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cbvga_set_mode: disable clearmem in windows x86 emulator. 

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2018-05-30 23:57:06 +02:00
parent 0c2b3b1d95
commit ddbb6da350
1 changed files with 9 additions and 1 deletions
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10
vgasrc/cbvga.c
View File

@ -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;