From 04104fc051d44f4f9b3328f29b4be91fa4060f34 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 28 Apr 2021 23:12:17 +0200
Subject: Started conversion to Grub (#17)

Yes, the CI won't like this.
---
 kernel/entry.asm | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 kernel/entry.asm

(limited to 'kernel/entry.asm')

diff --git a/kernel/entry.asm b/kernel/entry.asm
new file mode 100644
index 0000000..10b6b25
--- /dev/null
+++ b/kernel/entry.asm
@@ -0,0 +1,41 @@
+bits 32
+
+%define STACK_POINTER 0x00500000 ; The initial stack pointer in kernel mode
+%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 1280
+dd 1024
+dd 32
+
+global boot_entry
+extern kernel_main
+boot_entry:
+	mov esp, STACK_POINTER
+	push ebx
+	push eax
+
+	cli
+	call kernel_main
+	hlt
+	jmp $
-- 
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