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Add an introduction for the VGA buffer post

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Philipp Oppermann
2015-10-14 10:46:55 +02:00
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_drafts/printing-to-screen.md
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@@ -3,7 +3,12 @@ layout: post
title: 'Printing to Screen'
category: 'rust-os'
---
TODO Introduction
In the [previous post] we switched from assembly to [Rust], a much safer and more expressive language. But we still need unsafe features like [raw pointers] every time we want to print something to the screen. In this post we will create a Rust module that provides a safe and easy-to-use interface to the VGA text buffer. It will support Rust's [formatting macros], too.
[previous post]: {{ site.url }}{{ page.previous.url }}
[Rust]: https://www.rust-lang.org/
[raw pointers]: https://doc.rust-lang.org/book/raw-pointers.html
[formatting macros]: https://doc.rust-lang.org/std/fmt/#related-macros
## The VGA Text Buffer
The text buffer starts at physical address `0xb8000` and contains the characters displayed on screen. It has 80 rows and 25 columns. Each screen character has the following format: