在Linux内核驱动中，构建一个存放如下结构体指针的队列： struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };、 队列结构体如下：struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; }; 请给出操作这个队列的函数，包括初始化，入队，出队，注销等。 再构建两个函数： 函数一初始化msg结构体，将msg所有成员设置为常数（其中msg的complete成员设置为0），向msg的data数组内放置两个unsigned int 类型数据a和b，之后将msg结构体放入队列中，触发函数二，使用usleep_range()函数等待函数二将msg的complete成员设置为1后，获取函数二放入的c并还原成unsigned int 类型。 函数二需要从队列中取出msg，并进行解析：判断msg的module_id是否为0x1，如果不是，报错，如果是0x1,使用switch函数解析msg的cmd_id，再根据不同的cmd_id解析cmd_subid，具体解析内容为，取出在函数一向msg的data数组中放入的a和b，还原成unsigned int 类型数据，再将一个unsigned int 类型数据c=1000，放到msg的data数组内，之后，再将msg中的complete置1；请在驱动的probe函数中注册这个队列，在remove函数中注销队列，使用移位的方式放置和还原unsigned int类型数据

初始化队列的函数：

void init_ring_buffer(struct ring_buffer *rb, int size, unsigned int capacity) {
    rb->head = 0;
    rb->tail = 0;
    rb->size = size;
    rb->capacity = capacity;
    rb->data = kmalloc(capacity * sizeof(struct msg), GFP_KERNEL);
}

入队的函数：

int enqueue(struct ring_buffer *rb, struct msg *msg) {
    if ((rb->tail + 1) % rb->capacity == rb->head) {
        return -1;
    }
    rb->data[rb->tail] = *msg;
    rb->tail = (rb->tail + 1) % rb->capacity;
    return 0;
}

出队的函数：

int dequeue(struct ring_buffer *rb, struct msg *msg) {
    if (rb->head == rb->tail) {
        return -1;
    }
    *msg = rb->data[rb->head];
    rb->head = (rb->head + 1) % rb->capacity;
    return 0;
}

注销队列的函数：

void destroy_ring_buffer(struct ring_buffer *rb) {
    kfree(rb->data);
    rb->data = NULL;
}

初始化msg结构体并放入队列的函数：

void init_msg(struct msg *msg, unsigned int a, unsigned int b) {
    msg->module_id = 0x1;
    msg->cmd_id = 0;
    msg->cmd_subid = 0;
    msg->complete = 0;
    *(unsigned int *)(msg->data) = a;
    *(unsigned int *)(msg->data + sizeof(unsigned int)) = b;
}

unsigned int process_msg(struct msg *msg) {
    unsigned int a, b, c;
    a = *(unsigned int *)(msg->data);
    b = *(unsigned int *)(msg->data + sizeof(unsigned int));
    switch (msg->cmd_id) {
        case 0:
            switch (msg->cmd_subid) {
                case 0:
                    c = 1000;
                    *(unsigned int *)(msg->data) = c;
                    msg->complete = 1;
                    break;
                default:
                    printk(KERN_ERR "Invalid cmd_subid\n");
                    break;
            }
            break;
        default:
            printk(KERN_ERR "Invalid cmd_id\n");
            break;
    }
    return c;
}

在probe函数中注册队列：

struct ring_buffer *rb;

int probe() {
    int ret;
    rb = kmalloc(sizeof(struct ring_buffer), GFP_KERNEL);
    if (!rb) {
        printk(KERN_ERR "Failed to allocate memory\n");
        return -ENOMEM;
    }
    init_ring_buffer(rb, 128, 10);
    ret = register_chrdev(0, "queue_dev", &queue_fops);
    if (ret < 0) {
        printk(KERN_ERR "Failed to register device\n");
        return ret;
    }
    return 0;
}

在remove函数中注销队列：

void remove() {
    unregister_chrdev(0, "queue_dev");
    destroy_ring_buffer(rb);
    kfree(rb);
}

使用移位的方式放置和还原unsigned int类型数据：

unsigned int a = 0x12345678;
unsigned int b = 0x9abcdef0;

// 在msg的data数组中放置a和b
*(unsigned int *)(msg->data) = cpu_to_le32(a);
*(unsigned int *)(msg->data + sizeof(unsigned int)) = cpu_to_le32(b);

// 取出msg的data数组中的a和b并还原成unsigned int类型数据
unsigned int a = le32_to_cpu(*(unsigned int *)(msg->data));
unsigned int b = le32_to_cpu(*(unsigned int *)(msg->data + sizeof(unsigned int)));