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/************************************************************************/
/* */
/* File: core.h */
/* Description: armen internals */
/* Version: 1.0 */
/* Author: Otto Mattik */
/* */
/* (C)Copyright Otto Mattik 2014-2021. */
/* */
/* This file is a part of 'armen' (a tiny operating system). */
/* 'armen' is distributed under the CeCILL-V2.1 licence. For more */
/* details about this licence, please visit the website cecill.info */
/* */
/************************************************************************/
#ifndef _ARMEN_CORE_H_
#define _ARMEN_CORE_H_
#include "armen.h"
#ifdef __AVR_ARCH__
#include "avr/core.h"
#endif
/*
* number of threads
*/
#define ARMEN_THREAD_MIN 2
#define ARMEN_THREAD_MAX 8
#if defined(THREAD)
#if (THREAD < 0) || (THREAD > (ARMEN_THREAD_MAX-ARMEN_THREAD_MIN))
#error "invalid number of threads"
#endif
#else
#define THREAD 1
#endif
#define ARMEN_THREADS (ARMEN_THREAD_MIN+THREAD)
/*
* number of timers
*/
#define ARMEN_TIMER_MIN 1
#define ARMEN_TIMER_MAX 2
#if defined(TIMER)
#if (TIMER < ARMEN_TIMER_MIN) || (TIMER > ARMEN_TIMER_MAX)
#error "invalid number of timers"
#endif
#define ARMEN_TIMERS TIMER
#else
#define ARMEN_TIMERS ARMEN_TIMER_MIN
#endif
typedef struct {
uint8_t lock;
uint8_t value;
uint8_t count;
uint8_t pad;
} _sem_t;
typedef struct {
uint8_t status; /* status (see below) */
uint8_t rank; /* priority set by user */
uint8_t order; /* priority set by kernel */
uint8_t joinid; /* thread where waiting for termination */
uint16_t events; /* events for whitch thread is suspended */
uint16_t event; /* last event */
timer_t timer1; /* timer counter 1 (used by sleep function) */
#if (ARMEN_TIMERS == 2)
timer_t timer2; /* timer counter 2 */
#endif
void* (*entry)(void*); /* thread entry point */
void* param; /* calling argument or returned value */
void* istack; /* initial value of stack pointer */
void* cstack; /* current stack pointer */
#if defined(USE_SEM)
void* sem; /* semaphore on thread is waiting */
#endif
} _thread_t;
/*
* status of a thread
*/
#define TS_UNUSED 0
#define TS_RUNNING 1
#define TS_SUSPENDED 2
/*
* events (see also armen.h)
*/
#define EVENT_JOIN 0x4000
#define EVENT_SEM 0x8000
extern uint8_t volatile _cur_thread; /* id of current thread */
extern _thread_t _threads[]; /* table of threads */
extern void _thread_exit( void );
extern void* _idle( void* );
extern void _schedule( void );
extern uint8_t _disable_intr( void );
extern void _enable_intr( uint8_t flag );
extern void* _init_context( void* (*entry)(void*), void* param, void* sp );
extern void* _save_context( void );
extern void _restore_context( void* sp );
extern void _sys_init( void* ram_start, void* ram_end );
extern void _sys_clock( void );
extern void _scheduler( void* sp );
extern void _wakeup( uint16_t event, void* param );
extern void _uart_init( void );
#endif
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