src/arch/x86/bios/e820.cc

   1 /*
   2  * Copyright (c) 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 #include "arch/x86/bios/e820.hh"
  41
  42 #include "arch/x86/isa_traits.hh"
  43 #include "mem/port_proxy.hh"
  44 #include "sim/byteswap.hh"
  45
  46 using namespace std;
  47 using namespace X86ISA;
  48
  49 template<class T>
  50 void writeVal(T val, PortProxy& proxy, Addr &addr)
  51 {
  52     T guestVal = htole(val);
  53     proxy.writeBlob(addr, &guestVal, sizeof(T));
  54     addr += sizeof(T);
  55 }
  56
  57 void X86ISA::E820Table::writeTo(PortProxy& proxy, Addr countAddr, Addr addr)
  58 {
  59     uint8_t e820Nr = entries.size();
  60
  61     // Make sure the number of entries isn't bigger than what the kernel
  62     // would be capable of handling.
  63     assert(e820Nr <= 128);
  64
  65     uint8_t guestE820Nr = htole(e820Nr);
  66
  67     proxy.writeBlob(countAddr, &guestE820Nr, sizeof(guestE820Nr));
  68
  69     for (int i = 0; i < e820Nr; i++) {
  70         writeVal(entries[i]->addr, proxy, addr);
  71         writeVal(entries[i]->size, proxy, addr);
  72         writeVal(entries[i]->type, proxy, addr);
  73     }
  74 }
  75
  76 E820Table *
  77 X86E820TableParams::create()
  78 {
  79     return new E820Table(this);
  80 }
  81
  82 E820Entry *
  83 X86E820EntryParams::create()
  84 {
  85     return new E820Entry(this);
  86 }