Building a multiboot 1 compatible executable

2017-10-24 16:04:09 +02:00
parent 0df19ec2b7
commit 39b43d825a
3 changed files with 56 additions and 0 deletions
--- a/src/kernel/boot/boot.S
+++ b/src/kernel/boot/boot.S
@@ -0,0 +1,26 @@
+#define MBOOT1_MAGIC 0x1BADB002
+#define MBOOT1_PALIGN 0x01
+#define MBOOT1_MEMINFO 0x02
+#define MBOOT1_FLAGS (MBOOT1_PALIGN | MBOOT1_MEMINFO)
+#define MBOOT1_CS -(MBOOT1_FLAGS + MBOOT1_MAGIC)
+
+.intel_syntax noprefix
+
+.section .multiboot
+.align 0x1000
+MultiBootHeader1:
+.long MBOOT1_MAGIC
+.long MBOOT1_FLAGS
+.long MBOOT1_CS
+
+.section .text
+.global _start
+.code32
+_start:
+cli
+
+// Print a red exclamation mark in top left corner
+mov eax, 0x0421
+mov short [0xB8000], ax
+// and loop infinitely
+jmp $