| static uint64_t timeRDTSC(void)␊ |
| {␊ |
| ␉int␉␉attempts = 0;␊ |
| ␉uint64_t latchTime;␊ |
| ␉uint64_t ␉latchTime;␊ |
| ␉uint64_t␉saveTime,intermediate;␊ |
| ␉unsigned int timerValue, lastValue;␊ |
| ␉unsigned int␉timerValue, lastValue;␊ |
| ␉//boolean_t␉int_enabled;␊ |
| ␉/*␊ |
| ␉ * Table of correction factors to account for␊ |
|
| ␉␉ROUND64(SAMPLE_MULTIPLIER/(double)(SAMPLE_CLKS_INT-5))␊ |
| ␉};␊ |
| ␊ |
| ␉//int_enabled = ml_set_interrupts_enabled(FALSE);␊ |
| ␉//int_enabled = ml_set_interrupts_enabled(false);␊ |
| ␊ |
| restart:␊ |
| ␉if (attempts >= 9) // increase to up to 9 attempts.␊ |
| ␉{␊ |
| ␉ // This will flash-reboot. TODO: Use tscPanic instead.␊ |
| ␉␉// This will flash-reboot. TODO: Use tscPanic instead.␊ |
| ␉␉printf("Timestamp counter calibation failed with %d attempts\n", attempts);␊ |
| ␉}␊ |
| ␉attempts++;␊ |
| ␉enable_PIT2();␉␉// turn on PIT2␊ |
| ␉set_PIT2(0);␉␉// reset timer 2 to be zero␊ |
| ␉latchTime = rdtsc64();␉// get the time stamp to time ␊ |
| ␉latchTime = rdtsc64();␉// get the time stamp to time␊ |
| ␉latchTime = get_PIT2(&timerValue) - latchTime; // time how long this takes␊ |
| ␉set_PIT2(SAMPLE_CLKS_INT);␉// set up the timer for (almost) 1/20th a second␊ |
| ␉saveTime = rdtsc64();␉// now time how long a 20th a second is...␊ |
|
| ␉{␊ |
| ␉␉do_cpuid(5, p->CPU.CPUID[CPUID_5]);␊ |
| ␉}␊ |
| ␊ |
| ␉if (p->CPU.CPUID[CPUID_0][0] >= 6)␉// Thermal/Power␊ |
| ␉{␊ |
| ␉␉do_cpuid(6, p->CPU.CPUID[CPUID_6]);␊ |
| ␉}␊ |
| ␊ |
| ␉do_cpuid(0x80000000, p->CPU.CPUID[CPUID_80]);␊ |
| ␊ |
| ␉if ((p->CPU.CPUID[CPUID_80][0] & 0x0000000f) >= 8)␊ |
| ␉{␊ |
| ␉␉do_cpuid(0x80000008, p->CPU.CPUID[CPUID_88]);␊ |
|
| ␉// MSR is *NOT* available on the Intel Atom CPU␊ |
| ␉if ((p->CPU.Model == CPUID_MODEL_ATOM) && (strstr(p->CPU.BrandString, "270")))␊ |
| ␉{␊ |
| ␉␉␉p->CPU.NoCores␉␉= 1;␊ |
| ␉␉␉p->CPU.NoThreads␉= 2;␊ |
| ␉␉p->CPU.NoCores␉␉= 1;␊ |
| ␉␉p->CPU.NoThreads␉= 2;␊ |
| ␉}␊ |
| ␊ |
| ␉/* setup features */␊ |
