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/*
* CPU timers state API
*
* Copyright 2020 SUSE LLC
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#ifndef SYSEMU_CPU_TIMERS_H
#define SYSEMU_CPU_TIMERS_H
#include "qemu/timer.h"
/* init the whole cpu timers API, including icount, ticks, and cpu_throttle */
void cpu_timers_init(void);
/* icount - Instruction Counter API */
/**
* ICountMode: icount enablement state:
*
* @ICOUNT_DISABLED: Disabled - Do not count executed instructions.
* @ICOUNT_PRECISE: Enabled - Fixed conversion of insn to ns via "shift" option
* @ICOUNT_ADAPTATIVE: Enabled - Runtime adaptive algorithm to compute shift
*/
typedef enum {
ICOUNT_DISABLED = 0,
ICOUNT_PRECISE,
ICOUNT_ADAPTATIVE,
} ICountMode;
#if defined(CONFIG_TCG) && !defined(CONFIG_USER_ONLY)
extern ICountMode use_icount;
#define icount_enabled() (use_icount)
#else
#define icount_enabled() ICOUNT_DISABLED
#endif
/*
* Update the icount with the executed instructions. Called by
* cpus-tcg vCPU thread so the main-loop can see time has moved forward.
*/
void icount_update(CPUState *cpu);
/* get raw icount value */
int64_t icount_get_raw(void);
/* return the virtual CPU time in ns, based on the instruction counter. */
int64_t icount_get(void);
/*
* convert an instruction counter value to ns, based on the icount shift.
* This shift is set as a fixed value with the icount "shift" option
* (precise mode), or it is constantly approximated and corrected at
* runtime in adaptive mode.
*/
int64_t icount_to_ns(int64_t icount);
/**
* icount_configure: configure the icount options, including "shift"
* @opts: Options to parse
* @errp: pointer to a NULL-initialized error object
*
* Return: true on success, else false setting @errp with error
*/
bool icount_configure(QemuOpts *opts, Error **errp);
/* used by tcg vcpu thread to calc icount budget */
int64_t icount_round(int64_t count);
/* if the CPUs are idle, start accounting real time to virtual clock. */
void icount_start_warp_timer(void);
void icount_account_warp_timer(void);
void icount_notify_exit(void);
/*
* CPU Ticks and Clock
*/
/* Caller must hold BQL */
void cpu_enable_ticks(void);
/* Caller must hold BQL */
void cpu_disable_ticks(void);
/*
* return the time elapsed in VM between vm_start and vm_stop.
* cpu_get_ticks() uses units of the host CPU cycle counter.
*/
int64_t cpu_get_ticks(void);
/*
* Returns the monotonic time elapsed in VM, i.e.,
* the time between vm_start and vm_stop
*/
int64_t cpu_get_clock(void);
void qemu_timer_notify_cb(void *opaque, QEMUClockType type);
/* get/set VIRTUAL clock and VM elapsed ticks via the cpus accel interface */
int64_t cpus_get_virtual_clock(void);
void cpus_set_virtual_clock(int64_t new_time);
int64_t cpus_get_elapsed_ticks(void);
#endif /* SYSEMU_CPU_TIMERS_H */
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