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原帖由 rt77789 于 2009-1-20 10:55 发表 ![]()
rt
在内核源代码中的arch/i386/kernel/traps.c中的trap_init()函数
set_trap_gate(0,÷_error);
set_intr_gate(1,&debug);
set_intr_gate(2,&nmi);
set_system_intr_gate(3, &int3); /* int3/4 can be called from all */
set_system_gate(4,&overflow);
set_trap_gate(5,&bounds);
set_trap_gate(6,&invalid_op);
set_trap_gate(7,&device_not_available);
set_task_gate(8,GDT_ENTRY_DOUBLEFAULT_TSS);
set_trap_gate(9,&coprocessor_segment_overrun);
set_trap_gate(10,&invalid_TSS);
set_trap_gate(11,&segment_not_present);
set_trap_gate(12,&stack_segment);
set_trap_gate(13,&general_protection);
set_intr_gate(14,&page_fault);
set_trap_gate(15,&spurious_interrupt_bug);
set_trap_gate(16,&coprocessor_error);
set_trap_gate(17,&alignment_check);
#ifdef CONFIG_X86_MCE
set_trap_gate(18,&machine_check);
#endif
set_trap_gate(19,&simd_coprocessor_error);
/*
* Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
* Generate a build-time error if the alignment is wrong.
*/
BUILD_BUG_ON(offsetof(struct task_struct, thread.i387.fxsave) & 15);
if (cpu_has_fxsr) {
printk(KERN_INFO "Enabling fast FPU save and restore... ");
set_in_cr4(X86_CR4_OSFXSR);
printk("done.\n");
}
if (cpu_has_xmm) {
printk(KERN_INFO "Enabling unmasked SIMD FPU exception "
"support... ");
set_in_cr4(X86_CR4_OSXMMEXCPT);
printk("done.\n");
}
set_system_gate(SYSCALL_VECTOR,&system_call); //这个地方就是系统调用
对于其它使用request_irq注册的中断,可以在/proc/interrupts中找到。那里面的0就相当于中断向量的32 |
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