The iPhone Mac OS X by bestt571

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									The iPhone OS X
The iPhone
   Miriam O Connell
   Caroline Byrnes
Content
   Introduction / history.
   Advantages
   Apps
   Architecture
   4 layered Operating system.
   Memory Management
   CPU
   Multitasking.
   The Future
Introduction
   Quad-Band Mobile phone with
    multimedia capabilities.
   iPhone OS X- based on Mac OS X
    •   Difference is multi-touch interface and accelerometer support.

   Unix kernel.
   Touch screen.
   Supports 3rd-party applications.
History
   Apple Engineers directed to look into touch
    screens.
   January 2007 iphone announced at
    Macworld convention.
   June 2007: Went on sale in U.S.
   Spring 2008:available in Ireland.
   iPhone 3G – with refreshed hardware.
Advantages over other platforms
such as Linux and Windows

   Aqua UI takes up less system resources than
    Windows's Aero UI.
   Better security
   Most revolutionary user interface since the mouse
    (multi-touch display)
   Advanced Safari browser: lets you see any web
    page the way it was designed to be seen
Applications




     Piano App-     FlightTrack-get
      Turns the     Up-to-date flight info
    iPhone into a
        piano
7 Layer Architecture




   Diagram of the iPhone's Archicture
   http://thecoffeedesk.com/news/index.php/2009/05/17/iphone-architecture/
Lower 3 Layers
   Processor: Refers to the ARM instruction set and the
    interrupt descriptor table as set up by the iPhone OS during
    boot and driver initialization.
   Firmware: Although we refer to the entire OS as “firmware”,
    this layer instead references the chip-specific code that is
    either contained with memory in/around the peripheral itself,
    or within the driver for said peripheral (example: touch
    screen or gyroscope)
   Hardware: Refers to the physical chips soldered to the
    iPhone’s circuit. The actual processor falls under this layer,
    but the instruction set and in-memory descriptor tables are
    contained within the “processor” layer.
IPhone OS
   Takes up half a GB of devices total storage.
   Supports bundled apps from apple and third
    party developers.
   Designed to only run software with apple-
    approved cryptographic software.
   Can be overcome by ‘jail-breaking’.
Four Layerd iOS
1) Cocoa Touch Layer (upper layer).
2) Media Layer .
3) Core Services Layer .
4) Core OS Layer (kernel).
Four Layers
   1. Upper Layer(cocoa touch layer)
    •   ULKit framework
    •   Foundation framework


   2. Media Layer
    •   Core graphics framework
    •   Quartz core framework
    •   Media player framework
Four Layers cont…
   3. Core services layer
    •   Core foundation network – set of c based interfaces that provide
        basic data management and service features for applications.
    •   CFNetwork
    •   Security
    •   XML support

   4. Core OS layer
    •   Kernel
Memory Management
4) Core OS Layer(deepest layer)

   Made up of the kernel environment, drivers and basic
    interfaces of the OS.
   Kernel (Darwin) manages the virtual memory system.
   The drivers provide the interface between the
    available hardware and system frameworks.
Memory Management

4) Core OS Layer(deepest layer)
cont

   For security purposes access to the kernel and
    drivers is restricted.
   Low level features can be accessed through a set of
     interfaces (Apps)
   This is done using the LibSystem library.
CPU: Features of ARM Processor

   High performance integer processor
   High performance memory system.
    -Supports 4-64K cache sizes
    -Optional tightly coupled memories
    with DMA for apps.
    -ARMv6 memory system accelerates
    OS context-switch.
CPU
   Powered by ARM class CPU capable of a speed of 667MHz.
   However, due to power consumption of and operating
    temperature, the first CPU ran at 412MHz.
   If run at full speed, iPhone would have 15% less battery life
    and would be warm to the touch.
   Firmware Update 1.2 then boosted the iPhone clock speed to
    533MHz.
   Kernel level changes counteracted the battery life reduction.
CPU




 iPhone 3G S (left) & iPhone 3G (right)
 www.wired.com
CPU
   Current Spec

RAM: 256MB
Processor: 600 MHz
The iPhone Mac OS X:
      - Multi-tasking
Multi-tasking
   Running two or more programs at the same time on the same
    single-processor computer.

   Iphones 3.X software is a fully pre-emptive multitasking OS.

   Does not allow third-party developers to use multi-tasking.

   Problems with multi-tasking.
    •   Slows the system down
    •   Increases battery usage
    •   Security(spyware, adware and viruses)
Multi-tasking cont…
   Apples Solution….
   Push notifications
    •   Pushes all the data as notifications to inactive iPhone apps.
    •   Saves battery
             iPad
Based on:Mac OS X v10.5.8 or later
iPad-Benefits
   Portable
   Affordable($499)
   Cross-compatible with the iPhone
iPad-Limitations
   No multithreading.
   The iPhone OS can't run background
    processes.
   It can't have two apps open at the
    same time. Can’t toggle between a
    Web browser and a word processor.
   A lack of support for Adobe Flash.
The Future…
   iPhone OS X 4.0 due out this summer
   Will deliver the features business professionals need.
   The iPad can then act as a notebook replacement
   Will provide IT administrators with the functions they
    need to effectively manage remote iPhones and iPads.
   Improved security and encryption features
   Multitasking-Developers will have access to seven multitasking
    services, which will allow tasks to be performed in the background
    while preserving performance and battery life.
Any Questions
References
   http://www.slashgear.com/iphone-3g-s-processor-and-ram-det
   http://www.everyipod.com/iphone-faq
   http://www.macocrumors.com/articles/iphone-cpu-speed/Spee
   http://www.endgadget.com/2009/06/10/iphone-3g-s-processor
   http://www.apple.com
   http://www.gsmarena.com/apple_iphone_4g-3275.php
   http://www.chaione.com/iphone-os-technology-layers/
References
   http://en.wikipedia.org/wiki/Architecture_of_Mac_OS_X
   http://www.wired.com/gadgetlab/2009/06/gallery-
    deep-inside-the-iphone-3g-s/
   http://developer.apple.com/iphone/library/referencelibrary/G
   http://www.spazioiphone.com/wordpress/wp-content/upload
   www.oppapers.com/essays/apple-iphone.
   http://mad_ip.eu/files/reports/iphone.pdf

								
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