cpuid.cc revision 14165:44b5b61846e1 
1/*
2 * Copyright (c) 2008 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Gabe Black
29 */
30
31#include "arch/x86/cpuid.hh"
32
33#include "base/bitfield.hh"
34#include "cpu/thread_context.hh"
35
36namespace X86ISA {
37    enum StandardCpuidFunction {
38        VendorAndLargestStdFunc,
39        FamilyModelStepping,
40        CacheAndTLB,
41        SerialNumber,
42        CacheParams,
43        MonitorMwait,
44        ThermalPowerMgmt,
45        ExtendedFeatures,
46        NumStandardCpuidFuncs
47    };
48
49    enum ExtendedCpuidFunctions {
50        VendorAndLargestExtFunc,
51        FamilyModelSteppingBrandFeatures,
52        NameString1,
53        NameString2,
54        NameString3,
55        L1CacheAndTLB,
56        L2L3CacheAndL2TLB,
57        APMInfo,
58        LongModeAddressSize,
59
60        /*
61         * The following are defined by the spec but not yet implemented
62         */
63/*      // Function 9 is reserved
64        SVMInfo = 10,
65        // Functions 11-24 are reserved
66        TLB1GBPageInfo = 25,
67        PerformanceInfo,*/
68
69        NumExtendedCpuidFuncs
70    };
71
72    static const int vendorStringSize = 13;
73    static const char vendorString[vendorStringSize] = "M5 Simulator";
74    static const int nameStringSize = 48;
75    static const char nameString[nameStringSize] = "Fake M5 x86_64 CPU";
76
77    uint64_t
78    stringToRegister(const char *str)
79    {
80        uint64_t reg = 0;
81        for (int pos = 3; pos >=0; pos--) {
82            reg <<= 8;
83            reg |= str[pos];
84        }
85        return reg;
86    }
87
88    bool
89    doCpuid(ThreadContext * tc, uint32_t function,
90            uint32_t index, CpuidResult &result)
91    {
92        uint16_t family = bits(function, 31, 16);
93        uint16_t funcNum = bits(function, 15, 0);
94        if (family == 0x8000) {
95            // The extended functions
96            switch (funcNum) {
97              case VendorAndLargestExtFunc:
98                assert(vendorStringSize >= 12);
99                result = CpuidResult(
100                        0x80000000 + NumExtendedCpuidFuncs - 1,
101                        stringToRegister(vendorString),
102                        stringToRegister(vendorString + 4),
103                        stringToRegister(vendorString + 8));
104                break;
105              case FamilyModelSteppingBrandFeatures:
106                result = CpuidResult(0x00020f51, 0x00000405,
107                                     0xe3d3fbff, 0x00000001);
108                break;
109              case NameString1:
110              case NameString2:
111              case NameString3:
112                {
113                    // Zero fill anything beyond the end of the string. This
114                    // should go away once the string is a vetted parameter.
115                    char cleanName[nameStringSize];
116                    memset(cleanName, '\0', nameStringSize);
117                    strncpy(cleanName, nameString, nameStringSize);
118
119                    int offset = (funcNum - NameString1) * 16;
120                    assert(nameStringSize >= offset + 16);
121                    result = CpuidResult(
122                            stringToRegister(cleanName + offset + 0),
123                            stringToRegister(cleanName + offset + 4),
124                            stringToRegister(cleanName + offset + 12),
125                            stringToRegister(cleanName + offset + 8));
126                }
127                break;
128              case L1CacheAndTLB:
129                result = CpuidResult(0xff08ff08, 0xff20ff20,
130                                     0x40020140, 0x40020140);
131                break;
132              case L2L3CacheAndL2TLB:
133                result = CpuidResult(0x00000000, 0x42004200,
134                                     0x00000000, 0x04008140);
135                break;
136              case APMInfo:
137                result = CpuidResult(0x80000018, 0x68747541,
138                                     0x69746e65, 0x444d4163);
139                break;
140              case LongModeAddressSize:
141                result = CpuidResult(0x00003030, 0x00000000,
142                                     0x00000000, 0x00000000);
143                break;
144/*            case SVMInfo:
145              case TLB1GBPageInfo:
146              case PerformanceInfo:*/
147              default:
148                warn("x86 cpuid family 0x8000: unimplemented function %u",
149                    funcNum);
150                return false;
151            }
152        } else if (family == 0x0000) {
153            // The standard functions
154            switch (funcNum) {
155              case VendorAndLargestStdFunc:
156                assert(vendorStringSize >= 12);
157                result = CpuidResult(
158                        NumStandardCpuidFuncs - 1,
159                        stringToRegister(vendorString),
160                        stringToRegister(vendorString + 4),
161                        stringToRegister(vendorString + 8));
162                break;
163              case FamilyModelStepping:
164                result = CpuidResult(0x00020f51, 0x00000805,
165                                     0xe7dbfbff, 0x00000209);
166                break;
167              case ExtendedFeatures:
168                result = CpuidResult(0x00000000, 0x01800000,
169                                     0x00000000, 0x00000000);
170                break;
171              default:
172                warn("x86 cpuid family 0x0000: unimplemented function %u",
173                    funcNum);
174                return false;
175            }
176        } else {
177            warn("x86 cpuid: unknown family %#x", family);
178            return false;
179        }
180
181        return true;
182    }
183} // namespace X86ISA
184