diff options
Diffstat (limited to 'src/lib/utils/cpuid.cpp')
| -rw-r--r-- | src/lib/utils/cpuid.cpp | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/src/lib/utils/cpuid.cpp b/src/lib/utils/cpuid.cpp index 7b7b27f7c..9dd2297e4 100644 --- a/src/lib/utils/cpuid.cpp +++ b/src/lib/utils/cpuid.cpp @@ -73,9 +73,10 @@ namespace Botan { -u64bit CPUID::m_x86_processor_flags[2] = { 0, 0 }; -size_t CPUID::m_cache_line_size = 0; -bool CPUID::m_altivec_capable = false; +u64bit CPUID::g_x86_processor_flags[2] = { 0, 0 }; +size_t CPUID::g_cache_line_size = 0; +bool CPUID::g_altivec_capable = false; +bool CPUID::g_initialized = false; namespace { @@ -183,9 +184,12 @@ void CPUID::print(std::ostream& o) void CPUID::initialize() { + if(g_initialized) + return; + #if defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY) if(altivec_check_sysctl() || altivec_check_pvr_emul()) - m_altivec_capable = true; + g_altivec_capable = true; #endif #if defined(BOTAN_TARGET_CPU_IS_X86_FAMILY) @@ -205,22 +209,22 @@ void CPUID::initialize() X86_CPUID(1, cpuid); - m_x86_processor_flags[0] = (static_cast<u64bit>(cpuid[2]) << 32) | cpuid[3]; + g_x86_processor_flags[0] = (static_cast<u64bit>(cpuid[2]) << 32) | cpuid[3]; if(is_intel) - m_cache_line_size = 8 * get_byte(2, cpuid[1]); + g_cache_line_size = 8 * get_byte(2, cpuid[1]); if(max_supported_sublevel >= 7) { clear_mem(cpuid, 4); X86_CPUID_SUBLEVEL(7, 0, cpuid); - m_x86_processor_flags[1] = (static_cast<u64bit>(cpuid[2]) << 32) | cpuid[1]; + g_x86_processor_flags[1] = (static_cast<u64bit>(cpuid[2]) << 32) | cpuid[1]; } if(is_amd) { X86_CPUID(0x80000005, cpuid); - m_cache_line_size = get_byte(3, cpuid[2]); + g_cache_line_size = get_byte(3, cpuid[2]); } #endif @@ -230,9 +234,11 @@ void CPUID::initialize() * If we don't have access to CPUID, we can still safely assume that * any x86-64 processor has SSE2 and RDTSC */ - if(m_x86_processor_flags[0] == 0) - m_x86_processor_flags[0] = (1 << CPUID_SSE2_BIT) | (1 << CPUID_RDTSC_BIT); + if(g_x86_processor_flags[0] == 0) + g_x86_processor_flags[0] = (1 << CPUID_SSE2_BIT) | (1 << CPUID_RDTSC_BIT); #endif + + g_initialized = true; } } |