2 * QTest testcase for the MC146818 real-time clock
4 * Copyright IBM, Corp. 2012
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
14 #include "hw/mc146818rtc_regs.h"
22 static uint8_t base = 0x70;
24 static int bcd2dec(int value)
26 return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
29 static int dec2bcd(int value)
31 return ((value / 10) << 4) | (value % 10);
34 static uint8_t cmos_read(uint8_t reg)
40 static void cmos_write(uint8_t reg, uint8_t val)
46 static int tm_cmp(struct tm *lhs, struct tm *rhs)
51 memcpy(&d1, lhs, sizeof(d1));
52 memcpy(&d2, rhs, sizeof(d2));
67 static void print_tm(struct tm *tm)
69 printf("%04d-%02d-%02d %02d:%02d:%02d\n",
70 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
71 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
75 static void cmos_get_date_time(struct tm *date)
77 int base_year = 2000, hour_offset;
78 int sec, min, hour, mday, mon, year;
82 sec = cmos_read(RTC_SECONDS);
83 min = cmos_read(RTC_MINUTES);
84 hour = cmos_read(RTC_HOURS);
85 mday = cmos_read(RTC_DAY_OF_MONTH);
86 mon = cmos_read(RTC_MONTH);
87 year = cmos_read(RTC_YEAR);
89 if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
101 if ((cmos_read(0x0B) & REG_B_24H) == 0) {
102 if (hour >= hour_offset) {
109 localtime_r(&ts, &dummy);
111 date->tm_isdst = dummy.tm_isdst;
114 date->tm_hour = hour;
115 date->tm_mday = mday;
116 date->tm_mon = mon - 1;
117 date->tm_year = base_year + year - 1900;
123 static void check_time(int wiggle)
125 struct tm start, date[4], end;
130 * This check assumes a few things. First, we cannot guarantee that we get
131 * a consistent reading from the wall clock because we may hit an edge of
132 * the clock while reading. To work around this, we read four clock readings
133 * such that at least two of them should match. We need to assume that one
134 * reading is corrupt so we need four readings to ensure that we have at
135 * least two consecutive identical readings
137 * It's also possible that we'll cross an edge reading the host clock so
138 * simply check to make sure that the clock reading is within the period of
139 * when we expect it to be.
143 gmtime_r(&ts, &start);
145 cmos_get_date_time(&date[0]);
146 cmos_get_date_time(&date[1]);
147 cmos_get_date_time(&date[2]);
148 cmos_get_date_time(&date[3]);
153 if (tm_cmp(&date[0], &date[1]) == 0) {
155 } else if (tm_cmp(&date[1], &date[2]) == 0) {
157 } else if (tm_cmp(&date[2], &date[3]) == 0) {
160 g_assert_not_reached();
163 if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
166 start.tm_isdst = datep->tm_isdst;
168 t = (long)mktime(datep);
169 s = (long)mktime(&start);
171 g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
173 g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
176 g_assert_cmpint(ABS(t - s), <=, wiggle);
180 static int wiggle = 2;
182 static void set_year(void)
185 cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_DM);
186 cmos_write(RTC_REG_A, 0x76);
187 cmos_write(RTC_YEAR, 0x11);
188 cmos_write(RTC_MONTH, 0x02);
189 cmos_write(RTC_DAY_OF_MONTH, 0x02);
190 cmos_write(RTC_HOURS, 0x02);
191 cmos_write(RTC_MINUTES, 0x04);
192 cmos_write(RTC_SECONDS, 0x58);
193 cmos_write(RTC_REG_A, 0x26);
195 g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
196 g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
197 g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
198 g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
199 g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
200 g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
202 /* Set a date in 2080 to ensure there is no year-2038 overflow. */
203 cmos_write(RTC_REG_A, 0x76);
204 cmos_write(RTC_YEAR, 0x80);
205 cmos_write(RTC_REG_A, 0x26);
207 g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
208 g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
209 g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
210 g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
211 g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
212 g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x80);
214 cmos_write(RTC_REG_A, 0x76);
215 cmos_write(RTC_YEAR, 0x11);
216 cmos_write(RTC_REG_A, 0x26);
218 g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
219 g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
220 g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
221 g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
222 g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
223 g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
226 static void bcd_check_time(void)
229 cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_DM);
233 static void dec_check_time(void)
236 cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
240 static void set_alarm_time(struct tm *tm)
246 if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
250 cmos_write(RTC_SECONDS_ALARM, sec);
251 cmos_write(RTC_MINUTES_ALARM, RTC_ALARM_DONT_CARE);
252 cmos_write(RTC_HOURS_ALARM, RTC_ALARM_DONT_CARE);
255 static void alarm_time(void)
265 cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
267 g_assert(!get_irq(RTC_ISA_IRQ));
268 cmos_read(RTC_REG_C);
270 now.tm_sec = (now.tm_sec + 2) % 60;
271 set_alarm_time(&now);
272 cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_AIE);
274 for (i = 0; i < 2 + wiggle; i++) {
275 if (get_irq(RTC_ISA_IRQ)) {
279 clock_step(1000000000);
282 g_assert(get_irq(RTC_ISA_IRQ));
283 g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
284 g_assert(cmos_read(RTC_REG_C) == 0);
287 /* success if no crash or abort */
288 static void fuzz_registers(void)
292 for (i = 0; i < 1000; i++) {
295 reg = (uint8_t)g_test_rand_int_range(0, 16);
296 val = (uint8_t)g_test_rand_int_range(0, 256);
298 cmos_write(reg, val);
303 int main(int argc, char **argv)
305 QTestState *s = NULL;
308 g_test_init(&argc, &argv, NULL);
310 s = qtest_start("-display none -rtc clock=vm");
311 qtest_irq_intercept_in(s, "ioapic");
313 qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
314 qtest_add_func("/rtc/dec/check-time", dec_check_time);
315 qtest_add_func("/rtc/alarm-time", alarm_time);
316 qtest_add_func("/rtc/set-year", set_year);
317 qtest_add_func("/rtc/fuzz-registers", fuzz_registers);