From dc9b0f067bd0b2bd5637841253e0b115c6aa8646 Mon Sep 17 00:00:00 2001
From: Alessandro Iezzi <aiezzi@alessandroiezzi.it>
Date: Tue, 21 Nov 2023 22:27:40 +0100
Subject: Initial commit

---
 Makefile          | 27 +++++++++++++++++++++++++++
 Makefile.busybox  | 13 +++++++++++++
 Makefile.linux    | 14 ++++++++++++++
 Makefile.syslinux | 22 ++++++++++++++++++++++
 qemu64.sh         |  3 +++
 5 files changed, 79 insertions(+)
 create mode 100644 Makefile
 create mode 100644 Makefile.busybox
 create mode 100644 Makefile.linux
 create mode 100644 Makefile.syslinux
 create mode 100755 qemu64.sh

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ddf7c36
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,27 @@
+KERNEL_VERSION   = 5.11.6
+BUSYBOX_VERSION  = 1.33.0
+SYSLINUX_VERSION = 6.03
+
+all: busybox linux initrd
+
+initrd:
+	@mkdir -p $@
+	@cp -R busybox-${BUSYBOX_VERSION}/_install/* initrd/
+	@rm initrd/linuxrc
+	@mkdir initrd/dev initrd/proc initrd/sys
+	@echo '#!/bin/sh' > initrd/init
+	@echo 'dmesg -n 1' >> initrd/init
+	@echo 'mount -t devtmpfs none /dev' >> initrd/init
+	@echo 'mount -t proc none /proc' >> initrd/init
+	@echo 'mount -t sysfs none /sys' >> initrd/init
+	@echo 'setsid cttyhack /bin/sh' >> initrd/init
+	@chmod +x initrd/init
+	@cd initrd && find . | cpio -R root:root -H newc -o | gzip > ../rootfs.gz
+	@echo initrd: creation is completed.
+
+clean:
+	rm -rf busybox* kernel* linux* live* *.iso syslinux* initrd* rootfs.gz
+
+include Makefile.busybox
+include Makefile.linux
+include Makefile.syslinux
diff --git a/Makefile.busybox b/Makefile.busybox
new file mode 100644
index 0000000..e137077
--- /dev/null
+++ b/Makefile.busybox
@@ -0,0 +1,13 @@
+busybox: busybox-${BUSYBOX_VERSION}/_install
+	@echo Busybox: build is completed.
+
+busybox-${BUSYBOX_VERSION}/_install: busybox-${BUSYBOX_VERSION}
+	cd busybox-${BUSYBOX_VERSION} && make distclean defconfig
+	sed -i 's|.*CONFIG_STATIC[^_].*|CONFIG_STATIC=y|' busybox-1.33.0/.config
+	cd busybox-${BUSYBOX_VERSION} && make busybox install
+
+busybox-${BUSYBOX_VERSION}: busybox.tar.bz2
+	tar xvf busybox.tar.bz2
+
+busybox.tar.bz2:
+	wget -O busybox.tar.bz2 http://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2
diff --git a/Makefile.linux b/Makefile.linux
new file mode 100644
index 0000000..55f68b4
--- /dev/null
+++ b/Makefile.linux
@@ -0,0 +1,14 @@
+linux: kernel.gz
+	@echo Linux: build is completed.
+
+linux-${KERNEL_VERSION}/arch/x86/boot/bzImage: linux-${KERNEL_VERSION}
+	@cd linux-${KERNEL_VERSION} && make HOSTCC=gcc-11 CC=gcc-11 mrproper defconfig bzImage
+
+kernel.gz: linux-${KERNEL_VERSION}/arch/x86/boot/bzImage
+	@cp linux-${KERNEL_VERSION}/arch/x86/boot/bzImage $@
+
+linux-${KERNEL_VERSION}: kernel.tar.xz
+	tar xvf kernel.tar.xz
+
+kernel.tar.xz:
+	wget -O kernel.tar.xz http://kernel.org/pub/linux/kernel/v5.x/linux-${KERNEL_VERSION}.tar.xz
diff --git a/Makefile.syslinux b/Makefile.syslinux
new file mode 100644
index 0000000..05b4f23
--- /dev/null
+++ b/Makefile.syslinux
@@ -0,0 +1,22 @@
+live-cd: syslinux-${SYSLINUX_VERSION}
+	mkdir -p live-cd
+	cp syslinux-${SYSLINUX_VERSION}/bios/core/isolinux.bin $@/
+	cp syslinux-${SYSLINUX_VERSION}/bios/com32/elflink/ldlinux/ldlinux.c32 $@/
+	echo 'default kernel.gz initrd=rootfs.gz' > $@/isolinux.cfg
+	cp kernel.gz $@/
+	cp rootfs.gz $@/
+	cd $@ && xorriso \
+		-as mkisofs \
+		-o ../alex_live.iso \
+		-b isolinux.bin \
+		-c boot.cat \
+		-no-emul-boot \
+		-boot-load-size 4 \
+		-boot-info-table \
+		./
+
+syslinux-${SYSLINUX_VERSION}: syslinux.tar.xz
+	tar xvf syslinux.tar.xz
+
+syslinux.tar.xz:
+	wget -O syslinux.tar.xz http://kernel.org/pub/linux/utils/boot/syslinux/syslinux-${SYSLINUX_VERSION}.tar.xz
diff --git a/qemu64.sh b/qemu64.sh
new file mode 100755
index 0000000..c876a1d
--- /dev/null
+++ b/qemu64.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+qemu-system-x86_64 -m 128M -cdrom alex_live.iso -boot d -vga std
\ No newline at end of file
-- 
cgit v1.2.3