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Playing around with userspace RISC-V assembly in multiarch containers with QEMU user mode emulation
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CodeRabbit
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Over the past few days, I've managed to implement a rudimentary RISC-V operating system kernel in C that does little more than print stuff to the serial console. Nevertheless, I did my best to structure the project to facilitate development in the mid- to long-term. The project template which I'll build upon going forward is released on GitHub as v0.0.1 of maRVelOS code-named "Meaty Skeleton", so if you're also interested in RISC-V and open hardware as a programmer, feel free to follow along!
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I would like to thank the authors of RISC-V from scratch and The Adventures of OS for their high-quality articles that go into great detail on how RISC-V works. Without their well-written articles, I wouldn't have known how to get started with kernel development on RISC-V. My initial project setup - the minimal C runtime crt0.s in assembly and the linker script riscv64-virt.lds - is based on the former, while my UART driver code is adapted from the latter and I intend to closely follow the latter going forward.
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I would like to thank the authors of RISC-V from scratch and The Adventures of OS for their high-quality articles that go into great detail on how RISC-V works. Without their well-written articles, I wouldn't have known how to get started with kernel development on RISC-V. My initial project setup - the minimal C runtime crt0.s in assembly and the linker script riscv64-virt.lds - is based on the former, while my UART driver code is adapted from the latter and I intend to closely follow the latter going forward.
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It's probably going to take me a long while before I manage to get anywhere near a borderline usable system, but hopefully I'll stick with it and learn more about the hardware from a programmer's perspective along the way. After all, the main takeaway of OSDev is the learning experience - for an out-of-the-box production grade general-purpose OS kernel, Linux is the answer ;-)
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Nutrient
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