October 2018
Beginner
794 pages
19h 23m
English
Content preview from Hands-On System Programming with Linux
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Interrupt context
At first glance, there appears to be no other way that kernel code executes. Well, think about this scenario: the network receive path. A network packet destined for your Ethernet MAC address arrives at the hardware adapter, the hardware detects that it's meant for it, collects it, and buffers it. It now must let the OS know; more technically, it must let the Network Interface Card (NIC) device driver know, so that it can fetch and process packets as they arrive. It kicks the NIC driver into action by asserting a hardware interrupt.
Recall that device drivers reside in kernel-space, and therefore their code runs in Supervisor or kernel Mode. The (kernel privilege) driver code Interrupt service routine (ISR) now executes, ...
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