmi_time.h

   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);
  52 extern unsigned long long vmi_get_sched_cycles(void);
  53 extern unsigned long vmi_cpu_khz(void);
  54
  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);
  59 #endif
  60
  61 #ifdef CONFIG_NO_IDLE_HZ
  62 extern int vmi_stop_hz_timer(void);
  63 extern void vmi_account_time_restart_hz_timer(void);
  64 #else
  65 static inline int vmi_stop_hz_timer(void)
  66 {
  67         return 0;
  68 }
  69 static inline void vmi_account_time_restart_hz_timer(void)
  70 {
  71 }
  72 #endif
  73
  74 /*
  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.
  84  *
  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'.
  89  *
  90  * All three views of time are accessible through the VMI cycle
  91  * counters.
  92  */
  93
  94 /* The cycle counters. */
  95 #define VMI_CYCLES_REAL         0
  96 #define VMI_CYCLES_AVAILABLE    1
  97 #define VMI_CYCLES_STOLEN       2
  98
  99 /* The alarm interface 'flags' bits */
 100 #define VMI_ALARM_COUNTERS      2
 101
 102 #define VMI_ALARM_COUNTER_MASK  0x000000ff
 103
 104 #define VMI_ALARM_WIRED_IRQ0    0x00000000
 105 #define VMI_ALARM_WIRED_LVTT    0x00010000
 106
 107 #define VMI_ALARM_IS_ONESHOT    0x00000000
 108 #define VMI_ALARM_IS_PERIODIC   0x00000100
 109
 110 #define CONFIG_VMI_ALARM_HZ     100
 111
 112 #endif