From 9a2d5cbdc7972d1d5bfb1ea93f82f66d113faa17 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 7 Jul 2021 19:13:11 +0200
Subject: Strange implementations

---
 example/mb1/main.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'example/mb1')

diff --git a/example/mb1/main.c b/example/mb1/main.c
index 0174803..d572977 100644
--- a/example/mb1/main.c
+++ b/example/mb1/main.c
@@ -1,6 +1,16 @@
 // MIT License, Copyright (c) 2021 Marvin Borner
 
 typedef unsigned int u32;
+typedef unsigned short u16;
+typedef unsigned char u8;
+
+static void draw(u8 color, u8 data)
+{
+	u16 *out = (u16 *)0xb8000;
+	for (u16 i = 0; i < 80 * 25; i++) {
+		out[i] = data | (color << 8);
+	}
+}
 
 int kernel_main(u32 magic, u32 addr, u32 esp); // Decl
 int kernel_main(u32 magic, u32 addr, u32 esp)
@@ -9,6 +19,11 @@ int kernel_main(u32 magic, u32 addr, u32 esp)
 	(void)addr;
 	(void)esp;
 
+	if (magic == 0x2badb002)
+		draw(0x02, 'y');
+	else
+		draw(0x04, 'n');
+
 	while (1)
 		;
 
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