Imported tier1 and mathlib code from L4D2 SDK.

tier1/processor_detect_linux.cpp

@@ -0,0 +1,47 @@
+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: linux dependant ASM code for CPU capability detection
+//
+// $Workfile:     $
+// $NoKeywords: $
+//=============================================================================//
+
+#define cpuid(in,a,b,c,d)												\
+	asm("pushl %%ebx\n\t" "cpuid\n\t" "movl %%ebx,%%esi\n\t" "pop %%ebx": "=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (in));
+
+bool CheckMMXTechnology(void)
+{
+    unsigned long eax,ebx,edx,unused;
+    cpuid(1,eax,ebx,unused,edx);
+
+    return edx & 0x800000;
+}
+
+bool CheckSSETechnology(void)
+{
+    unsigned long eax,ebx,edx,unused;
+    cpuid(1,eax,ebx,unused,edx);
+
+    return edx & 0x2000000L;
+}
+
+bool CheckSSE2Technology(void)
+{
+    unsigned long eax,ebx,edx,unused;
+    cpuid(1,eax,ebx,unused,edx);
+
+    return edx & 0x04000000;
+}
+
+bool Check3DNowTechnology(void)
+{
+    unsigned long eax, unused;
+    cpuid(0x80000000,eax,unused,unused,unused);
+
+    if ( eax > 0x80000000L )
+    {
+     	cpuid(0x80000001,unused,unused,unused,eax);
+		return ( eax & 1<<31 );
+    }
+    return false;
+}