From f219bc7fa3add23d4fe8d989d52194c985bcd6d8 Mon Sep 17 00:00:00 2001
From: nub31 <oliverlhs@outlook.com>
Date: Fri, 22 Aug 2025 21:28:06 +0200
Subject: [PATCH] ...

---
 .clang-format        | 18 ++++++++++++++++++
 src/boot.asm         | 37 +++++++++++++++++++++++++++++++++++++
 src/kernel.c         |  5 +++++
 src/kernel_entry.asm |  5 +++++
 4 files changed, 65 insertions(+)
 create mode 100644 .clang-format
 create mode 100644 src/kernel_entry.asm

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..cb5cd48
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,18 @@
+IndentWidth: 4
+ColumnLimit: 120
+
+# Pointer formatting
+DerivePointerAlignment: false
+PointerAlignment: Left
+
+# Function formatting
+AllowShortFunctionsOnASingleLine: None
+
+# Control how short statements are placed
+AllowShortBlocksOnASingleLine: Never
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+
+SeparateDefinitionBlocks: Always
+
+BreakBeforeBraces: Allman
diff --git a/src/boot.asm b/src/boot.asm
index bc1bd27..abd5548 100644
--- a/src/boot.asm
+++ b/src/boot.asm
@@ -1,6 +1,32 @@
 [org 0x7c00]
 [bits 16]
 
+KERNEL_LOCATION equ 0x1000
+
+mov [BOOT_DISK], dl                 
+
+xor ax, ax                          
+mov es, ax
+mov ds, ax
+mov bp, 0x8000
+mov sp, bp
+
+mov bx, KERNEL_LOCATION
+mov dh, 2
+
+mov ah, 0x02
+mov al, dh 
+mov ch, 0x00
+mov dh, 0x00
+mov cl, 0x02
+mov dl, [BOOT_DISK]
+int 0x13
+
+                                    
+mov ah, 0x0
+mov al, 0x3
+int 0x10
+
 CODE_SEG equ gdt_code - gdt_start
 
 cli
@@ -40,6 +66,17 @@ gdt_descriptor:
 
 [bits 32]
 start_protected_mode:
+    mov ax, DATA_SEG
+	mov ds, ax
+	mov ss, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	
+	mov ebp, 0x90000
+	mov esp, ebp
+
+    jmp KERNEL_LOCATION
     jmp $
 
 
diff --git a/src/kernel.c b/src/kernel.c
index e69de29..9b6317e 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -0,0 +1,5 @@
+int main(void)
+{
+    *(char*)0xb8000 = 'A';
+    return 0;
+}
\ No newline at end of file
diff --git a/src/kernel_entry.asm b/src/kernel_entry.asm
new file mode 100644
index 0000000..7992f82
--- /dev/null
+++ b/src/kernel_entry.asm
@@ -0,0 +1,5 @@
+section .text
+    [bits 32]
+    [extern main]
+    call main
+    jmp $
\ No newline at end of file