Managarm: Design of a pragmatic fully-asynchronous microkernel

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Managarm is a microkernel-based OS that uses a capability-based design to manage hardware and a fully asynchronous syscall model where operations (memory management, IPC) never block but instead return completion notifications. It delivers those completions to user space via a lock-free ring buffer, implements a POSIX subsystem entirely in user space to run UNIX apps (for example a Wayland desktop), and uses kernel-side acceleration strategies to make that user-space subsystem efficient.

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