kernel 里面的中断代码分析

#endif
unsigned int move_irq; /* need to re-target IRQ dest */
#ifdef CONFIG_PROC_FS
#endif
struct proc_dir_entry *dir;
} ____cacheline_aligned;
重点分析 request_irq() 函数和 setup_irq() 函数 跟移植有关系的部分 。
Kernel/irq/manage.c =>request_irq()
int request_irq(unsigned int irq,
{
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char *devname, void *dev_id)
struct irqaction *action;
int retval;
#ifdef CONFIG_LOCKDEP
/*
#endif
* Lockdep wants atomic interrupt handlers:
*/
irqflags |= SA_INTERRUPT;
/*
* Sanity-check: shared interrupts must pass in a real dev-ID,
* otherwise we'll have trouble later trying to figure out
* which interrupt is which (messes up the interrupt freeing
* logic etc).
*/
if ((irqflags & IRQF_SHARED) && !dev_id)
return -EINVAL;
if (irq >= NR_IRQS)
return -EINVAL;
if (irq_desc[irq].status & IRQ_NOREQUEST) //这个要初始化,否则无法 request_irq , 显然这里应该在 kernel 启动的
过程调用 irq 相关的函数进行初始化
return -EINVAL;
if (!handler)
return -EINVAL;
action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);