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/* Copyright 2013-2014 IBM 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.
*/
#include <time-utils.h>
/* MSB is byte 3, LSB is byte 0 */
static unsigned int bcd_byte(uint32_t bcd, int byteno)
{
bcd >>= byteno * 8;
return (bcd >> 4 & 0xf) * 10 + (bcd & 0xf);
}
static uint32_t int_to_bcd2(unsigned int x)
{
return (((x / 10) << 4) & 0xf0) | (x % 10);
}
static uint32_t int_to_bcd4(unsigned int x)
{
return int_to_bcd2(x / 100) << 8 | int_to_bcd2(x % 100);
}
/*
* Converts an OPAL formated datetime into a struct tm. We ignore microseconds
* as Linux doesn't use them anyway.
*
* | year | month | mday |
* +------------------------------------+
* | hour | minute | secs | reserved |
* +------------------------------------+
* | microseconds |
*/
void datetime_to_tm(uint32_t y_m_d, uint64_t h_m_s_m, struct tm *tm)
{
uint32_t x;
tm->tm_year = bcd_byte(y_m_d, 3) * 100 + bcd_byte(y_m_d, 2);
tm->tm_mon = bcd_byte(y_m_d, 1) - 1;
tm->tm_mday = bcd_byte(y_m_d, 0);
x = h_m_s_m >> 32;
tm->tm_hour = bcd_byte(x, 3);
tm->tm_min = bcd_byte(x, 2);
tm->tm_sec = bcd_byte(x, 1);
}
/*
* The OPAL API is defined as returned a u64 of a similar
* format to the FSP message; the 32-bit date field is
* in the format:
*
* | year | month | mday |
*
* ... and the 64-bit time field is in the format
*
* | hour | minutes | secs | millisec |
* | -------------------------------------
* | millisec | reserved |
*
* We simply ignore the microseconds/milliseconds for now
* as I don't quite understand why the OPAL API defines that
* it needs 6 digits for the milliseconds :-) I suspect the
* doc got that wrong and it's supposed to be micro but
* let's ignore it.
*
* Note that Linux doesn't use nor set the ms field anyway.
*/
void tm_to_datetime(struct tm *tm, uint32_t *y_m_d, uint64_t *h_m_s_m)
{
uint64_t h_m_s;
*y_m_d = int_to_bcd4(tm->tm_year) << 16 |
int_to_bcd2(tm->tm_mon + 1) << 8 |
int_to_bcd2(tm->tm_mday);
h_m_s = int_to_bcd2(tm->tm_hour) << 24 |
int_to_bcd2(tm->tm_min) << 16 |
int_to_bcd2(tm->tm_sec) << 8;
*h_m_s_m = h_m_s << 32;
}
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