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<hr><h1>cpu_info.cpp</h1><a href="cpu__info_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2000, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025 
00026 <font class="preprocessor">#include "<a class="code" href="stdmisc_8h.html">stdmisc.h</a>"</font>
00027 
00028 <font class="preprocessor">#include "<a class="code" href="cpu__info_8h.html">nel/misc/cpu_info.h</a>"</font>
00029 
00030 
00031 <font class="keyword">namespace </font>NLMISC 
00032 {
00033 
00034 <font class="keyword">static</font> <font class="keywordtype">bool</font> <a class="code" href="namespaceNLMISC.html#a291">DetectMMX</a>(<font class="keywordtype">void</font>)
00035 {               
00036 <font class="preprocessor">        #ifdef NL_OS_WINDOWS            </font>
00037 <font class="preprocessor"></font>                <font class="keywordflow">if</font> (!CCpuInfo___::hasCPUID()) <font class="keywordflow">return</font> <font class="keyword">false</font>; <font class="comment">// cpuid not supported ...</font>
00038 
00039                 uint32 result = 0;
00040                 __asm
00041                 {
00042                          mov  eax,1
00043                          cpuid
00044                          test edx,0x800000  <font class="comment">// bit 23 = MMX instruction set</font>
00045                          je   noMMX
00046                          mov result, 1  
00047                         noMMX:
00048                 }
00049 
00050                 <font class="keywordflow">return</font> result == 1;
00051  
00052                 <font class="comment">// printf("mmx detected\n");</font>
00053 
00054 <font class="preprocessor">        #else</font>
00055 <font class="preprocessor"></font>                <font class="keywordflow">return</font> <font class="keyword">false</font>;
00056 <font class="preprocessor">        #endif</font>
00057 <font class="preprocessor"></font>}
00058 
00059 
00060 <font class="keyword">static</font> <font class="keywordtype">bool</font> <a class="code" href="namespaceNLMISC.html#a292">DetectSSE</a>(<font class="keywordtype">void</font>)
00061 {       
00062 <font class="preprocessor">        #ifdef NL_OS_WINDOWS</font>
00063 <font class="preprocessor"></font>                <font class="keywordflow">if</font> (!CCpuInfo___::hasCPUID()) <font class="keywordflow">return</font> <font class="keyword">false</font>; <font class="comment">// cpuid not supported ...</font>
00064 
00065                 uint32 result = 0;
00066                 __asm
00067                 {                       
00068                         mov eax, 1   <font class="comment">// request for feature flags</font>
00069                         cpuid                                                   
00070                         test EDX, 002000000h   <font class="comment">// bit 25 in feature flags equal to 1</font>
00071                         je noSSE
00072                         mov result, 1  <font class="comment">// sse detected</font>
00073                 noSSE:
00074                 }
00075 
00076 
00077                 <font class="keywordflow">if</font> (result)
00078                 {
00079                         <font class="comment">// check OS support for SSE</font>
00080                         <font class="keywordflow">try</font> 
00081                         {
00082                                 __asm
00083                                 {
00084                                         xorps xmm0, xmm0  <font class="comment">// Streaming SIMD Extension</font>
00085                                 }
00086                         }
00087                         <font class="keywordflow">catch</font>(...)
00088                         {
00089                                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00090                         }
00091                 
00092                         <font class="comment">// printf("sse detected\n");</font>
00093 
00094                         <font class="keywordflow">return</font> <font class="keyword">true</font>;
00095                 }
00096                 <font class="keywordflow">else</font>
00097                 {
00098                         <font class="keywordflow">return</font> <font class="keyword">false</font>;
00099                 }
00100 <font class="preprocessor">        #else</font>
00101 <font class="preprocessor"></font>                <font class="keywordflow">return</font> <font class="keyword">false</font>;
00102 <font class="preprocessor">        #endif</font>
00103 <font class="preprocessor"></font>}
00104 
00105 <font class="keywordtype">bool</font> <a class="code" href="namespaceNLMISC.html#a188">HasMMX</a> = <a class="code" href="namespaceNLMISC.html#a291">DetectMMX</a>();
00106 <font class="keywordtype">bool</font> <a class="code" href="namespaceNLMISC.html#a189">HasSSE</a> = <a class="code" href="namespaceNLMISC.html#a292">DetectSSE</a>();
00107 
<a name="l00108"></a><a class="code" href="structNLMISC_1_1CCpuInfo______.html#d0">00108</a> <font class="keywordtype">bool</font> CCpuInfo___::hasCPUID(<font class="keywordtype">void</font>)
00109 {
00110 <font class="preprocessor">        #ifdef NL_OS_WINDOWS</font>
00111 <font class="preprocessor"></font>                 uint32 result;
00112                  __asm
00113                  {
00114                          pushad
00115                          pushfd                                         
00116                          <font class="comment">//      If ID bit of EFLAGS can change, then cpuid is available</font>
00117                          pushfd
00118                          pop  eax                                       <font class="comment">// Get EFLAG</font>
00119                          mov  ecx,eax
00120                          xor  eax,0x200000                      <font class="comment">// Flip ID bit</font>
00121                          push eax
00122                          popfd                                          <font class="comment">// Write EFLAGS</font>
00123                          pushfd      
00124                          pop  eax                                       <font class="comment">// read back EFLAG</font>
00125                          xor  eax,ecx                           
00126                          je   noCpuid                           <font class="comment">// no flip -&gt; no CPUID instr.</font>
00127                          
00128                          popfd                                          <font class="comment">// restore state</font>
00129                          popad
00130                          mov  result, 1
00131                          jmp  CPUIDPresent
00132                 
00133                         noCpuid:
00134                          popfd                                      <font class="comment">// restore state</font>
00135                          popad
00136                          mov result, 0
00137                         CPUIDPresent:    
00138                  }
00139                  <font class="keywordflow">return</font> result == 1;
00140 <font class="preprocessor">        #else</font>
00141 <font class="preprocessor"></font>                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00142 <font class="preprocessor">        #endif</font>
00143 <font class="preprocessor"></font>}
<a name="l00144"></a><a class="code" href="structNLMISC_1_1CCpuInfo______.html#d1">00144</a> <font class="keywordtype">bool</font> CCpuInfo___::hasMMX(<font class="keywordtype">void</font>) { <font class="keywordflow">return</font> <a class="code" href="namespaceNLMISC.html#a188">HasMMX</a>; }
<a name="l00145"></a><a class="code" href="structNLMISC_1_1CCpuInfo______.html#d2">00145</a> <font class="keywordtype">bool</font> CCpuInfo___::hasSSE(<font class="keywordtype">void</font>) { <font class="keywordflow">return</font> <a class="code" href="namespaceNLMISC.html#a189">HasSSE</a>; }
00146 
00147 } <font class="comment">// NLMISC</font>
</pre></div>

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