5001c579ba
In uart_phyp_get(), when the internal buffer is empty, we make a hypercall to retrieve up to 16 bytes of input data from the hypervisor. As this is specified to be returned in BE format, we need to do a 64-bit byte swap on the first and second half of the data. If the buffer being passed in was insufficient to return the fetched data, we store the remainder in the internal buffer and use it to satisfy the following calls to uart_phyp_get() until it is drained. However, in this case, we were accidentally byteswapping the internal buffer again. Move the byteswapping code to just after the hypercall so it only gets swapped when we're filling the buffer. Fixes arrow keys in qemu on pseries, among other console oddities. Sponsored by: Tag1 Consulting, Inc. MFC after: 3 days
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