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64bit math in the kernel

Is it possible and if it is, what is the proper way to handle 64 bit math in
the kernel? Currently, if I have code that multiplies two UInt64 values, I
get a bogus value if the result is bigger than what can be contained in 32
bits. On the host side there is the Math64.h file which provide functions
for doing 64bit math, is there something equivalent for the kernel side or
do we have to roll our own.

Thanks,

Rob
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