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ext-cryptopp/cpu.cpp
Jeffrey Walton 51db9eb436
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2018-01-24 20:04:16 -05:00

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// cpu.cpp - originally written and placed in the public domain by Wei Dai
#include "pch.h"
#include "config.h"
#ifndef EXCEPTION_EXECUTE_HANDLER
# define EXCEPTION_EXECUTE_HANDLER 1
#endif
#ifndef CRYPTOPP_IMPORTS
#include "cpu.h"
#include "misc.h"
#include "stdcpp.h"
#ifdef _AIX
# include <sys/systemcfg.h>
#endif
#ifdef __linux__
# include <unistd.h>
#endif
// Capability queries, requires Glibc 2.16, http://lwn.net/Articles/519085/
// CRYPTOPP_GLIBC_VERSION not used because config.h is missing <feature.h>
#if (((__GLIBC__ * 100) + __GLIBC_MINOR__) >= 216)
# define CRYPTOPP_GETAUXV_AVAILABLE 1
#endif
#if CRYPTOPP_GETAUXV_AVAILABLE
# include <sys/auxv.h>
#else
unsigned long int getauxval(unsigned long int) { return 0; }
#endif
#if defined(__APPLE__) && (defined(__aarch64__) || defined(__POWERPC__))
# include <sys/utsname.h>
#endif
// The cpu-features header and source file are located in $ANDROID_NDK_ROOT/sources/android/cpufeatures
// setenv-android.sh will copy the header and source file into PWD and the makefile will build it in place.
#if defined(__ANDROID__)
# include "cpu-features.h"
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
# include <signal.h>
# include <setjmp.h>
#endif
NAMESPACE_BEGIN(CryptoPP)
#ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
};
extern "C"
{
static jmp_buf s_jmpNoCPUID;
static void SigIllHandlerCPUID(int unused)
{
CRYPTOPP_UNUSED(unused);
longjmp(s_jmpNoCPUID, 1);
}
}
#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
// *************************** IA-32 CPUs ***************************
#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
extern bool CPU_ProbeSSE2();
#if _MSC_VER >= 1500
inline bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
__cpuidex((int *)output, func, subfunc);
return true;
}
#elif _MSC_VER >= 1400 && CRYPTOPP_BOOL_X64
inline bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
if (subfunc != 0)
return false;
__cpuid((int *)output, func);
return true;
}
#else
// Borland/Embarcadero and Issue 498
// cpu.cpp (131): E2211 Inline assembly not allowed in inline and template functions
bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
#if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY) || defined(__BORLANDC__)
__try
{
// Borland/Embarcadero and Issue 500
// Local variables for cpuid output
word32 a, b, c, d;
__asm
{
mov eax, func
mov ecx, subfunc
cpuid
mov [a], eax
mov [b], ebx
mov [c], ecx
mov [d], edx
}
output[0] = a;
output[1] = b;
output[2] = c;
output[3] = d;
}
// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
// func = 0 returns the highest basic function understood in EAX. If the CPU does
// not return non-0, then it is mostly useless. The code below converts basic
// function value to a true/false return value.
if(func == 0)
return output[0] != 0;
return true;
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile bool result = true;
volatile SigHandler oldHandler = signal(SIGILL, SigIllHandlerCPUID);
if (oldHandler == SIG_ERR)
return false;
# ifndef __MINGW32__
volatile sigset_t oldMask;
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask) != 0)
return false;
# endif
if (setjmp(s_jmpNoCPUID))
result = false;
else
{
asm volatile
(
// save ebx in case -fPIC is being used
// TODO: this might need an early clobber on EDI.
# if CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
"pushq %%rbx; cpuid; mov %%ebx, %%edi; popq %%rbx"
# else
"push %%ebx; cpuid; mov %%ebx, %%edi; pop %%ebx"
# endif
: "=a" (output[0]), "=D" (output[1]), "=c" (output[2]), "=d" (output[3])
: "a" (func), "c" (subfunc)
: "cc"
);
}
# ifndef __MINGW32__
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
# endif
signal(SIGILL, oldHandler);
return result;
#endif
}
#endif
bool CRYPTOPP_SECTION_INIT g_x86DetectionDone = false;
bool CRYPTOPP_SECTION_INIT CRYPTOPP_SECTION_INIT g_hasSSE2 = false, CRYPTOPP_SECTION_INIT g_hasSSSE3 = false;
bool CRYPTOPP_SECTION_INIT g_hasSSE41 = false, CRYPTOPP_SECTION_INIT g_hasSSE42 = false;
bool CRYPTOPP_SECTION_INIT g_hasAESNI = false, CRYPTOPP_SECTION_INIT g_hasCLMUL = false;
bool CRYPTOPP_SECTION_INIT g_hasADX = false, CRYPTOPP_SECTION_INIT g_hasSHA = false;
bool CRYPTOPP_SECTION_INIT g_hasRDRAND = false, CRYPTOPP_SECTION_INIT g_hasRDSEED = false, CRYPTOPP_SECTION_INIT g_isP4 = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockRNG = false, CRYPTOPP_SECTION_INIT g_hasPadlockACE = false, CRYPTOPP_SECTION_INIT g_hasPadlockACE2 = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockPHE = false, CRYPTOPP_SECTION_INIT g_hasPadlockPMM = false;
word32 CRYPTOPP_SECTION_INIT g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
static inline bool IsIntel(const word32 output[4])
{
// This is the "GenuineIntel" string
return (output[1] /*EBX*/ == 0x756e6547) &&
(output[2] /*ECX*/ == 0x6c65746e) &&
(output[3] /*EDX*/ == 0x49656e69);
}
static inline bool IsAMD(const word32 output[4])
{
// This is the "AuthenticAMD" string. Some early K5's can return "AMDisbetter!"
return (output[1] /*EBX*/ == 0x68747541) &&
(output[2] /*ECX*/ == 0x444D4163) &&
(output[3] /*EDX*/ == 0x69746E65);
}
static inline bool IsVIA(const word32 output[4])
{
// This is the "CentaurHauls" string. Some non-PadLock's can return "VIA VIA VIA "
return (output[1] /*EBX*/ == 0x746e6543) &&
(output[2] /*ECX*/ == 0x736c7561) &&
(output[3] /*EDX*/ == 0x48727561);
}
void DetectX86Features()
{
// Coverity finding CID 171239...
word32 cpuid0[4]={0}, cpuid1[4]={0}, cpuid2[4]={0};
if (!CpuId(0, 0, cpuid0))
return;
if (!CpuId(1, 0, cpuid1))
return;
// cpuid1[2] & (1 << 27) is XSAVE/XRESTORE and signals OS support for SSE; use it to avoid probes.
// See http://github.com/weidai11/cryptopp/issues/511 and http://stackoverflow.com/a/22521619/608639
if ((cpuid1[3] & (1 << 26)) != 0)
g_hasSSE2 = ((cpuid1[2] & (1 << 27)) != 0) || CPU_ProbeSSE2();
g_hasSSSE3 = g_hasSSE2 && ((cpuid1[2] & (1<< 9)) != 0);
g_hasSSE41 = g_hasSSE2 && ((cpuid1[2] & (1<<19)) != 0);
g_hasSSE42 = g_hasSSE2 && ((cpuid1[2] & (1<<20)) != 0);
g_hasAESNI = g_hasSSE2 && ((cpuid1[2] & (1<<25)) != 0);
g_hasCLMUL = g_hasSSE2 && ((cpuid1[2] & (1<< 1)) != 0);
if (IsIntel(cpuid0))
{
CRYPTOPP_CONSTANT(RDRAND_FLAG = (1 << 30))
CRYPTOPP_CONSTANT(RDSEED_FLAG = (1 << 18))
CRYPTOPP_CONSTANT( ADX_FLAG = (1 << 19))
CRYPTOPP_CONSTANT( SHA_FLAG = (1 << 29))
g_isP4 = ((cpuid1[0] >> 8) & 0xf) == 0xf;
g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
g_hasRDRAND = (cpuid1[2] /*ECX*/ & RDRAND_FLAG) != 0;
if (cpuid0[0] /*EAX*/ >= 7)
{
if (CpuId(7, 0, cpuid2))
{
g_hasRDSEED = (cpuid2[1] /*EBX*/ & RDSEED_FLAG) != 0;
g_hasADX = (cpuid2[1] /*EBX*/ & ADX_FLAG) != 0;
g_hasSHA = (cpuid2[1] /*EBX*/ & SHA_FLAG) != 0;
}
}
}
else if (IsAMD(cpuid0))
{
CRYPTOPP_CONSTANT(RDRAND_FLAG = (1 << 30))
CRYPTOPP_CONSTANT(RDSEED_FLAG = (1 << 18))
CRYPTOPP_CONSTANT( ADX_FLAG = (1 << 19))
CRYPTOPP_CONSTANT( SHA_FLAG = (1 << 29))
CpuId(0x80000005, 0, cpuid2);
g_cacheLineSize = GETBYTE(cpuid2[2], 0);
g_hasRDRAND = (cpuid1[2] /*ECX*/ & RDRAND_FLAG) != 0;
if (cpuid0[0] /*EAX*/ >= 7)
{
if (CpuId(7, 0, cpuid2))
{
g_hasRDSEED = (cpuid2[1] /*EBX*/ & RDSEED_FLAG) != 0;
g_hasADX = (cpuid2[1] /*EBX*/ & ADX_FLAG) != 0;
g_hasSHA = (cpuid2[1] /*EBX*/ & SHA_FLAG) != 0;
}
}
}
else if (IsVIA(cpuid0))
{
CRYPTOPP_CONSTANT( RNG_FLAGS = (0x3 << 2))
CRYPTOPP_CONSTANT( ACE_FLAGS = (0x3 << 6))
CRYPTOPP_CONSTANT(ACE2_FLAGS = (0x3 << 8))
CRYPTOPP_CONSTANT( PHE_FLAGS = (0x3 << 10))
CRYPTOPP_CONSTANT( PMM_FLAGS = (0x3 << 12))
CpuId(0xC0000000, 0, cpuid2);
if (cpuid2[0] >= 0xC0000001)
{
// Extended features available
CpuId(0xC0000001, 0, cpuid2);
g_hasPadlockRNG = (cpuid2[3] /*EDX*/ & RNG_FLAGS) != 0;
g_hasPadlockACE = (cpuid2[3] /*EDX*/ & ACE_FLAGS) != 0;
g_hasPadlockACE2 = (cpuid2[3] /*EDX*/ & ACE2_FLAGS) != 0;
g_hasPadlockPHE = (cpuid2[3] /*EDX*/ & PHE_FLAGS) != 0;
g_hasPadlockPMM = (cpuid2[3] /*EDX*/ & PMM_FLAGS) != 0;
}
}
if (!g_cacheLineSize)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
*const_cast<volatile bool*>(&g_x86DetectionDone) = true;
}
// *************************** ARM-32, Aarch32 and Aarch64 ***************************
#elif (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64)
bool CRYPTOPP_SECTION_INIT g_ArmDetectionDone = false;
bool CRYPTOPP_SECTION_INIT g_hasNEON = false, CRYPTOPP_SECTION_INIT g_hasPMULL = false, CRYPTOPP_SECTION_INIT g_hasCRC32 = false;
bool CRYPTOPP_SECTION_INIT g_hasAES = false, CRYPTOPP_SECTION_INIT g_hasSHA1 = false, CRYPTOPP_SECTION_INIT g_hasSHA2 = false;
word32 CRYPTOPP_SECTION_INIT g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
// ARM does not have an unprivliged equivalent to CPUID on IA-32. We have to jump through some
// hoops to detect features on a wide array of platforms. Our strategy is two part. First,
// attempt to *Query* the OS for a feature, like using getauxval on Linux. If that fails,
// then *Probe* the cpu executing an instruction and an observe a SIGILL if unsupported.
// The probes are in source files where compilation options like -march=armv8-a+crc make
// intrinsics available. They are expensive when compared to a standard OS feature query.
// Always perform the feature quesry first. For Linux see
// http://sourceware.org/ml/libc-help/2017-08/msg00012.html
// Avoid probes on Apple platforms because Apple's signal handling for SIGILLs appears broken.
// We are trying to figure out a way to feature test without probes. Also see
// http://stackoverflow.com/a/11197770/608639 and
// http://gist.github.com/erkanyildiz/390a480f27e86f8cd6ba
extern bool CPU_ProbeNEON();
extern bool CPU_ProbeCRC32();
extern bool CPU_ProbeAES();
extern bool CPU_ProbeSHA1();
extern bool CPU_ProbeSHA2();
extern bool CPU_ProbePMULL();
#ifndef HWCAP_ASIMD
# define HWCAP_ASIMD (1 << 1)
#endif
#ifndef HWCAP_ARM_NEON
# define HWCAP_ARM_NEON 4096
#endif
#ifndef HWCAP_CRC32
# define HWCAP_CRC32 (1 << 7)
#endif
#ifndef HWCAP2_CRC32
# define HWCAP2_CRC32 (1 << 4)
#endif
#ifndef HWCAP_PMULL
# define HWCAP_PMULL (1 << 4)
#endif
#ifndef HWCAP2_PMULL
# define HWCAP2_PMULL (1 << 1)
#endif
#ifndef HWCAP_AES
# define HWCAP_AES (1 << 3)
#endif
#ifndef HWCAP2_AES
# define HWCAP2_AES (1 << 0)
#endif
#ifndef HWCAP_SHA1
# define HWCAP_SHA1 (1 << 5)
#endif
#ifndef HWCAP_SHA2
# define HWCAP_SHA2 (1 << 6)
#endif
#ifndef HWCAP2_SHA1
# define HWCAP2_SHA1 (1 << 2)
#endif
#ifndef HWCAP2_SHA2
# define HWCAP2_SHA2 (1 << 3)
#endif
inline bool CPU_QueryNEON()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_ASIMD))
return true;
#elif defined(__ANDROID__) && defined(__arm__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_ASIMD)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_ASIMD)
return true;
#elif defined(__linux__) && defined(__arm__)
if (getauxval(AT_HWCAP) & HWCAP_ARM_NEON)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// Core feature set for Aarch32 and Aarch64.
return true;
#endif
return false;
}
inline bool CPU_QueryCRC32()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_CRC32))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_CRC32))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_CRC32)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_CRC32)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// No compiler support. CRC intrinsics result in a failed compiled.
return false;
#endif
return false;
}
inline bool CPU_QueryPMULL()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_PMULL))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_PMULL))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_PMULL)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_PMULL)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// No compiler support. PMULL intrinsics result in a failed compiled.
return false;
#endif
return false;
}
inline bool CPU_QueryAES()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_AES))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_AES))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_AES)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_AES)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// http://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
struct utsname systemInfo;
systemInfo.machine[0] = '\0';
uname(&systemInfo);
// The machine strings below are known ARM8 devices
std::string machine(systemInfo.machine);
if (machine.substr(0, 7) == "iPhone6" || machine.substr(0, 7) == "iPhone7" ||
machine.substr(0, 7) == "iPhone8" || machine.substr(0, 7) == "iPhone9" ||
machine.substr(0, 5) == "iPad4" || machine.substr(0, 5) == "iPad5" ||
machine.substr(0, 5) == "iPad6" || machine.substr(0, 5) == "iPad7")
{
return true;
}
#endif
return false;
}
inline bool CPU_QuerySHA1()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA1))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA1))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_SHA1)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_SHA1)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// http://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
struct utsname systemInfo;
systemInfo.machine[0] = '\0';
uname(&systemInfo);
// The machine strings below are known ARM8 devices
std::string machine(systemInfo.machine);
if (machine.substr(0, 7) == "iPhone6" || machine.substr(0, 7) == "iPhone7" ||
machine.substr(0, 7) == "iPhone8" || machine.substr(0, 7) == "iPhone9" ||
machine.substr(0, 5) == "iPad4" || machine.substr(0, 5) == "iPad5" ||
machine.substr(0, 5) == "iPad6" || machine.substr(0, 5) == "iPad7")
{
return true;
}
#endif
return false;
}
inline bool CPU_QuerySHA2()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA2))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if ((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA2))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if (getauxval(AT_HWCAP) & HWCAP_SHA2)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if (getauxval(AT_HWCAP2) & HWCAP2_SHA2)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// http://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
struct utsname systemInfo;
systemInfo.machine[0] = '\0';
uname(&systemInfo);
// The machine strings below are known ARM8 devices
std::string machine(systemInfo.machine);
if (machine.substr(0, 7) == "iPhone6" || machine.substr(0, 7) == "iPhone7" ||
machine.substr(0, 7) == "iPhone8" || machine.substr(0, 7) == "iPhone9" ||
machine.substr(0, 5) == "iPad4" || machine.substr(0, 5) == "iPad5" ||
machine.substr(0, 5) == "iPad6" || machine.substr(0, 5) == "iPad7")
{
return true;
}
#endif
return false;
}
void DetectArmFeatures()
{
// The CPU_ProbeXXX's return false for OSes which
// can't tolerate SIGILL-based probes
g_hasNEON = CPU_QueryNEON() || CPU_ProbeNEON();
g_hasCRC32 = CPU_QueryCRC32() || CPU_ProbeCRC32();
g_hasPMULL = CPU_QueryPMULL() || CPU_ProbePMULL();
g_hasAES = CPU_QueryAES() || CPU_ProbeAES();
g_hasSHA1 = CPU_QuerySHA1() || CPU_ProbeSHA1();
g_hasSHA2 = CPU_QuerySHA2() || CPU_ProbeSHA2();
#if defined(__linux__) && defined(_SC_LEVEL1_DCACHE_LINESIZE)
g_cacheLineSize = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
#endif
if (!g_cacheLineSize)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
*const_cast<volatile bool*>(&g_ArmDetectionDone) = true;
}
// *************************** PowerPC and PowerPC64 ***************************
#elif (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
bool CRYPTOPP_SECTION_INIT g_PowerpcDetectionDone = false;
bool CRYPTOPP_SECTION_INIT g_hasAltivec = false, CRYPTOPP_SECTION_INIT g_hasPower7 = false, CRYPTOPP_SECTION_INIT g_hasPower8 = false;
bool CRYPTOPP_SECTION_INIT g_hasAES = false, CRYPTOPP_SECTION_INIT g_hasSHA256 = false, CRYPTOPP_SECTION_INIT g_hasSHA512 = false;
word32 CRYPTOPP_SECTION_INIT g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
extern bool CPU_ProbeAltivec();
extern bool CPU_ProbePower7();
extern bool CPU_ProbePower8();
extern bool CPU_ProbeAES();
extern bool CPU_ProbeSHA256();
extern bool CPU_ProbeSHA512();
#ifndef PPC_FEATURE_HAS_ALTIVEC
# define PPC_FEATURE_HAS_ALTIVEC 0x10000000
#endif
#ifndef PPC_FEATURE_ARCH_2_06
# define PPC_FEATURE_ARCH_2_06 0x00000100
#endif
#ifndef PPC_FEATURE2_ARCH_2_07
# define PPC_FEATURE2_ARCH_2_07 0x80000000
#endif
#ifndef PPC_FEATURE2_VEC_CRYPTO
# define PPC_FEATURE2_VEC_CRYPTO 0x02000000
#endif
inline bool CPU_QueryAltivec()
{
#if defined(__linux__)
if (getauxval(AT_HWCAP) & PPC_FEATURE_HAS_ALTIVEC)
return true;
#elif defined(__APPLE__) && defined(__POWERPC__)
// http://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
struct utsname systemInfo;
systemInfo.machine[0] = '\0';
uname(&systemInfo);
// The machine strings below are known PPC machines
std::string machine(systemInfo.machine);
if (machine.substr(0, 15) == "Power Macintosh")
{
return true;
}
#endif
return false;
}
inline bool CPU_QueryPower7()
{
// Power7 and ISA 2.06
#if defined(__linux__)
if (getauxval(AT_HWCAP2) & PPC_FEATURE_ARCH_2_06)
return true;
#endif
return false;
}
inline bool CPU_QueryPower8()
{
// Power8 and ISA 2.07 provide in-core crypto.
#if defined(__linux__)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07)
return true;
#endif
return false;
}
inline bool CPU_QueryAES()
{
// Power8 and ISA 2.07 provide in-core crypto. Glibc
// 2.24 or higher is required for PPC_FEATURE2_VEC_CRYPTO.
#if defined(__linux__)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_VEC_CRYPTO)
return true;
//if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07)
// return true;
#endif
return false;
}
inline bool CPU_QuerySHA256()
{
// Power8 and ISA 2.07 provide in-core crypto. Glibc
// 2.24 or higher is required for PPC_FEATURE2_VEC_CRYPTO.
#if defined(__linux__)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_VEC_CRYPTO)
return true;
//if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07)
// return true;
#endif
return false;
}
inline bool CPU_QuerySHA512()
{
// Power8 and ISA 2.07 provide in-core crypto. Glibc
// 2.24 or higher is required for PPC_FEATURE2_VEC_CRYPTO.
#if defined(__linux__)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_VEC_CRYPTO)
return true;
//if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07)
// return true;
#endif
return false;
}
void DetectPowerpcFeatures()
{
// The CPU_ProbeXXX's return false for OSes which
// can't tolerate SIGILL-based probes, like Apple
g_hasAltivec = CPU_QueryAltivec() || CPU_ProbeAltivec();
g_hasPower7 = CPU_QueryPower7() || CPU_ProbePower7();
g_hasPower8 = CPU_QueryPower8() || CPU_ProbePower8();
//g_hasPMULL = CPU_QueryPMULL() || CPU_ProbePMULL();
g_hasAES = CPU_QueryAES() || CPU_ProbeAES();
g_hasSHA256 = CPU_QuerySHA256() || CPU_ProbeSHA256();
g_hasSHA512 = CPU_QuerySHA512() || CPU_ProbeSHA512();
#if defined(_AIX)
// /usr/include/sys/systemcfg.h
g_cacheLineSize = getsystemcfg(SC_L1C_DLS);
#elif defined(__linux__) && defined(_SC_LEVEL1_DCACHE_LINESIZE)
// GCC112 CentOS 7 returns 0?
g_cacheLineSize = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
#endif
if (g_cacheLineSize <= 0)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
*const_cast<volatile bool*>(&g_PowerpcDetectionDone) = true;
}
#endif
NAMESPACE_END
// *************************** C++ Static Initialization ***************************
ANONYMOUS_NAMESPACE_BEGIN
class InitCpu
{
public:
InitCpu()
{
#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
CryptoPP::DetectX86Features();
#elif CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64
CryptoPP::DetectArmFeatures();
#elif CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64
CryptoPP::DetectPowerpcFeatures();
#endif
}
};
// This is not really needed because HasSSE() and friends can dynamically initialize.
// Everything depends on CPU features so we initialize it once at load time.
// Dynamic initialization will be used if init priorities are not available.
#if HAVE_GCC_INIT_PRIORITY
const InitCpu s_init __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 10))) = InitCpu();
#elif HAVE_MSC_INIT_PRIORITY
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU")
const InitCpu s_init;
#pragma warning(default: 4075)
#else
const InitCpu s_init;
#endif
ANONYMOUS_NAMESPACE_END
#endif // CRYPTOPP_IMPORTS
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