On Fri, Mar 2, 2012 at 11:12 PM, ���f任 <che...@iis.sinica.edu.tw> wrote: >> Can anyone explain their relationship and difference among them? It >> is very appreciated if you can make some comments. thanks. > > I think IRQ number, interrupt number are quite similar things. You can > check PIC [1] first, especially 8259A [2]. When a device raise an interrupt, > the interrupt is delivered to CPU through PIC. Each device attaches itself > to one of PIC's pins. Thus, when we say the IRQ number of device X is Y, > it means device X attaches itself to PIC's pin Y. PIC will deliver the highest > priority interrupt to the CPU. The term "interrupt line" might appear in PCI > context [3]. BIOS usually uses interrupt line to represent what PIC pin the > device attatches to. Note that PIC (Programmable Interrupt Controller) and > PCI (Peripheral Component Interconnect) are different things. > > GPIO mostly is used on SoC. It depends on the vendor how to use GPIO. One > of GPIO capabilities is similar to PIC, I guess. But I leave this to SoC > experts. I strongly recommend the book [5] if you want to learn how things > work. thanks a lot for your help, they are very in theory.:). actually these concepts all exist in QEMU. I would like to know how they work together. > > HTH, > chenwj > > [1] http://en.wikipedia.org/wiki/Programmable_Interrupt_Controller > [2] http://en.wikipedia.org/wiki/Intel_8259 > [3] http://en.wikipedia.org/wiki/Conventional_PCI > [4] http://en.wikipedia.org/wiki/General_Purpose_Input/Output > [5] 系统虚拟化:原理与实现 > > -- > Wei-Ren Chen (���f任) > Computer Systems Lab, Institute of Information Science, > Academia Sinica, Taiwan (R.O.C.) > Tel:886-2-2788-3799 #1667 > Homepage: http://people.cs.nctu.edu.tw/~chenwj
-- Regards, Zhi Yong Wu
