| //===-- cpu_model.c - Support for __cpu_model builtin ------------*- C -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is based on LLVM's lib/Support/Host.cpp. |
| // It implements the operating system Host concept and builtin |
| // __cpu_model for the compiler_rt library, for x86 only. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #if (defined(__i386__) || defined(_M_IX86) || \ |
| defined(__x86_64__) || defined(_M_X64)) && \ |
| (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER)) |
| |
| #include <assert.h> |
| |
| #define bool int |
| #define true 1 |
| #define false 0 |
| |
| #ifdef _MSC_VER |
| #include <intrin.h> |
| #endif |
| |
| #ifndef __has_attribute |
| #define __has_attribute(attr) 0 |
| #endif |
| |
| enum VendorSignatures { |
| SIG_INTEL = 0x756e6547 /* Genu */, |
| SIG_AMD = 0x68747541 /* Auth */ |
| }; |
| |
| enum ProcessorVendors { |
| VENDOR_INTEL = 1, |
| VENDOR_AMD, |
| VENDOR_OTHER, |
| VENDOR_MAX |
| }; |
| |
| enum ProcessorTypes { |
| INTEL_BONNELL = 1, |
| INTEL_CORE2, |
| INTEL_COREI7, |
| AMDFAM10H, |
| AMDFAM15H, |
| INTEL_SILVERMONT, |
| INTEL_KNL, |
| AMD_BTVER1, |
| AMD_BTVER2, |
| AMDFAM17H, |
| INTEL_KNM, |
| INTEL_GOLDMONT, |
| INTEL_GOLDMONT_PLUS, |
| INTEL_TREMONT, |
| CPU_TYPE_MAX |
| }; |
| |
| enum ProcessorSubtypes { |
| INTEL_COREI7_NEHALEM = 1, |
| INTEL_COREI7_WESTMERE, |
| INTEL_COREI7_SANDYBRIDGE, |
| AMDFAM10H_BARCELONA, |
| AMDFAM10H_SHANGHAI, |
| AMDFAM10H_ISTANBUL, |
| AMDFAM15H_BDVER1, |
| AMDFAM15H_BDVER2, |
| AMDFAM15H_BDVER3, |
| AMDFAM15H_BDVER4, |
| AMDFAM17H_ZNVER1, |
| INTEL_COREI7_IVYBRIDGE, |
| INTEL_COREI7_HASWELL, |
| INTEL_COREI7_BROADWELL, |
| INTEL_COREI7_SKYLAKE, |
| INTEL_COREI7_SKYLAKE_AVX512, |
| INTEL_COREI7_CANNONLAKE, |
| INTEL_COREI7_ICELAKE_CLIENT, |
| INTEL_COREI7_ICELAKE_SERVER, |
| CPU_SUBTYPE_MAX |
| }; |
| |
| enum ProcessorFeatures { |
| FEATURE_CMOV = 0, |
| FEATURE_MMX, |
| FEATURE_POPCNT, |
| FEATURE_SSE, |
| FEATURE_SSE2, |
| FEATURE_SSE3, |
| FEATURE_SSSE3, |
| FEATURE_SSE4_1, |
| FEATURE_SSE4_2, |
| FEATURE_AVX, |
| FEATURE_AVX2, |
| FEATURE_SSE4_A, |
| FEATURE_FMA4, |
| FEATURE_XOP, |
| FEATURE_FMA, |
| FEATURE_AVX512F, |
| FEATURE_BMI, |
| FEATURE_BMI2, |
| FEATURE_AES, |
| FEATURE_PCLMUL, |
| FEATURE_AVX512VL, |
| FEATURE_AVX512BW, |
| FEATURE_AVX512DQ, |
| FEATURE_AVX512CD, |
| FEATURE_AVX512ER, |
| FEATURE_AVX512PF, |
| FEATURE_AVX512VBMI, |
| FEATURE_AVX512IFMA, |
| FEATURE_AVX5124VNNIW, |
| FEATURE_AVX5124FMAPS, |
| FEATURE_AVX512VPOPCNTDQ, |
| FEATURE_AVX512VBMI2, |
| FEATURE_GFNI, |
| FEATURE_VPCLMULQDQ, |
| FEATURE_AVX512VNNI, |
| FEATURE_AVX512BITALG |
| }; |
| |
| // The check below for i386 was copied from clang's cpuid.h (__get_cpuid_max). |
| // Check motivated by bug reports for OpenSSL crashing on CPUs without CPUID |
| // support. Consequently, for i386, the presence of CPUID is checked first |
| // via the corresponding eflags bit. |
| static bool isCpuIdSupported() { |
| #if defined(__GNUC__) || defined(__clang__) |
| #if defined(__i386__) |
| int __cpuid_supported; |
| __asm__(" pushfl\n" |
| " popl %%eax\n" |
| " movl %%eax,%%ecx\n" |
| " xorl $0x00200000,%%eax\n" |
| " pushl %%eax\n" |
| " popfl\n" |
| " pushfl\n" |
| " popl %%eax\n" |
| " movl $0,%0\n" |
| " cmpl %%eax,%%ecx\n" |
| " je 1f\n" |
| " movl $1,%0\n" |
| "1:" |
| : "=r"(__cpuid_supported) |
| : |
| : "eax", "ecx"); |
| if (!__cpuid_supported) |
| return false; |
| #endif |
| return true; |
| #endif |
| return true; |
| } |
| |
| // This code is copied from lib/Support/Host.cpp. |
| // Changes to either file should be mirrored in the other. |
| |
| /// getX86CpuIDAndInfo - Execute the specified cpuid and return the 4 values in |
| /// the specified arguments. If we can't run cpuid on the host, return true. |
| static bool getX86CpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX, |
| unsigned *rECX, unsigned *rEDX) { |
| #if defined(__GNUC__) || defined(__clang__) |
| #if defined(__x86_64__) |
| // gcc doesn't know cpuid would clobber ebx/rbx. Preserve it manually. |
| // FIXME: should we save this for Clang? |
| __asm__("movq\t%%rbx, %%rsi\n\t" |
| "cpuid\n\t" |
| "xchgq\t%%rbx, %%rsi\n\t" |
| : "=a"(*rEAX), "=S"(*rEBX), "=c"(*rECX), "=d"(*rEDX) |
| : "a"(value)); |
| return false; |
| #elif defined(__i386__) |
| __asm__("movl\t%%ebx, %%esi\n\t" |
| "cpuid\n\t" |
| "xchgl\t%%ebx, %%esi\n\t" |
| : "=a"(*rEAX), "=S"(*rEBX), "=c"(*rECX), "=d"(*rEDX) |
| : "a"(value)); |
| return false; |
| #else |
| return true; |
| #endif |
| #elif defined(_MSC_VER) |
| // The MSVC intrinsic is portable across x86 and x64. |
| int registers[4]; |
| __cpuid(registers, value); |
| *rEAX = registers[0]; |
| *rEBX = registers[1]; |
| *rECX = registers[2]; |
| *rEDX = registers[3]; |
| return false; |
| #else |
| return true; |
| #endif |
| } |
| |
| /// getX86CpuIDAndInfoEx - Execute the specified cpuid with subleaf and return |
| /// the 4 values in the specified arguments. If we can't run cpuid on the host, |
| /// return true. |
| static bool getX86CpuIDAndInfoEx(unsigned value, unsigned subleaf, |
| unsigned *rEAX, unsigned *rEBX, unsigned *rECX, |
| unsigned *rEDX) { |
| #if defined(__GNUC__) || defined(__clang__) |
| #if defined(__x86_64__) |
| // gcc doesn't know cpuid would clobber ebx/rbx. Preserve it manually. |
| // FIXME: should we save this for Clang? |
| __asm__("movq\t%%rbx, %%rsi\n\t" |
| "cpuid\n\t" |
| "xchgq\t%%rbx, %%rsi\n\t" |
| : "=a"(*rEAX), "=S"(*rEBX), "=c"(*rECX), "=d"(*rEDX) |
| : "a"(value), "c"(subleaf)); |
| return false; |
| #elif defined(__i386__) |
| __asm__("movl\t%%ebx, %%esi\n\t" |
| "cpuid\n\t" |
| "xchgl\t%%ebx, %%esi\n\t" |
| : "=a"(*rEAX), "=S"(*rEBX), "=c"(*rECX), "=d"(*rEDX) |
| : "a"(value), "c"(subleaf)); |
| return false; |
| #else |
| return true; |
| #endif |
| #elif defined(_MSC_VER) |
| int registers[4]; |
| __cpuidex(registers, value, subleaf); |
| *rEAX = registers[0]; |
| *rEBX = registers[1]; |
| *rECX = registers[2]; |
| *rEDX = registers[3]; |
| return false; |
| #else |
| return true; |
| #endif |
| } |
| |
| // Read control register 0 (XCR0). Used to detect features such as AVX. |
| static bool getX86XCR0(unsigned *rEAX, unsigned *rEDX) { |
| #if defined(__GNUC__) || defined(__clang__) |
| // Check xgetbv; this uses a .byte sequence instead of the instruction |
| // directly because older assemblers do not include support for xgetbv and |
| // there is no easy way to conditionally compile based on the assembler used. |
| __asm__(".byte 0x0f, 0x01, 0xd0" : "=a"(*rEAX), "=d"(*rEDX) : "c"(0)); |
| return false; |
| #elif defined(_MSC_FULL_VER) && defined(_XCR_XFEATURE_ENABLED_MASK) |
| unsigned long long Result = _xgetbv(_XCR_XFEATURE_ENABLED_MASK); |
| *rEAX = Result; |
| *rEDX = Result >> 32; |
| return false; |
| #else |
| return true; |
| #endif |
| } |
| |
| static void detectX86FamilyModel(unsigned EAX, unsigned *Family, |
| unsigned *Model) { |
| *Family = (EAX >> 8) & 0xf; // Bits 8 - 11 |
| *Model = (EAX >> 4) & 0xf; // Bits 4 - 7 |
| if (*Family == 6 || *Family == 0xf) { |
| if (*Family == 0xf) |
| // Examine extended family ID if family ID is F. |
| *Family += (EAX >> 20) & 0xff; // Bits 20 - 27 |
| // Examine extended model ID if family ID is 6 or F. |
| *Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19 |
| } |
| } |
| |
| static void |
| getIntelProcessorTypeAndSubtype(unsigned Family, unsigned Model, |
| unsigned Brand_id, unsigned Features, |
| unsigned *Type, unsigned *Subtype) { |
| if (Brand_id != 0) |
| return; |
| switch (Family) { |
| case 6: |
| switch (Model) { |
| case 0x0f: // Intel Core 2 Duo processor, Intel Core 2 Duo mobile |
| // processor, Intel Core 2 Quad processor, Intel Core 2 Quad |
| // mobile processor, Intel Core 2 Extreme processor, Intel |
| // Pentium Dual-Core processor, Intel Xeon processor, model |
| // 0Fh. All processors are manufactured using the 65 nm process. |
| case 0x16: // Intel Celeron processor model 16h. All processors are |
| // manufactured using the 65 nm process |
| case 0x17: // Intel Core 2 Extreme processor, Intel Xeon processor, model |
| // 17h. All processors are manufactured using the 45 nm process. |
| // |
| // 45nm: Penryn , Wolfdale, Yorkfield (XE) |
| case 0x1d: // Intel Xeon processor MP. All processors are manufactured using |
| // the 45 nm process. |
| *Type = INTEL_CORE2; // "penryn" |
| break; |
| case 0x1a: // Intel Core i7 processor and Intel Xeon processor. All |
| // processors are manufactured using the 45 nm process. |
| case 0x1e: // Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz. |
| // As found in a Summer 2010 model iMac. |
| case 0x1f: |
| case 0x2e: // Nehalem EX |
| *Type = INTEL_COREI7; // "nehalem" |
| *Subtype = INTEL_COREI7_NEHALEM; |
| break; |
| case 0x25: // Intel Core i7, laptop version. |
| case 0x2c: // Intel Core i7 processor and Intel Xeon processor. All |
| // processors are manufactured using the 32 nm process. |
| case 0x2f: // Westmere EX |
| *Type = INTEL_COREI7; // "westmere" |
| *Subtype = INTEL_COREI7_WESTMERE; |
| break; |
| case 0x2a: // Intel Core i7 processor. All processors are manufactured |
| // using the 32 nm process. |
| case 0x2d: |
| *Type = INTEL_COREI7; //"sandybridge" |
| *Subtype = INTEL_COREI7_SANDYBRIDGE; |
| break; |
| case 0x3a: |
| case 0x3e: // Ivy Bridge EP |
| *Type = INTEL_COREI7; // "ivybridge" |
| *Subtype = INTEL_COREI7_IVYBRIDGE; |
| break; |
| |
| // Haswell: |
| case 0x3c: |
| case 0x3f: |
| case 0x45: |
| case 0x46: |
| *Type = INTEL_COREI7; // "haswell" |
| *Subtype = INTEL_COREI7_HASWELL; |
| break; |
| |
| // Broadwell: |
| case 0x3d: |
| case 0x47: |
| case 0x4f: |
| case 0x56: |
| *Type = INTEL_COREI7; // "broadwell" |
| *Subtype = INTEL_COREI7_BROADWELL; |
| break; |
| |
| // Skylake: |
| case 0x4e: // Skylake mobile |
| case 0x5e: // Skylake desktop |
| case 0x8e: // Kaby Lake mobile |
| case 0x9e: // Kaby Lake desktop |
| *Type = INTEL_COREI7; // "skylake" |
| *Subtype = INTEL_COREI7_SKYLAKE; |
| break; |
| |
| // Skylake Xeon: |
| case 0x55: |
| *Type = INTEL_COREI7; |
| *Subtype = INTEL_COREI7_SKYLAKE_AVX512; // "skylake-avx512" |
| break; |
| |
| // Cannonlake: |
| case 0x66: |
| *Type = INTEL_COREI7; |
| *Subtype = INTEL_COREI7_CANNONLAKE; // "cannonlake" |
| break; |
| |
| case 0x1c: // Most 45 nm Intel Atom processors |
| case 0x26: // 45 nm Atom Lincroft |
| case 0x27: // 32 nm Atom Medfield |
| case 0x35: // 32 nm Atom Midview |
| case 0x36: // 32 nm Atom Midview |
| *Type = INTEL_BONNELL; |
| break; // "bonnell" |
| |
| // Atom Silvermont codes from the Intel software optimization guide. |
| case 0x37: |
| case 0x4a: |
| case 0x4d: |
| case 0x5a: |
| case 0x5d: |
| case 0x4c: // really airmont |
| *Type = INTEL_SILVERMONT; |
| break; // "silvermont" |
| // Goldmont: |
| case 0x5c: // Apollo Lake |
| case 0x5f: // Denverton |
| *Type = INTEL_GOLDMONT; |
| break; // "goldmont" |
| case 0x7a: |
| *Type = INTEL_GOLDMONT_PLUS; |
| break; |
| |
| case 0x57: |
| *Type = INTEL_KNL; // knl |
| break; |
| |
| case 0x85: |
| *Type = INTEL_KNM; // knm |
| break; |
| |
| default: // Unknown family 6 CPU. |
| break; |
| break; |
| } |
| default: |
| break; // Unknown. |
| } |
| } |
| |
| static void getAMDProcessorTypeAndSubtype(unsigned Family, unsigned Model, |
| unsigned Features, unsigned *Type, |
| unsigned *Subtype) { |
| // FIXME: this poorly matches the generated SubtargetFeatureKV table. There |
| // appears to be no way to generate the wide variety of AMD-specific targets |
| // from the information returned from CPUID. |
| switch (Family) { |
| case 16: |
| *Type = AMDFAM10H; // "amdfam10" |
| switch (Model) { |
| case 2: |
| *Subtype = AMDFAM10H_BARCELONA; |
| break; |
| case 4: |
| *Subtype = AMDFAM10H_SHANGHAI; |
| break; |
| case 8: |
| *Subtype = AMDFAM10H_ISTANBUL; |
| break; |
| } |
| break; |
| case 20: |
| *Type = AMD_BTVER1; |
| break; // "btver1"; |
| case 21: |
| *Type = AMDFAM15H; |
| if (Model >= 0x60 && Model <= 0x7f) { |
| *Subtype = AMDFAM15H_BDVER4; |
| break; // "bdver4"; 60h-7Fh: Excavator |
| } |
| if (Model >= 0x30 && Model <= 0x3f) { |
| *Subtype = AMDFAM15H_BDVER3; |
| break; // "bdver3"; 30h-3Fh: Steamroller |
| } |
| if ((Model >= 0x10 && Model <= 0x1f) || Model == 0x02) { |
| *Subtype = AMDFAM15H_BDVER2; |
| break; // "bdver2"; 02h, 10h-1Fh: Piledriver |
| } |
| if (Model <= 0x0f) { |
| *Subtype = AMDFAM15H_BDVER1; |
| break; // "bdver1"; 00h-0Fh: Bulldozer |
| } |
| break; |
| case 22: |
| *Type = AMD_BTVER2; |
| break; // "btver2" |
| case 23: |
| *Type = AMDFAM17H; |
| *Subtype = AMDFAM17H_ZNVER1; |
| break; |
| default: |
| break; // "generic" |
| } |
| } |
| |
| static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf, |
| unsigned *FeaturesOut, |
| unsigned *Features2Out) { |
| unsigned Features = 0; |
| unsigned Features2 = 0; |
| unsigned EAX, EBX; |
| |
| #define setFeature(F) \ |
| do { \ |
| if (F < 32) \ |
| Features |= 1U << (F & 0x1f); \ |
| else if (F < 64) \ |
| Features2 |= 1U << ((F - 32) & 0x1f); \ |
| } while (0) |
| |
| if ((EDX >> 15) & 1) |
| setFeature(FEATURE_CMOV); |
| if ((EDX >> 23) & 1) |
| setFeature(FEATURE_MMX); |
| if ((EDX >> 25) & 1) |
| setFeature(FEATURE_SSE); |
| if ((EDX >> 26) & 1) |
| setFeature(FEATURE_SSE2); |
| |
| if ((ECX >> 0) & 1) |
| setFeature(FEATURE_SSE3); |
| if ((ECX >> 1) & 1) |
| setFeature(FEATURE_PCLMUL); |
| if ((ECX >> 9) & 1) |
| setFeature(FEATURE_SSSE3); |
| if ((ECX >> 12) & 1) |
| setFeature(FEATURE_FMA); |
| if ((ECX >> 19) & 1) |
| setFeature(FEATURE_SSE4_1); |
| if ((ECX >> 20) & 1) |
| setFeature(FEATURE_SSE4_2); |
| if ((ECX >> 23) & 1) |
| setFeature(FEATURE_POPCNT); |
| if ((ECX >> 25) & 1) |
| setFeature(FEATURE_AES); |
| |
| // If CPUID indicates support for XSAVE, XRESTORE and AVX, and XGETBV |
| // indicates that the AVX registers will be saved and restored on context |
| // switch, then we have full AVX support. |
| const unsigned AVXBits = (1 << 27) | (1 << 28); |
| bool HasAVX = ((ECX & AVXBits) == AVXBits) && !getX86XCR0(&EAX, &EDX) && |
| ((EAX & 0x6) == 0x6); |
| bool HasAVX512Save = HasAVX && ((EAX & 0xe0) == 0xe0); |
| |
| if (HasAVX) |
| setFeature(FEATURE_AVX); |
| |
| bool HasLeaf7 = |
| MaxLeaf >= 0x7 && !getX86CpuIDAndInfoEx(0x7, 0x0, &EAX, &EBX, &ECX, &EDX); |
| |
| if (HasLeaf7 && ((EBX >> 3) & 1)) |
| setFeature(FEATURE_BMI); |
| if (HasLeaf7 && ((EBX >> 5) & 1) && HasAVX) |
| setFeature(FEATURE_AVX2); |
| if (HasLeaf7 && ((EBX >> 9) & 1)) |
| setFeature(FEATURE_BMI2); |
| if (HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512F); |
| if (HasLeaf7 && ((EBX >> 17) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512DQ); |
| if (HasLeaf7 && ((EBX >> 21) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512IFMA); |
| if (HasLeaf7 && ((EBX >> 26) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512PF); |
| if (HasLeaf7 && ((EBX >> 27) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512ER); |
| if (HasLeaf7 && ((EBX >> 28) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512CD); |
| if (HasLeaf7 && ((EBX >> 30) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512BW); |
| if (HasLeaf7 && ((EBX >> 31) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512VL); |
| |
| if (HasLeaf7 && ((ECX >> 1) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512VBMI); |
| if (HasLeaf7 && ((ECX >> 6) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512VBMI2); |
| if (HasLeaf7 && ((ECX >> 8) & 1)) |
| setFeature(FEATURE_GFNI); |
| if (HasLeaf7 && ((ECX >> 10) & 1) && HasAVX) |
| setFeature(FEATURE_VPCLMULQDQ); |
| if (HasLeaf7 && ((ECX >> 11) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512VNNI); |
| if (HasLeaf7 && ((ECX >> 12) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512BITALG); |
| if (HasLeaf7 && ((ECX >> 14) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX512VPOPCNTDQ); |
| |
| if (HasLeaf7 && ((EDX >> 2) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX5124VNNIW); |
| if (HasLeaf7 && ((EDX >> 3) & 1) && HasAVX512Save) |
| setFeature(FEATURE_AVX5124FMAPS); |
| |
| unsigned MaxExtLevel; |
| getX86CpuIDAndInfo(0x80000000, &MaxExtLevel, &EBX, &ECX, &EDX); |
| |
| bool HasExtLeaf1 = MaxExtLevel >= 0x80000001 && |
| !getX86CpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX); |
| if (HasExtLeaf1 && ((ECX >> 6) & 1)) |
| setFeature(FEATURE_SSE4_A); |
| if (HasExtLeaf1 && ((ECX >> 11) & 1)) |
| setFeature(FEATURE_XOP); |
| if (HasExtLeaf1 && ((ECX >> 16) & 1)) |
| setFeature(FEATURE_FMA4); |
| |
| *FeaturesOut = Features; |
| *Features2Out = Features2; |
| #undef setFeature |
| } |
| |
| #if defined(HAVE_INIT_PRIORITY) |
| #define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101)) |
| #elif __has_attribute(__constructor__) |
| #define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__)) |
| #else |
| // FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that |
| // this runs during initialization. |
| #define CONSTRUCTOR_ATTRIBUTE |
| #endif |
| |
| int __cpu_indicator_init(void) CONSTRUCTOR_ATTRIBUTE; |
| |
| struct __processor_model { |
| unsigned int __cpu_vendor; |
| unsigned int __cpu_type; |
| unsigned int __cpu_subtype; |
| unsigned int __cpu_features[1]; |
| } __cpu_model = {0, 0, 0, {0}}; |
| unsigned int __cpu_features2; |
| |
| /* A constructor function that is sets __cpu_model and __cpu_features2 with |
| the right values. This needs to run only once. This constructor is |
| given the highest priority and it should run before constructors without |
| the priority set. However, it still runs after ifunc initializers and |
| needs to be called explicitly there. */ |
| |
| int CONSTRUCTOR_ATTRIBUTE |
| __cpu_indicator_init(void) { |
| unsigned EAX, EBX, ECX, EDX; |
| unsigned MaxLeaf = 5; |
| unsigned Vendor; |
| unsigned Model, Family, Brand_id; |
| unsigned Features = 0; |
| unsigned Features2 = 0; |
| |
| /* This function needs to run just once. */ |
| if (__cpu_model.__cpu_vendor) |
| return 0; |
| |
| if (!isCpuIdSupported()) |
| return -1; |
| |
| /* Assume cpuid insn present. Run in level 0 to get vendor id. */ |
| if (getX86CpuIDAndInfo(0, &MaxLeaf, &Vendor, &ECX, &EDX) || MaxLeaf < 1) { |
| __cpu_model.__cpu_vendor = VENDOR_OTHER; |
| return -1; |
| } |
| getX86CpuIDAndInfo(1, &EAX, &EBX, &ECX, &EDX); |
| detectX86FamilyModel(EAX, &Family, &Model); |
| Brand_id = EBX & 0xff; |
| |
| /* Find available features. */ |
| getAvailableFeatures(ECX, EDX, MaxLeaf, &Features, &Features2); |
| __cpu_model.__cpu_features[0] = Features; |
| __cpu_features2 = Features2; |
| |
| if (Vendor == SIG_INTEL) { |
| /* Get CPU type. */ |
| getIntelProcessorTypeAndSubtype(Family, Model, Brand_id, Features, |
| &(__cpu_model.__cpu_type), |
| &(__cpu_model.__cpu_subtype)); |
| __cpu_model.__cpu_vendor = VENDOR_INTEL; |
| } else if (Vendor == SIG_AMD) { |
| /* Get CPU type. */ |
| getAMDProcessorTypeAndSubtype(Family, Model, Features, |
| &(__cpu_model.__cpu_type), |
| &(__cpu_model.__cpu_subtype)); |
| __cpu_model.__cpu_vendor = VENDOR_AMD; |
| } else |
| __cpu_model.__cpu_vendor = VENDOR_OTHER; |
| |
| assert(__cpu_model.__cpu_vendor < VENDOR_MAX); |
| assert(__cpu_model.__cpu_type < CPU_TYPE_MAX); |
| assert(__cpu_model.__cpu_subtype < CPU_SUBTYPE_MAX); |
| |
| return 0; |
| } |
| |
| #endif |
