Messages in this thread | | | From | Anil Kumar S R <> | Subject | Interrupt Handling | Date | Mon, 2 Aug 1999 13:56:10 +0530 |
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Hi, I have some queries regarding Interrupt handling in serial.c
1.I find that a macro called CONFIG_SERIAL_SHARE_IRQ is used for sharing Interrupts. If this is set then serial.c can be used for shared interrupts. But I checked in arch/i386/kernel/irq.c the function set_x86_irq tells that sharing can happen If we set flag to SA_SHIRQ Without this being set the interrupt is being shared by two modems using serial.c How is this possible?
2.If the flag is set to fast interrupt(SA_INTERRUPT) will I be able to have shared interrupts. Should I set the flag to slow and do sharing of interrupts.
3.And what is significance of dev_id in sharing of interrupts? As in free_irq function based on dev_id the interrupt is shared.
4.By sharing of interrupts the machine is slow . will this happen due to sharing? If so how to overcome this.
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