src/mem/vport.hh

   1 /*
   2  * Copyright (c) 2006 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Ali Saidi
  29  */
  30
  31 /**
  32  * @file
  33  * Virtual Port Object Decleration. These ports incorporate some translation
  34  * into their access methods. Thus you can use one to read and write data
  35  * to/from virtual addresses.
  36  */
  37
  38 #ifndef __MEM_VPORT_HH__
  39 #define __MEM_VPORT_HH__
  40
  41 #include "mem/port.hh"
  42 #include "config/full_system.hh"
  43 #include "arch/vtophys.hh"
  44
  45
  46 /** A class that translates a virtual address to a physical address and then
  47  * calls the above read/write functions. If an execution context is provided the
  48  * address can alway be translated, If not it can only be translated if it is a
  49  * simple address masking operation (such as alpha super page accesses).
  50  */
  51
  52 class VirtualPort  : public FunctionalPort
  53 {
  54   private:
  55     ExecContext *xc;
  56
  57   public:
  58     VirtualPort(const std::string &_name, ExecContext *_xc = NULL)
  59         : FunctionalPort(_name), xc(_xc)
  60     {}
  61
  62     /** Return true if we have an exec context. This is used to prevent someone
  63      * from accidently deleting the cpus statically allocated vport.
  64      * @return true if an execution context isn't valid
  65      */
  66     bool nullExecContext() { return xc != NULL; }
  67
  68     /** Version of readblob that translates virt->phys and deals
  69       * with page boundries. */
  70     virtual void readBlob(Addr addr, uint8_t *p, int size);
  71
  72     /** Version of writeBlob that translates virt->phys and deals
  73       * with page boundries. */
  74     virtual void writeBlob(Addr addr, uint8_t *p, int size);
  75 };
  76
  77 #endif //__MEM_VPORT_HH__
  78