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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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# 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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## do you know some <strong>javascript</strong>?
# ok cool let's build an .highlight[operating system].
---
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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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.bigger[]
---
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# <strong>can</strong> .highlight[i] write an OS?
---
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.bigger[]
---
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# .highlight[should] <strong>i</strong> write an OS?
---
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.bigger[]
---
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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](os.phil-opp.com)
---
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# Rust?
---
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<img src="public/img/rust-logo.svg" alt="rust logo" width="600">
---
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> .highlight[Rust] is a systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.
#### https://www.rust-lang.org
---
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# ???lolwat
---
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# computers!
# .reallybig[🔥🔥🔥🔥🔥]
---
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.bigger[]
---
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---
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.bigger[]
---
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.bigger[]
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## .highlight[Rust] is a programming language that gives you the power of a language like C++ or C, but <strong>makes the decision to actively try to keep you from failing</strong> by having a compiler that enforces safety.
---
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# <strong>tl;dr</strong>
# .highlight[Rust] wants you to succeed. It's designed with empowering you in mind.
---
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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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.bigger[]
---
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# Three definitions
[Modern Operating Systems](https://www.amazon.com/Modern-Operating-Systems-Andrew-Tanenbaum/dp/013359162X):
> It is hard to pin down what an operating system is other than saying it is
> the software that runs in kernel mode—and even that is not always true. Part
> of the problem is that operating systems perform two basically unrelated
> functions: providing application programmers a clean abstract set of
> resources instead of the messy hardware ones and managing these hardware
> resources.
---
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.bigger[]
---
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# Three definitions
[Three Easy Pieces](http://pages.cs.wisc.edu/~remzi/OSTEP/):
1. Virtualization
2. Concurrency
3. Persistence
---
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# Three definitions
[Exterminate All Operating System Abstractions](https://people.eecs.berkeley.edu/~brewer/cs262b/hotos-exokernel.pdf):
> "software that securely multiplexes and abstracts physical resources"
But, uh...
> We believe that this denition specifically its view of the OS as an
> abstractor of hardware, is crippling and wrong.
---
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.bigger[]]
---
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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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# common abstractions
these are some common abstractions provided by an operating system and/or kernel:
- address spaces
- memory protection
- processes
- files
- input/output devices
---
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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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---
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> Remember that all models are wrong; the practical
> question is .highlight[how wrong do they have to be to not be useful].
### George E. P. Box
##### Box, G. E. P., and Draper, N. R., (1987), Empirical Model Building and Response Surfaces, John Wiley & Sons, New York, NY. p74.
---
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# an operating system's job is to .highlight[lie]
---
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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]?
- this is also a bit fuzzy
- "the software that runs in kernel mode", "even that is not always true"
- the kernel is the core of the operating system.
##### http://intermezzos.github.io/book/what-kind-is-there.html
---
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# Kinds of kernels
- monolithic kernel
--
- microkernel
--
- exokernel
--
- unikernel
--
- unicorn
--
- exoskeleton
--
- microaggression
--
- mononucleosis
---
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.bigger[]
---
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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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# wat is .highlight[operating system]?
---
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# if you wish to computer from scratch you must first .highlight[invent the universe]
---
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# if you wish to computer from scratch you must first .highlight[invent an operating system]
---
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.bigger[]
---
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# you don't <strong>have to</strong> invent the universe
--
# .highlight[but if you want to... you can]
---
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# and you .highlight[should]!
---
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.bigger[]
---
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# make the computer do a thing! .highlight[with basically nothing else!]
---
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---
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# get .highlight[low]
--
# -level programming!
---
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## *sorry sorry i'm trying to delete it*
---
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# OK! let's try this out
---
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# <strong>prerequisites</strong>
- ## up and running
- ## linux dependencies
- ## utilities (optional)
---
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# <strong>up and running</strong>
[https://twitter.com/_gsmith/status/585530735076966400](https://twitter.com/_gsmith/status/585530735076966400)
---
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# <strong>up and running</strong>
# how do you .highlight[even]?!
---
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# <strong>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`: emulator/virtualizer
---
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[https://twitter.com/ag_dubs/status/791725824667815936](https://twitter.com/ag_dubs/status/791725824667815936)
---
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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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# what comes .highlight[next]?
---
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# jumping into <strong>longmode</strong>
# 32 -> .highlight[64]
---
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---
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# .highlight[DEMO TIME!]
## VGA driver in Rust
---
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.bigger[]
---
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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
---
class: center, middle
[https://twitter.com/ag_dubs/status/780041177949167616](https://twitter.com/ag_dubs/status/780041177949167616)
---
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[https://twitter.com/_lizbaillie/status/784222008863133696](https://twitter.com/_lizbaillie/status/784222008863133696)
---
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[https://twitter.com/ScribblingOn/status/777092462095405056](https://twitter.com/ScribblingOn/status/777092462095405056)
---
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.bigger[]
---
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[https://twitter.com/bcjbcjbcj/status/791673835410034692](https://twitter.com/bcjbcjbcj/status/791673835410034692)
---
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[https://twitter.com/josephcorcoran/status/791739889834262528](https://twitter.com/josephcorcoran/status/791739889834262528)
---
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.bigger[]
---
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.bigger[]
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# .highlight[contribute] to .title[intermezz]<strong>OS</strong>!
---
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## the <strong>kernel</strong>
- # 16 contributors
- # 310 commits
- # 659 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>
- # 53 contributors
- # 278 commits
- # 238 github stars
---
class: center, middle
# .highlight[contribute] to .title[intermezz]<strong>OS</strong>!
--
## .subtitle[whoever you are! we think you're great]
---
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.bigger[]
---
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# "<strong>Failure to comply</strong> will make you look .highlight[silly]."
--
</br>
# and that's a good thing.
---
class: left, middle
> As the above hasty survey must have made evident, there
> are innumerable unsolved problems in the subject, and much
> work needs to be done. If any student is led into a serious
> study of mathematical logic by this little book, it will
> have served the chief purpose for which it has been written.
### Bertrand Russell
##### Russell, Bertrand. "Introduction to Mathematical Philosophy". George Allen & Unwin, Ltd., London. May 1919. 206.
---
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# <strong>I CAN OPERATING SYSTEM</strong> .highlight[AND SO CAN YOU]
---
class: middle, left
# <strong>thanks!</strong>
<br/>
- ### ashley williams, [@ag_dubs](https://twitter.com/ag_dubs)
- ### [intermezzos.github.io/hellocon2017](http://intermezzos.github.io/hellocon2017)
- ### [@intermezzOSrs](https://twitter.com/intermezzosrs), [intermezzos.github.io](https://intermezzos.github.io/)
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