From 06606fef1127717d031eea6b519cc6e43e715394 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Tue, 5 May 2020 17:27:45 +0200
Subject: done

---
 01_exercise/bootloader.c | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/01_exercise/bootloader.c b/01_exercise/bootloader.c
index bc7d807..afd4d96 100644
--- a/01_exercise/bootloader.c
+++ b/01_exercise/bootloader.c
@@ -60,9 +60,42 @@ void sleep(short ms) {
 }
 
 void main(void) {
-    print("Hello!");
-    print("\n\r > ");
+    print("Hello!\n\r");
     while (1) {
-        putc(getc());
+        char buf[9];
+        for (unsigned char i = 0; i < 8; i++) {
+            char c = getc();
+            if (c == '\r') {
+                if (i == 0) { // empty entry
+                    print("Reboot!");
+                    /*asm volatile(
+                        "mov $0x5307, %%ax;" // TURN OFF SYSTEM:
+                                             // http://www.ctyme.com/intr/rb-1356.htm
+                        "mov $0x0001, %%bx;"
+                        "mov $0x0003, %%cx;"
+                        "int $0x15" ::
+                            : "ax", "bx", "cx");*/
+                    asm volatile("xor %%eax, %%eax\n"
+                                 "push %%eax\n"
+                                 "push %%ax\n"
+                                 "lidt (%%esp)\n"
+                                 "mov %%ss, %%eax" ::
+                                     : "eax");
+                    return;
+                } else {
+                    break;
+                }
+            }
+            buf[i] = c;
+            putc('*');
+        }
+        buf[8] = '\0';
+        while (1) {
+            if (getc() == '\r')
+                break;
+        }
+        print("\n\r");
+        print(buf);
+        print("\n\r");
     }
 }
\ No newline at end of file
-- 
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