system.cc revision 8229:78bf55f23338 
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#include "arch/x86/linux/system.hh"
41#include "arch/x86/regs/int.hh"
42#include "arch/x86/isa_traits.hh"
43#include "arch/vtophys.hh"
44#include "base/trace.hh"
45#include "cpu/thread_context.hh"
46#include "mem/physical.hh"
47#include "params/LinuxX86System.hh"
48#include "sim/byteswap.hh"
49
50using namespace LittleEndianGuest;
51using namespace X86ISA;
52
53LinuxX86System::LinuxX86System(Params *p)
54    : X86System(p), commandLine(p->boot_osflags), e820Table(p->e820_table)
55{
56}
57
58LinuxX86System::~LinuxX86System()
59{
60}
61
62void
63LinuxX86System::initState()
64{
65    X86System::initState();
66
67    // The location of the real mode data structure.
68    const Addr realModeData = 0x90200;
69
70    // A port to write to memory.
71    FunctionalPort * physPort = threadContexts[0]->getPhysPort();
72
73    /*
74     * Deal with the command line stuff.
75     */
76
77    // A buffer to store the command line.
78    const Addr commandLineBuff = 0x90000;
79    // A pointer to the commandLineBuff stored in the real mode data.
80    const Addr commandLinePointer = realModeData + 0x228;
81
82    if (commandLine.length() + 1 > realModeData - commandLineBuff)
83        panic("Command line \"%s\" is longer than %d characters.\n",
84                commandLine, realModeData - commandLineBuff - 1);
85    physPort->writeBlob(commandLineBuff,
86            (uint8_t *)commandLine.c_str(), commandLine.length() + 1);
87
88    // Generate a pointer of the right size and endianness to put into
89    // commandLinePointer.
90    uint32_t guestCommandLineBuff =
91        X86ISA::htog((uint32_t)commandLineBuff);
92    physPort->writeBlob(commandLinePointer,
93            (uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));
94
95    /*
96     * Screen Info.
97     */
98
99    // We'll skip on this for now because it's only needed for framebuffers,
100    // something we don't support at the moment.
101
102    /*
103     * EDID info
104     */
105
106    // Skipping for now.
107
108    /*
109     * Saved video mode
110     */
111
112    // Skipping for now.
113
114    /*
115     * Loader type.
116     */
117
118    // Skipping for now.
119
120    /*
121     * E820 memory map
122     */
123
124    // A pointer to the number of E820 entries there are.
125    const Addr e820MapNrPointer = realModeData + 0x1e8;
126
127    // A pointer to the buffer for E820 entries.
128    const Addr e820MapPointer = realModeData + 0x2d0;
129
130    e820Table->writeTo(physPort, e820MapNrPointer, e820MapPointer);
131
132    /*
133     * Pass the location of the real mode data structure to the kernel
134     * using register %esi. We'll use %rsi which should be equivalent.
135     */
136    threadContexts[0]->setIntReg(INTREG_RSI, realModeData);
137}
138
139LinuxX86System *
140LinuxX86SystemParams::create()
141{
142    return new LinuxX86System(this);
143}
144