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cbvga_set_mode: refine clear display logic 

There is no need to skip text mode clearing.
Clearing the framebuffer should be safe on legacy calls too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2018-06-22 08:43:04 +02:00
parent d9a8b867a3
commit 69ea6dabeb
1 changed files with 10 additions and 8 deletions
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18
vgasrc/cbvga.c
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@ -201,18 +201,20 @@ cbvga_set_mode(struct vgamode_s *vmode_g, int flags)
*/
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) && extra_stack) {
if (!(flags & MF_NOCLEARMEM)) {
if (GET_GLOBAL(CBmodeinfo.memmodel) == MM_TEXT) {
memset16_far(SEG_CTEXT, (void*)0, 0x0720, 80*25*2);
return 0;
}
struct gfx_op op;
init_gfx_op(&op, &CBmodeinfo);
op.x = op.y = 0;
op.xlen = GET_GLOBAL(CBmodeinfo.width);
op.ylen = GET_GLOBAL(CBmodeinfo.height);
op.op = GO_MEMSET;
handle_gfx_op(&op);
if (extra_stack || flags & MF_LEGACY) {
struct gfx_op op;
init_gfx_op(&op, &CBmodeinfo);
op.x = op.y = 0;
op.xlen = GET_GLOBAL(CBmodeinfo.width);
op.ylen = GET_GLOBAL(CBmodeinfo.height);
op.op = GO_MEMSET;
handle_gfx_op(&op);
}
}
return 0;
}