63 lines
1.3 KiB
C
Executable File
63 lines
1.3 KiB
C
Executable File
#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/highmem.h>
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#include <linux/uh.h>
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ssize_t uh_log_read(struct file *filep, char __user *buf, size_t size, loff_t *offset)
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{
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static size_t log_buf_size;
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unsigned long *log_addr = 0;
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if (!strcmp(filep->f_path.dentry->d_iname, "uh_log")) {
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log_addr = (unsigned long *)phys_to_virt(UH_LOG_START);
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} else
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return -EINVAL;
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if(!*offset){
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log_buf_size = 0;
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while(log_buf_size < UH_LOG_SIZE && ((char *)log_addr)[log_buf_size] != 0)
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log_buf_size++;
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}
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if (*offset >= log_buf_size)
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return 0;
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if (*offset + size > log_buf_size)
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size = log_buf_size - *offset;
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if (copy_to_user(buf, (const char *)log_addr + (*offset), size))
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return -EFAULT;
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*offset += size;
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return size;
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}
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static const struct file_operations uh_proc_fops = {
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.owner = THIS_MODULE,
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.read = uh_log_read,
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};
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static int __init uh_log_init(void)
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{
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struct proc_dir_entry *entry;
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entry = proc_create("uh_log", 0644, NULL, &uh_proc_fops);
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if (!entry) {
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pr_err("uh_log: Error creating proc entry\n");
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return -ENOMEM;
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}
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pr_info("uh_log : create /proc/uh_log\n");
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return 0;
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}
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static void __exit uh_log_exit(void)
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{
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remove_proc_entry("uh_log", NULL);
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}
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module_init(uh_log_init);
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module_exit(uh_log_exit);
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