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.
Cc: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Isaku Yamahata <yamah...@valinux.co.jp>
---
hw/pci.c | 18 ++++++++++++++++++
hw/pci.h | 2 ++
2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/hw/pci.c b/hw/pci.c
index 5349488..d6c5e66 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -1117,6 +1117,24 @@ static void pci_set_irq(void *opaque, int irq_num, int
level)
pci_change_irq_level(pci_dev, irq_num, change);
}
+/*
+ * 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(void *opaque, PCIDevice *pci_dev, int pin)
+{
+ return (pin + PCI_SLOT(pci_dev->devfn)) % PCI_NUM_PINS;
+}
+
/***********************************************************/
/* monitor info on PCI */
diff --git a/hw/pci.h b/hw/pci.h
index 1a08139..46b3ad3 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -235,6 +235,8 @@ PCIBus *pci_bus_new(DeviceState *parent, const char *name,
int devfn_min);
void pci_bus_irqs(PCIBus *bus, pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
void *irq_opaque, int nirq);
void pci_bus_hotplug(PCIBus *bus, pci_hotplug_fn hotplug, DeviceState *dev);
+/* 0 <= pin <= 3 0 = INTA, 1 = INTB, 2 = INTC, 3 = INTD */
+int pci_swizzle_map_irq_fn(void *opaque, PCIDevice *pci_dev, int pin);
PCIBus *pci_register_bus(DeviceState *parent, const char *name,
pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,
void *irq_opaque, int devfn_min, int nirq);
--
1.7.1.1
