From 3a05ccd994e18581e343880ef2390b784c4e5ed6 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Tue, 11 Apr 2017 09:01:14 +0200
Subject: [PATCH] Add multiboot header and boot.asm

---
 src/arch/x86_64/boot.asm             |  8 ++++++++
 src/arch/x86_64/multiboot_header.asm | 15 +++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 src/arch/x86_64/boot.asm
 create mode 100644 src/arch/x86_64/multiboot_header.asm

diff --git a/src/arch/x86_64/boot.asm b/src/arch/x86_64/boot.asm
new file mode 100644
index 0000000..1a531c0
--- /dev/null
+++ b/src/arch/x86_64/boot.asm
@@ -0,0 +1,8 @@
+global start
+
+section .text
+bits 32
+start:
+    ; print `OK` to screen
+    mov dword [0xb8000], 0x2f4b2f4f
+    hlt
diff --git a/src/arch/x86_64/multiboot_header.asm b/src/arch/x86_64/multiboot_header.asm
new file mode 100644
index 0000000..9a9289c
--- /dev/null
+++ b/src/arch/x86_64/multiboot_header.asm
@@ -0,0 +1,15 @@
+section .multiboot_header
+header_start:
+    dd 0xe85250d6                ; magic number (multiboot 2)
+    dd 0                         ; architecture 0 (protected mode i386)
+    dd header_end - header_start ; header length
+    ; checksum
+    dd 0x100000000 - (0xe85250d6 + 0 + (header_end - header_start))
+
+    ; insert optional multiboot tags here
+
+    ; required end tag
+    dw 0    ; type
+    dw 0    ; flags
+    dd 8    ; size
+header_end: