Remove INT 13,4b handler; it represents an incomplete feature (CD-ROM

emulation support) for an unknown purpose, and breaks grub.

src/arch/i386/interface/pcbios/int13.c

 	return 0;
 }
 
-/**
- * INT 13, 4b - Get CD-ROM status / terminate emulation
- *
- * @v drive		Emulated drive
- * @v ds:si		El Torito specification packet to fill in
- * @ret status		Status code
- */
-static int int13_cdrom_status_terminate ( struct int13_drive *drive,
-					  struct i386_all_regs *ix86 ) {
-	struct int13_cdrom_specification specification;
-	unsigned int max_cylinder = drive->cylinders - 1;
-	unsigned int max_head = drive->heads - 1;
-	unsigned int max_sector = drive->sectors_per_track; /* sic */
-
-	DBG ( "Get CD-ROM emulation parameters to %04x:%04x\n",
-	      ix86->segs.ds, ix86->regs.di );
-
-	memset ( &specification, 0, sizeof ( specification ) );
-	specification.size = sizeof ( specification );
-	specification.drive = drive->drive;
-	specification.cyl = ( max_cylinder & 0xff );
-	specification.cyl_sector = ( ( ( max_cylinder >> 8 ) << 6 ) |
-				     max_sector );
-	specification.head = max_head;
-
-	DBG_HD ( &specification, sizeof ( specification ) );
-
-	copy_to_real ( ix86->segs.ds, ix86->regs.si, &specification,
-		       sizeof ( specification ) );
-	return 0;
-}
-
 /**
  * INT 13 handler
  *
 		case INT13_GET_EXTENDED_PARAMETERS:
 			status = int13_get_extended_parameters ( drive, ix86 );
 			break;
-		case INT13_CDROM_STATUS_TERMINATE:
-			status = int13_cdrom_status_terminate ( drive, ix86 );
-			break;
 		default:
 			DBG ( "*** Unrecognised INT 13 ***\n" );
 			status = -INT13_STATUS_INVALID;