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回复 1# chishanmingshen
pci spec 3.0:
Interrupt Line
The Interrupt Line register is an eight-bit register used to communicate interrupt line routing
information. The register is read/write and must be implemented by any device (or device
function) that uses an interrupt pin. POST software will write the routing information into
this register as it initializes and configures the system.
The value in this register tells which input of the system interrupt controller(s) the device's
interrupt pin is connected to. The device itself does not use this value, rather it is used by
device drivers and operating systems. Device drivers and operating systems can use this
information to determine priority and vector information. Values in this register are system
architecture specific
http://wiki.osdev.org/PCI
Interrupt Line: Specifies which input of the system interrupt controllers the device's interrupt pin is connected to and is implemented by any device that makes use of an interrupt pin. For the x86 architecture this register corresponds to the PIC IRQ numbers 0-15 (and not I/O APIC IRQ numbers) and a value of 0xFF defines no connection.
pci interrupt routing的话 spec举例但是可能还是很难懂,你可以看看:
http://www.openwatcom.org/index.php/PCI_Interrupt_Routing
这个说的比较详细! |
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