Commit | Line | Data |
---|---|---|
7bc1e4d8 GU |
1 | /* |
2 | * Based on arch/arm/kernel/atags_proc.c | |
3 | */ | |
4 | ||
5 | #include <linux/fs.h> | |
6 | #include <linux/init.h> | |
7 | #include <linux/printk.h> | |
8 | #include <linux/proc_fs.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/string.h> | |
11 | ||
12 | #include <asm/bootinfo.h> | |
13 | #include <asm/byteorder.h> | |
14 | ||
15 | ||
16 | static char bootinfo_tmp[1536] __initdata; | |
17 | ||
18 | static void *bootinfo_copy; | |
19 | static size_t bootinfo_size; | |
20 | ||
21 | static ssize_t bootinfo_read(struct file *file, char __user *buf, | |
22 | size_t count, loff_t *ppos) | |
23 | { | |
24 | return simple_read_from_buffer(buf, count, ppos, bootinfo_copy, | |
25 | bootinfo_size); | |
26 | } | |
27 | ||
28 | static const struct file_operations bootinfo_fops = { | |
29 | .read = bootinfo_read, | |
30 | .llseek = default_llseek, | |
31 | }; | |
32 | ||
33 | void __init save_bootinfo(const struct bi_record *bi) | |
34 | { | |
35 | const void *start = bi; | |
36 | size_t size = sizeof(bi->tag); | |
37 | ||
38 | while (be16_to_cpu(bi->tag) != BI_LAST) { | |
39 | uint16_t n = be16_to_cpu(bi->size); | |
40 | size += n; | |
41 | bi = (struct bi_record *)((unsigned long)bi + n); | |
42 | } | |
43 | ||
44 | if (size > sizeof(bootinfo_tmp)) { | |
45 | pr_err("Cannot save %zu bytes of bootinfo\n", size); | |
46 | return; | |
47 | } | |
48 | ||
49 | pr_info("Saving %zu bytes of bootinfo\n", size); | |
50 | memcpy(bootinfo_tmp, start, size); | |
51 | bootinfo_size = size; | |
52 | } | |
53 | ||
54 | static int __init init_bootinfo_procfs(void) | |
55 | { | |
56 | /* | |
57 | * This cannot go into save_bootinfo() because kmalloc and proc don't | |
58 | * work yet when it is called. | |
59 | */ | |
60 | struct proc_dir_entry *pde; | |
61 | ||
62 | if (!bootinfo_size) | |
63 | return -EINVAL; | |
64 | ||
1ecb4064 | 65 | bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL); |
7bc1e4d8 GU |
66 | if (!bootinfo_copy) |
67 | return -ENOMEM; | |
68 | ||
7bc1e4d8 GU |
69 | pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_fops, NULL); |
70 | if (!pde) { | |
71 | kfree(bootinfo_copy); | |
72 | return -ENOMEM; | |
73 | } | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | arch_initcall(init_bootinfo_procfs); |