dolphin/Source/Core/Common/ArmCPUDetect.cpp

283 lines
5.7 KiB
C++

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <fstream>
#include <sstream>
#include <string>
#include "Common/CommonTypes.h"
#include "Common/CPUDetect.h"
#include "Common/StringUtil.h"
// Only Linux platforms have /proc/cpuinfo
#if !defined(BLACKBERRY) && !defined(IOS) && !defined(__SYMBIAN32__)
const char procfile[] = "/proc/cpuinfo";
static std::string GetCPUString()
{
const std::string marker = "Hardware\t: ";
std::string cpu_string = "Unknown";
std::string line;
std::ifstream file(procfile);
if (!file)
return cpu_string;
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
cpu_string = line.substr(marker.length());
break;
}
}
return cpu_string;
}
static unsigned char GetCPUImplementer()
{
const std::string marker = "CPU implementer\t: ";
unsigned char implementer = 0;
std::string line;
std::ifstream file(procfile);
if (!file)
return 0;
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
line = line.substr(marker.length());
sscanf(line.c_str(), "0x%02hhx", &implementer);
break;
}
}
return implementer;
}
static unsigned short GetCPUPart()
{
const std::string marker = "CPU part\t: ";
unsigned short part = 0;
std::string line;
std::ifstream file(procfile);
if (!file)
return 0;
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
line = line.substr(marker.length());
sscanf(line.c_str(), "0x%03hx", &part);
break;
}
}
return part;
}
static bool CheckCPUFeature(const std::string& feature)
{
const std::string marker = "Features\t: ";
std::string line;
std::ifstream file(procfile);
if (!file)
return 0;
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
std::stringstream line_stream(line);
std::string token;
while (std::getline(line_stream, token, ' '))
{
if (token == feature)
return true;
}
}
}
return false;
}
#endif
static int GetCoreCount()
{
#ifdef __SYMBIAN32__
return 1;
#elif defined(BLACKBERRY) || defined(IOS)
return 2;
#else
const std::string marker = "processor\t: ";
int cores = 0;
std::string line;
std::ifstream file(procfile);
if (!file)
return 0;
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
++cores;
}
}
return cores;
#endif
}
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;
#ifdef _M_ARM_64
OS64bit = true;
CPU64bit = true;
Mode64bit = true;
#else
OS64bit = false;
CPU64bit = false;
Mode64bit = false;
#endif
vendor = VENDOR_ARM;
// Get the information about the CPU
num_cores = GetCoreCount();
#if defined(__SYMBIAN32__) || defined(BLACKBERRY) || defined(IOS)
bool isVFP3 = false;
bool isVFP4 = false;
#ifdef IOS
isVFP3 = true;
// Check for swift arch (VFP4`)
#ifdef __ARM_ARCH_7S__
isVFP4 = true;
#endif // #ifdef __ARM_ARCH_7S__
#elif defined(BLACKBERRY)
isVFP3 = true;
const char cpuInfoPath[] = "/pps/services/hw_info/inventory";
const std::string marker = "Processor_Name::";
const std::string qcCPU = "MSM";
std::string line;
std::ifstream file(cpuInfoPath);
if (file)
{
while (std::getline(file, line))
{
if (line.find(marker) != std::string::npos)
{
std::string first_three_chars = line.substr(marker.length(), qcCPU.length());
if (first_three_chars == qcCPU)
{
isVFP4 = true;
}
break;
}
}
}
#endif
// Hardcode this for now
bSwp = true;
bHalf = true;
bThumb = false;
bFastMult = true;
bVFP = true;
bEDSP = true;
bThumbEE = isVFP3;
bNEON = isVFP3;
bVFPv3 = isVFP3;
bTLS = true;
bVFPv4 = isVFP4;
bIDIVa = isVFP4;
bIDIVt = isVFP4;
bFP = false;
bASIMD = false;
#else
strncpy(cpu_string, GetCPUString().c_str(), sizeof(cpu_string));
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");
// Qualcomm Krait supports IDIVA but it doesn't report it. Check for krait.
if (GetCPUImplementer() == 0x51 && GetCPUPart() == 0x6F) // Krait(300) is 0x6F, Scorpion is 0x4D
bIDIVa = bIDIVt = true;
// These two require ARMv8 or higher
bFP = CheckCPUFeature("fp");
bASIMD = CheckCPUFeature("asimd");
#endif
// On android, we build a separate library for ARMv7 so this is fine.
// TODO: Check for ARMv7 on other platforms.
#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 defined(BLACKBERRY) || defined(IOS) || defined(__SYMBIAN32__)
sum = StringFromFormat("%i cores", num_cores);
#else
if (num_cores == 1)
sum = StringFromFormat("%s, %i core", cpu_string, num_cores);
else
sum = StringFromFormat("%s, %i cores", cpu_string, num_cores);
#endif
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";
if (CPU64bit) sum += ", 64-bit";
return sum;
}