Linux內核中斷之中斷向量表IDT的初始化

Linux內核中斷之中斷向量表IDT的初始化：

1. void __init trap_init(void)
2. {
3. int i;
5. #ifdef CONFIG_EISA
6. void __iomem *p = early_ioremap(0x0FFFD9, 4);
8. if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
9. EISA_bus = 1;
10. early_iounmap(p, 4);
11. #endif
13. set_intr_gate(0, ÷_error);
14. set_intr_gate_ist(2, &nmi, NMI_STACK);
15. /* int4 can be called from all */
16. set_system_intr_gate(4, &overflow);
17. set_intr_gate(5, &bounds);
18. set_intr_gate(6, &invalid_op);
19. set_intr_gate(7, &device_not_available);
20. #ifdef CONFIG_X86_32
21. set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
22. #else
23. set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK);
24. #endif
25. set_intr_gate(9, &coprocessor_segment_overrun);
26. set_intr_gate(10, &invalid_TSS);
27. set_intr_gate(11, &segment_not_present);
28. set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK);
29. set_intr_gate(13, &general_protection);
30. set_intr_gate(15, &spurious_interrupt_bug);
31. set_intr_gate(16, &coprocessor_error);
32. set_intr_gate(17, &alignment_check);
33. #ifdef CONFIG_X86_MCE
34. set_intr_gate_ist(18, &machine_check, MCE_STACK);
35. #endif
36. set_intr_gate(19, &simd_coprocessor_error);
38. /* Reserve all the builtin and the syscall vector: */
39. for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
40. set_bit(i, used_vectors);
42. #ifdef CONFIG_IA32_EMULATION
43. set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
44. set_bit(IA32_SYSCALL_VECTOR, used_vectors);
45. #endif
47. #ifdef CONFIG_X86_32
48. set_system_trap_gate(SYSCALL_VECTOR, &system_call);
49. set_bit(SYSCALL_VECTOR, used_vectors);
50. #endif
52. /*
53. * Should be a barrier for any external CPU state:
54. */
55. cpu_init();
57. x86_init.irqs.trap_init(); //這個是什麼意思呢？
58. }