From 0d66c59676061c09450500fa8392bfd883823d2c Mon Sep 17 00:00:00 2001
From: Pavel 'LEdoian' Turinsky <ledoian@matfyz.cz>
Date: Thu, 27 Feb 2025 02:03:07 +0100
Subject: [PATCH] busybox version

---
 .gitignore |  2 ++
 create.sh  | 15 +++++++++++++++
 init       |  2 ++
 run.sh     |  7 +++++++
 4 files changed, 26 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 create.sh
 create mode 100755 init
 create mode 100755 run.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d3b8d86
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/initrd/
+/initrd.img
diff --git a/create.sh b/create.sh
new file mode 100755
index 0000000..8e656db
--- /dev/null
+++ b/create.sh
@@ -0,0 +1,15 @@
+#!/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
diff --git a/init b/init
new file mode 100755
index 0000000..56d8cc1
--- /dev/null
+++ b/init
@@ -0,0 +1,2 @@
+#!/busybox ash
+/busybox poweroff -f
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..44a3630
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,7 @@
+#!/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 "$@"