add reset

arch/textwindow.cc

@@ -61,6 +61,8 @@ void TextWindow::print(const char* str, size_t length, CGA::Attribute attrib) {
 }
 
 void TextWindow::reset(char character, CGA::Attribute attrib) {
-  (void)character;
-  (void)attrib;
+    for(unsigned i=from_row; i<to_row; i++)
+        for(unsigned j=from_col; j<to_col; j++)
+            CGA::show(j, i, character, attrib);
+    setPos(0, 0);
 }

main.cc

@@ -21,8 +21,9 @@ extern "C" int main() {
 
   //test textwindow implemantation
   TextWindow tw = TextWindow(0, 10, 0, 10, true);
+  tw.reset();
   tw.setPos(0,0);
-  tw.print("test123", 7);
+  tw.print("lorem ipsum dolor sit amit", 26);
 
   /* Start application processors
    * To avoid unexpected behaviour, make sure that interrupts are not