switch mmu context when jump into kernel

[Wang Yong]

powerpc 4xx use mmu context(called TID(0~255)) when translate virtual
addr to physical addr. a SPR named PID hold this context, so i think
once i enable the addr translate, i have to set PID to
current->mm->context
to make translating work correctly. and it should be set to 0 when
interrupt or system call arise.
but after studying the kernel source i downloaded from tivo for a long
time, i don't find any code to do that job. i think it mostly should be
in these place: transfer_to_handler and int_return but it not. is the
kernel missing something?

i am sorry if i post this message twice, my netscape got some problem.

Wang


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