Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
vgasrc/cbvga.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/vgasrc/cbvga.c b/vgasrc/cbvga.c
index 3f16bee10c..f6ebe71242 100644
--- a/vgasrc/cbvga.c
+++ b/vgasrc/cbvga.c
@@ -192,8 +192,16 @@ int
cbvga_set_mode(struct vgamode_s *vmode_g, int flags)
{
u8 emul = vmode_g == &CBemulinfo || GET_GLOBAL(CBmode) == 0x03;
+ /*
+ * The extra_stack flag is false when running in windows x86
+ * emulator, to avoid stack switching triggering bugs. Using the
+ * same flag here to skip screen clearing, because the windows
+ * emulator seems to have problems to handle the int 1587 call
+ * too, and GO_MEMSET uses that.
+ */
+ u8 extra_stack = GET_BDA_EXT(flags) & BF_EXTRA_STACK;
MASK_BDA_EXT(flags, BF_EMULATE_TEXT, emul ? BF_EMULATE_TEXT : 0);
- if (!(flags & MF_NOCLEARMEM)) {
+ if (!(flags & MF_NOCLEARMEM) && extra_stack) {
if (GET_GLOBAL(CBmodeinfo.memmodel) == MM_TEXT) {
memset16_far(SEG_CTEXT, (void*)0, 0x0720, 80*25*2);
return 0;
--
2.9.3
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