> For the complete documentation index, see [llms.txt](https://nankai.gitbook.io/ucore-os-on-risc-v64/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nankai.gitbook.io/ucore-os-on-risc-v64/lab0.5.md).

# LAB0.5：最小可执行内核

相对于上百万行的现代操作系统(linux, windows), 几千行的ucore是一只"麻雀"。但这只麻雀依然是一只胖麻雀，我们一眼看不过来几千行的代码。所以，我们要再做简化，先用好刀法，片掉麻雀的血肉, 搞出一个"麻雀骨架"，看得通透，再像组装哪吒一样，把血肉安回去，变成一个活生生的麻雀。

lab0.5是lab1的预备，我们构建一个最小的可执行内核（”麻雀骨架“），它能够进行格式化的输出，然后进入死循环。


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