VCache_Register

Registers an FSD with cache. Uses EAX, flags.

• Returns in AL a one-byte identifier that the FSD will use to identify itself when issuing FindBlock requests.

On entry, ESI contains the value of a buffer discard procedure. This value cannot be -1.

On entry, ECX contains the minimum number of blocks to reserve for this FSD.

An FSD must call this function to register a buffer discard function with VCache.

This service can only be called during DEVICE_INIT.