MIPS assembly to determine whether hardware I/O interrupt has occurred? -

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in mips32 exception handler, want determine whether exception caused i/o interrupt. cause register bits 2-6 inclusive has checked. what's mips assembly code determine this?

you have mask out each bit check interrupt came from. exception handler procedure shown here: exchandler http://i47.tinypic.com/5yt47c.png can see manual hardware says interrupt came , theres error codes u can load register , compare epie register see if exception trap or interrupt, remember reset epie (error status register) before return error , enable interrupt bits in processors control register allow hardware make interrupts.

this scheme used when coding exception handler nios ii, procedure should similar mips32.

mips assembly language, mips: interrupts , exceptions page 22


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