pseries: Use #define for XICS base irq number

Currently the lowest "real" irq number for the XICS irq controller (as
opposed to numbers reserved for IPIs and other special purposes) is
hard coded as 16 in two places - in xics_system_init() and in spapr.c.

As well as being generally bad practice, we're going to need to change this
number soon to fit in with the in-kernel XICS implementation.  This patch
adds a #define for this number to avoid future breakage.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Ben Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 3 insertions, 2 deletions

diff --git a/hw/spapr.c b/hw/spapr.c
index ad3f0ea7fc..eafee0313d 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -801,7 +801,7 @@ static void ppc_spapr_init(QEMUMachineInitArgs *args)
 
     /* Set up Interrupt Controller */
     spapr->icp = xics_system_init(XICS_IRQS);
-    spapr->next_irq = 16;
+    spapr->next_irq = XICS_IRQ_BASE;
 
     /* Set up EPOW events infrastructure */
     spapr_events_init(spapr);
diff --git a/hw/xics.c b/hw/xics.c
index edf58339c0..b8887cd9c7 100644
--- a/hw/xics.c
+++ b/hw/xics.c
@@ -549,7 +549,7 @@ struct icp_state *xics_system_init(int nr_irqs)
 
     ics = g_malloc0(sizeof(*ics));
     ics->nr_irqs = nr_irqs;
-    ics->offset = 16;
+    ics->offset = XICS_IRQ_BASE;
     ics->irqs = g_malloc0(nr_irqs * sizeof(struct ics_irq_state));
 
     icp->ics = ics;
diff --git a/hw/xics.h b/hw/xics.h
index 6817268697..c3bf0083e2 100644
--- a/hw/xics.h
+++ b/hw/xics.h
@@ -28,6 +28,7 @@
 #define __XICS_H__
 
 #define XICS_IPI        0x2
+#define XICS_IRQ_BASE   0x10
 
 struct icp_state;