Validity of address ranges used in semi-synchronous memory copy operations

US7506132B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Ravi Kumar Arimilli · Austin, US
• Rama K. Govindaraju · Poughkeepsie, US
• Peter Hochschild · New York, US
• Bruce Mealey · Austin, US
• Satya P. Sharma · Austin, US
• Balaram Sinharoy · Poughkeepsie, US

Key dates

• Filing date: Dec 22, 2005
• Grant date: Mar 17, 2009
• Expiry date: Sep 16, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F12/0897
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A system, method, and a computer readable for protecting content of a memory page are disclosed. The method includes determining a start of a semi-synchronous memory copy operation. A range of addresses is determined where the semi-synchronous memory copy operation is being performed. An issued instruction that removes a page table entry is detected. The method further includes determining whether the issued instruction is destined to remove a page table entry associated with at least one address in the range of addresses. In response to the issued instruction being destined to remove the page table entry, the execution of the issued instruction is stalled until the semi-synchronous memory copy operation is completed.