1 #ifndef QEMU_TIMER_H 2 #define QEMU_TIMER_H 3 4 #include "qemu-common.h" 5 #include <time.h> 6 #include <sys/time.h> 7 8 #ifdef _WIN32 9 #include <windows.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(QEMUClock *clock); 40 int64_t qemu_get_clock_ns(QEMUClock *clock); 41 void qemu_clock_enable(QEMUClock *clock, int enabled); 42 void qemu_clock_warp(QEMUClock *clock); 43 44 QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale, 45 QEMUTimerCB *cb, void *opaque); 46 47 void qemu_free_timer(QEMUTimer *ts); 48 void qemu_del_timer(QEMUTimer *ts); 49 void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time); 50 int qemu_timer_pending(QEMUTimer *ts); 51 int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time); 52 int qemu_timer_alarm_pending(void); 53 54 void qemu_run_all_timers(void); 55 int qemu_alarm_pending(void); 56 int64_t qemu_next_icount_deadline(void); 57 int64_t qemu_next_deadline(void); 58 void configure_alarms(char const *opt); 59 void configure_icount(const char *option); 60 int qemu_calculate_timeout(void); 61 void init_clocks(void); 62 int init_timer_alarm(void); 63 void quit_timers(void); 64 65 int64_t cpu_get_ticks(void); 66 void cpu_enable_ticks(void); 67 void cpu_disable_ticks(void); 68 69 static inline QEMUTimer *qemu_new_timer_ns(QEMUClock *clock, QEMUTimerCB *cb, 70 void *opaque) 71 { 72 return qemu_new_timer(clock, SCALE_NS, cb, opaque); 73 } 74 75 static inline QEMUTimer *qemu_new_timer_ms(QEMUClock *clock, QEMUTimerCB *cb, 76 void *opaque) 77 { 78 return qemu_new_timer(clock, SCALE_MS, cb, opaque); 79 } 80 81 static inline int64_t qemu_get_clock_ms(QEMUClock *clock) 82 { 83 return qemu_get_clock_ns(clock) / SCALE_MS; 84 } 85 86 static inline int64_t get_ticks_per_sec(void) 87 { 88 return 1000000000LL; 89 } 90 91 /* real time host monotonic timer */ 92 static inline int64_t get_clock_realtime(void) 93 { 94 struct timeval tv; 95 96 gettimeofday(&tv, NULL); 97 return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); 98 } 99 100 /* Warning: don't insert tracepoints into these functions, they are 101 also used by simpletrace backend and tracepoints would cause 102 an infinite recursion! */ 103 #ifdef _WIN32 104 extern int64_t clock_freq; 105 106 static inline int64_t get_clock(void) 107 { 108 LARGE_INTEGER ti; 109 QueryPerformanceCounter(&ti); 110 return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq); 111 } 112 113 #else 114 115 extern int use_rt_clock; 116 117 static inline int64_t get_clock(void) 118 { 119 #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ 120 || defined(__DragonFly__) || defined(__FreeBSD_kernel__) 121 if (use_rt_clock) { 122 struct timespec ts; 123 clock_gettime(CLOCK_MONOTONIC, &ts); 124 return ts.tv_sec * 1000000000LL + ts.tv_nsec; 125 } else 126 #endif 127 { 128 /* XXX: using gettimeofday leads to problems if the date 129 changes, so it should be avoided. */ 130 return get_clock_realtime(); 131 } 132 } 133 #endif 134 135 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts); 136 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts); 137 138 /* ptimer.c */ 139 typedef struct ptimer_state ptimer_state; 140 typedef void (*ptimer_cb)(void *opaque); 141 142 ptimer_state *ptimer_init(QEMUBH *bh); 143 void ptimer_set_period(ptimer_state *s, int64_t period); 144 void ptimer_set_freq(ptimer_state *s, uint32_t freq); 145 void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload); 146 uint64_t ptimer_get_count(ptimer_state *s); 147 void ptimer_set_count(ptimer_state *s, uint64_t count); 148 void ptimer_run(ptimer_state *s, int oneshot); 149 void ptimer_stop(ptimer_state *s); 150 void qemu_put_ptimer(QEMUFile *f, ptimer_state *s); 151 void qemu_get_ptimer(QEMUFile *f, ptimer_state *s); 152 153 /* icount */ 154 int64_t qemu_icount_round(int64_t count); 155 extern int64_t qemu_icount; 156 extern int use_icount; 157 extern int icount_time_shift; 158 extern int64_t qemu_icount_bias; 159 int64_t cpu_get_icount(void); 160 161 /*******************************************/ 162 /* host CPU ticks (if available) */ 163 164 #if defined(_ARCH_PPC) 165 166 static inline int64_t cpu_get_real_ticks(void) 167 { 168 int64_t retval; 169 #ifdef _ARCH_PPC64 170 /* This reads timebase in one 64bit go and includes Cell workaround from: 171 http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html 172 */ 173 __asm__ __volatile__ ("mftb %0\n\t" 174 "cmpwi %0,0\n\t" 175 "beq- $-8" 176 : "=r" (retval)); 177 #else 178 /* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */ 179 unsigned long junk; 180 __asm__ __volatile__ ("mfspr %1,269\n\t" /* mftbu */ 181 "mfspr %L0,268\n\t" /* mftb */ 182 "mfspr %0,269\n\t" /* mftbu */ 183 "cmpw %0,%1\n\t" 184 "bne $-16" 185 : "=r" (retval), "=r" (junk)); 186 #endif 187 return retval; 188 } 189 190 #elif defined(__i386__) 191 192 static inline int64_t cpu_get_real_ticks(void) 193 { 194 int64_t val; 195 asm volatile ("rdtsc" : "=A" (val)); 196 return val; 197 } 198 199 #elif defined(__x86_64__) 200 201 static inline int64_t cpu_get_real_ticks(void) 202 { 203 uint32_t low,high; 204 int64_t val; 205 asm volatile("rdtsc" : "=a" (low), "=d" (high)); 206 val = high; 207 val <<= 32; 208 val |= low; 209 return val; 210 } 211 212 #elif defined(__hppa__) 213 214 static inline int64_t cpu_get_real_ticks(void) 215 { 216 int val; 217 asm volatile ("mfctl %%cr16, %0" : "=r"(val)); 218 return val; 219 } 220 221 #elif defined(__ia64) 222 223 static inline int64_t cpu_get_real_ticks(void) 224 { 225 int64_t val; 226 asm volatile ("mov %0 = ar.itc" : "=r"(val) :: "memory"); 227 return val; 228 } 229 230 #elif defined(__s390__) 231 232 static inline int64_t cpu_get_real_ticks(void) 233 { 234 int64_t val; 235 asm volatile("stck 0(%1)" : "=m" (val) : "a" (&val) : "cc"); 236 return val; 237 } 238 239 #elif defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__) 240 241 static inline int64_t cpu_get_real_ticks (void) 242 { 243 #if defined(_LP64) 244 uint64_t rval; 245 asm volatile("rd %%tick,%0" : "=r"(rval)); 246 return rval; 247 #else 248 union { 249 uint64_t i64; 250 struct { 251 uint32_t high; 252 uint32_t low; 253 } i32; 254 } rval; 255 asm volatile("rd %%tick,%1; srlx %1,32,%0" 256 : "=r"(rval.i32.high), "=r"(rval.i32.low)); 257 return rval.i64; 258 #endif 259 } 260 261 #elif defined(__mips__) && \ 262 ((defined(__mips_isa_rev) && __mips_isa_rev >= 2) || defined(__linux__)) 263 /* 264 * binutils wants to use rdhwr only on mips32r2 265 * but as linux kernel emulate it, it's fine 266 * to use it. 267 * 268 */ 269 #define MIPS_RDHWR(rd, value) { \ 270 __asm__ __volatile__ (".set push\n\t" \ 271 ".set mips32r2\n\t" \ 272 "rdhwr %0, "rd"\n\t" \ 273 ".set pop" \ 274 : "=r" (value)); \ 275 } 276 277 static inline int64_t cpu_get_real_ticks(void) 278 { 279 /* On kernels >= 2.6.25 rdhwr <reg>, $2 and $3 are emulated */ 280 uint32_t count; 281 static uint32_t cyc_per_count = 0; 282 283 if (!cyc_per_count) { 284 MIPS_RDHWR("$3", cyc_per_count); 285 } 286 287 MIPS_RDHWR("$2", count); 288 return (int64_t)(count * cyc_per_count); 289 } 290 291 #elif defined(__alpha__) 292 293 static inline int64_t cpu_get_real_ticks(void) 294 { 295 uint64_t cc; 296 uint32_t cur, ofs; 297 298 asm volatile("rpcc %0" : "=r"(cc)); 299 cur = cc; 300 ofs = cc >> 32; 301 return cur - ofs; 302 } 303 304 #else 305 /* The host CPU doesn't have an easily accessible cycle counter. 306 Just return a monotonically increasing value. This will be 307 totally wrong, but hopefully better than nothing. */ 308 static inline int64_t cpu_get_real_ticks (void) 309 { 310 static int64_t ticks = 0; 311 return ticks++; 312 } 313 #endif 314 315 #ifdef NEED_CPU_H 316 /* Deterministic execution requires that IO only be performed on the last 317 instruction of a TB so that interrupts take effect immediately. */ 318 static inline int can_do_io(CPUState *env) 319 { 320 if (!use_icount) 321 return 1; 322 323 /* If not executing code then assume we are ok. */ 324 if (!env->current_tb) 325 return 1; 326 327 return env->can_do_io != 0; 328 } 329 #endif 330 331 #ifdef CONFIG_PROFILER 332 static inline int64_t profile_getclock(void) 333 { 334 return cpu_get_real_ticks(); 335 } 336 337 extern int64_t qemu_time, qemu_time_start; 338 extern int64_t tlb_flush_time; 339 extern int64_t dev_time; 340 #endif 341 342 #endif 343
