rushmore-linux

3 files changed, 62 insertions, 0 deletions

diff --git a/rushmore-linux/rl.sh b/rushmore-linux/rl.sh
new file mode 100755
index 0000000..2f7ecae
--- /dev/null
+++ b/rushmore-linux/rl.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -euo pipefail
+
+ROOT="$(dirname "$0")"
+BUILD_DIR="$ROOT/build"
+ROOTFS_DIR="$ROOT/rootfs"
+
+mkdir -p "$BUILD_DIR"
+mkdir -p "$ROOTFS_DIR/proc" "$ROOTFS_DIR/sys" "$ROOTFS_DIR/dev"
+
+echo "Compiling rlinit"
+musl-gcc -static -O2 -s rlinit/rlinit.c -o "$BUILD_DIR/init"
+
+echo "Compiling rlwsd"
+musl-gcc -static -O2 -s rlwsd/rlwsd.c -o "$BUILD_DIR/rlwsd"
+
+echo "Building rootfs"
+cp "$BUILD_DIR/init" "$ROOTFS_DIR/init"
+cp "$BUILD_DIR/rlwsd" "$ROOTFS_DIR/rlwsd"
+
+echo "Building initramfs"
+(cd "$ROOTFS_DIR" && find . -print0 | cpio --null -ov --format=newc) > "$BUILD_DIR/initramfs.cpio"
+
+echo "Running QEMU (do CTRL+A then X to quit)"
+sleep 1
+qemu-system-x86_64 -kernel linux/arch/x86/boot/bzImage -initrd "$BUILD_DIR/initramfs.cpio" -append "console=ttyS0" -nographic
\ No newline at end of file
diff --git a/rushmore-linux/rlinit/rlinit.c b/rushmore-linux/rlinit/rlinit.c
new file mode 100644
index 0000000..21cf2af
--- /dev/null
+++ b/rushmore-linux/rlinit/rlinit.c
@@ -0,0 +1,24 @@
+#include <unistd.h>
+#include <sys/mount.h>
+#include <sys/wait.h>
+
+int main(void)
+{
+    mount("proc", "/proc", "proc", 0, 0);
+    mount("sysfs", "/sys", "sysfs", 0, 0);
+    mount("devtmpfs", "/dev", "devtmpfs", 0, 0);
+
+    write(1, "rlinit: starting rlwsd\n", 23);
+
+    pid_t pid = fork();
+    if (pid == 0) {
+        char *argv[] = { (char*)"/rlwsd", 0 };
+        execv(argv[0], argv);
+        _exit(127);
+    }
+
+    int st = 0;
+    waitpid(pid, &st, 0);
+    write(1, "rlinit: rlwsd exited\n", 21);
+    for (;;) pause();
+}
diff --git a/rushmore-linux/rlwsd/rlwsd.c b/rushmore-linux/rlwsd/rlwsd.c
new file mode 100644
index 0000000..94ebd87
--- /dev/null
+++ b/rushmore-linux/rlwsd/rlwsd.c
@@ -0,0 +1,11 @@
+#include <unistd.h>
+
+int main(void)
+{
+	const char* msg = "[rlwsd] HELLO!\n";
+	write(1, msg, __builtin_strlen(msg));
+	for (;;)
+	{
+		pause();
+	}
+}