In circuit emulator(ICE) that flags events occuring in system management mode(SMM)
US5392420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 30, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/86
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A micro processor emulator in which an SMM flag is set whenever a processor being emulated enters system management mode (SMM) mode, a diminished power mode, and is reset when the processor leaves SMM mode. Events, such as branch instructions, that are recorded in a trace memory while the processor is in SMM mode (when the SMM flag is set) are recorded as a trace frame comprised of a trace word and an associated in system management mode (IN.sub.-- SMM) trace bit. When a user evokes interrogation mode of the emulator, the IN.sub.-- SMM trace bit is used to calculate correct physical addresses for disassembly of the recorded trace information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.