root / qemu-timer.h @ 852f771e
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#ifndef QEMU_TIMER_H
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#define QEMU_TIMER_H
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#include "qemu-common.h" |
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#include <time.h> |
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#include <sys/time.h> |
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#ifdef _WIN32
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#include <windows.h> |
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#include <mmsystem.h> |
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#endif
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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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typedef struct QEMUClock QEMUClock; |
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typedef void QEMUTimerCB(void *opaque); |
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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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extern QEMUClock *rt_clock;
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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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extern QEMUClock *vm_clock;
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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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extern QEMUClock *host_clock;
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int64_t qemu_get_clock_ns(QEMUClock *clock); |
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void qemu_clock_enable(QEMUClock *clock, int enabled); |
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void qemu_clock_warp(QEMUClock *clock);
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QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
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QEMUTimerCB *cb, void *opaque);
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void qemu_free_timer(QEMUTimer *ts);
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void qemu_del_timer(QEMUTimer *ts);
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void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
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int qemu_timer_pending(QEMUTimer *ts);
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int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
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void qemu_run_all_timers(void); |
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int qemu_alarm_pending(void); |
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int64_t qemu_next_icount_deadline(void);
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void configure_alarms(char const *opt); |
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void configure_icount(const char *option); |
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int qemu_calculate_timeout(void); |
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void init_clocks(void); |
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int init_timer_alarm(void); |
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void quit_timers(void); |
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int64_t cpu_get_ticks(void);
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void cpu_enable_ticks(void); |
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void cpu_disable_ticks(void); |
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static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb, |
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void *opaque)
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{ |
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return qemu_new_timer(clock, SCALE_NS, cb, opaque);
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} |
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static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock, QEMUTimerCB *cb, |
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void *opaque)
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{ |
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return qemu_new_timer(clock, SCALE_MS, cb, opaque);
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} |
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static inline int64_t qemu_get_clock_ms(QEMUClock *clock) |
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{ |
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return qemu_get_clock_ns(clock) / SCALE_MS;
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} |
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static inline int64_t get_ticks_per_sec(void) |
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{ |
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return 1000000000LL; |
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} |
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/* real time host monotonic timer */
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static inline int64_t get_clock_realtime(void) |
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{ |
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); |
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} |
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/* Warning: don't insert tracepoints into these functions, they are
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also used by simpletrace backend and tracepoints would cause
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an infinite recursion! */
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#ifdef _WIN32
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extern int64_t clock_freq;
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static inline int64_t get_clock(void) |
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{ |
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LARGE_INTEGER ti; |
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QueryPerformanceCounter(&ti); |
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return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
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} |
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#else
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extern int use_rt_clock; |
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static inline int64_t get_clock(void) |
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{ |
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ |
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|| defined(__DragonFly__) || defined(__FreeBSD_kernel__) |
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if (use_rt_clock) {
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec * 1000000000LL + ts.tv_nsec; |
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} else
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#endif
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{ |
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/* XXX: using gettimeofday leads to problems if the date
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changes, so it should be avoided. */
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return get_clock_realtime();
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} |
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} |
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#endif
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void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
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void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
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/* ptimer.c */
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typedef struct ptimer_state ptimer_state; |
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typedef void (*ptimer_cb)(void *opaque); |
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ptimer_state *ptimer_init(QEMUBH *bh); |
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void ptimer_set_period(ptimer_state *s, int64_t period);
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void ptimer_set_freq(ptimer_state *s, uint32_t freq);
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void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload); |
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uint64_t ptimer_get_count(ptimer_state *s); |
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void ptimer_set_count(ptimer_state *s, uint64_t count);
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void ptimer_run(ptimer_state *s, int oneshot); |
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void ptimer_stop(ptimer_state *s);
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/* icount */
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int64_t qemu_icount_round(int64_t count); |
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extern int64_t qemu_icount;
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extern int use_icount; |
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extern int icount_time_shift; |
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extern int64_t qemu_icount_bias;
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int64_t cpu_get_icount(void);
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/*******************************************/
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/* host CPU ticks (if available) */
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#if defined(_ARCH_PPC)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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int64_t retval; |
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#ifdef _ARCH_PPC64
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/* This reads timebase in one 64bit go and includes Cell workaround from:
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http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
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*/
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__asm__ __volatile__ ("mftb %0\n\t"
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"cmpwi %0,0\n\t"
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"beq- $-8"
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: "=r" (retval));
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#else
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/* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
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unsigned long junk; |
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__asm__ __volatile__ ("mfspr %1,269\n\t" /* mftbu */ |
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"mfspr %L0,268\n\t" /* mftb */ |
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"mfspr %0,269\n\t" /* mftbu */ |
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"cmpw %0,%1\n\t"
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"bne $-16"
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: "=r" (retval), "=r" (junk)); |
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#endif
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return retval;
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} |
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#elif defined(__i386__)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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int64_t val; |
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asm volatile ("rdtsc" : "=A" (val)); |
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return val;
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} |
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#elif defined(__x86_64__)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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uint32_t low,high; |
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int64_t val; |
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asm volatile("rdtsc" : "=a" (low), "=d" (high)); |
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val = high; |
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val <<= 32;
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val |= low; |
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return val;
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} |
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#elif defined(__hppa__)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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int val;
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asm volatile ("mfctl %%cr16, %0" : "=r"(val)); |
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return val;
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} |
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#elif defined(__ia64)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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int64_t val; |
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asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory"); |
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return val;
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} |
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#elif defined(__s390__)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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int64_t val; |
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asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc"); |
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return val;
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} |
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#elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
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static inline int64_t cpu_get_real_ticks (void) |
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{ |
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#if defined(_LP64)
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uint64_t rval; |
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asm volatile("rd %%tick,%0" : "=r"(rval)); |
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return rval;
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#else
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union {
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uint64_t i64; |
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struct {
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uint32_t high; |
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uint32_t low; |
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} i32; |
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} rval; |
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asm volatile("rd %%tick,%1; srlx %1,32,%0" |
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: "=r"(rval.i32.high), "=r"(rval.i32.low)); |
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return rval.i64;
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#endif
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} |
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#elif defined(__mips__) && \
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((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
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/*
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* binutils wants to use rdhwr only on mips32r2
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* but as linux kernel emulate it, it's fine
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* to use it.
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*
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*/
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#define MIPS_RDHWR(rd, value) { \
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__asm__ __volatile__ (".set push\n\t" \
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".set mips32r2\n\t" \
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"rdhwr %0, "rd"\n\t" \ |
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".set pop" \
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: "=r" (value)); \
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} |
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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/* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
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uint32_t count; |
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static uint32_t cyc_per_count = 0; |
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if (!cyc_per_count) {
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MIPS_RDHWR("$3", cyc_per_count);
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} |
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MIPS_RDHWR("$2", count);
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return (int64_t)(count * cyc_per_count);
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} |
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#elif defined(__alpha__)
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static inline int64_t cpu_get_real_ticks(void) |
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{ |
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uint64_t cc; |
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uint32_t cur, ofs; |
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asm volatile("rpcc %0" : "=r"(cc)); |
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cur = cc; |
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ofs = cc >> 32;
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return cur - ofs;
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} |
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#else
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/* The host CPU doesn't have an easily accessible cycle counter.
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Just return a monotonically increasing value. This will be
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totally wrong, but hopefully better than nothing. */
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static inline int64_t cpu_get_real_ticks (void) |
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{ |
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static int64_t ticks = 0; |
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return ticks++;
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} |
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#endif
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#ifdef NEED_CPU_H
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/* Deterministic execution requires that IO only be performed on the last
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instruction of a TB so that interrupts take effect immediately. */
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static inline int can_do_io(CPUState *env) |
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{ |
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if (!use_icount)
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return 1; |
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/* If not executing code then assume we are ok. */
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if (!env->current_tb)
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return 1; |
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return env->can_do_io != 0; |
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} |
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#endif
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#ifdef CONFIG_PROFILER
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static inline int64_t profile_getclock(void) |
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{ |
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return cpu_get_real_ticks();
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} |
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extern int64_t qemu_time, qemu_time_start;
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extern int64_t tlb_flush_time;
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extern int64_t dev_time;
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#endif
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#endif
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