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/*! \file include/sys/tm.h
\brief Internal Interface: task management
\author Markus L. Noga <markus@noga.de>
*/
/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* The Original Code is legOS code, released October 17, 1999.
*
* The Initial Developer of the Original Code is Markus L. Noga.
* Portions created by Markus L. Noga are Copyright (C) 1999
* Markus L. Noga. All Rights Reserved.
*
* Contributor(s): Markus L. Noga <markus@noga.de>
*/
#ifndef __sys_tm_h__
#define __sys_tm_h__
#ifdef __cplusplus
extern "C" {
#endif
#include <config.h>
#ifdef CONF_TM
#include "../tm.h"
///////////////////////////////////////////////////////////////////////
//
// Definitions
//
///////////////////////////////////////////////////////////////////////
#define SP_RETURN_OFFSET 10 //!< return address offset on stack in words.
#define IDLE_STACK_SIZE 128 //!< should suffice for IRQ service
///////////////////////////////////////////////////////////////////////
//
// Variables
//
///////////////////////////////////////////////////////////////////////
extern tdata_t td_single; //!< single process process data
extern tdata_t *ctid; //!< ptr to current process data
extern volatile unsigned int nb_tasks; //!< number of tasks
// nb_system_tasks is maintained in execi and kill/killall
// T_KERNEL tasks are counted as they are started
extern volatile unsigned int nb_system_tasks;
// tm_timeslice is from kernel/systime.c
extern volatile unsigned char tm_timeslice; //!< task time slice
///////////////////////////////////////////////////////////////////////
//
// Functions
//
///////////////////////////////////////////////////////////////////////
//! init task management
/* called in single tasking mode before task setup.
*/
extern void tm_init(void);
//! start task management
/*! called in single tasking mode after task setup
*/
extern void tm_start(void);
//! the task switcher IRQ handler
/*! located in the assembler process module
*/
extern void tm_switcher(void);
//! the process scheduler
/*! \param old_sp current task's current stack pointer
\return new task's current stack pointer
actual context switches performed by tm_switcher (assembler wrapper)
*/
extern size_t *tm_scheduler(size_t *old_sp);
//! the idle task
/*! infinite sleep instruction to conserve power
*/
extern int tm_idle_task(int,char**);
#endif // CONF_TM
#ifdef __cplusplus
}
#endif
#endif // __sys_tm_h__
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