将 ioport 形式的硬件映射到 vDSO 功能

Question

I am using SAMA5d2 CPU with Linux, and want to have access to ioport from vdso function. How shoul I map ioport to userspace memory to get access to ioport in vdso function which calls from userspace? Actualy I want to implement getting of timer cycles in tcb_clksrc timer. The kernel have implementation only for arch_arm_timer clocksource, and I want to make implementation for tcb_clksrc timer to use it in my SAMA

Answer 1

I found solution in evl project In this project new clocksource USER_MIMO is implemented, and any clock driver can register in it as a hardware clock. I ported tihs interface to my kernel and it's works file