From f81d32918f253847e9fa1e1a37c824ff6128815d Mon Sep 17 00:00:00 2001
From: dhewg <dhewg@wiibrew.org>
Date: Tue, 13 Dec 2011 18:56:17 +0100
Subject: [PATCH] Implement Sys_GetProcessorId for x86 and x86_64

Detect CPU features at runtime via cpuid - code borrowed from
libavutil.
Availability of cpuid is not checked since pentium3 supports it
and that was the minimum requirement anyway.
Only features enabled at compile time will be available.

Forced MMX/SSE/SSE2/SSE3 and it passed all tests via:
./doom3.x86_64 +disconnect +set s_noSound 1 +testSIMD
---
 neo/sys/linux/main.cpp | 94 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 93 insertions(+), 1 deletion(-)

diff --git a/neo/sys/linux/main.cpp b/neo/sys/linux/main.cpp
index d8d84627..1cb4a2c5 100644
--- a/neo/sys/linux/main.cpp
+++ b/neo/sys/linux/main.cpp
@@ -208,9 +208,101 @@ void Sys_Shutdown( void ) {
 Sys_GetProcessorId
 ===============
 */
+static char cpustring[13] = "generic\0";
+
+#if defined(__x86_64__) || defined(__i386__)
+#if __x86_64__
+#	define REG_b "rbx"
+#	define REG_S "rsi"
+#elif __i386__
+#	define REG_b "ebx"
+#	define REG_S "esi"
+#endif
+
+#define cpuid(index,eax,ebx,ecx,edx)		\
+	__asm__ volatile						\
+	(	"mov %%" REG_b ", %%" REG_S "\n\t"	\
+		"cpuid\n\t"							\
+		"xchg %%" REG_b ", %%" REG_S		\
+		:	"=a" (eax), "=S" (ebx),			\
+			"=c" (ecx), "=d" (edx)			\
+		: "0" (index));
+
+int Sys_GetProcessorId( void ) {
+	int eax, ebx, ecx, edx;
+	int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
+	union { int i[3]; char c[12]; } vendor;
+
+	int i = CPUID_GENERIC;
+
+	cpuid(0, max_std_level, ebx, ecx, edx);
+	vendor.i[0] = ebx;
+	vendor.i[1] = edx;
+	vendor.i[2] = ecx;
+
+	strncpy(cpustring, vendor.c, 12);
+	cpustring[12] = 0;
+
+	Sys_Printf("Detected '%s' CPU with", cpustring);
+
+	if (max_std_level >= 1) {
+		cpuid(1, eax, ebx, ecx, std_caps);
+
+#ifdef __MMX__
+		if (std_caps & (1<<23)) {
+			Sys_Printf(" MMX");
+			i |= CPUID_MMX;
+		}
+#endif
+#ifdef __SSE__
+		if (std_caps & (1<<25)) {
+			Sys_Printf(" SSE");
+			i |= CPUID_SSE;
+		}
+#endif
+#ifdef __SSE2__
+		if (std_caps & (1<<26)) {
+			Sys_Printf(" SSE2");
+			i |= CPUID_SSE2;
+		}
+#endif
+#ifdef __SSE3__
+		if (ecx & 1) {
+			Sys_Printf(" SSE3");
+			i |= CPUID_SSE3;
+		}
+#endif
+	}
+
+	cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
+
+	if (max_ext_level >= 0x80000001) {
+		cpuid(0x80000001, eax, ebx, ecx, ext_caps);
+
+#ifdef __3dNOW__
+		if (ext_caps & (1U<<31)) {
+			Sys_Printf(" 3DNOW");
+			i |= CPUID_3DNOW;
+		}
+#endif
+#ifdef __MMX__
+		if (ext_caps & (1<<23)) {
+			if (!(i & CPUID_MMX))
+				Sys_Printf(" MMX");
+			i |= CPUID_MMX;
+		}
+#endif
+	}
+
+	Sys_Printf("\n");
+
+	return i;
+}
+#else
 int Sys_GetProcessorId( void ) {
 	return CPUID_GENERIC;
 }
+#endif
 
 /*
 ===============
@@ -218,7 +310,7 @@ Sys_GetProcessorString
 ===============
 */
 const char *Sys_GetProcessorString( void ) {
-	return "generic";
+	return cpustring;
 }
 
 /*