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/* $Id$ */
/*
* Copyright (C)2003-2006 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pj/os.h>
#include <pj/errno.h>
#include <windows.h>
#if defined(PJ_TIMESTAMP_USE_RDTSC) && PJ_TIMESTAMP_USE_RDTSC!=0 && \
defined(PJ_M_I386) && PJ_M_I386 != 0 && \
defined(_MSC_VER)
/*
* Use rdtsc to get the OS timestamp.
*/
static LONG CpuMhz;
static pj_int64_t CpuHz;
static pj_status_t GetCpuHz(void)
{
HKEY key;
LONG rc;
DWORD size;
rc = RegOpenKey( HKEY_LOCAL_MACHINE,
"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0",
&key);
if (rc != ERROR_SUCCESS)
return PJ_RETURN_OS_ERROR(rc);
size = sizeof(CpuMhz);
rc = RegQueryValueEx(key, "~MHz", NULL, NULL, (BYTE*)&CpuMhz, &size);
RegCloseKey(key);
if (rc != ERROR_SUCCESS) {
return PJ_RETURN_OS_ERROR(rc);
}
CpuHz = CpuMhz;
CpuHz = CpuHz * 1000000;
return PJ_SUCCESS;
}
/* __int64 is nicely returned in EDX:EAX */
__declspec(naked) __int64 rdtsc()
{
__asm
{
RDTSC
RET
}
}
PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts)
{
ts->u64 = rdtsc();
return PJ_SUCCESS;
}
PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq)
{
pj_status_t status;
if (CpuHz == 0) {
status = GetCpuHz();
if (status != PJ_SUCCESS)
return status;
}
freq->u64 = CpuHz;
return PJ_SUCCESS;
}
#else
/*
* Use QueryPerformanceCounter and QueryPerformanceFrequency.
*/
PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts)
{
LARGE_INTEGER val;
if (!QueryPerformanceCounter(&val))
return PJ_RETURN_OS_ERROR(GetLastError());
ts->u64 = val.QuadPart;
return PJ_SUCCESS;
}
PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq)
{
LARGE_INTEGER val;
if (!QueryPerformanceFrequency(&val))
return PJ_RETURN_OS_ERROR(GetLastError());
freq->u64 = val.QuadPart;
return PJ_SUCCESS;
}
#endif /* PJ_TIMESTAMP_USE_RDTSC */
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