kern/loader.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2002,2003,2004,2006,2007  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/loader.h>
  20 #include <grub/misc.h>
  21 #include <grub/mm.h>
  22 #include <grub/err.h>
  23 #include <grub/kernel.h>
  24
  25 static grub_err_t (*grub_loader_boot_func) (void);
  26 static grub_err_t (*grub_loader_unload_func) (void);
  27 static int grub_loader_noreturn;
  28
  29 static int grub_loader_loaded;
  30
  31 int
  32 grub_loader_is_loaded (void)
  33 {
  34   return grub_loader_loaded;
  35 }
  36
  37 void
  38 grub_loader_set (grub_err_t (*boot) (void),
  39                  grub_err_t (*unload) (void),
  40                  int noreturn)
  41 {
  42   if (grub_loader_loaded && grub_loader_unload_func)
  43     grub_loader_unload_func ();
  44
  45   grub_loader_boot_func = boot;
  46   grub_loader_unload_func = unload;
  47   grub_loader_noreturn = noreturn;
  48
  49   grub_loader_loaded = 1;
  50 }
  51
  52 void
  53 grub_loader_unset(void)
  54 {
  55   if (grub_loader_loaded && grub_loader_unload_func)
  56     grub_loader_unload_func ();
  57
  58   grub_loader_boot_func = 0;
  59   grub_loader_unload_func = 0;
  60
  61   grub_loader_loaded = 0;
  62 }
  63
  64 grub_err_t
  65 grub_loader_boot (void)
  66 {
  67   if (! grub_loader_loaded)
  68     return grub_error (GRUB_ERR_NO_KERNEL, "no loaded kernel");
  69
  70   if (grub_loader_noreturn)
  71     grub_machine_fini ();
  72
  73   return (grub_loader_boot_func) ();
  74 }
  75