Anonymous user
Interrupts: Difference between revisions
m
→Interrupt Overview
| [unchecked revision] | [unchecked revision] |
m (typos) |
|||
Line 12:
* '''Software Interrupt''': This is an interrupt signalled by software running on a CPU to indicate that it needs the kernel's attention. These types of interrupts are generally used for [[System Calls]]. On x86 CPUs, the instruction which is used to initiate a software interrupt is the "INT" instruction. Since the x86 CPU can use any of the 256 available interrupt vectors for software interrupts, kernels generally choose one. For example, many contemporary unixes use vector 0x80 on the x86 based platforms.
As a rule, where a CPU gives the developer the freedom to choose which vectors to use for what (as on x86), one should refrain from having interrupts of different types coming in on the same vector. Common practice is to leave the first 32 vectors for exceptions, as mandated by Intel. However
==From the keyboard's perspective==
| |||