src/arch/x86/vtophys.cc

   1 /*
   2  * Copyright (c) 2007 The Hewlett-Packard Development Company
   3  * All rights reserved.
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Authors: Gabe Black
  38  */
  39
  40 #include <string>
  41
  42 #include "arch/x86/pagetable_walker.hh"
  43 #include "arch/x86/tlb.hh"
  44 #include "arch/x86/vtophys.hh"
  45 #include "base/trace.hh"
  46 #include "config/full_system.hh"
  47 #include "cpu/thread_context.hh"
  48 #include "debug/VtoPhys.hh"
  49 #include "sim/fault_fwd.hh"
  50
  51 using namespace std;
  52
  53 namespace X86ISA
  54 {
  55     Addr
  56     vtophys(Addr vaddr)
  57     {
  58 #if FULL_SYSTEM
  59         panic("Need access to page tables\n");
  60 #endif
  61         return vaddr;
  62     }
  63
  64     Addr
  65     vtophys(ThreadContext *tc, Addr vaddr)
  66     {
  67 #if FULL_SYSTEM
  68         Walker *walker = tc->getDTBPtr()->getWalker();
  69         Addr size;
  70         Addr addr = vaddr;
  71         Fault fault = walker->startFunctional(tc, addr, size, BaseTLB::Read);
  72         if (fault != NoFault)
  73             panic("vtophys page walk returned fault\n");
  74         Addr masked_addr = vaddr & (size - 1);
  75         Addr paddr = addr | masked_addr;
  76         DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
  77         return paddr;
  78 #endif
  79         return vaddr;
  80     }
  81 }