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