hi all... i am working with AT91SAM9261....we have developed our own custom board based on this atmel microcontroller...we are also working with linux kernel 2.6.19 on the board...my product has got a non standard KBoard.....so i want figure out a interrupt scheme for the same..

i did one thing...in the bootstrap code, i have enabled the port pin's of port A.as input with interrupt... i can read the source of interrupt occurring via kernel....as dedicated functions are there for the chip.. but my problem is..my handler is there in the user address space...but interrupt is read by kernel...so i want to write a handler,at the exception vector address of IRQ,so that i jump from kernel to user address space and execute my corresponding handler in the application...how can i change the handler routine at the exception address...should i write a API for the same..or are there any special provisions provided in the kernel for the same...or can i do it U-BOOT

i am in big confusion...need help at the early...i am thinking in right direction?????