Method for managing I/O buffers in shared storage by structuring

Details Method for managing I/O buffers in shared storage by structuring Method for managing I/O buffers in shared storage by structuring

1996-05-23

1998-09-15

Shin, Christopher B.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711152, 711173, 711209, 395856, G06F 1214

Patent

active

058095462

ABSTRACT:
I/O protection key processes for protecting storage blocks (page frames) in a shared main storage against unwanted I/O accesses. Independent CP (central processor) key protection may optionally be provided to protect the same storage against unwanted CP accesses. Processes are included for initializing, and addressing I/O buffers used by the I/O programs; each I/O buffer is comprised of a contiguous set of the blocks (page frames). The I/O keys may be used independently of any CP keys provided for protecting the same blocks against unwanted accesses by any CP in the system. The I/O keys must be supported by a hardware I/O storage array when only real (or absolute) addressing is used by I/O programs. However, the CP keys may be supported by either real CP keys in a second hardware key array; or alternatively the CP keys may be provided as virtual CP keys in a field in each page table entry (which is used for translating CP virtual addresses to CP real addresses). The separate I/O and CPU access protection functions may each include any or all of: write protection, read protection, and storage key protection for page frames.

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