In which of the following situations will the MicroBlaze CPU enable maskable interrupts?
以下哪几种情况下，MicroBlaze CPU将使能可屏蔽中断？
A、Interrupt request input detected
检测到中断请求输入
B、enter interrupt service routine
进入中断服务程序
C、execute （执行) microblaze_enable_interrupt()；
D、return from interrupt service routine
从中断服务程序返回