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/*
* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <kernel/misc.h>
#include <kernel/tee_time.h>
#include <trace.h>
#include <kernel/time_source.h>
#include <mm/core_mmu.h>
#include <utee_defines.h>
#include <assert.h>
#include <stdint.h>
#include <mpa.h>
#include <arm32.h>
static uint32_t do_div(uint64_t *dividend, uint32_t divisor)
{
mpa_word_t remainder = 0, n0, n1;
n0 = (*dividend) & UINT_MAX;
n1 = ((*dividend) >> WORD_SIZE) & UINT_MAX;
*dividend = __mpa_div_dword(n0, n1, divisor, &remainder);
return remainder;
}
static TEE_Result arm_cntpct_get_sys_time(TEE_Time *time)
{
uint64_t cntpct = read_cntpct();
uint32_t cntfrq = read_cntfrq();
uint32_t remainder;
remainder = do_div(&cntpct, cntfrq);
time->seconds = (uint32_t)cntpct;
time->millis = remainder / (cntfrq / TEE_TIME_MILLIS_BASE);
return TEE_SUCCESS;
}
static const struct time_source arm_cntpct_time_source = {
.name = "arm cntpct",
.get_sys_time = arm_cntpct_get_sys_time,
};
REGISTER_TIME_SOURCE(arm_cntpct_time_source)
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