1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/init.h"
7#include "linux/bootmem.h"
8#include "linux/initrd.h"
9#include "asm/types.h"
10#include "kern_util.h"
11#include "initrd.h"
12#include "init.h"
13#include "os.h"
14
15/* Changed by uml_initrd_setup, which is a setup */
16static char *initrd __initdata = NULL;
17
18static int __init read_initrd(void)
19{
20	void *area;
21	long long size;
22	int err;
23
24	if(initrd == NULL)
25		return 0;
26
27	err = os_file_size(initrd, &size);
28	if(err)
29		return 0;
30
31	area = alloc_bootmem(size);
32	if(area == NULL)
33		return 0;
34
35	if(load_initrd(initrd, area, size) == -1)
36		return 0;
37
38	initrd_start = (unsigned long) area;
39	initrd_end = initrd_start + size;
40	return 0;
41}
42
43__uml_postsetup(read_initrd);
44
45static int __init uml_initrd_setup(char *line, int *add)
46{
47	initrd = line;
48	return 0;
49}
50
51__uml_setup("initrd=", uml_initrd_setup,
52"initrd=<initrd image>\n"
53"    This is used to boot UML from an initrd image.  The argument is the\n"
54"    name of the file containing the image.\n\n"
55);
56
57int load_initrd(char *filename, void *buf, int size)
58{
59	int fd, n;
60
61	fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
62	if(fd < 0){
63		printk("Opening '%s' failed - err = %d\n", filename, -fd);
64		return -1;
65	}
66	n = os_read_file(fd, buf, size);
67	if(n != size){
68		printk("Read of %d bytes from '%s' failed, err = %d\n", size,
69		       filename, -n);
70		return -1;
71	}
72
73	os_close_file(fd);
74	return 0;
75}
76