htimedelta
Hypervisor time delta
The htimedelta CSR is a 64-bit read/write register that contains the delta between the value of the time CSR and the value returned in VS-mode or VU-mode. That is, reading the time CSR in VS or VU mode returns the sum of the contents of htimedelta and the actual value of time.
Because overflow is ignored when summing htimedelta and time, large values of htimedelta may be used to represent negative time offsets. |