Abstract: In a logically partitioned computer system, a partition manager maintains and controls master encryption keys for the different partitions. Preferably, processes executing within a partition have no direct access to real memory, addresses in the partition's memory space being mapped to real memory by the partition manager. The partition manager maintains master keys at real memory addresses inaccessible to processes executing in the partitions. Preferably, a special hardware register stores a pointer to the current key, and is read only by a hardware crypto-engine to encrypt/decrypt data. The crypto-engine returns the encrypted/decrypted data, but does not output the key itself or its location.

Abstract: In a logically partitioned computer system, a partition manager maintains and controls master encryption keys for the different partitions. Preferably, processes executing within a partition have no direct access to real memory, addresses in the partition's memory space being mapped to real memory by the partition manager. The partition manager maintains master keys at real memory addresses inaccessible to processes executing in the partitions. Preferably, a special hardware register stores a pointer to the current key, and is read only by a hardware crypto-engine to encrypt/decrypt data. The crypto-engine returns the encrypted/decrypted data, but does not output the key itself or its location.

Abstract: A system for supporting graphics display sessions on remote terminals contains a processing subsystem dedicated to graphics support. Applications execute on a central processor, and display related graphics commands are executed on the separate graphics controller subsystem. The graphics subsystem is preferably connected to multiple remote terminals over a network, and communicates with them without requiring all work to be performed by the central processor which is executing the applications.

Abstract: A workstation controller (WSC) performance monitor for locating performance bottlenecks is disclosed. The user notifies the host that he wants to start performance measurements. The host notifies each of the workstation controllers to begin collecting data that can be used to determine processor performance and communications line performance for each workstation controller. This data is collected in counters that reside in the storage of each of the workstation controllers. In the preferred embodiment, this data is periodically sent to a data base contained in the storage of the host. When the user specified length of time to collect data has expired, the host informs each of the connected workstation controllers to stop taking measurements. The data contained in the counters is sent to the database in the host and the host calculates processor utilization and communications line utilization for each of the connected workstation controllers.