system.cc revision 7737 
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/isa_traits.hh"
41#include "arch/x86/linux/system.hh"
42#include "arch/x86/regs/int.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
50
51using namespace LittleEndianGuest;
52using namespace X86ISA;
53
54LinuxX86System::LinuxX86System(Params *p)
55    : X86System(p), commandLine(p->boot_osflags), e820Table(p->e820_table)
56{
57}
58
59LinuxX86System::~LinuxX86System()
60{
61}
62
63void
64LinuxX86System::initState()
65{
66    X86System::initState();
67
68    // The location of the real mode data structure.
69    const Addr realModeData = 0x90200;
70
71    // A port to write to memory.
72    FunctionalPort * physPort = threadContexts[0]->getPhysPort();
73
74    /*
75     * Deal with the command line stuff.
76     */
77
78    // A buffer to store the command line.
79    const Addr commandLineBuff = 0x90000;
80    // A pointer to the commandLineBuff stored in the real mode data.
81    const Addr commandLinePointer = realModeData + 0x228;
82
83    if (commandLine.length() + 1 > realModeData - commandLineBuff)
84        panic("Command line \"%s\" is longer than %d characters.\n",
85                commandLine, realModeData - commandLineBuff - 1);
86    physPort->writeBlob(commandLineBuff,
87            (uint8_t *)commandLine.c_str(), commandLine.length() + 1);
88
89    // Generate a pointer of the right size and endianness to put into
90    // commandLinePointer.
91    uint32_t guestCommandLineBuff =
92        X86ISA::htog((uint32_t)commandLineBuff);
93    physPort->writeBlob(commandLinePointer,
94            (uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));
95
96    /*
97     * Screen Info.
98     */
99
100    // We'll skip on this for now because it's only needed for framebuffers,
101    // something we don't support at the moment.
102
103    /*
104     * EDID info
105     */
106
107    // Skipping for now.
108
109    /*
110     * Saved video mode
111     */
112
113    // Skipping for now.
114
115    /*
116     * Loader type.
117     */
118
119    // Skipping for now.
120
121    /*
122     * E820 memory map
123     */
124
125    // A pointer to the number of E820 entries there are.
126    const Addr e820MapNrPointer = realModeData + 0x1e8;
127
128    // A pointer to the buffer for E820 entries.
129    const Addr e820MapPointer = realModeData + 0x2d0;
130
131    e820Table->writeTo(physPort, e820MapNrPointer, e820MapPointer);
132
133    /*
134     * Pass the location of the real mode data structure to the kernel
135     * using register %esi. We'll use %rsi which should be equivalent.
136     */
137    threadContexts[0]->setIntReg(INTREG_RSI, realModeData);
138}
139
140LinuxX86System *
141LinuxX86SystemParams::create()
142{
143    return new LinuxX86System(this);
144}
145