bm-armv8

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Timers

1. https://developer.arm.com/documentation/102379/0000/The-processor-timers
2. https://developer.arm.com/documentation/102374/0101/Data-processing---arithmetic-and-logic-operations

Each timer has three registers:

1. ctl: control register
2. cval: comparator value
3. tval: timer value

EL1 virtual timer registers has a prefix CNTV, so registers are:

1. CNTV_CTL_EL0, CNTV_CVAL_EL0, CNTV_TVAL_EL0