sysstartup.c

日本著名的的嵌入式实时操作系统T-Kernel的源码及用户手册。

/*
 *----------------------------------------------------------------------
 *    T-Kernel
 *
 *    Copyright (C) 2004 by Ken Sakamura. All rights reserved.
 *    T-Kernel is distributed under the T-License.
 *----------------------------------------------------------------------
 *
 *    Version:   1.01.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2004/6/28.
 *
 *----------------------------------------------------------------------
 */

/*
 *	sysstartup.c (sysinit)
 *	Start/Stop System
 */

#include "sysinit.h"

/*
 * Subsystem
 */
IMPORT ER init_subsystems( void );
IMPORT ER start_subsystems( void );
IMPORT ER finish_subsystems( void );

/*
 * Manager/Driver
 */
IMPORT ER init_segmgr( void );			/* Segment management */
IMPORT ER start_segmgr( void );			/* Segment management */
IMPORT ER finish_segmgr( void );		/* Segment management */
IMPORT ER init_memmgr( void );			/* Memory management */
IMPORT ER start_memmgr( void );			/* Memory management */
IMPORT ER finish_memmgr( void );		/* Memory management */
IMPORT ER SystemManager( INT ac, UB *av[] );	/* T-Kernel/SM */
IMPORT ER init_Imalloc( void );			/* T-Kernel/SM */
IMPORT void _InitLibtk(void);			/* libtk */
IMPORT void _FinishLibtk(void);			/* libtk */
IMPORT void t_kernel_exit( void );		/* T-Kernel/OS */

/*
 * Initial task priority
 */
#define	InitTaskPri	(138)

/*
 * Initialize sequence before T-Kernel starts
 */
EXPORT void init_system( void )
{
	ER	err;

	/* Platform dependent initialize sequence */
	DispProgress(0x10);
	err = init_device();
	if ( err < E_OK ) goto err_ret;

	/* Initialize subsystem */
	DispProgress(0x11);
	err = init_subsystems();
	if ( err < E_OK ) goto err_ret;

	/* Initialize segment manager */
	DispProgress(0x12);
	err = init_segmgr();
	if ( err < E_OK ) goto err_ret;

	/* Initialize memory manager */
	DispProgress(0x13);
	err = init_memmgr();
	if ( err < E_OK ) goto err_ret;

	/* Initialize Imalloc */
	DispProgress(0x14);
	err = init_Imalloc();
	if ( err < E_OK ) goto err_ret;

	return;

err_ret:
#ifndef NO_KERNEL_MESSAGE
	tm_putstring("!ERROR! init_kernel\n");
#endif
	tm_monitor(); /* Stop */
}

/*
 * Start system
 */
EXPORT void start_system( void )
{
	ER	err;

	/* Initialize segment manager */
	DispProgress(0x30);
	err = start_segmgr();
	if ( err < E_OK ) goto err_ret;

	/* Start memory manager */
	DispProgress(0x31);
	err = start_memmgr();
	if ( err < E_OK ) goto err_ret;

	/* Initialize system manager */
	DispProgress(0x32);
	err = SystemManager(0, NULL);
	if ( err < E_OK ) goto err_ret;

	/* Initialize library (libtk)
	   V/K/Smalloc is available after this.*/
	DispProgress(0x33);
	_InitLibtk();

	/* Lower the initial task priority to initialize sequence
	   for the subsystem task at first.*/
	tk_chg_pri(TSK_SELF, InitTaskPri);

	/* Start system dependent sequence */
	DispProgress(0x34);
	err = start_device();
	if ( err < E_OK ) goto err_ret;

	/* Start subsystem */
	DispProgress(0x35);
	err = start_subsystems();
	if ( err < E_OK ) goto err_ret;

	return;

err_ret:
#ifndef NO_KERNEL_MESSAGE
	tm_putstring("!ERROR! start_system\n");
#endif
	tm_monitor();	/* Stop */
}

/*
 * Stop system
 */
EXPORT void shutdown_system( INT fin )
{
	/* Stop subsystem */
	finish_subsystems();

	/* Platform dependent finalize sequence */
	finish_device();

	/* Stop library (libtk) */
	_FinishLibtk();

	/* Shutdown message output */
#ifndef NO_KERNEL_MESSAGE
	if ( fin >= 0 ) {
	  tm_putstring("\n<< SYSTEM SHUTDOWN >>\n");
	}
#endif
	/* Stop T-Kernel/SM */
	SystemManager(-1, NULL);

	/* Stop memory manager */
	finish_memmgr();

	/* Stop segment manager */
	finish_segmgr();

	if ( fin < 0 ) {
		/* Re-start sequence (platform dependent) */
		restart_device(fin);
	}

	/* Stop system */
	t_kernel_exit();
}