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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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