diff options
Diffstat (limited to 'vgasrc/stdvga.c')
| -rw-r--r-- | vgasrc/stdvga.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c index d1841bf..0fab905 100644 --- a/vgasrc/stdvga.c +++ b/vgasrc/stdvga.c @@ -159,6 +159,20 @@ stdvga_set_text_block_specifier(u8 spec) stdvga_sequ_write(0x03, spec); } +// Enable reads and writes to the given "plane" when in planar4 mode. +void +stdvga_planar4_plane(int plane) +{ + if (plane < 0) { + // Return to default mode (read plane0, write all planes) + stdvga_sequ_write(0x02, 0x0f); + stdvga_grdc_write(0x04, 0); + } else { + stdvga_sequ_write(0x02, 1<<plane); + stdvga_grdc_write(0x04, plane); + } +} + /**************************************************************** * Font loading |