4 #include "qemu-common.h"
15 #define SCALE_MS 1000000
19 typedef struct QEMUClock QEMUClock
;
20 typedef void QEMUTimerCB(void *opaque
);
22 /* The real time clock should be used only for stuff which does not
23 change the virtual machine state, as it is run even if the virtual
24 machine is stopped. The real time clock has a frequency of 1000
26 extern QEMUClock
*rt_clock
;
28 /* The virtual clock is only run during the emulation. It is stopped
29 when the virtual machine is stopped. Virtual timers use a high
30 precision clock, usually cpu cycles (use ticks_per_sec). */
31 extern QEMUClock
*vm_clock
;
33 /* The host clock should be use for device models that emulate accurate
34 real time sources. It will continue to run when the virtual machine
35 is suspended, and it will reflect system time changes the host may
36 undergo (e.g. due to NTP). The host clock has the same precision as
38 extern QEMUClock
*host_clock
;
40 int64_t qemu_get_clock_ns(QEMUClock
*clock
);
41 int64_t qemu_clock_has_timers(QEMUClock
*clock
);
42 int64_t qemu_clock_expired(QEMUClock
*clock
);
43 int64_t qemu_clock_deadline(QEMUClock
*clock
);
44 void qemu_clock_enable(QEMUClock
*clock
, int enabled
);
45 void qemu_clock_warp(QEMUClock
*clock
);
47 void qemu_register_clock_reset_notifier(QEMUClock
*clock
, Notifier
*notifier
);
48 void qemu_unregister_clock_reset_notifier(QEMUClock
*clock
,
51 QEMUTimer
*qemu_new_timer(QEMUClock
*clock
, int scale
,
52 QEMUTimerCB
*cb
, void *opaque
);
53 void qemu_free_timer(QEMUTimer
*ts
);
54 void qemu_del_timer(QEMUTimer
*ts
);
55 void qemu_mod_timer(QEMUTimer
*ts
, int64_t expire_time
);
56 int qemu_timer_pending(QEMUTimer
*ts
);
57 int qemu_timer_expired(QEMUTimer
*timer_head
, int64_t current_time
);
59 void qemu_run_all_timers(void);
60 int qemu_alarm_pending(void);
61 void configure_alarms(char const *opt
);
62 int qemu_calculate_timeout(void);
63 void init_clocks(void);
64 int init_timer_alarm(void);
66 int64_t cpu_get_ticks(void);
67 void cpu_enable_ticks(void);
68 void cpu_disable_ticks(void);
70 static inline QEMUTimer
*qemu_new_timer_ns(QEMUClock
*clock
, QEMUTimerCB
*cb
,
73 return qemu_new_timer(clock
, SCALE_NS
, cb
, opaque
);
76 static inline QEMUTimer
*qemu_new_timer_ms(QEMUClock
*clock
, QEMUTimerCB
*cb
,
79 return qemu_new_timer(clock
, SCALE_MS
, cb
, opaque
);
82 static inline int64_t qemu_get_clock_ms(QEMUClock
*clock
)
84 return qemu_get_clock_ns(clock
) / SCALE_MS
;
87 static inline int64_t get_ticks_per_sec(void)
92 /* real time host monotonic timer */
93 static inline int64_t get_clock_realtime(void)
97 gettimeofday(&tv
, NULL
);
98 return tv
.tv_sec
* 1000000000LL + (tv
.tv_usec
* 1000);
101 /* Warning: don't insert tracepoints into these functions, they are
102 also used by simpletrace backend and tracepoints would cause
103 an infinite recursion! */
105 extern int64_t clock_freq
;
107 static inline int64_t get_clock(void)
110 QueryPerformanceCounter(&ti
);
111 return muldiv64(ti
.QuadPart
, get_ticks_per_sec(), clock_freq
);
116 extern int use_rt_clock
;
118 static inline int64_t get_clock(void)
120 #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
121 || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
124 clock_gettime(CLOCK_MONOTONIC
, &ts
);
125 return ts
.tv_sec
* 1000000000LL + ts
.tv_nsec
;
129 /* XXX: using gettimeofday leads to problems if the date
130 changes, so it should be avoided. */
131 return get_clock_realtime();
136 void qemu_get_timer(QEMUFile
*f
, QEMUTimer
*ts
);
137 void qemu_put_timer(QEMUFile
*f
, QEMUTimer
*ts
);
140 typedef struct ptimer_state ptimer_state
;
141 typedef void (*ptimer_cb
)(void *opaque
);
143 ptimer_state
*ptimer_init(QEMUBH
*bh
);
144 void ptimer_set_period(ptimer_state
*s
, int64_t period
);
145 void ptimer_set_freq(ptimer_state
*s
, uint32_t freq
);
146 void ptimer_set_limit(ptimer_state
*s
, uint64_t limit
, int reload
);
147 uint64_t ptimer_get_count(ptimer_state
*s
);
148 void ptimer_set_count(ptimer_state
*s
, uint64_t count
);
149 void ptimer_run(ptimer_state
*s
, int oneshot
);
150 void ptimer_stop(ptimer_state
*s
);
153 int64_t cpu_get_icount(void);
154 int64_t cpu_get_clock(void);
156 /*******************************************/
157 /* host CPU ticks (if available) */
159 #if defined(_ARCH_PPC)
161 static inline int64_t cpu_get_real_ticks(void)
165 /* This reads timebase in one 64bit go and includes Cell workaround from:
166 http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
168 __asm__
__volatile__ ("mftb %0\n\t"
173 /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
175 __asm__
__volatile__ ("mfspr %1,269\n\t" /* mftbu */
176 "mfspr %L0,268\n\t" /* mftb */
177 "mfspr %0,269\n\t" /* mftbu */
180 : "=r" (retval
), "=r" (junk
));
185 #elif defined(__i386__)
187 static inline int64_t cpu_get_real_ticks(void)
190 asm volatile ("rdtsc" : "=A" (val
));
194 #elif defined(__x86_64__)
196 static inline int64_t cpu_get_real_ticks(void)
200 asm volatile("rdtsc" : "=a" (low
), "=d" (high
));
207 #elif defined(__hppa__)
209 static inline int64_t cpu_get_real_ticks(void)
212 asm volatile ("mfctl %%cr16, %0" : "=r"(val
));
216 #elif defined(__ia64)
218 static inline int64_t cpu_get_real_ticks(void)
221 asm volatile ("mov %0 = ar.itc" : "=r"(val
) :: "memory");
225 #elif defined(__s390__)
227 static inline int64_t cpu_get_real_ticks(void)
230 asm volatile("stck 0(%1)" : "=m" (val
) : "a" (&val
) : "cc");
234 #elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
236 static inline int64_t cpu_get_real_ticks (void)
240 asm volatile("rd %%tick,%0" : "=r"(rval
));
250 asm volatile("rd %%tick,%1; srlx %1,32,%0"
251 : "=r"(rval
.i32
.high
), "=r"(rval
.i32
.low
));
256 #elif defined(__mips__) && \
257 ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
259 * binutils wants to use rdhwr only on mips32r2
260 * but as linux kernel emulate it, it's fine
264 #define MIPS_RDHWR(rd, value) { \
265 __asm__ __volatile__ (".set push\n\t" \
266 ".set mips32r2\n\t" \
267 "rdhwr %0, "rd"\n\t" \
272 static inline int64_t cpu_get_real_ticks(void)
274 /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
276 static uint32_t cyc_per_count
= 0;
278 if (!cyc_per_count
) {
279 MIPS_RDHWR("$3", cyc_per_count
);
282 MIPS_RDHWR("$2", count
);
283 return (int64_t)(count
* cyc_per_count
);
286 #elif defined(__alpha__)
288 static inline int64_t cpu_get_real_ticks(void)
293 asm volatile("rpcc %0" : "=r"(cc
));
300 /* The host CPU doesn't have an easily accessible cycle counter.
301 Just return a monotonically increasing value. This will be
302 totally wrong, but hopefully better than nothing. */
303 static inline int64_t cpu_get_real_ticks (void)
305 static int64_t ticks
= 0;
310 #ifdef CONFIG_PROFILER
311 static inline int64_t profile_getclock(void)
313 return cpu_get_real_ticks();
316 extern int64_t qemu_time
, qemu_time_start
;
317 extern int64_t tlb_flush_time
;
318 extern int64_t dev_time
;