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old-style pmax polled input for cn_getc(). Needed because the input side of rcons is not initialized in time for GENERIC kernels to use it to read a root/swap devicename from /dev/console.
old-style pmax polled input for cn_getc(). Needed because the input side of rcons is not initialized in time for GENERIC kernels to use it to read a root/swap devicename from /dev/console.