$ show cirosantilli/linux-kernel-module-cheat
This repository is a comprehensive educational and research resource for low-level systems programming, focusing on Linux kernel modules, baremetal programming, CPU architectures (x86_64, ARM, AArch64), and emulation with QEMU and gem5. It contains hundreds of self-contained examples—from trivial 'hello world' kernel modules to advanced topics like IRQ handling, RCU stalls, inline assembly patterns, CPU pipeline hazards, and floating-point arithmetic. The repository is not a production application but rather a knowledge base with automated build and test infrastructure that systematically verifies correctness across multiple architectures and emulators. It also serves as a reference for gem5 simulation, including checkpoint/restore, performance counters, and benchmarking (e.g., Dhrystone, cache performance). While primarily a research/teaching tool, it includes a reusable Python automation framework (CLI generators, parallel test runners, path-based property configuration) that could be extracted for other projects. The repository is hybrid in nature: its core content is data/research (experimental, analytical), but it incorporates application-quality infrastructure.
The LLM identified 5 files worth highlighting for reuse:
Implements a path-based property inheritance system using a prefix tree. Each file can have associated build flags, test expectations (exit status, signals), architecture and emulator compatibility, and dependency lists. The tree supports wildcard defaults at directory levels. This decouples per-file configuration from generic build/test runners and is reusable in any project needing file-specific parameter management.
Provides the ShellHelpers class that abstracts subprocess calls while printing exact bash-equivalent commands (supports dry-run). Handles redirection, stdin, environment variables, and output capture. Used pervasively across build and test scripts. Clean, well-commented, and easily extractable for any project requiring reliable shell command orchestration.
A simple, self-contained ThreadPool class with configurable concurrency, proper exception handling (including from callback execution), and support for the 'with' statement. Used for parallel test execution and builds. The pattern is generic and can be reused in any Python project needing bounded parallelism.
Defines the CliFunction abstract class that allows a Python function to be called both programmatically and from the command line with automatic argument parsing, config file merging, and canonical CLI string generation. This reduces duplication between scripts and interactive use. The pattern is well-isolated and could be extracted as a lightweight CLI framework.
Provides preprocessor macros for assembly and C test examples: LKMC_PROLOGUE, LKMC_EPILOGUE, LKMC_ASSERT_EQ, LKMC_ASSERT_MEMCMP, etc. These enable self-contained, runnable code snippets that validate expected behavior. The pattern is reusable for any project needing inline unit tests in assembly or low-level C, particularly with multiple architectures.