src/arch/alpha/vtophys.cc

   1 /*
   2  * Copyright (c) 2002-2005 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: Nathan Binkert
  29  *          Steve Reinhardt
  30  *          Ali Saidi
  31  */
  32
  33 #include "arch/alpha/vtophys.hh"
  34
  35 #include <string>
  36
  37 #include "arch/alpha/ev5.hh"
  38 #include "base/chunk_generator.hh"
  39 #include "base/trace.hh"
  40 #include "cpu/thread_context.hh"
  41 #include "debug/VtoPhys.hh"
  42 #include "mem/port_proxy.hh"
  43
  44 using namespace std;
  45
  46 namespace AlphaISA {
  47
  48 PageTableEntry
  49 kernel_pte_lookup(PortProxy &mem, Addr ptbr, VAddr vaddr)
  50 {
  51     Addr level1_pte = ptbr + vaddr.level1();
  52     PageTableEntry level1 = mem.read<uint64_t>(level1_pte);
  53     if (!level1.valid()) {
  54         DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
  55         return 0;
  56     }
  57
  58     Addr level2_pte = level1.paddr() + vaddr.level2();
  59     PageTableEntry level2 = mem.read<uint64_t>(level2_pte);
  60     if (!level2.valid()) {
  61         DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
  62         return 0;
  63     }
  64
  65     Addr level3_pte = level2.paddr() + vaddr.level3();
  66     PageTableEntry level3 = mem.read<uint64_t>(level3_pte);
  67     if (!level3.valid()) {
  68         DPRINTF(VtoPhys, "level 3 PTE not valid, va = %#x\n", vaddr);
  69         return 0;
  70     }
  71     return level3;
  72 }
  73
  74 Addr
  75 vtophys(Addr vaddr)
  76 {
  77     Addr paddr = 0;
  78     if (IsUSeg(vaddr))
  79         DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
  80     else if (IsK0Seg(vaddr))
  81         paddr = K0Seg2Phys(vaddr);
  82     else
  83         panic("vtophys: ptbr is not set on virtual lookup");
  84
  85     DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
  86
  87     return paddr;
  88 }
  89
  90 Addr
  91 vtophys(ThreadContext *tc, Addr addr)
  92 {
  93     VAddr vaddr = addr;
  94     Addr ptbr = tc->readMiscRegNoEffect(IPR_PALtemp20);
  95     Addr paddr = 0;
  96     //@todo Andrew couldn't remember why he commented some of this code
  97     //so I put it back in. Perhaps something to do with gdb debugging?
  98     if (PcPAL(vaddr) && (vaddr < PalMax)) {
  99         paddr = vaddr & ~ULL(1);
 100     } else {
 101         if (IsK0Seg(vaddr)) {
 102             paddr = K0Seg2Phys(vaddr);
 103         } else if (!ptbr) {
 104             paddr = vaddr;
 105         } else {
 106             PageTableEntry pte =
 107                 kernel_pte_lookup(tc->getPhysProxy(), ptbr, vaddr);
 108             if (pte.valid())
 109                 paddr = pte.paddr() | vaddr.offset();
 110         }
 111     }
 112
 113
 114     DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
 115
 116     return paddr;
 117 }
 118
 119 } // namespace AlphaISA