From: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
When the Hardware Interrupt Enable (HIE) bit is set, software cannot
change ISR. Add write guard accordingly.
Signed-off-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
---
hw/intc/xilinx_intc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/intc/xilinx_intc.c b/hw/intc/xilinx_intc.c
index 09b4453..ddedfa3 100644
--- a/hw/intc/xilinx_intc.c
+++ b/hw/intc/xilinx_intc.c
@@ -116,6 +116,11 @@ pic_write(void *opaque, hwaddr addr,
case R_CIE:
p->regs[R_IER] &= ~value; /* Atomic clear ie. */
break;
+ case R_ISR:
+ if ((p->regs[R_MER] & 2)) {
+ break;
+ }
+ /* fallthrough */
default:
if (addr < ARRAY_SIZE(p->regs))
p->regs[addr] = value;
--
1.8.3.rc1.44.gb387c77.dirty
