From 29df4231e97885c9a90580d27f2538f083951334 Mon Sep 17 00:00:00 2001
From: Michel Heily <michelheily@gmail.com>
Date: Sat, 14 Dec 2019 15:10:37 +0200
Subject: [PATCH] Protect unused bits from being set in window flags

Former-commit-id: a618b4775de7276618dd11ace2e140d200fb066b
---
 src/core/iodev.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/iodev.rs b/src/core/iodev.rs
index 41dae65..1928c4f 100644
--- a/src/core/iodev.rs
+++ b/src/core/iodev.rs
@@ -192,10 +192,12 @@ impl Bus for IoDevices {
                 io.gpu.win1.top = top as u8;
             }
             REG_WININ => {
+                let value = value & !0xc0c0;
                 io.gpu.win0.flags = WindowFlags::from(value & 0xff);
                 io.gpu.win1.flags = WindowFlags::from(value >> 8);
             }
             REG_WINOUT => {
+                let value = value & !0xc0c0;
                 io.gpu.winout_flags = WindowFlags::from(value & 0xff);
                 io.gpu.winobj_flags = WindowFlags::from(value >> 8);
             }