/**
 * Kernel compile time configuration
 *
 * Copyright (C) 2010 Freie Universität Berlin
 *
 * This file subject to the terms and conditions of the GNU General Public
 * License. See the file LICENSE in the top level directory for more details.
 *
 * @ingroup kernel
 * @{
 * @file
 * @author Freie Universität Berlin, Computer Systems & Telematics
 * @author Kaspar Schleiser <kaspar.schleiser@fu-berlin.de>
 */

#ifndef KERNEL_H_
#define KERNEL_H_

/**
 * @defgroup    kernel  Kernel
 * @{
 */

#include <stdbool.h>
#include "config.h"
#include "tcb.h"
#include "cpu.h"
#include "flags.h"
#include "sched.h"
#include "cpu-conf.h"

/* ------------------------------------------------------------------------- */
/**
 * @name Kernel Compile-Time Configuration
 * @{
 */

/**
 * @def KERNEL_CONF_STACKSIZE_DEFAULT
 * @ingroup conf
 * @brief A reasonable default stack size that will suffice most smaller tasks
 */
#ifndef KERNEL_CONF_STACKSIZE_DEFAULT
#error KERNEL_CONF_STACKSIZE_DEFAULT must be defined per CPU
#endif

/**
 * @def KERNEL_CONF_STACKSIZE_IDLE
 * @ingroup conf
 * @brief Size of the idle task's stack in bytes
 */
#ifndef KERNEL_CONF_STACKSIZE_IDLE
#error KERNEL_CONF_STACKSIZE_IDLE must be defined per CPU
#endif

/**
 * @def KERNEL_CONF_STACKSIZE_MAIN
 * @ingroup conf
 * @brief Size of the main task's stack in bytes
 */
#ifndef KERNEL_CONF_STACKSIZE_MAIN
#define KERNEL_CONF_STACKSIZE_MAIN      KERNEL_CONF_STACKSIZE_DEFAULT
#endif

/** @} */
/* ------------------------------------------------------------------------- */


#define PID_NULL -1

#define PRIORITY_MIN            SCHED_PRIO_LEVELS-1

#define PRIORITY_IDLE           PRIORITY_MIN
#define PRIORITY_MAIN           (PRIORITY_MIN - (SCHED_PRIO_LEVELS/2))

/**
 * @brief   Check whether called from interrupt service routine
 *
 * @return  true if called from within interrupt
 * @return  false if not.
 */
int inISR(void);

#define LPM_PREVENT_SLEEP_UART    BIT2
#define LPM_PREVENT_SLEEP_HWTIMER    BIT1

extern volatile int lpm_prevent_sleep;

extern config_t sysconfig;

/** @} */
#endif /* KERNEL_H_ */