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Commit | Line | Data |
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80cabfad FB |
1 | /* |
2 | * QEMU MC146818 RTC emulation | |
5fafdf24 | 3 | * |
80cabfad | 4 | * Copyright (c) 2003-2004 Fabrice Bellard |
5fafdf24 | 5 | * |
80cabfad FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
e688df6b | 24 | |
b6a0aa05 | 25 | #include "qemu/osdep.h" |
a8d25326 | 26 | #include "qemu-common.h" |
f348b6d1 | 27 | #include "qemu/cutils.h" |
0b8fa32f | 28 | #include "qemu/module.h" |
f348b6d1 | 29 | #include "qemu/bcd.h" |
64552b6b | 30 | #include "hw/irq.h" |
a27bd6c7 | 31 | #include "hw/qdev-properties.h" |
1de7afc9 | 32 | #include "qemu/timer.h" |
9c17d615 | 33 | #include "sysemu/sysemu.h" |
1dfb1b2d | 34 | #include "sysemu/replay.h" |
71e8a915 | 35 | #include "sysemu/reset.h" |
0d09e41a | 36 | #include "hw/timer/mc146818rtc.h" |
d6454270 | 37 | #include "migration/vmstate.h" |
e688df6b | 38 | #include "qapi/error.h" |
b0227cdb MA |
39 | #include "qapi/qapi-commands-misc-target.h" |
40 | #include "qapi/qapi-events-misc-target.h" | |
7b1b5d19 | 41 | #include "qapi/visitor.h" |
f98167ea | 42 | #include "exec/address-spaces.h" |
80cabfad | 43 | |
d362e757 | 44 | #ifdef TARGET_I386 |
0d09e41a | 45 | #include "hw/i386/apic.h" |
d362e757 JK |
46 | #endif |
47 | ||
80cabfad | 48 | //#define DEBUG_CMOS |
aa6f63ff | 49 | //#define DEBUG_COALESCED |
80cabfad | 50 | |
ec51e364 IY |
51 | #ifdef DEBUG_CMOS |
52 | # define CMOS_DPRINTF(format, ...) printf(format, ## __VA_ARGS__) | |
53 | #else | |
54 | # define CMOS_DPRINTF(format, ...) do { } while (0) | |
55 | #endif | |
56 | ||
aa6f63ff BS |
57 | #ifdef DEBUG_COALESCED |
58 | # define DPRINTF_C(format, ...) printf(format, ## __VA_ARGS__) | |
59 | #else | |
60 | # define DPRINTF_C(format, ...) do { } while (0) | |
61 | #endif | |
62 | ||
00cf5774 PB |
63 | #define SEC_PER_MIN 60 |
64 | #define MIN_PER_HOUR 60 | |
65 | #define SEC_PER_HOUR 3600 | |
66 | #define HOUR_PER_DAY 24 | |
67 | #define SEC_PER_DAY 86400 | |
56038ef6 | 68 | |
dd17765b | 69 | #define RTC_REINJECT_ON_ACK_COUNT 20 |
e46deaba | 70 | #define RTC_CLOCK_RATE 32768 |
13566fe3 | 71 | #define UIP_HOLD_LENGTH (8 * NANOSECONDS_PER_SECOND / 32768) |
ba32edab | 72 | |
0e41271e AF |
73 | #define MC146818_RTC(obj) OBJECT_CHECK(RTCState, (obj), TYPE_MC146818_RTC) |
74 | ||
1d914fa0 | 75 | typedef struct RTCState { |
0e41271e AF |
76 | ISADevice parent_obj; |
77 | ||
b2c5009b | 78 | MemoryRegion io; |
f98167ea | 79 | MemoryRegion coalesced_io; |
dff38e7b FB |
80 | uint8_t cmos_data[128]; |
81 | uint8_t cmos_index; | |
32e0c826 | 82 | int32_t base_year; |
56038ef6 YZ |
83 | uint64_t base_rtc; |
84 | uint64_t last_update; | |
85 | int64_t offset; | |
d537cf6c | 86 | qemu_irq irq; |
18c6e2ff | 87 | int it_shift; |
dff38e7b FB |
88 | /* periodic timer */ |
89 | QEMUTimer *periodic_timer; | |
90 | int64_t next_periodic_time; | |
56038ef6 YZ |
91 | /* update-ended timer */ |
92 | QEMUTimer *update_timer; | |
00cf5774 | 93 | uint64_t next_alarm_time; |
ba32edab | 94 | uint16_t irq_reinject_on_ack_count; |
73822ec8 AL |
95 | uint32_t irq_coalesced; |
96 | uint32_t period; | |
93b66569 | 97 | QEMUTimer *coalesced_timer; |
17604dac | 98 | Notifier clock_reset_notifier; |
433acf0d | 99 | LostTickPolicy lost_tick_policy; |
da98c8eb | 100 | Notifier suspend_notifier; |
f2ae8abf | 101 | QLIST_ENTRY(RTCState) link; |
1d914fa0 | 102 | } RTCState; |
dff38e7b FB |
103 | |
104 | static void rtc_set_time(RTCState *s); | |
56038ef6 | 105 | static void rtc_update_time(RTCState *s); |
e2826cf4 | 106 | static void rtc_set_cmos(RTCState *s, const struct tm *tm); |
56038ef6 | 107 | static inline int rtc_from_bcd(RTCState *s, int a); |
00cf5774 | 108 | static uint64_t get_next_alarm(RTCState *s); |
56038ef6 | 109 | |
41a9b8b2 YZ |
110 | static inline bool rtc_running(RTCState *s) |
111 | { | |
112 | return (!(s->cmos_data[RTC_REG_B] & REG_B_SET) && | |
113 | (s->cmos_data[RTC_REG_A] & 0x70) <= 0x20); | |
114 | } | |
115 | ||
56038ef6 YZ |
116 | static uint64_t get_guest_rtc_ns(RTCState *s) |
117 | { | |
884f17c2 | 118 | uint64_t guest_clock = qemu_clock_get_ns(rtc_clock); |
56038ef6 | 119 | |
9be38598 | 120 | return s->base_rtc * NANOSECONDS_PER_SECOND + |
73bcb24d | 121 | guest_clock - s->last_update + s->offset; |
56038ef6 | 122 | } |
dff38e7b | 123 | |
93b66569 AL |
124 | static void rtc_coalesced_timer_update(RTCState *s) |
125 | { | |
126 | if (s->irq_coalesced == 0) { | |
bc72ad67 | 127 | timer_del(s->coalesced_timer); |
93b66569 AL |
128 | } else { |
129 | /* divide each RTC interval to 2 - 8 smaller intervals */ | |
7cd9681b | 130 | int c = MIN(s->irq_coalesced, 7) + 1; |
884f17c2 | 131 | int64_t next_clock = qemu_clock_get_ns(rtc_clock) + |
bd618eab | 132 | periodic_clock_to_ns(s->period / c); |
bc72ad67 | 133 | timer_mod(s->coalesced_timer, next_clock); |
93b66569 AL |
134 | } |
135 | } | |
136 | ||
e0c8b950 XG |
137 | static QLIST_HEAD(, RTCState) rtc_devices = |
138 | QLIST_HEAD_INITIALIZER(rtc_devices); | |
139 | ||
388ad5d2 | 140 | #ifdef TARGET_I386 |
e0c8b950 XG |
141 | void qmp_rtc_reset_reinjection(Error **errp) |
142 | { | |
143 | RTCState *s; | |
144 | ||
145 | QLIST_FOREACH(s, &rtc_devices, link) { | |
146 | s->irq_coalesced = 0; | |
147 | } | |
148 | } | |
149 | ||
150 | static bool rtc_policy_slew_deliver_irq(RTCState *s) | |
151 | { | |
152 | apic_reset_irq_delivered(); | |
153 | qemu_irq_raise(s->irq); | |
154 | return apic_get_irq_delivered(); | |
155 | } | |
156 | ||
93b66569 AL |
157 | static void rtc_coalesced_timer(void *opaque) |
158 | { | |
159 | RTCState *s = opaque; | |
160 | ||
161 | if (s->irq_coalesced != 0) { | |
93b66569 | 162 | s->cmos_data[RTC_REG_C] |= 0xc0; |
aa6f63ff | 163 | DPRINTF_C("cmos: injecting from timer\n"); |
e0c8b950 | 164 | if (rtc_policy_slew_deliver_irq(s)) { |
93b66569 | 165 | s->irq_coalesced--; |
aa6f63ff BS |
166 | DPRINTF_C("cmos: coalesced irqs decreased to %d\n", |
167 | s->irq_coalesced); | |
93b66569 AL |
168 | } |
169 | } | |
170 | ||
171 | rtc_coalesced_timer_update(s); | |
172 | } | |
e0c8b950 XG |
173 | #else |
174 | static bool rtc_policy_slew_deliver_irq(RTCState *s) | |
175 | { | |
176 | assert(0); | |
177 | return false; | |
178 | } | |
93b66569 AL |
179 | #endif |
180 | ||
369b4135 | 181 | static uint32_t rtc_periodic_clock_ticks(RTCState *s) |
dff38e7b | 182 | { |
369b4135 TY |
183 | int period_code; |
184 | ||
185 | if (!(s->cmos_data[RTC_REG_B] & REG_B_PIE)) { | |
186 | return 0; | |
187 | } | |
dff38e7b FB |
188 | |
189 | period_code = s->cmos_data[RTC_REG_A] & 0x0f; | |
369b4135 | 190 | |
bd618eab | 191 | return periodic_period_to_clock(period_code); |
369b4135 TY |
192 | } |
193 | ||
194 | /* | |
195 | * handle periodic timer. @old_period indicates the periodic timer update | |
196 | * is just due to period adjustment. | |
197 | */ | |
198 | static void | |
199 | periodic_timer_update(RTCState *s, int64_t current_time, uint32_t old_period) | |
200 | { | |
201 | uint32_t period; | |
202 | int64_t cur_clock, next_irq_clock, lost_clock = 0; | |
203 | ||
204 | period = rtc_periodic_clock_ticks(s); | |
205 | ||
206 | if (period) { | |
dff38e7b | 207 | /* compute 32 khz clock */ |
73bcb24d RS |
208 | cur_clock = |
209 | muldiv64(current_time, RTC_CLOCK_RATE, NANOSECONDS_PER_SECOND); | |
210 | ||
369b4135 TY |
211 | /* |
212 | * if the periodic timer's update is due to period re-configuration, | |
213 | * we should count the clock since last interrupt. | |
214 | */ | |
215 | if (old_period) { | |
216 | int64_t last_periodic_clock, next_periodic_clock; | |
217 | ||
218 | next_periodic_clock = muldiv64(s->next_periodic_time, | |
219 | RTC_CLOCK_RATE, NANOSECONDS_PER_SECOND); | |
220 | last_periodic_clock = next_periodic_clock - old_period; | |
221 | lost_clock = cur_clock - last_periodic_clock; | |
222 | assert(lost_clock >= 0); | |
223 | } | |
224 | ||
369b4135 TY |
225 | /* |
226 | * s->irq_coalesced can change for two reasons: | |
227 | * | |
228 | * a) if one or more periodic timer interrupts have been lost, | |
229 | * lost_clock will be more that a period. | |
230 | * | |
231 | * b) when the period may be reconfigured, we expect the OS to | |
232 | * treat delayed tick as the new period. So, when switching | |
233 | * from a shorter to a longer period, scale down the missing, | |
234 | * because the OS will treat past delayed ticks as longer | |
235 | * (leftovers are put back into lost_clock). When switching | |
236 | * to a shorter period, scale up the missing ticks since the | |
237 | * OS handler will treat past delayed ticks as shorter. | |
238 | */ | |
239 | if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) { | |
240 | uint32_t old_irq_coalesced = s->irq_coalesced; | |
241 | ||
242 | s->period = period; | |
243 | lost_clock += old_irq_coalesced * old_period; | |
244 | s->irq_coalesced = lost_clock / s->period; | |
245 | lost_clock %= s->period; | |
246 | if (old_irq_coalesced != s->irq_coalesced || | |
247 | old_period != s->period) { | |
248 | DPRINTF_C("cmos: coalesced irqs scaled from %d to %d, " | |
249 | "period scaled from %d to %d\n", old_irq_coalesced, | |
250 | s->irq_coalesced, old_period, s->period); | |
251 | rtc_coalesced_timer_update(s); | |
252 | } | |
388ad5d2 | 253 | } else { |
369b4135 TY |
254 | /* |
255 | * no way to compensate the interrupt if LOST_TICK_POLICY_SLEW | |
256 | * is not used, we should make the time progress anyway. | |
257 | */ | |
258 | lost_clock = MIN(lost_clock, period); | |
259 | } | |
260 | ||
261 | assert(lost_clock >= 0 && lost_clock <= period); | |
262 | ||
263 | next_irq_clock = cur_clock + period - lost_clock; | |
bd618eab | 264 | s->next_periodic_time = periodic_clock_to_ns(next_irq_clock) + 1; |
bc72ad67 | 265 | timer_mod(s->periodic_timer, s->next_periodic_time); |
dff38e7b | 266 | } else { |
73822ec8 | 267 | s->irq_coalesced = 0; |
bc72ad67 | 268 | timer_del(s->periodic_timer); |
dff38e7b FB |
269 | } |
270 | } | |
271 | ||
272 | static void rtc_periodic_timer(void *opaque) | |
273 | { | |
274 | RTCState *s = opaque; | |
275 | ||
369b4135 | 276 | periodic_timer_update(s, s->next_periodic_time, 0); |
663447d4 | 277 | s->cmos_data[RTC_REG_C] |= REG_C_PF; |
100d9891 | 278 | if (s->cmos_data[RTC_REG_B] & REG_B_PIE) { |
663447d4 | 279 | s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
104059da | 280 | if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) { |
ba32edab | 281 | if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT) |
e0c8b950 XG |
282 | s->irq_reinject_on_ack_count = 0; |
283 | if (!rtc_policy_slew_deliver_irq(s)) { | |
93b66569 AL |
284 | s->irq_coalesced++; |
285 | rtc_coalesced_timer_update(s); | |
aa6f63ff BS |
286 | DPRINTF_C("cmos: coalesced irqs increased to %d\n", |
287 | s->irq_coalesced); | |
93b66569 AL |
288 | } |
289 | } else | |
e0c8b950 | 290 | qemu_irq_raise(s->irq); |
100d9891 | 291 | } |
dff38e7b | 292 | } |
80cabfad | 293 | |
56038ef6 YZ |
294 | /* handle update-ended timer */ |
295 | static void check_update_timer(RTCState *s) | |
296 | { | |
297 | uint64_t next_update_time; | |
298 | uint64_t guest_nsec; | |
00cf5774 | 299 | int next_alarm_sec; |
56038ef6 | 300 | |
41a9b8b2 YZ |
301 | /* From the data sheet: "Holding the dividers in reset prevents |
302 | * interrupts from operating, while setting the SET bit allows" | |
6a51d83a | 303 | * them to occur. |
56038ef6 | 304 | */ |
41a9b8b2 | 305 | if ((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) { |
33f21e4f | 306 | assert((s->cmos_data[RTC_REG_A] & REG_A_UIP) == 0); |
bc72ad67 | 307 | timer_del(s->update_timer); |
41a9b8b2 YZ |
308 | return; |
309 | } | |
56038ef6 | 310 | |
13566fe3 | 311 | guest_nsec = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND; |
884f17c2 | 312 | next_update_time = qemu_clock_get_ns(rtc_clock) |
13566fe3 | 313 | + NANOSECONDS_PER_SECOND - guest_nsec; |
00cf5774 PB |
314 | |
315 | /* Compute time of next alarm. One second is already accounted | |
316 | * for in next_update_time. | |
317 | */ | |
318 | next_alarm_sec = get_next_alarm(s); | |
13566fe3 SH |
319 | s->next_alarm_time = next_update_time + |
320 | (next_alarm_sec - 1) * NANOSECONDS_PER_SECOND; | |
00cf5774 | 321 | |
33f21e4f PB |
322 | /* If update_in_progress latched the UIP bit, we must keep the timer |
323 | * programmed to the next second, so that UIP is cleared. Otherwise, | |
324 | * if UF is already set, we might be able to optimize. | |
325 | */ | |
326 | if (!(s->cmos_data[RTC_REG_A] & REG_A_UIP) && | |
327 | (s->cmos_data[RTC_REG_C] & REG_C_UF)) { | |
6a51d83a PB |
328 | /* If AF cannot change (i.e. either it is set already, or |
329 | * SET=1 and then the time is not updated), nothing to do. | |
330 | */ | |
331 | if ((s->cmos_data[RTC_REG_B] & REG_B_SET) || | |
332 | (s->cmos_data[RTC_REG_C] & REG_C_AF)) { | |
333 | timer_del(s->update_timer); | |
334 | return; | |
335 | } | |
336 | ||
00cf5774 PB |
337 | /* UF is set, but AF is clear. Program the timer to target |
338 | * the alarm time. */ | |
339 | next_update_time = s->next_alarm_time; | |
340 | } | |
e93379b0 | 341 | if (next_update_time != timer_expire_time_ns(s->update_timer)) { |
bc72ad67 | 342 | timer_mod(s->update_timer, next_update_time); |
56038ef6 YZ |
343 | } |
344 | } | |
345 | ||
346 | static inline uint8_t convert_hour(RTCState *s, uint8_t hour) | |
347 | { | |
348 | if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) { | |
349 | hour %= 12; | |
350 | if (s->cmos_data[RTC_HOURS] & 0x80) { | |
351 | hour += 12; | |
352 | } | |
353 | } | |
354 | return hour; | |
355 | } | |
356 | ||
00cf5774 | 357 | static uint64_t get_next_alarm(RTCState *s) |
56038ef6 | 358 | { |
00cf5774 PB |
359 | int32_t alarm_sec, alarm_min, alarm_hour, cur_hour, cur_min, cur_sec; |
360 | int32_t hour, min, sec; | |
361 | ||
362 | rtc_update_time(s); | |
56038ef6 YZ |
363 | |
364 | alarm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]); | |
365 | alarm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]); | |
366 | alarm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]); | |
00cf5774 | 367 | alarm_hour = alarm_hour == -1 ? -1 : convert_hour(s, alarm_hour); |
56038ef6 YZ |
368 | |
369 | cur_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); | |
370 | cur_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); | |
371 | cur_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS]); | |
372 | cur_hour = convert_hour(s, cur_hour); | |
373 | ||
00cf5774 PB |
374 | if (alarm_hour == -1) { |
375 | alarm_hour = cur_hour; | |
376 | if (alarm_min == -1) { | |
377 | alarm_min = cur_min; | |
378 | if (alarm_sec == -1) { | |
379 | alarm_sec = cur_sec + 1; | |
380 | } else if (cur_sec > alarm_sec) { | |
381 | alarm_min++; | |
382 | } | |
383 | } else if (cur_min == alarm_min) { | |
384 | if (alarm_sec == -1) { | |
385 | alarm_sec = cur_sec + 1; | |
386 | } else { | |
387 | if (cur_sec > alarm_sec) { | |
388 | alarm_hour++; | |
389 | } | |
390 | } | |
391 | if (alarm_sec == SEC_PER_MIN) { | |
392 | /* wrap to next hour, minutes is not in don't care mode */ | |
393 | alarm_sec = 0; | |
394 | alarm_hour++; | |
395 | } | |
396 | } else if (cur_min > alarm_min) { | |
397 | alarm_hour++; | |
398 | } | |
399 | } else if (cur_hour == alarm_hour) { | |
400 | if (alarm_min == -1) { | |
401 | alarm_min = cur_min; | |
402 | if (alarm_sec == -1) { | |
403 | alarm_sec = cur_sec + 1; | |
404 | } else if (cur_sec > alarm_sec) { | |
405 | alarm_min++; | |
406 | } | |
407 | ||
408 | if (alarm_sec == SEC_PER_MIN) { | |
409 | alarm_sec = 0; | |
410 | alarm_min++; | |
411 | } | |
412 | /* wrap to next day, hour is not in don't care mode */ | |
413 | alarm_min %= MIN_PER_HOUR; | |
414 | } else if (cur_min == alarm_min) { | |
415 | if (alarm_sec == -1) { | |
416 | alarm_sec = cur_sec + 1; | |
417 | } | |
418 | /* wrap to next day, hours+minutes not in don't care mode */ | |
419 | alarm_sec %= SEC_PER_MIN; | |
420 | } | |
56038ef6 | 421 | } |
56038ef6 | 422 | |
00cf5774 PB |
423 | /* values that are still don't care fire at the next min/sec */ |
424 | if (alarm_min == -1) { | |
425 | alarm_min = 0; | |
426 | } | |
427 | if (alarm_sec == -1) { | |
428 | alarm_sec = 0; | |
429 | } | |
430 | ||
431 | /* keep values in range */ | |
432 | if (alarm_sec == SEC_PER_MIN) { | |
433 | alarm_sec = 0; | |
434 | alarm_min++; | |
435 | } | |
436 | if (alarm_min == MIN_PER_HOUR) { | |
437 | alarm_min = 0; | |
438 | alarm_hour++; | |
439 | } | |
440 | alarm_hour %= HOUR_PER_DAY; | |
441 | ||
442 | hour = alarm_hour - cur_hour; | |
443 | min = hour * MIN_PER_HOUR + alarm_min - cur_min; | |
444 | sec = min * SEC_PER_MIN + alarm_sec - cur_sec; | |
445 | return sec <= 0 ? sec + SEC_PER_DAY : sec; | |
56038ef6 YZ |
446 | } |
447 | ||
448 | static void rtc_update_timer(void *opaque) | |
449 | { | |
450 | RTCState *s = opaque; | |
451 | int32_t irqs = REG_C_UF; | |
452 | int32_t new_irqs; | |
453 | ||
41a9b8b2 YZ |
454 | assert((s->cmos_data[RTC_REG_A] & 0x60) != 0x60); |
455 | ||
56038ef6 YZ |
456 | /* UIP might have been latched, update time and clear it. */ |
457 | rtc_update_time(s); | |
458 | s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; | |
459 | ||
884f17c2 | 460 | if (qemu_clock_get_ns(rtc_clock) >= s->next_alarm_time) { |
56038ef6 YZ |
461 | irqs |= REG_C_AF; |
462 | if (s->cmos_data[RTC_REG_B] & REG_B_AIE) { | |
fb064112 | 463 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_RTC, NULL); |
56038ef6 YZ |
464 | } |
465 | } | |
00cf5774 | 466 | |
56038ef6 YZ |
467 | new_irqs = irqs & ~s->cmos_data[RTC_REG_C]; |
468 | s->cmos_data[RTC_REG_C] |= irqs; | |
469 | if ((new_irqs & s->cmos_data[RTC_REG_B]) != 0) { | |
470 | s->cmos_data[RTC_REG_C] |= REG_C_IRQF; | |
471 | qemu_irq_raise(s->irq); | |
472 | } | |
473 | check_update_timer(s); | |
474 | } | |
475 | ||
0da8c842 AG |
476 | static void cmos_ioport_write(void *opaque, hwaddr addr, |
477 | uint64_t data, unsigned size) | |
80cabfad | 478 | { |
b41a2cd1 | 479 | RTCState *s = opaque; |
369b4135 | 480 | uint32_t old_period; |
9a6e2dcf | 481 | bool update_periodic_timer; |
80cabfad FB |
482 | |
483 | if ((addr & 1) == 0) { | |
484 | s->cmos_index = data & 0x7f; | |
485 | } else { | |
c5539cb4 | 486 | CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02" PRIx64 "\n", |
ec51e364 | 487 | s->cmos_index, data); |
dff38e7b | 488 | switch(s->cmos_index) { |
80cabfad FB |
489 | case RTC_SECONDS_ALARM: |
490 | case RTC_MINUTES_ALARM: | |
491 | case RTC_HOURS_ALARM: | |
80cabfad | 492 | s->cmos_data[s->cmos_index] = data; |
56038ef6 | 493 | check_update_timer(s); |
80cabfad | 494 | break; |
7cd9681b | 495 | case RTC_IBM_PS2_CENTURY_BYTE: |
e67edb94 PB |
496 | s->cmos_index = RTC_CENTURY; |
497 | /* fall through */ | |
498 | case RTC_CENTURY: | |
80cabfad FB |
499 | case RTC_SECONDS: |
500 | case RTC_MINUTES: | |
501 | case RTC_HOURS: | |
502 | case RTC_DAY_OF_WEEK: | |
503 | case RTC_DAY_OF_MONTH: | |
504 | case RTC_MONTH: | |
505 | case RTC_YEAR: | |
506 | s->cmos_data[s->cmos_index] = data; | |
dff38e7b | 507 | /* if in set mode, do not update the time */ |
41a9b8b2 | 508 | if (rtc_running(s)) { |
dff38e7b | 509 | rtc_set_time(s); |
56038ef6 | 510 | check_update_timer(s); |
dff38e7b | 511 | } |
80cabfad FB |
512 | break; |
513 | case RTC_REG_A: | |
9a6e2dcf | 514 | update_periodic_timer = (s->cmos_data[RTC_REG_A] ^ data) & 0x0f; |
369b4135 | 515 | old_period = rtc_periodic_clock_ticks(s); |
9a6e2dcf | 516 | |
41a9b8b2 YZ |
517 | if ((data & 0x60) == 0x60) { |
518 | if (rtc_running(s)) { | |
519 | rtc_update_time(s); | |
520 | } | |
521 | /* What happens to UIP when divider reset is enabled is | |
522 | * unclear from the datasheet. Shouldn't matter much | |
523 | * though. | |
524 | */ | |
525 | s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; | |
526 | } else if (((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) && | |
527 | (data & 0x70) <= 0x20) { | |
528 | /* when the divider reset is removed, the first update cycle | |
529 | * begins one-half second later*/ | |
530 | if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) { | |
531 | s->offset = 500000000; | |
532 | rtc_set_time(s); | |
533 | } | |
534 | s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; | |
535 | } | |
dff38e7b FB |
536 | /* UIP bit is read only */ |
537 | s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) | | |
538 | (s->cmos_data[RTC_REG_A] & REG_A_UIP); | |
9a6e2dcf XG |
539 | |
540 | if (update_periodic_timer) { | |
369b4135 TY |
541 | periodic_timer_update(s, qemu_clock_get_ns(rtc_clock), |
542 | old_period); | |
9a6e2dcf XG |
543 | } |
544 | ||
56038ef6 | 545 | check_update_timer(s); |
dff38e7b | 546 | break; |
80cabfad | 547 | case RTC_REG_B: |
9a6e2dcf XG |
548 | update_periodic_timer = (s->cmos_data[RTC_REG_B] ^ data) |
549 | & REG_B_PIE; | |
369b4135 | 550 | old_period = rtc_periodic_clock_ticks(s); |
9a6e2dcf | 551 | |
dff38e7b | 552 | if (data & REG_B_SET) { |
56038ef6 | 553 | /* update cmos to when the rtc was stopping */ |
41a9b8b2 | 554 | if (rtc_running(s)) { |
56038ef6 YZ |
555 | rtc_update_time(s); |
556 | } | |
dff38e7b FB |
557 | /* set mode: reset UIP mode */ |
558 | s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; | |
559 | data &= ~REG_B_UIE; | |
560 | } else { | |
561 | /* if disabling set mode, update the time */ | |
41a9b8b2 YZ |
562 | if ((s->cmos_data[RTC_REG_B] & REG_B_SET) && |
563 | (s->cmos_data[RTC_REG_A] & 0x70) <= 0x20) { | |
13566fe3 | 564 | s->offset = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND; |
dff38e7b FB |
565 | rtc_set_time(s); |
566 | } | |
567 | } | |
9324cc50 YZ |
568 | /* if an interrupt flag is already set when the interrupt |
569 | * becomes enabled, raise an interrupt immediately. */ | |
570 | if (data & s->cmos_data[RTC_REG_C] & REG_C_MASK) { | |
571 | s->cmos_data[RTC_REG_C] |= REG_C_IRQF; | |
572 | qemu_irq_raise(s->irq); | |
573 | } else { | |
574 | s->cmos_data[RTC_REG_C] &= ~REG_C_IRQF; | |
575 | qemu_irq_lower(s->irq); | |
576 | } | |
bedc572e | 577 | s->cmos_data[RTC_REG_B] = data; |
9a6e2dcf XG |
578 | |
579 | if (update_periodic_timer) { | |
369b4135 TY |
580 | periodic_timer_update(s, qemu_clock_get_ns(rtc_clock), |
581 | old_period); | |
9a6e2dcf XG |
582 | } |
583 | ||
56038ef6 | 584 | check_update_timer(s); |
80cabfad FB |
585 | break; |
586 | case RTC_REG_C: | |
587 | case RTC_REG_D: | |
588 | /* cannot write to them */ | |
589 | break; | |
590 | default: | |
591 | s->cmos_data[s->cmos_index] = data; | |
592 | break; | |
593 | } | |
594 | } | |
595 | } | |
596 | ||
abd0c6bd | 597 | static inline int rtc_to_bcd(RTCState *s, int a) |
80cabfad | 598 | { |
6f1bf24d | 599 | if (s->cmos_data[RTC_REG_B] & REG_B_DM) { |
dff38e7b FB |
600 | return a; |
601 | } else { | |
602 | return ((a / 10) << 4) | (a % 10); | |
603 | } | |
80cabfad FB |
604 | } |
605 | ||
abd0c6bd | 606 | static inline int rtc_from_bcd(RTCState *s, int a) |
80cabfad | 607 | { |
00cf5774 PB |
608 | if ((a & 0xc0) == 0xc0) { |
609 | return -1; | |
610 | } | |
6f1bf24d | 611 | if (s->cmos_data[RTC_REG_B] & REG_B_DM) { |
dff38e7b FB |
612 | return a; |
613 | } else { | |
614 | return ((a >> 4) * 10) + (a & 0x0f); | |
615 | } | |
616 | } | |
617 | ||
e2826cf4 | 618 | static void rtc_get_time(RTCState *s, struct tm *tm) |
dff38e7b | 619 | { |
abd0c6bd PB |
620 | tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); |
621 | tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); | |
622 | tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f); | |
3b89eb43 PB |
623 | if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) { |
624 | tm->tm_hour %= 12; | |
625 | if (s->cmos_data[RTC_HOURS] & 0x80) { | |
626 | tm->tm_hour += 12; | |
627 | } | |
43f493af | 628 | } |
abd0c6bd PB |
629 | tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1; |
630 | tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]); | |
631 | tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1; | |
b8994faf PB |
632 | tm->tm_year = |
633 | rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year + | |
634 | rtc_from_bcd(s, s->cmos_data[RTC_CENTURY]) * 100 - 1900; | |
e2826cf4 PB |
635 | } |
636 | ||
637 | static void rtc_set_time(RTCState *s) | |
638 | { | |
639 | struct tm tm; | |
80cd3478 | 640 | |
e2826cf4 | 641 | rtc_get_time(s, &tm); |
e2826cf4 | 642 | s->base_rtc = mktimegm(&tm); |
884f17c2 | 643 | s->last_update = qemu_clock_get_ns(rtc_clock); |
56038ef6 | 644 | |
3ab72385 | 645 | qapi_event_send_rtc_change(qemu_timedate_diff(&tm)); |
43f493af FB |
646 | } |
647 | ||
e2826cf4 | 648 | static void rtc_set_cmos(RTCState *s, const struct tm *tm) |
43f493af | 649 | { |
42fc73a1 | 650 | int year; |
dff38e7b | 651 | |
abd0c6bd PB |
652 | s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec); |
653 | s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min); | |
c29cd656 | 654 | if (s->cmos_data[RTC_REG_B] & REG_B_24H) { |
43f493af | 655 | /* 24 hour format */ |
abd0c6bd | 656 | s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour); |
43f493af FB |
657 | } else { |
658 | /* 12 hour format */ | |
3b89eb43 PB |
659 | int h = (tm->tm_hour % 12) ? tm->tm_hour % 12 : 12; |
660 | s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, h); | |
43f493af FB |
661 | if (tm->tm_hour >= 12) |
662 | s->cmos_data[RTC_HOURS] |= 0x80; | |
663 | } | |
abd0c6bd PB |
664 | s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1); |
665 | s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday); | |
666 | s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1); | |
b8994faf PB |
667 | year = tm->tm_year + 1900 - s->base_year; |
668 | s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year % 100); | |
669 | s->cmos_data[RTC_CENTURY] = rtc_to_bcd(s, year / 100); | |
43f493af FB |
670 | } |
671 | ||
56038ef6 | 672 | static void rtc_update_time(RTCState *s) |
43f493af | 673 | { |
56038ef6 YZ |
674 | struct tm ret; |
675 | time_t guest_sec; | |
676 | int64_t guest_nsec; | |
677 | ||
678 | guest_nsec = get_guest_rtc_ns(s); | |
13566fe3 | 679 | guest_sec = guest_nsec / NANOSECONDS_PER_SECOND; |
56038ef6 | 680 | gmtime_r(&guest_sec, &ret); |
02c6ccc6 AH |
681 | |
682 | /* Is SET flag of Register B disabled? */ | |
683 | if ((s->cmos_data[RTC_REG_B] & REG_B_SET) == 0) { | |
684 | rtc_set_cmos(s, &ret); | |
685 | } | |
43f493af FB |
686 | } |
687 | ||
56038ef6 | 688 | static int update_in_progress(RTCState *s) |
43f493af | 689 | { |
56038ef6 | 690 | int64_t guest_nsec; |
3b46e624 | 691 | |
41a9b8b2 | 692 | if (!rtc_running(s)) { |
56038ef6 | 693 | return 0; |
dff38e7b | 694 | } |
e93379b0 AB |
695 | if (timer_pending(s->update_timer)) { |
696 | int64_t next_update_time = timer_expire_time_ns(s->update_timer); | |
56038ef6 | 697 | /* Latch UIP until the timer expires. */ |
884f17c2 AB |
698 | if (qemu_clock_get_ns(rtc_clock) >= |
699 | (next_update_time - UIP_HOLD_LENGTH)) { | |
56038ef6 YZ |
700 | s->cmos_data[RTC_REG_A] |= REG_A_UIP; |
701 | return 1; | |
dff38e7b FB |
702 | } |
703 | } | |
704 | ||
56038ef6 YZ |
705 | guest_nsec = get_guest_rtc_ns(s); |
706 | /* UIP bit will be set at last 244us of every second. */ | |
13566fe3 SH |
707 | if ((guest_nsec % NANOSECONDS_PER_SECOND) >= |
708 | (NANOSECONDS_PER_SECOND - UIP_HOLD_LENGTH)) { | |
56038ef6 | 709 | return 1; |
dff38e7b | 710 | } |
56038ef6 | 711 | return 0; |
80cabfad FB |
712 | } |
713 | ||
0da8c842 AG |
714 | static uint64_t cmos_ioport_read(void *opaque, hwaddr addr, |
715 | unsigned size) | |
80cabfad | 716 | { |
b41a2cd1 | 717 | RTCState *s = opaque; |
80cabfad FB |
718 | int ret; |
719 | if ((addr & 1) == 0) { | |
720 | return 0xff; | |
721 | } else { | |
722 | switch(s->cmos_index) { | |
7cd9681b | 723 | case RTC_IBM_PS2_CENTURY_BYTE: |
e67edb94 PB |
724 | s->cmos_index = RTC_CENTURY; |
725 | /* fall through */ | |
726 | case RTC_CENTURY: | |
80cabfad FB |
727 | case RTC_SECONDS: |
728 | case RTC_MINUTES: | |
729 | case RTC_HOURS: | |
730 | case RTC_DAY_OF_WEEK: | |
731 | case RTC_DAY_OF_MONTH: | |
732 | case RTC_MONTH: | |
733 | case RTC_YEAR: | |
56038ef6 YZ |
734 | /* if not in set mode, calibrate cmos before |
735 | * reading*/ | |
41a9b8b2 | 736 | if (rtc_running(s)) { |
56038ef6 YZ |
737 | rtc_update_time(s); |
738 | } | |
80cabfad FB |
739 | ret = s->cmos_data[s->cmos_index]; |
740 | break; | |
741 | case RTC_REG_A: | |
33f21e4f | 742 | ret = s->cmos_data[s->cmos_index]; |
56038ef6 | 743 | if (update_in_progress(s)) { |
33f21e4f | 744 | ret |= REG_A_UIP; |
56038ef6 | 745 | } |
80cabfad FB |
746 | break; |
747 | case RTC_REG_C: | |
748 | ret = s->cmos_data[s->cmos_index]; | |
d537cf6c | 749 | qemu_irq_lower(s->irq); |
fbc15e27 | 750 | s->cmos_data[RTC_REG_C] = 0x00; |
56038ef6 YZ |
751 | if (ret & (REG_C_UF | REG_C_AF)) { |
752 | check_update_timer(s); | |
753 | } | |
e0c8b950 | 754 | |
ba32edab | 755 | if(s->irq_coalesced && |
fbc15e27 | 756 | (s->cmos_data[RTC_REG_B] & REG_B_PIE) && |
ba32edab GN |
757 | s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) { |
758 | s->irq_reinject_on_ack_count++; | |
fbc15e27 | 759 | s->cmos_data[RTC_REG_C] |= REG_C_IRQF | REG_C_PF; |
aa6f63ff | 760 | DPRINTF_C("cmos: injecting on ack\n"); |
e0c8b950 | 761 | if (rtc_policy_slew_deliver_irq(s)) { |
ba32edab | 762 | s->irq_coalesced--; |
aa6f63ff BS |
763 | DPRINTF_C("cmos: coalesced irqs decreased to %d\n", |
764 | s->irq_coalesced); | |
765 | } | |
ba32edab | 766 | } |
80cabfad FB |
767 | break; |
768 | default: | |
769 | ret = s->cmos_data[s->cmos_index]; | |
770 | break; | |
771 | } | |
ec51e364 IY |
772 | CMOS_DPRINTF("cmos: read index=0x%02x val=0x%02x\n", |
773 | s->cmos_index, ret); | |
80cabfad FB |
774 | return ret; |
775 | } | |
776 | } | |
777 | ||
1d914fa0 | 778 | void rtc_set_memory(ISADevice *dev, int addr, int val) |
dff38e7b | 779 | { |
0e41271e | 780 | RTCState *s = MC146818_RTC(dev); |
dff38e7b FB |
781 | if (addr >= 0 && addr <= 127) |
782 | s->cmos_data[addr] = val; | |
783 | } | |
784 | ||
b8b7456d IM |
785 | int rtc_get_memory(ISADevice *dev, int addr) |
786 | { | |
787 | RTCState *s = MC146818_RTC(dev); | |
788 | assert(addr >= 0 && addr <= 127); | |
789 | return s->cmos_data[addr]; | |
790 | } | |
791 | ||
1d914fa0 | 792 | static void rtc_set_date_from_host(ISADevice *dev) |
ea55ffb3 | 793 | { |
0e41271e | 794 | RTCState *s = MC146818_RTC(dev); |
f6503059 | 795 | struct tm tm; |
ea55ffb3 | 796 | |
f6503059 | 797 | qemu_get_timedate(&tm, 0); |
56038ef6 YZ |
798 | |
799 | s->base_rtc = mktimegm(&tm); | |
884f17c2 | 800 | s->last_update = qemu_clock_get_ns(rtc_clock); |
56038ef6 YZ |
801 | s->offset = 0; |
802 | ||
803 | /* set the CMOS date */ | |
e2826cf4 | 804 | rtc_set_cmos(s, &tm); |
ea55ffb3 TS |
805 | } |
806 | ||
44b1ff31 | 807 | static int rtc_pre_save(void *opaque) |
3cf294ee JB |
808 | { |
809 | RTCState *s = opaque; | |
810 | ||
811 | rtc_update_time(s); | |
44b1ff31 DDAG |
812 | |
813 | return 0; | |
3cf294ee JB |
814 | } |
815 | ||
6b075b8a | 816 | static int rtc_post_load(void *opaque, int version_id) |
80cabfad | 817 | { |
dff38e7b FB |
818 | RTCState *s = opaque; |
819 | ||
3cf294ee | 820 | if (version_id <= 2 || rtc_clock == QEMU_CLOCK_REALTIME) { |
56038ef6 YZ |
821 | rtc_set_time(s); |
822 | s->offset = 0; | |
823 | check_update_timer(s); | |
824 | } | |
825 | ||
1dfb1b2d PD |
826 | /* The periodic timer is deterministic in record/replay mode, |
827 | * so there is no need to update it after loading the vmstate. | |
828 | * Reading RTC here would misalign record and replay. | |
829 | */ | |
830 | if (replay_mode == REPLAY_MODE_NONE) { | |
831 | uint64_t now = qemu_clock_get_ns(rtc_clock); | |
832 | if (now < s->next_periodic_time || | |
833 | now > (s->next_periodic_time + get_max_clock_jump())) { | |
369b4135 | 834 | periodic_timer_update(s, qemu_clock_get_ns(rtc_clock), 0); |
1dfb1b2d | 835 | } |
ae46e239 PD |
836 | } |
837 | ||
048c74c4 | 838 | if (version_id >= 2) { |
104059da | 839 | if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) { |
048c74c4 JQ |
840 | rtc_coalesced_timer_update(s); |
841 | } | |
048c74c4 | 842 | } |
73822ec8 AL |
843 | return 0; |
844 | } | |
73822ec8 | 845 | |
5cd8cada JQ |
846 | static bool rtc_irq_reinject_on_ack_count_needed(void *opaque) |
847 | { | |
848 | RTCState *s = (RTCState *)opaque; | |
849 | return s->irq_reinject_on_ack_count != 0; | |
850 | } | |
851 | ||
0b102153 | 852 | static const VMStateDescription vmstate_rtc_irq_reinject_on_ack_count = { |
bb426311 | 853 | .name = "mc146818rtc/irq_reinject_on_ack_count", |
0b102153 PD |
854 | .version_id = 1, |
855 | .minimum_version_id = 1, | |
5cd8cada | 856 | .needed = rtc_irq_reinject_on_ack_count_needed, |
0b102153 PD |
857 | .fields = (VMStateField[]) { |
858 | VMSTATE_UINT16(irq_reinject_on_ack_count, RTCState), | |
859 | VMSTATE_END_OF_LIST() | |
860 | } | |
861 | }; | |
862 | ||
6b075b8a JQ |
863 | static const VMStateDescription vmstate_rtc = { |
864 | .name = "mc146818rtc", | |
56038ef6 | 865 | .version_id = 3, |
6b075b8a | 866 | .minimum_version_id = 1, |
3cf294ee | 867 | .pre_save = rtc_pre_save, |
6b075b8a | 868 | .post_load = rtc_post_load, |
d49805ae | 869 | .fields = (VMStateField[]) { |
6b075b8a JQ |
870 | VMSTATE_BUFFER(cmos_data, RTCState), |
871 | VMSTATE_UINT8(cmos_index, RTCState), | |
89166459 | 872 | VMSTATE_UNUSED(7*4), |
e720677e | 873 | VMSTATE_TIMER_PTR(periodic_timer, RTCState), |
6b075b8a | 874 | VMSTATE_INT64(next_periodic_time, RTCState), |
56038ef6 | 875 | VMSTATE_UNUSED(3*8), |
6b075b8a JQ |
876 | VMSTATE_UINT32_V(irq_coalesced, RTCState, 2), |
877 | VMSTATE_UINT32_V(period, RTCState, 2), | |
56038ef6 YZ |
878 | VMSTATE_UINT64_V(base_rtc, RTCState, 3), |
879 | VMSTATE_UINT64_V(last_update, RTCState, 3), | |
880 | VMSTATE_INT64_V(offset, RTCState, 3), | |
e720677e | 881 | VMSTATE_TIMER_PTR_V(update_timer, RTCState, 3), |
00cf5774 | 882 | VMSTATE_UINT64_V(next_alarm_time, RTCState, 3), |
6b075b8a | 883 | VMSTATE_END_OF_LIST() |
0b102153 | 884 | }, |
5cd8cada JQ |
885 | .subsections = (const VMStateDescription*[]) { |
886 | &vmstate_rtc_irq_reinject_on_ack_count, | |
887 | NULL | |
6b075b8a JQ |
888 | } |
889 | }; | |
890 | ||
17604dac JK |
891 | static void rtc_notify_clock_reset(Notifier *notifier, void *data) |
892 | { | |
893 | RTCState *s = container_of(notifier, RTCState, clock_reset_notifier); | |
894 | int64_t now = *(int64_t *)data; | |
895 | ||
0e41271e | 896 | rtc_set_date_from_host(ISA_DEVICE(s)); |
369b4135 | 897 | periodic_timer_update(s, now, 0); |
56038ef6 | 898 | check_update_timer(s); |
388ad5d2 | 899 | |
104059da | 900 | if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) { |
17604dac JK |
901 | rtc_coalesced_timer_update(s); |
902 | } | |
17604dac JK |
903 | } |
904 | ||
da98c8eb GH |
905 | /* set CMOS shutdown status register (index 0xF) as S3_resume(0xFE) |
906 | BIOS will read it and start S3 resume at POST Entry */ | |
907 | static void rtc_notify_suspend(Notifier *notifier, void *data) | |
908 | { | |
909 | RTCState *s = container_of(notifier, RTCState, suspend_notifier); | |
0e41271e | 910 | rtc_set_memory(ISA_DEVICE(s), 0xF, 0xFE); |
da98c8eb GH |
911 | } |
912 | ||
eeb7c03c GN |
913 | static void rtc_reset(void *opaque) |
914 | { | |
915 | RTCState *s = opaque; | |
916 | ||
72716184 AL |
917 | s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE); |
918 | s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF); | |
56038ef6 | 919 | check_update_timer(s); |
eeb7c03c | 920 | |
72716184 | 921 | qemu_irq_lower(s->irq); |
eeb7c03c | 922 | |
104059da | 923 | if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) { |
433acf0d | 924 | s->irq_coalesced = 0; |
7cd9681b | 925 | s->irq_reinject_on_ack_count = 0; |
433acf0d | 926 | } |
eeb7c03c GN |
927 | } |
928 | ||
b2c5009b | 929 | static const MemoryRegionOps cmos_ops = { |
0da8c842 AG |
930 | .read = cmos_ioport_read, |
931 | .write = cmos_ioport_write, | |
932 | .impl = { | |
933 | .min_access_size = 1, | |
934 | .max_access_size = 1, | |
935 | }, | |
936 | .endianness = DEVICE_LITTLE_ENDIAN, | |
b2c5009b RH |
937 | }; |
938 | ||
8e099d14 | 939 | static void rtc_get_date(Object *obj, struct tm *current_tm, Error **errp) |
18297050 | 940 | { |
0e41271e | 941 | RTCState *s = MC146818_RTC(obj); |
18297050 | 942 | |
56038ef6 | 943 | rtc_update_time(s); |
8e099d14 | 944 | rtc_get_time(s, current_tm); |
18297050 AL |
945 | } |
946 | ||
db895a1e | 947 | static void rtc_realizefn(DeviceState *dev, Error **errp) |
dff38e7b | 948 | { |
db895a1e | 949 | ISADevice *isadev = ISA_DEVICE(dev); |
0e41271e | 950 | RTCState *s = MC146818_RTC(dev); |
32e0c826 | 951 | int base = 0x70; |
80cabfad | 952 | |
80cabfad FB |
953 | s->cmos_data[RTC_REG_A] = 0x26; |
954 | s->cmos_data[RTC_REG_B] = 0x02; | |
955 | s->cmos_data[RTC_REG_C] = 0x00; | |
956 | s->cmos_data[RTC_REG_D] = 0x80; | |
957 | ||
b8994faf PB |
958 | /* This is for historical reasons. The default base year qdev property |
959 | * was set to 2000 for most machine types before the century byte was | |
960 | * implemented. | |
961 | * | |
962 | * This if statement means that the century byte will be always 0 | |
963 | * (at least until 2079...) for base_year = 1980, but will be set | |
964 | * correctly for base_year = 2000. | |
965 | */ | |
966 | if (s->base_year == 2000) { | |
967 | s->base_year = 0; | |
968 | } | |
969 | ||
db895a1e | 970 | rtc_set_date_from_host(isadev); |
ea55ffb3 | 971 | |
433acf0d | 972 | switch (s->lost_tick_policy) { |
4aa70a0e | 973 | #ifdef TARGET_I386 |
104059da | 974 | case LOST_TICK_POLICY_SLEW: |
6875204c | 975 | s->coalesced_timer = |
884f17c2 | 976 | timer_new_ns(rtc_clock, rtc_coalesced_timer, s); |
433acf0d | 977 | break; |
4aa70a0e | 978 | #endif |
104059da | 979 | case LOST_TICK_POLICY_DISCARD: |
433acf0d JK |
980 | break; |
981 | default: | |
db895a1e AF |
982 | error_setg(errp, "Invalid lost tick policy."); |
983 | return; | |
433acf0d | 984 | } |
433acf0d | 985 | |
884f17c2 AB |
986 | s->periodic_timer = timer_new_ns(rtc_clock, rtc_periodic_timer, s); |
987 | s->update_timer = timer_new_ns(rtc_clock, rtc_update_timer, s); | |
56038ef6 | 988 | check_update_timer(s); |
dff38e7b | 989 | |
17604dac | 990 | s->clock_reset_notifier.notify = rtc_notify_clock_reset; |
13c0cbae | 991 | qemu_clock_register_reset_notifier(rtc_clock, |
884f17c2 | 992 | &s->clock_reset_notifier); |
17604dac | 993 | |
da98c8eb GH |
994 | s->suspend_notifier.notify = rtc_notify_suspend; |
995 | qemu_register_suspend_notifier(&s->suspend_notifier); | |
996 | ||
853dca12 | 997 | memory_region_init_io(&s->io, OBJECT(s), &cmos_ops, s, "rtc", 2); |
db895a1e | 998 | isa_register_ioport(isadev, &s->io, base); |
dff38e7b | 999 | |
f98167ea PH |
1000 | /* register rtc 0x70 port for coalesced_pio */ |
1001 | memory_region_set_flush_coalesced(&s->io); | |
1002 | memory_region_init_io(&s->coalesced_io, OBJECT(s), &cmos_ops, | |
1003 | s, "rtc-index", 1); | |
1004 | memory_region_add_subregion(&s->io, 0, &s->coalesced_io); | |
1005 | memory_region_add_coalescing(&s->coalesced_io, 0, 1); | |
1006 | ||
db895a1e | 1007 | qdev_set_legacy_instance_id(dev, base, 3); |
a08d4367 | 1008 | qemu_register_reset(rtc_reset, s); |
18297050 | 1009 | |
8e099d14 | 1010 | object_property_add_tm(OBJECT(s), "date", rtc_get_date, NULL); |
654a36d8 | 1011 | |
3638439d | 1012 | qdev_init_gpio_out(dev, &s->irq, 1); |
32e0c826 GH |
1013 | } |
1014 | ||
6c646a11 | 1015 | ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq) |
32e0c826 | 1016 | { |
0e41271e AF |
1017 | DeviceState *dev; |
1018 | ISADevice *isadev; | |
7d932dfd | 1019 | RTCState *s; |
eeb7c03c | 1020 | |
0e41271e AF |
1021 | isadev = isa_create(bus, TYPE_MC146818_RTC); |
1022 | dev = DEVICE(isadev); | |
1023 | s = MC146818_RTC(isadev); | |
1024 | qdev_prop_set_int32(dev, "base_year", base_year); | |
1025 | qdev_init_nofail(dev); | |
7d932dfd | 1026 | if (intercept_irq) { |
3638439d | 1027 | qdev_connect_gpio_out(dev, 0, intercept_irq); |
7d932dfd | 1028 | } else { |
3638439d | 1029 | isa_connect_gpio_out(isadev, 0, RTC_ISA_IRQ); |
7d932dfd | 1030 | } |
f2ae8abf MT |
1031 | QLIST_INSERT_HEAD(&rtc_devices, s, link); |
1032 | ||
29551fdc TH |
1033 | object_property_add_alias(qdev_get_machine(), "rtc-time", OBJECT(s), |
1034 | "date", NULL); | |
1035 | ||
0e41271e | 1036 | return isadev; |
80cabfad FB |
1037 | } |
1038 | ||
39bffca2 AL |
1039 | static Property mc146818rtc_properties[] = { |
1040 | DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980), | |
1041 | DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState, | |
104059da | 1042 | lost_tick_policy, LOST_TICK_POLICY_DISCARD), |
39bffca2 AL |
1043 | DEFINE_PROP_END_OF_LIST(), |
1044 | }; | |
1045 | ||
bf7bb91e | 1046 | static void rtc_resetdev(DeviceState *d) |
1047 | { | |
1048 | RTCState *s = MC146818_RTC(d); | |
1049 | ||
1050 | /* Reason: VM do suspend self will set 0xfe | |
1051 | * Reset any values other than 0xfe(Guest suspend case) */ | |
1052 | if (s->cmos_data[0x0f] != 0xfe) { | |
1053 | s->cmos_data[0x0f] = 0x00; | |
1054 | } | |
1055 | } | |
1056 | ||
8f04ee08 AL |
1057 | static void rtc_class_initfn(ObjectClass *klass, void *data) |
1058 | { | |
39bffca2 | 1059 | DeviceClass *dc = DEVICE_CLASS(klass); |
db895a1e AF |
1060 | |
1061 | dc->realize = rtc_realizefn; | |
bf7bb91e | 1062 | dc->reset = rtc_resetdev; |
39bffca2 AL |
1063 | dc->vmsd = &vmstate_rtc; |
1064 | dc->props = mc146818rtc_properties; | |
f3b17640 | 1065 | /* Reason: needs to be wired up by rtc_init() */ |
e90f2a8c | 1066 | dc->user_creatable = false; |
8f04ee08 AL |
1067 | } |
1068 | ||
8c43a6f0 | 1069 | static const TypeInfo mc146818rtc_info = { |
0e41271e | 1070 | .name = TYPE_MC146818_RTC, |
39bffca2 AL |
1071 | .parent = TYPE_ISA_DEVICE, |
1072 | .instance_size = sizeof(RTCState), | |
1073 | .class_init = rtc_class_initfn, | |
32e0c826 GH |
1074 | }; |
1075 | ||
83f7d43a | 1076 | static void mc146818rtc_register_types(void) |
100d9891 | 1077 | { |
39bffca2 | 1078 | type_register_static(&mc146818rtc_info); |
100d9891 | 1079 | } |
83f7d43a AF |
1080 | |
1081 | type_init(mc146818rtc_register_types) |