tests/rtc-test.c

   1 /*
   2  * QTest testcase for the MC146818 real-time clock
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   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.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15
  16 #include "libqtest-single.h"
  17 #include "qemu/timer.h"
  18 #include "hw/rtc/mc146818rtc.h"
  19 #include "hw/rtc/mc146818rtc_regs.h"
  20
  21 #define UIP_HOLD_LENGTH           (8 * NANOSECONDS_PER_SECOND / 32768)
  22
  23 static uint8_t base = 0x70;
  24
  25 static int bcd2dec(int value)
  26 {
  27     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  28 }
  29
  30 static uint8_t cmos_read(uint8_t reg)
  31 {
  32     outb(base + 0, reg);
  33     return inb(base + 1);
  34 }
  35
  36 static void cmos_write(uint8_t reg, uint8_t val)
  37 {
  38     outb(base + 0, reg);
  39     outb(base + 1, val);
  40 }
  41
  42 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  43 {
  44     time_t a, b;
  45     struct tm d1, d2;
  46
  47     memcpy(&d1, lhs, sizeof(d1));
  48     memcpy(&d2, rhs, sizeof(d2));
  49
  50     a = mktime(&d1);
  51     b = mktime(&d2);
  52
  53     if (a < b) {
  54         return -1;
  55     } else if (a > b) {
  56         return 1;
  57     }
  58
  59     return 0;
  60 }
  61
  62 #if 0
  63 static void print_tm(struct tm *tm)
  64 {
  65     printf("%04d-%02d-%02d %02d:%02d:%02d\n",
  66            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
  67            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
  68 }
  69 #endif
  70
  71 static void cmos_get_date_time(struct tm *date)
  72 {
  73     int base_year = 2000, hour_offset;
  74     int sec, min, hour, mday, mon, year;
  75     time_t ts;
  76     struct tm dummy;
  77
  78     sec = cmos_read(RTC_SECONDS);
  79     min = cmos_read(RTC_MINUTES);
  80     hour = cmos_read(RTC_HOURS);
  81     mday = cmos_read(RTC_DAY_OF_MONTH);
  82     mon = cmos_read(RTC_MONTH);
  83     year = cmos_read(RTC_YEAR);
  84
  85     if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
  86         sec = bcd2dec(sec);
  87         min = bcd2dec(min);
  88         hour = bcd2dec(hour);
  89         mday = bcd2dec(mday);
  90         mon = bcd2dec(mon);
  91         year = bcd2dec(year);
  92         hour_offset = 80;
  93     } else {
  94         hour_offset = 0x80;
  95     }
  96
  97     if ((cmos_read(0x0B) & REG_B_24H) == 0) {
  98         if (hour >= hour_offset) {
  99             hour -= hour_offset;
 100             hour += 12;
 101         }
 102     }
 103
 104     ts = time(NULL);
 105     localtime_r(&ts, &dummy);
 106
 107     date->tm_isdst = dummy.tm_isdst;
 108     date->tm_sec = sec;
 109     date->tm_min = min;
 110     date->tm_hour = hour;
 111     date->tm_mday = mday;
 112     date->tm_mon = mon - 1;
 113     date->tm_year = base_year + year - 1900;
 114 #ifndef __sun__
 115     date->tm_gmtoff = 0;
 116 #endif
 117
 118     ts = mktime(date);
 119 }
 120
 121 static void check_time(int wiggle)
 122 {
 123     struct tm start, date[4], end;
 124     struct tm *datep;
 125     time_t ts;
 126
 127     /*
 128      * This check assumes a few things.  First, we cannot guarantee that we get
 129      * a consistent reading from the wall clock because we may hit an edge of
 130      * the clock while reading.  To work around this, we read four clock readings
 131      * such that at least two of them should match.  We need to assume that one
 132      * reading is corrupt so we need four readings to ensure that we have at
 133      * least two consecutive identical readings
 134      *
 135      * It's also possible that we'll cross an edge reading the host clock so
 136      * simply check to make sure that the clock reading is within the period of
 137      * when we expect it to be.
 138      */
 139
 140     ts = time(NULL);
 141     gmtime_r(&ts, &start);
 142
 143     cmos_get_date_time(&date[0]);
 144     cmos_get_date_time(&date[1]);
 145     cmos_get_date_time(&date[2]);
 146     cmos_get_date_time(&date[3]);
 147
 148     ts = time(NULL);
 149     gmtime_r(&ts, &end);
 150
 151     if (tm_cmp(&date[0], &date[1]) == 0) {
 152         datep = &date[0];
 153     } else if (tm_cmp(&date[1], &date[2]) == 0) {
 154         datep = &date[1];
 155     } else if (tm_cmp(&date[2], &date[3]) == 0) {
 156         datep = &date[2];
 157     } else {
 158         g_assert_not_reached();
 159     }
 160
 161     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
 162         long t, s;
 163
 164         start.tm_isdst = datep->tm_isdst;
 165
 166         t = (long)mktime(datep);
 167         s = (long)mktime(&start);
 168         if (t < s) {
 169             g_test_message("RTC is %ld second(s) behind wall-clock", (s - t));
 170         } else {
 171             g_test_message("RTC is %ld second(s) ahead of wall-clock", (t - s));
 172         }
 173
 174         g_assert_cmpint(ABS(t - s), <=, wiggle);
 175     }
 176 }
 177
 178 static int wiggle = 2;
 179
 180 static void set_year_20xx(void)
 181 {
 182     /* Set BCD mode */
 183     cmos_write(RTC_REG_B, REG_B_24H);
 184     cmos_write(RTC_REG_A, 0x76);
 185     cmos_write(RTC_YEAR, 0x11);
 186     cmos_write(RTC_CENTURY, 0x20);
 187     cmos_write(RTC_MONTH, 0x02);
 188     cmos_write(RTC_DAY_OF_MONTH, 0x02);
 189     cmos_write(RTC_HOURS, 0x02);
 190     cmos_write(RTC_MINUTES, 0x04);
 191     cmos_write(RTC_SECONDS, 0x58);
 192     cmos_write(RTC_REG_A, 0x26);
 193
 194     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 195     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 196     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 197     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 198     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 199     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 200     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 201
 202     if (sizeof(time_t) == 4) {
 203         return;
 204     }
 205
 206     /* Set a date in 2080 to ensure there is no year-2038 overflow.  */
 207     cmos_write(RTC_REG_A, 0x76);
 208     cmos_write(RTC_YEAR, 0x80);
 209     cmos_write(RTC_REG_A, 0x26);
 210
 211     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 212     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 213     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 214     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 215     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 216     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x80);
 217     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 218
 219     cmos_write(RTC_REG_A, 0x76);
 220     cmos_write(RTC_YEAR, 0x11);
 221     cmos_write(RTC_REG_A, 0x26);
 222
 223     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 224     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 225     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 226     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 227     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 228     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 229     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 230 }
 231
 232 static void set_year_1980(void)
 233 {
 234     /* Set BCD mode */
 235     cmos_write(RTC_REG_B, REG_B_24H);
 236     cmos_write(RTC_REG_A, 0x76);
 237     cmos_write(RTC_YEAR, 0x80);
 238     cmos_write(RTC_CENTURY, 0x19);
 239     cmos_write(RTC_MONTH, 0x02);
 240     cmos_write(RTC_DAY_OF_MONTH, 0x02);
 241     cmos_write(RTC_HOURS, 0x02);
 242     cmos_write(RTC_MINUTES, 0x04);
 243     cmos_write(RTC_SECONDS, 0x58);
 244     cmos_write(RTC_REG_A, 0x26);
 245
 246     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 247     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 248     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 249     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 250     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 251     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x80);
 252     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x19);
 253 }
 254
 255 static void bcd_check_time(void)
 256 {
 257     /* Set BCD mode */
 258     cmos_write(RTC_REG_B, REG_B_24H);
 259     check_time(wiggle);
 260 }
 261
 262 static void dec_check_time(void)
 263 {
 264     /* Set DEC mode */
 265     cmos_write(RTC_REG_B, REG_B_24H | REG_B_DM);
 266     check_time(wiggle);
 267 }
 268
 269 static void alarm_time(void)
 270 {
 271     struct tm now;
 272     time_t ts;
 273     int i;
 274
 275     ts = time(NULL);
 276     gmtime_r(&ts, &now);
 277
 278     /* set DEC mode */
 279     cmos_write(RTC_REG_B, REG_B_24H | REG_B_DM);
 280
 281     g_assert(!get_irq(RTC_ISA_IRQ));
 282     cmos_read(RTC_REG_C);
 283
 284     now.tm_sec = (now.tm_sec + 2) % 60;
 285     cmos_write(RTC_SECONDS_ALARM, now.tm_sec);
 286     cmos_write(RTC_MINUTES_ALARM, RTC_ALARM_DONT_CARE);
 287     cmos_write(RTC_HOURS_ALARM, RTC_ALARM_DONT_CARE);
 288     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_AIE);
 289
 290     for (i = 0; i < 2 + wiggle; i++) {
 291         if (get_irq(RTC_ISA_IRQ)) {
 292             break;
 293         }
 294
 295         clock_step(1000000000);
 296     }
 297
 298     g_assert(get_irq(RTC_ISA_IRQ));
 299     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 300     g_assert(cmos_read(RTC_REG_C) == 0);
 301 }
 302
 303 static void set_time_regs(int h, int m, int s)
 304 {
 305     cmos_write(RTC_HOURS, h);
 306     cmos_write(RTC_MINUTES, m);
 307     cmos_write(RTC_SECONDS, s);
 308 }
 309
 310 static void set_time(int mode, int h, int m, int s)
 311 {
 312     cmos_write(RTC_REG_B, mode);
 313     cmos_write(RTC_REG_A, 0x76);
 314     set_time_regs(h, m, s);
 315     cmos_write(RTC_REG_A, 0x26);
 316 }
 317
 318 static void set_datetime_bcd(int h, int min, int s, int d, int m, int y)
 319 {
 320     cmos_write(RTC_HOURS, h);
 321     cmos_write(RTC_MINUTES, min);
 322     cmos_write(RTC_SECONDS, s);
 323     cmos_write(RTC_YEAR, y & 0xFF);
 324     cmos_write(RTC_CENTURY, y >> 8);
 325     cmos_write(RTC_MONTH, m);
 326     cmos_write(RTC_DAY_OF_MONTH, d);
 327 }
 328
 329 static void set_datetime_dec(int h, int min, int s, int d, int m, int y)
 330 {
 331     cmos_write(RTC_HOURS, h);
 332     cmos_write(RTC_MINUTES, min);
 333     cmos_write(RTC_SECONDS, s);
 334     cmos_write(RTC_YEAR, y % 100);
 335     cmos_write(RTC_CENTURY, y / 100);
 336     cmos_write(RTC_MONTH, m);
 337     cmos_write(RTC_DAY_OF_MONTH, d);
 338 }
 339
 340 static void set_datetime(int mode, int h, int min, int s, int d, int m, int y)
 341 {
 342     cmos_write(RTC_REG_B, mode);
 343
 344     cmos_write(RTC_REG_A, 0x76);
 345     if (mode & REG_B_DM) {
 346         set_datetime_dec(h, min, s, d, m, y);
 347     } else {
 348         set_datetime_bcd(h, min, s, d, m, y);
 349     }
 350     cmos_write(RTC_REG_A, 0x26);
 351 }
 352
 353 #define assert_time(h, m, s) \
 354     do { \
 355         g_assert_cmpint(cmos_read(RTC_HOURS), ==, h); \
 356         g_assert_cmpint(cmos_read(RTC_MINUTES), ==, m); \
 357         g_assert_cmpint(cmos_read(RTC_SECONDS), ==, s); \
 358     } while(0)
 359
 360 #define assert_datetime_bcd(h, min, s, d, m, y) \
 361     do { \
 362         g_assert_cmpint(cmos_read(RTC_HOURS), ==, h); \
 363         g_assert_cmpint(cmos_read(RTC_MINUTES), ==, min); \
 364         g_assert_cmpint(cmos_read(RTC_SECONDS), ==, s); \
 365         g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, d); \
 366         g_assert_cmpint(cmos_read(RTC_MONTH), ==, m); \
 367         g_assert_cmpint(cmos_read(RTC_YEAR), ==, (y & 0xFF)); \
 368         g_assert_cmpint(cmos_read(RTC_CENTURY), ==, (y >> 8)); \
 369     } while(0)
 370
 371 static void basic_12h_bcd(void)
 372 {
 373     /* set BCD 12 hour mode */
 374     set_time(0, 0x81, 0x59, 0x00);
 375     clock_step(1000000000LL);
 376     assert_time(0x81, 0x59, 0x01);
 377     clock_step(59000000000LL);
 378     assert_time(0x82, 0x00, 0x00);
 379
 380     /* test BCD wraparound */
 381     set_time(0, 0x09, 0x59, 0x59);
 382     clock_step(60000000000LL);
 383     assert_time(0x10, 0x00, 0x59);
 384
 385     /* 12 AM -> 1 AM */
 386     set_time(0, 0x12, 0x59, 0x59);
 387     clock_step(1000000000LL);
 388     assert_time(0x01, 0x00, 0x00);
 389
 390     /* 12 PM -> 1 PM */
 391     set_time(0, 0x92, 0x59, 0x59);
 392     clock_step(1000000000LL);
 393     assert_time(0x81, 0x00, 0x00);
 394
 395     /* 11 AM -> 12 PM */
 396     set_time(0, 0x11, 0x59, 0x59);
 397     clock_step(1000000000LL);
 398     assert_time(0x92, 0x00, 0x00);
 399     /* TODO: test day wraparound */
 400
 401     /* 11 PM -> 12 AM */
 402     set_time(0, 0x91, 0x59, 0x59);
 403     clock_step(1000000000LL);
 404     assert_time(0x12, 0x00, 0x00);
 405     /* TODO: test day wraparound */
 406 }
 407
 408 static void basic_12h_dec(void)
 409 {
 410     /* set decimal 12 hour mode */
 411     set_time(REG_B_DM, 0x81, 59, 0);
 412     clock_step(1000000000LL);
 413     assert_time(0x81, 59, 1);
 414     clock_step(59000000000LL);
 415     assert_time(0x82, 0, 0);
 416
 417     /* 12 PM -> 1 PM */
 418     set_time(REG_B_DM, 0x8c, 59, 59);
 419     clock_step(1000000000LL);
 420     assert_time(0x81, 0, 0);
 421
 422     /* 12 AM -> 1 AM */
 423     set_time(REG_B_DM, 0x0c, 59, 59);
 424     clock_step(1000000000LL);
 425     assert_time(0x01, 0, 0);
 426
 427     /* 11 AM -> 12 PM */
 428     set_time(REG_B_DM, 0x0b, 59, 59);
 429     clock_step(1000000000LL);
 430     assert_time(0x8c, 0, 0);
 431
 432     /* 11 PM -> 12 AM */
 433     set_time(REG_B_DM, 0x8b, 59, 59);
 434     clock_step(1000000000LL);
 435     assert_time(0x0c, 0, 0);
 436     /* TODO: test day wraparound */
 437 }
 438
 439 static void basic_24h_bcd(void)
 440 {
 441     /* set BCD 24 hour mode */
 442     set_time(REG_B_24H, 0x09, 0x59, 0x00);
 443     clock_step(1000000000LL);
 444     assert_time(0x09, 0x59, 0x01);
 445     clock_step(59000000000LL);
 446     assert_time(0x10, 0x00, 0x00);
 447
 448     /* test BCD wraparound */
 449     set_time(REG_B_24H, 0x09, 0x59, 0x00);
 450     clock_step(60000000000LL);
 451     assert_time(0x10, 0x00, 0x00);
 452
 453     /* TODO: test day wraparound */
 454     set_time(REG_B_24H, 0x23, 0x59, 0x00);
 455     clock_step(60000000000LL);
 456     assert_time(0x00, 0x00, 0x00);
 457 }
 458
 459 static void basic_24h_dec(void)
 460 {
 461     /* set decimal 24 hour mode */
 462     set_time(REG_B_24H | REG_B_DM, 9, 59, 0);
 463     clock_step(1000000000LL);
 464     assert_time(9, 59, 1);
 465     clock_step(59000000000LL);
 466     assert_time(10, 0, 0);
 467
 468     /* test BCD wraparound */
 469     set_time(REG_B_24H | REG_B_DM, 9, 59, 0);
 470     clock_step(60000000000LL);
 471     assert_time(10, 0, 0);
 472
 473     /* TODO: test day wraparound */
 474     set_time(REG_B_24H | REG_B_DM, 23, 59, 0);
 475     clock_step(60000000000LL);
 476     assert_time(0, 0, 0);
 477 }
 478
 479 static void am_pm_alarm(void)
 480 {
 481     cmos_write(RTC_MINUTES_ALARM, 0xC0);
 482     cmos_write(RTC_SECONDS_ALARM, 0xC0);
 483
 484     /* set BCD 12 hour mode */
 485     cmos_write(RTC_REG_B, 0);
 486
 487     /* Set time and alarm hour.  */
 488     cmos_write(RTC_REG_A, 0x76);
 489     cmos_write(RTC_HOURS_ALARM, 0x82);
 490     cmos_write(RTC_HOURS, 0x81);
 491     cmos_write(RTC_MINUTES, 0x59);
 492     cmos_write(RTC_SECONDS, 0x00);
 493     cmos_read(RTC_REG_C);
 494     cmos_write(RTC_REG_A, 0x26);
 495
 496     /* Check that alarm triggers when AM/PM is set.  */
 497     clock_step(60000000000LL);
 498     g_assert(cmos_read(RTC_HOURS) == 0x82);
 499     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 500
 501     /*
 502      * Each of the following two tests takes over 60 seconds due to the time
 503      * needed to report the PIT interrupts.  Unfortunately, our PIT device
 504      * model keeps counting even when GATE=0, so we cannot simply disable
 505      * it in main().
 506      */
 507     if (g_test_quick()) {
 508         return;
 509     }
 510
 511     /* set DEC 12 hour mode */
 512     cmos_write(RTC_REG_B, REG_B_DM);
 513
 514     /* Set time and alarm hour.  */
 515     cmos_write(RTC_REG_A, 0x76);
 516     cmos_write(RTC_HOURS_ALARM, 0x82);
 517     cmos_write(RTC_HOURS, 3);
 518     cmos_write(RTC_MINUTES, 0);
 519     cmos_write(RTC_SECONDS, 0);
 520     cmos_read(RTC_REG_C);
 521     cmos_write(RTC_REG_A, 0x26);
 522
 523     /* Check that alarm triggers.  */
 524     clock_step(3600 * 11 * 1000000000LL);
 525     g_assert(cmos_read(RTC_HOURS) == 0x82);
 526     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 527
 528     /* Same as above, with inverted HOURS and HOURS_ALARM.  */
 529     cmos_write(RTC_REG_A, 0x76);
 530     cmos_write(RTC_HOURS_ALARM, 2);
 531     cmos_write(RTC_HOURS, 3);
 532     cmos_write(RTC_MINUTES, 0);
 533     cmos_write(RTC_SECONDS, 0);
 534     cmos_read(RTC_REG_C);
 535     cmos_write(RTC_REG_A, 0x26);
 536
 537     /* Check that alarm does not trigger if hours differ only by AM/PM.  */
 538     clock_step(3600 * 11 * 1000000000LL);
 539     g_assert(cmos_read(RTC_HOURS) == 0x82);
 540     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) == 0);
 541 }
 542
 543 /* success if no crash or abort */
 544 static void fuzz_registers(void)
 545 {
 546     unsigned int i;
 547
 548     for (i = 0; i < 1000; i++) {
 549         uint8_t reg, val;
 550
 551         reg = (uint8_t)g_test_rand_int_range(0, 16);
 552         val = (uint8_t)g_test_rand_int_range(0, 256);
 553
 554         cmos_write(reg, val);
 555         cmos_read(reg);
 556     }
 557 }
 558
 559 static void register_b_set_flag(void)
 560 {
 561     if (cmos_read(RTC_REG_A) & REG_A_UIP) {
 562         clock_step(UIP_HOLD_LENGTH + NANOSECONDS_PER_SECOND / 5);
 563     }
 564     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, ==, 0);
 565
 566     /* Enable binary-coded decimal (BCD) mode and SET flag in Register B*/
 567     cmos_write(RTC_REG_B, REG_B_24H | REG_B_SET);
 568
 569     set_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 570
 571     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 572
 573     /* Since SET flag is still enabled, time does not advance. */
 574     clock_step(1000000000LL);
 575     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 576
 577     /* Disable SET flag in Register B */
 578     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_SET);
 579
 580     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 581
 582     /* Since SET flag is disabled, the clock now advances.  */
 583     clock_step(1000000000LL);
 584     assert_datetime_bcd(0x02, 0x04, 0x59, 0x02, 0x02, 0x2011);
 585 }
 586
 587 static void divider_reset(void)
 588 {
 589     /* Enable binary-coded decimal (BCD) mode in Register B*/
 590     cmos_write(RTC_REG_B, REG_B_24H);
 591
 592     /* Enter divider reset */
 593     cmos_write(RTC_REG_A, 0x76);
 594     set_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 595
 596     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 597
 598     /* Since divider reset flag is still enabled, these are equality checks. */
 599     clock_step(1000000000LL);
 600     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 601
 602     /* The first update ends 500 ms after divider reset */
 603     cmos_write(RTC_REG_A, 0x26);
 604     clock_step(500000000LL - UIP_HOLD_LENGTH - 1);
 605     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, ==, 0);
 606     assert_datetime_bcd(0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 607
 608     clock_step(1);
 609     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, !=, 0);
 610     clock_step(UIP_HOLD_LENGTH);
 611     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, ==, 0);
 612
 613     assert_datetime_bcd(0x02, 0x04, 0x59, 0x02, 0x02, 0x2011);
 614 }
 615
 616 static void uip_stuck(void)
 617 {
 618     set_datetime(REG_B_24H, 0x02, 0x04, 0x58, 0x02, 0x02, 0x2011);
 619
 620     /* The first update ends 500 ms after divider reset */
 621     (void)cmos_read(RTC_REG_C);
 622     clock_step(500000000LL);
 623     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, ==, 0);
 624     assert_datetime_bcd(0x02, 0x04, 0x59, 0x02, 0x02, 0x2011);
 625
 626     /* UF is now set.  */
 627     cmos_write(RTC_HOURS_ALARM, 0x02);
 628     cmos_write(RTC_MINUTES_ALARM, 0xC0);
 629     cmos_write(RTC_SECONDS_ALARM, 0xC0);
 630
 631     /* Because the alarm will fire soon, reading register A will latch UIP.  */
 632     clock_step(1000000000LL - UIP_HOLD_LENGTH / 2);
 633     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, !=, 0);
 634
 635     /* Move the alarm far away.  This must not cause UIP to remain stuck!  */
 636     cmos_write(RTC_HOURS_ALARM, 0x03);
 637     clock_step(UIP_HOLD_LENGTH);
 638     g_assert_cmpint(cmos_read(RTC_REG_A) & REG_A_UIP, ==, 0);
 639 }
 640
 641 #define RTC_PERIOD_CODE1    13   /* 8 Hz */
 642 #define RTC_PERIOD_CODE2    15   /* 2 Hz */
 643
 644 #define RTC_PERIOD_TEST_NR  50
 645
 646 static uint64_t wait_periodic_interrupt(uint64_t real_time)
 647 {
 648     while (!get_irq(RTC_ISA_IRQ)) {
 649         real_time = clock_step_next();
 650     }
 651
 652     g_assert((cmos_read(RTC_REG_C) & REG_C_PF) != 0);
 653     return real_time;
 654 }
 655
 656 static void periodic_timer(void)
 657 {
 658     int i;
 659     uint64_t period_clocks, period_time, start_time, real_time;
 660
 661     /* disable all interrupts. */
 662     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) &
 663                                    ~(REG_B_PIE | REG_B_AIE | REG_B_UIE));
 664     cmos_write(RTC_REG_A, RTC_PERIOD_CODE1);
 665     /* enable periodic interrupt after properly configure the period. */
 666     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_PIE);
 667
 668     start_time = real_time = clock_step_next();
 669
 670     for (i = 0; i < RTC_PERIOD_TEST_NR; i++) {
 671         cmos_write(RTC_REG_A, RTC_PERIOD_CODE1);
 672         real_time = wait_periodic_interrupt(real_time);
 673         cmos_write(RTC_REG_A, RTC_PERIOD_CODE2);
 674         real_time = wait_periodic_interrupt(real_time);
 675     }
 676
 677     period_clocks = periodic_period_to_clock(RTC_PERIOD_CODE1) +
 678                        periodic_period_to_clock(RTC_PERIOD_CODE2);
 679     period_clocks *= RTC_PERIOD_TEST_NR;
 680     period_time = periodic_clock_to_ns(period_clocks);
 681
 682     real_time -= start_time;
 683     g_assert_cmpint(ABS((int64_t)(real_time - period_time)), <=,
 684                     NANOSECONDS_PER_SECOND * 0.5);
 685 }
 686
 687 int main(int argc, char **argv)
 688 {
 689     QTestState *s = NULL;
 690     int ret;
 691
 692     g_test_init(&argc, &argv, NULL);
 693
 694     s = qtest_start("-rtc clock=vm");
 695     qtest_irq_intercept_in(s, "ioapic");
 696
 697     qtest_add_func("/rtc/check-time/bcd", bcd_check_time);
 698     qtest_add_func("/rtc/check-time/dec", dec_check_time);
 699     qtest_add_func("/rtc/alarm/interrupt", alarm_time);
 700     qtest_add_func("/rtc/alarm/am-pm", am_pm_alarm);
 701     qtest_add_func("/rtc/basic/dec-24h", basic_24h_dec);
 702     qtest_add_func("/rtc/basic/bcd-24h", basic_24h_bcd);
 703     qtest_add_func("/rtc/basic/dec-12h", basic_12h_dec);
 704     qtest_add_func("/rtc/basic/bcd-12h", basic_12h_bcd);
 705     qtest_add_func("/rtc/set-year/20xx", set_year_20xx);
 706     qtest_add_func("/rtc/set-year/1980", set_year_1980);
 707     qtest_add_func("/rtc/update/register_b_set_flag", register_b_set_flag);
 708     qtest_add_func("/rtc/update/divider-reset", divider_reset);
 709     qtest_add_func("/rtc/update/uip-stuck", uip_stuck);
 710     qtest_add_func("/rtc/misc/fuzz-registers", fuzz_registers);
 711     qtest_add_func("/rtc/periodic/interrupt", periodic_timer);
 712
 713     ret = g_test_run();
 714
 715     if (s) {
 716         qtest_quit(s);
 717     }
 718
 719     return ret;
 720 }