busybox version

.gitignore

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+/initrd/
+/initrd.img

create.sh

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+#!/bin/bash
+
+# LEdoian's absurdly simple initrd generator (benchmark arc)
+
+set -eu
+
+mkdir "initrd"
+cp "./init" "initrd/"
+
+busybox="$(which busybox)"
+cp "$busybox" "initrd/busybox"
+
+pushd "./initrd"
+find . | cpio -o -H newc > ../initrd.img
+popd

init

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+#!/busybox ash
+/busybox poweroff -f

run.sh

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+#!/bin/bash
+
+set -eu
+
+arch=x86_64
+kernel=/boot/vmlinuz-linux
+time qemu-system-"$arch" -m 100M -net none -kernel "$kernel" -initrd "./initrd.img" -serial none -vga none -display none "$@"