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os-k/kaleid/kernel/ke/cpuid.c

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: CPU detection //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
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#include <ke/cpuid.h>
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#include <ke/time.h>
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#include <io/vga.h>
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void KeGetCpuInfos(void)
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{
uint CpuVendorString[5] = {0};
extern CpuInfo_t CpuInfo;
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uint eax = 0;
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CpuCpuidString(0, CpuVendorString);
memmove(CpuInfo.vendorStr, (char *)&CpuVendorString[1], 12*sizeof(char));
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CpuCpuid(1, &eax, &CpuInfo.featureFlag);
if (CpuInfo.featureFlag & FEAT_EDX_SSE) {
KeActivateSSE();
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CpuInfo.frequency = KeGetCpuFrequency();
}
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DebugLog("\tCPU %s %#d KHz detected with features %#x\n",
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CpuInfo.vendorStr,
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(long)(CpuInfo.frequency / 1000.0),
CpuInfo.featureFlag
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);
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}
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double KeGetCpuFrequency(void)
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{
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ulong first = CpuRdtsc();
KeSleep(300);
ulong second = CpuRdtsc();
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return ((double)(second) - (double)(first)) / 300.0;
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}
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