Support Spike's HTIF for console IO #16
Merged
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Discover and use the Spike RISC-V simulator's Host Target Interface (HTIF) to read and write to the console.
Also include documentation on running Diosix in Spike and on real hardware (specifically, the SiFive HiFive Unleashed). Note, support for these targets is not complete: the hypervisor needs to trap and emulate unaligned memory accesses.