Posts about programming, DevOps, Linux server management, and more.
In earlier blog posts, I discussed QEMU’s debugcon device and presented a minimal driver for it written in x86 assembly. In this blog post, we go a little higher and write a driver for Linux in C. The driver should provide a /dev/debugcon device so that processes can open the Read more…
In this blog post, I’m going to show you briefly how you can compile an out-of-tree Linux kernel module in Nix. I use regular Nix for that and no Nix flakes. However, with flakes, the approach is similar. Background Knowledge An out-of-tree Linux kernel module is a standalone piece of Read more…
In this blog post, I explain how to test a single NixOS module in CI. By single NixOS module, I mean a module that provides some options and configurations, but itself is not a valid NixOS configuration. The use case is to have a common module (in a git repository) Read more…
A kernel should be relocatable by bootloaders as this is the only guarantee that it doesn’t interfere with addresses already in use by the firmware. This is especially true for the legacy boot flow on x86, i.e., without UEFI. TL;DR Introduction There are multiple ways to make a kernel relocatable. Read more…
This article explains how the GNU linker (GNU ld) can save disk space for symbols in the .bss section. TL;DR: If a section is of type SHT_NOBITS and if it is the last section in a LOAD segment, GNU ld uses this optimization. When you build software with a compiled Read more…
Update: I found another variant. I appended it to the end of the article. Original post: Some rudimentary ELF loaders require that p_memsz equals p_filesz for each LOAD segment in order to simplify the loading of the file. For example, the microkernels NOVA and Hedron have this restriction to bootstrap Read more…