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Diffstat (limited to 'src/include/qemu/timer.h')
| -rw-r--r-- | src/include/qemu/timer.h | 1021 |
1 files changed, 1021 insertions, 0 deletions
diff --git a/src/include/qemu/timer.h b/src/include/qemu/timer.h new file mode 100644 index 0000000..a16effa --- /dev/null +++ b/src/include/qemu/timer.h @@ -0,0 +1,1021 @@ +#ifndef QEMU_TIMER_H +#define QEMU_TIMER_H + +#include "qemu/typedefs.h" +#include "qemu-common.h" +#include "qemu/notify.h" +#include "qemu/host-utils.h" + +#define NANOSECONDS_PER_SECOND 1000000000LL + +/* 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. + * + * @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). + * + * @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. + * + * @QEMU_CLOCK_VIRTUAL_RT: realtime clock used for icount warp + * + * Outside icount mode, this clock is the same as @QEMU_CLOCK_VIRTUAL. + * In icount mode, this clock counts nanoseconds while the virtual + * machine is running. It is used to increase @QEMU_CLOCK_VIRTUAL + * while the CPUs are sleeping and thus not executing instructions. + */ + +typedef enum { + QEMU_CLOCK_REALTIME = 0, + QEMU_CLOCK_VIRTUAL = 1, + QEMU_CLOCK_HOST = 2, + QEMU_CLOCK_VIRTUAL_RT = 3, + QEMU_CLOCK_MAX +} QEMUClockType; + +typedef struct QEMUTimerList QEMUTimerList; + +struct QEMUTimerListGroup { + QEMUTimerList *tl[QEMU_CLOCK_MAX]; +}; + +typedef void QEMUTimerCB(void *opaque); +typedef void QEMUTimerListNotifyCB(void *opaque); + +struct QEMUTimer { + int64_t expire_time; /* in nanoseconds */ + QEMUTimerList *timer_list; + QEMUTimerCB *cb; + void *opaque; + QEMUTimer *next; + int scale; +}; + +extern QEMUTimerListGroup main_loop_tlg; + +/* + * QEMUClockType + */ + +/* + * qemu_clock_get_ns; + * @type: the clock type + * + * Get the nanosecond value of a clock with + * type @type + * + * Returns: the clock value in nanoseconds + */ +int64_t qemu_clock_get_ns(QEMUClockType type); + +/** + * qemu_clock_get_ms; + * @type: the clock type + * + * Get the millisecond value of a clock with + * type @type + * + * Returns: the clock value in milliseconds + */ +static inline int64_t qemu_clock_get_ms(QEMUClockType type) +{ + return qemu_clock_get_ns(type) / SCALE_MS; +} + +/** + * qemu_clock_get_us; + * @type: the clock type + * + * Get the microsecond value of a clock with + * type @type + * + * Returns: the clock value in microseconds + */ +static inline int64_t qemu_clock_get_us(QEMUClockType type) +{ + return qemu_clock_get_ns(type) / SCALE_US; +} + +/** + * qemu_clock_has_timers: + * @type: the clock type + * + * Determines whether a clock's default timer list + * has timers attached + * + * Note that this function should not be used when other threads also access + * the timer list. The return value may be outdated by the time it is acted + * upon. + * + * Returns: true if the clock's default timer list + * has timers attached + */ +bool qemu_clock_has_timers(QEMUClockType type); + +/** + * qemu_clock_expired: + * @type: the clock type + * + * Determines whether a clock's default timer list + * has an expired clock. + * + * Returns: true if the clock's default timer list has + * an expired timer + */ +bool qemu_clock_expired(QEMUClockType type); + +/** + * qemu_clock_use_for_deadline: + * @type: the clock type + * + * 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(QEMUClockType type); + +/** + * qemu_clock_deadline_ns_all: + * @type: the clock type + * + * Calculate the deadline across all timer lists associated + * with a clock (as opposed to just the default one) + * 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_all(QEMUClockType type); + +/** + * qemu_clock_get_main_loop_timerlist: + * @type: the clock type + * + * Return the default timer list assocatiated with a clock. + * + * Returns: the default timer list + */ +QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type); + +/** + * qemu_clock_nofify: + * @type: the clock type + * + * Call the notifier callback connected with the default timer + * list linked to the clock, or qemu_notify() if none. + */ +void qemu_clock_notify(QEMUClockType type); + +/** + * qemu_clock_enable: + * @type: the clock type + * @enabled: true to enable, false to disable + * + * Enable or disable a clock + * Disabling the clock will wait for related timerlists to stop + * executing qemu_run_timers. Thus, this functions should not + * be used from the callback of a timer that is based on @clock. + * Doing so would cause a deadlock. + * + * Caller should hold BQL. + */ +void qemu_clock_enable(QEMUClockType type, bool enabled); + +/** + * qemu_clock_warp: + * @type: the clock type + * + * Warp a clock to a new value + */ +void qemu_clock_warp(QEMUClockType type); + +/** + * qemu_clock_register_reset_notifier: + * @type: the clock type + * @notifier: the notifier function + * + * Register a notifier function to call when the clock + * concerned is reset. + */ +void qemu_clock_register_reset_notifier(QEMUClockType type, + Notifier *notifier); + +/** + * qemu_clock_unregister_reset_notifier: + * @type: the clock type + * @notifier: the notifier function + * + * Unregister a notifier function to call when the clock + * concerned is reset. + */ +void qemu_clock_unregister_reset_notifier(QEMUClockType type, + Notifier *notifier); + +/** + * qemu_clock_run_timers: + * @type: 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_clock_run_timers(QEMUClockType type); + +/** + * qemu_clock_run_all_timers: + * + * Run all the timers associated with the default timer list + * of every clock. + * + * Returns: true if any timer ran. + */ +bool qemu_clock_run_all_timers(void); + +/* + * QEMUTimerList + */ + +/** + * timerlist_new: + * @type: the clock type to associate with the timerlist + * @cb: the callback to call on notification + * @opaque: the opaque pointer to pass to the callback + * + * Create a new timerlist associated with the clock of + * type @type. + * + * Returns: a pointer to the QEMUTimerList created + */ +QEMUTimerList *timerlist_new(QEMUClockType type, + QEMUTimerListNotifyCB *cb, void *opaque); + +/** + * 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 + * + * Note that this function should not be used when other threads also access + * the timer list. The return value may be outdated by the time it is acted + * upon. + * + * 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_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_get_clock: + * @timer_list: the timer list to operate on + * + * Determine the clock type associated with a timer list. + * + * Returns: the clock type associated with the + * timer list. + */ +QEMUClockType 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); + +/** + * timerlist_notify: + * @timer_list: the timer list to use + * + * call the notifier callback associated with the timer list. + */ +void timerlist_notify(QEMUTimerList *timer_list); + +/* + * QEMUTimerListGroup + */ + +/** + * timerlistgroup_init: + * @tlg: the timer list group + * @cb: the callback to call when a notify is required + * @opaque: the opaque pointer to be passed to the callback. + * + * Initialise a timer list group. This must already be + * allocated in memory and zeroed. The notifier callback is + * called whenever a clock in the timer list group is + * reenabled or whenever a timer associated with any timer + * list is modified. If @cb is specified as null, qemu_notify() + * is used instead. + */ +void timerlistgroup_init(QEMUTimerListGroup *tlg, + QEMUTimerListNotifyCB *cb, void *opaque); + +/** + * timerlistgroup_deinit: + * @tlg: the timer list group + * + * Deinitialise a timer list group. This must already be + * initialised. Note the memory is not freed. + */ +void timerlistgroup_deinit(QEMUTimerListGroup *tlg); + +/** + * timerlistgroup_run_timers: + * @tlg: the timer list group + * + * Run the timers associated with a timer list group. + * This will run timers on multiple clocks. + * + * Returns: true if any timer callback ran + */ +bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg); + +/** + * timerlistgroup_deadline_ns: + * @tlg: the timer list group + * + * Determine the deadline of the soonest timer to + * expire associated with any timer list linked to + * the timer list group. Only clocks suitable for + * deadline calculation are included. + * + * Returns: the deadline in nanoseconds or -1 if no + * timers are to expire. + */ +int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg); + +/* + * QEMUTimer + */ + +/** + * timer_init_tl: + * @ts: the timer to be initialised + * @timer_list: the timer list to attach the timer to + * @scale: the scale value for the timer + * @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_tl(QEMUTimer *ts, + QEMUTimerList *timer_list, int scale, + QEMUTimerCB *cb, void *opaque); + +/** + * timer_init: + * @type: the clock to associate with the timer + * @scale: the scale value for the timer + * @cb: the callback to call when the timer expires + * @opaque: the opaque pointer to pass to the callback + * + * Initialize a timer with the given scale on the default timer list + * associated with the clock. + * + * You need not call an explicit deinit call. Simply make + * sure it is not on a list with timer_del. + */ +static inline void timer_init(QEMUTimer *ts, QEMUClockType type, int scale, + QEMUTimerCB *cb, void *opaque) +{ + timer_init_tl(ts, main_loop_tlg.tl[type], scale, cb, opaque); +} + +/** + * timer_init_ns: + * @type: the clock to associate with the timer + * @cb: the callback to call when the timer expires + * @opaque: the opaque pointer to pass to the callback + * + * Initialize a timer with nanosecond scale on the default timer list + * associated with the clock. + * + * You need not call an explicit deinit call. Simply make + * sure it is not on a list with timer_del. + */ +static inline void timer_init_ns(QEMUTimer *ts, QEMUClockType type, + QEMUTimerCB *cb, void *opaque) +{ + timer_init(ts, type, SCALE_NS, cb, opaque); +} + +/** + * timer_init_us: + * @type: the clock to associate with the timer + * @cb: the callback to call when the timer expires + * @opaque: the opaque pointer to pass to the callback + * + * Initialize a timer with microsecond scale on the default timer list + * associated with the clock. + * + * You need not call an explicit deinit call. Simply make + * sure it is not on a list with timer_del. + */ +static inline void timer_init_us(QEMUTimer *ts, QEMUClockType type, + QEMUTimerCB *cb, void *opaque) +{ + timer_init(ts, type, SCALE_US, cb, opaque); +} + +/** + * timer_init_ms: + * @type: the clock to associate with the timer + * @cb: the callback to call when the timer expires + * @opaque: the opaque pointer to pass to the callback + * + * Initialize a timer with millisecond scale on the default timer list + * associated with the clock. + * + * You need not call an explicit deinit call. Simply make + * sure it is not on a list with timer_del. + */ +static inline void timer_init_ms(QEMUTimer *ts, QEMUClockType type, + QEMUTimerCB *cb, void *opaque) +{ + timer_init(ts, type, SCALE_MS, cb, opaque); +} + +/** + * timer_new_tl: + * @timer_list: the timer list to attach the timer to + * @scale: the scale value for the timer + * @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 = (QEMUTimer *)g_malloc0(sizeof(QEMUTimer)); + timer_init_tl(ts, timer_list, scale, cb, opaque); + return ts; +} + +/** + * timer_new: + * @type: the clock type to use + * @scale: the scale value for the timer + * @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 the default + * timer list for the clock type @type. + * + * Returns: a pointer to the timer + */ +static inline QEMUTimer *timer_new(QEMUClockType type, int scale, + QEMUTimerCB *cb, void *opaque) +{ + return timer_new_tl(main_loop_tlg.tl[type], scale, cb, opaque); +} + +/** + * timer_new_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 *timer_new_ns(QEMUClockType type, QEMUTimerCB *cb, + void *opaque) +{ + return timer_new(type, SCALE_NS, cb, opaque); +} + +/** + * timer_new_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 *timer_new_us(QEMUClockType type, QEMUTimerCB *cb, + void *opaque) +{ + return timer_new(type, SCALE_US, cb, opaque); +} + +/** + * timer_new_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 *timer_new_ms(QEMUClockType type, QEMUTimerCB *cb, + void *opaque) +{ + return timer_new(type, SCALE_MS, cb, opaque); +} + +/** + * timer_deinit: + * @ts: the timer to be de-initialised + * + * Deassociate the timer from any timerlist. You should + * call timer_del before. After this call, any further + * timer_del call cannot cause dangling pointer accesses + * even if the previously used timerlist is freed. + */ +void timer_deinit(QEMUTimer *ts); + +/** + * timer_free: + * @ts: the timer + * + * Free a timer (it must not be on the active list) + */ +void timer_free(QEMUTimer *ts); + +/** + * timer_del: + * @ts: the timer + * + * Delete a timer from the active list. + * + * This function is thread-safe but the timer and its timer list must not be + * freed while this function is running. + */ +void timer_del(QEMUTimer *ts); + +/** + * timer_mod_ns: + * @ts: the timer + * @expire_time: the expiry time in nanoseconds + * + * Modify a timer to expire at @expire_time + * + * This function is thread-safe but the timer and its timer list must not be + * freed while this function is running. + */ +void timer_mod_ns(QEMUTimer *ts, int64_t expire_time); + +/** + * timer_mod_anticipate_ns: + * @ts: the timer + * @expire_time: the expiry time in nanoseconds + * + * Modify a timer to expire at @expire_time or the current time, + * whichever comes earlier. + * + * This function is thread-safe but the timer and its timer list must not be + * freed while this function is running. + */ +void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t 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. + * + * This function is thread-safe but the timer and its timer list must not be + * freed while this function is running. + */ +void timer_mod(QEMUTimer *ts, int64_t expire_timer); + +/** + * timer_mod_anticipate: + * @ts: the timer + * @expire_time: the expiry time in nanoseconds + * + * Modify a timer to expire at @expire_time or the current time, whichever + * comes earlier, taking into account the scale associated with the timer. + * + * This function is thread-safe but the timer and its timer list must not be + * freed while this function is running. + */ +void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time); + +/** + * timer_pending: + * @ts: the timer + * + * Determines whether a timer is pending (i.e. is on the + * active list of timers, whether or not it has not yet expired). + * + * Returns: true if the timer is pending + */ +bool timer_pending(QEMUTimer *ts); + +/** + * timer_expired: + * @ts: the timer + * + * Determines whether a timer has expired. + * + * Returns: true if the timer has expired + */ +bool timer_expired(QEMUTimer *timer_head, int64_t current_time); + +/** + * timer_expire_time_ns: + * @ts: the timer + * + * Determine the expiry time of a timer + * + * Returns: the expiry time in nanoseconds + */ +uint64_t timer_expire_time_ns(QEMUTimer *ts); + +/** + * timer_get: + * @f: the file + * @ts: the timer + * + * Read a timer @ts from a file @f + */ +void timer_get(QEMUFile *f, QEMUTimer *ts); + +/** + * timer_put: + * @f: the file + * @ts: the timer + */ +void timer_put(QEMUFile *f, QEMUTimer *ts); + +/* + * General utility functions + */ + +/** + * 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); + +/** + * 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; +} + +/** + * initclocks: + * + * Initialise the clock & timer infrastructure + */ +void init_clocks(void); + +int64_t cpu_get_ticks(void); +/* Caller must hold BQL */ +void cpu_enable_ticks(void); +/* Caller must hold BQL */ +void cpu_disable_ticks(void); + +static inline int64_t get_ticks_per_sec(void) +{ + return 1000000000LL; +} + +static inline int64_t get_max_clock_jump(void) +{ + /* This should be small enough to prevent excessive interrupts from being + * generated by the RTC on clock jumps, but large enough to avoid frequent + * unnecessary resets in idle VMs. + */ + return 60 * get_ticks_per_sec(); +} + +/* + * Low level clock functions + */ + +/* 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 + +/* icount */ +int64_t cpu_get_icount_raw(void); +int64_t cpu_get_icount(void); +int64_t cpu_get_clock(void); +int64_t cpu_icount_to_ns(int64_t icount); + +/*******************************************/ +/* host CPU ticks (if available) */ + +#if defined(_ARCH_PPC) + +static inline int64_t cpu_get_host_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_host_ticks(void) +{ + int64_t val; + asm volatile ("rdtsc" : "=A" (val)); + return val; +} + +#elif defined(__x86_64__) + +static inline int64_t cpu_get_host_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_host_ticks(void) +{ + int val; + asm volatile ("mfctl %%cr16, %0" : "=r"(val)); + return val; +} + +#elif defined(__ia64) + +static inline int64_t cpu_get_host_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_host_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_host_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_host_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_host_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_host_ticks (void) +{ + static int64_t ticks = 0; + return ticks++; +} +#endif + +#ifdef CONFIG_PROFILER +static inline int64_t profile_getclock(void) +{ + return get_clock(); +} + +extern int64_t tcg_time; +extern int64_t dev_time; +#endif + +#endif |
