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Diffstat (limited to 'dxr3cpu.c')
| -rw-r--r-- | dxr3cpu.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/dxr3cpu.c b/dxr3cpu.c new file mode 100644 index 0000000..4666e89 --- /dev/null +++ b/dxr3cpu.c @@ -0,0 +1,127 @@ +/* +* dxr3cpu.c +* +* Copyright (C) 2004 Christian Gmeiner +* +* Taken from Nesseia-Renderengine Copyright (C) 2003-2004 Christian Gmeiner +* +* This program is free software; you can redistribute it and/or +* modify it under the terms of the GNU Lesser General Public License +* as published by the Free Software Foundation; either version 2.1 +* of the License, or (at your option) any later version. +* +* This program 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 Lesser General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +* +*/ + +#include "dxr3cpu.h" +#include "dxr3log.h" +#include "dxr3memcpy.h" + +// ================================== +// const. +cDxr3CPU::cDxr3CPU() +{ + unsigned long eax,ebx,edx,unused; + + // readout the vendor + cpuid(0,eax,ebx,unused,edx); + + // set Vendor to "" + memset(m_Info.Vendor, 0, 16); + + // connect the single register values to the vendor string + // maybe there is an better solution - i will google :) + *(unsigned long *)(m_Info.Vendor) = ebx; + *(unsigned long *)(m_Info.Vendor + 4) = edx; + *(unsigned long *)(m_Info.Vendor + 8) = unused; + + // check the features + // could we get the needed infos? + if (cpuid(1,eax,ebx,unused,edx)) + { + m_Info.MMX = ((edx & 1<<23) != 0); + m_Info.SSE = ((edx & 1<<25) != 0); + m_Info.SSE2= ((edx & 1<<26) != 0); + m_Info.RDTSC=((edx & 1<<4) != 0); /*0x10*/ + m_Info.HT = ((edx & 1<<28) !=0); // should we do here addinonal checks? + + // 3DNow is a litle bit harder to read out + // We read the ext. CPUID level 0x80000000 + if (cpuid(0x80000000,eax,ebx,unused,edx)) + { + // now in eax there is the max. supported extended CPUID level + // we check if theres an extended CPUID level support + if (eax >= 0x80000001) + { + // If we can access the extended CPUID level 0x80000001 we get the + // edx register + if (cpuid(0x80000001,eax,ebx,unused,edx)) + { + // Now we can mask some AMD specific cpu extensions + // 22 ... Extended MMX_MultimediaExtensions + m_Info.MMXEXT = ((edx & 1<<22) != 0); + m_Info.AMD64Bit = ((edx & 1<<29) != 0); + // 30 ... Extended 3DNOW_InstructionExtensions + m_Info.Now = ((edx & (1<<31)) != 0); + } + } + } + } + + // fill cabs + if (m_Info.MMX) + { + m_Info.caps = CC_MMX; + } + + if (m_Info.MMXEXT) + { + m_Info.caps |= CC_MMXEXT; + } + + if (m_Info.SSE) + { + m_Info.caps |= CC_SSE; + } + + if (m_Info.Now) + { + m_Info.caps |= CC_3DNOW; + } + + // print some infos about cpu + cLog::Instance() << "cpu vandor: " << m_Info.Vendor << "\n"; + cLog::Instance() << "cpu extensions:\n"; + cLog::Instance() << "mmx: " << m_Info.MMX << "\n"; + cLog::Instance() << "mmx-ext: " << m_Info.MMXEXT << "\n"; + cLog::Instance() << "sse: " << m_Info.SSE << "\n"; + cLog::Instance() << "sse2: " << m_Info.SSE2 << "\n"; + cLog::Instance() << "3dnow: " << m_Info.Now << "\n"; + + // now we select the best memcpy mehtode + cDxr3MemcpyBench Benchmark(m_Info.caps); +} + +// ================================== +// does the cpu support cpuid instructions +bool cDxr3CPU::CheckCPUIDPresence() +{ + // todo + return true; +} + +// ================================== +// cpuid function +bool cDxr3CPU::cpuid(unsigned long function, unsigned long& out_eax, unsigned long& out_ebx, unsigned long& out_ecx, unsigned long& out_edx) +{ + asm("cpuid": "=a" (out_eax), "=b" (out_ebx), "=c" (out_ecx), "=d" (out_edx) : "a" (function)); + return true; +} |