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- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/proc_fs.h>
- #include <linux/highmem.h>
- #include <linux/uh.h>
- ssize_t uh_log_read(struct file *filep, char __user *buf, size_t size, loff_t *offset)
- {
- static size_t log_buf_size;
- unsigned long *log_addr = 0;
- if (!strcmp(filep->f_path.dentry->d_iname, "uh_log"))
- log_addr = (unsigned long *)phys_to_virt(UH_LOG_START);
- else
- return -EINVAL;
- /* To print s2 table status */
- uh_call(UH_APP_INIT, 13, 0, 0, 0, 0);
- if (!*offset) {
- log_buf_size = 0;
- while (log_buf_size < UH_LOG_SIZE && ((char *)log_addr)[log_buf_size] != 0)
- log_buf_size++;
- }
- if (*offset >= log_buf_size)
- return 0;
- if (*offset + size > log_buf_size)
- size = log_buf_size - *offset;
- if (copy_to_user(buf, (const char *)log_addr + (*offset), size))
- return -EFAULT;
- *offset += size;
- return size;
- }
- static const struct proc_ops uh_proc_ops = {
- .proc_read = uh_log_read,
- };
- static int __init uh_log_init(void)
- {
- struct proc_dir_entry *entry;
- entry = proc_create("uh_log", 0644, NULL, &uh_proc_ops);
- if (!entry) {
- pr_err("uh_log: Error creating proc entry\n");
- return -ENOMEM;
- }
- pr_info("uh_log : create /proc/uh_log\n");
- return 0;
- }
- static void __exit uh_log_exit(void)
- {
- remove_proc_entry("uh_log", NULL);
- }
- module_init(uh_log_init);
- module_exit(uh_log_exit);
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