Embedded Jump Table Microcode for Virtualized Processing
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Solution Overview
Problem
Conventional microcode and jump table initialization techniques are inefficient in virtualized computing environments where frequent switching between programs occurs, leading to errors and security vulnerabilities due to separate loading and potential mismatches.
Innovation Solution
Embedding the jump table within the microcode during compilation allows for simultaneous loading of both microcode and jump table in response to a single initialization request, enhancing processing efficiency and security by reducing external access risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microcode and jump table are loaded separately using conventional initialization techniques, then the processing unit can execute programs, but the initialization process becomes inefficient and error-prone when frequently switching between programs in virtualized computing environments
Solution Approach 1:
The patent combines the jump table with the microcode into a single unified structure. The jump table is embedded within the microcode memory space, allowing both to be loaded simultaneously in a single operation rather than requiring separate loading commands. This merging eliminates the time loss associated with sequential loading and reduces the overhead during program switching in virtualized environments.
Solution Approach 2:
The jump table is pre-positioned within the microcode structure during system setup or microcode loading. By preparing the combined structure in advance, the system eliminates the need for separate jump table loading operations when programs are switched, thereby improving productivity during frequent program transitions.
2Reliability
If microcode and jump table are loaded separately, then flexibility in loading is maintained, but mismatches between microcode and jump table can occur leading to errors and security vulnerabilities
Solution Approach 1:
By merging the jump table into the microcode structure, the patent ensures that both components are loaded together as a single unit. This eliminates the possibility of mismatches between microcode and jump table versions, as they are inherently synchronized when loaded together. The unified structure guarantees consistency and reliability while simplifying the loading process.
3Object-affected harmful factors
If separate loading of microcode and jump table is used, then external access and modification are possible, but security vulnerabilities and unauthorized modifications can occur
Solution Approach 1:
The patent embeds the jump table within the microcode memory structure, creating a unified protected region. This merging allows the system to apply single security protections to both components simultaneously, reducing security vulnerabilities by eliminating separate access points that could be exploited. The combined structure simplifies security management while enhancing protection against unauthorized modifications.
Data Source
AI summary
A processing unit employs microcode wherein the jump table associated with the microcode is embedded in the microcode itself. When the microcode is compiled based on a set of programmer instructions, the compiler prepares the jump table for the microcode and stores the jump table in the same file or other storage unit as the microcode. When the processing unit is initialized to execute a program, such as an operating system, the processing unit retrieves the microcode corresponding to the program from memory, stores the microcode in a cache or other memory module for execution, and automatically loads the embedded jump table from the microcode to a specified set of jump table registers, thereby preparing the processing unit to process received packets.