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/* $Id: stack.hh,v 1.4 2008-04-26 18:04:31 sybreon Exp $

**

** AEMB2 HI-PERFORMANCE CPU

** Copyright (C) 2004-2007 Shawn Tan Ser Ngiap 

**

** This file is part of AEMB.

**

** AEMB is free software: you can redistribute it and/or modify it

** under the terms of the GNU Lesser General Public License as

** published by the Free Software Foundation, either version 3 of the

** License, or (at your option) any later version.

**

** AEMB 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 Lesser General

** Public License for more details.

**

** You should have received a copy of the GNU Lesser General Public

** License along with AEMB. If not, see .

*/

/**

   Basic stack related functions

   @file stack.hh

 */

#ifndef AEMB_STACK_HH

#define AEMB_STACK_HH

namespace aemb {

  /**

  Reads the size of the memory space allocated for the stack in bytes.

  @return size of stack

  */

  inline int getStackSize()

  {

    int tmp;

    asm ("la %0, r0, _STACK_SIZE":"=r"(tmp));

    return tmp;

  }

  /**

  Reads the end of the memory space allocated for the stack. This is

  where the stack ends.

  @return end of stack

  */

  inline int getStackEnd()

  {

    int tmp;

    asm ("la %0, r0, _stack_end":"=r"(tmp));

    return tmp;

  }

  /**

  Reads the top of the memory space allocated for the stack. This is

  where the stack starts.

  @return top of stack

  */

  inline int getStackTop()

  {

    int tmp;

    asm ("la %0, r0, _stack":"=r"(tmp));

    return tmp;

  }

  /**

  Reads register R1 which is the designated stack pointer.

  @return stack pointer

  */

  inline int getStack()

  {

    int tmp;

    asm ("addk %0, r0, r1":"=r"(tmp));

    return tmp;

  }

  /**

  Sets register R1 to the new stack pointer.

  @param stk new stack pointer

  @return new stack pointer

  */

  inline int setStack(int stk)

  {

    asm ("addk r1, r0, %0"::"r"(stk));

    return stk;

  }

  /**

     Duplicates the stack

     @param newp new stack pointer

     @param oldp old stack pointer

     @param endp end of the stack

  */

  inline void dupStack(int *newp, int *oldp, int *endp)

  {

    while (oldp < endp)

      {

        // copy the stack content

        *newp = *oldp;

        // this increments 1 word (not 1 byte)

        newp++;

        oldp++;

      }

  }

}

#endif

/*

  $Log: not supported by cvs2svn $

  Revision 1.3  2008/04/23 14:19:39  sybreon

  Fixed minor bugs.

  Initial use of hardware mutex.

  Revision 1.2  2008/04/20 16:35:53  sybreon

  Added C/C++ compatible #ifdef statements

  Revision 1.1  2008/04/09 19:48:37  sybreon

  Added new C++ files

*/