| 192,8 → 192,6 |
|---|
| start_8253 = inp(0x42); |
| start_8253 |= inp(0x42) << 8; |
| barrier(); |
| rdtscll(start); |
| barrier(); |
| |
| do { |
| |
| 210,14 → 208,12 |
|---|
| end_8253 = inp(0x42); |
| end_8253 |= inp(0x42) << 8; |
| barrier(); |
| rdtscll(end); |
| barrier(); |
| |
| //Delta TSC |
| dtsc = end - start; |
| |
| //Delta PIT |
| delta_8253 = start_8253 - end_8253; |
| delta_8253 = start_8253 - end_8253 - 2; |
| |
| if (delta_8253 > 0x20000) { |
| message("Error calculating Delta PIT\n"); |
| 228,7 → 224,7 |
|---|
| |
| message("Delta PIT = %10ld\n",(long)delta_8253); |
| |
| clk_per_msec = dtsc * CLOCK_TICK_RATE / delta_8253 * 100002 / 100000000; |
| clk_per_msec = dtsc * CLOCK_TICK_RATE / delta_8253 / 1000; |
| |
| message("Calibrated Clk_per_msec = %10ld\n",(long)clk_per_msec); |
| |