311 lines
8.2 KiB
C
311 lines
8.2 KiB
C
#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 "qemu/main-loop.h"
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#include "qemu/notify.h"
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#ifdef __FreeBSD__
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#include <sys/param.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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int64_t qemu_clock_has_timers(QEMUClock *clock);
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int64_t qemu_clock_expired(QEMUClock *clock);
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int64_t qemu_clock_deadline(QEMUClock *clock);
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void qemu_clock_enable(QEMUClock *clock, bool enabled);
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void qemu_clock_warp(QEMUClock *clock);
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void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier);
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void qemu_unregister_clock_reset_notifier(QEMUClock *clock,
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Notifier *notifier);
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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_ns(QEMUTimer *ts, int64_t expire_time);
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void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
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bool qemu_timer_pending(QEMUTimer *ts);
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bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
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uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts);
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void qemu_run_timers(QEMUClock *clock);
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void qemu_run_all_timers(void);
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void configure_alarms(char const *opt);
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void init_clocks(void);
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int init_timer_alarm(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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/* icount */
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int64_t cpu_get_icount(void);
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int64_t cpu_get_clock(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__)
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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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/* We need an %o or %g register for this. For recent enough gcc
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there is an "h" constraint for that. Don't bother with that. */
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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,%%g1; srlx %%g1,32,%0; mov %%g1,%1"
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: "=r"(rval.i32.high), "=r"(rval.i32.low) : : "g1");
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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 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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