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 */ 79