multiboot video support

video/efi_gop.c

@@ -353,6 +353,7 @@ grub_video_gop_get_info_and_fini (struct grub_video_mode_info *mode_info,
 static struct grub_video_adapter grub_video_gop_adapter =
   {
     .name = "EFI GOP driver",
+    .id = GRUB_VIDEO_DRIVER_EFI_GOP,
 
     .init = grub_video_gop_init,
     .fini = grub_video_gop_fini,

video/efi_uga.c

@@ -300,6 +300,7 @@ grub_video_uga_get_info_and_fini (struct grub_video_mode_info *mode_info,
 static struct grub_video_adapter grub_video_uga_adapter =
   {
     .name = "EFI UGA driver",
+    .id = GRUB_VIDEO_DRIVER_EFI_UGA,
 
     .init = grub_video_uga_init,
     .fini = grub_video_uga_fini,

video/i386/pc/vbe.c

@@ -557,6 +557,7 @@ grub_video_vbe_get_info_and_fini (struct grub_video_mode_info *mode_info,
 static struct grub_video_adapter grub_video_vbe_adapter =
   {
     .name = "VESA BIOS Extension Video Driver",
+    .id = GRUB_VIDEO_DRIVER_VBE,
 
     .init = grub_video_vbe_init,
     .fini = grub_video_vbe_fini,

video/video.c

@@ -93,6 +93,14 @@ grub_video_get_info (struct grub_video_mode_info *mode_info)
   return grub_video_adapter_active->get_info (mode_info);
 }
 
+grub_video_driver_id_t
+grub_video_get_driver_id (void)
+{
+  if (! grub_video_adapter_active)
+    return GRUB_VIDEO_DRIVER_NONE;
+  return grub_video_adapter_active->id;
+}
+
 /* Get information about active video mode.  */
 grub_err_t
 grub_video_get_info_and_fini (struct grub_video_mode_info *mode_info,