| Jeff Dike | 9b67a3c | 2005-05-20 13:59:10 -0700 | [diff] [blame] | 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 "user_util.h" |
| 11 | #include "kern_util.h" |
| 12 | #include "initrd.h" |
| 13 | #include "init.h" |
| 14 | #include "os.h" |
| 15 | |
| 16 | /* Changed by uml_initrd_setup, which is a setup */ |
| 17 | static char *initrd __initdata = NULL; |
| 18 | |
| 19 | static int __init read_initrd(void) |
| 20 | { |
| 21 | void *area; |
| 22 | long long size; |
| 23 | int err; |
| 24 | |
| 25 | if(initrd == NULL) return 0; |
| 26 | err = os_file_size(initrd, &size); |
| 27 | if(err) return 0; |
| 28 | area = alloc_bootmem(size); |
| 29 | if(area == NULL) return 0; |
| 30 | if(load_initrd(initrd, area, size) == -1) return 0; |
| 31 | initrd_start = (unsigned long) area; |
| 32 | initrd_end = initrd_start + size; |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | __uml_postsetup(read_initrd); |
| 37 | |
| 38 | static int __init uml_initrd_setup(char *line, int *add) |
| 39 | { |
| 40 | initrd = line; |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | __uml_setup("initrd=", uml_initrd_setup, |
| 45 | "initrd=<initrd image>\n" |
| 46 | " This is used to boot UML from an initrd image. The argument is the\n" |
| 47 | " name of the file containing the image.\n\n" |
| 48 | ); |
| 49 | |
| 50 | int load_initrd(char *filename, void *buf, int size) |
| 51 | { |
| 52 | int fd, n; |
| 53 | |
| 54 | fd = os_open_file(filename, of_read(OPENFLAGS()), 0); |
| 55 | if(fd < 0){ |
| 56 | printk("Opening '%s' failed - err = %d\n", filename, -fd); |
| 57 | return(-1); |
| 58 | } |
| 59 | n = os_read_file(fd, buf, size); |
| 60 | if(n != size){ |
| 61 | printk("Read of %d bytes from '%s' failed, err = %d\n", size, |
| 62 | filename, -n); |
| 63 | return(-1); |
| 64 | } |
| 65 | |
| 66 | os_close_file(fd); |
| 67 | return(0); |
| 68 | } |
| 69 | /* |
| 70 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 71 | * Emacs will notice this stuff at the end of the file and automatically |
| 72 | * adjust the settings for this buffer only. This must remain at the end |
| 73 | * of the file. |
| 74 | * --------------------------------------------------------------------------- |
| 75 | * Local variables: |
| 76 | * c-file-style: "linux" |
| 77 | * End: |
| 78 | */ |