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The assembler code to set the global descriptor table is
architecture-specific and therefore moved to arch.{c,h}.
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ker_dbg writes a string to the terminal. In future, it might also write
to a text file, to the serial console or other channels.
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Add regset16 and regset32 to the existing regset8 in arch.h, and
prtset{8,16,32} and prtget{8,16,32} to access ports.
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Add a simple Global Descriptor Table implementation based on [0].
[0] http://www.lowlevel.eu/wiki/Global_Descriptor_Table
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