// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include <cstring>
#include <string>
#include "Common/CommonTypes.h"
#include "Common/CPUDetect.h"
#include "Common/Intrinsics.h"
#ifndef _WIN32
#if defined __FreeBSD__
#include <sys/types.h>
#include <machine/cpufunc.h>
#else
static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
#if defined _LP64
// Note: EBX is reserved on Mac OS X and in PIC on Linux, so it has to
// restored at the end of the asm block.
__asm__ (
"cpuid;"
"movl %%ebx,%1;"
: "=a" (*eax),
"=S" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "a" (*eax)
: "rbx"
);
#else
__asm__ (
"cpuid;"
"movl %%ebx,%1;"
: "=a" (*eax),
"=S" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "a" (*eax)
: "ebx"
);
#endif
}
#endif /* defined __FreeBSD__ */
static void __cpuid(int info[4], int x)
{
#if defined __FreeBSD__
do_cpuid((unsigned int)x, (unsigned int*)info);
#else
unsigned int eax = x, ebx = 0, ecx = 0, edx = 0;
do_cpuid(&eax, &ebx, &ecx, &edx);
info[0] = eax;
info[1] = ebx;
info[2] = ecx;
info[3] = edx;
#endif
}
#define _XCR_XFEATURE_ENABLED_MASK 0
static unsigned long long _xgetbv(unsigned int index)
{
unsigned int eax, edx;
__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
return ((unsigned long long)edx << 32) | eax;
}
#endif
CPUInfo cpu_info;
CPUInfo::CPUInfo()
{
Detect();
}
// Detects the various CPU features
void CPUInfo::Detect()
{
memset(this, 0, sizeof(*this));
#ifdef _M_X86_64
Mode64bit = true;
OS64bit = true;
#endif
num_cores = 1;
// Set obvious defaults, for extra safety
if (Mode64bit)
{
bSSE = true;
bSSE2 = true;
bLongMode = true;
}
// Assume CPU supports the CPUID instruction. Those that don't can barely
// boot modern OS:es anyway.
int cpu_id[4];
memset(brand_string, 0, sizeof(brand_string));
// Detect CPU's CPUID capabilities, and grab CPU string
__cpuid(cpu_id, 0x00000000);
u32 max_std_fn = cpu_id[0]; // EAX
*((int *)brand_string) = cpu_id[1];
*((int *)(brand_string + 4)) = cpu_id[3];
*((int *)(brand_string + 8)) = cpu_id[2];
__cpuid(cpu_id, 0x80000000);
u32 max_ex_fn = cpu_id[0];
if (!strcmp(brand_string, "GenuineIntel"))
vendor = VENDOR_INTEL;
else if (!strcmp(brand_string, "AuthenticAMD"))
vendor = VENDOR_AMD;
else
vendor = VENDOR_OTHER;
// Set reasonable default brand string even if brand string not available.
strcpy(cpu_string, brand_string);
// Detect family and other misc stuff.
bool ht = false;
HTT = ht;
logical_cpu_count = 1;
if (max_std_fn >= 1)
{
__cpuid(cpu_id, 0x00000001);
int family = ((cpu_id[0] >> 8) & 0xf) + ((cpu_id[0] >> 20) & 0xff);
int model = ((cpu_id[0] >> 4) & 0xf) + ((cpu_id[0] >> 12) & 0xf0);
// Detect people unfortunate enough to be running Dolphin on an Atom
if (family == 6 && (model == 0x1C || model == 0x26 ||model == 0x27 || model == 0x35 || model == 0x36 ||
model == 0x37 || model == 0x4A || model == 0x4D || model == 0x5A || model == 0x5D))
bAtom = true;
logical_cpu_count = (cpu_id[1] >> 16) & 0xFF;
ht = (cpu_id[3] >> 28) & 1;
if ((cpu_id[3] >> 25) & 1) bSSE = true;
if ((cpu_id[3] >> 26) & 1) bSSE2 = true;
if ((cpu_id[2]) & 1) bSSE3 = true;
if ((cpu_id[2] >> 9) & 1) bSSSE3 = true;
if ((cpu_id[2] >> 19) & 1) bSSE4_1 = true;
if ((cpu_id[2] >> 20) & 1) bSSE4_2 = true;
if ((cpu_id[2] >> 22) & 1) bMOVBE = true;
if ((cpu_id[2] >> 25) & 1) bAES = true;
if ((cpu_id[3] >> 24) & 1)
{
// We can use FXSAVE.
bFXSR = true;
}
// AVX support requires 3 separate checks:
// - Is the AVX bit set in CPUID?
// - Is the XSAVE bit set in CPUID?
// - XGETBV result has the XCR bit set.
if (((cpu_id[2] >> 28) & 1) && ((cpu_id[2] >> 27) & 1))
{
if ((_xgetbv(_XCR_XFEATURE_ENABLED_MASK) & 0x6) == 0x6)
{
bAVX = true;
if ((cpu_id[2] >> 12) & 1)
bFMA = true;
}
}
if (max_std_fn >= 7)
{
__cpuid(cpu_id, 0x00000007);
// careful; we can't enable AVX2 unless the XSAVE/XGETBV checks above passed
if ((cpu_id[1] >> 5) & 1)
bAVX2 = bAVX;
if ((cpu_id[1] >> 3) & 1)
bBMI1 = true;
if ((cpu_id[1] >> 8) & 1)
bBMI2 = true;
}
}
bFlushToZero = bSSE;
if (max_ex_fn >= 0x80000004)
{
// Extract CPU model string
__cpuid(cpu_id, 0x80000002);
memcpy(cpu_string, cpu_id, sizeof(cpu_id));
__cpuid(cpu_id, 0x80000003);
memcpy(cpu_string + 16, cpu_id, sizeof(cpu_id));
__cpuid(cpu_id, 0x80000004);
memcpy(cpu_string + 32, cpu_id, sizeof(cpu_id));
}
if (max_ex_fn >= 0x80000001)
{
// Check for more features.
__cpuid(cpu_id, 0x80000001);
if (cpu_id[2] & 1) bLAHFSAHF64 = true;
if ((cpu_id[2] >> 5) & 1) bLZCNT = true;
if ((cpu_id[3] >> 29) & 1) bLongMode = true;
}
num_cores = (logical_cpu_count == 0) ? 1 : logical_cpu_count;
if (max_ex_fn >= 0x80000008)
{
// Get number of cores. This is a bit complicated. Following AMD manual here.
__cpuid(cpu_id, 0x80000008);
int apic_id_core_id_size = (cpu_id[2] >> 12) & 0xF;
if (apic_id_core_id_size == 0)
{
if (ht)
{
// New mechanism for modern Intel CPUs.
if (vendor == VENDOR_INTEL)
{
__cpuid(cpu_id, 0x00000004);
int cores_x_package = ((cpu_id[0] >> 26) & 0x3F) + 1;
HTT = (cores_x_package < logical_cpu_count);
cores_x_package = ((logical_cpu_count % cores_x_package) == 0) ? cores_x_package : 1;
num_cores = (cores_x_package > 1) ? cores_x_package : num_cores;
logical_cpu_count /= cores_x_package;
}
}
} else
{
// Use AMD's new method.
num_cores = (cpu_id[2] & 0xFF) + 1;
}
}
}
// Turn the CPU info into a string we can show
std::string CPUInfo::Summarize()
{
std::string sum(cpu_string);
sum += " (";
sum += brand_string;
sum += ")";
if (bSSE) sum += ", SSE";
if (bSSE2)
{
sum += ", SSE2";
if (!bFlushToZero)
sum += " (but not DAZ!)";
}
if (bSSE3) sum += ", SSE3";
if (bSSSE3) sum += ", SSSE3";
if (bSSE4_1) sum += ", SSE4.1";
if (bSSE4_2) sum += ", SSE4.2";
if (HTT) sum += ", HTT";
if (bAVX) sum += ", AVX";
if (bAVX2) sum += ", AVX2";
if (bBMI1) sum += ", BMI1";
if (bBMI2) sum += ", BMI2";
if (bFMA) sum += ", FMA";
if (bAES) sum += ", AES";
if (bMOVBE) sum += ", MOVBE";
if (bLongMode) sum += ", 64-bit support";
return sum;
}