From a9dbef9185854c1b94fb79dc7cfecbe34638c65b Mon Sep 17 00:00:00 2001
From: Olivier Gayot <duskcoder@gmail.com>
Date: Sat, 10 Oct 2015 11:08:13 +0200
Subject: kfs: added the build system

it includes a startup file written in assembly, the Makefile and a ld
custom script meant to build link the kernel properly.

Signed-off-by: Olivier Gayot <duskcoder@gmail.com>
---
 Makefile   | 38 ++++++++++++++++++++++++++++++++++++++
 kfs.ld     | 15 +++++++++++++++
 src/crt0.S | 17 +++++++++++++++++
 3 files changed, 70 insertions(+)
 create mode 100644 Makefile
 create mode 100644 kfs.ld
 create mode 100644 src/crt0.S

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3ccecb1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,38 @@
+NAME            = kfs
+SRC             = $(wildcard src/*.c src/crt0.S)
+
+LDSCRIPT		= kfs.ld
+
+CPPFLAGS       +=
+LDFLAGS        += -T $(LDSCRIPT) -nostdlib -Wl,--build-id=none -m32
+CFLAGS         += -W -Wall -Wextra -std=gnu99 -g \
+				  -nostdinc -fno-builtin -fno-stack-protector -m32
+
+CC              = gcc
+
+OBJ             = $(SRC:.c=.o)
+
+all: $(NAME)
+
+$(NAME): $(OBJ) $(LDSCRIPT)
+	# TODO
+	$(CC) -o $@ $^ $(LDFLAGS)
+
+clean:
+	$(RM) $(OBJ)
+	$(RM) $(NAME)
+
+mrproper: clean
+
+distclean: mrproper
+	$(RM) $(addsuffix ~,$(SRC))
+	$(RM) $(wildcard $(addsuffix .sw*,$(addprefix .,$(SRC))))
+
+boot: all
+	$(shell qemu-system-x86_64 -kernel $(NAME) -nographic)
+
+debug: all
+	$(shell qemu-system-x86_64 -kernel $(NAME) -s -S)
+
+.PHONY: all clean mrproper distclean boot
+
diff --git a/kfs.ld b/kfs.ld
new file mode 100644
index 0000000..6527fbf
--- /dev/null
+++ b/kfs.ld
@@ -0,0 +1,15 @@
+OUTPUT_FORMAT("elf32-i386")
+OUTPUT_ARCH("i386")
+
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x100000 + SIZEOF_HEADERS;
+
+    PROVIDE(begin_text = .);
+    .text :
+    {
+        *(.multiboot) *(.text)
+    }
+}
diff --git a/src/crt0.S b/src/crt0.S
new file mode 100644
index 0000000..5116a7a
--- /dev/null
+++ b/src/crt0.S
@@ -0,0 +1,17 @@
+#define MAGIC   0x1BADB002
+#define FLAGS   0x7
+
+.section .multiboot
+    .align  4
+    .long   MAGIC
+    .long   FLAGS
+    .long   -(MAGIC + FLAGS)
+
+.section .text
+.global _start
+
+_start:
+    push %ebx
+    push %eax
+    call main
+    hlt
-- 
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