如何配置ioapic以接收键盘中断？

问题描述

我正在为x86编写内核。

启用快速计时器后，我尝试启用键盘中断。

这些是我要完成的步骤

• 启用lapic
• 禁用图片（即outb(io_pic1 + 1,0xff)和outb(io_pic2 + 1,0xff)
• 初始化碘化
• 为irq_kbd (0x21)启用ioapic
• 准备IDT和ISR

实际上，如果我手动运行异常指令（int），它将跳转到适当的ISR。

但是，我无法使操作系统接收键盘输入（我正在使用QEMU）。

有什么我想念的吗？

以下是通过QEMU监视器获取的图片和寄存器的快照

QEMU 5.0.0 monitor - type 'help' for more information
(qemu) info pic
pic0: irr=15 imr=ff isr=00 hprio=0 irq_base=08 rr_sel=0 elcr=00 fnm=0
pic1: irr=40 imr=ff isr=00 hprio=0 irq_base=70 rr_sel=0 elcr=0c fnm=0
ioapic0: ver=0x20 id=0x00 sel=0x13 (redir[1])
  pin 0  0x0000000000010020 dest=0 vec=32  active-hi edge  masked fixed  physical
  pin 1  0x0000000000000021 dest=0 vec=33  active-hi edge         fixed  physical
  pin 2  0x0000000000010022 dest=0 vec=34  active-hi edge  masked fixed  physical
  pin 3  0x0000000000010023 dest=0 vec=35  active-hi edge  masked fixed  physical
  pin 4  0x0000000000010024 dest=0 vec=36  active-hi edge  masked fixed  physical
  pin 5  0x0000000000010025 dest=0 vec=37  active-hi edge  masked fixed  physical
  pin 6  0x0000000000010026 dest=0 vec=38  active-hi edge  masked fixed  physical
  pin 7  0x0000000000010027 dest=0 vec=39  active-hi edge  masked fixed  physical
  pin 8  0x0000000000010028 dest=0 vec=40  active-hi edge  masked fixed  physical
  pin 9  0x0000000000010029 dest=0 vec=41  active-hi edge  masked fixed  physical
  pin 10 0x000000000001002a dest=0 vec=42  active-hi edge  masked fixed  physical
  pin 11 0x000000000001002b dest=0 vec=43  active-hi edge  masked fixed  physical
  pin 12 0x000000000001002c dest=0 vec=44  active-hi edge  masked fixed  physical
  pin 13 0x000000000001002d dest=0 vec=45  active-hi edge  masked fixed  physical
  pin 14 0x000000000001002e dest=0 vec=46  active-hi edge  masked fixed  physical
  pin 15 0x000000000001002f dest=0 vec=47  active-hi edge  masked fixed  physical
  pin 16 0x0000000000010030 dest=0 vec=48  active-hi edge  masked fixed  physical
  pin 17 0x0000000000010031 dest=0 vec=49  active-hi edge  masked fixed  physical
  pin 18 0x0000000000010032 dest=0 vec=50  active-hi edge  masked fixed  physical
  pin 19 0x0000000000010033 dest=0 vec=51  active-hi edge  masked fixed  physical
  pin 20 0x0000000000010034 dest=0 vec=52  active-hi edge  masked fixed  physical
  pin 21 0x0000000000010035 dest=0 vec=53  active-hi edge  masked fixed  physical
  pin 22 0x0000000000010036 dest=0 vec=54  active-hi edge  masked fixed  physical
  pin 23 0x0000000000010037 dest=0 vec=55  active-hi edge  masked fixed  physical
  IRR      (none)
  Remote IRR (none)
(qemu) info registers                                                                                                                                                                                              
EAX=00000002 EBX=0100a80d ECX=39838896 EDX=00000000                                                                                                                                                                
ESI=00000002 EDI=00000010 EBP=00007bf8 ESP=0210dc68                                                                                                                                                                
EIP=010048ce EFL=00000212 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0                                                                                                                                                   
ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]                                                                                                                                                               
CS =0008 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]                                                                                                                                                               
SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]                                                                                                                                                               
DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]                                                                                                                                                               
FS =0000 00000000 00000000 00000000                                                                                                                                                                                
GS =0000 00000000 00000000 00000000                                                                                                                                                                                
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT                                                                                                                                                                      
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy                                                                                                                                                               
GDT=     0210a1a0 0000002f                                                                                                                                                                                         
IDT=     0210a200 000007ff                                                                                                                                                                                         
CR0=80010011 CR2=00000000 CR3=02001000 CR4=00000010                                                                                                                                                                
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000                                                                                                                                                                
DR6=ffff0ff0 DR7=00000400                                                                                                                                                                                          
EFER=0000000000000000                                                                                                                                                                                              
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80                                                                                                                                                                     
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
[...]                                                                                                                                                           

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