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     cpu_to_le16wu((uint16_t *)acpi_tables,
 174                   le16_to_cpupu((uint16_t *)acpi_tables) + 1u);
 175
 176     /* Update the header fields. The strings need not be NUL-terminated. */
 177     changed_fields = 0;
 178     ext_hdr->_length = cpu_to_le16(acpi_payload_size);
 179
 180     if (hdrs->has_sig) {
 181         strncpy(ext_hdr->sig, hdrs->sig, sizeof ext_hdr->sig);
 182         ++changed_fields;
 183     }
 184
 185     if (has_header && le32_to_cpu(ext_hdr->length) != acpi_payload_size) {
 186         fprintf(stderr,
 187                 "warning: ACPI table has wrong length, header says "
 188                 "%" PRIu32 ", actual size %zu bytes\n",
 189                 le32_to_cpu(ext_hdr->length), acpi_payload_size);
 190     }
 191     ext_hdr->length = cpu_to_le32(acpi_payload_size);
 192
 193     if (hdrs->has_rev) {
 194         ext_hdr->revision = hdrs->rev;
 195         ++changed_fields;
 196     }
 197
 198     ext_hdr->checksum = 0;
 199
 200     if (hdrs->has_oem_id) {
 201         strncpy(ext_hdr->oem_id, hdrs->oem_id, sizeof ext_hdr->oem_id);
 202         ++changed_fields;
 203     }
 204     if (hdrs->has_oem_table_id) {
 205         strncpy(ext_hdr->oem_table_id, hdrs->oem_table_id,
 206                 sizeof ext_hdr->oem_table_id);
 207         ++changed_fields;
 208     }
 209     if (hdrs->has_oem_rev) {
 210         ext_hdr->oem_revision = cpu_to_le32(hdrs->oem_rev);
 211         ++changed_fields;
 212     }
 213     if (hdrs->has_asl_compiler_id) {
 214         strncpy(ext_hdr->asl_compiler_id, hdrs->asl_compiler_id,
 215                 sizeof ext_hdr->asl_compiler_id);
 216         ++changed_fields;
 217     }
 218     if (hdrs->has_asl_compiler_rev) {
 219         ext_hdr->asl_compiler_revision = cpu_to_le32(hdrs->asl_compiler_rev);
 220         ++changed_fields;
 221     }
 222
 223     if (!has_header && changed_fields == 0) {
 224         fprintf(stderr, "warning: ACPI table: no headers are specified\n");
 225     }
 226
 227     /* recalculate checksum */
 228     ext_hdr->checksum = acpi_checksum((const char unsigned *)ext_hdr +
 229                                       ACPI_TABLE_PFX_SIZE, acpi_payload_size);
 230 }
 231
 232 void acpi_table_add(const QemuOpts *opts, Error **errp)
 233 {
 234     AcpiTableOptions *hdrs = NULL;
 235     Error *err = NULL;
 236     char **pathnames = NULL;
 237     char **cur;
 238     size_t bloblen = 0;
 239     char unsigned *blob = NULL;
 240
 241     {
 242         OptsVisitor *ov;
 243
 244         ov = opts_visitor_new(opts);
 245         visit_type_AcpiTableOptions(opts_get_visitor(ov), &hdrs, NULL, &err);
 246         opts_visitor_cleanup(ov);
 247     }
 248
 249     if (err) {
 250         goto out;
 251     }
 252     if (hdrs->has_file == hdrs->has_data) {
 253         error_setg(&err, "'-acpitable' requires one of 'data' or 'file'");
 254         goto out;
 255     }
 256
 257     pathnames = g_strsplit(hdrs->has_file ? hdrs->file : hdrs->data, ":", 0);
 258     if (pathnames == NULL || pathnames[0] == NULL) {
 259         error_setg(&err, "'-acpitable' requires at least one pathname");
 260         goto out;
 261     }
 262
 263     /* now read in the data files, reallocating buffer as needed */
 264     for (cur = pathnames; *cur; ++cur) {
 265         int fd = open(*cur, O_RDONLY | O_BINARY);
 266
 267         if (fd < 0) {
 268             error_setg(&err, "can't open file %s: %s", *cur, strerror(errno));
 269             goto out;
 270         }
 271
 272         for (;;) {
 273             char unsigned data[8192];
 274             ssize_t r;
 275
 276             r = read(fd, data, sizeof data);
 277             if (r == 0) {
 278                 break;
 279             } else if (r > 0) {
 280                 blob = g_realloc(blob, bloblen + r);
 281                 memcpy(blob + bloblen, data, r);
 282                 bloblen += r;
 283             } else if (errno != EINTR) {
 284                 error_setg(&err, "can't read file %s: %s",
 285                            *cur, strerror(errno));
 286                 close(fd);
 287                 goto out;
 288             }
 289         }
 290
 291         close(fd);
 292     }
 293
 294     acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, &err);
 295
 296 out:
 297     g_free(blob);
 298     g_strfreev(pathnames);
 299
 300     if (hdrs != NULL) {
 301         QapiDeallocVisitor *dv;
 302
 303         dv = qapi_dealloc_visitor_new();
 304         visit_type_AcpiTableOptions(qapi_dealloc_get_visitor(dv), &hdrs, NULL,
 305                                     NULL);
 306         qapi_dealloc_visitor_cleanup(dv);
 307     }
 308
 309     error_propagate(errp, err);
 310 }
 311
 312 static bool acpi_table_builtin = false;
 313
 314 void acpi_table_add_builtin(const QemuOpts *opts, Error **errp)
 315 {
 316     acpi_table_builtin = true;
 317     acpi_table_add(opts, errp);
 318 }
 319
 320 unsigned acpi_table_len(void *current)
 321 {
 322     struct acpi_table_header *hdr = current - sizeof(hdr->_length);
 323     return hdr->_length;
 324 }
 325
 326 static
 327 void *acpi_table_hdr(void *h)
 328 {
 329     struct acpi_table_header *hdr = h;
 330     return &hdr->sig;
 331 }
 332
 333 uint8_t *acpi_table_first(void)
 334 {
 335     if (acpi_table_builtin || !acpi_tables) {
 336         return NULL;
 337     }
 338     return acpi_table_hdr(acpi_tables + ACPI_TABLE_PFX_SIZE);
 339 }
 340
 341 uint8_t *acpi_table_next(uint8_t *current)
 342 {
 343     uint8_t *next = current + acpi_table_len(current);
 344
 345     if (next - acpi_tables >= acpi_tables_len) {
 346         return NULL;
 347     } else {
 348         return acpi_table_hdr(next);
 349     }
 350 }
 351
 352 static void acpi_notify_wakeup(Notifier *notifier, void *data)
 353 {
 354     ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
 355     WakeupReason *reason = data;
 356
 357     switch (*reason) {
 358     case QEMU_WAKEUP_REASON_RTC:
 359         ar->pm1.evt.sts |=
 360             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
 361         break;
 362     case QEMU_WAKEUP_REASON_PMTIMER:
 363         ar->pm1.evt.sts |=
 364             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
 365         break;
 366     case QEMU_WAKEUP_REASON_OTHER:
 367         /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
 368            Pretend that resume was caused by power button */
 369         ar->pm1.evt.sts |=
 370             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
 371         break;
 372     default:
 373         break;
 374     }
 375 }
 376
 377 /* ACPI PM1a EVT */
 378 uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
 379 {
 380     int64_t d = acpi_pm_tmr_get_clock();
 381     if (d >= ar->tmr.overflow_time) {
 382         ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
 383     }
 384     return ar->pm1.evt.sts;
 385 }
 386
 387 static void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
 388 {
 389     uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
 390     if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
 391         /* if TMRSTS is reset, then compute the new overflow time */
 392         acpi_pm_tmr_calc_overflow_time(ar);
 393     }
 394     ar->pm1.evt.sts &= ~val;
 395 }
 396
 397 static void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
 398 {
 399     ar->pm1.evt.en = val;
 400     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
 401                               val & ACPI_BITMASK_RT_CLOCK_ENABLE);
 402     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
 403                               val & ACPI_BITMASK_TIMER_ENABLE);
 404 }
 405
 406 void acpi_pm1_evt_power_down(ACPIREGS *ar)
 407 {
 408     if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
 409         ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
 410         ar->tmr.update_sci(ar);
 411     }
 412 }
 413
 414 void acpi_pm1_evt_reset(ACPIREGS *ar)
 415 {
 416     ar->pm1.evt.sts = 0;
 417     ar->pm1.evt.en = 0;
 418     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
 419     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
 420 }
 421
 422 static uint64_t acpi_pm_evt_read(void *opaque, hwaddr addr, unsigned width)
 423 {
 424     ACPIREGS *ar = opaque;
 425     switch (addr) {
 426     case 0:
 427         return acpi_pm1_evt_get_sts(ar);
 428     case 2:
 429         return ar->pm1.evt.en;
 430     default:
 431         return 0;
 432     }
 433 }
 434
 435 static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
 436                               unsigned width)
 437 {
 438     ACPIREGS *ar = opaque;
 439     switch (addr) {
 440     case 0:
 441         acpi_pm1_evt_write_sts(ar, val);
 442         ar->pm1.evt.update_sci(ar);
 443         break;
 444     case 2:
 445         acpi_pm1_evt_write_en(ar, val);
 446         ar->pm1.evt.update_sci(ar);
 447         break;
 448     }
 449 }
 450
 451 static const MemoryRegionOps acpi_pm_evt_ops = {
 452     .read = acpi_pm_evt_read,
 453     .write = acpi_pm_evt_write,
 454     .valid.min_access_size = 2,
 455     .valid.max_access_size = 2,
 456     .endianness = DEVICE_LITTLE_ENDIAN,
 457 };
 458
 459 void acpi_pm1_evt_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 460                        MemoryRegion *parent)
 461 {
 462     ar->pm1.evt.update_sci = update_sci;
 463     memory_region_init_io(&ar->pm1.evt.io, memory_region_owner(parent),
 464                           &acpi_pm_evt_ops, ar, "acpi-evt", 4);
 465     memory_region_add_subregion(parent, 0, &ar->pm1.evt.io);
 466 }
 467
 468 /* ACPI PM_TMR */
 469 void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)
 470 {
 471     int64_t expire_time;
 472
 473     /* schedule a timer interruption if needed */
 474     if (enable) {
 475         expire_time = muldiv64(ar->tmr.overflow_time, get_ticks_per_sec(),
 476                                PM_TIMER_FREQUENCY);
 477         timer_mod(ar->tmr.timer, expire_time);
 478     } else {
 479         timer_del(ar->tmr.timer);
 480     }
 481 }
 482
 483 void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
 484 {
 485     int64_t d = acpi_pm_tmr_get_clock();
 486     ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 487 }
 488
 489 static uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 490 {
 491     uint32_t d = acpi_pm_tmr_get_clock();
 492     return d & 0xffffff;
 493 }
 494
 495 static void acpi_pm_tmr_timer(void *opaque)
 496 {
 497     ACPIREGS *ar = opaque;
 498     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER);
 499     ar->tmr.update_sci(ar);
 500 }
 501
 502 static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
 503 {
 504     return acpi_pm_tmr_get(opaque);
 505 }
 506
 507 static void acpi_pm_tmr_write(void *opaque, hwaddr addr, uint64_t val,
 508                               unsigned width)
 509 {
 510     /* nothing */
 511 }
 512
 513 static const MemoryRegionOps acpi_pm_tmr_ops = {
 514     .read = acpi_pm_tmr_read,
 515     .write = acpi_pm_tmr_write,
 516     .valid.min_access_size = 4,
 517     .valid.max_access_size = 4,
 518     .endianness = DEVICE_LITTLE_ENDIAN,
 519 };
 520
 521 void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 522                       MemoryRegion *parent)
 523 {
 524     ar->tmr.update_sci = update_sci;
 525     ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar);
 526     memory_region_init_io(&ar->tmr.io, memory_region_owner(parent),
 527                           &acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
 528     memory_region_add_subregion(parent, 8, &ar->tmr.io);
 529 }
 530
 531 void acpi_pm_tmr_reset(ACPIREGS *ar)
 532 {
 533     ar->tmr.overflow_time = 0;
 534     timer_del(ar->tmr.timer);
 535 }
 536
 537 /* ACPI PM1aCNT */
 538 static void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val)
 539 {
 540     ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
 541
 542     if (val & ACPI_BITMASK_SLEEP_ENABLE) {
 543         /* change suspend type */
 544         uint16_t sus_typ = (val >> 10) & 7;
 545         switch(sus_typ) {
 546         case 0: /* soft power off */
 547             qemu_system_shutdown_request();
 548             break;
 549         case 1:
 550             qemu_system_suspend_request();
 551             break;
 552         default:
 553             if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */
 554                 monitor_protocol_event(QEVENT_SUSPEND_DISK, NULL);
 555                 qemu_system_shutdown_request();
 556             }
 557             break;
 558         }
 559     }
 560 }
 561
 562 void acpi_pm1_cnt_update(ACPIREGS *ar,
 563                          bool sci_enable, bool sci_disable)
 564 {
 565     /* ACPI specs 3.0, 4.7.2.5 */
 566     if (sci_enable) {
 567         ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 568     } else if (sci_disable) {
 569         ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
 570     }
 571 }
 572
 573 static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width)
 574 {
 575     ACPIREGS *ar = opaque;
 576     return ar->pm1.cnt.cnt;
 577 }
 578
 579 static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
 580                               unsigned width)
 581 {
 582     acpi_pm1_cnt_write(opaque, val);
 583 }
 584
 585 static const MemoryRegionOps acpi_pm_cnt_ops = {
 586     .read = acpi_pm_cnt_read,
 587     .write = acpi_pm_cnt_write,
 588     .valid.min_access_size = 2,
 589     .valid.max_access_size = 2,
 590     .endianness = DEVICE_LITTLE_ENDIAN,
 591 };
 592
 593 void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent, uint8_t s4_val)
 594 {
 595     ar->pm1.cnt.s4_val = s4_val;
 596     ar->wakeup.notify = acpi_notify_wakeup;
 597     qemu_register_wakeup_notifier(&ar->wakeup);
 598     memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
 599                           &acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
 600     memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
 601 }
 602
 603 void acpi_pm1_cnt_reset(ACPIREGS *ar)
 604 {
 605     ar->pm1.cnt.cnt = 0;
 606 }
 607
 608 /* ACPI GPE */
 609 void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
 610 {
 611     ar->gpe.len = len;
 612     ar->gpe.sts = g_malloc0(len / 2);
 613     ar->gpe.en = g_malloc0(len / 2);
 614 }
 615
 616 void acpi_gpe_reset(ACPIREGS *ar)
 617 {
 618     memset(ar->gpe.sts, 0, ar->gpe.len / 2);
 619     memset(ar->gpe.en, 0, ar->gpe.len / 2);
 620 }
 621
 622 static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
 623 {
 624     uint8_t *cur = NULL;
 625
 626     if (addr < ar->gpe.len / 2) {
 627         cur = ar->gpe.sts + addr;
 628     } else if (addr < ar->gpe.len) {
 629         cur = ar->gpe.en + addr - ar->gpe.len / 2;
 630     } else {
 631         abort();
 632     }
 633
 634     return cur;
 635 }
 636
 637 void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
 638 {
 639     uint8_t *cur;
 640
 641     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 642     if (addr < ar->gpe.len / 2) {
 643         /* GPE_STS */
 644         *cur = (*cur) & ~val;
 645     } else if (addr < ar->gpe.len) {
 646         /* GPE_EN */
 647         *cur = val;
 648     } else {
 649         abort();
 650     }
 651 }
 652
 653 uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
 654 {
 655     uint8_t *cur;
 656     uint32_t val;
 657
 658     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 659     val = 0;
 660     if (cur != NULL) {
 661         val = *cur;
 662     }
 663
 664     return val;
 665 }