void __init native_init_IRQ(void)
{
int i;
/* Execute any quirks before the call gates are initialised: */
x86_init.irqs.pre_vector_init();
apic_intr_init();
/*
* Cover the whole vector space, no vector can escape
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
if (!test_bit(i, used_vectors))
set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
}
if (!acpi_ioapic && !of_ioapic)
setup_irq(2, &irq2);
#ifdef CONFIG_X86_32
/*
* 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());
#endif
}
void __init native_init_IRQ(void)
{
int i;
/* Execute any quirks before the call gates are initialised: */
/* 这里又是执行x86_init结构中的初始化函数，pre_vector_init()指向 init_ISA_irqs */
x86_init.irqs.pre_vector_init();
/* 初始化中断描述符表中的中断控制器中特定的一些中断门初始化 */
apic_intr_init();
/*
* Cover the whole vector space, no vector can escape
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
/* 第一个外部中断，默认是32 */
i = FIRST_EXTERNAL_VECTOR;
/* 在used_vectors变量中找出所有没有置位的中断向量，我们知道，在trap_init()中对所有异常和陷阱和系统调用中断都置位了used_vectors，没有置位的都为中断
* 这里就是对所有中断设置门描述符
*/
for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
/* interrupt[]数组保存的是外部中断的中断门信息
* 这里就是将空闲的中断设置为外部中断,interrupt是一个函数指针数组，其将31~255数组元素指向common_interrupt函数
*/
set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
}
/**
* intr_init_hook - post gate setup interrupt initialisation
*
* Description:
* Fill in any interrupts that may have been left out by the general
* init_IRQ() routine. interrupts having to do with the machine rather
* than the devices on the I/O bus (like APIC interrupts in intel MP
* systems) are started here.
**/
void __init intr_init_hook(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
apic_intr_init();
#endif
if (!acpi_ioapic)
setup_irq(2, &irq2);
}
/**
* intr_init_hook - post gate setup interrupt initialisation
*
* Description:
* Fill in any interrupts that may have been left out by the general
* init_IRQ() routine. interrupts having to do with the machine rather
* than the devices on the I/O bus (like APIC interrupts in intel MP
* systems) are started here.
**/
void __init intr_init_hook(void)
{
if (x86_quirks->arch_intr_init) {
if (x86_quirks->arch_intr_init())
return;
}
#ifdef CONFIG_X86_LOCAL_APIC
apic_intr_init();
#endif
if (!acpi_ioapic)
setup_irq(2, &irq2);
}
void __init native_init_IRQ(void)
{
int i;
/* Execute any quirks before the call gates are initialised: */
x86_init.irqs.pre_vector_init();
apic_intr_init();
/*
* Cover the whole vector space, no vector can escape
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
i = FIRST_EXTERNAL_VECTOR;
for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
}
void __init native_init_IRQ(void)
{
int i;
init_ISA_irqs();
/*
* 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 (vector != IA32_SYSCALL_VECTOR)
set_intr_gate(vector, interrupt[i]);
}
apic_intr_init();
if (!acpi_ioapic)
setup_irq(2, &irq2);
}
void __init native_init_IRQ(void)
{
int i;
/* Execute any quirks before the call gates are initialised: */
x86_init.irqs.pre_vector_init();
apic_intr_init();
/*
* Cover the whole vector space, no vector can escape
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
i = FIRST_EXTERNAL_VECTOR;
#ifndef CONFIG_X86_LOCAL_APIC
#define first_system_vector NR_VECTORS
#endif
for_each_clear_bit_from(i, used_vectors, first_system_vector) {
/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
set_intr_gate(i, irq_entries_start +
8 * (i - FIRST_EXTERNAL_VECTOR));
}
