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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 -> 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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