Explicitly enable hardware cursorkeyboard-support

Required for virtualbox

3 files changed, 20 insertions, 9 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;
diff --git a/kernel/gpu/text_mode/display.h b/kernel/gpu/text_mode/display.h
index f4f3724..fec3314 100644
--- a/kernel/gpu/text_mode/display.h
+++ b/kernel/gpu/text_mode/display.h
@@ -1,3 +1,4 @@
+void scrn_enable_cursor(unsigned char start_line, unsigned char end_line);
 void scrn_clear();
 void scrn_print(char *msg);
 void scrn_println(char *msg);
diff --git a/kernel/kernel.c b/kernel/kernel.c
index a6540f5..7f702e7 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -5,10 +5,10 @@
 
 void run_kern_demo()
 {
-  
+  scrn_enable_cursor(10, 12);
   scrn_clear();
   scrn_set_text_colour(COLOUR_LIGHT_GREEN, COLOUR_BLACK);
-  
+
   scrn_println("  _   _              ____   _____ ");
   scrn_println(" | | (_)            / __ \\ / ____|");
   scrn_println(" | |_ _ _ __  _   _| |  | | (___  ");