From ae526fa3375b708d4380d0227e27d32e06b40b92 Mon Sep 17 00:00:00 2001
From: "Chloe M." <chloe@aptel.org>
Date: Thu, 20 Aug 2026 05:53:55 +0000
Subject: initial commit

Signed-off-by: Chloe M. <chloe@aptel.org>
---
 boot/arch/amd64/mbr/Makefile | 16 ++++++++++++++++
 boot/arch/amd64/mbr/link.ld  | 21 +++++++++++++++++++++
 boot/arch/amd64/mbr/mbr.S    | 17 +++++++++++++++++
 3 files changed, 54 insertions(+)
 create mode 100644 boot/arch/amd64/mbr/Makefile
 create mode 100644 boot/arch/amd64/mbr/link.ld
 create mode 100644 boot/arch/amd64/mbr/mbr.S

(limited to 'boot/arch/amd64/mbr')

diff --git a/boot/arch/amd64/mbr/Makefile b/boot/arch/amd64/mbr/Makefile
new file mode 100644
index 0000000..f41e5cc
--- /dev/null
+++ b/boot/arch/amd64/mbr/Makefile
@@ -0,0 +1,16 @@
+CC = clang
+CFLAGS =				\
+	-ffreestanding		\
+	-nostdlib			\
+	-nostdinc			\
+	-mno-red-zone		\
+	-mno-sse			\
+	-mno-sse2			\
+	-target i386-unknown-elf
+
+.PHONY: all
+all: mbr
+
+.PHONY: mbr
+mbr:
+	clang -Tlink.ld $(CFLAGS) mbr.S -o $(GLOBAL_PROJECT_ROOT)/artifacts/mbr.bin
diff --git a/boot/arch/amd64/mbr/link.ld b/boot/arch/amd64/mbr/link.ld
new file mode 100644
index 0000000..6d25985
--- /dev/null
+++ b/boot/arch/amd64/mbr/link.ld
@@ -0,0 +1,21 @@
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+    . = 0x7C00;
+
+    .text : {
+        *(.text)
+    }
+
+    .data : {
+        *(.data)
+    }
+
+    .rodata : {
+        *(.rodata)
+    }
+
+    .bss : {
+        *(.bss)
+    }
+}
diff --git a/boot/arch/amd64/mbr/mbr.S b/boot/arch/amd64/mbr/mbr.S
new file mode 100644
index 0000000..e071a41
--- /dev/null
+++ b/boot/arch/amd64/mbr/mbr.S
@@ -0,0 +1,17 @@
+    .code16
+_start:
+    /* Normalize CS + other selectors */
+    ljmp $0x00,$1f
+1:  xor %ax, %ax
+    mov %ax, %ds
+    mov %ax, %ss
+    mov %ax, %es
+    mov %ax, %gs
+    mov %ax, %fs
+2:  cli
+    hlt
+    jmp 2b
+
+    .org 510
+    .byte 0x55
+    .byte 0xAA
-- 
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