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pci: introduce pci_swizzle_map_irq_fn() for standardized interrupt pin swizzle

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Introduce pci_swizzle_map_irq_fn() for interrupt pin swizzle which is
standardized. PCI bridge swizzle is common logic, by introducing
this function duplicated swizzle logic will be avoided later.

[jbaron@redhat.com: drop opaque argument]
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Isaku Yamahata 2012-10-19 16:43:28 -04:00 • committed by Michael S. Tsirkin
parent 9e38f56183
commit 91e5615984
2 changed files with 20 additions and 0 deletions
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18
hw/pci.c
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@ -1155,6 +1155,24 @@ void pci_device_set_intx_routing_notifier(PCIDevice *dev,
dev->intx_routing_notifier = notifier;
}
/*
* PCI-to-PCI bridge specification
* 9.1: Interrupt routing. Table 9-1
*
* the PCI Express Base Specification, Revision 2.1
* 2.2.8.1: INTx interrutp signaling - Rules
* the Implementation Note
* Table 2-20
*/
/*
* 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD
* 0-origin unlike PCI interrupt pin register.
*/
int pci_swizzle_map_irq_fn(PCIDevice *pci_dev, int pin)
{
return (pin + PCI_SLOT(pci_dev->devfn)) % PCI_NUM_PINS;
}
/***********************************************************/
/* monitor info on PCI */