Is there a virtual/system clock running independently when a computer is booted?
How can we read that value?
Is there a virtual/system clock running independently when a computer is booted? How can
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Is there a virtual/system clock running independently when a computer is booted?
How can we read that value?
Use the RDTSC x86 instruction, it reads the clocks since the system-start.
Edit:
On x86-64 targets the use of inline assembly is not possible anymore, use either intrinics or a external linked object file which was generated by an assembler. Do not forget to flush the processor pipeline before using this instruction.