57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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_
|
|
|
|
/* 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 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;
|
|
};
|
|
|
|
/* 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);
|
|
|
|
extern void queue_init(struct event_queue *q);
|
|
extern struct event *queue_wait(struct event_queue *q);
|
|
extern void queue_post(struct event_queue *q, int id, void *data);
|
|
|
|
#endif
|