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// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstring>
#include <string>
#include "common/common_types.h"
#include "cpu_detect.h"
#ifndef _WIN32
#ifdef __FreeBSD__
#include <sys/types.h>
#include <machine/cpufunc.h>
#endif
static inline void __cpuidex(int info[4], int function_id, int subfunction_id)
{
#ifdef __FreeBSD__
// Despite the name, this is just do_cpuid() with ECX as second input.
cpuid_count((u_int)function_id, (u_int)subfunction_id, (u_int*)info);
#else
info[0] = function_id; // eax
info[2] = subfunction_id; // ecx
__asm__(
"cpuid"
: "=a" (info[0]),
"=b" (info[1]),
"=c" (info[2]),
"=d" (info[3])
: "a" (function_id),
"c" (subfunction_id)
);
#endif
}
static inline void __cpuid(int info[4], int function_id)
{
return __cpuidex(info, function_id, 0);
}
#define _XCR_XFEATURE_ENABLED_MASK 0
static u64 _xgetbv(u32 index)
{
u32 eax, edx;
__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
return ((u64)edx << 32) | eax;
}
#endif // ifndef _WIN32
namespace Common {
CPUInfo cpu_info;
CPUInfo::CPUInfo() {
Detect();
}
// Detects the various CPU features
void CPUInfo::Detect() {
memset(this, 0, sizeof(*this));
#ifdef ARCHITECTURE_X64
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) {
__cpuidex(cpu_id, 0x00000007, 0x00000000);
// 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[2] >> 16) & 1) bFMA4 = 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) {
__cpuidex(cpu_id, 0x00000004, 0x00000000);
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;
}
} // namespace Common
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