From b83b28b21571f9b1fadd251295f5ca03d9dfedc7 Mon Sep 17 00:00:00 2001
From: Xander <xander@icth.xyz>
Date: Wed, 28 Jun 2023 17:20:46 +0200
Subject: Booting to protected mode

---
 src/arch/x86_64/boot.asm             |  8 ++++++++
 src/arch/x86_64/grub.cfg             |  7 +++++++
 src/arch/x86_64/linker.ld            | 16 ++++++++++++++++
 src/arch/x86_64/multiboot_header.asm | 15 +++++++++++++++
 4 files changed, 46 insertions(+)
 create mode 100644 src/arch/x86_64/boot.asm
 create mode 100644 src/arch/x86_64/grub.cfg
 create mode 100644 src/arch/x86_64/linker.ld
 create mode 100644 src/arch/x86_64/multiboot_header.asm

(limited to 'src/arch/x86_64')

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/grub.cfg b/src/arch/x86_64/grub.cfg
new file mode 100644
index 0000000..7c34c9c
--- /dev/null
+++ b/src/arch/x86_64/grub.cfg
@@ -0,0 +1,7 @@
+set timeout=0
+set default=0
+
+menuentry "ats-os" {
+    multiboot2 /boot/kernel.bin
+    boot
+}
diff --git a/src/arch/x86_64/linker.ld b/src/arch/x86_64/linker.ld
new file mode 100644
index 0000000..5d788f1
--- /dev/null
+++ b/src/arch/x86_64/linker.ld
@@ -0,0 +1,16 @@
+ENTRY(start)
+
+SECTIONS {
+    . = 1M;
+
+    .boot :
+    {
+        /* ensure that the multiboot header is at the beginning */
+        *(.multiboot_header)
+    }
+
+    .text :
+    {
+        *(.text)
+    }
+}
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:
-- 
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