Mac OS X Boot Process

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.

1. 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.
2. 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.
3. The operating system kernel, which is the core of the operating system, initializes the system and starts the system services.
4. The system services, such as the device drivers, are loaded and initialized.
5. The operating system loads the user profile and starts the user interface, such as the desktop or the login screen.
6. 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.

• • 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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• The Art of Unix Programming
• Test-Driven Development: By Example by Kent Beck
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• 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
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• Computer Graphics: Principles and Practice in C (2nd Edition)
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• 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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