7 files changed, 515 insertions, 0 deletions
diff --git a/mod/src/cyber.c b/mod/src/cyber.c
new file mode 100644
index 0000000..6063136
--- /dev/null
+++ b/mod/src/cyber.c
@@ -0,0 +1,29 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_device.h"
+#include "cyber_lifecycle.h"
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Felix Morgner");
+MODULE_VERSION("42.1337.1939");
+MODULE_DESCRIPTION("Add CYBER to your system");
diff --git a/mod/src/cyber_device.c b/mod/src/cyber_device.c
new file mode 100644
index 0000000..67b9695
--- /dev/null
+++ b/mod/src/cyber_device.c
@@ -0,0 +1,103 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_device.h"
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+struct cyber_device device = {};
+
+/**
+ * Initialize the sysfs CYBER device class
+ *
+ * @return zero on success, non-zero otherwise
+ */
+int cyber_device_init_device_class(void);
+
+/**
+ * Shutdown the sysfs CYBER device class
+ */
+void cyber_device_shutdown_device_class(void);
+
+/**
+ * Initialize the CYBER character device
+ *
+ * @return zero on success, non-zero otherwise
+ */
+int cyber_device_init_character_device(void);
+
+/**
+ * Shutdown the CYBER character device
+ */
+void cyber_device_shutdown_character_device(void);
+
+/**
+ * Initialize the CYBER kernel device
+ *
+ * @return zero on success, non-zero otherwise
+ */
+int cyber_device_init_kernel_device(void);
+
+/**
+ * Shutdown the CYBER kernel device
+ */
+void cyber_device_shutdown_kernel_device(void);
+
+int cyber_device_init(void)
+{
+	int error = 0;
+
+	printk(KERN_INFO DEV_NAME ": Initializing CYBER device\n");
+
+	if((error = cyber_device_init_character_device()))
+	{
+		return error;
+	}
+
+	if((error = cyber_device_init_device_class()))
+	{
+		cyber_device_shutdown_character_device();
+		return error;
+	}
+
+	if((error = cyber_device_init_kernel_device()))
+	{
+		cyber_device_shutdown_character_device();
+		cyber_device_shutdown_device_class();
+		return error;
+	}
+
+	printk(KERN_INFO DEV_NAME ": New CYBER device with major %d minor %d\n", MAJOR(device.number), MINOR(device.number));
+	return error;
+}
+
+void cyber_device_shutdown(void)
+{
+	printk(KERN_INFO DEV_NAME ": Shutting down CYBER device\n");
+	cyber_device_shutdown_kernel_device();
+	cyber_device_shutdown_device_class();
+	cyber_device_shutdown_character_device();
+}
+
+void cyber_device_release(struct device * device)
+{
+	printk(KERN_INFO DEV_NAME ": Closing kernel CYBER device\n");
+}
diff --git a/mod/src/cyber_device_character_device.c b/mod/src/cyber_device_character_device.c
new file mode 100644
index 0000000..f99e97e
--- /dev/null
+++ b/mod/src/cyber_device_character_device.c
@@ -0,0 +1,53 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_device.h"
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+extern struct cyber_device device;
+extern struct file_operations const cyber_operations;
+
+int cyber_device_init_character_device(void)
+{
+	int error = 0;
+
+	if((error = alloc_chrdev_region(&device.number, 0, 1, DEV_NAME)))
+	{
+		printk(KERN_ALERT DEV_NAME ": Failed to allocate character device!\n");
+	}
+
+	cdev_init(&device.character, &cyber_operations);
+	device.character.owner = THIS_MODULE;
+	device.character.ops = &cyber_operations;
+
+	if((error = cdev_add(&device.character, device.number, 1)))
+	{
+		printk(KERN_ALERT DEV_NAME ": Failed to add character device (Error: %d)!\n", error);
+	}
+
+	return error;
+}
+
+void cyber_device_shutdown_character_device(void)
+{
+	cdev_del(&device.character);
+	unregister_chrdev_region(device.number, 1);
+}
diff --git a/mod/src/cyber_device_device_class.c b/mod/src/cyber_device_device_class.c
new file mode 100644
index 0000000..b908da1
--- /dev/null
+++ b/mod/src/cyber_device_device_class.c
@@ -0,0 +1,85 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.	See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.	If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_device.h"
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/version.h>
+
+extern struct cyber_device device;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,4,0)
+static ssize_t available_show(struct class const * class, struct class_attribute const * attribute, char * __user buffer)
+#else
+static ssize_t available_show(struct class * class, struct class_attribute * attribute, char * __user buffer)
+#endif
+	{
+	return sprintf(buffer, "infinite\n");
+	}
+static CLASS_ATTR_RO(available);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,4,0)
+static ssize_t storage_technology_show(struct class const * class, struct class_attribute const * attribute, char * __user buffer)
+#else
+static ssize_t storage_technology_show(struct class * class, struct class_attribute * attribute, char * __user buffer)
+#endif
+	{
+	return sprintf(buffer, "condensed di-hydrogen-monoxide\n");
+	}
+static CLASS_ATTR_RO(storage_technology);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,2,0)
+static int cyber_device_handle_uevent(struct device const * kernelDevice, struct kobj_uevent_env * environment)
+#else
+static int cyber_device_handle_uevent(struct device * kernelDevice, struct kobj_uevent_env * environment)
+#endif
+{
+	add_uevent_var(environment, "DEVMODE=%#o", 0666);
+	return 0;
+}
+
+int cyber_device_init_device_class(void)
+{
+	int error = 0;
+
+	device.class.name = CLS_NAME;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6,4,0)
+	device.class.owner = THIS_MODULE;
+#endif
+	device.class.dev_uevent = cyber_device_handle_uevent;
+	if((error = class_register(&device.class)))
+	{
+		printk(KERN_ALERT DEV_NAME ": Failed to register CYBER device class!\n");
+	}
+
+	if((error = class_create_file(&device.class, &class_attr_available)) ||
+		 (error = class_create_file(&device.class, &class_attr_storage_technology)))
+	{
+		printk(KERN_ALERT DEV_NAME ": Failed to register sysfs CYBER attributes!\n");
+	}
+
+	return error;
+}
+
+void cyber_device_shutdown_device_class(void)
+{
+	class_unregister(&device.class);
+}
diff --git a/mod/src/cyber_device_kernel_device.c b/mod/src/cyber_device_kernel_device.c
new file mode 100644
index 0000000..6a2be4b
--- /dev/null
+++ b/mod/src/cyber_device_kernel_device.c
@@ -0,0 +1,52 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_device.h"
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+extern struct cyber_device device;
+
+static void cyber_device_close_kernel_device(struct device * device)
+{
+	printk(KERN_INFO DEV_NAME ": Closing kernel CYBER device\n");
+}
+
+int cyber_device_init_kernel_device(void)
+{
+	int error = 0;
+
+	device.kernel.class = &device.class;
+	device.kernel.devt = device.number;
+	device.kernel.init_name = DEV_NAME;
+	device.kernel.release = cyber_device_close_kernel_device;
+
+	if((error = device_register(&device.kernel)))
+	{
+		printk(KERN_ALERT DEV_NAME ": Failed to create CYBER device!\n");
+	}
+
+	return error;
+}
+
+void cyber_device_shutdown_kernel_device(void)
+{
+	device_unregister(&device.kernel);
+}
diff --git a/mod/src/cyber_file.c b/mod/src/cyber_file.c
new file mode 100644
index 0000000..4ff5581
--- /dev/null
+++ b/mod/src/cyber_file.c
@@ -0,0 +1,144 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber.h"
+#include "cyber_file.h"
+
+#include <asm/uaccess.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/moduleparam.h>
+
+static unsigned char separator = ' ';
+module_param(separator, byte, S_IRUGO);
+MODULE_PARM_DESC(separator, "The string to separate the CYBER by");
+
+
+static char cyberPattern[] = {'!', 'C', 'Y', 'B', 'E', 'R', '!', ' '};
+static char * cyberSpace;
+
+/**
+ * Handler for CYBER device open events
+ *
+ * @param inode The kernel inode associated with the CYBER device
+ * @param file The kernel file associated with the CYBER device
+ * @return zero on success, non-zero otherwise
+ */
+static int cyber_file_open(struct inode * inode, struct file * file)
+{
+	return 0;
+}
+
+/**
+ * Handler for CYBER device read events
+ *
+ * @param file The kernel file associated with the CYBER device
+ * @param buffer The user-space target buffer for all the CYBER
+ * @param size The size of the user-space buffer
+ * @param offset The offset into the CYBER
+ * @return The number of bytes that were read, negative on error
+ */
+static ssize_t cyber_file_read(struct file * file, char __user * buffer, size_t size, loff_t * offset)
+{
+	int const cyberChunks = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+	int const cybersPerChunk = (size > PAGE_SIZE ? PAGE_SIZE : size) / 8;
+	int copiedCybers = 0;
+
+	for(; copiedCybers < cyberChunks; ++copiedCybers)
+	{
+		if(raw_copy_to_user(buffer + copiedCybers * PAGE_SIZE, cyberSpace, cybersPerChunk * 8))
+		{
+			return -EFAULT;
+		}
+	}
+
+	return cyberChunks * cybersPerChunk * 8;
+}
+
+static int cyber_file_mmap(struct file * file, struct vm_area_struct * vma)
+{
+	ssize_t vmaSize = vma->vm_end - vma->vm_start;
+	ssize_t offset = 0;
+	for(; vmaSize; vmaSize -= PAGE_SIZE, ++offset)
+	{
+		vm_insert_page(vma, vma->vm_start + offset * PAGE_SIZE, virt_to_page(cyberSpace));
+	}
+	return 0;
+}
+
+/**
+ * Handler for CYBER device write events
+ *
+ * @param file The kernel file associated with the CYBER device
+ * @param buffer The user-space source buffer for all the CYBER
+ * @param size The size of the user-space buffer
+ * @param offset The offset into the CYBER
+ * @param The number of bytes that were written, negative on error
+ */
+static ssize_t cyber_file_write(struct file * file, char __user const * buffer, size_t size, loff_t * offset)
+{
+	return size;
+}
+
+/**
+ * Handler for CYBER device close events
+ *
+ * @param inode The kernel inode associated with the CYBER device
+ * @param file The kernel file associated with the CYBER device
+ * @param zero on success, non-zero otherwise
+ */
+static int cyber_file_close(struct inode * inode, struct file * file)
+{
+	return 0;
+}
+
+struct file_operations const cyber_operations = {
+	.owner = THIS_MODULE,
+	.open = cyber_file_open,
+	.read = cyber_file_read,
+	.write = cyber_file_write,
+	.release = cyber_file_close,
+	.mmap = cyber_file_mmap,
+};
+
+int cyber_file_init(void)
+{
+	int i;
+
+	printk(KERN_INFO DEV_NAME ": Initializing CYBER space\n");
+	cyberSpace = (char *)__get_free_page(GFP_KERNEL);
+	if(!cyberSpace)
+	{
+		printk(KERN_ALERT DEV_NAME ": Out of CYBER space!\n");
+		return ENOMEM;
+	}
+
+	cyberPattern[7] = separator;
+	for(i = 0; i < PAGE_SIZE; ++i)
+	{
+		cyberSpace[i] = cyberPattern[i % 8];
+	}
+
+	return 0;
+}
+
+void cyber_file_shutdown(void)
+{
+	printk(KERN_INFO DEV_NAME ": Releasing CYBER space\n");
+	free_page((unsigned long)cyberSpace);
+}
diff --git a/mod/src/cyber_lifecycle.c b/mod/src/cyber_lifecycle.c
new file mode 100644
index 0000000..02df37d
--- /dev/null
+++ b/mod/src/cyber_lifecycle.c
@@ -0,0 +1,49 @@
+/*
+ * cyber - Add CYBER to your system
+ * Copyright (C) 2017 Felix Morgner
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cyber_device.h"
+#include "cyber_file.h"
+#include "cyber_lifecycle.h"
+
+#include <linux/module.h>
+
+int cyber_driver_init(void)
+{
+	int error;
+
+	if((error = cyber_file_init()))
+	{
+		return error;
+	}
+
+	if((error = cyber_device_init()) < 0)
+	{
+		cyber_file_shutdown();
+		return error;
+	}
+
+	return 0;
+}
+
+void cyber_driver_exit(void)
+{
+	cyber_device_shutdown();
+	cyber_file_shutdown();
+}
+
+module_init(cyber_driver_init)
+module_exit(cyber_driver_exit)