diff options
Diffstat (limited to 'kernel/gpu/text_mode/display.c')
| -rw-r--r-- | kernel/gpu/text_mode/display.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/kernel/gpu/text_mode/display.c b/kernel/gpu/text_mode/display.c index 19074f7..bacd9df 100644 --- a/kernel/gpu/text_mode/display.c +++ b/kernel/gpu/text_mode/display.c @@ -9,15 +9,15 @@ int cursor_pos = 0; int char_attribute_byte = 0x0F; extern void write_port(unsigned short port, unsigned char data); +extern char read_port(unsigned short port); -void scrn_clear() +void scrn_enable_cursor(unsigned char start_line, unsigned char end_line) { - for (int i = 0; i < FRAME_SIZE; i = i + 2) - { - video_ram[i] = 0; - video_ram[i + 1] = char_attribute_byte; - }; - cursor_pos = 0; + write_port(0x3D4, 0x0A); + write_port(0x3D5, (read_port(0x3D5) & 0xC0) | start_line); + + write_port(0x3D4, 0x0B); + write_port(0x3D5, (read_port(0x3D5) & 0xE0) | end_line); } void scrn_update_csr() @@ -29,6 +29,16 @@ void scrn_update_csr() write_port(0x3D5, csr); } +void scrn_clear() +{ + for (int i = 0; i < FRAME_SIZE; i = i + 2) + { + video_ram[i] = 0; + video_ram[i + 1] = char_attribute_byte; + }; + cursor_pos = 0; +} + void scrn_print(char *msg) { int j = 0; |