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An interrupt vector table (IVT) is a data structure that associates a list of interrupt handlers with a list of interrupt requests in a table of interrupt vectors. Each entry of the interrupt vector table, called an interrupt vector, is the address of an interrupt handler (also known as ISR). While the concept is common across processor ...
The interrupt descriptor table (IDT) is a data structure used by the x86 architecture to implement an interrupt vector table. The IDT is used by the processor to determine the memory addresses of the handlers to be executed on interrupts and exceptions. The details in the description below apply specifically to the x86 architecture.
On x86 CPUs, when an interrupt occurs, the ISR to call is found by looking it up in a table of ISR starting-point addresses (called "interrupt vectors") in memory: the Interrupt vector table (IVT). An interrupt is invoked by its type number, from 0 to 255, and the type number is used as an index into the Interrupt Vector Table, and at that ...
Load IDTR (Interrupt Descriptor Table Register) from memory. [ b ] The IDTR controls not just the address/size of the IDT ( interrupt Descriptor Table ) in protected mode , but the IVT (Interrupt Vector Table) in real mode as well.
In a computer, an interrupt request (or IRQ) is a hardware signal sent to the processor that temporarily stops a running program and allows a special program, an interrupt handler, to run instead. Hardware interrupts are used to handle events such as receiving data from a modem or network card , key presses, or mouse movements.
(Note that on the 80186 and earlier, the first kilobyte of the address space, starting at address 0, is the permanent, immovable location of the interrupt vector table.) So, the actual amount of memory addressable by the 80286 and later x86 CPUs in real mode is 1 MB + 64 KB – 16 B = 1,114,096 B.
The original DOS API in 86-DOS and MS-DOS 1.0 was designed to be functionally compatible with CP/M.Files were accessed using file control blocks (FCBs). The DOS API was greatly extended in MS-DOS 2.0 with several Unix concepts, including file access using file handles, hierarchical directories and device I/O control. [1]
Interrupt Vector Table of x86 processors running in real mode. Arrows indicate direction of increasing addresses. Date: 23 August 2014, 12:56 (UTC) Source: Hand-written SVG. Author: Keφr: Permission (Reusing this file) Released into public domain.