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/******************************************************************************
* Copyright (c) 2004, 2008 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#include <stdint.h>
#include "kernel.h"
//*******************************************************************
// variable "tb_freq" contains the frequency in Hz
// and is read from the device tree (setup by LLFW) in "init.c"
uint64_t tb_freq;
//-------------------------------------------------------------------
// Read the current timebase
uint64_t get_time(void)
{
uint64_t act;
__asm__ __volatile__(
"0: mftbu %0 ;\
mftbl %%r0 ; \
mftbu %%r4 ; \
cmpw %0,%%r4 ; \
bne 0b; \
sldi %0,%0,32; \
or %0,%0,%%r0"
: "=r"(act)
: /* no inputs */
: "r0", "r4");
return act;
}
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