Relocatable storage protect keys for system main memory

Details Relocatable storage protect keys for system main memory Relocatable storage protect keys for system main memory

2006-09-15

2009-12-15

Kim, Hong (Department: 2185)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S763000, C711S170000, C711S164000

Reexamination Certificate

active

07634708

ABSTRACT:
Storage protection keys and system data share the same physical storage. The key region is dynamically relocatable by firmware. A Configuration Array is used to map the absolute address of the key region in to its physical address. The absolute address of keys can be fixed even though the physical location of the keys is relocated into a different region. A triple-detect double correct ECC scheme is used to protect keys. The ECC scheme is different from regular data in the storage and can be used to detect illegal access. Extra firmware and hardware is also designed to restrain customer's applications from directly accessing keys. With the key region being relocatable, the firmware could move the key region away from a known faulty area in a memory to improve system RAS. We also achieved the commonality objective that key memory device can use the same memory devices with other server systems that do not use keys.

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