From 16ceb1a15713160b974687a3d61e0b5ffeb8ea60 Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.jung@tu-bs.de>
Date: Fri, 18 Apr 2025 21:37:16 +0200
Subject: [PATCH] cga mostly done

---
 arch/cga.cc | 5 +----
 arch/cga.h  | 2 +-
 main.cc     | 8 +++++---
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/cga.cc b/arch/cga.cc
index 355ab90..6fcda12 100644
--- a/arch/cga.cc
+++ b/arch/cga.cc
@@ -32,9 +32,6 @@ void getCursor(unsigned& abs_x, unsigned& abs_y) {
 }
 
 void show(unsigned abs_x, unsigned abs_y, char character, Attribute attrib) {
-  (void)abs_x;
-  (void)abs_y;
-  (void)character;
-  (void)attrib;
+  TEXT_BUFFER_BASE[abs_x + (COLUMNS * abs_y)] = Cell(character, attrib);
 }
 };  // namespace CGA
diff --git a/arch/cga.h b/arch/cga.h
index f9c9556..bbf3f59 100644
--- a/arch/cga.h
+++ b/arch/cga.h
@@ -136,5 +136,5 @@ struct Cell {
 
 /*! \brief Base address for linear text buffer in video memory
  */
-Cell* const TEXT_BUFFER_BASE = nullptr;
+Cell* const TEXT_BUFFER_BASE = reinterpret_cast<CGA::Cell*>(0xb8000);
 };  // namespace CGA
diff --git a/main.cc b/main.cc
index d800c67..8d79fe3 100644
--- a/main.cc
+++ b/main.cc
@@ -10,13 +10,15 @@ extern "C" int main() {
   unsigned int numCPUs = Core::count();
   DBG_VERBOSE << "Number of CPUs: " << numCPUs << endl;
 
-  CGA::setCursor(0, 0);
-
+  //test cga implemantation
+  CGA::setCursor(1, 2);
   unsigned x,y;
   CGA::getCursor(x, y);
-
   CGA::setCursor(x+1, y+1);
 
+  for(uint8_t i = 0; i < 10; i++)
+    CGA::show(i, i, i+0x30, CGA::Attribute());
+
   /* Start application processors
    * To avoid unexpected behaviour, make sure that interrupts are not
    * enabled before the APs are booted. Otherwise it might interfere with the