Commit | Line | Data |
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9b67a3c4 JD |
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" | |
9b67a3c4 JD |
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 */ | |
16 | static char *initrd __initdata = NULL; | |
17 | ||
18 | static int __init read_initrd(void) | |
19 | { | |
20 | void *area; | |
21 | long long size; | |
22 | int err; | |
23 | ||
24 | if(initrd == NULL) return 0; | |
25 | err = os_file_size(initrd, &size); | |
26 | if(err) return 0; | |
27 | area = alloc_bootmem(size); | |
28 | if(area == NULL) return 0; | |
29 | if(load_initrd(initrd, area, size) == -1) return 0; | |
30 | initrd_start = (unsigned long) area; | |
31 | initrd_end = initrd_start + size; | |
32 | return 0; | |
33 | } | |
34 | ||
35 | __uml_postsetup(read_initrd); | |
36 | ||
37 | static int __init uml_initrd_setup(char *line, int *add) | |
38 | { | |
39 | initrd = line; | |
40 | return 0; | |
41 | } | |
42 | ||
43 | __uml_setup("initrd=", uml_initrd_setup, | |
44 | "initrd=<initrd image>\n" | |
45 | " This is used to boot UML from an initrd image. The argument is the\n" | |
46 | " name of the file containing the image.\n\n" | |
47 | ); | |
48 | ||
49 | int load_initrd(char *filename, void *buf, int size) | |
50 | { | |
51 | int fd, n; | |
52 | ||
53 | fd = os_open_file(filename, of_read(OPENFLAGS()), 0); | |
54 | if(fd < 0){ | |
55 | printk("Opening '%s' failed - err = %d\n", filename, -fd); | |
56 | return(-1); | |
57 | } | |
fda83a99 | 58 | n = os_read_file_k(fd, buf, size); |
9b67a3c4 JD |
59 | if(n != size){ |
60 | printk("Read of %d bytes from '%s' failed, err = %d\n", size, | |
61 | filename, -n); | |
62 | return(-1); | |
63 | } | |
64 | ||
65 | os_close_file(fd); | |
66 | return(0); | |
67 | } | |
68 | /* | |
69 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
70 | * Emacs will notice this stuff at the end of the file and automatically | |
71 | * adjust the settings for this buffer only. This must remain at the end | |
72 | * of the file. | |
73 | * --------------------------------------------------------------------------- | |
74 | * Local variables: | |
75 | * c-file-style: "linux" | |
76 | * End: | |
77 | */ |