user mode
... 1. System call traps to the kernel (kernel mode) 2. Kernel determines service routine required 3. Kernel services the call. 4. Control is returned to user program (user mode) ...
... 1. System call traps to the kernel (kernel mode) 2. Kernel determines service routine required 3. Kernel services the call. 4. Control is returned to user program (user mode) ...
資工系網媒所NEWS實驗室Chapter 2
... correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
LECTURE 33 APPLICATION I/O INTERFACE
... is in application (personality of file lost) Memory-mapped (to VM) file access possible - use memory instructions rather than I/O instructions - very efficient (ex: swap space for disk). Device driver xfr’s blocks at a time - as in paging DMA transfer is block oriented Character devices incl ...
... is in application (personality of file lost) Memory-mapped (to VM) file access possible - use memory instructions rather than I/O instructions - very efficient (ex: swap space for disk). Device driver xfr’s blocks at a time - as in paging DMA transfer is block oriented Character devices incl ...
System
... Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
Chapter 1 PowerPoint
... • Interrupt transfers control to the interrupt service routine generally, through the interrupt vector, which contains the addresses of all the service routines. • Interrupt architecture must save the address of the interrupted instruction. • A trap is a software-generated interrupt caused either by ...
... • Interrupt transfers control to the interrupt service routine generally, through the interrupt vector, which contains the addresses of all the service routines. • Interrupt architecture must save the address of the interrupted instruction. • A trap is a software-generated interrupt caused either by ...
OS Services System calls and their types
... • Varies between Command-Line (CLI), Graphics User Interface (GUI), Batch – Program execution - The system must be able to load a program into memory and to run that program, end execution, either normally or abnormally (indicating error) – I/O operations - A running program may require I/O, which m ...
... • Varies between Command-Line (CLI), Graphics User Interface (GUI), Batch – Program execution - The system must be able to load a program into memory and to run that program, end execution, either normally or abnormally (indicating error) – I/O operations - A running program may require I/O, which m ...
Slide 1
... diff – compares files head, tail – prints the first/last N lines of the input wc – word count (also counts characters and lines) more – pager (allows you to scroll the input for easy viewing) less – better version of more grep – print lines matching a pattern find – search for files ...
... diff – compares files head, tail – prints the first/last N lines of the input wc – word count (also counts characters and lines) more – pager (allows you to scroll the input for easy viewing) less – better version of more grep – print lines matching a pattern find – search for files ...
Thomas Edison Associates Report on how to install and optimizing
... The basic function of an Operating System is to control all the Hardware and Software installed in a computer. We can't even install a software without the help of an Operating System. The Operating System acts as a middleman between the user and the computer. It allows the user to install software ...
... The basic function of an Operating System is to control all the Hardware and Software installed in a computer. We can't even install a software without the help of an Operating System. The Operating System acts as a middleman between the user and the computer. It allows the user to install software ...
11.4 Software Operating Systems
... FatMax 2007. Licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License ...
... FatMax 2007. Licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License ...
Batching processing
... A timer circuit counts down the quantum and generates an interrupt at the end. Such process switch involves updating the snapshot of the current process, restoring the snapshot of the next process, and then starting its execution. A program, called interrupt handler, is run for scheduler to update t ...
... A timer circuit counts down the quantum and generates an interrupt at the end. Such process switch involves updating the snapshot of the current process, restoring the snapshot of the next process, and then starting its execution. A program, called interrupt handler, is run for scheduler to update t ...
Operating Systems 2
... Components of an operating system Any access to a file is obtained at the discretion of the file manager. The procedure begins by requesting that the file manager grant access to the file through procedure known as opening the file. If the file manager approves the requested access, it provides ...
... Components of an operating system Any access to a file is obtained at the discretion of the file manager. The procedure begins by requesting that the file manager grant access to the file through procedure known as opening the file. If the file manager approves the requested access, it provides ...
again, but this time for OSDI. OSDI and
... Patterson [1] about caches and cache coherence. If you don’t have access to this book, Wikipedia has a very decent entry on caches [2]. Many TM approaches rely on tags added to caches for their operation, and the tags themselves are related to cache coherency. Recall that only registers can access d ...
... Patterson [1] about caches and cache coherence. If you don’t have access to this book, Wikipedia has a very decent entry on caches [2]. Many TM approaches rely on tags added to caches for their operation, and the tags themselves are related to cache coherency. Recall that only registers can access d ...
Computer Connections: Lesson 6 – Operating Systems
... The most important program on any computer is the Operating System or OS. The OS is a large program made up of many smaller programs that control how the CPU communicates with other hardware components. It also makes computers easier to operate by people who don't understand programming languages. I ...
... The most important program on any computer is the Operating System or OS. The OS is a large program made up of many smaller programs that control how the CPU communicates with other hardware components. It also makes computers easier to operate by people who don't understand programming languages. I ...
Introduction and Overview - Pages
... • Virtualize resources so multiple users or applications can share • Protect applications from one another • Provide efficient and fair access to resources ...
... • Virtualize resources so multiple users or applications can share • Protect applications from one another • Provide efficient and fair access to resources ...
OS API
... A file handle is a small integer, valid only within a single process, to operate on the device or file Pathname: a name in the file system. In unix, devices are put under /dev. E.g. /dev/ttya is the first serial port, /dev/sda the first SCSI drive Flags: read only, read/write, append etc… Mode may b ...
... A file handle is a small integer, valid only within a single process, to operate on the device or file Pathname: a name in the file system. In unix, devices are put under /dev. E.g. /dev/ttya is the first serial port, /dev/sda the first SCSI drive Flags: read only, read/write, append etc… Mode may b ...
Booting a PC
... The 384KB area from 0x000A0000 through 0x000FFFFF was reserved by the hardware for special uses such as video display buffers and firmware held in nonvolatile memory. The most important part of this reserved area is the Basic Input/Output System (BIOS), which occupies the 64KB region from 0x000F0000 ...
... The 384KB area from 0x000A0000 through 0x000FFFFF was reserved by the hardware for special uses such as video display buffers and firmware held in nonvolatile memory. The most important part of this reserved area is the Basic Input/Output System (BIOS), which occupies the 64KB region from 0x000F0000 ...
Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights... McGraw-Hill Technology Education
... • Command line interfaces – Older interface • DOS, Linux, UNIX ...
... • Command line interfaces – Older interface • DOS, Linux, UNIX ...
Chapter 2 – Operating System Overview
... 7. The central theme of modern operating systems, based on the concept of switching among multiple programs in memory, is called __________________. ...
... 7. The central theme of modern operating systems, based on the concept of switching among multiple programs in memory, is called __________________. ...
Structure of Operating Systems
... • In the idle loop: – OS executes an infinite loop (UNIX) – OS performs some system management & profiling – OS halts the processor and enter in low-power mode (notebooks) – OS computes some function (DEC’s VMS on VAX computed Pi) • OS wakes up on: – interrupts from hardware devices – traps from use ...
... • In the idle loop: – OS executes an infinite loop (UNIX) – OS performs some system management & profiling – OS halts the processor and enter in low-power mode (notebooks) – OS computes some function (DEC’s VMS on VAX computed Pi) • OS wakes up on: – interrupts from hardware devices – traps from use ...
Introduction
... like its keyboard, mouse, video display, and network card, as well as other more optional devices, like a scanner, Wi-Fi interface, video camera, USB ports, etc. • Each such device is represented in an operating system using a device driver, which encapsulates the details of how interaction with tha ...
... like its keyboard, mouse, video display, and network card, as well as other more optional devices, like a scanner, Wi-Fi interface, video camera, USB ports, etc. • Each such device is represented in an operating system using a device driver, which encapsulates the details of how interaction with tha ...
slides - network systems lab @ sfu
... Performs diagnostic tests (Power-on Self Testing) Loads a small piece of code from a fixed location (block 0) on the disk into memory, which loads the rest of the loader from disk, which loads kernel itself ...
... Performs diagnostic tests (Power-on Self Testing) Loads a small piece of code from a fixed location (block 0) on the disk into memory, which loads the rest of the loader from disk, which loads kernel itself ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.