=> R0 = r_bpp value
R2 = r_charw value
R3 = r_charh value
<= R2 = number of bytes per cache line (r_cbpl)
R3 = number of bytes per cached character (r_cbpc)
This SWI works out the values of r_cbpl, r_cbpc from r_charw, r_charh, r_bpp
in the manner defined under the help text on r_caddr. Ie, r_cbpl is either
1,2, or a multiple of 4 and r_cbpc = r_charh * r_cbpl.
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