197 lines
6.2 KiB
C
Executable File
197 lines
6.2 KiB
C
Executable File
/* Some of the source code in this file came from "linux/fs/fat/misc.c". */
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/*
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* linux/fs/fat/misc.c
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*
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* Written 1992,1993 by Werner Almesberger
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* 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
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* and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
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*/
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/************************************************************************/
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/* */
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/* PROJECT : exFAT & FAT12/16/32 File System */
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/* FILE : exfat_oal.c */
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/* PURPOSE : exFAT OS Adaptation Layer */
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/* (Semaphore Functions & Real-Time Clock Functions) */
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/* */
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/*----------------------------------------------------------------------*/
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/* NOTES */
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/* */
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/*----------------------------------------------------------------------*/
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/* REVISION HISTORY (Ver 0.9) */
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/* */
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/* - 2010.11.15 [Joosun Hahn] : first writing */
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/* */
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/************************************************************************/
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#include <linux/semaphore.h>
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#include <linux/time.h>
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#include "exfat_config.h"
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#include "exfat_api.h"
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#include "exfat_oal.h"
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/*======================================================================*/
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/* */
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/* SEMAPHORE FUNCTIONS */
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/* */
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/*======================================================================*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
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DECLARE_MUTEX(z_sem);
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#else
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DEFINE_SEMAPHORE(z_sem);
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#endif
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s32 sm_init(struct semaphore *sm)
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{
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sema_init(sm, 1);
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return 0;
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} /* end of sm_init */
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s32 sm_P(struct semaphore *sm)
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{
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down(sm);
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return 0;
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} /* end of sm_P */
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void sm_V(struct semaphore *sm)
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{
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up(sm);
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} /* end of sm_V */
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/*======================================================================*/
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/* */
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/* REAL-TIME CLOCK FUNCTIONS */
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/* */
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/*======================================================================*/
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extern struct timezone sys_tz;
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/*
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* The epoch of FAT timestamp is 1980.
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* : bits : value
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* date: 0 - 4: day (1 - 31)
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* date: 5 - 8: month (1 - 12)
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* date: 9 - 15: year (0 - 127) from 1980
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* time: 0 - 4: sec (0 - 29) 2sec counts
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* time: 5 - 10: min (0 - 59)
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* time: 11 - 15: hour (0 - 23)
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*/
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#define UNIX_SECS_1980 315532800L
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#if BITS_PER_LONG == 64
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#define UNIX_SECS_2108 4354819200L
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#endif
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/* days between 1.1.70 and 1.1.80 (2 leap days) */
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#define DAYS_DELTA_DECADE (365 * 10 + 2)
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/* 120 (2100 - 1980) isn't leap year */
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#define NO_LEAP_YEAR_2100 (120)
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#define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != NO_LEAP_YEAR_2100)
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#define SECS_PER_MIN (60)
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#define SECS_PER_HOUR (60 * SECS_PER_MIN)
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#define SECS_PER_DAY (24 * SECS_PER_HOUR)
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#define MAKE_LEAP_YEAR(leap_year, year) \
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do { \
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if (unlikely(year > NO_LEAP_YEAR_2100)) \
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leap_year = ((year + 3) / 4) - 1; \
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else \
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leap_year = ((year + 3) / 4); \
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} while (0)
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/* Linear day numbers of the respective 1sts in non-leap years. */
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static time_t accum_days_in_year[] = {
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/* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
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0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
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};
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TIMESTAMP_T *tm_current(TIMESTAMP_T *tp)
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{
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struct timespec_compat ts;
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time_t second, day, leap_day, month, year;
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0)
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ts = CURRENT_TIME_SEC;
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#else
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KTIME_GET_REAL_TS(&ts);
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#endif
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second = ts.tv_sec;
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second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
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/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
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if (second < UNIX_SECS_1980) {
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tp->sec = 0;
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tp->min = 0;
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tp->hour = 0;
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tp->day = 1;
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tp->mon = 1;
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tp->year = 0;
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return tp;
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}
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#if BITS_PER_LONG == 64
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if (second >= UNIX_SECS_2108) {
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tp->sec = 59;
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tp->min = 59;
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tp->hour = 23;
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tp->day = 31;
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tp->mon = 12;
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tp->year = 127;
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return tp;
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}
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#endif
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day = second / SECS_PER_DAY - DAYS_DELTA_DECADE;
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year = day / 365;
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MAKE_LEAP_YEAR(leap_day, year);
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if (year * 365 + leap_day > day)
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year--;
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MAKE_LEAP_YEAR(leap_day, year);
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day -= year * 365 + leap_day;
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if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) {
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month = 2;
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} else {
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if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3])
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day--;
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for (month = 1; month < 12; month++) {
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if (accum_days_in_year[month + 1] > day)
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break;
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}
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}
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day -= accum_days_in_year[month];
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tp->sec = second % SECS_PER_MIN;
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tp->min = (second / SECS_PER_MIN) % 60;
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tp->hour = (second / SECS_PER_HOUR) % 24;
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tp->day = day + 1;
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tp->mon = month;
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tp->year = year;
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return tp;
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} /* end of tm_current */
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