cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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time_test.c (2069B)

      1// SPDX-License-Identifier: LGPL-2.1+
      2
      3#include <kunit/test.h>
      4#include <linux/time.h>
      5
      6/*
      7 * Traditional implementation of leap year evaluation.
      8 */
      9static bool is_leap(long year)
     10{
     11	return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
     12}
     13
     14/*
     15 * Gets the last day of a month.
     16 */
     17static int last_day_of_month(long year, int month)
     18{
     19	if (month == 2)
     20		return 28 + is_leap(year);
     21	if (month == 4 || month == 6 || month == 9 || month == 11)
     22		return 30;
     23	return 31;
     24}
     25
     26/*
     27 * Advances a date by one day.
     28 */
     29static void advance_date(long *year, int *month, int *mday, int *yday)
     30{
     31	if (*mday != last_day_of_month(*year, *month)) {
     32		++*mday;
     33		++*yday;
     34		return;
     35	}
     36
     37	*mday = 1;
     38	if (*month != 12) {
     39		++*month;
     40		++*yday;
     41		return;
     42	}
     43
     44	*month = 1;
     45	*yday  = 0;
     46	++*year;
     47}
     48
     49/*
     50 * Checks every day in a 160000 years interval centered at 1970-01-01
     51 * against the expected result.
     52 */
     53static void time64_to_tm_test_date_range(struct kunit *test)
     54{
     55	/*
     56	 * 80000 years	= (80000 / 400) * 400 years
     57	 *		= (80000 / 400) * 146097 days
     58	 *		= (80000 / 400) * 146097 * 86400 seconds
     59	 */
     60	time64_t total_secs = ((time64_t) 80000) / 400 * 146097 * 86400;
     61	long year = 1970 - 80000;
     62	int month = 1;
     63	int mdday = 1;
     64	int yday = 0;
     65
     66	struct tm result;
     67	time64_t secs;
     68	s64 days;
     69
     70	for (secs = -total_secs; secs <= total_secs; secs += 86400) {
     71
     72		time64_to_tm(secs, 0, &result);
     73
     74		days = div_s64(secs, 86400);
     75
     76		#define FAIL_MSG "%05ld/%02d/%02d (%2d) : %ld", \
     77			year, month, mdday, yday, days
     78
     79		KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);
     80		KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);
     81		KUNIT_ASSERT_EQ_MSG(test, mdday, result.tm_mday, FAIL_MSG);
     82		KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
     83
     84		advance_date(&year, &month, &mdday, &yday);
     85	}
     86}
     87
     88static struct kunit_case time_test_cases[] = {
     89	KUNIT_CASE(time64_to_tm_test_date_range),
     90	{}
     91};
     92
     93static struct kunit_suite time_test_suite = {
     94	.name = "time_test_cases",
     95	.test_cases = time_test_cases,
     96};
     97
     98kunit_test_suite(time_test_suite);
     99MODULE_LICENSE("GPL");