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(QEMUClock *clock);
41 int64_t qemu_get_clock_ns(QEMUClock *clock);
42 void qemu_clock_enable(QEMUClock *clock, int enabled);
44 QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque);
45 void qemu_free_timer(QEMUTimer *ts);
46 void qemu_del_timer(QEMUTimer *ts);
47 void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
48 int qemu_timer_pending(QEMUTimer *ts);
49 int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
51 void qemu_run_all_timers(void);
52 int qemu_alarm_pending(void);
53 int64_t qemu_next_deadline(void);
54 void configure_alarms(char const *opt);
55 void configure_icount(const char *option);
56 int qemu_calculate_timeout(void);
57 void init_clocks(void);
58 int init_timer_alarm(void);
59 void quit_timers(void);
61 static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb,
64 assert(clock != rt_clock);
65 return qemu_new_timer(clock, cb, opaque);
68 static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock, QEMUTimerCB *cb,
71 assert(clock == rt_clock);
72 return qemu_new_timer(clock, cb, opaque);
75 static inline int64_t qemu_get_clock_ms(QEMUClock *clock)
77 return qemu_get_clock_ns(clock) / SCALE_MS;
80 static inline int64_t get_ticks_per_sec(void)
85 /* real time host monotonic timer */
86 static inline int64_t get_clock_realtime(void)
90 gettimeofday(&tv, NULL);
91 return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
94 /* Warning: don't insert tracepoints into these functions, they are
95 also used by simpletrace backend and tracepoints would cause
96 an infinite recursion! */
98 extern int64_t clock_freq;
100 static inline int64_t get_clock(void)
103 QueryPerformanceCounter(&ti);
104 return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
109 extern int use_rt_clock;
111 static inline int64_t get_clock(void)
113 #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
114 || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
117 clock_gettime(CLOCK_MONOTONIC, &ts);
118 return ts.tv_sec * 1000000000LL + ts.tv_nsec;
122 /* XXX: using gettimeofday leads to problems if the date
123 changes, so it should be avoided. */
124 return get_clock_realtime();
129 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
130 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
133 typedef struct ptimer_state ptimer_state;
134 typedef void (*ptimer_cb)(void *opaque);
136 ptimer_state *ptimer_init(QEMUBH *bh);
137 void ptimer_set_period(ptimer_state *s, int64_t period);
138 void ptimer_set_freq(ptimer_state *s, uint32_t freq);
139 void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload);
140 uint64_t ptimer_get_count(ptimer_state *s);
141 void ptimer_set_count(ptimer_state *s, uint64_t count);
142 void ptimer_run(ptimer_state *s, int oneshot);
143 void ptimer_stop(ptimer_state *s);
144 void qemu_put_ptimer(QEMUFile *f, ptimer_state *s);
145 void qemu_get_ptimer(QEMUFile *f, ptimer_state *s);
148 int64_t qemu_icount_round(int64_t count);
149 extern int64_t qemu_icount;
150 extern int use_icount;
151 extern int icount_time_shift;
152 extern int64_t qemu_icount_bias;
153 int64_t cpu_get_icount(void);
155 /*******************************************/
156 /* host CPU ticks (if available) */
158 #if defined(_ARCH_PPC)
160 static inline int64_t cpu_get_real_ticks(void)
164 /* This reads timebase in one 64bit go and includes Cell workaround from:
165 http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
167 __asm__ __volatile__ ("mftb %0\n\t"
172 /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
174 __asm__ __volatile__ ("mfspr %1,269\n\t" /* mftbu */
175 "mfspr %L0,268\n\t" /* mftb */
176 "mfspr %0,269\n\t" /* mftbu */
179 : "=r" (retval), "=r" (junk));
184 #elif defined(__i386__)
186 static inline int64_t cpu_get_real_ticks(void)
189 asm volatile ("rdtsc" : "=A" (val));
193 #elif defined(__x86_64__)
195 static inline int64_t cpu_get_real_ticks(void)
199 asm volatile("rdtsc" : "=a" (low), "=d" (high));
206 #elif defined(__hppa__)
208 static inline int64_t cpu_get_real_ticks(void)
211 asm volatile ("mfctl %%cr16, %0" : "=r"(val));
215 #elif defined(__ia64)
217 static inline int64_t cpu_get_real_ticks(void)
220 asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory");
224 #elif defined(__s390__)
226 static inline int64_t cpu_get_real_ticks(void)
229 asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc");
233 #elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
235 static inline int64_t cpu_get_real_ticks (void)
239 asm volatile("rd %%tick,%0" : "=r"(rval));
249 asm volatile("rd %%tick,%1; srlx %1,32,%0"
250 : "=r"(rval.i32.high), "=r"(rval.i32.low));
255 #elif defined(__mips__) && \
256 ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
258 * binutils wants to use rdhwr only on mips32r2
259 * but as linux kernel emulate it, it's fine
263 #define MIPS_RDHWR(rd, value) { \
264 __asm__ __volatile__ (".set push\n\t" \
265 ".set mips32r2\n\t" \
266 "rdhwr %0, "rd"\n\t" \
271 static inline int64_t cpu_get_real_ticks(void)
273 /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
275 static uint32_t cyc_per_count = 0;
277 if (!cyc_per_count) {
278 MIPS_RDHWR("$3", cyc_per_count);
281 MIPS_RDHWR("$2", count);
282 return (int64_t)(count * cyc_per_count);
285 #elif defined(__alpha__)
287 static inline int64_t cpu_get_real_ticks(void)
292 asm volatile("rpcc %0" : "=r"(cc));
299 /* The host CPU doesn't have an easily accessible cycle counter.
300 Just return a monotonically increasing value. This will be
301 totally wrong, but hopefully better than nothing. */
302 static inline int64_t cpu_get_real_ticks (void)
304 static int64_t ticks = 0;
310 /* Deterministic execution requires that IO only be performed on the last
311 instruction of a TB so that interrupts take effect immediately. */
312 static inline int can_do_io(CPUState *env)
317 /* If not executing code then assume we are ok. */
318 if (!env->current_tb)
321 return env->can_do_io != 0;
325 #ifdef CONFIG_PROFILER
326 static inline int64_t profile_getclock(void)
328 return cpu_get_real_ticks();
331 extern int64_t qemu_time, qemu_time_start;
332 extern int64_t tlb_flush_time;
333 extern int64_t dev_time;