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Chapter 1: Introduction
Chapter 1: Introduction

...  Security – defense of the system against internal and external attacks  Huge range, including denial-of-service, worms, viruses, identity theft, theft of service  Systems generally first distinguish among users, to determine who can do what  User identities (user IDs, security IDs) include name ...
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Import Settings: Base Settings: Brownstone Default Highest Answer
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Chapter 2: Operating-System Structures
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Real-time Operating Systems - Institute of Computer Engineering
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...  Tasks are executed inside kernel memory space, which prevents threads to be swapped-out and also the number of TLB misses is reduced.  Threads are executed in processor supervisor mode (i.e. ring level 0 in i386 arch), have full access to the underlying hardware.  Since the RTOS and the applicat ...
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Operating System Theory Guide to Operating Systems
Operating System Theory Guide to Operating Systems

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Hardware architecture of a Real Time Operating System
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... A real-time operating system (RTOS) is an operating system that supports and guarantees timely responses to external and internal events of real-time systems. An RTOS monitors, responds to, and controls an external environment, which is connected to the computer system through sensors, actuators, or ...
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Mobile operating system

A mobile operating system (or mobile OS) is an operating system for smartphones, tablets, PDAs, or other mobile devices. While computers such as the typical laptop are mobile, the operating systems usually used on them are not considered mobile ones as they were originally designed for bigger stationary desktop computers that historically did not have or need specific ""mobile"" features. This distinction is getting blurred in some newer operating systems that are hybrids made for both uses.Mobile operating systems combine features of a personal computer operating system with other features useful for mobile or handheld use; usually including, and most of the following considered essential in modern mobile systems; a touchscreen, cellular, Bluetooth, Wi-Fi, GPS mobile navigation, camera, video camera, speech recognition, voice recorder, music player, near field communication and infrared blaster.Mobile devices with mobile communications capabilities (e.g. smartphones) contain two mobile operating systems – the main user-facing software platform is supplemented by a second low-level proprietary real-time operating system which operates the radio and other hardware. Research has shown that these low-level systems may contain a range of security vulnerabilities permitting malicious base stations to gain high levels of control over the mobile device.
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