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.h"
  33 #include "proc.h"
  34 #include "ipc.h"
  35 #include <minix/com.h>
  36
  37 /* Define stack sizes for the kernel tasks included in the system image. */
  38 #define NO_STACK        0
  39 #define SMALL_STACK     (1024 * sizeof(char *))
  40 #define IDL_S   SMALL_STACK     /* 3 intr, 3 temps, 4 db for Intel */
  41 #define HRD_S   NO_STACK        /* dummy task, uses kernel stack */
  42 #define TSK_S   SMALL_STACK     /* system and clock task */
  43
  44 /* Stack space for all the task stacks.  Declared as (char *) to align it. */
  45 #define TOT_STACK_SPACE (IDL_S + HRD_S + (2 * TSK_S))
  46 PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
  47
  48 /* Define boot process flags. */
  49 #define BVM_F    (PROC_FULLVM)                    /* boot processes with VM */
  50
  51 /* The system image table lists all programs that are part of the boot image.
  52  * The order of the entries here MUST agree with the order of the programs
  53  * in the boot image and all kernel tasks must come first.
  54  *
  55  * Each entry provides the process number, flags, quantum size, scheduling
  56  * queue, and a name for the process table. The initial program counter and
  57  * stack size is also provided for kernel tasks.
  58  *
  59  * Note: the quantum size must be positive in all cases!
  60  */
  61
  62 PUBLIC struct boot_image image[] = {
  63 /* process nr, pc, flags, qs,  queue, stack,   name */
  64 {IDLE,       NULL,     0,  0,      0, IDL_S, "idle"  },
  65 {CLOCK,      NULL,     0,  0,      0, IDL_S, "clock" },
  66 {SYSTEM,     NULL,     0,  0,      0, IDL_S, "system"},
  67 {HARDWARE,      0,     0,  8, TASK_Q, HRD_S, "kernel"},
  68 {PM_PROC_NR,    0,     0, 32,      4, 0,     "pm"    },
  69 {FS_PROC_NR,    0,     0, 32,      5, 0,     "vfs"   },
  70 {RS_PROC_NR,    0,     0,  4,      4, 0,     "rs"    },
  71 {MEM_PROC_NR,   0, BVM_F,  4,      3, 0,     "memory"},
  72 {LOG_PROC_NR,   0, BVM_F,  4,      2, 0,     "log"   },
  73 {TTY_PROC_NR,   0, BVM_F,  4,      1, 0,     "tty"   },
  74 {DS_PROC_NR,    0, BVM_F,  4,      4, 0,     "ds"    },
  75 {MFS_PROC_NR,   0, BVM_F, 32,      5, 0,     "mfs"   },
  76 {VM_PROC_NR,    0,     0, 32,      2, 0,     "vm"    },
  77 {PFS_PROC_NR,   0, BVM_F, 32,      5, 0,     "pfs"   },
  78 {INIT_PROC_NR,  0, BVM_F,  8, USER_Q, 0,     "init"  },
  79 };
  80
  81 /* Verify the size of the system image table at compile time. Also verify that
  82  * the first chunk of the ipc mask has enough bits to accommodate the processes
  83  * in the image.
  84  * If a problem is detected, the size of the 'dummy' array will be negative,
  85  * causing a compile time error. Note that no space is actually allocated
  86  * because 'dummy' is declared extern.
  87  */
  88 extern int dummy[(NR_BOOT_PROCS==sizeof(image)/
  89         sizeof(struct boot_image))?1:-1];
  90 extern int dummy[(BITCHUNK_BITS > NR_BOOT_PROCS - 1) ? 1 : -1];