[SeaBIOS] [PATCH] make seabios 386/486 friendly

[Rudolf Marek]

Hello,

Following patch makes seabios friendly to 386/486 CPUs, providing a way how to 
emulate the CPUID instruction and using TSC only if CPU actually supports the 
TSC. Otherwise it uses TSC emulation mode which is similar to what is used in 
Xenomai except we use timer0 here.

With this patch it is able to run on 486SX class system aka bifferboard together 
with coreboot.

Signed-off-by: Rudolf Marek <r.marek at assembler.cz>

Please let me know if you there is something you don't like in that patch.

Thanks
Rudolf
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