minix/kernel/glo.h
Ben Gras 87f2236ad2 load average measurement implementation, accessable through
getloadavg() system call in the library.
2005-11-14 15:50:46 +00:00

67 lines
2.5 KiB
C
Executable file

#ifndef GLO_H
#define GLO_H
/* Global variables used in the kernel. This file contains the declarations;
* storage space for the variables is allocated in table.c, because EXTERN is
* defined as extern unless the _TABLE definition is seen. We rely on the
* compiler's default initialization (0) for several global variables.
*/
#ifdef _TABLE
#undef EXTERN
#define EXTERN
#endif
#include <minix/config.h>
#include "config.h"
/* Variables relating to shutting down MINIX. */
EXTERN char kernel_exception; /* TRUE after system exceptions */
EXTERN char shutdown_started; /* TRUE after shutdowns / reboots */
/* Kernel information structures. This groups vital kernel information. */
EXTERN phys_bytes aout; /* address of a.out headers */
EXTERN struct kinfo kinfo; /* kernel information for users */
EXTERN struct machine machine; /* machine information for users */
EXTERN struct kmessages kmess; /* diagnostic messages in kernel */
EXTERN struct randomness krandom; /* gather kernel random information */
EXTERN struct loadinfo kloadinfo; /* status of load average */
/* Process scheduling information and the kernel reentry count. */
EXTERN struct proc *prev_ptr; /* previously running process */
EXTERN struct proc *proc_ptr; /* pointer to currently running process */
EXTERN struct proc *next_ptr; /* next process to run after restart() */
EXTERN struct proc *bill_ptr; /* process to bill for clock ticks */
EXTERN char k_reenter; /* kernel reentry count (entry count less 1) */
EXTERN unsigned lost_ticks; /* clock ticks counted outside clock task */
#if (CHIP == INTEL)
/* Interrupt related variables. */
EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS]; /* hooks for general use */
EXTERN irq_hook_t *irq_handlers[NR_IRQ_VECTORS];/* list of IRQ handlers */
EXTERN int irq_actids[NR_IRQ_VECTORS]; /* IRQ ID bits active */
EXTERN int irq_use; /* map of all in-use irq's */
/* Miscellaneous. */
EXTERN reg_t mon_ss, mon_sp; /* boot monitor stack */
EXTERN int mon_return; /* true if we can return to monitor */
EXTERN int do_serial_debug;
/* VM */
EXTERN phys_bytes vm_base;
EXTERN phys_bytes vm_size;
EXTERN phys_bytes vm_mem_high;
/* Variables that are initialized elsewhere are just extern here. */
extern struct boot_image image[]; /* system image processes */
extern char *t_stack[]; /* task stack space */
extern struct segdesc_s gdt[]; /* global descriptor table */
EXTERN _PROTOTYPE( void (*level0_func), (void) );
#endif /* (CHIP == INTEL) */
#if (CHIP == M68000)
/* M68000 specific variables go here. */
#endif
#endif /* GLO_H */