system.cc revision 5303:ee44ea10f32f 
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use of this software in source and binary forms,
6 * with or without modification, are permitted provided that the
7 * following conditions are met:
8 *
9 * The software must be used only for Non-Commercial Use which means any
10 * use which is NOT directed to receiving any direct monetary
11 * compensation for, or commercial advantage from such use.  Illustrative
12 * examples of non-commercial use are academic research, personal study,
13 * teaching, education and corporate research & development.
14 * Illustrative examples of commercial use are distributing products for
15 * commercial advantage and providing services using the software for
16 * commercial advantage.
17 *
18 * If you wish to use this software or functionality therein that may be
19 * covered by patents for commercial use, please contact:
20 *     Director of Intellectual Property Licensing
21 *     Office of Strategy and Technology
22 *     Hewlett-Packard Company
23 *     1501 Page Mill Road
24 *     Palo Alto, California  94304
25 *
26 * Redistributions of source code must retain the above copyright notice,
27 * this list of conditions and the following disclaimer.  Redistributions
28 * in binary form must reproduce the above copyright notice, this list of
29 * conditions and the following disclaimer in the documentation and/or
30 * other materials provided with the distribution.  Neither the name of
31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
32 * contributors may be used to endorse or promote products derived from
33 * this software without specific prior written permission.  No right of
34 * sublicense is granted herewith.  Derivatives of the software and
35 * output created using the software may be prepared, but only for
36 * Non-Commercial Uses.  Derivatives of the software may be shared with
37 * others provided: (i) the others agree to abide by the list of
38 * conditions herein which includes the Non-Commercial Use restrictions;
39 * and (ii) such Derivatives of the software include the above copyright
40 * notice to acknowledge the contribution from this software where
41 * applicable, this list of conditions and the disclaimer below.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 *
55 * Authors: Gabe Black
56 */
57
58#include "arch/x86/intregs.hh"
59#include "arch/x86/linux/system.hh"
60#include "arch/vtophys.hh"
61#include "base/trace.hh"
62#include "cpu/thread_context.hh"
63#include "mem/physical.hh"
64#include "params/LinuxX86System.hh"
65
66
67using namespace LittleEndianGuest;
68using namespace X86ISA;
69
70LinuxX86System::LinuxX86System(Params *p)
71    : X86System(p), commandLine(p->command_line)
72{
73}
74
75LinuxX86System::~LinuxX86System()
76{
77}
78
79void
80LinuxX86System::startup()
81{
82    X86System::startup();
83
84    // The location of the real mode data structure.
85    const Addr realModeData = 0x90200;
86
87    // A port to write to memory.
88    FunctionalPort * physPort = threadContexts[0]->getPhysPort();
89
90    /*
91     * Deal with the command line stuff.
92     */
93
94    // A buffer to store the command line.
95    const Addr commandLineBuff = 0x90000;
96    // A pointer to the commandLineBuff stored in the real mode data.
97    const Addr commandLinePointer = realModeData + 0x228;
98
99    if (commandLine.length() + 1 > realModeData - commandLineBuff)
100        panic("Command line \"%s\" is longer than %d characters.\n",
101                commandLine, realModeData - commandLineBuff - 1);
102    physPort->writeBlob(commandLineBuff,
103            (uint8_t *)commandLine.c_str(), commandLine.length() + 1);
104
105    // Generate a pointer of the right size and endianness to put into
106    // commandLinePointer.
107    uint32_t guestCommandLineBuff =
108        X86ISA::htog((uint32_t)commandLineBuff);
109    physPort->writeBlob(commandLinePointer,
110            (uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));
111
112    /*
113     * Screen Info.
114     */
115
116    // We'll skip on this for now because it's only needed for framebuffers,
117    // something we don't support at the moment.
118
119    /*
120     * EDID info
121     */
122
123    // Skipping for now.
124
125    /*
126     * Saved video mode
127     */
128
129    // Skipping for now.
130
131    /*
132     * Loader type.
133     */
134
135    // Skipping for now.
136
137    /*
138     * E820 memory map
139     */
140
141    // A pointer to the number of E820 entries there are.
142    const Addr e820MapNrPointer = realModeData + 0x1e8;
143
144    // A pointer to the buffer for E820 entries.
145    const Addr e820MapPointer = realModeData + 0x2d0;
146
147    struct e820Entry
148    {
149        Addr addr;
150        Addr size;
151        uint32_t type;
152    };
153
154    // The size is computed this way to ensure no padding sneaks in.
155    int e820EntrySize =
156        sizeof(e820Entry().addr) +
157        sizeof(e820Entry().size) +
158        sizeof(e820Entry().type);
159
160    // I'm not sure what these should actually be. On a real machine they
161    // would be generated by the BIOS, and they need to reflect the regions
162    // which are actually available/reserved. These values are copied from
163    // my development machine.
164    e820Entry e820Map[] = {
165        {ULL(0x0), ULL(0x9d400), 1},
166        {ULL(0x9d400), ULL(0xa0000) - ULL(0x9d400), 2},
167        {ULL(0xe8000), ULL(0x100000) - ULL(0xe8000), 2},
168        {ULL(0x100000), ULL(0xcfff9300) - ULL(0x100000), 1},
169        {ULL(0xcfff9300), ULL(0xd0000000) - ULL(0xcfff9300), 2},
170        {ULL(0xfec00000), ULL(0x100000000) - ULL(0xfec00000), 2}
171    };
172
173    uint8_t e820Nr = sizeof(e820Map) / sizeof(e820Entry);
174
175    // Make sure the number of entries isn't bigger than what the kernel
176    // would be capable of providing.
177    assert(e820Nr <= 128);
178
179    uint8_t guestE820Nr = X86ISA::htog(e820Nr);
180    physPort->writeBlob(e820MapNrPointer,
181            (uint8_t *)&guestE820Nr, sizeof(guestE820Nr));
182
183    for (int i = 0; i < e820Nr; i++) {
184        e820Entry guestE820Entry;
185        guestE820Entry.addr = X86ISA::htog(e820Map[i].addr);
186        guestE820Entry.size = X86ISA::htog(e820Map[i].size);
187        guestE820Entry.type = X86ISA::htog(e820Map[i].type);
188        physPort->writeBlob(e820MapPointer + e820EntrySize * i,
189                (uint8_t *)&guestE820Entry.addr,
190                sizeof(guestE820Entry.addr));
191        physPort->writeBlob(
192                e820MapPointer + e820EntrySize * i +
193                    sizeof(guestE820Entry.addr),
194                (uint8_t *)&guestE820Entry.size,
195                sizeof(guestE820Entry.size));
196        physPort->writeBlob(
197                e820MapPointer + e820EntrySize * i +
198                    sizeof(guestE820Entry.addr) +
199                    sizeof(guestE820Entry.size),
200                (uint8_t *)&guestE820Entry.type,
201                sizeof(guestE820Entry.type));
202    }
203
204    /*
205     * Pass the location of the real mode data structure to the kernel
206     * using register %esi. We'll use %rsi which should be equivalent.
207     */
208    threadContexts[0]->setIntReg(INTREG_RSI, realModeData);
209}
210
211LinuxX86System *
212LinuxX86SystemParams::create()
213{
214    return new LinuxX86System(this);
215}
216