include/qemu/timer.h

   1 #ifndef QEMU_TIMER_H
   2 #define QEMU_TIMER_H
   3
   4 #include "qemu/typedefs.h"
   5 #include "qemu-common.h"
   6 #include "qemu/notify.h"
   7
   8 /* timers */
   9
  10 #define SCALE_MS 1000000
  11 #define SCALE_US 1000
  12 #define SCALE_NS 1
  13
  14 /**
  15  * QEMUClockType:
  16  *
  17  * The following clock types are available:
  18  *
  19  * @QEMU_CLOCK_REALTIME: Real time clock
  20  *
  21  * The real time clock should be used only for stuff which does not
  22  * change the virtual machine state, as it is run even if the virtual
  23  * machine is stopped. The real time clock has a frequency of 1000
  24  * Hz.
  25  *
  26  * @QEMU_CLOCK_VIRTUAL: virtual clock
  27  *
  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  *
  32  * @QEMU_CLOCK_HOST: host clock
  33  *
  34  * The host clock should be use for device models that emulate accurate
  35  * real time sources. It will continue to run when the virtual machine
  36  * is suspended, and it will reflect system time changes the host may
  37  * undergo (e.g. due to NTP). The host clock has the same precision as
  38  * the virtual clock.
  39  *
  40  * @QEMU_CLOCK_VIRTUAL_RT: realtime clock used for icount warp
  41  *
  42  * Outside icount mode, this clock is the same as @QEMU_CLOCK_VIRTUAL.
  43  * In icount mode, this clock counts nanoseconds while the virtual
  44  * machine is running.  It is used to increase @QEMU_CLOCK_VIRTUAL
  45  * while the CPUs are sleeping and thus not executing instructions.
  46  */
  47
  48 typedef enum {
  49     QEMU_CLOCK_REALTIME = 0,
  50     QEMU_CLOCK_VIRTUAL = 1,
  51     QEMU_CLOCK_HOST = 2,
  52     QEMU_CLOCK_VIRTUAL_RT = 3,
  53     QEMU_CLOCK_MAX
  54 } QEMUClockType;
  55
  56 typedef struct QEMUTimerList QEMUTimerList;
  57
  58 struct QEMUTimerListGroup {
  59     QEMUTimerList *tl[QEMU_CLOCK_MAX];
  60 };
  61
  62 typedef void QEMUTimerCB(void *opaque);
  63 typedef void QEMUTimerListNotifyCB(void *opaque);
  64
  65 struct QEMUTimer {
  66     int64_t expire_time;        /* in nanoseconds */
  67     QEMUTimerList *timer_list;
  68     QEMUTimerCB *cb;
  69     void *opaque;
  70     QEMUTimer *next;
  71     int scale;
  72 };
  73
  74 extern QEMUTimerListGroup main_loop_tlg;
  75
  76 /*
  77  * QEMUClockType
  78  */
  79
  80 /*
  81  * qemu_clock_get_ns;
  82  * @type: the clock type
  83  *
  84  * Get the nanosecond value of a clock with
  85  * type @type
  86  *
  87  * Returns: the clock value in nanoseconds
  88  */
  89 int64_t qemu_clock_get_ns(QEMUClockType type);
  90
  91 /**
  92  * qemu_clock_get_ms;
  93  * @type: the clock type
  94  *
  95  * Get the millisecond value of a clock with
  96  * type @type
  97  *
  98  * Returns: the clock value in milliseconds
  99  */
 100 static inline int64_t qemu_clock_get_ms(QEMUClockType type)
 101 {
 102     return qemu_clock_get_ns(type) / SCALE_MS;
 103 }
 104
 105 /**
 106  * qemu_clock_get_us;
 107  * @type: the clock type
 108  *
 109  * Get the microsecond value of a clock with
 110  * type @type
 111  *
 112  * Returns: the clock value in microseconds
 113  */
 114 static inline int64_t qemu_clock_get_us(QEMUClockType type)
 115 {
 116     return qemu_clock_get_ns(type) / SCALE_US;
 117 }
 118
 119 /**
 120  * qemu_clock_has_timers:
 121  * @type: the clock type
 122  *
 123  * Determines whether a clock's default timer list
 124  * has timers attached
 125  *
 126  * Note that this function should not be used when other threads also access
 127  * the timer list.  The return value may be outdated by the time it is acted
 128  * upon.
 129  *
 130  * Returns: true if the clock's default timer list
 131  * has timers attached
 132  */
 133 bool qemu_clock_has_timers(QEMUClockType type);
 134
 135 /**
 136  * qemu_clock_expired:
 137  * @type: the clock type
 138  *
 139  * Determines whether a clock's default timer list
 140  * has an expired clock.
 141  *
 142  * Returns: true if the clock's default timer list has
 143  * an expired timer
 144  */
 145 bool qemu_clock_expired(QEMUClockType type);
 146
 147 /**
 148  * qemu_clock_use_for_deadline:
 149  * @type: the clock type
 150  *
 151  * Determine whether a clock should be used for deadline
 152  * calculations. Some clocks, for instance vm_clock with
 153  * use_icount set, do not count in nanoseconds. Such clocks
 154  * are not used for deadline calculations, and are presumed
 155  * to interrupt any poll using qemu_notify/aio_notify
 156  * etc.
 157  *
 158  * Returns: true if the clock runs in nanoseconds and
 159  * should be used for a deadline.
 160  */
 161 bool qemu_clock_use_for_deadline(QEMUClockType type);
 162
 163 /**
 164  * qemu_clock_deadline_ns_all:
 165  * @type: the clock type
 166  *
 167  * Calculate the deadline across all timer lists associated
 168  * with a clock (as opposed to just the default one)
 169  * in nanoseconds, or -1 if no timer is set to expire.
 170  *
 171  * Returns: time until expiry in nanoseconds or -1
 172  */
 173 int64_t qemu_clock_deadline_ns_all(QEMUClockType type);
 174
 175 /**
 176  * qemu_clock_get_main_loop_timerlist:
 177  * @type: the clock type
 178  *
 179  * Return the default timer list assocatiated with a clock.
 180  *
 181  * Returns: the default timer list
 182  */
 183 QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type);
 184
 185 /**
 186  * qemu_clock_nofify:
 187  * @type: the clock type
 188  *
 189  * Call the notifier callback connected with the default timer
 190  * list linked to the clock, or qemu_notify() if none.
 191  */
 192 void qemu_clock_notify(QEMUClockType type);
 193
 194 /**
 195  * qemu_clock_enable:
 196  * @type: the clock type
 197  * @enabled: true to enable, false to disable
 198  *
 199  * Enable or disable a clock
 200  * Disabling the clock will wait for related timerlists to stop
 201  * executing qemu_run_timers.  Thus, this functions should not
 202  * be used from the callback of a timer that is based on @clock.
 203  * Doing so would cause a deadlock.
 204  *
 205  * Caller should hold BQL.
 206  */
 207 void qemu_clock_enable(QEMUClockType type, bool enabled);
 208
 209 /**
 210  * qemu_clock_warp:
 211  * @type: the clock type
 212  *
 213  * Warp a clock to a new value
 214  */
 215 void qemu_clock_warp(QEMUClockType type);
 216
 217 /**
 218  * qemu_clock_register_reset_notifier:
 219  * @type: the clock type
 220  * @notifier: the notifier function
 221  *
 222  * Register a notifier function to call when the clock
 223  * concerned is reset.
 224  */
 225 void qemu_clock_register_reset_notifier(QEMUClockType type,
 226                                         Notifier *notifier);
 227
 228 /**
 229  * qemu_clock_unregister_reset_notifier:
 230  * @type: the clock type
 231  * @notifier: the notifier function
 232  *
 233  * Unregister a notifier function to call when the clock
 234  * concerned is reset.
 235  */
 236 void qemu_clock_unregister_reset_notifier(QEMUClockType type,
 237                                           Notifier *notifier);
 238
 239 /**
 240  * qemu_clock_run_timers:
 241  * @type: clock on which to operate
 242  *
 243  * Run all the timers associated with the default timer list
 244  * of a clock.
 245  *
 246  * Returns: true if any timer ran.
 247  */
 248 bool qemu_clock_run_timers(QEMUClockType type);
 249
 250 /**
 251  * qemu_clock_run_all_timers:
 252  *
 253  * Run all the timers associated with the default timer list
 254  * of every clock.
 255  *
 256  * Returns: true if any timer ran.
 257  */
 258 bool qemu_clock_run_all_timers(void);
 259
 260 /*
 261  * QEMUTimerList
 262  */
 263
 264 /**
 265  * timerlist_new:
 266  * @type: the clock type to associate with the timerlist
 267  * @cb: the callback to call on notification
 268  * @opaque: the opaque pointer to pass to the callback
 269  *
 270  * Create a new timerlist associated with the clock of
 271  * type @type.
 272  *
 273  * Returns: a pointer to the QEMUTimerList created
 274  */
 275 QEMUTimerList *timerlist_new(QEMUClockType type,
 276                              QEMUTimerListNotifyCB *cb, void *opaque);
 277
 278 /**
 279  * timerlist_free:
 280  * @timer_list: the timer list to free
 281  *
 282  * Frees a timer_list. It must have no active timers.
 283  */
 284 void timerlist_free(QEMUTimerList *timer_list);
 285
 286 /**
 287  * timerlist_has_timers:
 288  * @timer_list: the timer list to operate on
 289  *
 290  * Determine whether a timer list has active timers
 291  *
 292  * Note that this function should not be used when other threads also access
 293  * the timer list.  The return value may be outdated by the time it is acted
 294  * upon.
 295  *
 296  * Returns: true if the timer list has timers.
 297  */
 298 bool timerlist_has_timers(QEMUTimerList *timer_list);
 299
 300 /**
 301  * timerlist_expired:
 302  * @timer_list: the timer list to operate on
 303  *
 304  * Determine whether a timer list has any timers which
 305  * are expired.
 306  *
 307  * Returns: true if the timer list has timers which
 308  * have expired.
 309  */
 310 bool timerlist_expired(QEMUTimerList *timer_list);
 311
 312 /**
 313  * timerlist_deadline_ns:
 314  * @timer_list: the timer list to operate on
 315  *
 316  * Determine the deadline for a timer_list, i.e.
 317  * the number of nanoseconds until the first timer
 318  * expires. Return -1 if there are no timers.
 319  *
 320  * Returns: the number of nanoseconds until the earliest
 321  * timer expires -1 if none
 322  */
 323 int64_t timerlist_deadline_ns(QEMUTimerList *timer_list);
 324
 325 /**
 326  * timerlist_get_clock:
 327  * @timer_list: the timer list to operate on
 328  *
 329  * Determine the clock type associated with a timer list.
 330  *
 331  * Returns: the clock type associated with the
 332  * timer list.
 333  */
 334 QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list);
 335
 336 /**
 337  * timerlist_run_timers:
 338  * @timer_list: the timer list to use
 339  *
 340  * Call all expired timers associated with the timer list.
 341  *
 342  * Returns: true if any timer expired
 343  */
 344 bool timerlist_run_timers(QEMUTimerList *timer_list);
 345
 346 /**
 347  * timerlist_notify:
 348  * @timer_list: the timer list to use
 349  *
 350  * call the notifier callback associated with the timer list.
 351  */
 352 void timerlist_notify(QEMUTimerList *timer_list);
 353
 354 /*
 355  * QEMUTimerListGroup
 356  */
 357
 358 /**
 359  * timerlistgroup_init:
 360  * @tlg: the timer list group
 361  * @cb: the callback to call when a notify is required
 362  * @opaque: the opaque pointer to be passed to the callback.
 363  *
 364  * Initialise a timer list group. This must already be
 365  * allocated in memory and zeroed. The notifier callback is
 366  * called whenever a clock in the timer list group is
 367  * reenabled or whenever a timer associated with any timer
 368  * list is modified. If @cb is specified as null, qemu_notify()
 369  * is used instead.
 370  */
 371 void timerlistgroup_init(QEMUTimerListGroup *tlg,
 372                          QEMUTimerListNotifyCB *cb, void *opaque);
 373
 374 /**
 375  * timerlistgroup_deinit:
 376  * @tlg: the timer list group
 377  *
 378  * Deinitialise a timer list group. This must already be
 379  * initialised. Note the memory is not freed.
 380  */
 381 void timerlistgroup_deinit(QEMUTimerListGroup *tlg);
 382
 383 /**
 384  * timerlistgroup_run_timers:
 385  * @tlg: the timer list group
 386  *
 387  * Run the timers associated with a timer list group.
 388  * This will run timers on multiple clocks.
 389  *
 390  * Returns: true if any timer callback ran
 391  */
 392 bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg);
 393
 394 /**
 395  * timerlistgroup_deadline_ns:
 396  * @tlg: the timer list group
 397  *
 398  * Determine the deadline of the soonest timer to
 399  * expire associated with any timer list linked to
 400  * the timer list group. Only clocks suitable for
 401  * deadline calculation are included.
 402  *
 403  * Returns: the deadline in nanoseconds or -1 if no
 404  * timers are to expire.
 405  */
 406 int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg);
 407
 408 /*
 409  * QEMUTimer
 410  */
 411
 412 /**
 413  * timer_init:
 414  * @ts: the timer to be initialised
 415  * @timer_list: the timer list to attach the timer to
 416  * @scale: the scale value for the timer
 417  * @cb: the callback to be called when the timer expires
 418  * @opaque: the opaque pointer to be passed to the callback
 419  *
 420  * Initialise a new timer and associate it with @timer_list.
 421  * The caller is responsible for allocating the memory.
 422  *
 423  * You need not call an explicit deinit call. Simply make
 424  * sure it is not on a list with timer_del.
 425  */
 426 void timer_init(QEMUTimer *ts,
 427                 QEMUTimerList *timer_list, int scale,
 428                 QEMUTimerCB *cb, void *opaque);
 429
 430 /**
 431  * timer_new_tl:
 432  * @timer_list: the timer list to attach the timer to
 433  * @scale: the scale value for the timer
 434  * @cb: the callback to be called when the timer expires
 435  * @opaque: the opaque pointer to be passed to the callback
 436  *
 437  * Creeate a new timer and associate it with @timer_list.
 438  * The memory is allocated by the function.
 439  *
 440  * This is not the preferred interface unless you know you
 441  * are going to call timer_free. Use timer_init instead.
 442  *
 443  * Returns: a pointer to the timer
 444  */
 445 static inline QEMUTimer *timer_new_tl(QEMUTimerList *timer_list,
 446                                       int scale,
 447                                       QEMUTimerCB *cb,
 448                                       void *opaque)
 449 {
 450     QEMUTimer *ts = g_malloc0(sizeof(QEMUTimer));
 451     timer_init(ts, timer_list, scale, cb, opaque);
 452     return ts;
 453 }
 454
 455 /**
 456  * timer_new:
 457  * @type: the clock type to use
 458  * @scale: the scale value for the timer
 459  * @cb: the callback to be called when the timer expires
 460  * @opaque: the opaque pointer to be passed to the callback
 461  *
 462  * Creeate a new timer and associate it with the default
 463  * timer list for the clock type @type.
 464  *
 465  * Returns: a pointer to the timer
 466  */
 467 static inline QEMUTimer *timer_new(QEMUClockType type, int scale,
 468                                    QEMUTimerCB *cb, void *opaque)
 469 {
 470     return timer_new_tl(main_loop_tlg.tl[type], scale, cb, opaque);
 471 }
 472
 473 /**
 474  * timer_new_ns:
 475  * @clock: the clock to associate with the timer
 476  * @callback: the callback to call when the timer expires
 477  * @opaque: the opaque pointer to pass to the callback
 478  *
 479  * Create a new timer with nanosecond scale on the default timer list
 480  * associated with the clock.
 481  *
 482  * Returns: a pointer to the newly created timer
 483  */
 484 static inline QEMUTimer *timer_new_ns(QEMUClockType type, QEMUTimerCB *cb,
 485                                       void *opaque)
 486 {
 487     return timer_new(type, SCALE_NS, cb, opaque);
 488 }
 489
 490 /**
 491  * timer_new_us:
 492  * @clock: the clock to associate with the timer
 493  * @callback: the callback to call when the timer expires
 494  * @opaque: the opaque pointer to pass to the callback
 495  *
 496  * Create a new timer with microsecond scale on the default timer list
 497  * associated with the clock.
 498  *
 499  * Returns: a pointer to the newly created timer
 500  */
 501 static inline QEMUTimer *timer_new_us(QEMUClockType type, QEMUTimerCB *cb,
 502                                       void *opaque)
 503 {
 504     return timer_new(type, SCALE_US, cb, opaque);
 505 }
 506
 507 /**
 508  * timer_new_ms:
 509  * @clock: the clock to associate with the timer
 510  * @callback: the callback to call when the timer expires
 511  * @opaque: the opaque pointer to pass to the callback
 512  *
 513  * Create a new timer with millisecond scale on the default timer list
 514  * associated with the clock.
 515  *
 516  * Returns: a pointer to the newly created timer
 517  */
 518 static inline QEMUTimer *timer_new_ms(QEMUClockType type, QEMUTimerCB *cb,
 519                                       void *opaque)
 520 {
 521     return timer_new(type, SCALE_MS, cb, opaque);
 522 }
 523
 524 /**
 525  * timer_free:
 526  * @ts: the timer
 527  *
 528  * Free a timer (it must not be on the active list)
 529  */
 530 void timer_free(QEMUTimer *ts);
 531
 532 /**
 533  * timer_del:
 534  * @ts: the timer
 535  *
 536  * Delete a timer from the active list.
 537  *
 538  * This function is thread-safe but the timer and its timer list must not be
 539  * freed while this function is running.
 540  */
 541 void timer_del(QEMUTimer *ts);
 542
 543 /**
 544  * timer_mod_ns:
 545  * @ts: the timer
 546  * @expire_time: the expiry time in nanoseconds
 547  *
 548  * Modify a timer to expire at @expire_time
 549  *
 550  * This function is thread-safe but the timer and its timer list must not be
 551  * freed while this function is running.
 552  */
 553 void timer_mod_ns(QEMUTimer *ts, int64_t expire_time);
 554
 555 /**
 556  * timer_mod_anticipate_ns:
 557  * @ts: the timer
 558  * @expire_time: the expiry time in nanoseconds
 559  *
 560  * Modify a timer to expire at @expire_time or the current time,
 561  * whichever comes earlier.
 562  *
 563  * This function is thread-safe but the timer and its timer list must not be
 564  * freed while this function is running.
 565  */
 566 void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time);
 567
 568 /**
 569  * timer_mod:
 570  * @ts: the timer
 571  * @expire_time: the expire time in the units associated with the timer
 572  *
 573  * Modify a timer to expiry at @expire_time, taking into
 574  * account the scale associated with the timer.
 575  *
 576  * This function is thread-safe but the timer and its timer list must not be
 577  * freed while this function is running.
 578  */
 579 void timer_mod(QEMUTimer *ts, int64_t expire_timer);
 580
 581 /**
 582  * timer_mod_anticipate:
 583  * @ts: the timer
 584  * @expire_time: the expiry time in nanoseconds
 585  *
 586  * Modify a timer to expire at @expire_time or the current time, whichever
 587  * comes earlier, taking into account the scale associated with the timer.
 588  *
 589  * This function is thread-safe but the timer and its timer list must not be
 590  * freed while this function is running.
 591  */
 592 void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time);
 593
 594 /**
 595  * timer_pending:
 596  * @ts: the timer
 597  *
 598  * Determines whether a timer is pending (i.e. is on the
 599  * active list of timers, whether or not it has not yet expired).
 600  *
 601  * Returns: true if the timer is pending
 602  */
 603 bool timer_pending(QEMUTimer *ts);
 604
 605 /**
 606  * timer_expired:
 607  * @ts: the timer
 608  *
 609  * Determines whether a timer has expired.
 610  *
 611  * Returns: true if the timer has expired
 612  */
 613 bool timer_expired(QEMUTimer *timer_head, int64_t current_time);
 614
 615 /**
 616  * timer_expire_time_ns:
 617  * @ts: the timer
 618  *
 619  * Determine the expiry time of a timer
 620  *
 621  * Returns: the expiry time in nanoseconds
 622  */
 623 uint64_t timer_expire_time_ns(QEMUTimer *ts);
 624
 625 /**
 626  * timer_get:
 627  * @f: the file
 628  * @ts: the timer
 629  *
 630  * Read a timer @ts from a file @f
 631  */
 632 void timer_get(QEMUFile *f, QEMUTimer *ts);
 633
 634 /**
 635  * timer_put:
 636  * @f: the file
 637  * @ts: the timer
 638  */
 639 void timer_put(QEMUFile *f, QEMUTimer *ts);
 640
 641 /*
 642  * General utility functions
 643  */
 644
 645 /**
 646  * qemu_timeout_ns_to_ms:
 647  * @ns: nanosecond timeout value
 648  *
 649  * Convert a nanosecond timeout value (or -1) to
 650  * a millisecond value (or -1), always rounding up.
 651  *
 652  * Returns: millisecond timeout value
 653  */
 654 int qemu_timeout_ns_to_ms(int64_t ns);
 655
 656 /**
 657  * qemu_poll_ns:
 658  * @fds: Array of file descriptors
 659  * @nfds: number of file descriptors
 660  * @timeout: timeout in nanoseconds
 661  *
 662  * Perform a poll like g_poll but with a timeout in nanoseconds.
 663  * See g_poll documentation for further details.
 664  *
 665  * Returns: number of fds ready
 666  */
 667 int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout);
 668
 669 /**
 670  * qemu_soonest_timeout:
 671  * @timeout1: first timeout in nanoseconds (or -1 for infinite)
 672  * @timeout2: second timeout in nanoseconds (or -1 for infinite)
 673  *
 674  * Calculates the soonest of two timeout values. -1 means infinite, which
 675  * is later than any other value.
 676  *
 677  * Returns: soonest timeout value in nanoseconds (or -1 for infinite)
 678  */
 679 static inline int64_t qemu_soonest_timeout(int64_t timeout1, int64_t timeout2)
 680 {
 681     /* we can abuse the fact that -1 (which means infinite) is a maximal
 682      * value when cast to unsigned. As this is disgusting, it's kept in
 683      * one inline function.
 684      */
 685     return ((uint64_t) timeout1 < (uint64_t) timeout2) ? timeout1 : timeout2;
 686 }
 687
 688 /**
 689  * initclocks:
 690  *
 691  * Initialise the clock & timer infrastructure
 692  */
 693 void init_clocks(void);
 694
 695 int64_t cpu_get_ticks(void);
 696 /* Caller must hold BQL */
 697 void cpu_enable_ticks(void);
 698 /* Caller must hold BQL */
 699 void cpu_disable_ticks(void);
 700
 701 static inline int64_t get_ticks_per_sec(void)
 702 {
 703     return 1000000000LL;
 704 }
 705
 706 /*
 707  * Low level clock functions
 708  */
 709
 710 /* real time host monotonic timer */
 711 static inline int64_t get_clock_realtime(void)
 712 {
 713     struct timeval tv;
 714
 715     gettimeofday(&tv, NULL);
 716     return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
 717 }
 718
 719 /* Warning: don't insert tracepoints into these functions, they are
 720    also used by simpletrace backend and tracepoints would cause
 721    an infinite recursion! */
 722 #ifdef _WIN32
 723 extern int64_t clock_freq;
 724
 725 static inline int64_t get_clock(void)
 726 {
 727     LARGE_INTEGER ti;
 728     QueryPerformanceCounter(&ti);
 729     return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
 730 }
 731
 732 #else
 733
 734 extern int use_rt_clock;
 735
 736 static inline int64_t get_clock(void)
 737 {
 738 #ifdef CLOCK_MONOTONIC
 739     if (use_rt_clock) {
 740         struct timespec ts;
 741         clock_gettime(CLOCK_MONOTONIC, &ts);
 742         return ts.tv_sec * 1000000000LL + ts.tv_nsec;
 743     } else
 744 #endif
 745     {
 746         /* XXX: using gettimeofday leads to problems if the date
 747            changes, so it should be avoided. */
 748         return get_clock_realtime();
 749     }
 750 }
 751 #endif
 752
 753 /* icount */
 754 int64_t cpu_get_icount_raw(void);
 755 int64_t cpu_get_icount(void);
 756 int64_t cpu_get_clock(void);
 757 int64_t cpu_get_clock_offset(void);
 758 int64_t cpu_icount_to_ns(int64_t icount);
 759
 760 /*******************************************/
 761 /* host CPU ticks (if available) */
 762
 763 #if defined(_ARCH_PPC)
 764
 765 static inline int64_t cpu_get_real_ticks(void)
 766 {
 767     int64_t retval;
 768 #ifdef _ARCH_PPC64
 769     /* This reads timebase in one 64bit go and includes Cell workaround from:
 770        http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
 771     */
 772     __asm__ __volatile__ ("mftb    %0\n\t"
 773                           "cmpwi   %0,0\n\t"
 774                           "beq-    $-8"
 775                           : "=r" (retval));
 776 #else
 777     /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
 778     unsigned long junk;
 779     __asm__ __volatile__ ("mfspr   %1,269\n\t"  /* mftbu */
 780                           "mfspr   %L0,268\n\t" /* mftb */
 781                           "mfspr   %0,269\n\t"  /* mftbu */
 782                           "cmpw    %0,%1\n\t"
 783                           "bne     $-16"
 784                           : "=r" (retval), "=r" (junk));
 785 #endif
 786     return retval;
 787 }
 788
 789 #elif defined(__i386__)
 790
 791 static inline int64_t cpu_get_real_ticks(void)
 792 {
 793     int64_t val;
 794     asm volatile ("rdtsc" : "=A" (val));
 795     return val;
 796 }
 797
 798 #elif defined(__x86_64__)
 799
 800 static inline int64_t cpu_get_real_ticks(void)
 801 {
 802     uint32_t low,high;
 803     int64_t val;
 804     asm volatile("rdtsc" : "=a" (low), "=d" (high));
 805     val = high;
 806     val <<= 32;
 807     val |= low;
 808     return val;
 809 }
 810
 811 #elif defined(__hppa__)
 812
 813 static inline int64_t cpu_get_real_ticks(void)
 814 {
 815     int val;
 816     asm volatile ("mfctl %%cr16, %0" : "=r"(val));
 817     return val;
 818 }
 819
 820 #elif defined(__ia64)
 821
 822 static inline int64_t cpu_get_real_ticks(void)
 823 {
 824     int64_t val;
 825     asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory");
 826     return val;
 827 }
 828
 829 #elif defined(__s390__)
 830
 831 static inline int64_t cpu_get_real_ticks(void)
 832 {
 833     int64_t val;
 834     asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc");
 835     return val;
 836 }
 837
 838 #elif defined(__sparc__)
 839
 840 static inline int64_t cpu_get_real_ticks (void)
 841 {
 842 #if defined(_LP64)
 843     uint64_t        rval;
 844     asm volatile("rd %%tick,%0" : "=r"(rval));
 845     return rval;
 846 #else
 847     /* We need an %o or %g register for this.  For recent enough gcc
 848        there is an "h" constraint for that.  Don't bother with that.  */
 849     union {
 850         uint64_t i64;
 851         struct {
 852             uint32_t high;
 853             uint32_t low;
 854         }       i32;
 855     } rval;
 856     asm volatile("rd %%tick,%%g1; srlx %%g1,32,%0; mov %%g1,%1"
 857                  : "=r"(rval.i32.high), "=r"(rval.i32.low) : : "g1");
 858     return rval.i64;
 859 #endif
 860 }
 861
 862 #elif defined(__mips__) && \
 863     ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
 864 /*
 865  * binutils wants to use rdhwr only on mips32r2
 866  * but as linux kernel emulate it, it's fine
 867  * to use it.
 868  *
 869  */
 870 #define MIPS_RDHWR(rd, value) {                         \
 871         __asm__ __volatile__ (".set   push\n\t"         \
 872                               ".set mips32r2\n\t"       \
 873                               "rdhwr  %0, "rd"\n\t"     \
 874                               ".set   pop"              \
 875                               : "=r" (value));          \
 876     }
 877
 878 static inline int64_t cpu_get_real_ticks(void)
 879 {
 880     /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
 881     uint32_t count;
 882     static uint32_t cyc_per_count = 0;
 883
 884     if (!cyc_per_count) {
 885         MIPS_RDHWR("$3", cyc_per_count);
 886     }
 887
 888     MIPS_RDHWR("$2", count);
 889     return (int64_t)(count * cyc_per_count);
 890 }
 891
 892 #elif defined(__alpha__)
 893
 894 static inline int64_t cpu_get_real_ticks(void)
 895 {
 896     uint64_t cc;
 897     uint32_t cur, ofs;
 898
 899     asm volatile("rpcc %0" : "=r"(cc));
 900     cur = cc;
 901     ofs = cc >> 32;
 902     return cur - ofs;
 903 }
 904
 905 #else
 906 /* The host CPU doesn't have an easily accessible cycle counter.
 907    Just return a monotonically increasing value.  This will be
 908    totally wrong, but hopefully better than nothing.  */
 909 static inline int64_t cpu_get_real_ticks (void)
 910 {
 911     static int64_t ticks = 0;
 912     return ticks++;
 913 }
 914 #endif
 915
 916 #ifdef CONFIG_PROFILER
 917 static inline int64_t profile_getclock(void)
 918 {
 919     return cpu_get_real_ticks();
 920 }
 921
 922 extern int64_t qemu_time, qemu_time_start;
 923 extern int64_t tlb_flush_time;
 924 extern int64_t dev_time;
 925 #endif
 926
 927 #endif