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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
committerneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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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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