root / hw / mc146818rtc.c @ aa28b9bf
History | View | Annotate | Download (18.5 kB)
| 1 |
/*
|
|---|---|
| 2 |
* QEMU MC146818 RTC emulation
|
| 3 |
*
|
| 4 |
* Copyright (c) 2003-2004 Fabrice Bellard
|
| 5 |
*
|
| 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 |
*/
|
| 24 |
#include "hw.h" |
| 25 |
#include "qemu-timer.h" |
| 26 |
#include "sysemu.h" |
| 27 |
#include "pc.h" |
| 28 |
#include "apic.h" |
| 29 |
#include "isa.h" |
| 30 |
#include "hpet_emul.h" |
| 31 |
|
| 32 |
//#define DEBUG_CMOS
|
| 33 |
|
| 34 |
#define RTC_REINJECT_ON_ACK_COUNT 20 |
| 35 |
|
| 36 |
#define RTC_SECONDS 0 |
| 37 |
#define RTC_SECONDS_ALARM 1 |
| 38 |
#define RTC_MINUTES 2 |
| 39 |
#define RTC_MINUTES_ALARM 3 |
| 40 |
#define RTC_HOURS 4 |
| 41 |
#define RTC_HOURS_ALARM 5 |
| 42 |
#define RTC_ALARM_DONT_CARE 0xC0 |
| 43 |
|
| 44 |
#define RTC_DAY_OF_WEEK 6 |
| 45 |
#define RTC_DAY_OF_MONTH 7 |
| 46 |
#define RTC_MONTH 8 |
| 47 |
#define RTC_YEAR 9 |
| 48 |
|
| 49 |
#define RTC_REG_A 10 |
| 50 |
#define RTC_REG_B 11 |
| 51 |
#define RTC_REG_C 12 |
| 52 |
#define RTC_REG_D 13 |
| 53 |
|
| 54 |
#define REG_A_UIP 0x80 |
| 55 |
|
| 56 |
#define REG_B_SET 0x80 |
| 57 |
#define REG_B_PIE 0x40 |
| 58 |
#define REG_B_AIE 0x20 |
| 59 |
#define REG_B_UIE 0x10 |
| 60 |
#define REG_B_SQWE 0x08 |
| 61 |
#define REG_B_DM 0x04 |
| 62 |
|
| 63 |
#define REG_C_UF 0x10 |
| 64 |
#define REG_C_IRQF 0x80 |
| 65 |
#define REG_C_PF 0x40 |
| 66 |
#define REG_C_AF 0x20 |
| 67 |
|
| 68 |
struct RTCState {
|
| 69 |
ISADevice dev; |
| 70 |
uint8_t cmos_data[128];
|
| 71 |
uint8_t cmos_index; |
| 72 |
struct tm current_tm;
|
| 73 |
int32_t base_year; |
| 74 |
qemu_irq irq; |
| 75 |
qemu_irq sqw_irq; |
| 76 |
int it_shift;
|
| 77 |
/* periodic timer */
|
| 78 |
QEMUTimer *periodic_timer; |
| 79 |
int64_t next_periodic_time; |
| 80 |
/* second update */
|
| 81 |
int64_t next_second_time; |
| 82 |
uint16_t irq_reinject_on_ack_count; |
| 83 |
uint32_t irq_coalesced; |
| 84 |
uint32_t period; |
| 85 |
QEMUTimer *coalesced_timer; |
| 86 |
QEMUTimer *second_timer; |
| 87 |
QEMUTimer *second_timer2; |
| 88 |
}; |
| 89 |
|
| 90 |
static void rtc_irq_raise(qemu_irq irq) |
| 91 |
{
|
| 92 |
/* When HPET is operating in legacy mode, RTC interrupts are disabled
|
| 93 |
* We block qemu_irq_raise, but not qemu_irq_lower, in case legacy
|
| 94 |
* mode is established while interrupt is raised. We want it to
|
| 95 |
* be lowered in any case
|
| 96 |
*/
|
| 97 |
#if defined TARGET_I386
|
| 98 |
if (!hpet_in_legacy_mode())
|
| 99 |
#endif
|
| 100 |
qemu_irq_raise(irq); |
| 101 |
} |
| 102 |
|
| 103 |
static void rtc_set_time(RTCState *s); |
| 104 |
static void rtc_copy_date(RTCState *s); |
| 105 |
|
| 106 |
#ifdef TARGET_I386
|
| 107 |
static void rtc_coalesced_timer_update(RTCState *s) |
| 108 |
{
|
| 109 |
if (s->irq_coalesced == 0) { |
| 110 |
qemu_del_timer(s->coalesced_timer); |
| 111 |
} else {
|
| 112 |
/* divide each RTC interval to 2 - 8 smaller intervals */
|
| 113 |
int c = MIN(s->irq_coalesced, 7) + 1; |
| 114 |
int64_t next_clock = qemu_get_clock(rtc_clock) + |
| 115 |
muldiv64(s->period / c, get_ticks_per_sec(), 32768);
|
| 116 |
qemu_mod_timer(s->coalesced_timer, next_clock); |
| 117 |
} |
| 118 |
} |
| 119 |
|
| 120 |
static void rtc_coalesced_timer(void *opaque) |
| 121 |
{
|
| 122 |
RTCState *s = opaque; |
| 123 |
|
| 124 |
if (s->irq_coalesced != 0) { |
| 125 |
apic_reset_irq_delivered(); |
| 126 |
s->cmos_data[RTC_REG_C] |= 0xc0;
|
| 127 |
rtc_irq_raise(s->irq); |
| 128 |
if (apic_get_irq_delivered()) {
|
| 129 |
s->irq_coalesced--; |
| 130 |
} |
| 131 |
} |
| 132 |
|
| 133 |
rtc_coalesced_timer_update(s); |
| 134 |
} |
| 135 |
#endif
|
| 136 |
|
| 137 |
static void rtc_timer_update(RTCState *s, int64_t current_time) |
| 138 |
{
|
| 139 |
int period_code, period;
|
| 140 |
int64_t cur_clock, next_irq_clock; |
| 141 |
int enable_pie;
|
| 142 |
|
| 143 |
period_code = s->cmos_data[RTC_REG_A] & 0x0f;
|
| 144 |
#if defined TARGET_I386
|
| 145 |
/* disable periodic timer if hpet is in legacy mode, since interrupts are
|
| 146 |
* disabled anyway.
|
| 147 |
*/
|
| 148 |
enable_pie = !hpet_in_legacy_mode(); |
| 149 |
#else
|
| 150 |
enable_pie = 1;
|
| 151 |
#endif
|
| 152 |
if (period_code != 0 |
| 153 |
&& (((s->cmos_data[RTC_REG_B] & REG_B_PIE) && enable_pie) |
| 154 |
|| ((s->cmos_data[RTC_REG_B] & REG_B_SQWE) && s->sqw_irq))) {
|
| 155 |
if (period_code <= 2) |
| 156 |
period_code += 7;
|
| 157 |
/* period in 32 Khz cycles */
|
| 158 |
period = 1 << (period_code - 1); |
| 159 |
#ifdef TARGET_I386
|
| 160 |
if(period != s->period)
|
| 161 |
s->irq_coalesced = (s->irq_coalesced * s->period) / period; |
| 162 |
s->period = period; |
| 163 |
#endif
|
| 164 |
/* compute 32 khz clock */
|
| 165 |
cur_clock = muldiv64(current_time, 32768, get_ticks_per_sec());
|
| 166 |
next_irq_clock = (cur_clock & ~(period - 1)) + period;
|
| 167 |
s->next_periodic_time = |
| 168 |
muldiv64(next_irq_clock, get_ticks_per_sec(), 32768) + 1; |
| 169 |
qemu_mod_timer(s->periodic_timer, s->next_periodic_time); |
| 170 |
} else {
|
| 171 |
#ifdef TARGET_I386
|
| 172 |
s->irq_coalesced = 0;
|
| 173 |
#endif
|
| 174 |
qemu_del_timer(s->periodic_timer); |
| 175 |
} |
| 176 |
} |
| 177 |
|
| 178 |
static void rtc_periodic_timer(void *opaque) |
| 179 |
{
|
| 180 |
RTCState *s = opaque; |
| 181 |
|
| 182 |
rtc_timer_update(s, s->next_periodic_time); |
| 183 |
if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
|
| 184 |
s->cmos_data[RTC_REG_C] |= 0xc0;
|
| 185 |
#ifdef TARGET_I386
|
| 186 |
if(rtc_td_hack) {
|
| 187 |
if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT)
|
| 188 |
s->irq_reinject_on_ack_count = 0;
|
| 189 |
apic_reset_irq_delivered(); |
| 190 |
rtc_irq_raise(s->irq); |
| 191 |
if (!apic_get_irq_delivered()) {
|
| 192 |
s->irq_coalesced++; |
| 193 |
rtc_coalesced_timer_update(s); |
| 194 |
} |
| 195 |
} else
|
| 196 |
#endif
|
| 197 |
rtc_irq_raise(s->irq); |
| 198 |
} |
| 199 |
if (s->cmos_data[RTC_REG_B] & REG_B_SQWE) {
|
| 200 |
/* Not square wave at all but we don't want 2048Hz interrupts!
|
| 201 |
Must be seen as a pulse. */
|
| 202 |
qemu_irq_raise(s->sqw_irq); |
| 203 |
} |
| 204 |
} |
| 205 |
|
| 206 |
static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data) |
| 207 |
{
|
| 208 |
RTCState *s = opaque; |
| 209 |
|
| 210 |
if ((addr & 1) == 0) { |
| 211 |
s->cmos_index = data & 0x7f;
|
| 212 |
} else {
|
| 213 |
#ifdef DEBUG_CMOS
|
| 214 |
printf("cmos: write index=0x%02x val=0x%02x\n",
|
| 215 |
s->cmos_index, data); |
| 216 |
#endif
|
| 217 |
switch(s->cmos_index) {
|
| 218 |
case RTC_SECONDS_ALARM:
|
| 219 |
case RTC_MINUTES_ALARM:
|
| 220 |
case RTC_HOURS_ALARM:
|
| 221 |
/* XXX: not supported */
|
| 222 |
s->cmos_data[s->cmos_index] = data; |
| 223 |
break;
|
| 224 |
case RTC_SECONDS:
|
| 225 |
case RTC_MINUTES:
|
| 226 |
case RTC_HOURS:
|
| 227 |
case RTC_DAY_OF_WEEK:
|
| 228 |
case RTC_DAY_OF_MONTH:
|
| 229 |
case RTC_MONTH:
|
| 230 |
case RTC_YEAR:
|
| 231 |
s->cmos_data[s->cmos_index] = data; |
| 232 |
/* if in set mode, do not update the time */
|
| 233 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
| 234 |
rtc_set_time(s); |
| 235 |
} |
| 236 |
break;
|
| 237 |
case RTC_REG_A:
|
| 238 |
/* UIP bit is read only */
|
| 239 |
s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) | |
| 240 |
(s->cmos_data[RTC_REG_A] & REG_A_UIP); |
| 241 |
rtc_timer_update(s, qemu_get_clock(rtc_clock)); |
| 242 |
break;
|
| 243 |
case RTC_REG_B:
|
| 244 |
if (data & REG_B_SET) {
|
| 245 |
/* set mode: reset UIP mode */
|
| 246 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
| 247 |
data &= ~REG_B_UIE; |
| 248 |
} else {
|
| 249 |
/* if disabling set mode, update the time */
|
| 250 |
if (s->cmos_data[RTC_REG_B] & REG_B_SET) {
|
| 251 |
rtc_set_time(s); |
| 252 |
} |
| 253 |
} |
| 254 |
s->cmos_data[RTC_REG_B] = data; |
| 255 |
rtc_timer_update(s, qemu_get_clock(rtc_clock)); |
| 256 |
break;
|
| 257 |
case RTC_REG_C:
|
| 258 |
case RTC_REG_D:
|
| 259 |
/* cannot write to them */
|
| 260 |
break;
|
| 261 |
default:
|
| 262 |
s->cmos_data[s->cmos_index] = data; |
| 263 |
break;
|
| 264 |
} |
| 265 |
} |
| 266 |
} |
| 267 |
|
| 268 |
static inline int rtc_to_bcd(RTCState *s, int a) |
| 269 |
{
|
| 270 |
if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
|
| 271 |
return a;
|
| 272 |
} else {
|
| 273 |
return ((a / 10) << 4) | (a % 10); |
| 274 |
} |
| 275 |
} |
| 276 |
|
| 277 |
static inline int rtc_from_bcd(RTCState *s, int a) |
| 278 |
{
|
| 279 |
if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
|
| 280 |
return a;
|
| 281 |
} else {
|
| 282 |
return ((a >> 4) * 10) + (a & 0x0f); |
| 283 |
} |
| 284 |
} |
| 285 |
|
| 286 |
static void rtc_set_time(RTCState *s) |
| 287 |
{
|
| 288 |
struct tm *tm = &s->current_tm;
|
| 289 |
|
| 290 |
tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); |
| 291 |
tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); |
| 292 |
tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
|
| 293 |
if (!(s->cmos_data[RTC_REG_B] & 0x02) && |
| 294 |
(s->cmos_data[RTC_HOURS] & 0x80)) {
|
| 295 |
tm->tm_hour += 12;
|
| 296 |
} |
| 297 |
tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
|
| 298 |
tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]); |
| 299 |
tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
|
| 300 |
tm->tm_year = rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
|
| 301 |
|
| 302 |
rtc_change_mon_event(tm); |
| 303 |
} |
| 304 |
|
| 305 |
static void rtc_copy_date(RTCState *s) |
| 306 |
{
|
| 307 |
const struct tm *tm = &s->current_tm; |
| 308 |
int year;
|
| 309 |
|
| 310 |
s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec); |
| 311 |
s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min); |
| 312 |
if (s->cmos_data[RTC_REG_B] & 0x02) { |
| 313 |
/* 24 hour format */
|
| 314 |
s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour); |
| 315 |
} else {
|
| 316 |
/* 12 hour format */
|
| 317 |
s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour % 12);
|
| 318 |
if (tm->tm_hour >= 12) |
| 319 |
s->cmos_data[RTC_HOURS] |= 0x80;
|
| 320 |
} |
| 321 |
s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
|
| 322 |
s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday); |
| 323 |
s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
|
| 324 |
year = (tm->tm_year - s->base_year) % 100;
|
| 325 |
if (year < 0) |
| 326 |
year += 100;
|
| 327 |
s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year); |
| 328 |
} |
| 329 |
|
| 330 |
/* month is between 0 and 11. */
|
| 331 |
static int get_days_in_month(int month, int year) |
| 332 |
{
|
| 333 |
static const int days_tab[12] = { |
| 334 |
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
| 335 |
}; |
| 336 |
int d;
|
| 337 |
if ((unsigned )month >= 12) |
| 338 |
return 31; |
| 339 |
d = days_tab[month]; |
| 340 |
if (month == 1) { |
| 341 |
if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) |
| 342 |
d++; |
| 343 |
} |
| 344 |
return d;
|
| 345 |
} |
| 346 |
|
| 347 |
/* update 'tm' to the next second */
|
| 348 |
static void rtc_next_second(struct tm *tm) |
| 349 |
{
|
| 350 |
int days_in_month;
|
| 351 |
|
| 352 |
tm->tm_sec++; |
| 353 |
if ((unsigned)tm->tm_sec >= 60) { |
| 354 |
tm->tm_sec = 0;
|
| 355 |
tm->tm_min++; |
| 356 |
if ((unsigned)tm->tm_min >= 60) { |
| 357 |
tm->tm_min = 0;
|
| 358 |
tm->tm_hour++; |
| 359 |
if ((unsigned)tm->tm_hour >= 24) { |
| 360 |
tm->tm_hour = 0;
|
| 361 |
/* next day */
|
| 362 |
tm->tm_wday++; |
| 363 |
if ((unsigned)tm->tm_wday >= 7) |
| 364 |
tm->tm_wday = 0;
|
| 365 |
days_in_month = get_days_in_month(tm->tm_mon, |
| 366 |
tm->tm_year + 1900);
|
| 367 |
tm->tm_mday++; |
| 368 |
if (tm->tm_mday < 1) { |
| 369 |
tm->tm_mday = 1;
|
| 370 |
} else if (tm->tm_mday > days_in_month) { |
| 371 |
tm->tm_mday = 1;
|
| 372 |
tm->tm_mon++; |
| 373 |
if (tm->tm_mon >= 12) { |
| 374 |
tm->tm_mon = 0;
|
| 375 |
tm->tm_year++; |
| 376 |
} |
| 377 |
} |
| 378 |
} |
| 379 |
} |
| 380 |
} |
| 381 |
} |
| 382 |
|
| 383 |
|
| 384 |
static void rtc_update_second(void *opaque) |
| 385 |
{
|
| 386 |
RTCState *s = opaque; |
| 387 |
int64_t delay; |
| 388 |
|
| 389 |
/* if the oscillator is not in normal operation, we do not update */
|
| 390 |
if ((s->cmos_data[RTC_REG_A] & 0x70) != 0x20) { |
| 391 |
s->next_second_time += get_ticks_per_sec(); |
| 392 |
qemu_mod_timer(s->second_timer, s->next_second_time); |
| 393 |
} else {
|
| 394 |
rtc_next_second(&s->current_tm); |
| 395 |
|
| 396 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
| 397 |
/* update in progress bit */
|
| 398 |
s->cmos_data[RTC_REG_A] |= REG_A_UIP; |
| 399 |
} |
| 400 |
/* should be 244 us = 8 / 32768 seconds, but currently the
|
| 401 |
timers do not have the necessary resolution. */
|
| 402 |
delay = (get_ticks_per_sec() * 1) / 100; |
| 403 |
if (delay < 1) |
| 404 |
delay = 1;
|
| 405 |
qemu_mod_timer(s->second_timer2, |
| 406 |
s->next_second_time + delay); |
| 407 |
} |
| 408 |
} |
| 409 |
|
| 410 |
static void rtc_update_second2(void *opaque) |
| 411 |
{
|
| 412 |
RTCState *s = opaque; |
| 413 |
|
| 414 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
| 415 |
rtc_copy_date(s); |
| 416 |
} |
| 417 |
|
| 418 |
/* check alarm */
|
| 419 |
if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
|
| 420 |
if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 || |
| 421 |
s->cmos_data[RTC_SECONDS_ALARM] == s->current_tm.tm_sec) && |
| 422 |
((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 || |
| 423 |
s->cmos_data[RTC_MINUTES_ALARM] == s->current_tm.tm_mon) && |
| 424 |
((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 || |
| 425 |
s->cmos_data[RTC_HOURS_ALARM] == s->current_tm.tm_hour)) {
|
| 426 |
|
| 427 |
s->cmos_data[RTC_REG_C] |= 0xa0;
|
| 428 |
rtc_irq_raise(s->irq); |
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
/* update ended interrupt */
|
| 433 |
s->cmos_data[RTC_REG_C] |= REG_C_UF; |
| 434 |
if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
|
| 435 |
s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
| 436 |
rtc_irq_raise(s->irq); |
| 437 |
} |
| 438 |
|
| 439 |
/* clear update in progress bit */
|
| 440 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
| 441 |
|
| 442 |
s->next_second_time += get_ticks_per_sec(); |
| 443 |
qemu_mod_timer(s->second_timer, s->next_second_time); |
| 444 |
} |
| 445 |
|
| 446 |
static uint32_t cmos_ioport_read(void *opaque, uint32_t addr) |
| 447 |
{
|
| 448 |
RTCState *s = opaque; |
| 449 |
int ret;
|
| 450 |
if ((addr & 1) == 0) { |
| 451 |
return 0xff; |
| 452 |
} else {
|
| 453 |
switch(s->cmos_index) {
|
| 454 |
case RTC_SECONDS:
|
| 455 |
case RTC_MINUTES:
|
| 456 |
case RTC_HOURS:
|
| 457 |
case RTC_DAY_OF_WEEK:
|
| 458 |
case RTC_DAY_OF_MONTH:
|
| 459 |
case RTC_MONTH:
|
| 460 |
case RTC_YEAR:
|
| 461 |
ret = s->cmos_data[s->cmos_index]; |
| 462 |
break;
|
| 463 |
case RTC_REG_A:
|
| 464 |
ret = s->cmos_data[s->cmos_index]; |
| 465 |
break;
|
| 466 |
case RTC_REG_C:
|
| 467 |
ret = s->cmos_data[s->cmos_index]; |
| 468 |
qemu_irq_lower(s->irq); |
| 469 |
#ifdef TARGET_I386
|
| 470 |
if(s->irq_coalesced &&
|
| 471 |
s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) {
|
| 472 |
s->irq_reinject_on_ack_count++; |
| 473 |
apic_reset_irq_delivered(); |
| 474 |
qemu_irq_raise(s->irq); |
| 475 |
if (apic_get_irq_delivered())
|
| 476 |
s->irq_coalesced--; |
| 477 |
break;
|
| 478 |
} |
| 479 |
#endif
|
| 480 |
|
| 481 |
s->cmos_data[RTC_REG_C] = 0x00;
|
| 482 |
break;
|
| 483 |
default:
|
| 484 |
ret = s->cmos_data[s->cmos_index]; |
| 485 |
break;
|
| 486 |
} |
| 487 |
#ifdef DEBUG_CMOS
|
| 488 |
printf("cmos: read index=0x%02x val=0x%02x\n",
|
| 489 |
s->cmos_index, ret); |
| 490 |
#endif
|
| 491 |
return ret;
|
| 492 |
} |
| 493 |
} |
| 494 |
|
| 495 |
void rtc_set_memory(RTCState *s, int addr, int val) |
| 496 |
{
|
| 497 |
if (addr >= 0 && addr <= 127) |
| 498 |
s->cmos_data[addr] = val; |
| 499 |
} |
| 500 |
|
| 501 |
void rtc_set_date(RTCState *s, const struct tm *tm) |
| 502 |
{
|
| 503 |
s->current_tm = *tm; |
| 504 |
rtc_copy_date(s); |
| 505 |
} |
| 506 |
|
| 507 |
/* PC cmos mappings */
|
| 508 |
#define REG_IBM_CENTURY_BYTE 0x32 |
| 509 |
#define REG_IBM_PS2_CENTURY_BYTE 0x37 |
| 510 |
|
| 511 |
static void rtc_set_date_from_host(RTCState *s) |
| 512 |
{
|
| 513 |
struct tm tm;
|
| 514 |
int val;
|
| 515 |
|
| 516 |
/* set the CMOS date */
|
| 517 |
qemu_get_timedate(&tm, 0);
|
| 518 |
rtc_set_date(s, &tm); |
| 519 |
|
| 520 |
val = rtc_to_bcd(s, (tm.tm_year / 100) + 19); |
| 521 |
rtc_set_memory(s, REG_IBM_CENTURY_BYTE, val); |
| 522 |
rtc_set_memory(s, REG_IBM_PS2_CENTURY_BYTE, val); |
| 523 |
} |
| 524 |
|
| 525 |
static int rtc_post_load(void *opaque, int version_id) |
| 526 |
{
|
| 527 |
#ifdef TARGET_I386
|
| 528 |
RTCState *s = opaque; |
| 529 |
|
| 530 |
if (version_id >= 2) { |
| 531 |
if (rtc_td_hack) {
|
| 532 |
rtc_coalesced_timer_update(s); |
| 533 |
} |
| 534 |
} |
| 535 |
#endif
|
| 536 |
return 0; |
| 537 |
} |
| 538 |
|
| 539 |
static const VMStateDescription vmstate_rtc = { |
| 540 |
.name = "mc146818rtc",
|
| 541 |
.version_id = 2,
|
| 542 |
.minimum_version_id = 1,
|
| 543 |
.minimum_version_id_old = 1,
|
| 544 |
.post_load = rtc_post_load, |
| 545 |
.fields = (VMStateField []) {
|
| 546 |
VMSTATE_BUFFER(cmos_data, RTCState), |
| 547 |
VMSTATE_UINT8(cmos_index, RTCState), |
| 548 |
VMSTATE_INT32(current_tm.tm_sec, RTCState), |
| 549 |
VMSTATE_INT32(current_tm.tm_min, RTCState), |
| 550 |
VMSTATE_INT32(current_tm.tm_hour, RTCState), |
| 551 |
VMSTATE_INT32(current_tm.tm_wday, RTCState), |
| 552 |
VMSTATE_INT32(current_tm.tm_mday, RTCState), |
| 553 |
VMSTATE_INT32(current_tm.tm_mon, RTCState), |
| 554 |
VMSTATE_INT32(current_tm.tm_year, RTCState), |
| 555 |
VMSTATE_TIMER(periodic_timer, RTCState), |
| 556 |
VMSTATE_INT64(next_periodic_time, RTCState), |
| 557 |
VMSTATE_INT64(next_second_time, RTCState), |
| 558 |
VMSTATE_TIMER(second_timer, RTCState), |
| 559 |
VMSTATE_TIMER(second_timer2, RTCState), |
| 560 |
VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
|
| 561 |
VMSTATE_UINT32_V(period, RTCState, 2),
|
| 562 |
VMSTATE_END_OF_LIST() |
| 563 |
} |
| 564 |
}; |
| 565 |
|
| 566 |
static void rtc_reset(void *opaque) |
| 567 |
{
|
| 568 |
RTCState *s = opaque; |
| 569 |
|
| 570 |
s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE); |
| 571 |
s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF); |
| 572 |
|
| 573 |
qemu_irq_lower(s->irq); |
| 574 |
|
| 575 |
#ifdef TARGET_I386
|
| 576 |
if (rtc_td_hack)
|
| 577 |
s->irq_coalesced = 0;
|
| 578 |
#endif
|
| 579 |
} |
| 580 |
|
| 581 |
static int rtc_initfn(ISADevice *dev) |
| 582 |
{
|
| 583 |
RTCState *s = DO_UPCAST(RTCState, dev, dev); |
| 584 |
int base = 0x70; |
| 585 |
int isairq = 8; |
| 586 |
|
| 587 |
isa_init_irq(dev, &s->irq, isairq); |
| 588 |
|
| 589 |
s->cmos_data[RTC_REG_A] = 0x26;
|
| 590 |
s->cmos_data[RTC_REG_B] = 0x02;
|
| 591 |
s->cmos_data[RTC_REG_C] = 0x00;
|
| 592 |
s->cmos_data[RTC_REG_D] = 0x80;
|
| 593 |
|
| 594 |
rtc_set_date_from_host(s); |
| 595 |
|
| 596 |
s->periodic_timer = qemu_new_timer(rtc_clock, rtc_periodic_timer, s); |
| 597 |
#ifdef TARGET_I386
|
| 598 |
if (rtc_td_hack)
|
| 599 |
s->coalesced_timer = |
| 600 |
qemu_new_timer(rtc_clock, rtc_coalesced_timer, s); |
| 601 |
#endif
|
| 602 |
s->second_timer = qemu_new_timer(rtc_clock, rtc_update_second, s); |
| 603 |
s->second_timer2 = qemu_new_timer(rtc_clock, rtc_update_second2, s); |
| 604 |
|
| 605 |
s->next_second_time = |
| 606 |
qemu_get_clock(rtc_clock) + (get_ticks_per_sec() * 99) / 100; |
| 607 |
qemu_mod_timer(s->second_timer2, s->next_second_time); |
| 608 |
|
| 609 |
register_ioport_write(base, 2, 1, cmos_ioport_write, s); |
| 610 |
register_ioport_read(base, 2, 1, cmos_ioport_read, s); |
| 611 |
|
| 612 |
vmstate_register(base, &vmstate_rtc, s); |
| 613 |
qemu_register_reset(rtc_reset, s); |
| 614 |
return 0; |
| 615 |
} |
| 616 |
|
| 617 |
RTCState *rtc_init(int base_year)
|
| 618 |
{
|
| 619 |
ISADevice *dev; |
| 620 |
|
| 621 |
dev = isa_create("mc146818rtc");
|
| 622 |
qdev_prop_set_int32(&dev->qdev, "base_year", base_year);
|
| 623 |
qdev_init_nofail(&dev->qdev); |
| 624 |
return DO_UPCAST(RTCState, dev, dev);
|
| 625 |
} |
| 626 |
|
| 627 |
static ISADeviceInfo mc146818rtc_info = {
|
| 628 |
.qdev.name = "mc146818rtc",
|
| 629 |
.qdev.size = sizeof(RTCState),
|
| 630 |
.qdev.no_user = 1,
|
| 631 |
.init = rtc_initfn, |
| 632 |
.qdev.props = (Property[]) {
|
| 633 |
DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980), |
| 634 |
DEFINE_PROP_END_OF_LIST(), |
| 635 |
} |
| 636 |
}; |
| 637 |
|
| 638 |
static void mc146818rtc_register(void) |
| 639 |
{
|
| 640 |
isa_qdev_register(&mc146818rtc_info); |
| 641 |
} |
| 642 |
device_init(mc146818rtc_register) |