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SP-2023_UNICOS_Internal_Reference_Manual_for_CRAY-2_Computer_Systems_5.0_


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Introductory Material
                                        Examining Kernel Code


                     This section describes the structure of the UNICOS kernel source
                     code, and gives some tips on how to examine the code for
                     debugging purposes.



Structure of kernel source code
                     In the released system, the kernel source code is in the directory
                     lusrlsrcluts. (This directory should not be accessible to users.)
                     This manual describes the source code in this directory and its
                     subdirectories. Associated definition files (include files, also
                     called header files) are also described; they are found in the
                     source directory lusr/include/sys.

                     This manual does not describe the software in other directories
                     (for example, the TCP/IP source code).

                     The uts directory contains the following subdirectories:

                       Subdirectory     Description

                       boot             Boot subdirectory
                       cf               Configuration subdirectory
                       fs               File system subdirectory
                       io               I/O subdirectory
                       md               Machine-dependent subdirectory
                       os               Operating system subdirectory

                     The directory uts also contains files used in building the kernel;
                     for example, the file osdef.s is the kernel's version of the
                     assembler definition file used in building the kernel.




SP-2023 5.0                CRAY PROPRIETARY                                            7
Examining Kernel Code                            UNICOS Internal Reference Manual for CRAY-2 Computer Systems




                         Figure 1 shows the structure of the lusrlsrcluts directory.




                  boot   cf                fs                  io                  md                 os

                                         Figure 1. Structure of the uts directory

                         The directory lusr/include/sys is the system include file
                         subdirectory. It contains the include files needed to build the
                         kernel.

                         The remainder of this subsection describes the contents of the
                         subdir~ctories.




The boot subdirectory

                         This subdirectory contains the source files boot.c, booth.s, and
                         boot.mk. It also contains the UNICOS boot program, osboot, if
                         that program has been built.



The cf subdirectory

                         This subdirectory contains the following files and subdirectories:

                              File         Description

                              Makefile     Kernel makefile.
                              conf.c       Configuration file.
                              name.c       File that contains the date and time of the kernel
                                           generation, as well as system jnformation returned




8                                CRAY PROPRIETARY                                         SP-2023 5.0
UNICOS Internal Reference Manual for CRAY-2 Computer Systems                                   Examining Kernel Code




                                           File                Description

                                                               by the uname(2) system call. name.c is edited at
                                                               kernel compilation time to reflect the uname
                                                               information; this editing is done in the kernel
                                                               makefile.
                                           hconf.h             Hardware configuration file; used for configuring
                                                               devices for the foreground processor.
                                           lib                 Subdirectory containing UNICOS object files used
                                                               in building the kernel.
                                           Iibtcp              Subdirectory containing TCP/IP object files used
                                                               in building the kernel.
                                           libnfs              Subdirectory contain~g UNICOS NFS object files
                                                               used in building the kernel.

                                        For more information on these files, or on system configuration in
                                        general, see the UN/COS System Administrator's Guide for
                                        CRAY-2 Computer Systems, publication SO-2019.



The fs subdirectory

                                        This subdirectory contains the file-system-specific portiO!1 of the
                                        file system switch (FSS) in the directories c2, proc, and sl.

                                        The directory c2 contains the file system routines for the native
                                        file system (C2FS).
                                        The directory proc contains the file system routines for the /proc
                                        file system.
                                        The directory sl contains the file system routines for the
                                        SUPERLINK file system (SLFS). (Only the kernel-level code for
                                        SUPERLINK is in the UNICOS 5.0 release; customers wishing to
                                        obtain SUPERLINK must order it as a separate product.)

                                        See "File System Switch," page 53, for more information on these
                                        file systems.




SP-2023 5.0                                      CRAY PROPRIETARY                                               9
Examining Kernel Code                            UNICOS Internal Reference Manual for CRAY-2 Computer Systems




The io subdirectory

                            This subdirectory contains the UNICOS device drivers. For
                            example, device drivers for the disks, the HYPERchannel, and the
                            CPUs are located in this subdirectory.



The md subdirectory

                            This subdirectory contains the machine-dependent code in the
                            UNICOS kernel; this code includes routines for context switching,
                            error processing, and interrupt handling. All of the kernel
                            assembly language files are in this subdirectory.



The os subdirectory

                            This subd~ectory contains the routines that are the core of the
                            UNICOS operating system.



The lusr/include/sys subdirectory

                            This directory contains the include files that the UNICOS kernel
                            uses when it is being built.



Kernel data structures
                            The kernel data structures, also referred to as tables, hold
                            important information for the kernel. For example, the process
                            table is an array that holds information about active processes on
                            the system. The "Kernel Data Structures" section, page 15,
                            describes some important data structures in UNICOS.




10                                  CRAY PROPRIETARY                                      SP-2023 5.0
UNICOS Internal Reference Manual for CRAY-2 Computer Systems                              Examining Kernel Code




Tips for examining kernel code
                                        This subsection describes the use of the ctags(l) command with
                                        the tag feature of the ex(l) and vi(l) editors to search for kernel
                                        routines.



Creating an index of kernel routines

                                        To print an index of kernel routines, listing the routine name, the
                                        location of the definition, and the line number of the definition,
                                        perfonn the following operations:

                                        



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