Mechanism by which devices on unforeseen platform variants may be supported without re-release of core platform kernel software

• US 6,618,767 B1
• Filed: 11/17/1998
• Issued: 09/09/2003
• Est. Priority Date: 11/17/1998
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Traversat, Bernard, Slaughter, Gregory, Yeh, Yuh-Yen, Hudson, Donald Jr., Saulpaugh, Thomas
• Primary Examiner(s): Follansbee, John
• Assistant Examiner(s): Cao, Diem K.
• Application Number:
  US09/193,199
• Time in Patent Office: 1,757 Days
• Field of Search: 709/310-328, 717/1
• US Class Current: 719/321
• CPC Class Codes: G06F 9/4411 Configuring for operating with peripheral devices; Loading of device drivers
• CPC Class Codes: G06F 9/45537 Provision of facilities of other operating environments, e.g. WINE I/O emulation G06F13/105

Abstract

The present invention provides a means to support new and modified platforms without the need to modify the system software kernel. The invention uses an approach referred to as Platform Service Agents (PSAs). The PSA works with the bus manager of the system software for that platform variant and modifies the system resources as needed. The PSA isolates specifics of the platform, so that the bus manager need not be modified. Because the PSAs themselves are outside of the kernel, are downloadable, and easily created for platform variants, new platforms can be supported without modification or re-release of the system software kernel.

Claims

1. A computer implemented method for implementing an interface to a device driver comprising:

generating a request from said device driver associated with a first platform;

providing said request to a bus manager interface, said bus manager interface written for a second platform and where said bus manager interface cannot handle said request; and

modifying said bus manager interface using a platform service agent (PSA) so that said bus manager interface can handle said request.

2. The method of claim 1 wherein said first platform is a variant of said second platform.

3. The method of claim 1 wherein said bus manager is part of a system software kernel.

4. The method of claim 3 wherein said PSA is not part of said system software kernel.

5. The method of claim 1 wherein said device driver, said bus manager, and said PSA are implemented in the Java programming language.

6. The method of claim 1 wherein said request is a request for an array of memory descriptors and said PSA modifies said array of memory descriptors, said device driver then calling a method to allocate memory associated with one of said modified array of memory descriptors.

19. A computer implemented method as recited in claim 1, wherein said computer implemented method further comprises:

loading said device driver; and

determining an initial set of memory descriptors.

20. A computer implemented method as recited in claim 1, wherein said computer implemented method further comprises:

determining whether there is a PSA associated with said device driver.

7. An apparatus for implementing an interface to a device driver comprising:

a device driver associated with a first platform;

a bus manager interface called by said device driver, said bus manager interface written for a second platform and where said bus manager interface cannot handle a request generated by said device driver; and

a platform service agent (PSA) for modifying said bus manager interface so that said bus manager interface can handle said request.

8. The apparatus of claim 7 wherein said first platform is a variant of said second platform.

9. The apparatus of claim 7 wherein said bus manager is part of a system software kernel.

10. The apparatus of claim 9 wherein said PSA is not part of said system software kernel.

11. The apparatus of claim 7 wherein said device driver, said bus manager, and said PSA are implemented in the Java programming language.

12. The apparatus of claim 7 wherein said request is a request for an array of memory descriptors and said PSA modifies said array of memory descriptors, said device driver then calling a method to allocate memory associated with one of said modified array of memory descriptors.

13. A computer readable medium including computer program code for implementing an interface to a device driver, said computer readable medium comprising:

computer program code for generating a request from said device driver associated with a first platform;

computer program code for providing said request to a bus manager interface, said bus manager interface written for a second platform and where said bus manager interface cannot handle said request; and

computer program code for modifying said bus manager interface using a platform service agent (PSA) so that said bus manager interface can handle said request.

14. A computer readable medium as recited in claim 13, wherein said first platform is a variant of said second platform.

15. A computer readable medium as recited in claim 14, wherein said bus manager is part of a system software kernel.

16. A computer readable medium as recited in claim 15, wherein said PSA is not part of said system software kernel.

17. A computer readable medium as recited in claim 16, wherein said device driver, said bus manager, and said PSA are implemented in the Java programming language.

18. A computer readable medium as recited in claim 17, wherein said request is a request for an array of memory descriptors and said PSA modifies said array of memory descriptors, said device driver then calling a method to allocate memory associated with one of said modified array of memory descriptors.