From b2880945ae17ad857bd425540acd3dc75b2cff6b Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Tue, 6 Jul 2021 22:07:04 +0200
Subject: Basic multiboot 1 detection and verification

---
 example/mb1/entry.asm | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 example/mb1/entry.asm

(limited to 'example/mb1/entry.asm')

diff --git a/example/mb1/entry.asm b/example/mb1/entry.asm
new file mode 100644
index 0000000..8b8f47e
--- /dev/null
+++ b/example/mb1/entry.asm
@@ -0,0 +1,48 @@
+; MIT License, Copyright (c) 2021 Marvin Borner
+
+bits 32
+
+%define MULTIBOOT_MAGIC 0x1badb002
+%define MULTIBOOT_PAGE_ALIGN 0x1
+%define MULTIBOOT_MEMORY_INFO 0x2
+%define MULTIBOOT_VIDEO_MODE 0x4
+%define MULTIBOOT_FLAGS (MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO | MULTIBOOT_VIDEO_MODE)
+%define MULTIBOOT_CHECKSUM -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS)
+
+section .text
+align 4
+
+dd MULTIBOOT_MAGIC
+dd MULTIBOOT_FLAGS
+dd MULTIBOOT_CHECKSUM
+
+; MULTIBOOT_MEMORY_INFO
+dd 0x00000000
+dd 0x00000000
+dd 0x00000000
+dd 0x00000000
+dd 0x00000000
+
+; MULTIBOOT_VIDEO_MODE
+dd 0x00000000
+dd 1920
+dd 1200
+dd 32
+
+global boot_entry
+extern kernel_main
+boot_entry:
+	mov esp, stack_top
+	push esp
+	push ebx
+	push eax
+	cli
+	call kernel_main
+	hlt
+	jmp $
+
+section .bss
+align 32
+stack_bottom:
+	resb 0x4000
+stack_top:
-- 
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