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/*
* High Resolution Timestamp Entropy Source
* (C) 1999-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/hres_timer.h>
#include <botan/cpuid.h>
#include <botan/time.h>
#if defined(BOTAN_TARGET_OS_IS_WINDOWS)
#include <windows.h>
#endif
namespace Botan {
/*
* Get the timestamp
*/
void High_Resolution_Timestamp::poll(Entropy_Accumulator& accum)
{
// If Windows, grab the Performance Counter (usually TSC or PIT)
#if defined(BOTAN_TARGET_OS_IS_WINDOWS)
LARGE_INTEGER tv;
::QueryPerformanceCounter(&tv);
accum.add(tv.QuadPart, 0);
#endif
#if BOTAN_USE_GCC_INLINE_ASM
u64bit rtc = 0;
#if defined(BOTAN_TARGET_CPU_IS_X86_FAMILY)
if(CPUID::has_rdtsc()) // not availble on all x86 CPUs
{
u32bit rtc_low = 0, rtc_high = 0;
asm volatile("rdtsc" : "=d" (rtc_high), "=a" (rtc_low));
rtc = (static_cast<u64bit>(rtc_high) << 32) | rtc_low;
}
#elif defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY)
u32bit rtc_low = 0, rtc_high = 0;
asm volatile("mftbu %0; mftb %1" : "=r" (rtc_high), "=r" (rtc_low));
rtc = (static_cast<u64bit>(rtc_high) << 32) | rtc_low;
#elif defined(BOTAN_TARGET_ARCH_IS_ALPHA)
asm volatile("rpcc %0" : "=r" (rtc));
#elif defined(BOTAN_TARGET_ARCH_IS_SPARC64)
asm volatile("rd %%tick, %0" : "=r" (rtc));
#elif defined(BOTAN_TARGET_ARCH_IS_IA64)
asm volatile("mov %0=ar.itc" : "=r" (rtc));
#elif defined(BOTAN_TARGET_ARCH_IS_S390X)
asm volatile("stck 0(%0)" : : "a" (&rtc) : "memory", "cc");
#elif defined(BOTAN_TARGET_ARCH_IS_HPPA)
asm volatile("mfctl 16,%0" : "=r" (rtc)); // 64-bit only?
#endif
// Don't count the timestamp as contributing entropy
accum.add(rtc, 0);
#endif
}
}
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