ARM Support without GLSL

Source/Core/Common/Src/ArmCPUDetect.cpp

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+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#include "Common.h"
+#include "CPUDetect.h"
+#include "StringUtil.h"
+
+const char procfile[] = "/proc/cpuinfo";
+
+char *GetCPUString()
+{
+	const char marker[] = "Hardware\t: ";
+	char *cpu_string = 0;
+	// Count the number of processor lines in /proc/cpuinfo
+	char buf[1024];
+	FILE *fp;
+
+	fp = fopen(procfile, "r");
+	if (!fp)
+		return 0;
+	
+	while (fgets(buf, sizeof(buf), fp))
+	{
+		if (strncmp(buf, marker, sizeof(marker) - 1))
+			continue;
+		cpu_string = buf + sizeof(marker) - 1;
+		cpu_string = strndup(cpu_string, strlen(cpu_string) - 1); // Strip the newline
+		break;
+	}
+	return cpu_string;
+}
+bool CheckCPUFeature(const char *feature)
+{
+	const char marker[] = "Features\t: ";
+	char buf[1024];
+	FILE *fp;
+
+	fp = fopen(procfile, "r");
+	if (!fp)
+		return 0;
+	
+	while (fgets(buf, sizeof(buf), fp))
+	{
+		if (strncmp(buf, marker, sizeof(marker) - 1))
+			continue;
+		char *featurestring = buf + sizeof(marker) - 1;
+		char *token = strtok(featurestring, " ");
+		while (token != NULL)
+		{
+			if (strstr(token, feature))
+				return true; 
+			token = strtok(NULL, " ");
+		}
+	}
+	return false;
+}
+int GetCoreCount()
+{
+	const char marker[] = "processor\t: ";
+	int cores = 0;
+	char buf[1024];
+	FILE *fp;
+
+	fp = fopen(procfile, "r");
+	if (!fp)
+		return 0;
+	
+	while (fgets(buf, sizeof(buf), fp))
+	{
+		if (strncmp(buf, marker, sizeof(marker) - 1))
+			continue;
+		++cores;
+	}
+	return cores;
+}
+
+CPUInfo cpu_info;
+
+CPUInfo::CPUInfo() {
+	Detect();
+}
+
+// Detects the various cpu features
+void CPUInfo::Detect()
+{
+	// Set some defaults here
+	// When ARMv8 cpus come out, these need to be updated.
+	HTT = false;
+	OS64bit = false;
+	CPU64bit = false;
+	Mode64bit = false;				 
+	vendor = VENDOR_ARM;
+	
+	// Get the information about the CPU 
+	strncpy(cpu_string, GetCPUString(), sizeof(cpu_string));
+	num_cores = GetCoreCount();	
+	bSwp = CheckCPUFeature("swp");
+	bHalf = CheckCPUFeature("half");
+	bThumb = CheckCPUFeature("thumb");
+	bFastMult = CheckCPUFeature("fastmult");
+	bVFP = CheckCPUFeature("vfp");
+	bEDSP = CheckCPUFeature("edsp");
+	bThumbEE = CheckCPUFeature("thumbee");
+	bNEON = CheckCPUFeature("neon");
+	bVFPv3 = CheckCPUFeature("vfpv3");
+	bTLS = CheckCPUFeature("tls");
+	bVFPv4 = CheckCPUFeature("vfpv4");
+	bIDIVa = CheckCPUFeature("idiva");
+	bIDIVt = CheckCPUFeature("idivt");
+	// These two are ARMv8 specific.
+	bFP = CheckCPUFeature("fp");
+	bASIMD = CheckCPUFeature("asimd");
+
+
+#if defined(__ARM_ARCH_7A__)
+	bArmV7 = true;
+#else
+	bArmV7 = false;
+#endif
+}
+
+// Turn the cpu info into a string we can show
+std::string CPUInfo::Summarize()
+{
+	std::string sum;
+	if (num_cores == 1)
+		sum = StringFromFormat("%s, %i core", cpu_string, num_cores);
+	else
+		sum = StringFromFormat("%s, %i cores", cpu_string, num_cores);
+
+	if (bSwp) sum += ", SWP";
+	if (bHalf) sum += ", Half";
+	if (bThumb) sum += ", Thumb";
+	if (bFastMult) sum += ", FastMult";
+	if (bVFP) sum += ", VFP";
+	if (bEDSP) sum += ", EDSP";
+	if (bThumbEE) sum += ", ThumbEE";
+	if (bNEON) sum += ", NEON";
+	if (bVFPv3) sum += ", VFPv3";
+	if (bTLS) sum += ", TLS";
+	if (bVFPv4) sum += ", VFPv4";
+	if (bIDIVa) sum += ", IDIVa";
+	if (bIDIVt) sum += ", IDIVt";
+
+	return sum;
+}