diff options
Diffstat (limited to 'vendor/github.com/klauspost/cpuid/cpuid.go')
| -rw-r--r-- | vendor/github.com/klauspost/cpuid/cpuid.go | 1040 |
1 files changed, 1040 insertions, 0 deletions
diff --git a/vendor/github.com/klauspost/cpuid/cpuid.go b/vendor/github.com/klauspost/cpuid/cpuid.go new file mode 100644 index 000000000..60c681bed --- /dev/null +++ b/vendor/github.com/klauspost/cpuid/cpuid.go @@ -0,0 +1,1040 @@ +// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file. + +// Package cpuid provides information about the CPU running the current program. +// +// CPU features are detected on startup, and kept for fast access through the life of the application. +// Currently x86 / x64 (AMD64) is supported. +// +// You can access the CPU information by accessing the shared CPU variable of the cpuid library. +// +// Package home: https://github.com/klauspost/cpuid +package cpuid + +import "strings" + +// Vendor is a representation of a CPU vendor. +type Vendor int + +const ( + Other Vendor = iota + Intel + AMD + VIA + Transmeta + NSC + KVM // Kernel-based Virtual Machine + MSVM // Microsoft Hyper-V or Windows Virtual PC + VMware + XenHVM +) + +const ( + CMOV = 1 << iota // i686 CMOV + NX // NX (No-Execute) bit + AMD3DNOW // AMD 3DNOW + AMD3DNOWEXT // AMD 3DNowExt + MMX // standard MMX + MMXEXT // SSE integer functions or AMD MMX ext + SSE // SSE functions + SSE2 // P4 SSE functions + SSE3 // Prescott SSE3 functions + SSSE3 // Conroe SSSE3 functions + SSE4 // Penryn SSE4.1 functions + SSE4A // AMD Barcelona microarchitecture SSE4a instructions + SSE42 // Nehalem SSE4.2 functions + AVX // AVX functions + AVX2 // AVX2 functions + FMA3 // Intel FMA 3 + FMA4 // Bulldozer FMA4 functions + XOP // Bulldozer XOP functions + F16C // Half-precision floating-point conversion + BMI1 // Bit Manipulation Instruction Set 1 + BMI2 // Bit Manipulation Instruction Set 2 + TBM // AMD Trailing Bit Manipulation + LZCNT // LZCNT instruction + POPCNT // POPCNT instruction + AESNI // Advanced Encryption Standard New Instructions + CLMUL // Carry-less Multiplication + HTT // Hyperthreading (enabled) + HLE // Hardware Lock Elision + RTM // Restricted Transactional Memory + RDRAND // RDRAND instruction is available + RDSEED // RDSEED instruction is available + ADX // Intel ADX (Multi-Precision Add-Carry Instruction Extensions) + SHA // Intel SHA Extensions + AVX512F // AVX-512 Foundation + AVX512DQ // AVX-512 Doubleword and Quadword Instructions + AVX512IFMA // AVX-512 Integer Fused Multiply-Add Instructions + AVX512PF // AVX-512 Prefetch Instructions + AVX512ER // AVX-512 Exponential and Reciprocal Instructions + AVX512CD // AVX-512 Conflict Detection Instructions + AVX512BW // AVX-512 Byte and Word Instructions + AVX512VL // AVX-512 Vector Length Extensions + AVX512VBMI // AVX-512 Vector Bit Manipulation Instructions + MPX // Intel MPX (Memory Protection Extensions) + ERMS // Enhanced REP MOVSB/STOSB + RDTSCP // RDTSCP Instruction + CX16 // CMPXCHG16B Instruction + SGX // Software Guard Extensions + IBPB // Indirect Branch Restricted Speculation (IBRS) and Indirect Branch Predictor Barrier (IBPB) + STIBP // Single Thread Indirect Branch Predictors + + // Performance indicators + SSE2SLOW // SSE2 is supported, but usually not faster + SSE3SLOW // SSE3 is supported, but usually not faster + ATOM // Atom processor, some SSSE3 instructions are slower +) + +var flagNames = map[Flags]string{ + CMOV: "CMOV", // i686 CMOV + NX: "NX", // NX (No-Execute) bit + AMD3DNOW: "AMD3DNOW", // AMD 3DNOW + AMD3DNOWEXT: "AMD3DNOWEXT", // AMD 3DNowExt + MMX: "MMX", // Standard MMX + MMXEXT: "MMXEXT", // SSE integer functions or AMD MMX ext + SSE: "SSE", // SSE functions + SSE2: "SSE2", // P4 SSE2 functions + SSE3: "SSE3", // Prescott SSE3 functions + SSSE3: "SSSE3", // Conroe SSSE3 functions + SSE4: "SSE4.1", // Penryn SSE4.1 functions + SSE4A: "SSE4A", // AMD Barcelona microarchitecture SSE4a instructions + SSE42: "SSE4.2", // Nehalem SSE4.2 functions + AVX: "AVX", // AVX functions + AVX2: "AVX2", // AVX functions + FMA3: "FMA3", // Intel FMA 3 + FMA4: "FMA4", // Bulldozer FMA4 functions + XOP: "XOP", // Bulldozer XOP functions + F16C: "F16C", // Half-precision floating-point conversion + BMI1: "BMI1", // Bit Manipulation Instruction Set 1 + BMI2: "BMI2", // Bit Manipulation Instruction Set 2 + TBM: "TBM", // AMD Trailing Bit Manipulation + LZCNT: "LZCNT", // LZCNT instruction + POPCNT: "POPCNT", // POPCNT instruction + AESNI: "AESNI", // Advanced Encryption Standard New Instructions + CLMUL: "CLMUL", // Carry-less Multiplication + HTT: "HTT", // Hyperthreading (enabled) + HLE: "HLE", // Hardware Lock Elision + RTM: "RTM", // Restricted Transactional Memory + RDRAND: "RDRAND", // RDRAND instruction is available + RDSEED: "RDSEED", // RDSEED instruction is available + ADX: "ADX", // Intel ADX (Multi-Precision Add-Carry Instruction Extensions) + SHA: "SHA", // Intel SHA Extensions + AVX512F: "AVX512F", // AVX-512 Foundation + AVX512DQ: "AVX512DQ", // AVX-512 Doubleword and Quadword Instructions + AVX512IFMA: "AVX512IFMA", // AVX-512 Integer Fused Multiply-Add Instructions + AVX512PF: "AVX512PF", // AVX-512 Prefetch Instructions + AVX512ER: "AVX512ER", // AVX-512 Exponential and Reciprocal Instructions + AVX512CD: "AVX512CD", // AVX-512 Conflict Detection Instructions + AVX512BW: "AVX512BW", // AVX-512 Byte and Word Instructions + AVX512VL: "AVX512VL", // AVX-512 Vector Length Extensions + AVX512VBMI: "AVX512VBMI", // AVX-512 Vector Bit Manipulation Instructions + MPX: "MPX", // Intel MPX (Memory Protection Extensions) + ERMS: "ERMS", // Enhanced REP MOVSB/STOSB + RDTSCP: "RDTSCP", // RDTSCP Instruction + CX16: "CX16", // CMPXCHG16B Instruction + SGX: "SGX", // Software Guard Extensions + IBPB: "IBPB", // Indirect Branch Restricted Speculation and Indirect Branch Predictor Barrier + STIBP: "STIBP", // Single Thread Indirect Branch Predictors + + // Performance indicators + SSE2SLOW: "SSE2SLOW", // SSE2 supported, but usually not faster + SSE3SLOW: "SSE3SLOW", // SSE3 supported, but usually not faster + ATOM: "ATOM", // Atom processor, some SSSE3 instructions are slower + +} + +// CPUInfo contains information about the detected system CPU. +type CPUInfo struct { + BrandName string // Brand name reported by the CPU + VendorID Vendor // Comparable CPU vendor ID + Features Flags // Features of the CPU + PhysicalCores int // Number of physical processor cores in your CPU. Will be 0 if undetectable. + ThreadsPerCore int // Number of threads per physical core. Will be 1 if undetectable. + LogicalCores int // Number of physical cores times threads that can run on each core through the use of hyperthreading. Will be 0 if undetectable. + Family int // CPU family number + Model int // CPU model number + CacheLine int // Cache line size in bytes. Will be 0 if undetectable. + Cache struct { + L1I int // L1 Instruction Cache (per core or shared). Will be -1 if undetected + L1D int // L1 Data Cache (per core or shared). Will be -1 if undetected + L2 int // L2 Cache (per core or shared). Will be -1 if undetected + L3 int // L3 Instruction Cache (per core or shared). Will be -1 if undetected + } + SGX SGXSupport + maxFunc uint32 + maxExFunc uint32 +} + +var cpuid func(op uint32) (eax, ebx, ecx, edx uint32) +var cpuidex func(op, op2 uint32) (eax, ebx, ecx, edx uint32) +var xgetbv func(index uint32) (eax, edx uint32) +var rdtscpAsm func() (eax, ebx, ecx, edx uint32) + +// CPU contains information about the CPU as detected on startup, +// or when Detect last was called. +// +// Use this as the primary entry point to you data, +// this way queries are +var CPU CPUInfo + +func init() { + initCPU() + Detect() +} + +// Detect will re-detect current CPU info. +// This will replace the content of the exported CPU variable. +// +// Unless you expect the CPU to change while you are running your program +// you should not need to call this function. +// If you call this, you must ensure that no other goroutine is accessing the +// exported CPU variable. +func Detect() { + CPU.maxFunc = maxFunctionID() + CPU.maxExFunc = maxExtendedFunction() + CPU.BrandName = brandName() + CPU.CacheLine = cacheLine() + CPU.Family, CPU.Model = familyModel() + CPU.Features = support() + CPU.SGX = hasSGX(CPU.Features&SGX != 0) + CPU.ThreadsPerCore = threadsPerCore() + CPU.LogicalCores = logicalCores() + CPU.PhysicalCores = physicalCores() + CPU.VendorID = vendorID() + CPU.cacheSize() +} + +// Generated here: http://play.golang.org/p/BxFH2Gdc0G + +// Cmov indicates support of CMOV instructions +func (c CPUInfo) Cmov() bool { + return c.Features&CMOV != 0 +} + +// Amd3dnow indicates support of AMD 3DNOW! instructions +func (c CPUInfo) Amd3dnow() bool { + return c.Features&AMD3DNOW != 0 +} + +// Amd3dnowExt indicates support of AMD 3DNOW! Extended instructions +func (c CPUInfo) Amd3dnowExt() bool { + return c.Features&AMD3DNOWEXT != 0 +} + +// MMX indicates support of MMX instructions +func (c CPUInfo) MMX() bool { + return c.Features&MMX != 0 +} + +// MMXExt indicates support of MMXEXT instructions +// (SSE integer functions or AMD MMX ext) +func (c CPUInfo) MMXExt() bool { + return c.Features&MMXEXT != 0 +} + +// SSE indicates support of SSE instructions +func (c CPUInfo) SSE() bool { + return c.Features&SSE != 0 +} + +// SSE2 indicates support of SSE 2 instructions +func (c CPUInfo) SSE2() bool { + return c.Features&SSE2 != 0 +} + +// SSE3 indicates support of SSE 3 instructions +func (c CPUInfo) SSE3() bool { + return c.Features&SSE3 != 0 +} + +// SSSE3 indicates support of SSSE 3 instructions +func (c CPUInfo) SSSE3() bool { + return c.Features&SSSE3 != 0 +} + +// SSE4 indicates support of SSE 4 (also called SSE 4.1) instructions +func (c CPUInfo) SSE4() bool { + return c.Features&SSE4 != 0 +} + +// SSE42 indicates support of SSE4.2 instructions +func (c CPUInfo) SSE42() bool { + return c.Features&SSE42 != 0 +} + +// AVX indicates support of AVX instructions +// and operating system support of AVX instructions +func (c CPUInfo) AVX() bool { + return c.Features&AVX != 0 +} + +// AVX2 indicates support of AVX2 instructions +func (c CPUInfo) AVX2() bool { + return c.Features&AVX2 != 0 +} + +// FMA3 indicates support of FMA3 instructions +func (c CPUInfo) FMA3() bool { + return c.Features&FMA3 != 0 +} + +// FMA4 indicates support of FMA4 instructions +func (c CPUInfo) FMA4() bool { + return c.Features&FMA4 != 0 +} + +// XOP indicates support of XOP instructions +func (c CPUInfo) XOP() bool { + return c.Features&XOP != 0 +} + +// F16C indicates support of F16C instructions +func (c CPUInfo) F16C() bool { + return c.Features&F16C != 0 +} + +// BMI1 indicates support of BMI1 instructions +func (c CPUInfo) BMI1() bool { + return c.Features&BMI1 != 0 +} + +// BMI2 indicates support of BMI2 instructions +func (c CPUInfo) BMI2() bool { + return c.Features&BMI2 != 0 +} + +// TBM indicates support of TBM instructions +// (AMD Trailing Bit Manipulation) +func (c CPUInfo) TBM() bool { + return c.Features&TBM != 0 +} + +// Lzcnt indicates support of LZCNT instruction +func (c CPUInfo) Lzcnt() bool { + return c.Features&LZCNT != 0 +} + +// Popcnt indicates support of POPCNT instruction +func (c CPUInfo) Popcnt() bool { + return c.Features&POPCNT != 0 +} + +// HTT indicates the processor has Hyperthreading enabled +func (c CPUInfo) HTT() bool { + return c.Features&HTT != 0 +} + +// SSE2Slow indicates that SSE2 may be slow on this processor +func (c CPUInfo) SSE2Slow() bool { + return c.Features&SSE2SLOW != 0 +} + +// SSE3Slow indicates that SSE3 may be slow on this processor +func (c CPUInfo) SSE3Slow() bool { + return c.Features&SSE3SLOW != 0 +} + +// AesNi indicates support of AES-NI instructions +// (Advanced Encryption Standard New Instructions) +func (c CPUInfo) AesNi() bool { + return c.Features&AESNI != 0 +} + +// Clmul indicates support of CLMUL instructions +// (Carry-less Multiplication) +func (c CPUInfo) Clmul() bool { + return c.Features&CLMUL != 0 +} + +// NX indicates support of NX (No-Execute) bit +func (c CPUInfo) NX() bool { + return c.Features&NX != 0 +} + +// SSE4A indicates support of AMD Barcelona microarchitecture SSE4a instructions +func (c CPUInfo) SSE4A() bool { + return c.Features&SSE4A != 0 +} + +// HLE indicates support of Hardware Lock Elision +func (c CPUInfo) HLE() bool { + return c.Features&HLE != 0 +} + +// RTM indicates support of Restricted Transactional Memory +func (c CPUInfo) RTM() bool { + return c.Features&RTM != 0 +} + +// Rdrand indicates support of RDRAND instruction is available +func (c CPUInfo) Rdrand() bool { + return c.Features&RDRAND != 0 +} + +// Rdseed indicates support of RDSEED instruction is available +func (c CPUInfo) Rdseed() bool { + return c.Features&RDSEED != 0 +} + +// ADX indicates support of Intel ADX (Multi-Precision Add-Carry Instruction Extensions) +func (c CPUInfo) ADX() bool { + return c.Features&ADX != 0 +} + +// SHA indicates support of Intel SHA Extensions +func (c CPUInfo) SHA() bool { + return c.Features&SHA != 0 +} + +// AVX512F indicates support of AVX-512 Foundation +func (c CPUInfo) AVX512F() bool { + return c.Features&AVX512F != 0 +} + +// AVX512DQ indicates support of AVX-512 Doubleword and Quadword Instructions +func (c CPUInfo) AVX512DQ() bool { + return c.Features&AVX512DQ != 0 +} + +// AVX512IFMA indicates support of AVX-512 Integer Fused Multiply-Add Instructions +func (c CPUInfo) AVX512IFMA() bool { + return c.Features&AVX512IFMA != 0 +} + +// AVX512PF indicates support of AVX-512 Prefetch Instructions +func (c CPUInfo) AVX512PF() bool { + return c.Features&AVX512PF != 0 +} + +// AVX512ER indicates support of AVX-512 Exponential and Reciprocal Instructions +func (c CPUInfo) AVX512ER() bool { + return c.Features&AVX512ER != 0 +} + +// AVX512CD indicates support of AVX-512 Conflict Detection Instructions +func (c CPUInfo) AVX512CD() bool { + return c.Features&AVX512CD != 0 +} + +// AVX512BW indicates support of AVX-512 Byte and Word Instructions +func (c CPUInfo) AVX512BW() bool { + return c.Features&AVX512BW != 0 +} + +// AVX512VL indicates support of AVX-512 Vector Length Extensions +func (c CPUInfo) AVX512VL() bool { + return c.Features&AVX512VL != 0 +} + +// AVX512VBMI indicates support of AVX-512 Vector Bit Manipulation Instructions +func (c CPUInfo) AVX512VBMI() bool { + return c.Features&AVX512VBMI != 0 +} + +// MPX indicates support of Intel MPX (Memory Protection Extensions) +func (c CPUInfo) MPX() bool { + return c.Features&MPX != 0 +} + +// ERMS indicates support of Enhanced REP MOVSB/STOSB +func (c CPUInfo) ERMS() bool { + return c.Features&ERMS != 0 +} + +// RDTSCP Instruction is available. +func (c CPUInfo) RDTSCP() bool { + return c.Features&RDTSCP != 0 +} + +// CX16 indicates if CMPXCHG16B instruction is available. +func (c CPUInfo) CX16() bool { + return c.Features&CX16 != 0 +} + +// TSX is split into HLE (Hardware Lock Elision) and RTM (Restricted Transactional Memory) detection. +// So TSX simply checks that. +func (c CPUInfo) TSX() bool { + return c.Features&(HLE|RTM) == HLE|RTM +} + +// Atom indicates an Atom processor +func (c CPUInfo) Atom() bool { + return c.Features&ATOM != 0 +} + +// Intel returns true if vendor is recognized as Intel +func (c CPUInfo) Intel() bool { + return c.VendorID == Intel +} + +// AMD returns true if vendor is recognized as AMD +func (c CPUInfo) AMD() bool { + return c.VendorID == AMD +} + +// Transmeta returns true if vendor is recognized as Transmeta +func (c CPUInfo) Transmeta() bool { + return c.VendorID == Transmeta +} + +// NSC returns true if vendor is recognized as National Semiconductor +func (c CPUInfo) NSC() bool { + return c.VendorID == NSC +} + +// VIA returns true if vendor is recognized as VIA +func (c CPUInfo) VIA() bool { + return c.VendorID == VIA +} + +// RTCounter returns the 64-bit time-stamp counter +// Uses the RDTSCP instruction. The value 0 is returned +// if the CPU does not support the instruction. +func (c CPUInfo) RTCounter() uint64 { + if !c.RDTSCP() { + return 0 + } + a, _, _, d := rdtscpAsm() + return uint64(a) | (uint64(d) << 32) +} + +// Ia32TscAux returns the IA32_TSC_AUX part of the RDTSCP. +// This variable is OS dependent, but on Linux contains information +// about the current cpu/core the code is running on. +// If the RDTSCP instruction isn't supported on the CPU, the value 0 is returned. +func (c CPUInfo) Ia32TscAux() uint32 { + if !c.RDTSCP() { + return 0 + } + _, _, ecx, _ := rdtscpAsm() + return ecx +} + +// LogicalCPU will return the Logical CPU the code is currently executing on. +// This is likely to change when the OS re-schedules the running thread +// to another CPU. +// If the current core cannot be detected, -1 will be returned. +func (c CPUInfo) LogicalCPU() int { + if c.maxFunc < 1 { + return -1 + } + _, ebx, _, _ := cpuid(1) + return int(ebx >> 24) +} + +// VM Will return true if the cpu id indicates we are in +// a virtual machine. This is only a hint, and will very likely +// have many false negatives. +func (c CPUInfo) VM() bool { + switch c.VendorID { + case MSVM, KVM, VMware, XenHVM: + return true + } + return false +} + +// Flags contains detected cpu features and caracteristics +type Flags uint64 + +// String returns a string representation of the detected +// CPU features. +func (f Flags) String() string { + return strings.Join(f.Strings(), ",") +} + +// Strings returns and array of the detected features. +func (f Flags) Strings() []string { + s := support() + r := make([]string, 0, 20) + for i := uint(0); i < 64; i++ { + key := Flags(1 << i) + val := flagNames[key] + if s&key != 0 { + r = append(r, val) + } + } + return r +} + +func maxExtendedFunction() uint32 { + eax, _, _, _ := cpuid(0x80000000) + return eax +} + +func maxFunctionID() uint32 { + a, _, _, _ := cpuid(0) + return a +} + +func brandName() string { + if maxExtendedFunction() >= 0x80000004 { + v := make([]uint32, 0, 48) + for i := uint32(0); i < 3; i++ { + a, b, c, d := cpuid(0x80000002 + i) + v = append(v, a, b, c, d) + } + return strings.Trim(string(valAsString(v...)), " ") + } + return "unknown" +} + +func threadsPerCore() int { + mfi := maxFunctionID() + if mfi < 0x4 || vendorID() != Intel { + return 1 + } + + if mfi < 0xb { + _, b, _, d := cpuid(1) + if (d & (1 << 28)) != 0 { + // v will contain logical core count + v := (b >> 16) & 255 + if v > 1 { + a4, _, _, _ := cpuid(4) + // physical cores + v2 := (a4 >> 26) + 1 + if v2 > 0 { + return int(v) / int(v2) + } + } + } + return 1 + } + _, b, _, _ := cpuidex(0xb, 0) + if b&0xffff == 0 { + return 1 + } + return int(b & 0xffff) +} + +func logicalCores() int { + mfi := maxFunctionID() + switch vendorID() { + case Intel: + // Use this on old Intel processors + if mfi < 0xb { + if mfi < 1 { + return 0 + } + // CPUID.1:EBX[23:16] represents the maximum number of addressable IDs (initial APIC ID) + // that can be assigned to logical processors in a physical package. + // The value may not be the same as the number of logical processors that are present in the hardware of a physical package. + _, ebx, _, _ := cpuid(1) + logical := (ebx >> 16) & 0xff + return int(logical) + } + _, b, _, _ := cpuidex(0xb, 1) + return int(b & 0xffff) + case AMD: + _, b, _, _ := cpuid(1) + return int((b >> 16) & 0xff) + default: + return 0 + } +} + +func familyModel() (int, int) { + if maxFunctionID() < 0x1 { + return 0, 0 + } + eax, _, _, _ := cpuid(1) + family := ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff) + model := ((eax >> 4) & 0xf) + ((eax >> 12) & 0xf0) + return int(family), int(model) +} + +func physicalCores() int { + switch vendorID() { + case Intel: + return logicalCores() / threadsPerCore() + case AMD: + if maxExtendedFunction() >= 0x80000008 { + _, _, c, _ := cpuid(0x80000008) + return int(c&0xff) + 1 + } + } + return 0 +} + +// Except from http://en.wikipedia.org/wiki/CPUID#EAX.3D0:_Get_vendor_ID +var vendorMapping = map[string]Vendor{ + "AMDisbetter!": AMD, + "AuthenticAMD": AMD, + "CentaurHauls": VIA, + "GenuineIntel": Intel, + "TransmetaCPU": Transmeta, + "GenuineTMx86": Transmeta, + "Geode by NSC": NSC, + "VIA VIA VIA ": VIA, + "KVMKVMKVMKVM": KVM, + "Microsoft Hv": MSVM, + "VMwareVMware": VMware, + "XenVMMXenVMM": XenHVM, +} + +func vendorID() Vendor { + _, b, c, d := cpuid(0) + v := valAsString(b, d, c) + vend, ok := vendorMapping[string(v)] + if !ok { + return Other + } + return vend +} + +func cacheLine() int { + if maxFunctionID() < 0x1 { + return 0 + } + + _, ebx, _, _ := cpuid(1) + cache := (ebx & 0xff00) >> 5 // cflush size + if cache == 0 && maxExtendedFunction() >= 0x80000006 { + _, _, ecx, _ := cpuid(0x80000006) + cache = ecx & 0xff // cacheline size + } + // TODO: Read from Cache and TLB Information + return int(cache) +} + +func (c *CPUInfo) cacheSize() { + c.Cache.L1D = -1 + c.Cache.L1I = -1 + c.Cache.L2 = -1 + c.Cache.L3 = -1 + vendor := vendorID() + switch vendor { + case Intel: + if maxFunctionID() < 4 { + return + } + for i := uint32(0); ; i++ { + eax, ebx, ecx, _ := cpuidex(4, i) + cacheType := eax & 15 + if cacheType == 0 { + break + } + cacheLevel := (eax >> 5) & 7 + coherency := int(ebx&0xfff) + 1 + partitions := int((ebx>>12)&0x3ff) + 1 + associativity := int((ebx>>22)&0x3ff) + 1 + sets := int(ecx) + 1 + size := associativity * partitions * coherency * sets + switch cacheLevel { + case 1: + if cacheType == 1 { + // 1 = Data Cache + c.Cache.L1D = size + } else if cacheType == 2 { + // 2 = Instruction Cache + c.Cache.L1I = size + } else { + if c.Cache.L1D < 0 { + c.Cache.L1I = size + } + if c.Cache.L1I < 0 { + c.Cache.L1I = size + } + } + case 2: + c.Cache.L2 = size + case 3: + c.Cache.L3 = size + } + } + case AMD: + // Untested. + if maxExtendedFunction() < 0x80000005 { + return + } + _, _, ecx, edx := cpuid(0x80000005) + c.Cache.L1D = int(((ecx >> 24) & 0xFF) * 1024) + c.Cache.L1I = int(((edx >> 24) & 0xFF) * 1024) + + if maxExtendedFunction() < 0x80000006 { + return + } + _, _, ecx, _ = cpuid(0x80000006) + c.Cache.L2 = int(((ecx >> 16) & 0xFFFF) * 1024) + } + + return +} + +type SGXSupport struct { + Available bool + SGX1Supported bool + SGX2Supported bool + MaxEnclaveSizeNot64 int64 + MaxEnclaveSize64 int64 +} + +func hasSGX(available bool) (rval SGXSupport) { + rval.Available = available + + if !available { + return + } + + a, _, _, d := cpuidex(0x12, 0) + rval.SGX1Supported = a&0x01 != 0 + rval.SGX2Supported = a&0x02 != 0 + rval.MaxEnclaveSizeNot64 = 1 << (d & 0xFF) // pow 2 + rval.MaxEnclaveSize64 = 1 << ((d >> 8) & 0xFF) // pow 2 + + return +} + +func support() Flags { + mfi := maxFunctionID() + vend := vendorID() + if mfi < 0x1 { + return 0 + } + rval := uint64(0) + _, _, c, d := cpuid(1) + if (d & (1 << 15)) != 0 { + rval |= CMOV + } + if (d & (1 << 23)) != 0 { + rval |= MMX + } + if (d & (1 << 25)) != 0 { + rval |= MMXEXT + } + if (d & (1 << 25)) != 0 { + rval |= SSE + } + if (d & (1 << 26)) != 0 { + rval |= SSE2 + } + if (c & 1) != 0 { + rval |= SSE3 + } + if (c & 0x00000200) != 0 { + rval |= SSSE3 + } + if (c & 0x00080000) != 0 { + rval |= SSE4 + } + if (c & 0x00100000) != 0 { + rval |= SSE42 + } + if (c & (1 << 25)) != 0 { + rval |= AESNI + } + if (c & (1 << 1)) != 0 { + rval |= CLMUL + } + if c&(1<<23) != 0 { + rval |= POPCNT + } + if c&(1<<30) != 0 { + rval |= RDRAND + } + if c&(1<<29) != 0 { + rval |= F16C + } + if c&(1<<13) != 0 { + rval |= CX16 + } + if vend == Intel && (d&(1<<28)) != 0 && mfi >= 4 { + if threadsPerCore() > 1 { + rval |= HTT + } + } + + // Check XGETBV, OXSAVE and AVX bits + if c&(1<<26) != 0 && c&(1<<27) != 0 && c&(1<<28) != 0 { + // Check for OS support + eax, _ := xgetbv(0) + if (eax & 0x6) == 0x6 { + rval |= AVX + if (c & 0x00001000) != 0 { + rval |= FMA3 + } + } + } + + // Check AVX2, AVX2 requires OS support, but BMI1/2 don't. + if mfi >= 7 { + _, ebx, ecx, edx := cpuidex(7, 0) + if (rval&AVX) != 0 && (ebx&0x00000020) != 0 { + rval |= AVX2 + } + if (ebx & 0x00000008) != 0 { + rval |= BMI1 + if (ebx & 0x00000100) != 0 { + rval |= BMI2 + } + } + if ebx&(1<<2) != 0 { + rval |= SGX + } + if ebx&(1<<4) != 0 { + rval |= HLE + } + if ebx&(1<<9) != 0 { + rval |= ERMS + } + if ebx&(1<<11) != 0 { + rval |= RTM + } + if ebx&(1<<14) != 0 { + rval |= MPX + } + if ebx&(1<<18) != 0 { + rval |= RDSEED + } + if ebx&(1<<19) != 0 { + rval |= ADX + } + if ebx&(1<<29) != 0 { + rval |= SHA + } + if edx&(1<<26) != 0 { + rval |= IBPB + } + if edx&(1<<27) != 0 { + rval |= STIBP + } + + // Only detect AVX-512 features if XGETBV is supported + if c&((1<<26)|(1<<27)) == (1<<26)|(1<<27) { + // Check for OS support + eax, _ := xgetbv(0) + + // Verify that XCR0[7:5] = ‘111b’ (OPMASK state, upper 256-bit of ZMM0-ZMM15 and + // ZMM16-ZMM31 state are enabled by OS) + /// and that XCR0[2:1] = ‘11b’ (XMM state and YMM state are enabled by OS). + if (eax>>5)&7 == 7 && (eax>>1)&3 == 3 { + if ebx&(1<<16) != 0 { + rval |= AVX512F + } + if ebx&(1<<17) != 0 { + rval |= AVX512DQ + } + if ebx&(1<<21) != 0 { + rval |= AVX512IFMA + } + if ebx&(1<<26) != 0 { + rval |= AVX512PF + } + if ebx&(1<<27) != 0 { + rval |= AVX512ER + } + if ebx&(1<<28) != 0 { + rval |= AVX512CD + } + if ebx&(1<<30) != 0 { + rval |= AVX512BW + } + if ebx&(1<<31) != 0 { + rval |= AVX512VL + } + // ecx + if ecx&(1<<1) != 0 { + rval |= AVX512VBMI + } + } + } + } + + if maxExtendedFunction() >= 0x80000001 { + _, _, c, d := cpuid(0x80000001) + if (c & (1 << 5)) != 0 { + rval |= LZCNT + rval |= POPCNT + } + if (d & (1 << 31)) != 0 { + rval |= AMD3DNOW + } + if (d & (1 << 30)) != 0 { + rval |= AMD3DNOWEXT + } + if (d & (1 << 23)) != 0 { + rval |= MMX + } + if (d & (1 << 22)) != 0 { + rval |= MMXEXT + } + if (c & (1 << 6)) != 0 { + rval |= SSE4A + } + if d&(1<<20) != 0 { + rval |= NX + } + if d&(1<<27) != 0 { + rval |= RDTSCP + } + + /* Allow for selectively disabling SSE2 functions on AMD processors + with SSE2 support but not SSE4a. This includes Athlon64, some + Opteron, and some Sempron processors. MMX, SSE, or 3DNow! are faster + than SSE2 often enough to utilize this special-case flag. + AV_CPU_FLAG_SSE2 and AV_CPU_FLAG_SSE2SLOW are both set in this case + so that SSE2 is used unless explicitly disabled by checking + AV_CPU_FLAG_SSE2SLOW. */ + if vendorID() != Intel && + rval&SSE2 != 0 && (c&0x00000040) == 0 { + rval |= SSE2SLOW + } + + /* XOP and FMA4 use the AVX instruction coding scheme, so they can't be + * used unless the OS has AVX support. */ + if (rval & AVX) != 0 { + if (c & 0x00000800) != 0 { + rval |= XOP + } + if (c & 0x00010000) != 0 { + rval |= FMA4 + } + } + + if vendorID() == Intel { + family, model := familyModel() + if family == 6 && (model == 9 || model == 13 || model == 14) { + /* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and + * 6/14 (core1 "yonah") theoretically support sse2, but it's + * usually slower than mmx. */ + if (rval & SSE2) != 0 { + rval |= SSE2SLOW + } + if (rval & SSE3) != 0 { + rval |= SSE3SLOW + } + } + /* The Atom processor has SSSE3 support, which is useful in many cases, + * but sometimes the SSSE3 version is slower than the SSE2 equivalent + * on the Atom, but is generally faster on other processors supporting + * SSSE3. This flag allows for selectively disabling certain SSSE3 + * functions on the Atom. */ + if family == 6 && model == 28 { + rval |= ATOM + } + } + } + return Flags(rval) +} + +func valAsString(values ...uint32) []byte { + r := make([]byte, 4*len(values)) + for i, v := range values { + dst := r[i*4:] + dst[0] = byte(v & 0xff) + dst[1] = byte((v >> 8) & 0xff) + dst[2] = byte((v >> 16) & 0xff) + dst[3] = byte((v >> 24) & 0xff) + switch { + case dst[0] == 0: + return r[:i*4] + case dst[1] == 0: + return r[:i*4+1] + case dst[2] == 0: + return r[:i*4+2] + case dst[3] == 0: + return r[:i*4+3] + } + } + return r +} |