Microinstruction Table Base Address Switching for Multi-ISA Emulation
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Solution Overview
Problem
Existing network devices face inefficiencies in emulating multiple instruction sets, which hinders their ability to perform tasks such as firewall rule searches and packet processing efficiently.
Innovation Solution
A device with a processor configured to execute microinstructions, store a base address of a microinstruction table, and switch between different sets of microinstructions to emulate target instructions, allowing for efficient emulation of multiple instruction sets with minimal processing cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device emulates multiple instruction sets using traditional methods, then it can perform diverse network tasks, but the processing overhead increases and efficiency decreases
Solution Approach 1:
The patent segments the emulation process by dividing microinstructions into multiple sets, where each set corresponds to a specific instruction set architecture. The device selectively activates only the relevant microinstruction set needed for the current task, rather than maintaining all instruction sets simultaneously active. This segmentation reduces the processing overhead by eliminating unnecessary instruction set emulation while maintaining the ability to emulate multiple instruction sets when needed.
Solution Approach 2:
The patent implements dynamic switching between different microinstruction sets based on the emulation requirements. The device can dynamically load and activate the appropriate microinstruction set in response to different instruction set emulation demands, rather than statically maintaining all instruction sets. This dynamic approach optimizes processing efficiency by activating only the necessary instruction set for each specific task.
2Speed
If a device maintains multiple complete instruction set emulations ready, then switching between instruction sets is fast, but the device complexity and resource consumption increase
Solution Approach 1:
The patent extracts only the essential components needed for instruction set emulation by implementing a unified microinstruction format that can represent multiple instruction set operations. Rather than maintaining complete separate emulation environments for each instruction set, the device extracts and implements a core set of microinstructions that can be selectively configured to emulate different instruction sets, reducing device complexity while maintaining switching capability.
Solution Approach 2:
The patent creates a universal microinstruction set architecture where a single microinstruction format can serve multiple instruction set emulation purposes. The microinstructions are designed with flexible fields that can be interpreted differently based on the active instruction set context, allowing one microinstruction set to perform the functions of multiple dedicated instruction set emulations. This multi-functionality reduces device complexity while enabling fast switching between instruction sets.
Data Source
AI summary
A device may emulate target instructions by executing a first set of microinstructions, and may store a base address of a table that includes a microinstruction provided in a second set of microinstructions for emulating the target instructions. The device may also locate the microinstruction based on the stored base address, and emulate one of the target instructions by executing the microinstruction.