The StorageManagement class has 2 roles:
1. During boot, it should find all storage controllers in the machine,
and then determine what is the boot device.
2. Later on boot, it is a registrar of all storage controllers and
storage devices. Thus, it could be used to show information about these
devices when implemented.
This change allows the user to specify a boot driver other than /dev/hda
and if it's connected in the machine - it will boot.
Previously, the indexing scheme was that 0 is Primary-Master, 1 is
Primary-Slave, 2 is Secondary-Master, 3 is Secondary-Slave.
Instead of merely matching between numbers to the channel & position,
the IDEController code will try to find all available drives connected to
the two channels, then it will create a Vector with nonnull RefPtr to
them. Then we take use the given index with this Vector.
This new subsystem is somewhat replacing the IDE disk code we had with a
new flexible design.
StorageDevice is a generic class that represent a generic storage
device. It is meant that specific storage hardware will override the
interface. StorageController is a generic class that represent
a storage controller that can be found in a machine.
The IDEController class governs two IDEChannels. An IDEChannel is
responsible to manage the master & slave devices of the channel,
therefore an IDEChannel is an IRQHandler.
