WebSVN - shark - Blame - Rev 1621 - /shark/branches/xen/include/kernel/var.h

Rev	Author	Line No.	Line
2	pj	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Paolo Gai <pj@gandalf.sssup.it>
		10	* Massimiliano Giorgi <massy@gandalf.sssup.it>
		11	* Luca Abeni <luca@gandalf.sssup.it>
		12	* (see the web pages for full authors list)
		13	*
		14	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		15	*
		16	* http://www.sssup.it
		17	* http://retis.sssup.it
		18	* http://shark.sssup.it
		19	*/
		20
		21
		22	/**
		23	------------
922	pj	24	CVS : $Id: var.h,v 1.5 2005-01-08 14:50:58 pj Exp $
2	pj	25
		26	File: $File$
922	pj	27	Revision: $Revision: 1.5 $
		28	Last update: $Date: 2005-01-08 14:50:58 $
2	pj	29	------------
		30
		31	Kernel global variables
		32
		33	**/
		34
		35	/*
		36	* Copyright (C) 2000 Paolo Gai
		37	*
		38	* This program is free software; you can redistribute it and/or modify
		39	* it under the terms of the GNU General Public License as published by
		40	* the Free Software Foundation; either version 2 of the License, or
		41	* (at your option) any later version.
		42	*
		43	* This program is distributed in the hope that it will be useful,
		44	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		45	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		46	* GNU General Public License for more details.
		47	*
		48	* You should have received a copy of the GNU General Public License
		49	* along with this program; if not, write to the Free Software
		50	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		51	*
		52	*/
		53
		54	#ifndef __KERNEL_VAR_H__
		55	#define __KERNEL_VAR_H__
		56
		57	#include <ll/ll.h>
		58	#include <sys/types.h>
		59	#include <kernel/descr.h>
1621	fabio	60	#include <arch/sys/cdefs.h>
2	pj	61
79	pj	62	__BEGIN_DECLS
		63
2	pj	64	/---------------------------------------------------------------------/
		65	/* Kernel global variables: system queues & clock counters ... */
		66	/---------------------------------------------------------------------/
		67
		68	extern proc_des proc_table[]; /+ Process descriptor table +/
38	pj	69
2	pj	70	extern level_des level_table[]; /+ Level descriptor table +*/
38	pj	71	/* for a description of the following fields, look in kernel/kern.c */
		72	extern size_t level_size[];
		73	extern int level_used[];
		74	extern int level_first;
		75	extern int level_last;
		76	extern int level_free;
		77	extern int level_next[];
		78	extern int level_prev[];
		79
2	pj	80	extern resource_des resource_table[]; /+ Resource descriptor table +*/
		81
		82
		83	extern PID exec; /+ task suggested by the scheduler +/
		84	extern PID exec_shadow; /+ task really executed +/
		85
29	pj	86	extern IQUEUE freedesc; /+ Free descriptor handled as a queue +/
2	pj	87
		88	extern TIME sys_tick; /+ System tick (in usec) +/
		89	extern struct timespec schedule_time;
		90	/*+ Time at witch the last scheduler()
		91	was called +*/
		92
		93	extern int cap_timer; /*+ the capacity event posted when the
		94	task starts +*/
		95	extern struct timespec cap_lasttime;
		96	/*+ the time at whitch the capacity
		97	event is posted. Normally, it is
		98	equal to schedule_time +*/
		99
		100	extern DWORD res_levels; /+ Resource levels active in the system +/
		101
		102	extern int task_counter; /*+ Application task counter. It represent
		103	the number of Application tasks in the
		104	system. When all Application Tasks end,
		105	also the system ends. +*/
		106
		107	extern int system_counter; /*+ System task counter. It represent
		108	the number of System tasks in the
		109	system with the NO_KILL flag reset.
		110	When all Application Tasks end,
		111	the system waits for the end of the
		112	system tasks and then it ends. +*/
		113
		114
922	pj	115	extern int calling_runlevel_func; /*+ this variable is set to 1 into
2	pj	116	call_runlevel_func (look at init.c)
		117	ad it is used because the task_activate
		118	(look at activate.c) must work in a
		119	different way when the system is in the
		120	global_context +*/
		121
922	pj	122	#define EXIT_CALLED 1
		123	#define _EXIT_CALLED 2
		124	extern int _exit_has_been_called; /*+ this variable is set when _exit is
		125	called. in this case, the atexit
		126	functions will not be called.
		127	Values: - 0 neither exit or _exit
		128	have been called - 1 exit has been
		129	called - 2 _exit has been called +*/
		130
		131	extern CONTEXT global_context; /*+ Context used during initialization;
		132	It references also a safe stack +*/
		133
		134	extern int runlevel; /*+ this is the system runlevel... it
		135	may be from 0 to 4: 0 - init 1 -
		136	running 2 - shutdown 3 - before
		137	halting 4 - halting +*/
		138
		139	extern int event_noreschedule; /*+ This controls if the system needed
		140	to be rescheduled at the end of an
		141	IRQ/event or if must not because
		142	exit, _exit, or sys_abort_shutdown
		143	was called +*/
		144
		145
79	pj	146	__END_DECLS
2	pj	147	#endif /* __VAR_H__ */

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