2.01 - Computer Science at Rutgers
... In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by the program and popped off the stack by the ...
... In some cases, may be more parameters than registers Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by the program and popped off the stack by the ...
Lecture 1 - Operating System Overview
... Each view considers use of computer system for intended purpose but ignores other elements Commonality in the views : Utilization of computer system for specific purpose OS : Something that allows the user to achieve the intended purpose of using the computer system in a fast and efficient manner ...
... Each view considers use of computer system for intended purpose but ignores other elements Commonality in the views : Utilization of computer system for specific purpose OS : Something that allows the user to achieve the intended purpose of using the computer system in a fast and efficient manner ...
Operating-System Structures
... so the hardware can start it: – Small piece of code – bootstrap loader/program, locates the OS kernel, loads it into memory, and starts execution. – Sometimes two-step process where boot block at fixed location loads bootstrap loader. – Typically stored in ROM or EPROM, generally known as firmware. ...
... so the hardware can start it: – Small piece of code – bootstrap loader/program, locates the OS kernel, loads it into memory, and starts execution. – Sometimes two-step process where boot block at fixed location loads bootstrap loader. – Typically stored in ROM or EPROM, generally known as firmware. ...
The Unix Philosophy
... The Unix Shell provides a command interpreter to allow the user to communicate with the computer system (both on a software and hardware basis). There are thousands of commands available. Many of these commands or "utilities" are available for the regular user. There are also commands that are avail ...
... The Unix Shell provides a command interpreter to allow the user to communicate with the computer system (both on a software and hardware basis). There are thousands of commands available. Many of these commands or "utilities" are available for the regular user. There are also commands that are avail ...
The OS 215 Project
... Start_timer calls the Z215_DELAY_TIMER to give the request for a future interrupt. The timer starts thinking about the time, but interrupts in the future!! Start_timer realizes there’s nothing else to do and so calls Z215_IDLE. This routine says to idle the processor until an interrupt occurs. Svc m ...
... Start_timer calls the Z215_DELAY_TIMER to give the request for a future interrupt. The timer starts thinking about the time, but interrupts in the future!! Start_timer realizes there’s nothing else to do and so calls Z215_IDLE. This routine says to idle the processor until an interrupt occurs. Svc m ...
choices
... systems) – The distributed file system extension of Choices is close to the mechanism used in MMLite (proxy) – MMLite focuses on support for transparently replacing components in use ...
... systems) – The distributed file system extension of Choices is close to the mechanism used in MMLite (proxy) – MMLite focuses on support for transparently replacing components in use ...
Operating systems Operating systems Protected Objects
... acts as an intermediary between a user of a computer and the computer hardware. • The purpose is to provide an environment in which a user can execute programs in a convenient and efficient manner. ...
... acts as an intermediary between a user of a computer and the computer hardware. • The purpose is to provide an environment in which a user can execute programs in a convenient and efficient manner. ...
Chapter 4 (b) - Jhasudan.com.np
... The file system is one of the major subsystems of the operating system. ◦ It is responsible for storing information on disk drives and retrieving and updating this information as directed by the user or by a program. ◦ The UNIX operating system regards practically every assemblage of information as ...
... The file system is one of the major subsystems of the operating system. ◦ It is responsible for storing information on disk drives and retrieving and updating this information as directed by the user or by a program. ◦ The UNIX operating system regards practically every assemblage of information as ...
Operating System Services
... May occur in the CPU and memory hardware, in I/O devices, in user program ...
... May occur in the CPU and memory hardware, in I/O devices, in user program ...
Software Platform based Embedded Multiprocessor SoC Prototyping
... code can be parameterized in a number of ways through the use of pre-processor variable definitions within the code. Once the libraries have been compiled for specific target architecture the application code can be linked to the software libraries in order to make an ELF file that can be used to bo ...
... code can be parameterized in a number of ways through the use of pre-processor variable definitions within the code. Once the libraries have been compiled for specific target architecture the application code can be linked to the software libraries in order to make an ELF file that can be used to bo ...
Introduction
... as a single computer. Figure 1-2c shows a different type of architecture, generally referred to as a multicomputer, where each CPU has not only its own local memory but also its own set of storage and communication devices. Among the communication devices are special network controllers, which allow ...
... as a single computer. Figure 1-2c shows a different type of architecture, generally referred to as a multicomputer, where each CPU has not only its own local memory but also its own set of storage and communication devices. Among the communication devices are special network controllers, which allow ...
Lecture 5
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, stores a new address in the interrupt ...
... Must ensure that a user program could never gain control of the computer in monitor mode (I.e., a user program that, as part of its execution, stores a new address in the interrupt ...
CHAPTER 1: Computer Systems
... System Status Information Common system status commands Amount of available disk space Amount of available memory Number of users on the system and who they are % of time that CPU and I/O channels are busy ...
... System Status Information Common system status commands Amount of available disk space Amount of available memory Number of users on the system and who they are % of time that CPU and I/O channels are busy ...
Lecture 16
... System Status Information Common system status commands Amount of available disk space Amount of available memory Number of users on the system and who they are % of time that CPU and I/O channels are busy ...
... System Status Information Common system status commands Amount of available disk space Amount of available memory Number of users on the system and who they are % of time that CPU and I/O channels are busy ...
Introduction
... protection code. – The protection code consists of three 3-bit fields, one for owner, one for group, and one for others. – Each field has a bit for read, a bit for write, and a bit for execute. They are known as rwx bits. ...
... protection code. – The protection code consists of three 3-bit fields, one for owner, one for group, and one for others. – Each field has a bit for read, a bit for write, and a bit for execute. They are known as rwx bits. ...
Lecture 13: Introduction of Microcontroller Hardware
... provides timing and event-counting functions and/or general purpose digital I/0. ...
... provides timing and event-counting functions and/or general purpose digital I/0. ...
Operating System Architecture and Distributed Systems
... Threads support treating of requests with varying priorities. Various types of architectures can be used in current processing: ...
... Threads support treating of requests with varying priorities. Various types of architectures can be used in current processing: ...
Interfacing with the Operating System
... • Input and output refers not just to the stuff that you read in and write out when you run your program, but also to interaction with peripheral devices (printers etc). • Fortunately we can use the same model for both: writing something out on the user's screen, writing to a file, and writing to a ...
... • Input and output refers not just to the stuff that you read in and write out when you run your program, but also to interaction with peripheral devices (printers etc). • Fortunately we can use the same model for both: writing something out on the user's screen, writing to a file, and writing to a ...
Operating Systems I Supervision Exercises
... part of a process’s context when switching to another process? (iii ) A system designer optimises the saving and restoring of registers, so that the cost of doing so is negligible. He claims that there is now no performance penalty in frequently switching between address spaces. Supposing that his o ...
... part of a process’s context when switching to another process? (iii ) A system designer optimises the saving and restoring of registers, so that the cost of doing so is negligible. He claims that there is now no performance penalty in frequently switching between address spaces. Supposing that his o ...
System Calls
... • Privilege mode bit indicates if the current program can perform privileged operations – On system startup, privilege mode is set to 1, and the processor jumps to a well-known address – The operating system (OS) boot code resides at this address – The OS sets up the devices, loads applications, and ...
... • Privilege mode bit indicates if the current program can perform privileged operations – On system startup, privilege mode is set to 1, and the processor jumps to a well-known address – The operating system (OS) boot code resides at this address – The OS sets up the devices, loads applications, and ...
PowerPoint - cse.sc.edu
... • The kernel implements a set of special routines • A user program invokes a routine in the kernel by issuing a hardware TRAP • The trap switches the CPU into a privileged mode and the kernel executes the system call • The CPU goes back to user mode • A C language API exists for all system calls ...
... • The kernel implements a set of special routines • A user program invokes a routine in the kernel by issuing a hardware TRAP • The trap switches the CPU into a privileged mode and the kernel executes the system call • The CPU goes back to user mode • A C language API exists for all system calls ...
UNICOS, FORTRAN 90, NQS
... • Shells - A shell provides an interface between the user and the kernel. The shell interprets commands and command options entered at the command-line prompt and initiates the appropriate actions in the kernel. – UNICOS supports two shells: • The Korn shell (default) • The C shell ...
... • Shells - A shell provides an interface between the user and the kernel. The shell interprets commands and command options entered at the command-line prompt and initiates the appropriate actions in the kernel. – UNICOS supports two shells: • The Korn shell (default) • The C shell ...
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.