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What is Mac OS X Boot Process:
The Mac OS X boot process involves several stages, in which the operating system performs various tasks to prepare the system for use.
- When the Mac is powered on, the firmware (a low-level software that controls the hardware) performs a power-on self-test (POST) to check the hardware components.
- The firmware loads the bootloader, which is responsible for loading the operating system kernel and transferring control to it. In Mac OS X, the bootloader is called the boot.efi file.
- The operating system kernel, which is the core of the operating system, initializes the system and starts the system services.
- The system services, such as the device drivers, are loaded and initialized.
- The operating system loads the user profile and starts the user interface, such as the desktop or the login screen.
- The user can log in and start using the system.
This is a general overview of the Mac OS X boot process. The exact sequence of events may vary depending on the specific version of Mac OS X and the hardware configuration of the system.
Boot ROM | Firmware. Part of Hardware system BootROM firmware is activated |
POST | Power-On Self Test initializes some hardware interfaces and verifies that sufficient memory is available and in a good state. |
EFI | Extensible Firmware Interface EFI does basic hardware initialization and selects which operating system to use. |
BOOTX | boot.efi boot loader load the kernel environment |
Rooting/Kernel | The init routine of the kernel is executed boot loader starts the kernel’s initialization procedure Various Mach/BSD data structures are initialized by the kernel. The I/O Kit is initialized. The kernel starts /sbin/mach_init |
Run Level | mach_init starts /sbin/init init determines the runlevel, and runs /etc/rc.boot, which sets up the machine enough to run single-user. rc.boot figures out the type of boot (Multi-User, Safe, CD-ROM, Network etc.) |
- Power is turned on.
- Open Firmware code is executed.
- Hardware information is collected and hardware is initialized.
- Something (usually the OS, but also things like the Apple Hardware Test, etc.) is selected to boot. The user may be prompted to select what to boot.
- Control passes to /System/Library/CoreServices/BootX, the boot loader. BootX loads the kernel and also draws the OS badges, if any.
- BootX tries to load a previously cached list of device drivers (created/updated by /usr/sbin/kextcache). Such a cache is of the type mkext and contains the info dictionaries and binary files for multiple kernel extensions. Note that if the mkext cache is corrupt or missing, BootX would look in /System/Library/Extensions for extensions that are needed in the current scenario (as determined by the value of the OSBundleRequired property in the Info.plist file of the extension’s bundle.
- The init routine of the kernel is executed. The root device of the booting system is determined. At this point, Open Firmware is not accessible any more.
- Various Mach/BSD data structures are initialized by the kernel.
- The I/O Kit is initialized.
- The kernel starts /sbin/mach_init, the Mach service naming (bootstrap) daemon. mach_init maintains mappings between service names and the Mach ports that provide access to those services.
From here on, the startup becomes user-level:
- mach_init starts /sbin/init, the traditional BSD init process. init determines the runlevel, and runs /etc/rc.boot, which sets up the machine enough to run single-user.
- rc.boot figures out the type of boot (Multi-User, Safe, CD-ROM, Network etc.). In case of a network boot (the sysctl variable kern.netboot will be set to 1 in which case), it runs /etc/rc.netboot with a start argument.
Source: http://osxbook.com/book/bonus/ancient/whatismacosx/arch_startup.html
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Linux Boot process
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Let’s describe Linux Boot Process:
The Linux boot process involves several stages, in which the operating system performs various tasks to prepare the system for use.
- When the system is powered on, the BIOS (Basic Input/Output System) or the UEFI (Unified Extensible Firmware Interface) performs a power-on self-test (POST) to check the hardware components and to load the bootloader.
- The bootloader, such as GRUB (GRand Unified Bootloader), is responsible for loading the operating system kernel and transferring control to it.
- The operating system kernel, which is the core of the operating system, initializes the system and starts the system services.
- The system services, such as the device drivers, are loaded and initialized.
- The operating system loads the user profile and starts the user interface, such as the desktop or the login screen.
- The user can log in and start using the system.
This is a general overview of the Linux boot process. The exact sequence of events may vary depending on the specific distribution of Linux and the hardware configuration of the system.
BIOS | Basic INPUT/OUTPUT System. Executes MBR |
MBR | Master Boot Record Executes GRUB |
GRUB | Grand Unified Bootloader Executes kernel |
KERNEL | Kernel Executes /sbin/init |
INIT | Init Executes Run level programs |
Run Level | Run Level Programs are executed from /etc/rc.d/rc*.d/ |
- As power comes up the BIOS is given control
- BIOS runs self tests, usually including cursory memory tests.
- The BIOS then loads the first sector of the disk to be used for booting and transfers control to it.
- The MBR code varies. One version will chain to the code in the first sector of the boot partition (Windows), another will load a bootloader. Windows boot proceeds from code and information in the boot partition.
- The bootloader chooses kernel location and version
- The bootloader prepares kernel and initrd image in memory, transfers control to kernel
- Loading kernel modules
- Discovering hardware and load additional kernel modules to support it
- Looking for disks
- R/O mount of / partition so that it can potentially be checked and repaired
- init process spawn
- /etc/inittab read and executing
- Mounting all FSes from /etc/fstab
- runlevels running (based on default runlevel in /etc/inittab) or another init method such as systemd or upstart
- rc.local
- login prompt
Source:
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List of Freely available programming books - What is the single most influential book every Programmers should read
- Bjarne Stroustrup - The C++ Programming Language
- Brian W. Kernighan, Rob Pike - The Practice of Programming
- Donald Knuth - The Art of Computer Programming
- Ellen Ullman - Close to the Machine
- Ellis Horowitz - Fundamentals of Computer Algorithms
- Eric Raymond - The Art of Unix Programming
- Gerald M. Weinberg - The Psychology of Computer Programming
- James Gosling - The Java Programming Language
- Joel Spolsky - The Best Software Writing I
- Keith Curtis - After the Software Wars
- Richard M. Stallman - Free Software, Free Society
- Richard P. Gabriel - Patterns of Software
- Richard P. Gabriel - Innovation Happens Elsewhere
- Code Complete (2nd edition) by Steve McConnell
- The Pragmatic Programmer
- Structure and Interpretation of Computer Programs
- The C Programming Language by Kernighan and Ritchie
- Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein
- Design Patterns by the Gang of Four
- Refactoring: Improving the Design of Existing Code
- The Mythical Man Month
- The Art of Computer Programming by Donald Knuth
- Compilers: Principles, Techniques and Tools by Alfred V. Aho, Ravi Sethi and Jeffrey D. Ullman
- Gödel, Escher, Bach by Douglas Hofstadter
- Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin
- Effective C++
- More Effective C++
- CODE by Charles Petzold
- Programming Pearls by Jon Bentley
- Working Effectively with Legacy Code by Michael C. Feathers
- Peopleware by Demarco and Lister
- Coders at Work by Peter Seibel
- Surely You're Joking, Mr. Feynman!
- Effective Java 2nd edition
- Patterns of Enterprise Application Architecture by Martin Fowler
- The Little Schemer
- The Seasoned Schemer
- Why's (Poignant) Guide to Ruby
- The Inmates Are Running The Asylum: Why High Tech Products Drive Us Crazy and How to Restore the Sanity
- The Art of Unix Programming
- Test-Driven Development: By Example by Kent Beck
- Practices of an Agile Developer
- Don't Make Me Think
- Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
- Domain Driven Designs by Eric Evans
- The Design of Everyday Things by Donald Norman
- Modern C++ Design by Andrei Alexandrescu
- Best Software Writing I by Joel Spolsky
- The Practice of Programming by Kernighan and Pike
- Pragmatic Thinking and Learning: Refactor Your Wetware by Andy Hunt
- Software Estimation: Demystifying the Black Art by Steve McConnel
- The Passionate Programmer (My Job Went To India) by Chad Fowler
- Hackers: Heroes of the Computer Revolution
- Algorithms + Data Structures = Programs
- Writing Solid Code
- JavaScript - The Good Parts
- Getting Real by 37 Signals
- Foundations of Programming by Karl Seguin
- Computer Graphics: Principles and Practice in C (2nd Edition)
- Thinking in Java by Bruce Eckel
- The Elements of Computing Systems
- Refactoring to Patterns by Joshua Kerievsky
- Modern Operating Systems by Andrew S. Tanenbaum
- The Annotated Turing
- Things That Make Us Smart by Donald Norman
- The Timeless Way of Building by Christopher Alexander
- The Deadline: A Novel About Project Management by Tom DeMarco
- The C++ Programming Language (3rd edition) by Stroustrup
- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
- Framework Design Guidelines by Brad Abrams
- Object Thinking by Dr. David West
- Advanced Programming in the UNIX Environment by W. Richard Stevens
- Hackers and Painters: Big Ideas from the Computer Age
- The Soul of a New Machine by Tracy Kidder
- CLR via C# by Jeffrey Richter
- The Timeless Way of Building by Christopher Alexander
- Design Patterns in C# by Steve Metsker
- Alice in Wonderland by Lewis Carol
- Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig
- About Face - The Essentials of Interaction Design
- Here Comes Everybody: The Power of Organizing Without Organizations by Clay Shirky
- The Tao of Programming
- Computational Beauty of Nature
- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
- Computability by N. J. Cutland
- Masterminds of Programming
- The Tao Te Ching
- The Productive Programmer
- The Art of Deception by Kevin Mitnick
- The Career Programmer: Guerilla Tactics for an Imperfect World by Christopher Duncan
- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
- Masters of Doom
- Pragmatic Unit Testing in C# with NUnit by Andy Hunt and Dave Thomas with Matt Hargett
- How To Solve It by George Polya
- The Alchemist by Paulo Coelho
- Smalltalk-80: The Language and its Implementation
- Writing Secure Code (2nd Edition) by Michael Howard
- Introduction to Functional Programming by Philip Wadler and Richard Bird
- No Bugs! by David Thielen
- Rework by Jason Freid and DHH
- JUnit in Action
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