tests/m48t59-test.c

   1 /*
   2  * QTest testcase for the M48T59 and M48T08 real-time clocks
   3  *
   4  * Based on MC146818 RTC test:
   5  * Copyright IBM, Corp. 2012
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include <glib.h>
  17
  18 #include "libqtest.h"
  19
  20 #define RTC_SECONDS             0x9
  21 #define RTC_MINUTES             0xa
  22 #define RTC_HOURS               0xb
  23
  24 #define RTC_DAY_OF_WEEK         0xc
  25 #define RTC_DAY_OF_MONTH        0xd
  26 #define RTC_MONTH               0xe
  27 #define RTC_YEAR                0xf
  28
  29 static uint32_t base;
  30 static uint16_t reg_base = 0x1ff0; /* 0x7f0 for m48t02 */
  31 static int base_year;
  32 static bool use_mmio;
  33
  34 static uint8_t cmos_read_mmio(uint8_t reg)
  35 {
  36     return readb(base + (uint32_t)reg_base + (uint32_t)reg);
  37 }
  38
  39 static void cmos_write_mmio(uint8_t reg, uint8_t val)
  40 {
  41     uint8_t data = val;
  42
  43     writeb(base + (uint32_t)reg_base + (uint32_t)reg, data);
  44 }
  45
  46 static uint8_t cmos_read_ioio(uint8_t reg)
  47 {
  48     outw(base + 0, reg_base + (uint16_t)reg);
  49     return inb(base + 3);
  50 }
  51
  52 static void cmos_write_ioio(uint8_t reg, uint8_t val)
  53 {
  54     outw(base + 0, reg_base + (uint16_t)reg);
  55     outb(base + 3, val);
  56 }
  57
  58 static uint8_t cmos_read(uint8_t reg)
  59 {
  60     if (use_mmio) {
  61         return cmos_read_mmio(reg);
  62     } else {
  63         return cmos_read_ioio(reg);
  64     }
  65 }
  66
  67 static void cmos_write(uint8_t reg, uint8_t val)
  68 {
  69     if (use_mmio) {
  70         cmos_write_mmio(reg, val);
  71     } else {
  72         cmos_write_ioio(reg, val);
  73     }
  74 }
  75
  76 static int bcd2dec(int value)
  77 {
  78     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  79 }
  80
  81 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  82 {
  83     time_t a, b;
  84     struct tm d1, d2;
  85
  86     memcpy(&d1, lhs, sizeof(d1));
  87     memcpy(&d2, rhs, sizeof(d2));
  88
  89     a = mktime(&d1);
  90     b = mktime(&d2);
  91
  92     if (a < b) {
  93         return -1;
  94     } else if (a > b) {
  95         return 1;
  96     }
  97
  98     return 0;
  99 }
 100
 101 #if 0
 102 static void print_tm(struct tm *tm)
 103 {
 104     printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
 105            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 106            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
 107 }
 108 #endif
 109
 110 static void cmos_get_date_time(struct tm *date)
 111 {
 112     int sec, min, hour, mday, mon, year;
 113     time_t ts;
 114     struct tm dummy;
 115
 116     sec = cmos_read(RTC_SECONDS);
 117     min = cmos_read(RTC_MINUTES);
 118     hour = cmos_read(RTC_HOURS);
 119     mday = cmos_read(RTC_DAY_OF_MONTH);
 120     mon = cmos_read(RTC_MONTH);
 121     year = cmos_read(RTC_YEAR);
 122
 123     sec = bcd2dec(sec);
 124     min = bcd2dec(min);
 125     hour = bcd2dec(hour);
 126     mday = bcd2dec(mday);
 127     mon = bcd2dec(mon);
 128     year = bcd2dec(year);
 129
 130     ts = time(NULL);
 131     localtime_r(&ts, &dummy);
 132
 133     date->tm_isdst = dummy.tm_isdst;
 134     date->tm_sec = sec;
 135     date->tm_min = min;
 136     date->tm_hour = hour;
 137     date->tm_mday = mday;
 138     date->tm_mon = mon - 1;
 139     date->tm_year = base_year + year - 1900;
 140 #ifndef __sun__
 141     date->tm_gmtoff = 0;
 142 #endif
 143
 144     ts = mktime(date);
 145 }
 146
 147 static void check_time(int wiggle)
 148 {
 149     struct tm start, date[4], end;
 150     struct tm *datep;
 151     time_t ts;
 152
 153     /*
 154      * This check assumes a few things.  First, we cannot guarantee that we get
 155      * a consistent reading from the wall clock because we may hit an edge of
 156      * the clock while reading.  To work around this, we read four clock readings
 157      * such that at least two of them should match.  We need to assume that one
 158      * reading is corrupt so we need four readings to ensure that we have at
 159      * least two consecutive identical readings
 160      *
 161      * It's also possible that we'll cross an edge reading the host clock so
 162      * simply check to make sure that the clock reading is within the period of
 163      * when we expect it to be.
 164      */
 165
 166     ts = time(NULL);
 167     gmtime_r(&ts, &start);
 168
 169     cmos_get_date_time(&date[0]);
 170     cmos_get_date_time(&date[1]);
 171     cmos_get_date_time(&date[2]);
 172     cmos_get_date_time(&date[3]);
 173
 174     ts = time(NULL);
 175     gmtime_r(&ts, &end);
 176
 177     if (tm_cmp(&date[0], &date[1]) == 0) {
 178         datep = &date[0];
 179     } else if (tm_cmp(&date[1], &date[2]) == 0) {
 180         datep = &date[1];
 181     } else if (tm_cmp(&date[2], &date[3]) == 0) {
 182         datep = &date[2];
 183     } else {
 184         g_assert_not_reached();
 185     }
 186
 187     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
 188         long t, s;
 189
 190         start.tm_isdst = datep->tm_isdst;
 191
 192         t = (long)mktime(datep);
 193         s = (long)mktime(&start);
 194         if (t < s) {
 195             g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
 196         } else {
 197             g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
 198         }
 199
 200         g_assert_cmpint(ABS(t - s), <=, wiggle);
 201     }
 202 }
 203
 204 static int wiggle = 2;
 205
 206 static void bcd_check_time(void)
 207 {
 208     if (strcmp(qtest_get_arch(), "sparc64") == 0) {
 209         base = 0x74;
 210         base_year = 1900;
 211         use_mmio = false;
 212     } else if (strcmp(qtest_get_arch(), "sparc") == 0) {
 213         base = 0x71200000;
 214         base_year = 1968;
 215         use_mmio = true;
 216     } else { /* PPC: need to map macio in PCI */
 217         g_assert_not_reached();
 218     }
 219     check_time(wiggle);
 220 }
 221
 222 /* success if no crash or abort */
 223 static void fuzz_registers(void)
 224 {
 225     unsigned int i;
 226
 227     for (i = 0; i < 1000; i++) {
 228         uint8_t reg, val;
 229
 230         reg = (uint8_t)g_test_rand_int_range(0, 16);
 231         val = (uint8_t)g_test_rand_int_range(0, 256);
 232
 233         if (reg == 7) {
 234             /* watchdog setup register, may trigger system reset, skip */
 235             continue;
 236         }
 237
 238         cmos_write(reg, val);
 239         cmos_read(reg);
 240     }
 241 }
 242
 243 int main(int argc, char **argv)
 244 {
 245     QTestState *s = NULL;
 246     int ret;
 247
 248     g_test_init(&argc, &argv, NULL);
 249
 250     s = qtest_start("-rtc clock=vm");
 251
 252     qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
 253     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
 254     ret = g_test_run();
 255
 256     if (s) {
 257         qtest_quit(s);
 258     }
 259
 260     return ret;
 261 }