io_getevents

read asynchronous I/O events from the completion queue

sys_io_getevents(aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct __kernel_timespec *timeout)

register	value
`rax`	208, the syscall number
`rdi`	aio_context_t ctx_id
`rsi`	long min_nr
`rdx`	long nr
`r10`	struct io_event *events
`r8`	struct __kernel_timespec *timeout
`rax`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures