/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 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    cosmic/STM8/chcore.c
 * @brief   STM8 (Cosmic) architecture port code.
 *
 * @addtogroup STM8_COSMIC_CORE
 * @{
 */

#include "ch.h"

@tiny ReadyList rlist;

/**
 * @brief   Performs a context switch between two threads.
 *
 * @param otp   the thread to be switched out
 */
void _port_switch(Thread *otp) {

  _asm("        xref    _rlist          \n"
       "        ldw     y,sp            \n"
       "        ldw     (5,x),y         \n"
       "        ldw     x,_rlist+5      \n"
       "        ldw     x,(5,x)         \n"
       "        ldw     sp,x            \n", otp);
}

/**
 * @brief   Thread start code.
 */
void _port_thread_start(void) {

  chSysUnlock();
  _asm("        popw    x               \n");
}

/**
 * @brief   Halts the system.
 * @details This function is invoked by the operating system when an
 *          unrecoverable error is detected (for example because a programming
 *          error in the application code that triggers an assertion while in
 *          debug mode).
 */
void port_halt(void) {

  port_disable();
  while (TRUE) {
  }
}

/** @} */