Browse Prior Art Database

Method And Apparatus To Protect And Freeze Unlicensed Processors On Server Machines Equipped With Extra Processor Capacity

IP.com Disclosure Number: IPCOM000010503D
Original Publication Date: 2002-Dec-09
Included in the Prior Art Database: 2002-Dec-09
Document File: 1 page(s) / 41K

Publishing Venue

IBM

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 77% of the total text.

Page 1 of 1

  Method And Apparatus To Protect And Freeze Unlicensed Processors On Server Machines Equipped With Extra Processor Capacity

Disclosed is a method to be employed by the system firmware on server machines to protect and freeze the unlicensed processors for which the machine owners have not paid to use them.

Modern server machines may be manufactured and shipped to customers with extra processor capacity than what the customers pay for. These extra processor can be used by the system firmware to replace bad processors in the machines without physically removing the hardware from the system. They can also be licensed and used when the customers require additional processing power and have paid for them. During boot time, system firmware must make sure that the master processor is a licensed processor. The slave processors will wait to be dispatched. The IBM PowerPC *POWER4 processor has the Scan Communication (SCOMM) facility to put itself into the "instruction stop" mode through sequence of accesses to SCOMM registers. Using this capability, the master processor identified unlicensed slave processors and dispatch them to execute the firmware code which is set up to put the processor into the "instruction stop" mode. When the slave processors are in the "instruction stop" mode, the only way to get out of that mode is by scanning the processors from the system's service processor upon an activation request to license extra processor(s).

After all unlicensed processors...