Add posts to rust-os category

_posts/2015-08-18-multiboot-kernel.md

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 layout: post
 title: 'A minimal x86 kernel in small steps'
+category: 'rust-os'
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 This post explains how to create a minimal x86 operating system kernel. In fact, it will just boot and print `OK` to the screen. The following blog posts we will extend it using the [Rust] programming language.
 

_posts/2015-08-25-entering-longmode.md

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 layout: post
 title: 'Entering Long Mode in small steps'
+category: 'rust-os'
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 In the [previous post] we created a minimal multiboot kernel. It just prints `OK` and hangs. Let's extend it! The goal is to call 64-bit [Rust] code. But the CPU is currently in [Protected Mode] and allows only 32-bit instructions and up to 4GiB memory. So we need to setup _Paging_ and switch to the 64-bit [Long Mode] first.