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/*
* Copyright (c) 2008 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#include "arch/x86/cpuid.hh"
#include "base/bitfield.hh"
#include "cpu/thread_context.hh"
namespace X86ISA {
enum StandardCpuidFunction {
VendorAndLargestStdFunc,
FamilyModelStepping,
NumStandardCpuidFuncs
};
enum ExtendedCpuidFunctions {
VendorAndLargestExtFunc,
FamilyModelSteppingBrandFeatures,
NameString1,
NameString2,
NameString3,
L1CacheAndTLB,
L2L3CacheAndL2TLB,
APMInfo,
LongModeAddressSize,
/*
* The following are defined by the spec but not yet implemented
*/
/* // Function 9 is reserved
SVMInfo = 10,
// Functions 11-24 are reserved
TLB1GBPageInfo = 25,
PerformanceInfo,*/
NumExtendedCpuidFuncs
};
static const int vendorStringSize = 13;
static const char vendorString[vendorStringSize] = "M5 Simulator";
static const int nameStringSize = 48;
static const char nameString[nameStringSize] = "Fake M5 x86_64 CPU";
uint64_t
stringToRegister(const char *str)
{
uint64_t reg = 0;
for (int pos = 3; pos >=0; pos--) {
reg <<= 8;
reg |= str[pos];
}
return reg;
}
bool
doCpuid(ThreadContext * tc, uint32_t function,
uint32_t index, CpuidResult &result)
{
uint16_t family = bits(function, 31, 16);
uint16_t funcNum = bits(function, 15, 0);
if (family == 0x8000) {
// The extended functions
switch (funcNum) {
case VendorAndLargestExtFunc:
assert(vendorStringSize >= 12);
result = CpuidResult(
0x80000000 + NumExtendedCpuidFuncs - 1,
stringToRegister(vendorString),
stringToRegister(vendorString + 4),
stringToRegister(vendorString + 8));
break;
case FamilyModelSteppingBrandFeatures:
result = CpuidResult(0x00020f51, 0x00000405,
0xe3d3fbff, 0x00000001);
break;
case NameString1:
case NameString2:
case NameString3:
{
// Zero fill anything beyond the end of the string. This
// should go away once the string is a vetted parameter.
char cleanName[nameStringSize];
memset(cleanName, '\0', nameStringSize);
strncpy(cleanName, nameString, nameStringSize);
int offset = (funcNum - NameString1) * 16;
assert(nameStringSize >= offset + 16);
result = CpuidResult(
stringToRegister(cleanName + offset + 0),
stringToRegister(cleanName + offset + 4),
stringToRegister(cleanName + offset + 12),
stringToRegister(cleanName + offset + 8));
}
break;
case L1CacheAndTLB:
result = CpuidResult(0xff08ff08, 0xff20ff20,
0x40020140, 0x40020140);
break;
case L2L3CacheAndL2TLB:
result = CpuidResult(0x00000000, 0x42004200,
0x00000000, 0x04008140);
break;
case APMInfo:
result = CpuidResult(0x80000018, 0x68747541,
0x69746e65, 0x444d4163);
break;
case LongModeAddressSize:
result = CpuidResult(0x0000ffff, 0x00000000,
0x00000000, 0x00000000);
break;
/* case SVMInfo:
case TLB1GBPageInfo:
case PerformanceInfo:*/
default:
warn("x86 cpuid: unimplemented function %u", funcNum);
return false;
}
} else if(family == 0x0000) {
// The standard functions
switch (funcNum) {
case VendorAndLargestStdFunc:
assert(vendorStringSize >= 12);
result = CpuidResult(
NumStandardCpuidFuncs - 1,
stringToRegister(vendorString),
stringToRegister(vendorString + 4),
stringToRegister(vendorString + 8));
break;
case FamilyModelStepping:
result = CpuidResult(0x00020f51, 0x00000805,
0xe7dbfbff, 0x00000001);
break;
default:
warn("x86 cpuid: unimplemented function %u", funcNum);
return false;
}
} else {
warn("x86 cpuid: unknown family %#x", family);
return false;
}
return true;
}
} // namespace X86ISA
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