File:  [Qemu by Fabrice Bellard] / qemu / qemu-timer.h
Revision 1.1.1.7 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:35:21 2018 UTC (23 months, 2 weeks ago) by root
Branches: qemu, MAIN
CVS tags: qemu1101, HEAD
qemu 1.1.1

    1: #ifndef QEMU_TIMER_H
    2: #define QEMU_TIMER_H
    3: 
    4: #include "qemu-common.h"
    5: #include "main-loop.h"
    6: #include "notify.h"
    7: 
    8: #ifdef __FreeBSD__
    9: #include <sys/param.h>
   10: #endif
   11: 
   12: /* timers */
   13: 
   14: #define SCALE_MS 1000000
   15: #define SCALE_US 1000
   16: #define SCALE_NS 1
   17: 
   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: 
   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: 
   39: int64_t qemu_get_clock_ns(QEMUClock *clock);
   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);
   43: void qemu_clock_enable(QEMUClock *clock, bool enabled);
   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);
   49: 
   50: QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
   51:                           QEMUTimerCB *cb, void *opaque);
   52: void qemu_free_timer(QEMUTimer *ts);
   53: void qemu_del_timer(QEMUTimer *ts);
   54: void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time);
   55: void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time);
   56: bool qemu_timer_pending(QEMUTimer *ts);
   57: bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time);
   58: uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts);
   59: 
   60: void qemu_run_timers(QEMUClock *clock);
   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: 
   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: 
   87: static inline int64_t get_ticks_per_sec(void)
   88: {
   89:     return 1000000000LL;
   90: }
   91: 
   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
  135: 
  136: void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
  137: void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);
  138: 
  139: /* icount */
  140: int64_t cpu_get_icount(void);
  141: int64_t cpu_get_clock(void);
  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: 
  308: #endif

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