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.h"
  17 #include "hw/timer/mc146818rtc_regs.h"
  18
  19 static uint8_t base = 0x70;
  20
  21 static int bcd2dec(int value)
  22 {
  23     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  24 }
  25
  26 static uint8_t cmos_read(uint8_t reg)
  27 {
  28     outb(base + 0, reg);
  29     return inb(base + 1);
  30 }
  31
  32 static void cmos_write(uint8_t reg, uint8_t val)
  33 {
  34     outb(base + 0, reg);
  35     outb(base + 1, val);
  36 }
  37
  38 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  39 {
  40     time_t a, b;
  41     struct tm d1, d2;
  42
  43     memcpy(&d1, lhs, sizeof(d1));
  44     memcpy(&d2, rhs, sizeof(d2));
  45
  46     a = mktime(&d1);
  47     b = mktime(&d2);
  48
  49     if (a < b) {
  50         return -1;
  51     } else if (a > b) {
  52         return 1;
  53     }
  54
  55     return 0;
  56 }
  57
  58 #if 0
  59 static void print_tm(struct tm *tm)
  60 {
  61     printf("%04d-%02d-%02d %02d:%02d:%02d\n",
  62            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
  63            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
  64 }
  65 #endif
  66
  67 static void cmos_get_date_time(struct tm *date)
  68 {
  69     int base_year = 2000, hour_offset;
  70     int sec, min, hour, mday, mon, year;
  71     time_t ts;
  72     struct tm dummy;
  73
  74     sec = cmos_read(RTC_SECONDS);
  75     min = cmos_read(RTC_MINUTES);
  76     hour = cmos_read(RTC_HOURS);
  77     mday = cmos_read(RTC_DAY_OF_MONTH);
  78     mon = cmos_read(RTC_MONTH);
  79     year = cmos_read(RTC_YEAR);
  80
  81     if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
  82         sec = bcd2dec(sec);
  83         min = bcd2dec(min);
  84         hour = bcd2dec(hour);
  85         mday = bcd2dec(mday);
  86         mon = bcd2dec(mon);
  87         year = bcd2dec(year);
  88         hour_offset = 80;
  89     } else {
  90         hour_offset = 0x80;
  91     }
  92
  93     if ((cmos_read(0x0B) & REG_B_24H) == 0) {
  94         if (hour >= hour_offset) {
  95             hour -= hour_offset;
  96             hour += 12;
  97         }
  98     }
  99
 100     ts = time(NULL);
 101     localtime_r(&ts, &dummy);
 102
 103     date->tm_isdst = dummy.tm_isdst;
 104     date->tm_sec = sec;
 105     date->tm_min = min;
 106     date->tm_hour = hour;
 107     date->tm_mday = mday;
 108     date->tm_mon = mon - 1;
 109     date->tm_year = base_year + year - 1900;
 110 #ifndef __sun__
 111     date->tm_gmtoff = 0;
 112 #endif
 113
 114     ts = mktime(date);
 115 }
 116
 117 static void check_time(int wiggle)
 118 {
 119     struct tm start, date[4], end;
 120     struct tm *datep;
 121     time_t ts;
 122
 123     /*
 124      * This check assumes a few things.  First, we cannot guarantee that we get
 125      * a consistent reading from the wall clock because we may hit an edge of
 126      * the clock while reading.  To work around this, we read four clock readings
 127      * such that at least two of them should match.  We need to assume that one
 128      * reading is corrupt so we need four readings to ensure that we have at
 129      * least two consecutive identical readings
 130      *
 131      * It's also possible that we'll cross an edge reading the host clock so
 132      * simply check to make sure that the clock reading is within the period of
 133      * when we expect it to be.
 134      */
 135
 136     ts = time(NULL);
 137     gmtime_r(&ts, &start);
 138
 139     cmos_get_date_time(&date[0]);
 140     cmos_get_date_time(&date[1]);
 141     cmos_get_date_time(&date[2]);
 142     cmos_get_date_time(&date[3]);
 143
 144     ts = time(NULL);
 145     gmtime_r(&ts, &end);
 146
 147     if (tm_cmp(&date[0], &date[1]) == 0) {
 148         datep = &date[0];
 149     } else if (tm_cmp(&date[1], &date[2]) == 0) {
 150         datep = &date[1];
 151     } else if (tm_cmp(&date[2], &date[3]) == 0) {
 152         datep = &date[2];
 153     } else {
 154         g_assert_not_reached();
 155     }
 156
 157     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
 158         long t, s;
 159
 160         start.tm_isdst = datep->tm_isdst;
 161
 162         t = (long)mktime(datep);
 163         s = (long)mktime(&start);
 164         if (t < s) {
 165             g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
 166         } else {
 167             g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
 168         }
 169
 170         g_assert_cmpint(ABS(t - s), <=, wiggle);
 171     }
 172 }
 173
 174 static int wiggle = 2;
 175
 176 static void set_year_20xx(void)
 177 {
 178     /* Set BCD mode */
 179     cmos_write(RTC_REG_B, REG_B_24H);
 180     cmos_write(RTC_REG_A, 0x76);
 181     cmos_write(RTC_YEAR, 0x11);
 182     cmos_write(RTC_CENTURY, 0x20);
 183     cmos_write(RTC_MONTH, 0x02);
 184     cmos_write(RTC_DAY_OF_MONTH, 0x02);
 185     cmos_write(RTC_HOURS, 0x02);
 186     cmos_write(RTC_MINUTES, 0x04);
 187     cmos_write(RTC_SECONDS, 0x58);
 188     cmos_write(RTC_REG_A, 0x26);
 189
 190     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 191     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 192     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 193     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 194     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 195     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 196     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 197
 198     if (sizeof(time_t) == 4) {
 199         return;
 200     }
 201
 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);
 206
 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);
 213     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 214
 215     cmos_write(RTC_REG_A, 0x76);
 216     cmos_write(RTC_YEAR, 0x11);
 217     cmos_write(RTC_REG_A, 0x26);
 218
 219     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 220     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 221     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 222     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 223     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 224     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 225     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 226 }
 227
 228 static void set_year_1980(void)
 229 {
 230     /* Set BCD mode */
 231     cmos_write(RTC_REG_B, REG_B_24H);
 232     cmos_write(RTC_REG_A, 0x76);
 233     cmos_write(RTC_YEAR, 0x80);
 234     cmos_write(RTC_CENTURY, 0x19);
 235     cmos_write(RTC_MONTH, 0x02);
 236     cmos_write(RTC_DAY_OF_MONTH, 0x02);
 237     cmos_write(RTC_HOURS, 0x02);
 238     cmos_write(RTC_MINUTES, 0x04);
 239     cmos_write(RTC_SECONDS, 0x58);
 240     cmos_write(RTC_REG_A, 0x26);
 241
 242     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 243     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 244     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 245     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 246     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 247     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x80);
 248     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x19);
 249 }
 250
 251 static void bcd_check_time(void)
 252 {
 253     /* Set BCD mode */
 254     cmos_write(RTC_REG_B, REG_B_24H);
 255     check_time(wiggle);
 256 }
 257
 258 static void dec_check_time(void)
 259 {
 260     /* Set DEC mode */
 261     cmos_write(RTC_REG_B, REG_B_24H | REG_B_DM);
 262     check_time(wiggle);
 263 }
 264
 265 static void alarm_time(void)
 266 {
 267     struct tm now;
 268     time_t ts;
 269     int i;
 270
 271     ts = time(NULL);
 272     gmtime_r(&ts, &now);
 273
 274     /* set DEC mode */
 275     cmos_write(RTC_REG_B, REG_B_24H | REG_B_DM);
 276
 277     g_assert(!get_irq(RTC_ISA_IRQ));
 278     cmos_read(RTC_REG_C);
 279
 280     now.tm_sec = (now.tm_sec + 2) % 60;
 281     cmos_write(RTC_SECONDS_ALARM, now.tm_sec);
 282     cmos_write(RTC_MINUTES_ALARM, RTC_ALARM_DONT_CARE);
 283     cmos_write(RTC_HOURS_ALARM, RTC_ALARM_DONT_CARE);
 284     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_AIE);
 285
 286     for (i = 0; i < 2 + wiggle; i++) {
 287         if (get_irq(RTC_ISA_IRQ)) {
 288             break;
 289         }
 290
 291         clock_step(1000000000);
 292     }
 293
 294     g_assert(get_irq(RTC_ISA_IRQ));
 295     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 296     g_assert(cmos_read(RTC_REG_C) == 0);
 297 }
 298
 299 static void set_time(int mode, int h, int m, int s)
 300 {
 301     /* set BCD 12 hour mode */
 302     cmos_write(RTC_REG_B, mode);
 303
 304     cmos_write(RTC_REG_A, 0x76);
 305     cmos_write(RTC_HOURS, h);
 306     cmos_write(RTC_MINUTES, m);
 307     cmos_write(RTC_SECONDS, s);
 308     cmos_write(RTC_REG_A, 0x26);
 309 }
 310
 311 #define assert_time(h, m, s) \
 312     do { \
 313         g_assert_cmpint(cmos_read(RTC_HOURS), ==, h); \
 314         g_assert_cmpint(cmos_read(RTC_MINUTES), ==, m); \
 315         g_assert_cmpint(cmos_read(RTC_SECONDS), ==, s); \
 316     } while(0)
 317
 318 static void basic_12h_bcd(void)
 319 {
 320     /* set BCD 12 hour mode */
 321     set_time(0, 0x81, 0x59, 0x00);
 322     clock_step(1000000000LL);
 323     assert_time(0x81, 0x59, 0x01);
 324     clock_step(59000000000LL);
 325     assert_time(0x82, 0x00, 0x00);
 326
 327     /* test BCD wraparound */
 328     set_time(0, 0x09, 0x59, 0x59);
 329     clock_step(60000000000LL);
 330     assert_time(0x10, 0x00, 0x59);
 331
 332     /* 12 AM -> 1 AM */
 333     set_time(0, 0x12, 0x59, 0x59);
 334     clock_step(1000000000LL);
 335     assert_time(0x01, 0x00, 0x00);
 336
 337     /* 12 PM -> 1 PM */
 338     set_time(0, 0x92, 0x59, 0x59);
 339     clock_step(1000000000LL);
 340     assert_time(0x81, 0x00, 0x00);
 341
 342     /* 11 AM -> 12 PM */
 343     set_time(0, 0x11, 0x59, 0x59);
 344     clock_step(1000000000LL);
 345     assert_time(0x92, 0x00, 0x00);
 346     /* TODO: test day wraparound */
 347
 348     /* 11 PM -> 12 AM */
 349     set_time(0, 0x91, 0x59, 0x59);
 350     clock_step(1000000000LL);
 351     assert_time(0x12, 0x00, 0x00);
 352     /* TODO: test day wraparound */
 353 }
 354
 355 static void basic_12h_dec(void)
 356 {
 357     /* set decimal 12 hour mode */
 358     set_time(REG_B_DM, 0x81, 59, 0);
 359     clock_step(1000000000LL);
 360     assert_time(0x81, 59, 1);
 361     clock_step(59000000000LL);
 362     assert_time(0x82, 0, 0);
 363
 364     /* 12 PM -> 1 PM */
 365     set_time(REG_B_DM, 0x8c, 59, 59);
 366     clock_step(1000000000LL);
 367     assert_time(0x81, 0, 0);
 368
 369     /* 12 AM -> 1 AM */
 370     set_time(REG_B_DM, 0x0c, 59, 59);
 371     clock_step(1000000000LL);
 372     assert_time(0x01, 0, 0);
 373
 374     /* 11 AM -> 12 PM */
 375     set_time(REG_B_DM, 0x0b, 59, 59);
 376     clock_step(1000000000LL);
 377     assert_time(0x8c, 0, 0);
 378
 379     /* 11 PM -> 12 AM */
 380     set_time(REG_B_DM, 0x8b, 59, 59);
 381     clock_step(1000000000LL);
 382     assert_time(0x0c, 0, 0);
 383     /* TODO: test day wraparound */
 384 }
 385
 386 static void basic_24h_bcd(void)
 387 {
 388     /* set BCD 24 hour mode */
 389     set_time(REG_B_24H, 0x09, 0x59, 0x00);
 390     clock_step(1000000000LL);
 391     assert_time(0x09, 0x59, 0x01);
 392     clock_step(59000000000LL);
 393     assert_time(0x10, 0x00, 0x00);
 394
 395     /* test BCD wraparound */
 396     set_time(REG_B_24H, 0x09, 0x59, 0x00);
 397     clock_step(60000000000LL);
 398     assert_time(0x10, 0x00, 0x00);
 399
 400     /* TODO: test day wraparound */
 401     set_time(REG_B_24H, 0x23, 0x59, 0x00);
 402     clock_step(60000000000LL);
 403     assert_time(0x00, 0x00, 0x00);
 404 }
 405
 406 static void basic_24h_dec(void)
 407 {
 408     /* set decimal 24 hour mode */
 409     set_time(REG_B_24H | REG_B_DM, 9, 59, 0);
 410     clock_step(1000000000LL);
 411     assert_time(9, 59, 1);
 412     clock_step(59000000000LL);
 413     assert_time(10, 0, 0);
 414
 415     /* test BCD wraparound */
 416     set_time(REG_B_24H | REG_B_DM, 9, 59, 0);
 417     clock_step(60000000000LL);
 418     assert_time(10, 0, 0);
 419
 420     /* TODO: test day wraparound */
 421     set_time(REG_B_24H | REG_B_DM, 23, 59, 0);
 422     clock_step(60000000000LL);
 423     assert_time(0, 0, 0);
 424 }
 425
 426 static void am_pm_alarm(void)
 427 {
 428     cmos_write(RTC_MINUTES_ALARM, 0xC0);
 429     cmos_write(RTC_SECONDS_ALARM, 0xC0);
 430
 431     /* set BCD 12 hour mode */
 432     cmos_write(RTC_REG_B, 0);
 433
 434     /* Set time and alarm hour.  */
 435     cmos_write(RTC_REG_A, 0x76);
 436     cmos_write(RTC_HOURS_ALARM, 0x82);
 437     cmos_write(RTC_HOURS, 0x81);
 438     cmos_write(RTC_MINUTES, 0x59);
 439     cmos_write(RTC_SECONDS, 0x00);
 440     cmos_read(RTC_REG_C);
 441     cmos_write(RTC_REG_A, 0x26);
 442
 443     /* Check that alarm triggers when AM/PM is set.  */
 444     clock_step(60000000000LL);
 445     g_assert(cmos_read(RTC_HOURS) == 0x82);
 446     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 447
 448     /*
 449      * Each of the following two tests takes over 60 seconds due to the time
 450      * needed to report the PIT interrupts.  Unfortunately, our PIT device
 451      * model keeps counting even when GATE=0, so we cannot simply disable
 452      * it in main().
 453      */
 454     if (g_test_quick()) {
 455         return;
 456     }
 457
 458     /* set DEC 12 hour mode */
 459     cmos_write(RTC_REG_B, REG_B_DM);
 460
 461     /* Set time and alarm hour.  */
 462     cmos_write(RTC_REG_A, 0x76);
 463     cmos_write(RTC_HOURS_ALARM, 0x82);
 464     cmos_write(RTC_HOURS, 3);
 465     cmos_write(RTC_MINUTES, 0);
 466     cmos_write(RTC_SECONDS, 0);
 467     cmos_read(RTC_REG_C);
 468     cmos_write(RTC_REG_A, 0x26);
 469
 470     /* Check that alarm triggers.  */
 471     clock_step(3600 * 11 * 1000000000LL);
 472     g_assert(cmos_read(RTC_HOURS) == 0x82);
 473     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
 474
 475     /* Same as above, with inverted HOURS and HOURS_ALARM.  */
 476     cmos_write(RTC_REG_A, 0x76);
 477     cmos_write(RTC_HOURS_ALARM, 2);
 478     cmos_write(RTC_HOURS, 3);
 479     cmos_write(RTC_MINUTES, 0);
 480     cmos_write(RTC_SECONDS, 0);
 481     cmos_read(RTC_REG_C);
 482     cmos_write(RTC_REG_A, 0x26);
 483
 484     /* Check that alarm does not trigger if hours differ only by AM/PM.  */
 485     clock_step(3600 * 11 * 1000000000LL);
 486     g_assert(cmos_read(RTC_HOURS) == 0x82);
 487     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) == 0);
 488 }
 489
 490 /* success if no crash or abort */
 491 static void fuzz_registers(void)
 492 {
 493     unsigned int i;
 494
 495     for (i = 0; i < 1000; i++) {
 496         uint8_t reg, val;
 497
 498         reg = (uint8_t)g_test_rand_int_range(0, 16);
 499         val = (uint8_t)g_test_rand_int_range(0, 256);
 500
 501         cmos_write(reg, val);
 502         cmos_read(reg);
 503     }
 504 }
 505
 506 static void register_b_set_flag(void)
 507 {
 508     /* Enable binary-coded decimal (BCD) mode and SET flag in Register B*/
 509     cmos_write(RTC_REG_B, REG_B_24H | REG_B_SET);
 510
 511     cmos_write(RTC_REG_A, 0x76);
 512     cmos_write(RTC_YEAR, 0x11);
 513     cmos_write(RTC_CENTURY, 0x20);
 514     cmos_write(RTC_MONTH, 0x02);
 515     cmos_write(RTC_DAY_OF_MONTH, 0x02);
 516     cmos_write(RTC_HOURS, 0x02);
 517     cmos_write(RTC_MINUTES, 0x04);
 518     cmos_write(RTC_SECONDS, 0x58);
 519     cmos_write(RTC_REG_A, 0x26);
 520
 521     /* Since SET flag is still enabled, these are equality checks. */
 522     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 523     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 524     g_assert_cmpint(cmos_read(RTC_SECONDS), ==, 0x58);
 525     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 526     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 527     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 528     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 529
 530     /* Disable SET flag in Register B */
 531     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_SET);
 532
 533     g_assert_cmpint(cmos_read(RTC_HOURS), ==, 0x02);
 534     g_assert_cmpint(cmos_read(RTC_MINUTES), ==, 0x04);
 535
 536     /* Since SET flag is disabled, this is an inequality check.
 537      * We (reasonably) assume that no (sexagesimal) overflow occurs. */
 538     g_assert_cmpint(cmos_read(RTC_SECONDS), >=, 0x58);
 539     g_assert_cmpint(cmos_read(RTC_DAY_OF_MONTH), ==, 0x02);
 540     g_assert_cmpint(cmos_read(RTC_MONTH), ==, 0x02);
 541     g_assert_cmpint(cmos_read(RTC_YEAR), ==, 0x11);
 542     g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20);
 543 }
 544
 545 int main(int argc, char **argv)
 546 {
 547     QTestState *s = NULL;
 548     int ret;
 549
 550     g_test_init(&argc, &argv, NULL);
 551
 552     s = qtest_start("-rtc clock=vm");
 553     qtest_irq_intercept_in(s, "ioapic");
 554
 555     qtest_add_func("/rtc/check-time/bcd", bcd_check_time);
 556     qtest_add_func("/rtc/check-time/dec", dec_check_time);
 557     qtest_add_func("/rtc/alarm/interrupt", alarm_time);
 558     qtest_add_func("/rtc/alarm/am-pm", am_pm_alarm);
 559     qtest_add_func("/rtc/basic/dec-24h", basic_24h_dec);
 560     qtest_add_func("/rtc/basic/bcd-24h", basic_24h_bcd);
 561     qtest_add_func("/rtc/basic/dec-12h", basic_12h_dec);
 562     qtest_add_func("/rtc/basic/bcd-12h", basic_12h_bcd);
 563     qtest_add_func("/rtc/set-year/20xx", set_year_20xx);
 564     qtest_add_func("/rtc/set-year/1980", set_year_1980);
 565     qtest_add_func("/rtc/misc/register_b_set_flag", register_b_set_flag);
 566     qtest_add_func("/rtc/misc/fuzz-registers", fuzz_registers);
 567     ret = g_test_run();
 568
 569     if (s) {
 570         qtest_quit(s);
 571     }
 572
 573     return ret;
 574 }