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Inter Process Communications (IPC) through RPMsg Protocol

In asymmetric multiprocessor systems, the most common way for different cores to cooperate is to use a shared memory-based communication. There are many custom implementations, which means that the considered systems cannot be directly interconnected. Therefore, OpenAMP’s aim is to offer a standardization of this communication based on existing components (RPMsg, VirtIO).

OpenAMP’s implementation of RPMsg is through shared memory utlizing a ring buffer, with optional inter-core interrupts, using Virtio devices as the system level abstraction layer.

• RPMsg Protocol Layers
  • Physical Layer – Shared Memory
  • Media Access Layer - VirtIO
  • Transport Layer - RPMsg
• RPMsg Communication Flow
  • Main to Remote RPMsg Flow
  • Remote to Main RPMsg Flow
  • Vring queue and buffer allocation