Annotation of qemu/qemu-timer.h, revision 1.1.1.6

1.1       root        1: #ifndef QEMU_TIMER_H
                      2: #define QEMU_TIMER_H
                      3: 
1.1.1.3   root        4: #include "qemu-common.h"
1.1.1.6 ! root        5: #include "main-loop.h"
1.1.1.5   root        6: #include "notify.h"
1.1.1.4   root        7: #include <time.h>
                      8: #include <sys/time.h>
                      9: 
                     10: #ifdef _WIN32
                     11: #include <windows.h>
                     12: #endif
1.1.1.3   root       13: 
1.1       root       14: /* timers */
                     15: 
1.1.1.5   root       16: #define SCALE_MS 1000000
                     17: #define SCALE_US 1000
                     18: #define SCALE_NS 1
                     19: 
1.1       root       20: typedef struct QEMUClock QEMUClock;
                     21: typedef void QEMUTimerCB(void *opaque);
                     22: 
                     23: /* The real time clock should be used only for stuff which does not
                     24:    change the virtual machine state, as it is run even if the virtual
                     25:    machine is stopped. The real time clock has a frequency of 1000
                     26:    Hz. */
                     27: extern QEMUClock *rt_clock;
                     28: 
                     29: /* The virtual clock is only run during the emulation. It is stopped
                     30:    when the virtual machine is stopped. Virtual timers use a high
                     31:    precision clock, usually cpu cycles (use ticks_per_sec). */
                     32: extern QEMUClock *vm_clock;
                     33: 
1.1.1.2   root       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: extern QEMUClock *host_clock;
                     40: 
1.1.1.3   root       41: int64_t qemu_get_clock_ns(QEMUClock *clock);
1.1.1.6 ! root       42: int64_t qemu_clock_has_timers(QEMUClock *clock);
        !            43: int64_t qemu_clock_expired(QEMUClock *clock);
        !            44: int64_t qemu_clock_deadline(QEMUClock *clock);
1.1.1.3   root       45: void qemu_clock_enable(QEMUClock *clock, int enabled);
1.1.1.5   root       46: void qemu_clock_warp(QEMUClock *clock);
                     47: 
                     48: void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier);
                     49: void qemu_unregister_clock_reset_notifier(QEMUClock *clock,
                     50:                                           Notifier *notifier);
1.1       root       51: 
1.1.1.5   root       52: QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
                     53:                           QEMUTimerCB *cb, void *opaque);
1.1       root       54: void qemu_free_timer(QEMUTimer *ts);
                     55: void qemu_del_timer(QEMUTimer *ts);
1.1.1.6 ! root       56: void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time);
1.1       root       57: void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
                     58: int qemu_timer_pending(QEMUTimer *ts);
1.1.1.2   root       59: int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
1.1.1.6 ! root       60: uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts);
1.1       root       61: 
1.1.1.3   root       62: void qemu_run_all_timers(void);
                     63: int qemu_alarm_pending(void);
                     64: void configure_alarms(char const *opt);
                     65: int qemu_calculate_timeout(void);
                     66: void init_clocks(void);
                     67: int init_timer_alarm(void);
                     68: 
1.1.1.5   root       69: int64_t cpu_get_ticks(void);
                     70: void cpu_enable_ticks(void);
                     71: void cpu_disable_ticks(void);
                     72: 
                     73: static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb,
                     74:                                            void *opaque)
                     75: {
                     76:     return qemu_new_timer(clock, SCALE_NS, cb, opaque);
                     77: }
                     78: 
                     79: static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock, QEMUTimerCB *cb,
                     80:                                            void *opaque)
                     81: {
                     82:     return qemu_new_timer(clock, SCALE_MS, cb, opaque);
                     83: }
                     84: 
                     85: static inline int64_t qemu_get_clock_ms(QEMUClock *clock)
                     86: {
                     87:     return qemu_get_clock_ns(clock) / SCALE_MS;
                     88: }
                     89: 
1.1.1.2   root       90: static inline int64_t get_ticks_per_sec(void)
                     91: {
                     92:     return 1000000000LL;
                     93: }
1.1       root       94: 
1.1.1.4   root       95: /* real time host monotonic timer */
                     96: static inline int64_t get_clock_realtime(void)
                     97: {
                     98:     struct timeval tv;
                     99: 
                    100:     gettimeofday(&tv, NULL);
                    101:     return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
                    102: }
                    103: 
                    104: /* Warning: don't insert tracepoints into these functions, they are
                    105:    also used by simpletrace backend and tracepoints would cause
                    106:    an infinite recursion! */
                    107: #ifdef _WIN32
                    108: extern int64_t clock_freq;
                    109: 
                    110: static inline int64_t get_clock(void)
                    111: {
                    112:     LARGE_INTEGER ti;
                    113:     QueryPerformanceCounter(&ti);
                    114:     return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
                    115: }
                    116: 
                    117: #else
                    118: 
                    119: extern int use_rt_clock;
                    120: 
                    121: static inline int64_t get_clock(void)
                    122: {
                    123: #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
                    124:     || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
                    125:     if (use_rt_clock) {
                    126:         struct timespec ts;
                    127:         clock_gettime(CLOCK_MONOTONIC, &ts);
                    128:         return ts.tv_sec * 1000000000LL + ts.tv_nsec;
                    129:     } else
                    130: #endif
                    131:     {
                    132:         /* XXX: using gettimeofday leads to problems if the date
                    133:            changes, so it should be avoided. */
                    134:         return get_clock_realtime();
                    135:     }
                    136: }
                    137: #endif
1.1.1.3   root      138: 
1.1       root      139: void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
                    140: void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
                    141: 
                    142: /* ptimer.c */
                    143: typedef struct ptimer_state ptimer_state;
                    144: typedef void (*ptimer_cb)(void *opaque);
                    145: 
                    146: ptimer_state *ptimer_init(QEMUBH *bh);
                    147: void ptimer_set_period(ptimer_state *s, int64_t period);
                    148: void ptimer_set_freq(ptimer_state *s, uint32_t freq);
                    149: void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload);
                    150: uint64_t ptimer_get_count(ptimer_state *s);
                    151: void ptimer_set_count(ptimer_state *s, uint64_t count);
                    152: void ptimer_run(ptimer_state *s, int oneshot);
                    153: void ptimer_stop(ptimer_state *s);
                    154: 
1.1.1.3   root      155: /* icount */
                    156: int64_t cpu_get_icount(void);
1.1.1.6 ! root      157: int64_t cpu_get_clock(void);
1.1.1.3   root      158: 
                    159: /*******************************************/
                    160: /* host CPU ticks (if available) */
                    161: 
                    162: #if defined(_ARCH_PPC)
                    163: 
                    164: static inline int64_t cpu_get_real_ticks(void)
                    165: {
                    166:     int64_t retval;
                    167: #ifdef _ARCH_PPC64
                    168:     /* This reads timebase in one 64bit go and includes Cell workaround from:
                    169:        http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
                    170:     */
                    171:     __asm__ __volatile__ ("mftb    %0\n\t"
                    172:                           "cmpwi   %0,0\n\t"
                    173:                           "beq-    $-8"
                    174:                           : "=r" (retval));
                    175: #else
                    176:     /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
                    177:     unsigned long junk;
                    178:     __asm__ __volatile__ ("mfspr   %1,269\n\t"  /* mftbu */
                    179:                           "mfspr   %L0,268\n\t" /* mftb */
                    180:                           "mfspr   %0,269\n\t"  /* mftbu */
                    181:                           "cmpw    %0,%1\n\t"
                    182:                           "bne     $-16"
                    183:                           : "=r" (retval), "=r" (junk));
                    184: #endif
                    185:     return retval;
                    186: }
                    187: 
                    188: #elif defined(__i386__)
                    189: 
                    190: static inline int64_t cpu_get_real_ticks(void)
                    191: {
                    192:     int64_t val;
                    193:     asm volatile ("rdtsc" : "=A" (val));
                    194:     return val;
                    195: }
                    196: 
                    197: #elif defined(__x86_64__)
                    198: 
                    199: static inline int64_t cpu_get_real_ticks(void)
                    200: {
                    201:     uint32_t low,high;
                    202:     int64_t val;
                    203:     asm volatile("rdtsc" : "=a" (low), "=d" (high));
                    204:     val = high;
                    205:     val <<= 32;
                    206:     val |= low;
                    207:     return val;
                    208: }
                    209: 
                    210: #elif defined(__hppa__)
                    211: 
                    212: static inline int64_t cpu_get_real_ticks(void)
                    213: {
                    214:     int val;
                    215:     asm volatile ("mfctl %%cr16, %0" : "=r"(val));
                    216:     return val;
                    217: }
                    218: 
                    219: #elif defined(__ia64)
                    220: 
                    221: static inline int64_t cpu_get_real_ticks(void)
                    222: {
                    223:     int64_t val;
                    224:     asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory");
                    225:     return val;
                    226: }
                    227: 
                    228: #elif defined(__s390__)
                    229: 
                    230: static inline int64_t cpu_get_real_ticks(void)
                    231: {
                    232:     int64_t val;
                    233:     asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc");
                    234:     return val;
                    235: }
                    236: 
                    237: #elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
                    238: 
                    239: static inline int64_t cpu_get_real_ticks (void)
                    240: {
                    241: #if defined(_LP64)
                    242:     uint64_t        rval;
                    243:     asm volatile("rd %%tick,%0" : "=r"(rval));
                    244:     return rval;
                    245: #else
                    246:     union {
                    247:         uint64_t i64;
                    248:         struct {
                    249:             uint32_t high;
                    250:             uint32_t low;
                    251:         }       i32;
                    252:     } rval;
                    253:     asm volatile("rd %%tick,%1; srlx %1,32,%0"
                    254:                  : "=r"(rval.i32.high), "=r"(rval.i32.low));
                    255:     return rval.i64;
                    256: #endif
                    257: }
                    258: 
                    259: #elif defined(__mips__) && \
                    260:     ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
                    261: /*
                    262:  * binutils wants to use rdhwr only on mips32r2
                    263:  * but as linux kernel emulate it, it's fine
                    264:  * to use it.
                    265:  *
                    266:  */
                    267: #define MIPS_RDHWR(rd, value) {                         \
                    268:         __asm__ __volatile__ (".set   push\n\t"         \
                    269:                               ".set mips32r2\n\t"       \
                    270:                               "rdhwr  %0, "rd"\n\t"     \
                    271:                               ".set   pop"              \
                    272:                               : "=r" (value));          \
                    273:     }
                    274: 
                    275: static inline int64_t cpu_get_real_ticks(void)
                    276: {
                    277:     /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
                    278:     uint32_t count;
                    279:     static uint32_t cyc_per_count = 0;
                    280: 
                    281:     if (!cyc_per_count) {
                    282:         MIPS_RDHWR("$3", cyc_per_count);
                    283:     }
                    284: 
                    285:     MIPS_RDHWR("$2", count);
                    286:     return (int64_t)(count * cyc_per_count);
                    287: }
                    288: 
                    289: #elif defined(__alpha__)
                    290: 
                    291: static inline int64_t cpu_get_real_ticks(void)
                    292: {
                    293:     uint64_t cc;
                    294:     uint32_t cur, ofs;
                    295: 
                    296:     asm volatile("rpcc %0" : "=r"(cc));
                    297:     cur = cc;
                    298:     ofs = cc >> 32;
                    299:     return cur - ofs;
                    300: }
                    301: 
                    302: #else
                    303: /* The host CPU doesn't have an easily accessible cycle counter.
                    304:    Just return a monotonically increasing value.  This will be
                    305:    totally wrong, but hopefully better than nothing.  */
                    306: static inline int64_t cpu_get_real_ticks (void)
                    307: {
                    308:     static int64_t ticks = 0;
                    309:     return ticks++;
                    310: }
                    311: #endif
                    312: 
                    313: #ifdef CONFIG_PROFILER
                    314: static inline int64_t profile_getclock(void)
                    315: {
                    316:     return cpu_get_real_ticks();
                    317: }
                    318: 
                    319: extern int64_t qemu_time, qemu_time_start;
                    320: extern int64_t tlb_flush_time;
                    321: extern int64_t dev_time;
                    322: #endif
                    323: 
1.1       root      324: #endif

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