From c65797d89f167747f0087fbbb0395fe45502a9c7 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Mon, 17 Aug 2015 15:06:29 +0200
Subject: [PATCH] Add an 64-bit error function

---
 src/arch/x86_64/long_mode_init.asm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/arch/x86_64/long_mode_init.asm b/src/arch/x86_64/long_mode_init.asm
index a8193beb..4640c0b1 100644
--- a/src/arch/x86_64/long_mode_init.asm
+++ b/src/arch/x86_64/long_mode_init.asm
@@ -25,3 +25,13 @@ long_mode_start:
     mov rax, 0x2f592f412f4b2f4f
     mov qword [0xb8000], rax
     hlt
+
+; Prints `ERROR: ` and the given error code to screen and hangs.
+; parameter: error code (in ascii) in al
+error:
+    mov rbx, 0x4f4f4f524f524f45
+    mov [0xb8000], rbx
+    mov rbx, 0x4f204f204f3a4f52
+    mov [0xb8008], rbx
+    mov byte [0xb800e], al
+    hlt