Annotation of qemu/qemu-timer.h, revision 1.1.1.7

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: 
1.1.1.7 ! root        8: #ifdef __FreeBSD__
        !             9: #include <sys/param.h>
1.1.1.4   root       10: #endif
1.1.1.3   root       11: 
1.1       root       12: /* timers */
                     13: 
1.1.1.5   root       14: #define SCALE_MS 1000000
                     15: #define SCALE_US 1000
                     16: #define SCALE_NS 1
                     17: 
1.1       root       18: typedef struct QEMUClock QEMUClock;
                     19: typedef void QEMUTimerCB(void *opaque);
                     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: extern QEMUClock *rt_clock;
                     26: 
                     27: /* The virtual clock is only run during the emulation. It is stopped
                     28:    when the virtual machine is stopped. Virtual timers use a high
                     29:    precision clock, usually cpu cycles (use ticks_per_sec). */
                     30: extern QEMUClock *vm_clock;
                     31: 
1.1.1.2   root       32: /* The host clock should be use for device models that emulate accurate
                     33:    real time sources. It will continue to run when the virtual machine
                     34:    is suspended, and it will reflect system time changes the host may
                     35:    undergo (e.g. due to NTP). The host clock has the same precision as
                     36:    the virtual clock. */
                     37: extern QEMUClock *host_clock;
                     38: 
1.1.1.3   root       39: int64_t qemu_get_clock_ns(QEMUClock *clock);
1.1.1.6   root       40: int64_t qemu_clock_has_timers(QEMUClock *clock);
                     41: int64_t qemu_clock_expired(QEMUClock *clock);
                     42: int64_t qemu_clock_deadline(QEMUClock *clock);
1.1.1.7 ! root       43: void qemu_clock_enable(QEMUClock *clock, bool enabled);
1.1.1.5   root       44: void qemu_clock_warp(QEMUClock *clock);
                     45: 
                     46: void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier);
                     47: void qemu_unregister_clock_reset_notifier(QEMUClock *clock,
                     48:                                           Notifier *notifier);
1.1       root       49: 
1.1.1.5   root       50: QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
                     51:                           QEMUTimerCB *cb, void *opaque);
1.1       root       52: void qemu_free_timer(QEMUTimer *ts);
                     53: void qemu_del_timer(QEMUTimer *ts);
1.1.1.6   root       54: void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time);
1.1       root       55: void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
1.1.1.7 ! root       56: bool qemu_timer_pending(QEMUTimer *ts);
        !            57: bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
1.1.1.6   root       58: uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts);
1.1       root       59: 
1.1.1.7 ! root       60: void qemu_run_timers(QEMUClock *clock);
1.1.1.3   root       61: void qemu_run_all_timers(void);
                     62: void configure_alarms(char const *opt);
                     63: void init_clocks(void);
                     64: int init_timer_alarm(void);
                     65: 
1.1.1.5   root       66: int64_t cpu_get_ticks(void);
                     67: void cpu_enable_ticks(void);
                     68: void cpu_disable_ticks(void);
                     69: 
                     70: static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb,
                     71:                                            void *opaque)
                     72: {
                     73:     return qemu_new_timer(clock, SCALE_NS, cb, opaque);
                     74: }
                     75: 
                     76: static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock, QEMUTimerCB *cb,
                     77:                                            void *opaque)
                     78: {
                     79:     return qemu_new_timer(clock, SCALE_MS, cb, opaque);
                     80: }
                     81: 
                     82: static inline int64_t qemu_get_clock_ms(QEMUClock *clock)
                     83: {
                     84:     return qemu_get_clock_ns(clock) / SCALE_MS;
                     85: }
                     86: 
1.1.1.2   root       87: static inline int64_t get_ticks_per_sec(void)
                     88: {
                     89:     return 1000000000LL;
                     90: }
1.1       root       91: 
1.1.1.4   root       92: /* real time host monotonic timer */
                     93: static inline int64_t get_clock_realtime(void)
                     94: {
                     95:     struct timeval tv;
                     96: 
                     97:     gettimeofday(&tv, NULL);
                     98:     return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
                     99: }
                    100: 
                    101: /* Warning: don't insert tracepoints into these functions, they are
                    102:    also used by simpletrace backend and tracepoints would cause
                    103:    an infinite recursion! */
                    104: #ifdef _WIN32
                    105: extern int64_t clock_freq;
                    106: 
                    107: static inline int64_t get_clock(void)
                    108: {
                    109:     LARGE_INTEGER ti;
                    110:     QueryPerformanceCounter(&ti);
                    111:     return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
                    112: }
                    113: 
                    114: #else
                    115: 
                    116: extern int use_rt_clock;
                    117: 
                    118: static inline int64_t get_clock(void)
                    119: {
                    120: #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
                    121:     || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
                    122:     if (use_rt_clock) {
                    123:         struct timespec ts;
                    124:         clock_gettime(CLOCK_MONOTONIC, &ts);
                    125:         return ts.tv_sec * 1000000000LL + ts.tv_nsec;
                    126:     } else
                    127: #endif
                    128:     {
                    129:         /* XXX: using gettimeofday leads to problems if the date
                    130:            changes, so it should be avoided. */
                    131:         return get_clock_realtime();
                    132:     }
                    133: }
                    134: #endif
1.1.1.3   root      135: 
1.1       root      136: void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
                    137: void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
                    138: 
1.1.1.3   root      139: /* icount */
                    140: int64_t cpu_get_icount(void);
1.1.1.6   root      141: int64_t cpu_get_clock(void);
1.1.1.3   root      142: 
                    143: /*******************************************/
                    144: /* host CPU ticks (if available) */
                    145: 
                    146: #if defined(_ARCH_PPC)
                    147: 
                    148: static inline int64_t cpu_get_real_ticks(void)
                    149: {
                    150:     int64_t retval;
                    151: #ifdef _ARCH_PPC64
                    152:     /* This reads timebase in one 64bit go and includes Cell workaround from:
                    153:        http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
                    154:     */
                    155:     __asm__ __volatile__ ("mftb    %0\n\t"
                    156:                           "cmpwi   %0,0\n\t"
                    157:                           "beq-    $-8"
                    158:                           : "=r" (retval));
                    159: #else
                    160:     /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
                    161:     unsigned long junk;
                    162:     __asm__ __volatile__ ("mfspr   %1,269\n\t"  /* mftbu */
                    163:                           "mfspr   %L0,268\n\t" /* mftb */
                    164:                           "mfspr   %0,269\n\t"  /* mftbu */
                    165:                           "cmpw    %0,%1\n\t"
                    166:                           "bne     $-16"
                    167:                           : "=r" (retval), "=r" (junk));
                    168: #endif
                    169:     return retval;
                    170: }
                    171: 
                    172: #elif defined(__i386__)
                    173: 
                    174: static inline int64_t cpu_get_real_ticks(void)
                    175: {
                    176:     int64_t val;
                    177:     asm volatile ("rdtsc" : "=A" (val));
                    178:     return val;
                    179: }
                    180: 
                    181: #elif defined(__x86_64__)
                    182: 
                    183: static inline int64_t cpu_get_real_ticks(void)
                    184: {
                    185:     uint32_t low,high;
                    186:     int64_t val;
                    187:     asm volatile("rdtsc" : "=a" (low), "=d" (high));
                    188:     val = high;
                    189:     val <<= 32;
                    190:     val |= low;
                    191:     return val;
                    192: }
                    193: 
                    194: #elif defined(__hppa__)
                    195: 
                    196: static inline int64_t cpu_get_real_ticks(void)
                    197: {
                    198:     int val;
                    199:     asm volatile ("mfctl %%cr16, %0" : "=r"(val));
                    200:     return val;
                    201: }
                    202: 
                    203: #elif defined(__ia64)
                    204: 
                    205: static inline int64_t cpu_get_real_ticks(void)
                    206: {
                    207:     int64_t val;
                    208:     asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory");
                    209:     return val;
                    210: }
                    211: 
                    212: #elif defined(__s390__)
                    213: 
                    214: static inline int64_t cpu_get_real_ticks(void)
                    215: {
                    216:     int64_t val;
                    217:     asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc");
                    218:     return val;
                    219: }
                    220: 
                    221: #elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
                    222: 
                    223: static inline int64_t cpu_get_real_ticks (void)
                    224: {
                    225: #if defined(_LP64)
                    226:     uint64_t        rval;
                    227:     asm volatile("rd %%tick,%0" : "=r"(rval));
                    228:     return rval;
                    229: #else
                    230:     union {
                    231:         uint64_t i64;
                    232:         struct {
                    233:             uint32_t high;
                    234:             uint32_t low;
                    235:         }       i32;
                    236:     } rval;
                    237:     asm volatile("rd %%tick,%1; srlx %1,32,%0"
                    238:                  : "=r"(rval.i32.high), "=r"(rval.i32.low));
                    239:     return rval.i64;
                    240: #endif
                    241: }
                    242: 
                    243: #elif defined(__mips__) && \
                    244:     ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__))
                    245: /*
                    246:  * binutils wants to use rdhwr only on mips32r2
                    247:  * but as linux kernel emulate it, it's fine
                    248:  * to use it.
                    249:  *
                    250:  */
                    251: #define MIPS_RDHWR(rd, value) {                         \
                    252:         __asm__ __volatile__ (".set   push\n\t"         \
                    253:                               ".set mips32r2\n\t"       \
                    254:                               "rdhwr  %0, "rd"\n\t"     \
                    255:                               ".set   pop"              \
                    256:                               : "=r" (value));          \
                    257:     }
                    258: 
                    259: static inline int64_t cpu_get_real_ticks(void)
                    260: {
                    261:     /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */
                    262:     uint32_t count;
                    263:     static uint32_t cyc_per_count = 0;
                    264: 
                    265:     if (!cyc_per_count) {
                    266:         MIPS_RDHWR("$3", cyc_per_count);
                    267:     }
                    268: 
                    269:     MIPS_RDHWR("$2", count);
                    270:     return (int64_t)(count * cyc_per_count);
                    271: }
                    272: 
                    273: #elif defined(__alpha__)
                    274: 
                    275: static inline int64_t cpu_get_real_ticks(void)
                    276: {
                    277:     uint64_t cc;
                    278:     uint32_t cur, ofs;
                    279: 
                    280:     asm volatile("rpcc %0" : "=r"(cc));
                    281:     cur = cc;
                    282:     ofs = cc >> 32;
                    283:     return cur - ofs;
                    284: }
                    285: 
                    286: #else
                    287: /* The host CPU doesn't have an easily accessible cycle counter.
                    288:    Just return a monotonically increasing value.  This will be
                    289:    totally wrong, but hopefully better than nothing.  */
                    290: static inline int64_t cpu_get_real_ticks (void)
                    291: {
                    292:     static int64_t ticks = 0;
                    293:     return ticks++;
                    294: }
                    295: #endif
                    296: 
                    297: #ifdef CONFIG_PROFILER
                    298: static inline int64_t profile_getclock(void)
                    299: {
                    300:     return cpu_get_real_ticks();
                    301: }
                    302: 
                    303: extern int64_t qemu_time, qemu_time_start;
                    304: extern int64_t tlb_flush_time;
                    305: extern int64_t dev_time;
                    306: #endif
                    307: 
1.1       root      308: #endif

unix.superglobalmegacorp.com