From 5b86e31087f6261dca28bb8c51a7a595998cc1d1 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Thu, 24 Oct 2019 19:12:49 +0200
Subject: Add error section and init stack

---
 kernel/src/boot.asm | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/kernel/src/boot.asm b/kernel/src/boot.asm
index 839457e..a10b14c 100644
--- a/kernel/src/boot.asm
+++ b/kernel/src/boot.asm
@@ -3,6 +3,22 @@ global start
 section .text
 bits 32
 start:
+	mov esp, stack_top
+
 	; print 'OK'
 	mov dword [0xb8000], 0x2f4b2f4f
 	hlt
+
+; Prints 'ERR: ' and the given error code to the screen and halts
+; parameter: error code letter (ascii) in al
+error:
+	mov dword [0xb8000], 0x4f524f45
+	mov dword [0xb8004], 0x4f3a4f52
+	mov dword [0xb8008], 0x4f504f20
+	mov byte  [0xb800a], al
+	hlt
+
+section .bss
+stack_bottom:
+	resb 64
+stack_top:
-- 
cgit v1.2.3-70-g09d2