Index: kern/loader.c
===================================================================
--- kern/loader.c	(revision 1845)
+++ kern/loader.c	(working copy)
@@ -22,12 +22,54 @@
 #include <grub/err.h>
 #include <grub/kernel.h>
 
+#define PREBOOT_HND(x) (((struct grub_preboot_t *)x))
+
+struct grub_preboot_t
+{
+  grub_err_t (*preboot_func) (int);  
+  struct grub_preboot_t *next;
+  struct grub_preboot_t **prev_pointer;
+};
+
 static grub_err_t (*grub_loader_boot_func) (void);
 static grub_err_t (*grub_loader_unload_func) (void);
 static int grub_loader_noreturn;
 
 static int grub_loader_loaded;
 
+static struct grub_preboot_t *grub_loader_preboots=0;
+
+void *
+grub_loader_add_preboot (grub_err_t (*preboot_func) (int))
+{
+  struct grub_preboot_t *cur;
+  if (!preboot_func)
+    return 0;
+  cur=(struct grub_preboot_t *)grub_malloc (sizeof (struct grub_preboot_t));
+  if (!cur)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "hook not added");
+      return 0;
+    }
+  cur->next=grub_loader_preboots;
+  cur->prev_pointer=0;
+  cur->next->prev_pointer=&(cur->next);
+  cur->preboot_func=preboot_func;
+  grub_loader_preboots=cur;
+  return cur;
+}
+
+void
+grub_loader_remove_preboot (void *p)
+{
+  if (!p)
+    return;
+  *(PREBOOT_HND(p)->prev_pointer)=PREBOOT_HND(p)->next;
+  if (PREBOOT_HND(p)->next)
+    PREBOOT_HND(p)->next->prev_pointer=PREBOOT_HND(p)->prev_pointer;
+    grub_free (p);
+}
+
 int
 grub_loader_is_loaded (void)
 {
@@ -64,12 +106,18 @@
 grub_err_t
 grub_loader_boot (void)
 {
+  struct grub_preboot_t *iter=grub_loader_preboots;
   if (! grub_loader_loaded)
     return grub_error (GRUB_ERR_NO_KERNEL, "no loaded kernel");
 
   if (grub_loader_noreturn)
     grub_machine_fini ();
-  
+  while (iter)
+    {
+      if (iter->preboot_func)
+	iter->preboot_func (grub_loader_noreturn);
+      iter=iter->next;
+    }
   return (grub_loader_boot_func) ();
 }
 
Index: include/grub/loader.h
===================================================================
--- include/grub/loader.h	(revision 1845)
+++ include/grub/loader.h	(working copy)
@@ -25,6 +25,7 @@
 #include <grub/err.h>
 #include <grub/types.h>
 
+
 /* Check if a loader is loaded.  */
 int EXPORT_FUNC(grub_loader_is_loaded) (void);
 
@@ -37,6 +38,12 @@
 /* Unset current loader, if any.  */
 void EXPORT_FUNC(grub_loader_unset) (void);
 
+/*Add a preboot function*/
+void *EXPORT_FUNC(grub_loader_add_preboot) (grub_err_t (*preboot_func) (int noreturn));
+
+/*Remove given preboot function*/
+void EXPORT_FUNC(grub_loader_remove_preboot) (void *hnd);
+
 /* Call the boot hook in current loader. This may or may not return,
    depending on the setting by grub_loader_set.  */
 grub_err_t EXPORT_FUNC(grub_loader_boot) (void);