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Annotation of qemu/tests/rtc-test.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QTest testcase for the MC146818 real-time clock
        !             3:  *
        !             4:  * Copyright IBM, Corp. 2012
        !             5:  *
        !             6:  * Authors:
        !             7:  *  Anthony Liguori   <[email protected]>
        !             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: #include "libqtest.h"
        !            14: #include "hw/mc146818rtc_regs.h"
        !            15: 
        !            16: #include <glib.h>
        !            17: #include <stdio.h>
        !            18: #include <string.h>
        !            19: #include <stdlib.h>
        !            20: #include <unistd.h>
        !            21: 
        !            22: static uint8_t base = 0x70;
        !            23: 
        !            24: static int bcd2dec(int value)
        !            25: {
        !            26:     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
        !            27: }
        !            28: 
        !            29: static int dec2bcd(int value)
        !            30: {
        !            31:     return ((value / 10) << 4) | (value % 10);
        !            32: }
        !            33: 
        !            34: static uint8_t cmos_read(uint8_t reg)
        !            35: {
        !            36:     outb(base + 0, reg);
        !            37:     return inb(base + 1);
        !            38: }
        !            39: 
        !            40: static void cmos_write(uint8_t reg, uint8_t val)
        !            41: {
        !            42:     outb(base + 0, reg);
        !            43:     outb(base + 1, val);
        !            44: }
        !            45: 
        !            46: static int tm_cmp(struct tm *lhs, struct tm *rhs)
        !            47: {
        !            48:     time_t a, b;
        !            49:     struct tm d1, d2;
        !            50: 
        !            51:     memcpy(&d1, lhs, sizeof(d1));
        !            52:     memcpy(&d2, rhs, sizeof(d2));
        !            53: 
        !            54:     a = mktime(&d1);
        !            55:     b = mktime(&d2);
        !            56: 
        !            57:     if (a < b) {
        !            58:         return -1;
        !            59:     } else if (a > b) {
        !            60:         return 1;
        !            61:     }
        !            62: 
        !            63:     return 0;
        !            64: }
        !            65: 
        !            66: #if 0
        !            67: static void print_tm(struct tm *tm)
        !            68: {
        !            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);
        !            72: }
        !            73: #endif
        !            74: 
        !            75: static void cmos_get_date_time(struct tm *date)
        !            76: {
        !            77:     int base_year = 2000, hour_offset;
        !            78:     int sec, min, hour, mday, mon, year;
        !            79:     time_t ts;
        !            80:     struct tm dummy;
        !            81: 
        !            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);
        !            88: 
        !            89:     if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
        !            90:         sec = bcd2dec(sec);
        !            91:         min = bcd2dec(min);
        !            92:         hour = bcd2dec(hour);
        !            93:         mday = bcd2dec(mday);
        !            94:         mon = bcd2dec(mon);
        !            95:         year = bcd2dec(year);
        !            96:         hour_offset = 80;
        !            97:     } else {
        !            98:         hour_offset = 0x80;
        !            99:     }
        !           100: 
        !           101:     if ((cmos_read(0x0B) & REG_B_24H) == 0) {
        !           102:         if (hour >= hour_offset) {
        !           103:             hour -= hour_offset;
        !           104:             hour += 12;
        !           105:         }
        !           106:     }
        !           107: 
        !           108:     ts = time(NULL);
        !           109:     localtime_r(&ts, &dummy);
        !           110: 
        !           111:     date->tm_isdst = dummy.tm_isdst;
        !           112:     date->tm_sec = sec;
        !           113:     date->tm_min = min;
        !           114:     date->tm_hour = hour;
        !           115:     date->tm_mday = mday;
        !           116:     date->tm_mon = mon - 1;
        !           117:     date->tm_year = base_year + year - 1900;
        !           118:     date->tm_gmtoff = 0;
        !           119: 
        !           120:     ts = mktime(date);
        !           121: }
        !           122: 
        !           123: static void check_time(int wiggle)
        !           124: {
        !           125:     struct tm start, date[4], end;
        !           126:     struct tm *datep;
        !           127:     time_t ts;
        !           128: 
        !           129:     /*
        !           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
        !           136:      *
        !           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.
        !           140:      */
        !           141: 
        !           142:     ts = time(NULL);
        !           143:     gmtime_r(&ts, &start);
        !           144: 
        !           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]);
        !           149: 
        !           150:     ts = time(NULL);
        !           151:     gmtime_r(&ts, &end);
        !           152: 
        !           153:     if (tm_cmp(&date[0], &date[1]) == 0) {
        !           154:         datep = &date[0];
        !           155:     } else if (tm_cmp(&date[1], &date[2]) == 0) {
        !           156:         datep = &date[1];
        !           157:     } else if (tm_cmp(&date[2], &date[3]) == 0) {
        !           158:         datep = &date[2];
        !           159:     } else {
        !           160:         g_assert_not_reached();
        !           161:     }
        !           162: 
        !           163:     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
        !           164:         long t, s;
        !           165: 
        !           166:         start.tm_isdst = datep->tm_isdst;
        !           167: 
        !           168:         t = (long)mktime(datep);
        !           169:         s = (long)mktime(&start);
        !           170:         if (t < s) {
        !           171:             g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
        !           172:         } else {
        !           173:             g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
        !           174:         }
        !           175: 
        !           176:         g_assert_cmpint(ABS(t - s), <=, wiggle);
        !           177:     }
        !           178: }
        !           179: 
        !           180: static int wiggle = 2;
        !           181: 
        !           182: static void bcd_check_time(void)
        !           183: {
        !           184:     /* Set BCD mode */
        !           185:     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_DM);
        !           186:     check_time(wiggle);
        !           187: }
        !           188: 
        !           189: static void dec_check_time(void)
        !           190: {
        !           191:     /* Set DEC mode */
        !           192:     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
        !           193:     check_time(wiggle);
        !           194: }
        !           195: 
        !           196: static void set_alarm_time(struct tm *tm)
        !           197: {
        !           198:     int sec;
        !           199: 
        !           200:     sec = tm->tm_sec;
        !           201: 
        !           202:     if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
        !           203:         sec = dec2bcd(sec);
        !           204:     }
        !           205: 
        !           206:     cmos_write(RTC_SECONDS_ALARM, sec);
        !           207:     cmos_write(RTC_MINUTES_ALARM, RTC_ALARM_DONT_CARE);
        !           208:     cmos_write(RTC_HOURS_ALARM, RTC_ALARM_DONT_CARE);
        !           209: }
        !           210: 
        !           211: static void alarm_time(void)
        !           212: {
        !           213:     struct tm now;
        !           214:     time_t ts;
        !           215:     int i;
        !           216: 
        !           217:     ts = time(NULL);
        !           218:     gmtime_r(&ts, &now);
        !           219: 
        !           220:     /* set DEC mode */
        !           221:     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
        !           222: 
        !           223:     g_assert(!get_irq(RTC_ISA_IRQ));
        !           224:     cmos_read(RTC_REG_C);
        !           225: 
        !           226:     now.tm_sec = (now.tm_sec + 2) % 60;
        !           227:     set_alarm_time(&now);
        !           228:     cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_AIE);
        !           229: 
        !           230:     for (i = 0; i < 2 + wiggle; i++) {
        !           231:         if (get_irq(RTC_ISA_IRQ)) {
        !           232:             break;
        !           233:         }
        !           234: 
        !           235:         clock_step(1000000000);
        !           236:     }
        !           237: 
        !           238:     g_assert(get_irq(RTC_ISA_IRQ));
        !           239:     g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
        !           240:     g_assert(cmos_read(RTC_REG_C) == 0);
        !           241: }
        !           242: 
        !           243: /* success if no crash or abort */
        !           244: static void fuzz_registers(void)
        !           245: {
        !           246:     unsigned int i;
        !           247: 
        !           248:     for (i = 0; i < 1000; i++) {
        !           249:         uint8_t reg, val;
        !           250: 
        !           251:         reg = (uint8_t)g_test_rand_int_range(0, 16);
        !           252:         val = (uint8_t)g_test_rand_int_range(0, 256);
        !           253: 
        !           254:         cmos_write(reg, val);
        !           255:         cmos_read(reg);
        !           256:     }
        !           257: }
        !           258: 
        !           259: int main(int argc, char **argv)
        !           260: {
        !           261:     QTestState *s = NULL;
        !           262:     int ret;
        !           263: 
        !           264:     g_test_init(&argc, &argv, NULL);
        !           265: 
        !           266:     s = qtest_start("-display none -rtc clock=vm");
        !           267:     qtest_irq_intercept_in(s, "ioapic");
        !           268: 
        !           269:     qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
        !           270:     qtest_add_func("/rtc/dec/check-time", dec_check_time);
        !           271:     qtest_add_func("/rtc/alarm-time", alarm_time);
        !           272:     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
        !           273:     ret = g_test_run();
        !           274: 
        !           275:     if (s) {
        !           276:         qtest_quit(s);
        !           277:     }
        !           278: 
        !           279:     return ret;
        !           280: }

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