/*
    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 Win32/hal_lld.c
 * @brief Win32 HAL subsystem low level driver code.
 * @addtogroup WIN32_HAL
 * @{
 */

#include "ch.h"
#include "hal.h"

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

static LARGE_INTEGER nextcnt;
static LARGE_INTEGER slice;

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief Low level HAL driver initialization.
 */
void hal_lld_init(void) {
  WSADATA wsaData;

  /* Initialization.*/
  if (WSAStartup(2, &wsaData) != 0) {
    printf("Unable to locate a winsock DLL\n");
    exit(1);
  }

  printf("ChibiOS/RT simulator (Win32)\n");
  if (!QueryPerformanceFrequency(&slice)) {
    printf("QueryPerformanceFrequency() error");
    exit(1);
  }
  slice.QuadPart /= CH_FREQUENCY;
  QueryPerformanceCounter(&nextcnt);
  nextcnt.QuadPart += slice.QuadPart;

  fflush(stdout);
}

/**
 * @brief Interrupt simulation.
 */
void ChkIntSources(void) {
  LARGE_INTEGER n;

#if HAL_USE_SERIAL
  if (sd_lld_interrupt_pending()) {
    dbg_check_lock();
    if (chSchIsPreemptionRequired())
      chSchDoReschedule();
    dbg_check_unlock();
    return;
  }
#endif

  /* Interrupt Timer simulation (10ms interval).*/
  QueryPerformanceCounter(&n);
  if (n.QuadPart > nextcnt.QuadPart) {
    nextcnt.QuadPart += slice.QuadPart;

    CH_IRQ_PROLOGUE();

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

    CH_IRQ_EPILOGUE();

    dbg_check_lock();
    if (chSchIsPreemptionRequired())
      chSchDoReschedule();
    dbg_check_unlock();
  }
}

/** @} */