/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    RVCT/ARMCMx/chcore_v6m.c
 * @brief   ARMv6-M architecture port code.
 *
 * @addtogroup RVCT_ARMCMx_V6M_CORE
 * @{
 */

#include "ch.h"

/**
 * @brief   PC register temporary storage.
 */
regarm_t _port_saved_pc;

/**
 * @brief   IRQ nesting counter.
 */
unsigned _port_irq_nesting;

/**
 * @brief   System Timer vector.
 * @details This interrupt is used as system tick.
 * @note    The timer must be initialized in the startup code.
 */
CH_IRQ_HANDLER(SysTickVector) {

  CH_IRQ_PROLOGUE();

  chSysLockFromIsr();
  chSysTimerHandlerI();
  chSysUnlockFromIsr();

  CH_IRQ_EPILOGUE();
}

/** @} */