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 Declaration. 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_impl.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 a thread 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
  53 class VirtualPort  : public FunctionalPort
  54 {
  55   private:
  56     ThreadContext *tc;
  57
  58   public:
  59     VirtualPort(const std::string &_name, ThreadContext *_tc = NULL)
  60         : FunctionalPort(_name), tc(_tc)
  61     {}
  62
  63     /** Return true if we have an thread context. This is used to
  64      * prevent someone from accidently deleting the cpus statically
  65      * allocated vport.
  66      * @return true if a thread context isn't valid
  67      */
  68     bool nullThreadContext() { return tc != NULL; }
  69
  70     /** Version of readblob that translates virt->phys and deals
  71       * with page boundries. */
  72     virtual void readBlob(Addr addr, uint8_t *p, int size);
  73
  74     /** Version of writeBlob that translates virt->phys and deals
  75       * with page boundries. */
  76     virtual void writeBlob(Addr addr, uint8_t *p, int size);
  77 };
  78
  79
  80 void CopyOut(ThreadContext *tc, void *dest, Addr src, size_t cplen);
  81 void CopyIn(ThreadContext *tc, Addr dest, void *source, size_t cplen);
  82 void CopyStringOut(ThreadContext *tc, char *dst, Addr vaddr, size_t maxlen);
  83 void CopyStringIn(ThreadContext *tc, char *src, Addr vaddr);
  84
  85 #endif //__MEM_VPORT_HH__
  86