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/* -*- Mode:C; c-basic-offset:4; tab-width:4; indent-tabs-mode:nil -*- */
/*
* vtm.h: virtual timer head file.
* Copyright (c) 2004, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. 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., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Yaozu Dong (Eddie Dong) (Eddie.dong@intel.com)
*/
#ifndef _VTM_H_
#define _VTM_H_
#include <xen/timer.h>
#include <xen/types.h>
#define MAX_JUMP_STEP (5000) /* 500ms, max jump step */
#define MIN_GUEST_RUNNING_TIME (0) /* 10ms for guest os to run */
#define ITV_VECTOR_MASK (0xff)
typedef struct vtime {
long vtm_offset; // guest ITC = host ITC + vtm_offset
uint64_t vtm_local_drift;
uint64_t last_itc;
uint64_t pending;
/*
* Local drift (temporary) after guest suspension
* In case of long jump amount of ITC after suspension,
* guest ITC = host ITC + vtm_offset - vtm_local_drift;
* so that the duration passed saw in guest ITC is limited to
* cfg_max_jump that will make all kind of device driver happy.
*/
// next all uses ITC tick as unit
uint64_t cfg_max_jump; // max jump within one time suspendsion
uint64_t cfg_min_grun; // min guest running time since last jump
// uint64_t latest_read_itc; // latest guest read ITC
struct timer vtm_timer;
// int triggered;
uint64_t guest_running_time; // guest running time since last switch
//uint64_t vtm_last_suspending_time;
//uint64_t switch_in_time;
//uint64_t switch_out_time;
//uint64_t itc_freq;
} vtime_t;
#define ITV_VECTOR(itv) (itv&0xff)
#define ITV_IRQ_MASK(itv) (itv&(1<<16))
#define VTM_FIRED(vtm) ((vtm)->triggered)
#endif /* _STATS_H_ */
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