[SeaBIOS] Question on virtual block device

[Daniel Castro]

Hello All,

I am connecting my front and back for a block device.
I have collected from xenstore sectors, sector-size. But I also need:
    u16 heads;      // # heads
    u16 cylinders;  // # cylinders
    u16 spt;        // # sectors / track
I guess from the SeaBIOS perspective they are required, but from the
xen perspective how can I get them? pure math/translation?

Thanks,

Daniel