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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/**
------------
CVS : $Id: init.c,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $
File: $File$
Revision: $Revision: 1.1.1.1 $
Last update: $Date: 2002-03-29 14:12:51 $
------------
Kernel module registration and miscellaneous functions
This file contains:
level_alloc_descriptor
resource_alloc_descriptor
__compute_args__
__call_main__
sys_atinit
sys_atexit
**/
/*
* Copyright (C) 2000 Paolo Gai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdarg.h>
#include <ll/ll.h>
#include <ll/stdlib.h>
#include <ll/stdio.h>
#include <ll/string.h>
#include <kernel/config.h>
#include <kernel/model.h>
#include <kernel/const.h>
#include <sys/types.h>
#include <kernel/types.h>
#include <kernel/descr.h>
#include <errno.h>
#include <kernel/var.h>
#include <kernel/func.h>
/*+ List of function to call at each rnlevel;
they are posted with sys_atrunlevel +*/
static struct exit_func {
void (*f)(void *);
void *arg;
int no_at_abort;
int next;
} runlevel_list[MAX_RUNLEVEL_FUNC];
static int runlevel_init_list;
static int runlevel_init_tail;
static int runlevel_shutdown_list;
static int runlevel_before_list;
static int runlevel_after_list;
static int runlevel_free;
void runlevel_init()
{
int i;
for (i = 0; i < MAX_RUNLEVEL_FUNC-1; i++)
runlevel_list[i].next = i+1;
runlevel_list[MAX_RUNLEVEL_FUNC-1].next = -1;
runlevel_init_list = -1;
runlevel_init_tail = -1;
runlevel_shutdown_list = -1;
runlevel_before_list = -1;
runlevel_after_list = -1;
runlevel_free = 0;
}
/*+ flags may be RUNLEVEL_XXX...
aborting may be 0 or NO_AT_ABORT +*/
void call_runlevel_func(int runlevel, int aborting)
{
int i, j;
switch (runlevel) {
case RUNLEVEL_INIT:
i = runlevel_init_list;
runlevel_init_list = -1;
break;
case RUNLEVEL_SHUTDOWN:
i = runlevel_shutdown_list;
runlevel_shutdown_list = -1;
break;
case RUNLEVEL_BEFORE_EXIT:
i = runlevel_before_list;
runlevel_before_list = -1;
break;
case RUNLEVEL_AFTER_EXIT:
i = runlevel_after_list;
runlevel_after_list = -1;
break;
default:
return;
}
// the task_activate must differ!!! look at activate.c
calling_runlevel_func = 1;
while (i != -1) {
if (!(aborting && runlevel_list[i].no_at_abort))
runlevel_list[i].f(runlevel_list[i].arg);
j = i;
i = runlevel_list[i].next;
runlevel_list[j].next = runlevel_free;
runlevel_free = j;
}
calling_runlevel_func = 0;
}
/*+ Use this function to post your own runlevel operations
(when uses some defines contained in const.h) +*/
int sys_atrunlevel(void (*func_code)(void *),void *parm, BYTE when)
{
register int i = 0;
SYS_FLAGS f;
f = kern_fsave();
if (runlevel_free == -1) {
errno = ETOOMUCH_EXITFUNC;
kern_frestore(f);
return -1;
}
i = runlevel_free;
runlevel_free = runlevel_list[runlevel_free].next;
runlevel_list[i].f = func_code;
runlevel_list[i].arg = parm;
runlevel_list[i].no_at_abort = when & NO_AT_ABORT;
switch (when & 0x03) {
case RUNLEVEL_INIT:
/* the init functions are called in the order they are posted
so, we insert at the queue tail */
runlevel_list[i].next = -1;
if (runlevel_init_list == -1)
runlevel_init_list = i;
else
runlevel_list[runlevel_init_tail].next = i;
runlevel_init_tail = i;
break;
case RUNLEVEL_SHUTDOWN:
runlevel_list[i].next = runlevel_shutdown_list;
runlevel_shutdown_list = i;
break;
case RUNLEVEL_BEFORE_EXIT:
runlevel_list[i].next = runlevel_before_list;
runlevel_before_list = i;
break;
default: // RUNLEVEL_AFTER_EXIT
runlevel_list[i].next = runlevel_after_list;
runlevel_after_list = i;
}
kern_frestore(f);
return 0;
}
/*+ This function returns a level_des **. the value returned shall be
used to register a level module. The function shall be called only at
module registration time. It assume that the system is not yet
initialized, so we shall not call sys_abort... +*/
LEVEL level_alloc_descriptor()
{
if (sched_levels == MAX_SCHED_LEVEL)
{
printk("Too many scheduling levels!!!\n");
l1_exit(1);
}
return sched_levels++;
}
/*+ This function returns a resource_des **. the value returned shall be
used to register a resource module. The function shall be called only at
module registration time. It assume that the system is not yet
initialized, so we shall not call sys_abort... +*/
RLEVEL resource_alloc_descriptor()
{
if (res_levels == MAX_RES_LEVEL)
{
printk("Too many resource levels!!!\n");
l1_exit(1);
}
return res_levels++;
}
/*+ This function compute the command line parameters from the multiboot_info
NOTE: this function modify the multiboot struct, so this function and
__call_main__ are mutually exclusives!!! +*/
void __compute_args__(struct multiboot_info *mbi, int *_argc, char **_argv)
{
register int i = 0;
char *cmdline = (char *)(mbi->cmdline);
/* creates the command line... */
*_argc = 0;
if (mbi->flags & MB_INFO_CMDLINE) {
while (cmdline[i] != 0) {
_argv[*_argc] = &(cmdline[i]);
while (cmdline[i] != ' ' && cmdline[i] != 0) i++;
if (cmdline[i] == ' ') {
cmdline[i] = 0; i++; (*_argc)++;
}
}
(*_argc)++;
}
}
/* note that the prototype is not public... so the user can
also use a int main(void), void main(void)... and so on... */
int main(int argc, char **argv);
/*+ This function calls the standard C main() function, with a
parameter list up to 100 parameters +*/
int __call_main__(struct multiboot_info *mbi)
{
int _argc;
char *_argv[100];
__compute_args__(mbi, &_argc, _argv);
return main(_argc,_argv);
}