[Qemu-devel] [PULL 16/21] hw/intc/arm_gic: Fix group priority computation for group 1 IRQs

[Peter Maydell]

From: Luc MICHEL <address@hidden>

When determining the group priority of a group 1 IRQ, if C_CTRL.CBPR is
0, the non-secure BPR value is used. However, this value must be
incremented by one so that it matches the secure world number of
implemented priority bits (NS world has one less priority bit compared
to the Secure world).

Signed-off-by: Luc MICHEL <address@hidden>
Message-id: address@hidden
Reviewed-by: Peter Maydell <address@hidden>
[PMM: add assert, as the gicv3 code has]
Signed-off-by: Peter Maydell <address@hidden>
---
 hw/intc/arm_gic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
index 713de30..b7989d2 100644
--- a/hw/intc/arm_gic.c
+++ b/hw/intc/arm_gic.c
@@ -256,7 +256,8 @@ static int gic_get_group_priority(GICState *s, int cpu, int 
irq)
     if (gic_has_groups(s) &&
         !(s->cpu_ctlr[cpu] & GICC_CTLR_CBPR) &&
         GIC_TEST_GROUP(irq, (1 << cpu))) {
-        bpr = s->abpr[cpu];
+        bpr = s->abpr[cpu] - 1;
+        assert(bpr >= 0);
     } else {
         bpr = s->bpr[cpu];
     }
-- 
2.7.4