System and method for I/O access mode selection

Details System and method for I/O access mode selection System and method for I/O access mode selection

1997-03-21

1999-09-28

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

710 10, G06F 1310, G06F 1312

Patent

active

059580224

ABSTRACT:
A system and method for controlling the operation of an adapter operable in a plurality of modes, such as I/O mode and memory mapped mode. A generic adapter access routine is initialized with global data objects as pointers to corresponding sets of alternative adapter functions, and the adapter is initialized to function in a first mode and the pointers mapped to a corresponding current set of adapter functions. Device driver code calls to global data objects are executed by reference to the current set of adapter functions. Responsive to a request to switch modes, the adapter is switched to a second mode and the pointers remapped to a corresponding second set of adapter functions, and execution of device driver code calls to the global data objects continues.

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patent: 5701491 (1997-12-01), Dunn et al.
M.W. Dotson, et al "Switchable Mapping of I/O Card Registers Into I/O Or Memory Space", IBM Technical Disclosure Bulletin (TDB), vol. 37, No. 01, Jan. 1994, pp. 317-318.

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