# lab0.5: 比麻雀更小的麻雀(最小可执行内核)

*放了一把火, 烧得只剩个架架*

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。这就是我们的ucore step-by-step tutorial的思路。

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。

下面我们就开始解剖麻雀。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://1790865014.gitbook.io/ucore-step-by-step/intro-1.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.