%define SYS_FINFO 75 ; Get file information
%define SYS_SEEK 76 ; Seek to a new position in the file
%define SYS_TELL 77 ; Return the current file position
+%define SYS_CHDIR 78 ; Change current directory
+%define SYS_GETCWD 79 ; Get current directory
+%define SYS_MOUNT 80 ; Mount a filesystem