From 0c7707f293cc4d59763ed06a1d17c8599f180aa9 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Mon, 8 Apr 2024 22:59:59 -0400 Subject: kernel: Add device descriptors Signed-off-by: Ian Moffett --- 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 +#include +#include + +#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 +#include +#include +#include +#include + +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; +} -- cgit v1.2.3