85215d419b
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
281 lines
6.3 KiB
C
281 lines
6.3 KiB
C
/*
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* QTest testcase for the MC146818 real-time clock
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "libqtest.h"
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#include "hw/mc146818rtc_regs.h"
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#include <glib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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static uint8_t base = 0x70;
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static int bcd2dec(int value)
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{
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return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
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}
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static int dec2bcd(int value)
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{
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return ((value / 10) << 4) | (value % 10);
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}
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static uint8_t cmos_read(uint8_t reg)
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{
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outb(base + 0, reg);
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return inb(base + 1);
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}
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static void cmos_write(uint8_t reg, uint8_t val)
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{
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outb(base + 0, reg);
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outb(base + 1, val);
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}
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static int tm_cmp(struct tm *lhs, struct tm *rhs)
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{
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time_t a, b;
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struct tm d1, d2;
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memcpy(&d1, lhs, sizeof(d1));
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memcpy(&d2, rhs, sizeof(d2));
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a = mktime(&d1);
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b = mktime(&d2);
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if (a < b) {
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return -1;
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} else if (a > b) {
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return 1;
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}
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return 0;
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}
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#if 0
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static void print_tm(struct tm *tm)
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{
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printf("%04d-%02d-%02d %02d:%02d:%02d\n",
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tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
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}
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#endif
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static void cmos_get_date_time(struct tm *date)
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{
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int base_year = 2000, hour_offset;
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int sec, min, hour, mday, mon, year;
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time_t ts;
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struct tm dummy;
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sec = cmos_read(RTC_SECONDS);
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min = cmos_read(RTC_MINUTES);
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hour = cmos_read(RTC_HOURS);
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mday = cmos_read(RTC_DAY_OF_MONTH);
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mon = cmos_read(RTC_MONTH);
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year = cmos_read(RTC_YEAR);
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if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
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sec = bcd2dec(sec);
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min = bcd2dec(min);
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hour = bcd2dec(hour);
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mday = bcd2dec(mday);
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mon = bcd2dec(mon);
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year = bcd2dec(year);
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hour_offset = 80;
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} else {
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hour_offset = 0x80;
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}
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if ((cmos_read(0x0B) & REG_B_24H) == 0) {
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if (hour >= hour_offset) {
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hour -= hour_offset;
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hour += 12;
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}
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}
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ts = time(NULL);
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localtime_r(&ts, &dummy);
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date->tm_isdst = dummy.tm_isdst;
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date->tm_sec = sec;
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date->tm_min = min;
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date->tm_hour = hour;
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date->tm_mday = mday;
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date->tm_mon = mon - 1;
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date->tm_year = base_year + year - 1900;
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date->tm_gmtoff = 0;
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ts = mktime(date);
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}
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static void check_time(int wiggle)
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{
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struct tm start, date[4], end;
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struct tm *datep;
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time_t ts;
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/*
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* This check assumes a few things. First, we cannot guarantee that we get
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* a consistent reading from the wall clock because we may hit an edge of
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* the clock while reading. To work around this, we read four clock readings
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* such that at least two of them should match. We need to assume that one
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* reading is corrupt so we need four readings to ensure that we have at
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* least two consecutive identical readings
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*
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* It's also possible that we'll cross an edge reading the host clock so
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* simply check to make sure that the clock reading is within the period of
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* when we expect it to be.
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*/
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ts = time(NULL);
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gmtime_r(&ts, &start);
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cmos_get_date_time(&date[0]);
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cmos_get_date_time(&date[1]);
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cmos_get_date_time(&date[2]);
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cmos_get_date_time(&date[3]);
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ts = time(NULL);
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gmtime_r(&ts, &end);
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if (tm_cmp(&date[0], &date[1]) == 0) {
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datep = &date[0];
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} else if (tm_cmp(&date[1], &date[2]) == 0) {
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datep = &date[1];
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} else if (tm_cmp(&date[2], &date[3]) == 0) {
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datep = &date[2];
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} else {
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g_assert_not_reached();
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}
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if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
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long t, s;
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start.tm_isdst = datep->tm_isdst;
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t = (long)mktime(datep);
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s = (long)mktime(&start);
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if (t < s) {
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g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
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} else {
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g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
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}
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g_assert_cmpint(ABS(t - s), <=, wiggle);
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}
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}
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static int wiggle = 2;
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static void bcd_check_time(void)
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{
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/* Set BCD mode */
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cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & ~REG_B_DM);
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check_time(wiggle);
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}
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static void dec_check_time(void)
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{
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/* Set DEC mode */
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cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
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check_time(wiggle);
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}
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static void set_alarm_time(struct tm *tm)
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{
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int sec;
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sec = tm->tm_sec;
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if ((cmos_read(RTC_REG_B) & REG_B_DM) == 0) {
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sec = dec2bcd(sec);
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}
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cmos_write(RTC_SECONDS_ALARM, sec);
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cmos_write(RTC_MINUTES_ALARM, RTC_ALARM_DONT_CARE);
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cmos_write(RTC_HOURS_ALARM, RTC_ALARM_DONT_CARE);
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}
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static void alarm_time(void)
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{
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struct tm now;
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time_t ts;
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int i;
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ts = time(NULL);
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gmtime_r(&ts, &now);
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/* set DEC mode */
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cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_DM);
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g_assert(!get_irq(RTC_ISA_IRQ));
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cmos_read(RTC_REG_C);
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now.tm_sec = (now.tm_sec + 2) % 60;
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set_alarm_time(&now);
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cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_AIE);
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for (i = 0; i < 2 + wiggle; i++) {
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if (get_irq(RTC_ISA_IRQ)) {
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break;
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}
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clock_step(1000000000);
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}
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g_assert(get_irq(RTC_ISA_IRQ));
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g_assert((cmos_read(RTC_REG_C) & REG_C_AF) != 0);
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g_assert(cmos_read(RTC_REG_C) == 0);
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}
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/* success if no crash or abort */
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static void fuzz_registers(void)
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{
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unsigned int i;
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for (i = 0; i < 1000; i++) {
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uint8_t reg, val;
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reg = (uint8_t)g_test_rand_int_range(0, 16);
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val = (uint8_t)g_test_rand_int_range(0, 256);
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cmos_write(reg, val);
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cmos_read(reg);
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}
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}
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int main(int argc, char **argv)
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{
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QTestState *s = NULL;
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int ret;
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g_test_init(&argc, &argv, NULL);
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s = qtest_start("-display none -rtc clock=vm");
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qtest_irq_intercept_in(s, "ioapic");
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qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
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qtest_add_func("/rtc/dec/check-time", dec_check_time);
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qtest_add_func("/rtc/alarm-time", alarm_time);
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qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
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ret = g_test_run();
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if (s) {
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qtest_quit(s);
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}
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return ret;
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}
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