linux下IRQ和软中断处理函数定义

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0~31是不可屏蔽的中断和异常

32~47是IRQ中断

48~255是软中断

0x80 系统调用的

IRQ和软中断的定义如下：

在arch/x86_64/i8259.c中

void (*interrupt[NR_IRQS])(void) = {
IRQLIST_16(0x0),

#ifdef CONFIG_X86_IO_APIC
IRQLIST_16(0x1), IRQLIST_16(0x2), IRQLIST_16(0x3),
IRQLIST_16(0x4), IRQLIST_16(0x5), IRQLIST_16(0x6), IRQLIST_16(0x7),
IRQLIST_16(0x8), IRQLIST_16(0x9), IRQLIST_16(0xa), IRQLIST_16(0xb),
IRQLIST_16(0xc), IRQLIST_16(0xd)

#ifdef CONFIG_PCI_MSI
, IRQLIST_14(0xe)
#endif

#endif
};

#define IRQ(x,y) \
IRQ##x##y##_interrupt

#define IRQLIST_16(x) \
IRQ(x,0), IRQ(x,1), IRQ(x,2), IRQ(x,3), \
IRQ(x,4), IRQ(x,5), IRQ(x,6), IRQ(x,7), \
IRQ(x,8), IRQ(x,9), IRQ(x,a), IRQ(x,b), \
IRQ(x,c), IRQ(x,d), IRQ(x,e), IRQ(x,f)

#define IRQLIST_14(x) \
IRQ(x,0), IRQ(x,1), IRQ(x,2), IRQ(x,3), \
IRQ(x,4), IRQ(x,5), IRQ(x,6), IRQ(x,7), \
IRQ(x,8), IRQ(x,9), IRQ(x,a), IRQ(x,b), \
IRQ(x,c), IRQ(x,d)

在i8259.c中中断初始化如下：

void __init init_IRQ(void)
{
int i;

/* all the set up before the call gates are initialised */
pre_intr_init_hook();

/*
* Cover the whole vector space, no vector can escape
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
  int vector = FIRST_EXTERNAL_VECTOR + i;
  if (i >= NR_IRQS)
   break;
  if (vector != SYSCALL_VECTOR)
   set_intr_gate(vector, interrupt[i]);
}

/* setup after call gates are initialised (usually add in
* the architecture specific gates)
*/
intr_init_hook();

/*
* Set the clock to HZ Hz, we already have a valid
* vector now:
*/
setup_pit_timer();

/*
* External FPU? Set up irq13 if so, for
* original braindamaged IBM FERR coupling.
*/
if (boot_cpu_data.hard_math && !cpu_has_fpu)
setup_irq(FPU_IRQ, &fpu_irq);

irq_ctx_init(smp_processor_id());
}