Search results
Results from the WOW.Com Content Network
The interrupt priority level (IPL) is a part of the current system interrupt state, which indicates the interrupt requests that will currently be accepted. The IPL may be indicated in hardware by the registers in a programmable interrupt controller , or in software by a bitmask or integer value and source code of threads.
Kernel page-table isolation (KPTI or PTI, [1] previously called KAISER) [2] [3] is a Linux kernel feature that mitigates the Meltdown security vulnerability (affecting mainly Intel's x86 CPUs) [4] and improves kernel hardening against attempts to bypass kernel address space layout randomization (KASLR).
The role of KMS (Kernel mode-setting), Linux example Wayland compositors require KMS (and also OpenGL ES and EGL ) evdev was the Linux kernel module that receives data from various Input devices such as Keyboard, Mouse, Touch-Pad, etc. Nowadays, this is the libinput module (for X and Wayland).
Furthermore, on a modern x86 system, BIOS calls can only be performed in Real mode, or Virtual 8086 mode. v8086 is not an option in Long mode. This means that a modern operating system, which operates in Protected mode (32 bit), or Long mode (64 bit), would need to switch into real mode and back to call the BIOS - a hugely expensive operation.
The distinction between user mode and kernel mode, which determines privilege level within the system, may also be used to distinguish whether a task is currently preemptable. Most modern operating systems have preemptive kernels , which are designed to permit tasks to be preempted even when in kernel mode.
Ideally, only highly trusted kernel code is allowed to execute in the unrestricted mode; everything else (including non-supervisory portions of the operating system) runs in a restricted mode and must use a system call (via interrupt) to request the kernel perform on its behalf any operation that could damage or compromise the system, making it ...
modprobe is a Linux program that provides for loading a loadable kernel module into a Linux kernel, unloading a loaded module and many other related features.It provides an ability to make decisions about which modules to load, awareness of module dependencies, so that when requested to load a module, it adds other required modules first and resolution of recursive module dependencies.
The descriptors may be either interrupt gates, trap gates or, for 32-bit protected mode only, task gates. Interrupt and trap gates point to a memory location containing code to execute by specifying both a segment (present in either the GDT or LDT) and an offset within that segment. The only difference between trap and interrupt gates is that ...