fiq & irq handler — arm

Question

I am new to arm & have some doubs related to IRQ & FIQ. Please try to clarify these.
How many number of FIQ & IRQ channel arm have ?
And what number of h

Answer 1

traditionally the arm has one interrupt line which you can send to one of two handlers FIQ or IRQ. FIQ has a larger bank of FIQ mode only registers so you have fewer that you need to store on the stack. From there you read the vendor specific registers if any to determine the source of the interrupt and then branch into separate handlers.

More recently there have bend arm architectures with many interrupts 128, 256 each with a separate handler. So generically asking about arm is not as varied but about like asking something generic about x86.

All of this information is easily available in the ARM architectural reference manuals for the different architectures and the pinouts to the core (what the vendor builds its chip around) is documented in the technical reference manuals for the various cores (also very easy to obtain). infocenter.arm.com has the architecture and technical reference manuals as well as amba/axi (the data bus that the vendor connects to). Your question is completely answered in those documents.