System Calls
... OS • Use trap mechanism to switch to the kernel • Pass a number that represents the OS service (e.g., read) – System call number; usually set in a register • A system call does the following: – Set the system call number ...
... OS • Use trap mechanism to switch to the kernel • Pass a number that represents the OS service (e.g., read) – System call number; usually set in a register • A system call does the following: – Set the system call number ...
Charles Haiber`s presentation on Exokernels
... by kernels to enable as many types of applications to run on the system, tend to have a very high cost in system resources • Hurts the performance of applications • Hides information from applications • Limits the functionality of applications ...
... by kernels to enable as many types of applications to run on the system, tend to have a very high cost in system resources • Hurts the performance of applications • Hides information from applications • Limits the functionality of applications ...
ppt - Computer Science
... • Motivation: general purpose, UNIX-based operating systems can perform poorly when the applications have resource usage patterns poorly handled by kernel code • Objective: a general purpose OS capable of handling specialized needs as well, with better performance and no security threats ...
... • Motivation: general purpose, UNIX-based operating systems can perform poorly when the applications have resource usage patterns poorly handled by kernel code • Objective: a general purpose OS capable of handling specialized needs as well, with better performance and no security threats ...
Course Introduction - Washington University in St. Louis
... A great starting resource for kernel hackers Other class readings are relatively current documents about the Linux kernel Plan to look at a lot of source code in your “spare” time Course website provides a number of free/online references ...
... A great starting resource for kernel hackers Other class readings are relatively current documents about the Linux kernel Plan to look at a lot of source code in your “spare” time Course website provides a number of free/online references ...
Linux Basics
... As stated before, a system call is a request of code running in user mode to have something done by the kernel running in the kernel mode. The only way to switch from user mode to kernel mode is by generating an interrupt. Therefore at booting the kernel configures a special interrupt 0x80 to do suc ...
... As stated before, a system call is a request of code running in user mode to have something done by the kernel running in the kernel mode. The only way to switch from user mode to kernel mode is by generating an interrupt. Therefore at booting the kernel configures a special interrupt 0x80 to do suc ...
Summary for chapter 2 OPERATING SYSTEM nAJWA kNEFATI
... • User interface: take several forms. One is a command-line interface (CLI), which uses text commands . Another is a batch interface, in which commands and directives and most commonly, a graphical user interface (GUI). • Program execution: The program must be able to end its execution, either norma ...
... • User interface: take several forms. One is a command-line interface (CLI), which uses text commands . Another is a batch interface, in which commands and directives and most commonly, a graphical user interface (GUI). • Program execution: The program must be able to end its execution, either norma ...
PPT - DC214
... copy the code to the remote process directly now via WriteProcessMemory - and start its execution with CreateRemoteThread. ...
... copy the code to the remote process directly now via WriteProcessMemory - and start its execution with CreateRemoteThread. ...
μ-kernels Advantages Disadvantages Primitives in a μ
... – The process interrupts the µ-kernel which wakes up the device driver process. – The device driver process calls the I/O and blocks itself. – When the I/O is done, the µ-kernel gets the interrupt and wakes up the device driver process. – When the device driver process finishes, it interrupts the µ- ...
... – The process interrupts the µ-kernel which wakes up the device driver process. – The device driver process calls the I/O and blocks itself. – When the I/O is done, the µ-kernel gets the interrupt and wakes up the device driver process. – When the device driver process finishes, it interrupts the µ- ...
Course Introduction - Department of Computer Science
... There will be two lab assignments in the first 8 weeks of class. There will be a course project in the last 6 weeks of class. We will have a midterm and final exam. ...
... There will be two lab assignments in the first 8 weeks of class. There will be a course project in the last 6 weeks of class. We will have a midterm and final exam. ...
Section for Related Work % \section{Related Work} Rootkit detection
... in the context of servers and personal computers. However, there has been little research to date with respect to rootkit detection or prevention methods on smartphones such as Android. But, given the fact that the Android framework is built on top of the Linux kernel, many of the proposed methods t ...
... in the context of servers and personal computers. However, there has been little research to date with respect to rootkit detection or prevention methods on smartphones such as Android. But, given the fact that the Android framework is built on top of the Linux kernel, many of the proposed methods t ...
ISA_673-android_presentation_(3) - eee
... Records per-process usage of resources Records per-interval usage of battery Writes tab-separated data to proc_fs Interface allows easy instrumentation of kernel • Supports multiple instrumentation strategies ...
... Records per-process usage of resources Records per-interval usage of battery Writes tab-separated data to proc_fs Interface allows easy instrumentation of kernel • Supports multiple instrumentation strategies ...
ppt - Computer Science
... generation micro-kernels such as Mach or Chorus). Really fast message passing systems were needed to run device drivers and other performance critical components at the user-level. • So, programmers started to circumvent ipc. For example, co-locating device drivers and other components back into the ...
... generation micro-kernels such as Mach or Chorus). Really fast message passing systems were needed to run device drivers and other performance critical components at the user-level. • So, programmers started to circumvent ipc. For example, co-locating device drivers and other components back into the ...
AutoPod: Unscheduled System Updates with Zero Data Loss
... and Implementation of Zap: A System for Migrating Computing Environments. In Proceedings of the Fifth Symposium on Operating Systems Design and Implementation (OSDI 2002), ...
... and Implementation of Zap: A System for Migrating Computing Environments. In Proceedings of the Fifth Symposium on Operating Systems Design and Implementation (OSDI 2002), ...
Lecture 12: Protection: Kernel and Address Spaces 12.0 Main Points
... up between fork and exec. Child can access shell's data structures to see whether there is any I/O redirection, then sets it up before exec. ...
... up between fork and exec. Child can access shell's data structures to see whether there is any I/O redirection, then sets it up before exec. ...
System Calls,Kernel Mode, and Process
... A user program can’t access data belonging to the operating system or other user programs! ...
... A user program can’t access data belonging to the operating system or other user programs! ...
CS423/523
... computer's memory, there are two broad tasks to be accomplished: 1. Each process must have enough memory in which to execute, and respect memory boundaries of each other 2. Different types of memory must be used properly so that each process can run most effectively such as ...
... computer's memory, there are two broad tasks to be accomplished: 1. Each process must have enough memory in which to execute, and respect memory boundaries of each other 2. Different types of memory must be used properly so that each process can run most effectively such as ...
slides - Caltech
... • A lot of time spent up-front designing interfaces between the layers • Makes it much easier to identify and isolate bugs, though • Might actually save companies time in the long run, but companies are usually afraid of taking that risk • Layered approach can greatly reduce OS performance • Interac ...
... • A lot of time spent up-front designing interfaces between the layers • Makes it much easier to identify and isolate bugs, though • Might actually save companies time in the long run, but companies are usually afraid of taking that risk • Layered approach can greatly reduce OS performance • Interac ...
ISA_673-android_presentation_(1) - eee
... Operating Systems Security Exploring the Android Platform ...
... Operating Systems Security Exploring the Android Platform ...
What is an operating system? - KOVAN Research Lab
... System-call interface maintains a table indexed according to these numbers The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented Just needs to obey API and ...
... System-call interface maintains a table indexed according to these numbers The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented Just needs to obey API and ...
MachOs-by-Doug-Hill-Liza-Hill-Josh-Mickley-Alex
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...
Building the Wolfson Audio drivers into the kernel on
... the process of patching and re-compiling the kernel software on the Raspberry Pi in order to provide support for the Wolfson Audio Card. ...
... the process of patching and re-compiling the kernel software on the Raspberry Pi in order to provide support for the Wolfson Audio Card. ...
PowerPoint XP
... modules to provide user-level services User-level services used by privileged subsystems (parts of OS) true user programs ...
... modules to provide user-level services User-level services used by privileged subsystems (parts of OS) true user programs ...
OS Basics
... The computer's memory. Memory is used to store both program instructions and data. Typically, both need to be present in memory in order for a program to execute. Often multiple programs will want access to memory, frequently demanding more memory than the computer has available. The kernel is res ...
... The computer's memory. Memory is used to store both program instructions and data. Typically, both need to be present in memory in order for a program to execute. Often multiple programs will want access to memory, frequently demanding more memory than the computer has available. The kernel is res ...
Monolithic kernel vs. Microkernel
... A system more powerful than sockets are message queues. Built as a fifo queue, a message queue stores all incoming messages, sent by other processes and sorts them, based on their priority. One process can have more than one message queue, with every message queue being responsible for different kin ...
... A system more powerful than sockets are message queues. Built as a fifo queue, a message queue stores all incoming messages, sent by other processes and sorts them, based on their priority. One process can have more than one message queue, with every message queue being responsible for different kin ...
Microkernel Operating Systems
... E.g., interrupt handling, scheduling, programming the hardware E.g., memory management, file servers, network stack, device drivers ...
... E.g., interrupt handling, scheduling, programming the hardware E.g., memory management, file servers, network stack, device drivers ...
Kernel (operating system)
In computing, the kernel is a computer program that manages I/O requests from software, and translates them into data processing instructions for the central processing unit and other electronic components of a computer. The kernel is a fundamental part of a modern computer's operating system.The critical code of the kernel is usually loaded into a protected area of memory, which prevents it from being overwritten by other, less frequently used parts of the operating system or by applications. The kernel performs its tasks, such as executing processes and handling interrupts, in kernel space, whereas everything a user normally does, such as writing text in a text editor or running programs in a GUI (graphical user interface), is done in user space. This separation prevents user data and kernel data from interfering with each other and thereby diminishing performance or causing the system to become unstable (and possibly crashing). When a process makes requests of the kernel, the request is called a system call. Various kernel designs differ in how they manage system calls and resources. For example, a monolithic kernel executes all the operating system instructions in the same address space in order to improve the performance of the system. A microkernel runs most of the operating system's background processes in user space, to make the operating system more modular and, therefore, easier to maintain.The kernel's interface is a low-level abstraction layer.