mach.subproj/mach_absolute_time.c

   1 #include <stdint.h>
   2 #include <mach/clock.h>
   3
   4 extern mach_port_t clock_port;
   5
   6 uint64_t mach_absolute_time(void) {
   7 #if defined(__ppc__)
   8         __asm__ volatile("0: mftbu r3");
   9         __asm__ volatile("mftb r4");
  10         __asm__ volatile("mftbu r0");
  11         __asm__ volatile("cmpw r0,r3");
  12         __asm__ volatile("bne- 0b");
  13 #else
  14         mach_timespec_t now;
  15         (void)clock_get_time(clock_port, &now);
  16         return (uint64_t)now.tv_sec * NSEC_PER_SEC + now.tv_nsec;
  17 #endif
  18 }
  19