hw/mc146818rtc.c

   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 "isa.h"
  29 #include "hpet_emul.h"
  30
  31 //#define DEBUG_CMOS
  32
  33 #define RTC_SECONDS             0
  34 #define RTC_SECONDS_ALARM       1
  35 #define RTC_MINUTES             2
  36 #define RTC_MINUTES_ALARM       3
  37 #define RTC_HOURS               4
  38 #define RTC_HOURS_ALARM         5
  39 #define RTC_ALARM_DONT_CARE    0xC0
  40
  41 #define RTC_DAY_OF_WEEK         6
  42 #define RTC_DAY_OF_MONTH        7
  43 #define RTC_MONTH               8
  44 #define RTC_YEAR                9
  45
  46 #define RTC_REG_A               10
  47 #define RTC_REG_B               11
  48 #define RTC_REG_C               12
  49 #define RTC_REG_D               13
  50
  51 #define REG_A_UIP 0x80
  52
  53 #define REG_B_SET  0x80
  54 #define REG_B_PIE  0x40
  55 #define REG_B_AIE  0x20
  56 #define REG_B_UIE  0x10
  57 #define REG_B_SQWE 0x08
  58 #define REG_B_DM   0x04
  59
  60 #define REG_C_UF   0x10
  61 #define REG_C_IRQF 0x80
  62 #define REG_C_PF   0x40
  63 #define REG_C_AF   0x20
  64
  65 struct RTCState {
  66     uint8_t cmos_data[128];
  67     uint8_t cmos_index;
  68     struct tm current_tm;
  69     int base_year;
  70     qemu_irq irq;
  71     qemu_irq sqw_irq;
  72     int it_shift;
  73     /* periodic timer */
  74     QEMUTimer *periodic_timer;
  75     int64_t next_periodic_time;
  76     /* second update */
  77     int64_t next_second_time;
  78 #ifdef TARGET_I386
  79     uint32_t irq_coalesced;
  80     uint32_t period;
  81     QEMUTimer *coalesced_timer;
  82 #endif
  83     QEMUTimer *second_timer;
  84     QEMUTimer *second_timer2;
  85 };
  86
  87 static void rtc_irq_raise(qemu_irq irq) {
  88     /* When HPET is operating in legacy mode, RTC interrupts are disabled
  89      * We block qemu_irq_raise, but not qemu_irq_lower, in case legacy
  90      * mode is established while interrupt is raised. We want it to
  91      * be lowered in any case
  92      */
  93 #if defined TARGET_I386 || defined TARGET_X86_64
  94     if (!hpet_in_legacy_mode())
  95 #endif
  96         qemu_irq_raise(irq);
  97 }
  98
  99 static void rtc_set_time(RTCState *s);
 100 static void rtc_copy_date(RTCState *s);
 101
 102 #ifdef TARGET_I386
 103 static void rtc_coalesced_timer_update(RTCState *s)
 104 {
 105     if (s->irq_coalesced == 0) {
 106         qemu_del_timer(s->coalesced_timer);
 107     } else {
 108         /* divide each RTC interval to 2 - 8 smaller intervals */
 109         int c = MIN(s->irq_coalesced, 7) + 1;
 110         int64_t next_clock = qemu_get_clock(vm_clock) +
 111                 muldiv64(s->period / c, ticks_per_sec, 32768);
 112         qemu_mod_timer(s->coalesced_timer, next_clock);
 113     }
 114 }
 115
 116 static void rtc_coalesced_timer(void *opaque)
 117 {
 118     RTCState *s = opaque;
 119
 120     if (s->irq_coalesced != 0) {
 121         apic_reset_irq_delivered();
 122         s->cmos_data[RTC_REG_C] |= 0xc0;
 123         rtc_irq_raise(s->irq);
 124         if (apic_get_irq_delivered()) {
 125             s->irq_coalesced--;
 126         }
 127     }
 128
 129     rtc_coalesced_timer_update(s);
 130 }
 131 #endif
 132
 133 static void rtc_timer_update(RTCState *s, int64_t current_time)
 134 {
 135     int period_code, period;
 136     int64_t cur_clock, next_irq_clock;
 137     int enable_pie;
 138
 139     period_code = s->cmos_data[RTC_REG_A] & 0x0f;
 140 #if defined TARGET_I386 || defined TARGET_X86_64
 141     /* disable periodic timer if hpet is in legacy mode, since interrupts are
 142      * disabled anyway.
 143      */
 144     enable_pie = !hpet_in_legacy_mode();
 145 #else
 146     enable_pie = 1;
 147 #endif
 148     if (period_code != 0
 149         && (((s->cmos_data[RTC_REG_B] & REG_B_PIE) && enable_pie)
 150             || ((s->cmos_data[RTC_REG_B] & REG_B_SQWE) && s->sqw_irq))) {
 151         if (period_code <= 2)
 152             period_code += 7;
 153         /* period in 32 Khz cycles */
 154         period = 1 << (period_code - 1);
 155 #ifdef TARGET_I386
 156         if(period != s->period)
 157             s->irq_coalesced = (s->irq_coalesced * s->period) / period;
 158         s->period = period;
 159 #endif
 160         /* compute 32 khz clock */
 161         cur_clock = muldiv64(current_time, 32768, ticks_per_sec);
 162         next_irq_clock = (cur_clock & ~(period - 1)) + period;
 163         s->next_periodic_time = muldiv64(next_irq_clock, ticks_per_sec, 32768) + 1;
 164         qemu_mod_timer(s->periodic_timer, s->next_periodic_time);
 165     } else {
 166 #ifdef TARGET_I386
 167         s->irq_coalesced = 0;
 168 #endif
 169         qemu_del_timer(s->periodic_timer);
 170     }
 171 }
 172
 173 static void rtc_periodic_timer(void *opaque)
 174 {
 175     RTCState *s = opaque;
 176
 177     rtc_timer_update(s, s->next_periodic_time);
 178     if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
 179         s->cmos_data[RTC_REG_C] |= 0xc0;
 180 #ifdef TARGET_I386
 181         if(rtc_td_hack) {
 182             apic_reset_irq_delivered();
 183             rtc_irq_raise(s->irq);
 184             if (!apic_get_irq_delivered()) {
 185                 s->irq_coalesced++;
 186                 rtc_coalesced_timer_update(s);
 187             }
 188         } else
 189 #endif
 190         rtc_irq_raise(s->irq);
 191     }
 192     if (s->cmos_data[RTC_REG_B] & REG_B_SQWE) {
 193         /* Not square wave at all but we don't want 2048Hz interrupts!
 194            Must be seen as a pulse.  */
 195         qemu_irq_raise(s->sqw_irq);
 196     }
 197 }
 198
 199 static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
 200 {
 201     RTCState *s = opaque;
 202
 203     if ((addr & 1) == 0) {
 204         s->cmos_index = data & 0x7f;
 205     } else {
 206 #ifdef DEBUG_CMOS
 207         printf("cmos: write index=0x%02x val=0x%02x\n",
 208                s->cmos_index, data);
 209 #endif
 210         switch(s->cmos_index) {
 211         case RTC_SECONDS_ALARM:
 212         case RTC_MINUTES_ALARM:
 213         case RTC_HOURS_ALARM:
 214             /* XXX: not supported */
 215             s->cmos_data[s->cmos_index] = data;
 216             break;
 217         case RTC_SECONDS:
 218         case RTC_MINUTES:
 219         case RTC_HOURS:
 220         case RTC_DAY_OF_WEEK:
 221         case RTC_DAY_OF_MONTH:
 222         case RTC_MONTH:
 223         case RTC_YEAR:
 224             s->cmos_data[s->cmos_index] = data;
 225             /* if in set mode, do not update the time */
 226             if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 227                 rtc_set_time(s);
 228             }
 229             break;
 230         case RTC_REG_A:
 231             /* UIP bit is read only */
 232             s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) |
 233                 (s->cmos_data[RTC_REG_A] & REG_A_UIP);
 234             rtc_timer_update(s, qemu_get_clock(vm_clock));
 235             break;
 236         case RTC_REG_B:
 237             if (data & REG_B_SET) {
 238                 /* set mode: reset UIP mode */
 239                 s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
 240                 data &= ~REG_B_UIE;
 241             } else {
 242                 /* if disabling set mode, update the time */
 243                 if (s->cmos_data[RTC_REG_B] & REG_B_SET) {
 244                     rtc_set_time(s);
 245                 }
 246             }
 247             s->cmos_data[RTC_REG_B] = data;
 248             rtc_timer_update(s, qemu_get_clock(vm_clock));
 249             break;
 250         case RTC_REG_C:
 251         case RTC_REG_D:
 252             /* cannot write to them */
 253             break;
 254         default:
 255             s->cmos_data[s->cmos_index] = data;
 256             break;
 257         }
 258     }
 259 }
 260
 261 static inline int to_bcd(RTCState *s, int a)
 262 {
 263     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
 264         return a;
 265     } else {
 266         return ((a / 10) << 4) | (a % 10);
 267     }
 268 }
 269
 270 static inline int from_bcd(RTCState *s, int a)
 271 {
 272     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
 273         return a;
 274     } else {
 275         return ((a >> 4) * 10) + (a & 0x0f);
 276     }
 277 }
 278
 279 static void rtc_set_time(RTCState *s)
 280 {
 281     struct tm *tm = &s->current_tm;
 282
 283     tm->tm_sec = from_bcd(s, s->cmos_data[RTC_SECONDS]);
 284     tm->tm_min = from_bcd(s, s->cmos_data[RTC_MINUTES]);
 285     tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
 286     if (!(s->cmos_data[RTC_REG_B] & 0x02) &&
 287         (s->cmos_data[RTC_HOURS] & 0x80)) {
 288         tm->tm_hour += 12;
 289     }
 290     tm->tm_wday = from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
 291     tm->tm_mday = from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
 292     tm->tm_mon = from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
 293     tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
 294 }
 295
 296 static void rtc_copy_date(RTCState *s)
 297 {
 298     const struct tm *tm = &s->current_tm;
 299     int year;
 300
 301     s->cmos_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec);
 302     s->cmos_data[RTC_MINUTES] = to_bcd(s, tm->tm_min);
 303     if (s->cmos_data[RTC_REG_B] & 0x02) {
 304         /* 24 hour format */
 305         s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour);
 306     } else {
 307         /* 12 hour format */
 308         s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour % 12);
 309         if (tm->tm_hour >= 12)
 310             s->cmos_data[RTC_HOURS] |= 0x80;
 311     }
 312     s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday + 1);
 313     s->cmos_data[RTC_DAY_OF_MONTH] = to_bcd(s, tm->tm_mday);
 314     s->cmos_data[RTC_MONTH] = to_bcd(s, tm->tm_mon + 1);
 315     year = (tm->tm_year - s->base_year) % 100;
 316     if (year < 0)
 317         year += 100;
 318     s->cmos_data[RTC_YEAR] = to_bcd(s, year);
 319 }
 320
 321 /* month is between 0 and 11. */
 322 static int get_days_in_month(int month, int year)
 323 {
 324     static const int days_tab[12] = {
 325         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
 326     };
 327     int d;
 328     if ((unsigned )month >= 12)
 329         return 31;
 330     d = days_tab[month];
 331     if (month == 1) {
 332         if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0))
 333             d++;
 334     }
 335     return d;
 336 }
 337
 338 /* update 'tm' to the next second */
 339 static void rtc_next_second(struct tm *tm)
 340 {
 341     int days_in_month;
 342
 343     tm->tm_sec++;
 344     if ((unsigned)tm->tm_sec >= 60) {
 345         tm->tm_sec = 0;
 346         tm->tm_min++;
 347         if ((unsigned)tm->tm_min >= 60) {
 348             tm->tm_min = 0;
 349             tm->tm_hour++;
 350             if ((unsigned)tm->tm_hour >= 24) {
 351                 tm->tm_hour = 0;
 352                 /* next day */
 353                 tm->tm_wday++;
 354                 if ((unsigned)tm->tm_wday >= 7)
 355                     tm->tm_wday = 0;
 356                 days_in_month = get_days_in_month(tm->tm_mon,
 357                                                   tm->tm_year + 1900);
 358                 tm->tm_mday++;
 359                 if (tm->tm_mday < 1) {
 360                     tm->tm_mday = 1;
 361                 } else if (tm->tm_mday > days_in_month) {
 362                     tm->tm_mday = 1;
 363                     tm->tm_mon++;
 364                     if (tm->tm_mon >= 12) {
 365                         tm->tm_mon = 0;
 366                         tm->tm_year++;
 367                     }
 368                 }
 369             }
 370         }
 371     }
 372 }
 373
 374
 375 static void rtc_update_second(void *opaque)
 376 {
 377     RTCState *s = opaque;
 378     int64_t delay;
 379
 380     /* if the oscillator is not in normal operation, we do not update */
 381     if ((s->cmos_data[RTC_REG_A] & 0x70) != 0x20) {
 382         s->next_second_time += ticks_per_sec;
 383         qemu_mod_timer(s->second_timer, s->next_second_time);
 384     } else {
 385         rtc_next_second(&s->current_tm);
 386
 387         if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 388             /* update in progress bit */
 389             s->cmos_data[RTC_REG_A] |= REG_A_UIP;
 390         }
 391         /* should be 244 us = 8 / 32768 seconds, but currently the
 392            timers do not have the necessary resolution. */
 393         delay = (ticks_per_sec * 1) / 100;
 394         if (delay < 1)
 395             delay = 1;
 396         qemu_mod_timer(s->second_timer2,
 397                        s->next_second_time + delay);
 398     }
 399 }
 400
 401 static void rtc_update_second2(void *opaque)
 402 {
 403     RTCState *s = opaque;
 404
 405     if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
 406         rtc_copy_date(s);
 407     }
 408
 409     /* check alarm */
 410     if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
 411         if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 ||
 412              s->cmos_data[RTC_SECONDS_ALARM] == s->current_tm.tm_sec) &&
 413             ((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 ||
 414              s->cmos_data[RTC_MINUTES_ALARM] == s->current_tm.tm_mon) &&
 415             ((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 ||
 416              s->cmos_data[RTC_HOURS_ALARM] == s->current_tm.tm_hour)) {
 417
 418             s->cmos_data[RTC_REG_C] |= 0xa0;
 419             rtc_irq_raise(s->irq);
 420         }
 421     }
 422
 423     /* update ended interrupt */
 424     s->cmos_data[RTC_REG_C] |= REG_C_UF;
 425     if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
 426       s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
 427       rtc_irq_raise(s->irq);
 428     }
 429
 430     /* clear update in progress bit */
 431     s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
 432
 433     s->next_second_time += ticks_per_sec;
 434     qemu_mod_timer(s->second_timer, s->next_second_time);
 435 }
 436
 437 static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
 438 {
 439     RTCState *s = opaque;
 440     int ret;
 441     if ((addr & 1) == 0) {
 442         return 0xff;
 443     } else {
 444         switch(s->cmos_index) {
 445         case RTC_SECONDS:
 446         case RTC_MINUTES:
 447         case RTC_HOURS:
 448         case RTC_DAY_OF_WEEK:
 449         case RTC_DAY_OF_MONTH:
 450         case RTC_MONTH:
 451         case RTC_YEAR:
 452             ret = s->cmos_data[s->cmos_index];
 453             break;
 454         case RTC_REG_A:
 455             ret = s->cmos_data[s->cmos_index];
 456             break;
 457         case RTC_REG_C:
 458             ret = s->cmos_data[s->cmos_index];
 459             qemu_irq_lower(s->irq);
 460             s->cmos_data[RTC_REG_C] = 0x00;
 461             break;
 462         default:
 463             ret = s->cmos_data[s->cmos_index];
 464             break;
 465         }
 466 #ifdef DEBUG_CMOS
 467         printf("cmos: read index=0x%02x val=0x%02x\n",
 468                s->cmos_index, ret);
 469 #endif
 470         return ret;
 471     }
 472 }
 473
 474 void rtc_set_memory(RTCState *s, int addr, int val)
 475 {
 476     if (addr >= 0 && addr <= 127)
 477         s->cmos_data[addr] = val;
 478 }
 479
 480 void rtc_set_date(RTCState *s, const struct tm *tm)
 481 {
 482     s->current_tm = *tm;
 483     rtc_copy_date(s);
 484 }
 485
 486 /* PC cmos mappings */
 487 #define REG_IBM_CENTURY_BYTE        0x32
 488 #define REG_IBM_PS2_CENTURY_BYTE    0x37
 489
 490 static void rtc_set_date_from_host(RTCState *s)
 491 {
 492     struct tm tm;
 493     int val;
 494
 495     /* set the CMOS date */
 496     qemu_get_timedate(&tm, 0);
 497     rtc_set_date(s, &tm);
 498
 499     val = to_bcd(s, (tm.tm_year / 100) + 19);
 500     rtc_set_memory(s, REG_IBM_CENTURY_BYTE, val);
 501     rtc_set_memory(s, REG_IBM_PS2_CENTURY_BYTE, val);
 502 }
 503
 504 static void rtc_save(QEMUFile *f, void *opaque)
 505 {
 506     RTCState *s = opaque;
 507
 508     qemu_put_buffer(f, s->cmos_data, 128);
 509     qemu_put_8s(f, &s->cmos_index);
 510
 511     qemu_put_be32(f, s->current_tm.tm_sec);
 512     qemu_put_be32(f, s->current_tm.tm_min);
 513     qemu_put_be32(f, s->current_tm.tm_hour);
 514     qemu_put_be32(f, s->current_tm.tm_wday);
 515     qemu_put_be32(f, s->current_tm.tm_mday);
 516     qemu_put_be32(f, s->current_tm.tm_mon);
 517     qemu_put_be32(f, s->current_tm.tm_year);
 518
 519     qemu_put_timer(f, s->periodic_timer);
 520     qemu_put_be64(f, s->next_periodic_time);
 521
 522     qemu_put_be64(f, s->next_second_time);
 523     qemu_put_timer(f, s->second_timer);
 524     qemu_put_timer(f, s->second_timer2);
 525 }
 526
 527 static int rtc_load(QEMUFile *f, void *opaque, int version_id)
 528 {
 529     RTCState *s = opaque;
 530
 531     if (version_id != 1)
 532         return -EINVAL;
 533
 534     qemu_get_buffer(f, s->cmos_data, 128);
 535     qemu_get_8s(f, &s->cmos_index);
 536
 537     s->current_tm.tm_sec=qemu_get_be32(f);
 538     s->current_tm.tm_min=qemu_get_be32(f);
 539     s->current_tm.tm_hour=qemu_get_be32(f);
 540     s->current_tm.tm_wday=qemu_get_be32(f);
 541     s->current_tm.tm_mday=qemu_get_be32(f);
 542     s->current_tm.tm_mon=qemu_get_be32(f);
 543     s->current_tm.tm_year=qemu_get_be32(f);
 544
 545     qemu_get_timer(f, s->periodic_timer);
 546     s->next_periodic_time=qemu_get_be64(f);
 547
 548     s->next_second_time=qemu_get_be64(f);
 549     qemu_get_timer(f, s->second_timer);
 550     qemu_get_timer(f, s->second_timer2);
 551     return 0;
 552 }
 553
 554 #ifdef TARGET_I386
 555 static void rtc_save_td(QEMUFile *f, void *opaque)
 556 {
 557     RTCState *s = opaque;
 558
 559     qemu_put_be32(f, s->irq_coalesced);
 560     qemu_put_be32(f, s->period);
 561 }
 562
 563 static int rtc_load_td(QEMUFile *f, void *opaque, int version_id)
 564 {
 565     RTCState *s = opaque;
 566
 567     if (version_id != 1)
 568         return -EINVAL;
 569
 570     s->irq_coalesced = qemu_get_be32(f);
 571     s->period = qemu_get_be32(f);
 572     rtc_coalesced_timer_update(s);
 573     return 0;
 574 }
 575 #endif
 576
 577 static void rtc_reset(void *opaque)
 578 {
 579     RTCState *s = opaque;
 580
 581     s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE);
 582     s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF);
 583
 584     qemu_irq_lower(s->irq);
 585
 586 #ifdef TARGET_I386
 587     if (rtc_td_hack)
 588             s->irq_coalesced = 0;
 589 #endif
 590 }
 591
 592 RTCState *rtc_init_sqw(int base, qemu_irq irq, qemu_irq sqw_irq, int base_year)
 593 {
 594     RTCState *s;
 595
 596     s = qemu_mallocz(sizeof(RTCState));
 597
 598     s->irq = irq;
 599     s->sqw_irq = sqw_irq;
 600     s->cmos_data[RTC_REG_A] = 0x26;
 601     s->cmos_data[RTC_REG_B] = 0x02;
 602     s->cmos_data[RTC_REG_C] = 0x00;
 603     s->cmos_data[RTC_REG_D] = 0x80;
 604
 605     s->base_year = base_year;
 606     rtc_set_date_from_host(s);
 607
 608     s->periodic_timer = qemu_new_timer(vm_clock,
 609                                        rtc_periodic_timer, s);
 610 #ifdef TARGET_I386
 611     if (rtc_td_hack)
 612         s->coalesced_timer = qemu_new_timer(vm_clock, rtc_coalesced_timer, s);
 613 #endif
 614     s->second_timer = qemu_new_timer(vm_clock,
 615                                      rtc_update_second, s);
 616     s->second_timer2 = qemu_new_timer(vm_clock,
 617                                       rtc_update_second2, s);
 618
 619     s->next_second_time = qemu_get_clock(vm_clock) + (ticks_per_sec * 99) / 100;
 620     qemu_mod_timer(s->second_timer2, s->next_second_time);
 621
 622     register_ioport_write(base, 2, 1, cmos_ioport_write, s);
 623     register_ioport_read(base, 2, 1, cmos_ioport_read, s);
 624
 625     register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
 626 #ifdef TARGET_I386
 627     if (rtc_td_hack)
 628         register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
 629 #endif
 630     qemu_register_reset(rtc_reset, s);
 631
 632     return s;
 633 }
 634
 635 RTCState *rtc_init(int base, qemu_irq irq, int base_year)
 636 {
 637     return rtc_init_sqw(base, irq, NULL, base_year);
 638 }
 639
 640 /* Memory mapped interface */
 641 static uint32_t cmos_mm_readb (void *opaque, target_phys_addr_t addr)
 642 {
 643     RTCState *s = opaque;
 644
 645     return cmos_ioport_read(s, addr >> s->it_shift) & 0xFF;
 646 }
 647
 648 static void cmos_mm_writeb (void *opaque,
 649                             target_phys_addr_t addr, uint32_t value)
 650 {
 651     RTCState *s = opaque;
 652
 653     cmos_ioport_write(s, addr >> s->it_shift, value & 0xFF);
 654 }
 655
 656 static uint32_t cmos_mm_readw (void *opaque, target_phys_addr_t addr)
 657 {
 658     RTCState *s = opaque;
 659     uint32_t val;
 660
 661     val = cmos_ioport_read(s, addr >> s->it_shift) & 0xFFFF;
 662 #ifdef TARGET_WORDS_BIGENDIAN
 663     val = bswap16(val);
 664 #endif
 665     return val;
 666 }
 667
 668 static void cmos_mm_writew (void *opaque,
 669                             target_phys_addr_t addr, uint32_t value)
 670 {
 671     RTCState *s = opaque;
 672 #ifdef TARGET_WORDS_BIGENDIAN
 673     value = bswap16(value);
 674 #endif
 675     cmos_ioport_write(s, addr >> s->it_shift, value & 0xFFFF);
 676 }
 677
 678 static uint32_t cmos_mm_readl (void *opaque, target_phys_addr_t addr)
 679 {
 680     RTCState *s = opaque;
 681     uint32_t val;
 682
 683     val = cmos_ioport_read(s, addr >> s->it_shift);
 684 #ifdef TARGET_WORDS_BIGENDIAN
 685     val = bswap32(val);
 686 #endif
 687     return val;
 688 }
 689
 690 static void cmos_mm_writel (void *opaque,
 691                             target_phys_addr_t addr, uint32_t value)
 692 {
 693     RTCState *s = opaque;
 694 #ifdef TARGET_WORDS_BIGENDIAN
 695     value = bswap32(value);
 696 #endif
 697     cmos_ioport_write(s, addr >> s->it_shift, value);
 698 }
 699
 700 static CPUReadMemoryFunc *rtc_mm_read[] = {
 701     &cmos_mm_readb,
 702     &cmos_mm_readw,
 703     &cmos_mm_readl,
 704 };
 705
 706 static CPUWriteMemoryFunc *rtc_mm_write[] = {
 707     &cmos_mm_writeb,
 708     &cmos_mm_writew,
 709     &cmos_mm_writel,
 710 };
 711
 712 RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq,
 713                       int base_year)
 714 {
 715     RTCState *s;
 716     int io_memory;
 717
 718     s = qemu_mallocz(sizeof(RTCState));
 719
 720     s->irq = irq;
 721     s->cmos_data[RTC_REG_A] = 0x26;
 722     s->cmos_data[RTC_REG_B] = 0x02;
 723     s->cmos_data[RTC_REG_C] = 0x00;
 724     s->cmos_data[RTC_REG_D] = 0x80;
 725
 726     s->base_year = base_year;
 727     rtc_set_date_from_host(s);
 728
 729     s->periodic_timer = qemu_new_timer(vm_clock,
 730                                        rtc_periodic_timer, s);
 731     s->second_timer = qemu_new_timer(vm_clock,
 732                                      rtc_update_second, s);
 733     s->second_timer2 = qemu_new_timer(vm_clock,
 734                                       rtc_update_second2, s);
 735
 736     s->next_second_time = qemu_get_clock(vm_clock) + (ticks_per_sec * 99) / 100;
 737     qemu_mod_timer(s->second_timer2, s->next_second_time);
 738
 739     io_memory = cpu_register_io_memory(rtc_mm_read, rtc_mm_write, s);
 740     cpu_register_physical_memory(base, 2 << it_shift, io_memory);
 741
 742     register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
 743 #ifdef TARGET_I386
 744     if (rtc_td_hack)
 745         register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, s);
 746 #endif
 747     qemu_register_reset(rtc_reset, s);
 748     return s;
 749 }