libelwix/src/time.c - diff

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-version 1.2, 2013/03/07 16:24:32
+version 1.3, 2013/06/19 00:11:16
  Line 261  time_Parse(const char *csTime)
                  elwix_SetErr(EINVAL, "Invalid date/time format");
          return tim;
  }
+ /*
+  * time_rdtsc() - Get TSC timer value from CPU
+  *
+  * return: TSC in nanoseconds
+  */
+ uint64_t
+ time_rdtsc(void)
+ {
+ #if defined(i386) || defined(__i386__)
+         /* i386 */
+         uint32_t hi, lo;
+         asm volatile("rdtsc" : "=d" (hi), "=a" (lo));
+         return (((uint64_t) hi << 32) | (uint64_t) lo);
+ #elif defined(amd64) || defined(__amd64__) || \
+         defined(x86_64) || defined(__x86_64__)
+         /* amd64 */
+         uint64_t res;
+         asm volatile("rdtsc" : "=a" (res));
+         return res;
+ #elif
+         /* unsupported for this architecture, get time by ordinary way */
+         struct timespec ts = { 0, 0LL };
+         uint64_t res;
+         clock_gettime(CLOCK_UPTIME_PRECISE, &ts);
+         return ((uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec);
+ #endif
+ }