Root Complex Integrated Endpoint Emulation for PCIe Feature Hiding
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Solution Overview
Problem
Root complex integrated endpoints (RCiEPs) within a system-on-chip (SoC) are discoverable as PCIe devices despite lacking a PCIe interface, which can expose unwanted features to the operating system and affect their operation.
Innovation Solution
Implementing emulation hardware to hide PCIe-specific registers and messages from the operating system, allowing RCiEPs to function without a physical PCIe interface, while maintaining compliance with PCIe standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RCiEPs are made discoverable as PCIe devices, then compatibility with PCIe endpoint controller IP is improved, but unwanted PCIe features are exposed to the operating system
Solution Approach 1:
The patent introduces an intermediary mechanism (emulation layer) between the RCiEP and the operating system. This emulation layer intercepts and filters PCIe-specific register accesses and messages, allowing the RCiEP to be discovered as a PCIe device while preventing unwanted PCIe features from being exposed to the OS. The intermediary selectively translates or blocks specific PCIe protocols and registers.
2Object-generated harmful factors
If emulation hardware is implemented to hide PCIe functionality, then PCIe feature exposure is reduced, but device complexity increases
Solution Approach 1:
The emulation hardware is segmented into distinct functional modules: a configuration space emulation module that handles register accesses, a message filtering module that intercepts PCIe messages, and a translation layer that maps PCIe operations to internal RCiEP operations. This segmentation allows each module to perform a specific function independently, reducing overall complexity while achieving the desired hiding of PCIe features.
Data Source
AI summary
Aspects of the embodiments are directed to systems and methods for emulating a PCIe root complex integrated endpoint. The systems and methods can include hardware logic implemented in a root complex system-on-chip and/or a connected device. The hardware can receive a request message to access one or more registers of a hardware device; determine that the request message includes a request to access one or more Peripheral Component Interconnect Express (PCIe)-specific registers; and respond to the request message without providing information associated with the one or more PCIe-specific registers.