Ebook Free , by Lucus Darnell
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, by Lucus Darnell
Ebook Free , by Lucus Darnell
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Product details
File Size: 2804 KB
Print Length: 151 pages
Simultaneous Device Usage: Unlimited
Publication Date: August 21, 2016
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B01KU8N6FC
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Amazon Best Sellers Rank:
#195,533 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
I am not big on writing negative reviews. That being said I need to explain why I gave it only two stars. I will begin with the amount of serious typo's in this book. There are some horrible typo's that will have beginners flustered beyond all belief. I could not get the original code that combines Assembly and C to actually boot in a VM. I believe the author has a few errors that I am not skilled enough to trace back yet. I have spent the last 4 weeks trying to figure out the bug in his code for terminal and video code written in C. If you are a beginner and you looking to learn read this book with an open mind but also realize it has some flaws in it so doing the examples will lead you to frustration. I have tried tracking down the author but I was not able to find a errata page or a web site.
If you think a bare-metal program that jams "Hello world!" into a display controller is an operating system, you'll love it. If you think you can write an interrupt handler without knowing what a stack frame is, you're headed for Dunning-Kruger gold, and this your guidebook.I've written bare-metal applications, and it's a lot of fun. I've done Unix-class operating system development, and it's a lot of fun, and have had fun writing the kind of device driver that lives on a network card ROM where cold start can find it for network booting. (I've also done compiler and mainframe instruction set microcode development, and those are fun, too, but off topic.)Among very many other things:-- You don't see "nothing" after a C string's image in memory. You see a NUL (zero) byte, and that's part of the string, NUL termination is part of the string. Being unable to predict or trust a value is nothing - cold, hard, known, reliable zero isn't nothing..-- Back in the 1970s, functions like 'strcat' were considered system utilities. Now, they're security vulnerabilities. Please do not accept the suggestion that you include these in your 'operating system'.-- Synchronization primitives might start, but do not end with turning off interrupts. Not by a half-century of computer science and computer architecture development.This developer seems proud of his IoT (Internet of Things) development experience. Well, the recent Mirai attack turned IoT devices (including many security cameras) into advertisements for male enhancement products. I fully understand the "It's Easy! It's Fun!" approach to software development, especially at the lower levels.I also understand the responsibilities or real engineers in building our world. I don't hold a PE as an engineer (unlike other PEs in my family), even software engineer, but I agree strongly with certification for engineers doing life-critical work, I'm well aware of MISRA, FDA,FAA, and DOE standards for software reliability, So, I find it quite odd that this author shows no such awareness.It's fun, yes, it's huge fun. (I've done about as much programming in VHDL as I have in various assemblers or Java.) But, when "the patient might die" or " the bank lost all its money" or "so sorry about that missile" is a possible outcome, it isn't easy."Hello world!" is not an operating system. Normally, I'd put an unwanted book back into the library system or used market. This time, I feel morally impelled to keep it out of of others' hands. I hope the recycled pulp will make someone's life better. This text certainly won't.-- wiredweird.PS: My wife has been nagging me about writing my own OS text for developers involved with embedded systems; I consider this a kick in the pants. I've taught university OS courses for CS and for EE students, and I think the latter are direly under-served. As an OS text, this serves no one well.
This book has done wonders for me. I am developing my own operating system, better understanding of architecture and how modern computers work, giving me a much firmer understanding of the development cycle in C and assembler close to the metal and even using virtualization. I litterally have 20 major ah-ha's that I can apply to my work as a developer.There are 2 errors I've found so far but I have learned from sorting them out (SO I will share)1. Config of CentOS also requires this to run :yum groupinstall "Development Tools".2. His make file links against start.o (from start.asm) and his example in code was boot.asmI am glad these typos are there as I internalized what I was doing better by figuring it out.Moral: It's a thin book. IF you really want to understand it you should also plan to learn nasm, gcc (and the linker), CentOS, and virualBox and Grub. But, then, if you want to do this kind of stuff its part of the tuition.
This book guides you through a process of creating a very basic, mostly no-op kernel ("hello world" kernel) for x86 (32-bit) system. There is an introduction to C and Assembley programming languages, introduction to booting process (even writing a basic bootloader). The good part is that this book is motivating: it encourages you to explore the amazing world of low-level systems programming, and it lets you start almost from zero, with little (or no) software development background. The author guides you through a process of creating your own operating system, saving your time to focus on development of OS kerneal and not on fighting with virtual machines/building OS images. The bad part is that it is not as deep as you may expect: operating system is not just something that works directly on a hardware, it is also provides abstraction and isolation mechanisms, managment of resources. So you won't find there information on how virtual memory should work, how processes should run and how to write own file system.If you want to jump start into development of the operating systems, it is a good starting point. But don't expect to find there answers to all possible problems you'll have to solve before you could say "hey, here's my working operating system, try doing something useful on top of it".
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