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<DOCTYPE html>
<html>
<head>
<title>the ag_deck</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<link href="public/skeleton.css" type="text/css" rel="stylesheet">
<link href="public/custom.css" type="text/css" rel="stylesheet">
</head>
<body>
<textarea id="source">
class: middle, center
# .title[intermezz]<strong>OS</strong>
## .subtitle[a teaching operating system]
---
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# hi, i'm <strong>@ag_dubs</strong>
---
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---
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---
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---
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---
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---
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# i really <strong>love</strong> .highlight[programming languages]
---
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# i really like <strong>thinking about thinking</strong>
--
# especially the type of thinking that happens .highlight[when people write code]
---
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# .title[intermezz]<strong>OS</strong>
## .subtitle[a teaching operating system]
---
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### intermezzOS is...
## a teaching operating system, specifically focused on <strong>introducing systems programming concepts</strong> to experienced developers from other areas of programming.
---
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---
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# "do you wanna stay in tonight, put on comfy pants, and <strong>do this neat .highlight[kernel tutorial]?<strong>"
<br/>
# circle one: yes no
---
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# HECK .highlight[YES] I DO
---
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# LET'S GET <strong>CLOSE TO THE .highlight[METAL]</strong>
---
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# but wait...
---
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# <strong>can</strong> .highlight[i] write an OS?
---
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# .highlight[should] <strong>i</strong> write an OS?
---
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##### http://wiki.osdev.org/Required_Knowledge
--
.no[]
---
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# "1. Basic Computer Science: You need to be <strong>intimately familiar with</strong> .highlight[hexadecimal] and binary notation..."
##### http://wiki.osdev.org/Required_Knowledge
--
.no[]
---
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# "5. Programming experience: .highlight[Learning] about programming with an OS project is <strong>considered a bad idea.</strong>"
--
.no[]
---
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# "<strong>Failure to comply</strong> will make you look .highlight[silly]."
--
.no[]
---
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# Phillip Opperman
# <strong>Writing an OS in Rust</strong>
# [os.phil-opp.com](https://os.phil-opp.com/)
---
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# <strong>I CAN OPERATING SYSTEM</strong> .highlight[AND SO CAN YOU]
---
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---
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# wat is .highlight[operating system]?
---
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# An operating system is a <strong>program that provides a platform for other programs</strong>. It provides two things to these programs: .highlight[abstractions] and .highlight[isolation].
##### http://intermezzos.github.io/book/what.html
---
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# abstractions
---
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---
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---
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---
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### We now have a pattern:
- ## I have `A`.
- ## `A` is written explicitly for `X`...
- ## ... but I want to support `X` and `Y`,
- ## <strong>so I put .highlight[abstraction] `B` in the middle.</strong>
---
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# isolation
---
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### <strong>intermezzo</strong> .subtitle[ |ˌin(t)ərˈmetsō|], noun
## a light dramatic, musical, or other performance inserted between the acts of a play.
---
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# wat is .highlight[kernel]?
## the core component of an OS.
##### http://intermezzos.github.io/book/what-kind-is-there.html
---
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# what kind of OS?
--
<br/>
# it .highlight[doesn't matter]
---
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# "[W]e could waste a lot of time trying to design our perfect OS. <strong>And then never actually build it.</strong> Remember, .highlight[the goal here is to learn], not to make the best OS that ever existed."
##### http://intermezzos.github.io/book/what-kind-are-we-making.html
---
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# OK! let's try this out
---
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# <strong>prerequisites</strong>
- ## virtualization
- ## linux dependencies
- ## utilities (optional)
---
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# <strong>virtualization</strong>
.subtitle[(if you are on OSX, ChromeOS, Windows*, etc)]
- ## [Vagrant](https://www.vagrantup.com/): development environment manager
- ## [VirtualBox](https://www.virtualbox.org/): virtualizer
- ## [XQuartz](http://www.xquartz.org/): X11 Graphics
<br/>
<br/>
*new windows has Ubuntu! so you can also use that
---
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# <strong>linux dependencies</strong>
- ### `nasm`: assembler (assembly -> binary)
- ### `ld`: linker (makes binary out of other files)
- ### `grub`: creates the bootable iso
- ### `xorriso`: req'd by grub, filesystem manipulator
- ### `QEMU`: fake-computer emulator
---
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# <strong>utilities</strong>
#### .subtitle[you don't need these, but they are nice for viewing generated code.]
- ## `hexdump`: allows you to view generated binary
- ## `objdump`: a nicer viewer for `.o` files
---
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# what happens when you turn on your computer
---
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- ## 1. the <strong>hardware</strong> loads .highlight[BIOS]
- ## .subtitle[<strong>B</strong>asic <strong>I</strong>nput <strong>O</strong>utput <strong>S</strong>ervice]
- ## 2. <strong>BIOS</strong> loads .highlight[GRUB]
- ## .subtitle[<strong>G</strong>rand <strong>U</strong>nified <strong>B</strong>ootloader]
- ## 3. <strong>GRUB</strong> loads our .highlight[kernel]
---
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# <strong>linking</strong>
- ### how the sections in the input files should be mapped into the output file
- ### control the memory layout of the output file
--
## .highlight[make sure the header info is at the top]
---
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# .highlight[DEMO TIME!]
## hello world in <strong>assembly</strong>
---
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# whoa wait what just happened
---
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- ### the BIOS loads the bootloader (GRUB) from the virtual hard drive (the ISO)
- ### the bootloader reads the kernel executable and finds the Multiboot header
- ### it copies the `.boot` and `.text` sections to memory (to addresses `0x100000` and `0x100020`)
- ### it jumps to the entry point (`0x100020`, you can obtain it through `objdump -f`)
- ### our kernel prints the message and stops the CPU
##### http://os.phil-opp.com/multiboot-kernel.html
---
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# what comes .highlight[next]?
---
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# jumping into <strong>longmode</strong>
# 32 -> .highlight[64]
--
### this takes way too long to show right now
---
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# (it's not <strong>Hard</strong>, so much as .highlight[Tedious])
---
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# .highlight[DEMO TIME!]
## hello world in <strong>rust</strong>
---
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# whoa wait what just happened
---
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- ### fill an array with bytes for the foreground/background color we want
- ### write the ascii for the letters we want in every other item in the array
- ### assign the array to a pointer, printing it to the screen
---
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# i was told this code was .highlight[too complicated]
--
<br/>
# whatever. it was <strong>so fun to write</strong>.
---
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---
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# .highlight[teaching] is nature's way of letting you know <strong>how</strong> .highlight[sloppy] <strong>your thinking is</strong>
---
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## go write some <strong>irresponsible code</strong>
--
# and then .highlight[teach someone else] to do the same
---
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# .highlight[contribute] to .title[intermezz]<strong>OS</strong>!
--
## .subtitle[we're only 9 months old!]
---
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## the <strong>kernel</strong>
- # 12 contributors
- # 233 commits
- # 444 github stars
---
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# you .highlight[don't] have to <strong>contribute code</strong> to <strong>contribute</strong>
---
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## the <strong>book</strong>
- # 47 contributors
- # 260 commits
- # 184 github stars
---
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# .highlight[contribute] to .title[intermezz]<strong>OS</strong>!
--
## .subtitle[whoever you are! we think you're great]
---
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# "<strong>Failure to comply</strong> will make you look .highlight[silly]."
--
</br>
# and that's a good thing.
---
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# <strong>I CAN OPERATING SYSTEM</strong> .highlight[AND SO CAN YOU]
---
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# <strong>thanks!</strong>
<br/>
- ### ashley williams, [@ag_dubs](https://twitter.com/ag_dubs)
- ### [intermezzos.github.io/rustfest2016](http://intermezzos.github.io/rustfest2016)
- ### [@intermezzOSrs](https://twitter.com/intermezzosrs), [intermezzos.github.io](https://intermezzos.github.io/)
</textarea>
<script src="public/remark.js" type="text/javascript">
</script>
<script type="text/javascript">
var slideshow = remark.create();
</script>
</body>
</html>