decbe5b76b
Project standard source code has tabs converted to spaces and CRLF line endings. Other text files have CRLF line endings.
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
#ifndef QEMU_TIMER_H
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#define QEMU_TIMER_H
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#include "qemu/typedefs.h"
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#include "qemu-common.h"
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#define NANOSECONDS_PER_SECOND 1000000000LL
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/* timers */
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#define SCALE_MS 1000000
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#define SCALE_US 1000
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#define SCALE_NS 1
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/**
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* QEMUClockType:
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*
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* The following clock types are available:
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*
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* @QEMU_CLOCK_REALTIME: Real time clock
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*
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* The real time clock should be used only for stuff which does not
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* change the virtual machine state, as it is run even if the virtual
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* machine is stopped. The real time clock has a frequency of 1000
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* Hz.
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*
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* @QEMU_CLOCK_VIRTUAL: virtual clock
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*
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* The virtual clock is only run during the emulation. It is stopped
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* when the virtual machine is stopped. Virtual timers use a high
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* precision clock, usually cpu cycles (use ticks_per_sec).
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*
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* @QEMU_CLOCK_HOST: host clock
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*
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* The host clock should be use for device models that emulate accurate
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* real time sources. It will continue to run when the virtual machine
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* is suspended, and it will reflect system time changes the host may
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* undergo (e.g. due to NTP). The host clock has the same precision as
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* the virtual clock.
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*
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* @QEMU_CLOCK_VIRTUAL_RT: realtime clock used for icount warp
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*
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* Outside icount mode, this clock is the same as @QEMU_CLOCK_VIRTUAL.
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* In icount mode, this clock counts nanoseconds while the virtual
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* machine is running. It is used to increase @QEMU_CLOCK_VIRTUAL
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* while the CPUs are sleeping and thus not executing instructions.
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*/
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typedef enum {
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QEMU_CLOCK_REALTIME = 0,
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QEMU_CLOCK_VIRTUAL = 1,
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QEMU_CLOCK_HOST = 2,
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QEMU_CLOCK_VIRTUAL_RT = 3,
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QEMU_CLOCK_MAX
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} QEMUClockType;
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/*
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* QEMUClockType
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*/
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/*
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* qemu_clock_get_ns;
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* @type: the clock type
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*
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* Get the nanosecond value of a clock with
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* type @type
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*
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* Returns: the clock value in nanoseconds
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*/
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#if defined(__cplusplus)
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extern "C" {
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#endif
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int64_t qemu_clock_get_ns(QEMUClockType type);
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#if defined(__cplusplus)
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}
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#endif
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/**
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* qemu_clock_get_ms;
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* @type: the clock type
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*
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* Get the millisecond value of a clock with
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* type @type
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*
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* Returns: the clock value in milliseconds
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*/
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static inline int64_t qemu_clock_get_ms(QEMUClockType type)
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{
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return qemu_clock_get_ns(type) / SCALE_MS;
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}
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#endif
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