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73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: CPU detection //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <ke/cpuid.h>
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#include <io/vga.h>
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void KeGetCpuInfos(void)
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{
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uint CpuVendorString[5] = {0};
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extern CpuInfo_t CpuInfo;
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uint eax = 0;
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CpuCpuidString(0, CpuVendorString);
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memmove(CpuInfo.vendorStr, (char *)&CpuVendorString[1], 12*sizeof(char));
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CpuCpuid(1, &eax, &CpuInfo.featureFlag);
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if (CpuInfo.featureFlag & FEAT_EDX_SSE) {
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KeActivateSSE();
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}
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DebugLog("\tCPU %s detected with features %#x and ?? speed %#d Hz ??\n",
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CpuInfo.vendorStr,
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CpuInfo.featureFlag,
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(long)KeGetCpuSpeed()
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);
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}
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double KeGetCpuSpeed(void)
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{
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ulong flags = KePauseIRQs();
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IoWriteByteOnPort(0x43,0x34); // set PIT channel 0 to single-shot mode
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IoWriteByteOnPort(0x40,0);
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IoWriteByteOnPort(0x40,0); // program the counter will be
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// 0x10000 - n after n ticks
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long stsc = KeReadStsc();
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for (int i=0x9000;i>0;i--);
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long etsc= KeReadStsc();
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IoWriteByteOnPort(0x43,0x04);
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char lo=IoReadByteFromPort(0x40);
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char hi=IoReadByteFromPort(0x40);
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KeRestoreIRQs(flags);
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ulong ticks = (0x10000 - (hi*256+lo));
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return (etsc-stsc)*1193180.0 / ticks;
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}
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