Address Translation Cache Verification via Minimal Structures
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Solution Overview
Problem
Current methods for verifying the operation of address translation caches in processors are inefficient and time-consuming, especially when dealing with extensive tests and context changes, and often require loading a full-fledged Operating System, which can be costly and resource-intensive.
Innovation Solution
A method involving the generation of multiple address translation structures, where a first structure is used to determine a second structure, allowing for rapid verification of address translation caches by adding cache lines and performing memory access operations, thereby accelerating the verification process without the need for a full OS load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full-fledged Operating System is loaded to verify address translation cache operation, then verification completeness is improved, but resource consumption and time cost increase significantly
Solution Approach 1:
The patent extracts the essential verification functionality from the full Operating System environment. Instead of loading a complete OS, the invention creates a minimal test environment that contains only the address translation cache and necessary test structures, separating the verification task from the overhead of a full OS implementation.
Solution Approach 2:
The patent performs preliminary setup by pre-configuring the address translation cache with test data and pre-establishing the verification infrastructure before actual testing begins. This includes pre-allocating memory structures and pre-configuring the cache with test entries, so that the actual verification process can proceed without the time-consuming setup that would be required in a full OS environment.
2Reliability
If extensive tests are performed on address translation cache, then bug detection capability is improved, but verification time increases
Solution Approach 1:
The patent applies partial action by implementing a targeted testing approach that focuses specifically on address translation cache functionality. Rather than performing exhaustive tests on all OS components, the invention concentrates test resources on the cache structure, its entry formats, and translation operations, achieving sufficient verification without the overhead of complete system testing.
Solution Approach 2:
The patent segments the verification process into distinct, manageable components: cache structure validation, entry format verification, translation operation testing, and context switching verification. This segmentation allows each aspect to be tested independently and efficiently, improving overall verification productivity while maintaining comprehensive bug detection capability.
3Reliability
If context switching is implemented during verification, then cache operation reliability is improved, but test complexity increases
Solution Approach 1:
The patent uses copying to manage context switching verification. Instead of creating entirely new test structures for each context, the invention copies and adapts existing test structures to represent different contexts. This allows multiple context scenarios to be verified using replicated test data, improving reliability of cache operation verification under context switching while avoiding the complexity of designing entirely new test frameworks for each context.
Data Source
AI summary
A method, apparatus and product for utilizing address translation structures for testing address translation cache. The method comprises: obtaining a first address translation structure that comprises multiple levels, including a first top level which connects a sub-structure of the first address translation structure using pointers thereto; determining, based on the first address translation structure, a second address translation structure, wherein the second address translation structure comprises a second top level that is determined based on the first top level, wherein the second top level connects the sub-structure of the first address translation structure; executing a test so as to verify operation of an address translation cache of a target processor at least by: adding a plurality of cache lines to the address translation cache, wherein said adding is based on the address translation structures; and verifying the operation of the address translation cache using one or more memory access operations.