LXR linux/arch/m68k/kernel/bootinfo

   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
  16static char bootinfo_tmp[1536] __initdata;
  17
  18static void *bootinfo_copy;
  19static size_t bootinfo_size;
  20
  21static 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
  28static const struct file_operations bootinfo_fops = {
  29        .read = bootinfo_read,
  30        .llseek = default_llseek,
  31};
  32
  33void __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
  54static 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
  65        bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL);
  66        if (!bootinfo_copy)
  67                return -ENOMEM;
  68
  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
  78arch_initcall(init_bootinfo_procfs);
  79