1. 调度 Event
2. 根据counter value,触发中断
3. 支持Virtualization 扩展
Generic Timer提供的system counter:
(1) 最少56bit 宽
(2) Frequency : 1--50MHz
Supports one or more alternative operating mode in which it increments by larger amounts at a lower freqency
(typically for power-saving)
(3) Roll-over : 至少40年,才会发生
(4) 精度: ARM本身不规定,但建议24小时内,误差不超过10秒
(5) Start-up : 从0开始计数
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