[英]How do I get the interrupt vector number on Linux?
When I run "cat /proc/interrupts", I can get the following:当我运行“cat /proc/interrupts”时,我可以得到以下信息:
CPU0 CPU1
0: 253 1878 IO-APIC-edge timer
1: 3 0 IO-APIC-edge i8042
7: 1 0 IO-APIC-edge parport0
8: 0 1 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 1 3 IO-APIC-edge i8042
16: 681584 60 IO-APIC-fasteoi uhci_hcd:usb3, nvidia
17: 0 0 IO-APIC-fasteoi uhci_hcd:usb4, uhci_hcd:usb7
18: 0 0 IO-APIC-fasteoi uhci_hcd:usb8
22: 2 1 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5
23: 17 17 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
44: 146232 472747 PCI-MSI-edge ahci
45: 118 115 PCI-MSI-edge snd_hda_intel
46: 10038650 842 PCI-MSI-edge eth1
NMI: 44479 43798 Non-maskable interrupts
LOC: 19025635 29426776 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 44479 43798 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RES: 3442001789 3442627214 Rescheduling interrupts
CAL: 1406 1438 Function call interrupts
TLB: 781318 792403 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 2063 2063 Machine check polls
ERR: 0
MIS: 0
How can I get the interrupt number of "NMI" "LOC" "SPU" "PMI", etc.如何获取“NMI”“LOC”“SPU”“PMI”等中断号
On x86 NMIs
are always on interrupt vector 2. The number is hard-coded just as common exceptions (division by 0, page fault, etc).在 x86 上,
NMIs
始终位于中断向量 2 上。该数字与常见异常(除以 0、页面错误等)一样是硬编码的。 You can find this in the CPU documentation from Intel/AMD.您可以在 Intel/AMD 的 CPU 文档中找到它。
If the APIC
is enabled (as is the case in the dump presented in the question), Spurious Interrupt's interrupt vector number can be obtained from APIC's SVR
register.如果
APIC
已启用(如问题中提供的转储中的情况),则可以从 APIC 的SVR
寄存器中获取虚假中断的中断向量编号。 Again, see the same CPU documentation on that.同样,请参阅相同的 CPU 文档。
If the APIC
isn't enabled and instead the PIC
is being used, then Spurious Interrupts are delivered as IRQ7
(see the 8259A
PIC chip spec for that).如果未启用
APIC
而是使用PIC
,则虚假中断将作为IRQ7
(请参阅8259A
PIC 芯片规范)。 The BIOS
programs the PIC in such a way that IRQ7 is interrupt vector 0Fh
, but Windows and Linux change this mapping to avoid sharing the same interrupt vectors for IRQs and CPU exceptions. BIOS
以 IRQ7 为中断向量0Fh
的方式对 PIC 进行编程,但 Windows 和 Linux 更改此映射以避免共享相同的 IRQ 和 CPU 异常中断向量。 It seems like this mapping can't be queried from the PIC, but it's established via sending the Initialization Control Word 2 ( ICW2
) to the PIC.似乎无法从 PIC 查询此映射,但它是通过向 PIC 发送初始化控制字 2 (
ICW2
) 来建立的。 Here's the relevant piece of Linux code in init_8259A()
:这是
init_8259A()
的相关 Linux 代码:
/* ICW2: 8259A-1 IR0-7 mapped to 0x30-0x37 on x86-64,
to 0x20-0x27 on i386 */
outb_pic(IRQ0_VECTOR, PIC_MASTER_IMR);
That should answer the Spurious Interrupt vector part.那应该回答虚假中断向量部分。
As for LOC
and PMI
, I think, these are local APIC's interrupts and you can find their interrupt vectors from the APIC just like with the Spurious Interrupt above.至于
LOC
和PMI
,我认为,这些是本地 APIC 的中断,您可以从 APIC 中找到它们的中断向量,就像上面的虚假中断一样。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.