1 #include <linux/slab.h>
2 #include <linux/kexec.h>
3 #include <linux/proc_fs.h>
12 static struct buffer tags_buffer;
15 read_buffer(char* page, char** start, off_t off, int count,
18 struct buffer *buffer = (struct buffer *)data;
20 if (off >= buffer->size) {
25 count = min((int) (buffer->size - off), count);
27 memcpy(page, &buffer->data[off], count);
34 create_proc_entries(void)
36 struct proc_dir_entry* tags_entry;
38 tags_entry = create_proc_read_entry("atags", 0400, NULL, read_buffer, &tags_buffer);
46 static char __initdata atags_copy_buf[KEXEC_BOOT_PARAMS_SIZE];
47 static char __initdata *atags_copy;
49 void __init save_atags(const struct tag *tags)
51 atags_copy = atags_copy_buf;
52 memcpy(atags_copy, tags, KEXEC_BOOT_PARAMS_SIZE);
56 static int __init init_atags_procfs(void)
62 printk(KERN_WARNING "Exporting ATAGs: No saved tags found\n");
66 for (tag = (struct tag *) atags_copy; tag->hdr.size; tag = tag_next(tag))
69 tags_buffer.size = ((char *) tag - atags_copy) + sizeof(tag->hdr);
70 tags_buffer.data = kmalloc(tags_buffer.size, GFP_KERNEL);
71 if (tags_buffer.data == NULL)
73 memcpy(tags_buffer.data, atags_copy, tags_buffer.size);
75 error = create_proc_entries();
77 printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
78 kfree(tags_buffer.data);
80 tags_buffer.data = NULL;
86 arch_initcall(init_atags_procfs);