hw/acpi/core.c

   1 /*
   2  * ACPI implementation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License version 2 as published by the Free Software Foundation.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  17  *
  18  * Contributions after 2012-01-13 are licensed under the terms of the
  19  * GNU GPL, version 2 or (at your option) any later version.
  20  */
  21 #include "sysemu/sysemu.h"
  22 #include "hw/hw.h"
  23 #include "hw/i386/pc.h"
  24 #include "hw/acpi/acpi.h"
  25 #include "monitor/monitor.h"
  26 #include "qemu/config-file.h"
  27 #include "qapi/opts-visitor.h"
  28 #include "qapi/dealloc-visitor.h"
  29 #include "qapi-visit.h"
  30
  31 struct acpi_table_header {
  32     uint16_t _length;         /* our length, not actual part of the hdr */
  33                               /* allows easier parsing for fw_cfg clients */
  34     char sig[4];              /* ACPI signature (4 ASCII characters) */
  35     uint32_t length;          /* Length of table, in bytes, including header */
  36     uint8_t revision;         /* ACPI Specification minor version # */
  37     uint8_t checksum;         /* To make sum of entire table == 0 */
  38     char oem_id[6];           /* OEM identification */
  39     char oem_table_id[8];     /* OEM table identification */
  40     uint32_t oem_revision;    /* OEM revision number */
  41     char asl_compiler_id[4];  /* ASL compiler vendor ID */
  42     uint32_t asl_compiler_revision; /* ASL compiler revision number */
  43 } QEMU_PACKED;
  44
  45 #define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
  46 #define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */
  47
  48 static const char unsigned dfl_hdr[ACPI_TABLE_HDR_SIZE - ACPI_TABLE_PFX_SIZE] =
  49     "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */
  50     "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
  51     "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */
  52     ;
  53
  54 char unsigned *acpi_tables;
  55 size_t acpi_tables_len;
  56
  57 static QemuOptsList qemu_acpi_opts = {
  58     .name = "acpi",
  59     .implied_opt_name = "data",
  60     .head = QTAILQ_HEAD_INITIALIZER(qemu_acpi_opts.head),
  61     .desc = { { 0 } } /* validated with OptsVisitor */
  62 };
  63
  64 static void acpi_register_config(void)
  65 {
  66     qemu_add_opts(&qemu_acpi_opts);
  67 }
  68
  69 machine_init(acpi_register_config);
  70
  71 static int acpi_checksum(const uint8_t *data, int len)
  72 {
  73     int sum, i;
  74     sum = 0;
  75     for (i = 0; i < len; i++) {
  76         sum += data[i];
  77     }
  78     return (-sum) & 0xff;
  79 }
  80
  81
  82 /* Install a copy of the ACPI table specified in @blob.
  83  *
  84  * If @has_header is set, @blob starts with the System Description Table Header
  85  * structure. Otherwise, "dfl_hdr" is prepended. In any case, each header field
  86  * is optionally overwritten from @hdrs.
  87  *
  88  * It is valid to call this function with
  89  * (@blob == NULL && bloblen == 0 && !has_header).
  90  *
  91  * @hdrs->file and @hdrs->data are ignored.
  92  *
  93  * SIZE_MAX is considered "infinity" in this function.
  94  *
  95  * The number of tables that can be installed is not limited, but the 16-bit
  96  * counter at the beginning of "acpi_tables" wraps around after UINT16_MAX.
  97  */
  98 static void acpi_table_install(const char unsigned *blob, size_t bloblen,
  99                                bool has_header,
 100                                const struct AcpiTableOptions *hdrs,
 101                                Error **errp)
 102 {
 103     size_t body_start;
 104     const char unsigned *hdr_src;
 105     size_t body_size, acpi_payload_size;
 106     struct acpi_table_header *ext_hdr;
 107     unsigned changed_fields;
 108
 109     /* Calculate where the ACPI table body starts within the blob, plus where
 110      * to copy the ACPI table header from.
 111      */
 112     if (has_header) {
 113         /*   _length             | ACPI header in blob | blob body
 114          *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^
 115          *   ACPI_TABLE_PFX_SIZE     sizeof dfl_hdr      body_size
 116          *                           == body_start
 117          *
 118          *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 119          *                           acpi_payload_size == bloblen
 120          */
 121         body_start = sizeof dfl_hdr;
 122
 123         if (bloblen < body_start) {
 124             error_setg(errp, "ACPI table claiming to have header is too "
 125                        "short, available: %zu, expected: %zu", bloblen,
 126                        body_start);
 127             return;
 128         }
 129         hdr_src = blob;
 130     } else {
 131         /*   _length             | ACPI header in template | blob body
 132          *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^
 133          *   ACPI_TABLE_PFX_SIZE       sizeof dfl_hdr        body_size
 134          *                                                   == bloblen
 135          *
 136          *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 137          *                                  acpi_payload_size
 138          */
 139         body_start = 0;
 140         hdr_src = dfl_hdr;
 141     }
 142     body_size = bloblen - body_start;
 143     acpi_payload_size = sizeof dfl_hdr + body_size;
 144
 145     if (acpi_payload_size > UINT16_MAX) {
 146         error_setg(errp, "ACPI table too big, requested: %zu, max: %u",
 147                    acpi_payload_size, (unsigned)UINT16_MAX);
 148         return;
 149     }
 150
 151     /* We won't fail from here on. Initialize / extend the globals. */
 152     if (acpi_tables == NULL) {
 153         acpi_tables_len = sizeof(uint16_t);
 154         acpi_tables = g_malloc0(acpi_tables_len);
 155     }
 156
 157     acpi_tables = g_realloc(acpi_tables, acpi_tables_len +
 158                                          ACPI_TABLE_PFX_SIZE +
 159                                          sizeof dfl_hdr + body_size);
 160
 161     ext_hdr = (struct acpi_table_header *)(acpi_tables + acpi_tables_len);
 162     acpi_tables_len += ACPI_TABLE_PFX_SIZE;
 163
 164     memcpy(acpi_tables + acpi_tables_len, hdr_src, sizeof dfl_hdr);
 165     acpi_tables_len += sizeof dfl_hdr;
 166
 167     if (blob != NULL) {
 168         memcpy(acpi_tables + acpi_tables_len, blob + body_start, body_size);
 169         acpi_tables_len += body_size;
 170     }
 171
 172     /* increase number of tables */
 173     stw_le_p(acpi_tables, lduw_le_p(acpi_tables) + 1u);
 174
 175     /* Update the header fields. The strings need not be NUL-terminated. */
 176     changed_fields = 0;
 177     ext_hdr->_length = cpu_to_le16(acpi_payload_size);
 178
 179     if (hdrs->has_sig) {
 180         strncpy(ext_hdr->sig, hdrs->sig, sizeof ext_hdr->sig);
 181         ++changed_fields;
 182     }
 183
 184     if (has_header && le32_to_cpu(ext_hdr->length) != acpi_payload_size) {
 185         fprintf(stderr,
 186                 "warning: ACPI table has wrong length, header says "
 187                 "%" PRIu32 ", actual size %zu bytes\n",
 188                 le32_to_cpu(ext_hdr->length), acpi_payload_size);
 189     }
 190     ext_hdr->length = cpu_to_le32(acpi_payload_size);
 191
 192     if (hdrs->has_rev) {
 193         ext_hdr->revision = hdrs->rev;
 194         ++changed_fields;
 195     }
 196
 197     ext_hdr->checksum = 0;
 198
 199     if (hdrs->has_oem_id) {
 200         strncpy(ext_hdr->oem_id, hdrs->oem_id, sizeof ext_hdr->oem_id);
 201         ++changed_fields;
 202     }
 203     if (hdrs->has_oem_table_id) {
 204         strncpy(ext_hdr->oem_table_id, hdrs->oem_table_id,
 205                 sizeof ext_hdr->oem_table_id);
 206         ++changed_fields;
 207     }
 208     if (hdrs->has_oem_rev) {
 209         ext_hdr->oem_revision = cpu_to_le32(hdrs->oem_rev);
 210         ++changed_fields;
 211     }
 212     if (hdrs->has_asl_compiler_id) {
 213         strncpy(ext_hdr->asl_compiler_id, hdrs->asl_compiler_id,
 214                 sizeof ext_hdr->asl_compiler_id);
 215         ++changed_fields;
 216     }
 217     if (hdrs->has_asl_compiler_rev) {
 218         ext_hdr->asl_compiler_revision = cpu_to_le32(hdrs->asl_compiler_rev);
 219         ++changed_fields;
 220     }
 221
 222     if (!has_header && changed_fields == 0) {
 223         fprintf(stderr, "warning: ACPI table: no headers are specified\n");
 224     }
 225
 226     /* recalculate checksum */
 227     ext_hdr->checksum = acpi_checksum((const char unsigned *)ext_hdr +
 228                                       ACPI_TABLE_PFX_SIZE, acpi_payload_size);
 229 }
 230
 231 void acpi_table_add(const QemuOpts *opts, Error **errp)
 232 {
 233     AcpiTableOptions *hdrs = NULL;
 234     Error *err = NULL;
 235     char **pathnames = NULL;
 236     char **cur;
 237     size_t bloblen = 0;
 238     char unsigned *blob = NULL;
 239
 240     {
 241         OptsVisitor *ov;
 242
 243         ov = opts_visitor_new(opts);
 244         visit_type_AcpiTableOptions(opts_get_visitor(ov), &hdrs, NULL, &err);
 245         opts_visitor_cleanup(ov);
 246     }
 247
 248     if (err) {
 249         goto out;
 250     }
 251     if (hdrs->has_file == hdrs->has_data) {
 252         error_setg(&err, "'-acpitable' requires one of 'data' or 'file'");
 253         goto out;
 254     }
 255
 256     pathnames = g_strsplit(hdrs->has_file ? hdrs->file : hdrs->data, ":", 0);
 257     if (pathnames == NULL || pathnames[0] == NULL) {
 258         error_setg(&err, "'-acpitable' requires at least one pathname");
 259         goto out;
 260     }
 261
 262     /* now read in the data files, reallocating buffer as needed */
 263     for (cur = pathnames; *cur; ++cur) {
 264         int fd = open(*cur, O_RDONLY | O_BINARY);
 265
 266         if (fd < 0) {
 267             error_setg(&err, "can't open file %s: %s", *cur, strerror(errno));
 268             goto out;
 269         }
 270
 271         for (;;) {
 272             char unsigned data[8192];
 273             ssize_t r;
 274
 275             r = read(fd, data, sizeof data);
 276             if (r == 0) {
 277                 break;
 278             } else if (r > 0) {
 279                 blob = g_realloc(blob, bloblen + r);
 280                 memcpy(blob + bloblen, data, r);
 281                 bloblen += r;
 282             } else if (errno != EINTR) {
 283                 error_setg(&err, "can't read file %s: %s",
 284                            *cur, strerror(errno));
 285                 close(fd);
 286                 goto out;
 287             }
 288         }
 289
 290         close(fd);
 291     }
 292
 293     acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, &err);
 294
 295 out:
 296     g_free(blob);
 297     g_strfreev(pathnames);
 298
 299     if (hdrs != NULL) {
 300         QapiDeallocVisitor *dv;
 301
 302         dv = qapi_dealloc_visitor_new();
 303         visit_type_AcpiTableOptions(qapi_dealloc_get_visitor(dv), &hdrs, NULL,
 304                                     NULL);
 305         qapi_dealloc_visitor_cleanup(dv);
 306     }
 307
 308     error_propagate(errp, err);
 309 }
 310
 311 static bool acpi_table_builtin = false;
 312
 313 void acpi_table_add_builtin(const QemuOpts *opts, Error **errp)
 314 {
 315     acpi_table_builtin = true;
 316     acpi_table_add(opts, errp);
 317 }
 318
 319 unsigned acpi_table_len(void *current)
 320 {
 321     struct acpi_table_header *hdr = current - sizeof(hdr->_length);
 322     return hdr->_length;
 323 }
 324
 325 static
 326 void *acpi_table_hdr(void *h)
 327 {
 328     struct acpi_table_header *hdr = h;
 329     return &hdr->sig;
 330 }
 331
 332 uint8_t *acpi_table_first(void)
 333 {
 334     if (acpi_table_builtin || !acpi_tables) {
 335         return NULL;
 336     }
 337     return acpi_table_hdr(acpi_tables + ACPI_TABLE_PFX_SIZE);
 338 }
 339
 340 uint8_t *acpi_table_next(uint8_t *current)
 341 {
 342     uint8_t *next = current + acpi_table_len(current);
 343
 344     if (next - acpi_tables >= acpi_tables_len) {
 345         return NULL;
 346     } else {
 347         return acpi_table_hdr(next);
 348     }
 349 }
 350
 351 static void acpi_notify_wakeup(Notifier *notifier, void *data)
 352 {
 353     ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
 354     WakeupReason *reason = data;
 355
 356     switch (*reason) {
 357     case QEMU_WAKEUP_REASON_RTC:
 358         ar->pm1.evt.sts |=
 359             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
 360         break;
 361     case QEMU_WAKEUP_REASON_PMTIMER:
 362         ar->pm1.evt.sts |=
 363             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
 364         break;
 365     case QEMU_WAKEUP_REASON_OTHER:
 366         /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
 367            Pretend that resume was caused by power button */
 368         ar->pm1.evt.sts |=
 369             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
 370         break;
 371     default:
 372         break;
 373     }
 374 }
 375
 376 /* ACPI PM1a EVT */
 377 uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
 378 {
 379     int64_t d = acpi_pm_tmr_get_clock();
 380     if (d >= ar->tmr.overflow_time) {
 381         ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
 382     }
 383     return ar->pm1.evt.sts;
 384 }
 385
 386 static void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
 387 {
 388     uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
 389     if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
 390         /* if TMRSTS is reset, then compute the new overflow time */
 391         acpi_pm_tmr_calc_overflow_time(ar);
 392     }
 393     ar->pm1.evt.sts &= ~val;
 394 }
 395
 396 static void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
 397 {
 398     ar->pm1.evt.en = val;
 399     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
 400                               val & ACPI_BITMASK_RT_CLOCK_ENABLE);
 401     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
 402                               val & ACPI_BITMASK_TIMER_ENABLE);
 403 }
 404
 405 void acpi_pm1_evt_power_down(ACPIREGS *ar)
 406 {
 407     if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
 408         ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
 409         ar->tmr.update_sci(ar);
 410     }
 411 }
 412
 413 void acpi_pm1_evt_reset(ACPIREGS *ar)
 414 {
 415     ar->pm1.evt.sts = 0;
 416     ar->pm1.evt.en = 0;
 417     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
 418     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
 419 }
 420
 421 static uint64_t acpi_pm_evt_read(void *opaque, hwaddr addr, unsigned width)
 422 {
 423     ACPIREGS *ar = opaque;
 424     switch (addr) {
 425     case 0:
 426         return acpi_pm1_evt_get_sts(ar);
 427     case 2:
 428         return ar->pm1.evt.en;
 429     default:
 430         return 0;
 431     }
 432 }
 433
 434 static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
 435                               unsigned width)
 436 {
 437     ACPIREGS *ar = opaque;
 438     switch (addr) {
 439     case 0:
 440         acpi_pm1_evt_write_sts(ar, val);
 441         ar->pm1.evt.update_sci(ar);
 442         break;
 443     case 2:
 444         acpi_pm1_evt_write_en(ar, val);
 445         ar->pm1.evt.update_sci(ar);
 446         break;
 447     }
 448 }
 449
 450 static const MemoryRegionOps acpi_pm_evt_ops = {
 451     .read = acpi_pm_evt_read,
 452     .write = acpi_pm_evt_write,
 453     .valid.min_access_size = 2,
 454     .valid.max_access_size = 2,
 455     .endianness = DEVICE_LITTLE_ENDIAN,
 456 };
 457
 458 void acpi_pm1_evt_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 459                        MemoryRegion *parent)
 460 {
 461     ar->pm1.evt.update_sci = update_sci;
 462     memory_region_init_io(&ar->pm1.evt.io, memory_region_owner(parent),
 463                           &acpi_pm_evt_ops, ar, "acpi-evt", 4);
 464     memory_region_add_subregion(parent, 0, &ar->pm1.evt.io);
 465 }
 466
 467 /* ACPI PM_TMR */
 468 void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)
 469 {
 470     int64_t expire_time;
 471
 472     /* schedule a timer interruption if needed */
 473     if (enable) {
 474         expire_time = muldiv64(ar->tmr.overflow_time, get_ticks_per_sec(),
 475                                PM_TIMER_FREQUENCY);
 476         timer_mod(ar->tmr.timer, expire_time);
 477     } else {
 478         timer_del(ar->tmr.timer);
 479     }
 480 }
 481
 482 void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
 483 {
 484     int64_t d = acpi_pm_tmr_get_clock();
 485     ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 486 }
 487
 488 static uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 489 {
 490     uint32_t d = acpi_pm_tmr_get_clock();
 491     return d & 0xffffff;
 492 }
 493
 494 static void acpi_pm_tmr_timer(void *opaque)
 495 {
 496     ACPIREGS *ar = opaque;
 497     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER);
 498     ar->tmr.update_sci(ar);
 499 }
 500
 501 static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
 502 {
 503     return acpi_pm_tmr_get(opaque);
 504 }
 505
 506 static void acpi_pm_tmr_write(void *opaque, hwaddr addr, uint64_t val,
 507                               unsigned width)
 508 {
 509     /* nothing */
 510 }
 511
 512 static const MemoryRegionOps acpi_pm_tmr_ops = {
 513     .read = acpi_pm_tmr_read,
 514     .write = acpi_pm_tmr_write,
 515     .valid.min_access_size = 4,
 516     .valid.max_access_size = 4,
 517     .endianness = DEVICE_LITTLE_ENDIAN,
 518 };
 519
 520 void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 521                       MemoryRegion *parent)
 522 {
 523     ar->tmr.update_sci = update_sci;
 524     ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar);
 525     memory_region_init_io(&ar->tmr.io, memory_region_owner(parent),
 526                           &acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
 527     memory_region_add_subregion(parent, 8, &ar->tmr.io);
 528 }
 529
 530 void acpi_pm_tmr_reset(ACPIREGS *ar)
 531 {
 532     ar->tmr.overflow_time = 0;
 533     timer_del(ar->tmr.timer);
 534 }
 535
 536 /* ACPI PM1aCNT */
 537 static void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val)
 538 {
 539     ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
 540
 541     if (val & ACPI_BITMASK_SLEEP_ENABLE) {
 542         /* change suspend type */
 543         uint16_t sus_typ = (val >> 10) & 7;
 544         switch(sus_typ) {
 545         case 0: /* soft power off */
 546             qemu_system_shutdown_request();
 547             break;
 548         case 1:
 549             qemu_system_suspend_request();
 550             break;
 551         default:
 552             if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */
 553                 monitor_protocol_event(QEVENT_SUSPEND_DISK, NULL);
 554                 qemu_system_shutdown_request();
 555             }
 556             break;
 557         }
 558     }
 559 }
 560
 561 void acpi_pm1_cnt_update(ACPIREGS *ar,
 562                          bool sci_enable, bool sci_disable)
 563 {
 564     /* ACPI specs 3.0, 4.7.2.5 */
 565     if (sci_enable) {
 566         ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 567     } else if (sci_disable) {
 568         ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
 569     }
 570 }
 571
 572 static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width)
 573 {
 574     ACPIREGS *ar = opaque;
 575     return ar->pm1.cnt.cnt;
 576 }
 577
 578 static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
 579                               unsigned width)
 580 {
 581     acpi_pm1_cnt_write(opaque, val);
 582 }
 583
 584 static const MemoryRegionOps acpi_pm_cnt_ops = {
 585     .read = acpi_pm_cnt_read,
 586     .write = acpi_pm_cnt_write,
 587     .valid.min_access_size = 2,
 588     .valid.max_access_size = 2,
 589     .endianness = DEVICE_LITTLE_ENDIAN,
 590 };
 591
 592 void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent, uint8_t s4_val)
 593 {
 594     ar->pm1.cnt.s4_val = s4_val;
 595     ar->wakeup.notify = acpi_notify_wakeup;
 596     qemu_register_wakeup_notifier(&ar->wakeup);
 597     memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
 598                           &acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
 599     memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
 600 }
 601
 602 void acpi_pm1_cnt_reset(ACPIREGS *ar)
 603 {
 604     ar->pm1.cnt.cnt = 0;
 605 }
 606
 607 /* ACPI GPE */
 608 void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
 609 {
 610     ar->gpe.len = len;
 611     ar->gpe.sts = g_malloc0(len / 2);
 612     ar->gpe.en = g_malloc0(len / 2);
 613 }
 614
 615 void acpi_gpe_reset(ACPIREGS *ar)
 616 {
 617     memset(ar->gpe.sts, 0, ar->gpe.len / 2);
 618     memset(ar->gpe.en, 0, ar->gpe.len / 2);
 619 }
 620
 621 static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
 622 {
 623     uint8_t *cur = NULL;
 624
 625     if (addr < ar->gpe.len / 2) {
 626         cur = ar->gpe.sts + addr;
 627     } else if (addr < ar->gpe.len) {
 628         cur = ar->gpe.en + addr - ar->gpe.len / 2;
 629     } else {
 630         abort();
 631     }
 632
 633     return cur;
 634 }
 635
 636 void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
 637 {
 638     uint8_t *cur;
 639
 640     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 641     if (addr < ar->gpe.len / 2) {
 642         /* GPE_STS */
 643         *cur = (*cur) & ~val;
 644     } else if (addr < ar->gpe.len) {
 645         /* GPE_EN */
 646         *cur = val;
 647     } else {
 648         abort();
 649     }
 650 }
 651
 652 uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
 653 {
 654     uint8_t *cur;
 655     uint32_t val;
 656
 657     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 658     val = 0;
 659     if (cur != NULL) {
 660         val = *cur;
 661     }
 662
 663     return val;
 664 }
 665
 666 void acpi_update_sci(ACPIREGS *regs, qemu_irq irq)
 667 {
 668     int sci_level, pm1a_sts;
 669
 670     pm1a_sts = acpi_pm1_evt_get_sts(regs);
 671
 672     sci_level = ((pm1a_sts &
 673                   regs->pm1.evt.en & ACPI_BITMASK_PM1_COMMON_ENABLED) != 0) ||
 674                 ((regs->gpe.sts[0] & regs->gpe.en[0]) != 0);
 675
 676     qemu_set_irq(irq, sci_level);
 677
 678     /* schedule a timer interruption if needed */
 679     acpi_pm_tmr_update(regs,
 680                        (regs->pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
 681                        !(pm1a_sts & ACPI_BITMASK_TIMER_STATUS));
 682 }