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Lines 134-144
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/* |
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/* |
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* Calculate TSC frequency using information from the CPUID leaf 0x15 |
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* Calculate TSC frequency using information from the CPUID leaf 0x15 |
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* 'Time Stamp Counter and Nominal Core Crystal Clock'. If leaf 0x15 |
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* 'Time Stamp Counter and Nominal Core Crystal Clock'. It should be |
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* is not functional, as it is on Skylake/Kabylake, try 0x16 'Processor |
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* Frequency Information'. Leaf 0x16 is described in the SDM as |
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* informational only, but if 0x15 did not work, and TSC calibration |
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* is disabled, it is the best we can get at all. It should still be |
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* an improvement over the parsing of the CPU model name in |
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* an improvement over the parsing of the CPU model name in |
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* tsc_freq_intel(), when available. |
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* tsc_freq_intel(), when available. |
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*/ |
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*/ |
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Lines 150-169
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if (cpu_high < 0x15) |
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if (cpu_high < 0x15) |
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return (false); |
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return (false); |
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do_cpuid(0x15, regs); |
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do_cpuid(0x15, regs); |
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if (regs[0] != 0 && regs[1] != 0 && regs[2] != 0) { |
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if (regs[0] == 0 || regs[1] == 0 || regs[2] == 0) |
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tsc_freq = (uint64_t)regs[2] * regs[1] / regs[0]; |
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return (true); |
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} |
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if (cpu_high < 0x16) |
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return (false); |
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return (false); |
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do_cpuid(0x16, regs); |
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tsc_freq = (uint64_t)regs[2] * regs[1] / regs[0]; |
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if (regs[0] != 0) { |
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return (true); |
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tsc_freq = (uint64_t)regs[0] * 1000000; |
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return (true); |
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} |
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return (false); |
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} |
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} |
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static void |
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static void |