kernel/table.c

   1 /* The object file of "table.c" contains most kernel data. Variables that
   2  * are declared in the *.h files appear with EXTERN in front of them, as in
   3  *
   4  *    EXTERN int x;
   5  *
   6  * Normally EXTERN is defined as extern, so when they are included in another
   7  * file, no storage is allocated.  If EXTERN were not present, but just say,
   8  *
   9  *    int x;
  10  *
  11  * then including this file in several source files would cause 'x' to be
  12  * declared several times.  While some linkers accept this, others do not,
  13  * so they are declared extern when included normally.  However, it must be
  14  * declared for real somewhere.  That is done here, by redefining EXTERN as
  15  * the null string, so that inclusion of all *.h files in table.c actually
  16  * generates storage for them.
  17  *
  18  * Various variables could not be declared EXTERN, but are declared PUBLIC
  19  * or PRIVATE. The reason for this is that extern variables cannot have a
  20  * default initialization. If such variables are shared, they must also be
  21  * declared in one of the *.h files without the initialization.  Examples
  22  * include 'boot_image' (this file) and 'idt' and 'gdt' (protect.c).
  23  *
  24  * Changes:
  25  *    Nov 22, 2009   rewrite of privilege management (Cristiano Giuffrida)
  26  *    Aug 02, 2005   set privileges and minimal boot image (Jorrit N. Herder)
  27  *    Oct 17, 2004   updated above and tasktab comments  (Jorrit N. Herder)
  28  *    May 01, 2004   changed struct for system image  (Jorrit N. Herder)
  29  */
  30 #define _TABLE
  31
  32 #include "kernel/kernel.h"
  33 #include <minix/com.h>
  34
  35 /* The system image table lists all programs that are part of the boot image.
  36  * The order of the entries here MUST agree with the order of the programs
  37  * in the boot image and all kernel tasks must come first.
  38  * The order of the entries here matches the priority NOTIFY messages are
  39  * delivered to a given process. NOTIFY messages are always delivered with
  40  * the highest priority. DS must be the first system process in the list to
  41  * allow reliable asynchronous publishing of system events. RS comes right after
  42  * to prioritize ping messages periodically delivered to system processes.
  43  */
  44
  45 struct boot_image image[NR_BOOT_PROCS] = {
  46 /* process nr, flags, stack size, name */
  47 {ASYNCM,        "asyncm"},
  48 {IDLE,          "idle"  },
  49 {CLOCK,         "clock" },
  50 {SYSTEM,        "system"},
  51 {HARDWARE,      "kernel"},
  52
  53 {DS_PROC_NR,    "ds"    },
  54 {RS_PROC_NR,    "rs"    },
  55
  56 {PM_PROC_NR,    "pm"    },
  57 {SCHED_PROC_NR, "sched" },
  58 {VFS_PROC_NR,   "vfs"   },
  59 {MEM_PROC_NR,   "memory"},
  60 {LOG_PROC_NR,   "log"   },
  61 {TTY_PROC_NR,   "tty"   },
  62 {MFS_PROC_NR,   "mfs"   },
  63 {VM_PROC_NR,    "vm"    },
  64 {PFS_PROC_NR,   "pfs"   },
  65 {INIT_PROC_NR,  "init"  },
  66 };
  67