Make the RAA infrastructure a bit cleaner, make it support 64-bit
indicies, and reduce the memory overhead of a sparse or small RAA --
the old code would allocate a *minimum* of 256K for each RAA. The new
code reduces that to 16K, and will not mandatorily allocate an entry
in the zero position.
The new shift, 11, was chosen so that a 32-bit RAA value will need 3
layers and a 64-bit value 6 layers, without excessive waste.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
903ea54857