diff --git a/dev/common/memfiles.c b/dev/common/memfiles.c
deleted file mode 100644
index 8b13789..0000000
--- a/dev/common/memfiles.c
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/dev/common/meson.build b/dev/common/meson.build
deleted file mode 100644
index 330ae19..0000000
--- a/dev/common/meson.build
+++ /dev/null
@@ -1,3 +0,0 @@
-kernel_sources += files(
-    'memfiles.c',
-)
diff --git a/dev/meson.build b/dev/meson.build
index fde44ab..f300e7e 100644
--- a/dev/meson.build
+++ b/dev/meson.build
@@ -1,4 +1,3 @@
-subdir('common')
 subdir('block')
 subdir('dt')
 subdir('video')
diff --git a/include/zinnia/bio.h b/include/zinnia/bio.h
deleted file mode 100644
index 09d3e8f..0000000
--- a/include/zinnia/bio.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// SPDX-License-Identifier: ISC
-
-#pragma once
-
-#include <zinnia/mman.h>
-
-// TODO
-
-enum bio_type : uint8_t {
-    BLOCK_READ,
-    BLOCK_WRITE,
-};
-
-struct bio {
-    enum bio_type type;
-    uint32_t num_lbas;
-    uint64_t lba;
-};
diff --git a/include/zinnia/dpc.h b/include/zinnia/dpc.h
deleted file mode 100644
index 35a3793..0000000
--- a/include/zinnia/dpc.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: ISC
-
-#pragma once
-
-#include <zinnia/atomic.h>
-#include <zinnia/list.h>
-#include <zinnia/percpu.h>
-
-struct dpc {
-    void (*callback)(struct dpc* dpc, void* data);
-    void* data;
-    atomic_bool inserted;
-
-    list_link(struct dpc*) link;
-};
-
-void dpc_dispatch();
-
-struct dpc_percpu {};
-extern struct dpc_percpu dpc_percpu_data;
diff --git a/include/zinnia/waitq.h b/include/zinnia/waitq.h
deleted file mode 100644
index c9607ea..0000000
--- a/include/zinnia/waitq.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// SPDX-License-Identifier: ISC
-
-#pragma once
-
-#include <zinnia/atomic.h>
-#include <zinnia/sched.h>
-#include <zinnia/spin.h>
-#include <zinnia/tailq.h>
-
-// A queue of tasks waiting for an event.
-struct waitq {
-    tailq_head(_Atomic(struct task)) waiters;
-    _Atomic(bool) woken;
-};
-
-void waitq_init(struct waitq* wq);
-void waitq_wait(struct waitq* wq);
-void waitq_wake_one(struct waitq* wq);
-void waitq_wake_all(struct waitq* wq);
diff --git a/lib/dpc.c b/lib/dpc.c
deleted file mode 100644
index 8fb7e6b..0000000
--- a/lib/dpc.c
+++ /dev/null
@@ -1,3 +0,0 @@
-#include <zinnia/dpc.h>
-
-// TODO
diff --git a/lib/wait.c b/lib/wait.c
deleted file mode 100644
index 38b6b3b..0000000
--- a/lib/wait.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <zinnia/waitq.h>
-
-void waitq_init(struct waitq* wq) {
-    tailq_init(&wq->waiters);
-}
-
-void waitq_wait(struct waitq* wq) {
-    // TODO
-}
-
-void waitq_wake_one(struct waitq* wq) {
-    // TODO
-}
-
-void waitq_wake_all(struct waitq* wq) {
-    // TODO
-}