public static int sysWriteByte(int fd, int data) { return 0; }
public static int sysWriteByte(int fd, int data) { return VM_SysCallMagic.sysWriteByte(VM_BootRecord.the_boot_record.sysWriteByteIP, fd, data); }
  public static int sysWriteByte(int fd, int data) { return 0; }