initial commit

Signed-off-by: Chloe M. <chloe@aptel.org>

4 files changed, 60 insertions, 0 deletions

diff --git a/boot/arch/amd64/Makefile b/boot/arch/amd64/Makefile
new file mode 100644
index 0000000..e92fecb
--- /dev/null
+++ b/boot/arch/amd64/Makefile
@@ -0,0 +1,6 @@
+.PHONY: all
+all: mbr
+
+.PHONY: mbr
+mbr:
+	cd mbr/; $(MAKE)
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