apple-oss-distributions/xnu

Features

• Microkernel Architectures - Implements a hybrid microkernel design combining message passing with monolithic performance.
• Layered Architectures - Provides a layered driver architecture that separates low-level device drivers from high-level kernel services.
• Hardware Interfacing and Drivers - Provides a standardized programming interface for writing and managing kernel extensions that interface with hardware.
• Kernel Driver Implementation - Implements the development and deployment of kernel extensions that interface with hardware.
• Operating System Kernels - Provides the core operating system kernel designed to manage system hardware and process execution across architectures.
• Port-Based IPC - Implements a port-based asynchronous messaging system for communication between kernel tasks and userspace processes.
• Mandatory Access Control - Implements a mandatory access control interface to enforce system-wide security policies and restrict high-level permissions.
• Conditional Compilation - Uses build-time flags to include or exclude source code based on the target processor and hardware capabilities.
• Kernel Cache Parsers - Implements mechanisms for linking the core kernel and extensions into a single bootable cache image.
• Kernel Component Debugging - Supports connecting external hardware interfaces to inspect system state and manage crashes during development.
• Bootable Image Creation - Provides toolchains to compile kernel binaries into bootable images for development and production.
• Test Kernel Booting - Launches test environments using specific boot arguments and caches with a fallback mechanism to recover from failures.

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