Uncoupling a central processing unit from its associated hardware for interaction with data handling apparatus alien to the operating system controlling said unit and hardware

In a data processing system,

• a first processing unit and hardware including a main storage and a plurality of I/O devices for executing programs having a first instruction architecture under control of a first virtual operating system,
• a second processing unit alien to said operating system, for executing programs having a different instruction architecture under control of a second virtual operating system differing from the first operating system,
• means including an application program in the first processing unit uncoupling the first processing unit from said hardware and coupling the first processing unit directly to the second processing unit, and
• means controlled by the first processing unit and the application program while that unit is uncoupled from said hardware for exchanging at least one of command and data information between the second unit and the first unit.

In a data processing system,

• a first processing unit and associated hardware for executing programs under control of a first virtual operating system, said processing unit having a processor address bus,
• a second processing unit alien to said operating system, for executing programs under control of a second virtual operating system,
• means directly coupling the second processing unit to the first processing unit for the transfer of information therebetween,
• means including an application program running on the first processing unit for applying selected virtual addresses to said address bus,
• logic means responsive to one of said selected virtual addresses on said bus for uncoupling the first processing unit from its associated hardware, and
• means controlled by the first processing unit and the application program while the first processing unit is uncoupled for passing at least one of command and data information between the second unit and the first unit via said direct coupling means.

In a data processing system,

• a first processing unit and associated hardware for executing programs under control of a first virtual operating system,
• a second processing unit and associated hardware for executing programs under control of a second virtual operating system;
• each processing unit and its associated hardware being alien to the operating system of the other processing unit;
• means directly coupling the processing units to each other for the transfer of information therebetween;
• means associated with each processing unit and including a respective application program running on that processing unit uncoupling that processing unit from its associated hardware and coupling that processing unit to the direct coupling means;
• and
• means controlled by each processing unit and its respective application program while that unit is uncoupled, for exchanging information between that unit and the direct coupling means, whereby information may be exchanged directly between the processing units.

In a data processing system,

• a first processor unit and first associated hardware including main storage and I/O apparatus for processing information under control of a first virtual operating system,
• a second processor unit and second associated hardware including main storage and I/O apparatus for processing information under control of a second virtual operating system,
• each processor unit and its associated hardware being alien to the operating system of the other processor unit and hardware,
• means directly coupling said processor units, and
• means associated with the processor units and including respective application programs running on the processor units for uncoupling the processor units from their respective hardware and coupling the processor units to the direct coupling means for the transfer of commands and data between the processor units.

A method for uncoupling a processing unit from its associated hardware to permit an information transfer, in a manner indiscernible by its operating system, with apparatus alien to its operating system, comprising the steps of

• executing in said processing unit a selected data transfer instruction of a special application program,
• applying a predetermined virtual address on the address bus of the processing unit during the execution of said instruction.
• decoding said address,
• responsive to said decoding, blocking a processing unit address strobe signal from the associated hardware and applying it to the alien apparatus, thereby uncoupling the processing unit from its associated hardware and coupling the processing unit to the alien apparatus for data transfer.

A method for uncoupling a processing unit from its associated hardware to permit an information transfer, in a manner indiscernible by its operating system, with apparatus alien to its operating system, comprising the steps of

• executing in said processing unit a selected data transfer instruction of a special application program,
• placing a predetermined virtual address on the address bus of the processing unit during the execution of said instruction,
• decoding said address,
• uncoupling the processing unit from its associated hardware and coupling the processing unit to the alien apparatus in response to said decoding for execution of said data transfer instruction with said alien apparatus.

A method for coupling a first processor operating under the control of one operating system to one or more I/O units without software drivers in said operating system for said units comprising the steps of

• coupling the first processor for direct information transfer with a data processing system, including said I/O units and a second processor operated under the control of a second operating system,
• selectively uncoupling the second processor from the data processing system in a manner indiscernable to the second operating system by means including an application program executing on the second processor,
• selectively passing I/O commands and data from the first processor and its operating system to the second processor while uncoupled,
• converting said commands and data to commands executable by and data usable by the second processor and its operating system, and
• processing the converted commands and data in the data processing system.

A method of coupling one processor of one architecture operating under one operating system to another processor of a different architecture operating under a different operating system, said other processor normally coupled to hardware including a main storage and a plurality of I/O devices, comprising the steps of

• uncoupling the other processor from its hardware by means including an application program running on said other processor,
• operating the other processor as an I/O controller for the one processor by
• a. passing I/O commands and data from the one processor to the other processor in its uncoupled state,
• b. converting said commands and data to commands executable by and data useable by the other processor, and
• c. executing said converted commands in the other processor in its coupled state.

In a data processing system,

• a first processor having a bus structure and interacting with associated hardware for processing information under control of an operating system,
• a second processor alien to the operating system and having a bus structure and means for initiating interrupt requests on its processor bus for the first processor for the transfer of commands and data thereto,
• a direct coupling mechanism between the processors having a local storage for storing commands and data being transferred between the processors, a local bus structure adapted to couple the local storage to the processor bus structures of each processor for command and data transfers therebetween and logic means including a direct memory access controller (DMAC) for controlling the transfer of commands and data between said processor bus structures and the local storage via the local bus structure,
• logic means including the DMAC responsive to one of the interrupt requests from the second processor for applying an interrupt signal to the first processor,
• means including the first processor responsive to said signal for operating the first processor in isolation from its associated hardware and operating system for accessing an application program having a routine for servicing the interrupt request, and
• means operating the first processor in isolation from its associated hardware and operating system under the control of said application program for transferring commands and data between the processors via said direct coupling mechanism pursuant to said interrupt request.

In a data processing system,

• a processor and associated hardware for processing information under control of an operating system, said operating system having routines for handling interrupt requests from said processing system on plural priority levels,
• data handling apparatus alien to the operating system and including means for initiating additional interrupt requests to the processor on one of said priority levels for data transfer with the processor, said routines being unable to service the interrupt requests from said apparatus;
• an application program in the processing system including an additional interrupt handler routine to service the interrupt requests from said apparatus;
• means effective upon the initiation of an interrupt request from said apparatus for directing the processor to the additional interrupt handler routine without rejection by said operating system, said system thereafter effective to execute said additional interrupt handler routine on said processor;
• and
• means including said application program running on said processor unit selectively uncoupling the processor unit from said hardware and coupling the processor unit to said apparatus for data transfer without rejection by the operating system.

In a data processing system,

• a first processing unit and associated hardware for executing programs under control of a first virtual operating system,
• a second processing unit and associated hardware for executing programs under control of a second virtual operating system;
• each processing unit and its associated hardware being alien to the operating system of the other processing unit;
• means directly coupling the processing units to each other for the transfer of information therebetween;
• means in each processing unit for initiating interrupt requests to the other processing unit when a data transfer is required between the processors,
• means in each processing unit including an application program with interrupt handler routines to service interrupt requests from the other processing unit;
• means associated with each processing unit and including a respective application program running on that processing unit uncoupling that processing unit from its associated hardware and coupling that processing unit to the direct coupling means;
• and
• means controlled by each processing unit and its respective application program while that unit is uncoupled, for exchanging information between that unit and the direct coupling means, whereby information may be exchanged directly between the processing units.

In a data processing system,

• a first processor unit and first associated hardware for processing information under control of a first virtual operating system,
• a second processor unit and second associated hardware for processing information under control of a second virtual operating system,
• each processor unit and its associated hardware being alien to the operating system of the other processor unit and hardware,
• means directly coupling said processor units, and
• means associated with each processor unit and including a respective application program running on that processor unit for uncoupling that processor unit from its respective hardware and coupling that processor unit to the direct coupling means for the transfer of data between the processor units without using the services of and without rejection by either operating system.