81 lines
3.2 KiB
C
Executable file
81 lines
3.2 KiB
C
Executable file
/* Global variables used in the kernel. This file contains the declarations;
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* storage space for the variables is allocated in table.c, because EXTERN is
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* defined as extern unless the _TABLE definition is seen.
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*/
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#ifdef _TABLE
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#undef EXTERN
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#define EXTERN
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#endif
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/* MINIX' shutdown sequence uses watchdog timers to stop system services. The
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* flag shutting_down must be initialized to FALSE. We rely on the compiler's
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* default initialization (0) of global variables here.
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*/
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EXTERN int skip_stop_sequence; /* set to TRUE in case of an exception() */
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EXTERN int shutting_down; /* TRUE if the system is shutting down */
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EXTERN struct proc *shutdown_process; /* process awaiting shutdown of */
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EXTERN timer_t shutdown_timer; /* watchdog function called after timeout */
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/* Kernel memory. */
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EXTERN phys_bytes code_base; /* base of kernel code */
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EXTERN phys_bytes data_base; /* base of kernel data */
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EXTERN phys_bytes aout; /* address of a.out headers */
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/* Low level notifications may be put on the 'held' queue to prevent races. */
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EXTERN struct proc *held_head; /* head of queue of held-up interrupts */
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EXTERN struct proc *held_tail; /* tail of queue of held-up interrupts */
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EXTERN unsigned char k_reenter; /* kernel reentry count (entry count less 1)*/
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/* Process table. Here to stop too many things having to include proc.h. */
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EXTERN struct proc *proc_ptr; /* pointer to currently running process */
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/* Memory sizes. */
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EXTERN struct memory mem[NR_MEMS]; /* base and size of chunks of memory */
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EXTERN phys_clicks tot_mem_size; /* total system memory size */
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/* Miscellaneous. */
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EXTERN unsigned lost_ticks; /* clock ticks counted outside the clock task */
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#if (CHIP == INTEL)
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/* Machine type. */
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EXTERN int pc_at; /* PC-AT compatible hardware interface */
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EXTERN int ps_mca; /* PS/2 with Micro Channel */
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EXTERN unsigned int processor; /* 86, 186, 286, 386, ... */
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#if _WORD_SIZE == 2
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EXTERN int protected_mode; /* nonzero if running in Intel protected mode*/
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#else
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#define protected_mode 1 /* 386 mode implies protected mode */
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#endif
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/* Video card types. */
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EXTERN int ega; /* nonzero if console is EGA */
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EXTERN int vga; /* nonzero if console is VGA */
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/* Interrupt related variables. */
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EXTERN struct irqtab irqtab[NR_IRQ_VECTORS]; /* table with IRQ policies */
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EXTERN irq_hook_t *irq_hooks[NR_IRQ_VECTORS]; /* list of IRQ handlers */
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EXTERN int irq_actids[NR_IRQ_VECTORS]; /* IRQ ID bits active */
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EXTERN int irq_use; /* bit map of all in-use irq's */
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/* Miscellaneous. */
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EXTERN struct kmessages kmess; /* diagnostic messages in kernel */
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EXTERN reg_t mon_ss, mon_sp; /* monitor stack */
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EXTERN int mon_return; /* true if return to the monitor possible */
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EXTERN phys_bytes mon_params; /* boot parameter block passed in/out */
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EXTERN size_t mon_parmsize; /* boot parameter block size */
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/* Variables that are initialized elsewhere are just extern here. */
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extern struct system_image image[]; /* system image processes (table.c) */
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extern char *t_stack[]; /* stack space for kernel tasks (table.c) */
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extern struct segdesc_s gdt[]; /* protected mode global descriptor (protect.c) */
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EXTERN _PROTOTYPE( void (*level0_func), (void) );
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#endif /* (CHIP == INTEL) */
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#if (CHIP == M68000)
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/* M68000 specific variables go here. */
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#endif
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