src/arch/x86/mmapped_ipr.hh

   1 /*
   2  * Copyright (c) 2007-2008 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 #ifndef __ARCH_X86_MMAPPEDIPR_HH__
  41 #define __ARCH_X86_MMAPPEDIPR_HH__
  42
  43 /**
  44  * @file
  45  *
  46  * ISA-specific helper functions for memory mapped IPR accesses.
  47  */
  48
  49 #include "arch/generic/mmapped_ipr.hh"
  50 #include "arch/x86/regs/misc.hh"
  51 #include "cpu/base.hh"
  52 #include "cpu/thread_context.hh"
  53 #include "mem/packet.hh"
  54
  55 namespace X86ISA
  56 {
  57     inline Cycles
  58     handleIprRead(ThreadContext *xc, Packet *pkt)
  59     {
  60         if (GenericISA::isGenericIprAccess(pkt)) {
  61             return GenericISA::handleGenericIprRead(xc, pkt);
  62         } else {
  63             Addr offset = pkt->getAddr() & mask(3);
  64             MiscRegIndex index = (MiscRegIndex)(
  65                 pkt->getAddr() / sizeof(MiscReg));
  66             MiscReg data = htog(xc->readMiscReg(index));
  67             // Make sure we don't trot off the end of data.
  68             assert(offset + pkt->getSize() <= sizeof(MiscReg));
  69             pkt->setData(((uint8_t *)&data) + offset);
  70             return Cycles(1);
  71         }
  72     }
  73
  74     inline Cycles
  75     handleIprWrite(ThreadContext *xc, Packet *pkt)
  76     {
  77         if (GenericISA::isGenericIprAccess(pkt)) {
  78             return GenericISA::handleGenericIprWrite(xc, pkt);
  79         } else {
  80             Addr offset = pkt->getAddr() & mask(3);
  81             MiscRegIndex index = (MiscRegIndex)(
  82                 pkt->getAddr() / sizeof(MiscReg));
  83             MiscReg data;
  84             data = htog(xc->readMiscRegNoEffect(index));
  85             // Make sure we don't trot off the end of data.
  86             assert(offset + pkt->getSize() <= sizeof(MiscReg));
  87             pkt->writeData(((uint8_t *)&data) + offset);
  88             xc->setMiscReg(index, gtoh(data));
  89             return Cycles(1);
  90         }
  91     }
  92 }
  93
  94 #endif // __ARCH_X86_MMAPPEDIPR_HH__