https://homeostasis.scs.carleton.ca/wiki/index.php?action=history&feed=atom&title=Operating_Systems_2019W_Lecture_1 2026-04-05T17:00:48Z Revision history for this page on the wiki MediaWiki 1.42.1 https://homeostasis.scs.carleton.ca/wiki/index.php?title=Operating_Systems_2019W_Lecture_1&diff=22114&oldid=prev 2019-01-14T23:40:32Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:40, 14 January 2019</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Video==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Video==</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Video from the lecture given on January 7, <del style="font-weight: bold; text-decoration: none;">2018 </del>[https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.m4v is now available].</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Video from the lecture given on January 7, <ins style="font-weight: bold; text-decoration: none;">2019 </ins>[https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.m4v is now available].</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Notes==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Notes==</div></td></tr> </table>

Soma https://homeostasis.scs.carleton.ca/wiki/index.php?title=Operating_Systems_2019W_Lecture_1&diff=22080&oldid=prev 2019-01-09T20:20:06Z

<p><span dir="auto"><span class="autocomment">Video</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:20, 9 January 2019</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Video==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Video==</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Video from the lecture given on January 7, 2018 [https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.<del style="font-weight: bold; text-decoration: none;">m4a </del>is now available].</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Video from the lecture given on January 7, 2018 [https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.<ins style="font-weight: bold; text-decoration: none;">m4v </ins>is now available].</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Notes==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Notes==</div></td></tr> </table>

Soma https://homeostasis.scs.carleton.ca/wiki/index.php?title=Operating_Systems_2019W_Lecture_1&diff=22077&oldid=prev 2019-01-08T03:59:07Z

<p>Created page with &quot;==Video== Video from the lecture given on January 7, 2018 [https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.m4a is now available]. =...&quot;</p> <p><b>New page</b></p><div>==Video==<br /> <br /> Video from the lecture given on January 7, 2018 [https://homeostasis.scs.carleton.ca/~soma/os-2019w/lectures/comp3000-2019w-lec01-20190107.m4a is now available].<br /> <br /> ==Notes==<br /> <br /> ===In class===<br /> <br /> &lt;pre&gt;<br /> Lecture 01<br /> ----------<br /> <br /> What is an operating system?<br /> <br /> * resource management<br /> * abstraction<br /> <br /> Software that turns the computer you have into the system you want to program<br /> <br /> Linux - operating system &quot;kernel&quot;<br /> <br /> &quot;GNU/Linux&quot; - because an OS is a kernel + other stuff, and GNU made a lot of<br /> the other stuff<br /> <br /> <br /> Security<br /> <br /> <br /> Threat model<br /> - every defense has limits<br /> - threat models capture the kinds of attacks a defense defends against<br /> <br /> Problem models<br /> - what problem are you trying to solve?<br /> - what are you assuming about the world?<br /> <br /> <br /> What happens when a program crashes?<br /> - program &quot;misbehaves&quot; and is shut down<br /> <br /> MS-DOS et al<br /> - &quot;operating systems&quot;, but not modern operating systems<br /> - yes: abstracts disk access<br /> - no: no support for running multiple programs safely<br /> <br /> - TSRs like sidekick allowed &quot;multiple&quot; programs to run at once<br /> (actually, allowed you to switch programs, in a hack-y way)<br /> <br /> Modern computers must multitask, because they have to deal with<br /> - user input/output<br /> - network input/output<br /> <br /> Someone has to be in charge on a modern operating system<br /> - allocate resources<br /> - deal with misbehaving programs<br /> <br /> <br /> The operating system kernel is what does the above<br /> <br /> The kernel runs first, so it gets the &quot;high ground&quot;<br /> - it gets first access to the hardware<br /> - hardware distinguishes between what is first run and the rest<br /> - hardware has &quot;modes&quot; for running different kinds of code<br /> <br /> How safe is it to depend on the &quot;who came first&quot;?<br /> <br /> <br /> F | E |<br /> i | m |<br /> r | a |<br /> e | c |<br /> f | s |<br /> o | |<br /> x | |<br /> ------------<br /> OS kernel<br /> ------------<br /> hardware<br /> <br /> running program on a modern OS: process<br /> requests from a process to the kernel: system calls<br /> <br /> system calls often look like function calls<br /> <br /> When you make a function call, the CPU jumps to the address of the function called (and arguments + return address are pushed on the stack)<br /> <br /> System calls require you to jump to a new address space and change CPU modes<br /> &lt;/pre&gt;</div>

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