diff options
Diffstat (limited to 'src/lib/ppc405lib/time.c')
| -rw-r--r-- | src/lib/ppc405lib/time.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/lib/ppc405lib/time.c b/src/lib/ppc405lib/time.c new file mode 100644 index 0000000..39d005c --- /dev/null +++ b/src/lib/ppc405lib/time.c @@ -0,0 +1,82 @@ +/* IBM_PROLOG_BEGIN_TAG */ +/* This is an automatically generated prolog. */ +/* */ +/* $Source: src/lib/ppc405lib/time.c $ */ +/* */ +/* OpenPOWER OnChipController Project */ +/* */ +/* Contributors Listed Below - COPYRIGHT 2015 */ +/* [+] International Business Machines Corp. */ +/* */ +/* */ +/* Licensed under the Apache License, Version 2.0 (the "License"); */ +/* you may not use this file except in compliance with the License. */ +/* You may obtain a copy of the License at */ +/* */ +/* http://www.apache.org/licenses/LICENSE-2.0 */ +/* */ +/* Unless required by applicable law or agreed to in writing, software */ +/* distributed under the License is distributed on an "AS IS" BASIS, */ +/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */ +/* implied. See the License for the specific language governing */ +/* permissions and limitations under the License. */ +/* */ +/* IBM_PROLOG_END_TAG */ +// $Id: time.c,v 1.1.1.1 2013/12/11 20:49:20 bcbrock Exp $ +// $Source: /afs/awd/projects/eclipz/KnowledgeBase/.cvsroot/eclipz/chips/p8/working/procedures/lib/time.c,v $ +//----------------------------------------------------------------------------- +// *! (C) Copyright International Business Machines Corp. 2013 +// *! All Rights Reserved -- Property of IBM +// *! *** IBM Confidential *** +//----------------------------------------------------------------------------- + +/// \file time.c +/// \brief Implementation of functions from <time.h> +/// +/// The following standard APIs are currently supported: +/// +/// - clock_gettime() with the single clock id CLOCK_REALTIME +/// +/// Since SSX does not currently have any per-thread CPU time statistics, we +/// can not implement process-CPU-time-based APIs like the simple clock() or +/// clock_gettime() with CLOCK_REALTIME. + +#include "ssx.h" +#include <errno.h> +#include <time.h> + +/// Get time from a timer +/// +/// \param clock_id This must be the constant CLOCK_REALTIME defined in +/// <time.h>. +/// +/// \param tp A pointer to a struct timespec populated by this API. +/// +/// Although the Posix standard requires that clock_gettime() support +/// CLOCK_REALTIME, CLOCK_REALTIME measures standard Unix time (seconds since +/// the epoch) which is not available to SSX. SSX currently only supports +/// CLOCK_MONOTONIC, which is derived from the SSX timebase. +/// +/// \returns Either 0 for success, or -EINVAL in the event of an invalid +/// argument (unrecognized \a clock_id, NULL \a tp pointer). + +int +clock_gettime(clockid_t clock_id, struct timespec* tp) +{ + int rc; + SsxTimebase now; + + if ((clock_id != CLOCK_MONOTONIC) || (tp == 0)) { + rc = -EINVAL; + } else { + + now = ssx_timebase_get(); + tp->tv_sec = now / SSX_TIMEBASE_FREQUENCY_HZ; + tp->tv_nsec = + ((now % SSX_TIMEBASE_FREQUENCY_HZ) * 1000000000) / + SSX_TIMEBASE_FREQUENCY_HZ; + rc = 0; + } + + return rc; +} |
