kernel/glo.h

   1 #ifndef GLO_H
   2 #define GLO_H
   3
   4 /* Global variables used in the kernel. This file contains the declarations;
   5  * storage space for the variables is allocated in table.c, because EXTERN is
   6  * defined as extern unless the _TABLE definition is seen. We rely on the
   7  * compiler's default initialization (0) for several global variables.
   8  */
   9 #ifdef _TABLE
  10 #undef EXTERN
  11 #define EXTERN
  12 #endif
  13
  14 #include <minix/config.h>
  15 #include <archtypes.h>
  16 #include "config.h"
  17
  18 /* Variables relating to shutting down MINIX. */
  19 EXTERN char kernel_exception;           /* TRUE after system exceptions */
  20 EXTERN char shutdown_started;           /* TRUE after shutdowns / reboots */
  21
  22 /* Kernel information structures. This groups vital kernel information. */
  23 EXTERN phys_bytes aout;                 /* address of a.out headers */
  24 EXTERN struct kinfo kinfo;              /* kernel information for users */
  25 EXTERN struct machine machine;          /* machine information for users */
  26 EXTERN struct kmessages kmess;          /* diagnostic messages in kernel */
  27 EXTERN struct randomness krandom;       /* gather kernel random information */
  28 EXTERN struct loadinfo kloadinfo;       /* status of load average */
  29
  30 /* Process scheduling information and the kernel reentry count. */
  31 EXTERN struct proc *prev_ptr;   /* previously running process */
  32 EXTERN struct proc *proc_ptr;   /* pointer to currently running process */
  33 EXTERN struct proc *next_ptr;   /* next process to run after restart() */
  34 EXTERN struct proc *bill_ptr;   /* process to bill for clock ticks */
  35 EXTERN char k_reenter;          /* kernel reentry count (entry count less 1) */
  36 EXTERN unsigned lost_ticks;     /* clock ticks counted outside clock task */
  37
  38
  39 /* Interrupt related variables. */
  40 EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS];      /* hooks for general use */
  41 EXTERN int irq_actids[NR_IRQ_VECTORS];          /* IRQ ID bits active */
  42 EXTERN int irq_use;                             /* map of all in-use irq's */
  43
  44 /* Miscellaneous. */
  45 EXTERN reg_t mon_ss, mon_sp;            /* boot monitor stack */
  46 EXTERN int mon_return;                  /* true if we can return to monitor */
  47 EXTERN int do_serial_debug;
  48 EXTERN endpoint_t who_e;                /* message source endpoint */
  49 EXTERN int who_p;                       /* message source proc */
  50 EXTERN int sys_call_code;               /* kernel call number in SYSTEM */
  51
  52 /* VM */
  53 EXTERN phys_bytes vm_base;
  54 EXTERN phys_bytes vm_size;
  55 EXTERN phys_bytes vm_mem_high;
  56
  57 /* Variables that are initialized elsewhere are just extern here. */
  58 extern struct boot_image image[];       /* system image processes */
  59 extern char *t_stack[];                 /* task stack space */
  60 extern struct segdesc_s gdt[];          /* global descriptor table */
  61
  62 EXTERN _PROTOTYPE( void (*level0_func), (void) );
  63
  64 #endif /* GLO_H */