arch/um/kernel/initrd.c

   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  */