diff options
Diffstat (limited to 'vgasrc/stdvga.c')
| -rw-r--r-- | vgasrc/stdvga.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c index 4bfa101a..afe26dbd 100644 --- a/vgasrc/stdvga.c +++ b/vgasrc/stdvga.c @@ -286,6 +286,17 @@ stdvga_get_vertical_size(void) return vde + 1; } +// Set vertical screen size (number of horizontal lines in the display) +void +stdvga_set_vertical_size(int lines) +{ + u16 crtc_addr = stdvga_get_crtc(); + u16 vde = lines - 1; + stdvga_crtc_write(crtc_addr, 0x12, vde); + u8 ovl = ((vde >> 7) & 0x02) + ((vde >> 3) & 0x40); + stdvga_crtc_mask(crtc_addr, 0x07, 0x42, ovl); +} + // Get offset into framebuffer accessible from real-mode 64K segment int stdvga_get_window(struct vgamode_s *curmode_g, int window) |