Linux中断分析（原创）

Irq 分析

in the /kernel/irq/manage.c 中

一

int request_irq(unsigned int irq, irq_handler_t handler,

unsigned long irqflags, const char *devname, void *dev_id) {

｝

*request_irq - allocate an interrupt line

* @irq: Interrupt line to allocate

* @handler: Function to be called when the IRQ occurs

* @irqflags: Interrupt type flags

* @devname: An ascii name for the claiming device

• @dev_id: A cookie passed back to the handler function

This call allocates interrupt resources and enables the interrupt line and IRQ handling .

二

void free_irq(unsigned int irq, void *dev_id)

{

}

free_irq - free an interrupt

* @irq: Interrupt line to free

* @dev_id: Device identity to free

Remove an interrupt handler . The handler is removed an if the interrupt line is no longer in use by any driver int is disabled.

三

int setup_irq(unsigned int irq, struct irqaction *new)

{

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internal function to register an irqaction – typically used to allocate special interrupts that are part of the architecture

四

linux/arch/arm/kernel/irq.c

This file contains the code used by various IRQ handling routines: installing new handlers should be easier

linux/arch/arm/kernel/fiq.c

set_fiq_handler

set_fiq_regs

get_fiq_regs

release_fiq

enable_fiq