DMA and graphics interface emulation
US7870307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2007 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | Sep 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/4881
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An emulator schedules emulation threads for DMA emulation and other emulation functions in a time-multiplexed manner. Emulation threads are selected for execution according to a load balancing scheme. Non-DMA emulation threads are executed until their execution time period expires or they stall. DMA emulation thread execution is allowed to execute indefinitely until the DMA emulation thread stalls. The DMA emulation thread prefetches additional adjacent data in response to target computer system DMA requests. Upon receiving a target computer system DMA request, the DMA emulation thread first checks to the prefetched data to see if this data matches the request. If so, the request is fulfilled using the prefetched data. If the prefetched data does not match the target computer system DMA request, the DMA emulation thread fetches and stores the requested data and additional adjacent data for potential future use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.