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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef _KERNEL_H_
#define _KERNEL_H_
#include <stdbool.h>
/* wrap-safe macros for tick comparison */
#define TIME_AFTER(a,b) ((long)(b) - (long)(a) < 0)
#define TIME_BEFORE(a,b) TIME_AFTER(b,a)
#define HZ 100 /* number of ticks per second */
#define MAX_NUM_TICK_TASKS 4
#define QUEUE_LENGTH 16 /* MUST be a power of 2 */
#define QUEUE_LENGTH_MASK (QUEUE_LENGTH - 1)
struct event
{
int id;
void *data;
};
struct event_queue
{
struct event events[QUEUE_LENGTH];
unsigned int read;
unsigned int write;
};
struct mutex
{
bool locked;
};
/* global tick variable */
extern long current_tick;
/* kernel functions */
extern void kernel_init(void);
extern void yield(void);
extern void sleep(int ticks);
int set_irq_level(int level);
int tick_add_task(void (*f)(void));
int tick_remove_task(void (*f)(void));
extern void queue_init(struct event_queue *q);
extern void queue_wait(struct event_queue *q, struct event *ev);
extern void queue_post(struct event_queue *q, int id, void *data);
extern bool queue_empty(struct event_queue* q);
extern void mutex_init(struct mutex *m);
extern void mutex_lock(struct mutex *m);
extern void mutex_unlock(struct mutex *m);
#endif
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