Boot Controller Cache Configuration for Parallel Initialization
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Solution Overview
Problem
Current boot processes in computer systems are slow due to the lack of visibility of last-level cache memory during the boot stage, limiting the ability to parallelize boot steps and resulting in longer boot times, especially in multicore processor systems where resources are not efficiently utilized.
Innovation Solution
The implementation of a boot controller that configures a cache as memory for hardware initialization code before execution, allowing for parallel processing and reducing boot time by utilizing a larger pre-initialized cache memory, such as L4 cache, which is accessible by multiple cores, thereby enabling a multicore environment for faster boot processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional boot process is used with limited memory visibility, then system stability is maintained, but boot time is extended due to inability to parallelize boot steps
Solution Approach 1:
The patent configures the cache as memory before executing hardware initialization code, making memory resources available in advance during the boot stage. This preliminary configuration enables the boot process to utilize cache memory without waiting for DRAM initialization, thereby reducing boot time while maintaining system stability.
2Productivity
If cache is configured as memory before hardware initialization code execution, then boot time is reduced through parallel processing, but device complexity increases
Solution Approach 1:
The patent divides the boot process into distinct stages with the boot controller managing cache configuration separately from the hardware initialization code execution. This segmentation allows the boot controller to prepare cache memory independently, enabling parallel processing without overwhelming system complexity.
Solution Approach 2:
The boot controller acts as an intermediary component that bridges the gap between the processor core and the cache memory during the boot stage. It manages the cache-as-memory configuration and facilitates smooth transition to the hardware initialization code, reducing the complexity burden on the overall system.
3Adaptability or versatility
If last-level cache is made visible during boot stage, then resource utilization is optimized for parallel execution, but memory management complexity increases
Solution Approach 1:
The patent applies cache-as-memory configuration locally during the boot stage rather than globally across all operating modes. The boot controller enables cache visibility specifically for hardware initialization code execution, while maintaining standard memory management during normal operation. This localized approach optimizes resource utilization without permanently complicating memory management.
Data Source
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AI summary
Systems, methods, and apparatuses relating to circuitry to implement a multiprocessor boot flow for a faster boot process are described. In one embodiment, a system includes a hardware processor comprising a processor core, a cache coupled to the hardware processor, storage for hardware initialization code, and a controller circuit to initialize a portion of the cache as memory for usage by the hardware initialization code before beginning execution of the hardware initialization code after a power on of the system.