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linux-insides - A little bit about a linux kernel

  •    Python

A book-in-progress about the linux kernel and its insides. Questions/Suggestions: Feel free about any questions or suggestions by pinging me at twitter @0xAX, adding an issue or just drop me an email.

Xiaomi Mobile Phone Kernel OpenSource

  •    C

Linux kernel used in various Xiaomi Mobile devices.

raspberry-pi-os - Learning operating system development using Linux kernel and Raspberry Pi

  •    C

This repository contains a step-by-step guide that teaches how to create a simple operating system (OS) kernel from scratch. I call this OS Raspberry Pi OS or just RPi OS. The RPi OS source code is largely based on Linux kernel, but the OS has very limited functionality and supports only Raspberry PI 3. Each lesson is designed in such a way that it first explains how some kernel feature is implemented in the RPi OS, and then it tries to demonstrate how the same functionality works in the Linux kernel. Each lesson has a corresponding folder in the src directory, which contains a snapshot of the OS source code at the time when the lesson had just been completed. This allows the introduction of new concepts gracefully and helps readers to follow the evolution of the RPi OS. Understanding this guide doesn't require any specific OS development skills.




kmon - Linux Kernel Manager and Activity Monitor 🐧💻

  •    Rust

The kernel is the part of the operating system that facilitates interactions between hardware and software components. On most systems, it is loaded on startup after the bootloader and handles I/O requests as well as peripherals like keyboards, monitors, network adapters, and speakers. Typically, the kernel is responsible for memory management, process management, device management, system calls, and security. Applications use the system call mechanism for requesting a service from the operating system and most of the time, this request is passed to the kernel using a library provided by the operating system to invoke the related kernel function. While the kernel performs these low-level tasks, it's resident on a separate part of memory named protected kernel space which is not accessible by applications and other parts of the system. In contrast, applications like browsers, text editors, window managers or audio/video players use a different separate area of the memory, user space. This separation prevents user data and kernel data from interfering with each other and causing instability and slowness, as well as preventing malfunctioning application programs from crashing the entire operating system. There are different kernel designs due to the different ways of managing system calls and resources. For example, while monolithic kernels run all the operating system instructions in the same address space for speed, microkernels use different spaces for user and kernel services for modularity. Apart from those, there are hybrid kernels, nanokernels, and, exokernels. The hybrid kernel architecture is based on combining aspects of microkernel and monolithic kernels. The Linux kernel is the open-source, monolithic and, Unix-like operating system kernel that used in the Linux distributions, various embedded systems such as routers and as well as in the all Android-based systems. Linus Torvalds conceived and created the Linux kernel in 1991 and it's still being developed by thousands of developers today. It's a prominent example of free and open source software and it's used in other free software projects, notably the GNU operating system. Although the Linux-based operating systems dominate the most of computing, it still carries some of the design flaws which were quite a bit of debate in the early days of Linux. For example, it has the largest footprint and the most complexity over the other types of kernels. But it's a design feature that monolithic kernels inherent to have. These kind of design issues led developers to add new features and mechanisms to the Linux kernel which other kernels don't have.

keysniffer - :mag: Linux kernel mode debugfs keylogger

  •    C

A Linux kernel module to grab keys pressed in the keyboard, or a keylogger. keysniffer was initially written with the US keyboard (and conforming laptops) in mind. By default it shows human-readable strings for the keys pressed. Optionally, the keycode shift_mask pair can be printed in hex or decimal. You can lookup the keycodes in /usr/include/linux/input-event-codes.h.

pi64 - A 64-bit OS for the Raspberry Pi 3

  •    Go

pi64 is an experimental 64-bit OS for the Raspberry Pi 3. It is based on Debian Stretch and backed by a 4.11 Linux kernel. The latest images are always available in the releases section.


XRT - Xilinx Run Time for FPGA

  •    C

Xilinx Runtime (XRT) is implemented as as a combination of userspace and kernel driver components. XRT supports both PCIe based boards like U30, U50, U200, U250, U280, VCK190 and MPSoC based embedded platforms. XRT provides a standardized software interface to Xilinx FPGA. The key user APIs are defined in xrt.h header file.

linux-kernel-module-cheat - Run one command, get a QEMU or gem5 Buildroot BusyBox virtual machine built from source with several minimal Linux kernel 4

  •    C

Run one command, get a QEMU or gem5 Buildroot BusyBox virtual machine built from source with several minimal Linux kernel 4.16 module development example tutorials with GDB and KGDB step debugging and minimal educational hardware models. "Tested" in x86, ARM and MIPS guests, Ubuntu 18.04 host. This is the most native setup, and therefore the best one if you are on one of the supported Ubuntu: 16.04 or 18.04.

linux-0.11-lab - Docker/Qemu/Bochs Based Linux 0.11 Kernel Development Environment

  •    C

The old Linux kernel source version 0.11 and the integrated experiment environment. CS630 Qemu Lab is a related project, it is a friendly learning environment for the X86 assembly course: CS630.

linuxboot - The LinuxBoot project is working to enable Linux to replace your firmware on all platforms

  •    Perl

The LinuxBoot project allows you to replace your server's firmware with Linux. For the initrd, the Heads firmware or u-root systems work well. Both will build minimal runtimes that can fit into the few megabytes of space available.

krf - A kernelspace syscall interceptor and randomized faulter

  •    C

KRF is a Kernelspace Randomized Faulter. It currently supports the Linux and FreeBSD kernels.

python-nsenter - Enter kernel namespaces from Python

  •    Python

NSEnter is a Python package that enables you to enter Linux kernel namespaces — mount, IPC, net, PID, user and UTS — with a single, simple "setns" syscall. The command line interface is similar to the nsenter C program.When working with Docker containers, questions usually arise about how to connect into a running container without starting an explicit SSH daemon (which is considered a bad idea). One way is to use Linux Kernel namespaces, which Docker uses to restrict the view from within containers.

linux-samus - Linux 4.13 on Pixel 2015

  •    C

This repository contains packages for Debian and Arch Linux that installs the Linux kernel v4.10 with a config that is somewhat optimized for the Chromebook Pixel 2015.As of v4.9 there is no need to patch the kernel sources to get sound support.

devheart - Listen to Tux's heartbeat with this awesome Linux Kernel Module :heart:

  •    C

So, we could assume that Tux's heart are the CPUs. Now, depending on how stressed those CPUs are, Tux will feel healthy or not. See, dmesg for more information.

gentoo-kernel-guide - A better way to configure and manage kernels on Gentoo Linux

  •    

and various tips. No more blind copying of 4,000+ line .config files, no unnecessary code, no bullshit. This repo explains how I download, configure, and install kernels on my Gentoo Linux machines.

ebpf_exporter - Prometheus exporter for custom eBPF metrics

  •    Go

Prometheus exporter for custom eBPF metrics. Motivation of this exporter is to allow you to write eBPF code and export metrics that are not otherwise accessible from the Linux kernel.






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