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qemu-e2k/include/qemu/timer.h

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#ifndef QEMU_TIMER_H
#define QEMU_TIMER_H
#include "qemu/typedefs.h"
#include "qemu-common.h"
#include "qemu/notify.h"
/* timers */
#define SCALE_MS 1000000
#define SCALE_US 1000
#define SCALE_NS 1
/**
* QEMUClockType:
*
* The following clock types are available:
*
* @QEMU_CLOCK_REALTIME: Real time clock
*
* The real time clock should be used only for stuff which does not
* change the virtual machine state, as it is run even if the virtual
* machine is stopped. The real time clock has a frequency of 1000
* Hz.
*
* Formerly rt_clock
*
* @QEMU_CLOCK_VIRTUAL: virtual clock
*
* The virtual clock is only run during the emulation. It is stopped
* when the virtual machine is stopped. Virtual timers use a high
* precision clock, usually cpu cycles (use ticks_per_sec).
*
* Formerly vm_clock
*
* @QEMU_CLOCK_HOST: host clock
*
* The host clock should be use for device models that emulate accurate
* real time sources. It will continue to run when the virtual machine
* is suspended, and it will reflect system time changes the host may
* undergo (e.g. due to NTP). The host clock has the same precision as
* the virtual clock.
*
* Formerly host_clock
*/
typedef enum {
QEMU_CLOCK_REALTIME = 0,
QEMU_CLOCK_VIRTUAL = 1,
QEMU_CLOCK_HOST = 2,
QEMU_CLOCK_MAX
} QEMUClockType;
typedef struct QEMUClock QEMUClock;
typedef struct QEMUTimerList QEMUTimerList;
typedef void QEMUTimerCB(void *opaque);
struct QEMUTimer {
int64_t expire_time; /* in nanoseconds */
QEMUTimerList *timer_list;
QEMUTimerCB *cb;
void *opaque;
QEMUTimer *next;
int scale;
};
extern QEMUClock *qemu_clocks[QEMU_CLOCK_MAX];
/**
* qemu_clock_ptr:
* @type: type of clock
*
* Translate a clock type into a pointer to QEMUClock object.
*
* Returns: a pointer to the QEMUClock object
*/
static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
{
return qemu_clocks[type];
}
/* These three clocks are maintained here with separate variable
* names for compatibility only.
*/
#define rt_clock (qemu_clock_ptr(QEMU_CLOCK_REALTIME))
#define vm_clock (qemu_clock_ptr(QEMU_CLOCK_VIRTUAL))
#define host_clock (qemu_clock_ptr(QEMU_CLOCK_HOST))
int64_t qemu_get_clock_ns(QEMUClock *clock);
bool qemu_clock_has_timers(QEMUClock *clock);
bool qemu_clock_expired(QEMUClock *clock);
int64_t qemu_clock_deadline(QEMUClock *clock);
/**
* qemu_clock_deadline_ns:
* @clock: the clock to operate on
*
* Calculate the timeout of the earliest expiring timer
* in nanoseconds, or -1 if no timer is set to expire.
*
* Returns: time until expiry in nanoseconds or -1
*/
int64_t qemu_clock_deadline_ns(QEMUClock *clock);
/**
* qemu_clock_use_for_deadline:
* @clock: the clock to operate on
*
* Determine whether a clock should be used for deadline
* calculations. Some clocks, for instance vm_clock with
* use_icount set, do not count in nanoseconds. Such clocks
* are not used for deadline calculations, and are presumed
* to interrupt any poll using qemu_notify/aio_notify
* etc.
*
* Returns: true if the clock runs in nanoseconds and
* should be used for a deadline.
*/
bool qemu_clock_use_for_deadline(QEMUClock *clock);
/**
* qemu_clock_get_main_loop_timerlist:
* @clock: the clock to operate on
*
* Return the default timer list assocatiated with a clock.
*
* Returns: the default timer list
*/
QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClock *clock);
/**
* timerlist_new:
* @type: the clock type to associate with the timerlist
*
* Create a new timerlist associated with the clock of
* type @type.
*
* Returns: a pointer to the QEMUTimerList created
*/
QEMUTimerList *timerlist_new(QEMUClockType type);
/**
* timerlist_free:
* @timer_list: the timer list to free
*
* Frees a timer_list. It must have no active timers.
*/
void timerlist_free(QEMUTimerList *timer_list);
/**
* timerlist_has_timers:
* @timer_list: the timer list to operate on
*
* Determine whether a timer list has active timers
*
* Returns: true if the timer list has timers.
*/
bool timerlist_has_timers(QEMUTimerList *timer_list);
/**
* timerlist_expired:
* @timer_list: the timer list to operate on
*
* Determine whether a timer list has any timers which
* are expired.
*
* Returns: true if the timer list has timers which
* have expired.
*/
bool timerlist_expired(QEMUTimerList *timer_list);
/**
* timerlist_deadline:
* @timer_list: the timer list to operate on
*
* Determine the deadline for a timer_list. This is
* a legacy function which returns INT32_MAX if the
* timer list has no timers or if the earliest timer
* expires later than INT32_MAX nanoseconds away.
*
* Returns: the number of nanoseconds until the earliest
* timer expires or INT32_MAX in the situations listed
* above
*/
int64_t timerlist_deadline(QEMUTimerList *timer_list);
/**
* timerlist_deadline_ns:
* @timer_list: the timer list to operate on
*
* Determine the deadline for a timer_list, i.e.
* the number of nanoseconds until the first timer
* expires. Return -1 if there are no timers.
*
* Returns: the number of nanoseconds until the earliest
* timer expires -1 if none
*/
int64_t timerlist_deadline_ns(QEMUTimerList *timer_list);
/**
* timerlist_getclock:
* @timer_list: the timer list to operate on
*
* Determine the clock associated with a timer list.
*
* Returns: the clock associated with the timer list.
*/
QEMUClock *timerlist_get_clock(QEMUTimerList *timer_list);
/**
* timerlist_run_timers:
* @timer_list: the timer list to use
*
* Call all expired timers associated with the timer list.
*
* Returns: true if any timer expired
*/
bool timerlist_run_timers(QEMUTimerList *timer_list);
/**
* qemu_timeout_ns_to_ms:
* @ns: nanosecond timeout value
*
* Convert a nanosecond timeout value (or -1) to
* a millisecond value (or -1), always rounding up.
*
* Returns: millisecond timeout value
*/
int qemu_timeout_ns_to_ms(int64_t ns);
/**
* qemu_poll_ns:
* @fds: Array of file descriptors
* @nfds: number of file descriptors
* @timeout: timeout in nanoseconds
*
* Perform a poll like g_poll but with a timeout in nanoseconds.
* See g_poll documentation for further details.
*
* Returns: number of fds ready
*/
int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout);
void qemu_clock_enable(QEMUClock *clock, bool enabled);
void qemu_clock_warp(QEMUClock *clock);
void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier);
void qemu_unregister_clock_reset_notifier(QEMUClock *clock,
Notifier *notifier);
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
QEMUTimerCB *cb, void *opaque);
/**
* timer_init:
* @ts: the timer to be initialised
* @timer_list: the timer list to attach the timer to
* @scale: the scale value for the tiemr
* @cb: the callback to be called when the timer expires
* @opaque: the opaque pointer to be passed to the callback
*
* Initialise a new timer and associate it with @timer_list.
* The caller is responsible for allocating the memory.
*
* You need not call an explicit deinit call. Simply make
* sure it is not on a list with timer_del.
*/
void timer_init(QEMUTimer *ts,
QEMUTimerList *timer_list, int scale,
QEMUTimerCB *cb, void *opaque);
/**
* timer_new_tl:
* @timer_list: the timer list to attach the timer to
* @scale: the scale value for the tiemr
* @cb: the callback to be called when the timer expires
* @opaque: the opaque pointer to be passed to the callback
*
* Creeate a new timer and associate it with @timer_list.
* The memory is allocated by the function.
*
* This is not the preferred interface unless you know you
* are going to call timer_free. Use timer_init instead.
*
* Returns: a pointer to the timer
*/
static inline QEMUTimer *timer_new_tl(QEMUTimerList *timer_list,
int scale,
QEMUTimerCB *cb,
void *opaque)
{
QEMUTimer *ts = g_malloc0(sizeof(QEMUTimer));
timer_init(ts, timer_list, scale, cb, opaque);
return ts;
}
void qemu_free_timer(QEMUTimer *ts);
void qemu_del_timer(QEMUTimer *ts);
void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time);
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
bool timer_pending(QEMUTimer *ts);
bool timer_expired(QEMUTimer *timer_head, int64_t current_time);
uint64_t timer_expire_time_ns(QEMUTimer *ts);
/* New format calling conventions for timers */
/**
* timer_free:
* @ts: the timer
*
* Free a timer (it must not be on the active list)
*/
static inline void timer_free(QEMUTimer *ts)
{
qemu_free_timer(ts);
}
/**
* timer_del:
* @ts: the timer
*
* Delete a timer from the active list.
*/
static inline void timer_del(QEMUTimer *ts)
{
qemu_del_timer(ts);
}
/**
* timer_mod_ns:
* @ts: the timer
* @expire_time: the expiry time in nanoseconds
*
* Modify a timer to expire at @expire_time
*/
static inline void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
{
qemu_mod_timer_ns(ts, expire_time);
}
/**
* timer_mod:
* @ts: the timer
* @expire_time: the expire time in the units associated with the timer
*
* Modify a timer to expiry at @expire_time, taking into
* account the scale associated with the timer.
*/
static inline void timer_mod(QEMUTimer *ts, int64_t expire_timer)
{
qemu_mod_timer(ts, expire_timer);
}
/**
* qemu_run_timers:
* @clock: clock on which to operate
*
* Run all the timers associated with the default timer list
* of a clock.
*
* Returns: true if any timer ran.
*/
bool qemu_run_timers(QEMUClock *clock);
/**
* qemu_run_all_timers:
*
* Run all the timers associated with the default timer list
* of every clock.
*
* Returns: true if any timer ran.
*/
bool qemu_run_all_timers(void);
void configure_alarms(char const *opt);
void init_clocks(void);
int init_timer_alarm(void);
int64_t cpu_get_ticks(void);
void cpu_enable_ticks(void);
void cpu_disable_ticks(void);
/**
* qemu_soonest_timeout:
* @timeout1: first timeout in nanoseconds (or -1 for infinite)
* @timeout2: second timeout in nanoseconds (or -1 for infinite)
*
* Calculates the soonest of two timeout values. -1 means infinite, which
* is later than any other value.
*
* Returns: soonest timeout value in nanoseconds (or -1 for infinite)
*/
static inline int64_t qemu_soonest_timeout(int64_t timeout1, int64_t timeout2)
{
/* we can abuse the fact that -1 (which means infinite) is a maximal
* value when cast to unsigned. As this is disgusting, it's kept in
* one inline function.
*/
return ((uint64_t) timeout1 < (uint64_t) timeout2) ? timeout1 : timeout2;
}
/**
* qemu_new_timer_ns:
* @clock: the clock to associate with the timer
* @callback: the callback to call when the timer expires
* @opaque: the opaque pointer to pass to the callback
*
* Create a new timer with nanosecond scale on the default timer list
* associated with the clock.
*
* Returns: a pointer to the newly created timer
*/
static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb,
void *opaque)
{
return qemu_new_timer(clock, SCALE_NS, cb, opaque);
}
/**
* qemu_new_timer_us:
* @clock: the clock to associate with the timer
* @callback: the callback to call when the timer expires
* @opaque: the opaque pointer to pass to the callback
*
* Create a new timer with microsecond scale on the default timer list
* associated with the clock.
*
* Returns: a pointer to the newly created timer
*/
static inline QEMUTimer *qemu_new_timer_us(QEMUClock *clock,
QEMUTimerCB *cb,
void *opaque)
{
return qemu_new_timer(clock, SCALE_US, cb, opaque);
}
/**
* qemu_new_timer_ms:
* @clock: the clock to associate with the timer
* @callback: the callback to call when the timer expires
* @opaque: the opaque pointer to pass to the callback
*
* Create a new timer with millisecond scale on the default timer list
* associated with the clock.
*
* Returns: a pointer to the newly created timer
*/
static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock,
QEMUTimerCB *cb,
void *opaque)
{
return qemu_new_timer(clock, SCALE_MS, cb, opaque);
}
static inline int64_t qemu_get_clock_ms(QEMUClock *clock)
{
return qemu_get_clock_ns(clock) / SCALE_MS;
}
static inline int64_t get_ticks_per_sec(void)
{
return 1000000000LL;
}
/* real time host monotonic timer */
static inline int64_t get_clock_realtime(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
#ifdef _WIN32
extern int64_t clock_freq;
static inline int64_t get_clock(void)
{
LARGE_INTEGER ti;
QueryPerformanceCounter(&ti);
return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
}
#else
extern int use_rt_clock;
static inline int64_t get_clock(void)
{
#ifdef CLOCK_MONOTONIC
if (use_rt_clock) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000000000LL + ts.tv_nsec;
} else
#endif
{
/* XXX: using gettimeofday leads to problems if the date
changes, so it should be avoided. */
return get_clock_realtime();
}
}
#endif
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
/* icount */
int64_t cpu_get_icount(void);
int64_t cpu_get_clock(void);
/*******************************************/
/* host CPU ticks (if available) */
#if defined(_ARCH_PPC)
static inline int64_t cpu_get_real_ticks(void)
{
int64_t retval;
#ifdef _ARCH_PPC64
/* This reads timebase in one 64bit go and includes Cell workaround from:
http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
*/
__asm__ __volatile__ ("mftb %0\n\t"
"cmpwi %0,0\n\t"
"beq- $-8"
: "=r" (retval));
#else
/* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
unsigned long junk;
__asm__ __volatile__ ("mfspr %1,269\n\t" /* mftbu */
"mfspr %L0,268\n\t" /* mftb */
"mfspr %0,269\n\t" /* mftbu */
"cmpw %0,%1\n\t"
"bne $-16"
: "=r" (retval), "=r" (junk));
#endif
return retval;
}
#elif defined(__i386__)
static inline int64_t cpu_get_real_ticks(void)
{
int64_t val;
asm volatile ("rdtsc" : "=A" (val));
return val;
}
#elif defined(__x86_64__)
static inline int64_t cpu_get_real_ticks(void)
{
uint32_t low,high;
int64_t val;
asm volatile("rdtsc" : "=a" (low), "=d" (high));
val = high;
val <<= 32;
val |= low;
return val;
}
#elif defined(__hppa__)
static inline int64_t cpu_get_real_ticks(void)
{
int val;
asm volatile ("mfctl %%cr16, %0" : "=r"(val));
return val;
}
#elif defined(__ia64)
static inline int64_t cpu_get_real_ticks(void)
{
int64_t val;
asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory");
return val;
}
#elif defined(__s390__)
static inline int64_t cpu_get_real_ticks(void)
{
int64_t val;
asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc");
return val;
}
#elif defined(__sparc__)
static inline int64_t cpu_get_real_ticks (void)
{
#if defined(_LP64)
uint64_t rval;
asm volatile("rd %%tick,%0" : "=r"(rval));
return rval;
#else
/* We need an %o or %g register for this. For recent enough gcc
there is an "h" constraint for that. Don't bother with that. */
union {
uint64_t i64;
struct {
uint32_t high;
uint32_t low;
} i32;
} rval;
asm volatile("rd %%tick,%%g1; srlx %%g1,32,%0; mov %%g1,%1"
: "=r"(rval.i32.high), "=r"(rval.i32.low) : : "g1");
return rval.i64;
#endif
}
#elif defined(__mips__) && \
((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
/*
* binutils wants to use rdhwr only on mips32r2
* but as linux kernel emulate it, it's fine
* to use it.
*
*/
#define MIPS_RDHWR(rd, value) { \
__asm__ __volatile__ (".set push\n\t" \
".set mips32r2\n\t" \
"rdhwr %0, "rd"\n\t" \
".set pop" \
: "=r" (value)); \
}
static inline int64_t cpu_get_real_ticks(void)
{
/* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
uint32_t count;
static uint32_t cyc_per_count = 0;
if (!cyc_per_count) {
MIPS_RDHWR("$3", cyc_per_count);
}
MIPS_RDHWR("$2", count);
return (int64_t)(count * cyc_per_count);
}
#elif defined(__alpha__)
static inline int64_t cpu_get_real_ticks(void)
{
uint64_t cc;
uint32_t cur, ofs;
asm volatile("rpcc %0" : "=r"(cc));
cur = cc;
ofs = cc >> 32;
return cur - ofs;
}
#else
/* The host CPU doesn't have an easily accessible cycle counter.
Just return a monotonically increasing value. This will be
totally wrong, but hopefully better than nothing. */
static inline int64_t cpu_get_real_ticks (void)
{
static int64_t ticks = 0;
return ticks++;
}
#endif
#ifdef CONFIG_PROFILER
static inline int64_t profile_getclock(void)
{
return cpu_get_real_ticks();
}
extern int64_t qemu_time, qemu_time_start;
extern int64_t tlb_flush_time;
extern int64_t dev_time;
#endif
#endif
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