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Remapping of the IA64 interrupts?

Linux-ia64 White, Charles 2 participants 2 messages Oct 26, 2000

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White, Charles

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#0 lore raw

I am currently looking at an issue with the ISA interrupts, and it appears to be caused by the re-mapping of these interrupts.

From arch/ia64/kernel/irq_ia64.c
----------------------------------------
/*
* Legacy IRQ to IA-64 vector translation table. Any vector not in
* this table maps to itself (ie: irq 0x30 => IA64 vector 0x30) */

__u8 isa_irq_to_vector_map[16] = {
	/* 8259 IRQ translation, first 16 entries */
	0x60, 0x50, 0x10, 0x51, 0x52, 0x53, 0x43, 0x54,
	0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x40, 0x41
};

------------------------------------------

Why do this legacy interrupts need to be remapped on the IA64 system? What specification did these re-map values come from?

#1 lore raw

Hello,
To answer your question... the legacy interrupts need to be re-mapped since the vectors 0-15 are reserved on IA-64.
Currently I have a patch that re-maps these interrupts and the PCI interrupts via a pci_irq_to_vector interface... we will make this patch available soon. This may be a solution to the problem you are facing if you are in fact facing a collision of vectors (PCI to ISA).

Thanks
Goutham
-----Original Message-----
From: White, Charles [mailto:[email protected]]
Sent: Thursday, October 26, 2000 8:23 AM
To: '[email protected]'
Subject: [Linux-ia64] Remapping of the IA64 interrupts?

I am currently looking at an issue with the ISA interrupts, and it appears to be caused by the re-mapping of these interrupts.

From arch/ia64/kernel/irq_ia64.c
----------------------------------------
/*
* Legacy IRQ to IA-64 vector translation table. Any vector not in
* this table maps to itself (ie: irq 0x30 => IA64 vector 0x30) */

__u8 isa_irq_to_vector_map[16] = {
	/* 8259 IRQ translation, first 16 entries */
	0x60, 0x50, 0x10, 0x51, 0x52, 0x53, 0x43, 0x54,
	0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x40, 0x41
};

------------------------------------------

Why do this legacy interrupts need to be remapped on the IA64 system? What specification did these re-map values come from?

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