From 0c7707f293cc4d59763ed06a1d17c8599f180aa9 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 8 Apr 2024 22:59:59 -0400
Subject: kernel: Add device descriptors
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/include/sys/device.h | 50 ++++++++++++++++++++++++++++
sys/kern/kern_device.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 134 insertions(+)
create mode 100644 sys/include/sys/device.h
create mode 100644 sys/kern/kern_device.c
(limited to 'sys')
diff --git a/sys/include/sys/device.h b/sys/include/sys/device.h
new file mode 100644
index 0000000..0dd1744
--- /dev/null
+++ b/sys/include/sys/device.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_DEVICE_H_
+#define _SYS_DEVICE_H_
+
+#include <sys/sio.h>
+#include <sys/queue.h>
+#include <vm/dynalloc.h>
+
+#define DEVICE_ALLOC() dynalloc(sizeof(struct device))
+
+struct device {
+ dev_t major, minor;
+ int(*write)(struct device *dev, struct sio_txn *sio);
+ int(*read)(struct device *dev, struct sio_txn *sio);
+ TAILQ_ENTRY(device) link;
+};
+
+struct device *device_fetch(dev_t major, dev_t minor);
+dev_t device_alloc_major(void);
+dev_t create_dev(struct device *dev, dev_t major, dev_t minor);
+
+#endif
diff --git a/sys/kern/kern_device.c b/sys/kern/kern_device.c
new file mode 100644
index 0000000..cb9a6a1
--- /dev/null
+++ b/sys/kern/kern_device.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/device.h>
+#include <sys/queue.h>
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/spinlock.h>
+
+static TAILQ_HEAD(, device) devices;
+static struct spinlock devices_lock = {0};
+static bool device_list_init = false;
+
+dev_t
+device_alloc_major(void)
+{
+ static dev_t major = 1;
+ return major++;
+}
+
+struct device *
+device_fetch(dev_t major, dev_t minor)
+{
+ struct device *dev;
+
+ TAILQ_FOREACH(dev, &devices, link) {
+ if (dev->major == major && dev->minor == minor) {
+ return dev;
+ }
+ }
+
+ return NULL;
+}
+
+dev_t
+create_dev(struct device *dev, dev_t major, dev_t minor)
+{
+ if (dev == NULL || minor == 0) {
+ return -EINVAL;
+ }
+
+ if (major == 0) {
+ return -EINVAL;
+ }
+
+ if (!device_list_init) {
+ TAILQ_INIT(&devices);
+ device_list_init = true;
+ }
+
+ dev->major = major;
+ dev->minor = minor;
+
+ spinlock_acquire(&devices_lock);
+ TAILQ_INSERT_HEAD(&devices, dev, link);
+ spinlock_release(&devices_lock);
+ return dev->major;
+}
--
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