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doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/cgi-bin/nel-search.cgi">Search</a> </center> +<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 -> 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> + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |