www.pudn.com > lwip-1.3.0.rar > sys_arch.c

/** 
 * @file - sys_arch.c 
 * System Architecture support routines for Stellaris devices. 
 * 
 */ 
 
/* 
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science. 
 * All rights reserved.  
 *  
 * Redistribution and use in source and binary forms, with or without modification,  
 * are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 * 3. The name of the author may not be used to endorse or promote products 
 *    derived from this software without specific prior written permission.  
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED  
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF  
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT  
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT  
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN  
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING  
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY  
 * OF SUCH DAMAGE. 
 * 
 * This file is part of the lwIP TCP/IP stack. 
 *  
 * Author: Adam Dunkels  
 * 
 */ 
 
/* 
 * Copyright (c) 2008 Luminary Micro, Inc. 
 * 
 */ 
 
#include "lwip/opt.h" 
#include "lwip/sys.h" 
 
/* 
 * Luminary Micro DriverLib Header Files required for this interface driver. 
 * 
 */ 
#include "../../../../hw_memmap.h" 
#include "../../../../hw_types.h" 
#include "../../../../hw_ints.h" 
#include "../../../../src/interrupt.h" 
 
#if SYS_LIGHTWEIGHT_PROT 
/* 
 * This function is used to lock access to critical sections when lwipopt.h 
 * defines SYS_LIGHTWEIGHT_PROT. It disables interrupts and returns a value 
 * indicating the interrupt enable state when the function entered. This 
 * value must be passed back on the matching call to sys_arch_unprotect(). 
 * 
 * @return the interrupt level when the function was entered. 
 *  
 */ 
sys_prot_t 
sys_arch_protect(void) 
{ 
  tBoolean bRet = 1; 
 
  bRet = IntMasterDisable(); 
 
  return((sys_prot_t)bRet); 
} 
 
/* 
 * This function is used to unlock access to critical sections when lwipopt.h 
 * defines SYS_LIGHTWEIGHT_PROT. It enables interrupts if the value of the lev 
 * parameter indicates that they were enabled when the matching call to 
 * sys_arch_protect() was made. 
 * 
 * @param lev is the interrupt level when the matching protect function was 
 * called 
 * 
 */ 
void 
sys_arch_unprotect(sys_prot_t lev) 
{ 
  /* 
   * Only turn interrupts back on if they were originally on when the 
   * matching sys_arch_protect() call was made. 
   * 
   */ 
  if(!(lev & 1)) { 
    IntMasterEnable(); 
  } 
} 
#endif /* SYS_LIGHTWEIGHT_PROT */