qemu/hw/acpi/core.c
<<
>>
Prefs
   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 2.1 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
  22#include "qemu/osdep.h"
  23#include "hw/irq.h"
  24#include "hw/acpi/acpi.h"
  25#include "hw/nvram/fw_cfg.h"
  26#include "qemu/config-file.h"
  27#include "qapi/error.h"
  28#include "qapi/opts-visitor.h"
  29#include "qapi/qapi-events-run-state.h"
  30#include "qapi/qapi-visit-acpi.h"
  31#include "qemu/error-report.h"
  32#include "qemu/module.h"
  33#include "qemu/option.h"
  34#include "sysemu/runstate.h"
  35
  36struct acpi_table_header {
  37    uint16_t _length;         /* our length, not actual part of the hdr */
  38                              /* allows easier parsing for fw_cfg clients */
  39    char sig[4]
  40             QEMU_NONSTRING;  /* ACPI signature (4 ASCII characters) */
  41    uint32_t length;          /* Length of table, in bytes, including header */
  42    uint8_t revision;         /* ACPI Specification minor version # */
  43    uint8_t checksum;         /* To make sum of entire table == 0 */
  44    char oem_id[6]
  45             QEMU_NONSTRING;  /* OEM identification */
  46    char oem_table_id[8]
  47             QEMU_NONSTRING;  /* OEM table identification */
  48    uint32_t oem_revision;    /* OEM revision number */
  49    char asl_compiler_id[4]
  50             QEMU_NONSTRING;  /* ASL compiler vendor ID */
  51    uint32_t asl_compiler_revision; /* ASL compiler revision number */
  52} QEMU_PACKED;
  53
  54#define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
  55#define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */
  56
  57static const char unsigned dfl_hdr[ACPI_TABLE_HDR_SIZE - ACPI_TABLE_PFX_SIZE] =
  58    "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */
  59    "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
  60    "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */
  61    ;
  62
  63char unsigned *acpi_tables;
  64size_t acpi_tables_len;
  65
  66static QemuOptsList qemu_acpi_opts = {
  67    .name = "acpi",
  68    .implied_opt_name = "data",
  69    .head = QTAILQ_HEAD_INITIALIZER(qemu_acpi_opts.head),
  70    .desc = { { 0 } } /* validated with OptsVisitor */
  71};
  72
  73static void acpi_register_config(void)
  74{
  75    qemu_add_opts(&qemu_acpi_opts);
  76}
  77
  78opts_init(acpi_register_config);
  79
  80static int acpi_checksum(const uint8_t *data, int len)
  81{
  82    int sum, i;
  83    sum = 0;
  84    for (i = 0; i < len; i++) {
  85        sum += data[i];
  86    }
  87    return (-sum) & 0xff;
  88}
  89
  90
  91/* Install a copy of the ACPI table specified in @blob.
  92 *
  93 * If @has_header is set, @blob starts with the System Description Table Header
  94 * structure. Otherwise, "dfl_hdr" is prepended. In any case, each header field
  95 * is optionally overwritten from @hdrs.
  96 *
  97 * It is valid to call this function with
  98 * (@blob == NULL && bloblen == 0 && !has_header).
  99 *
 100 * @hdrs->file and @hdrs->data are ignored.
 101 *
 102 * SIZE_MAX is considered "infinity" in this function.
 103 *
 104 * The number of tables that can be installed is not limited, but the 16-bit
 105 * counter at the beginning of "acpi_tables" wraps around after UINT16_MAX.
 106 */
 107static void acpi_table_install(const char unsigned *blob, size_t bloblen,
 108                               bool has_header,
 109                               const struct AcpiTableOptions *hdrs,
 110                               Error **errp)
 111{
 112    size_t body_start;
 113    const char unsigned *hdr_src;
 114    size_t body_size, acpi_payload_size;
 115    struct acpi_table_header *ext_hdr;
 116    unsigned changed_fields;
 117
 118    /* Calculate where the ACPI table body starts within the blob, plus where
 119     * to copy the ACPI table header from.
 120     */
 121    if (has_header) {
 122        /*   _length             | ACPI header in blob | blob body
 123         *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^
 124         *   ACPI_TABLE_PFX_SIZE     sizeof dfl_hdr      body_size
 125         *                           == body_start
 126         *
 127         *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 128         *                           acpi_payload_size == bloblen
 129         */
 130        body_start = sizeof dfl_hdr;
 131
 132        if (bloblen < body_start) {
 133            error_setg(errp, "ACPI table claiming to have header is too "
 134                       "short, available: %zu, expected: %zu", bloblen,
 135                       body_start);
 136            return;
 137        }
 138        hdr_src = blob;
 139    } else {
 140        /*   _length             | ACPI header in template | blob body
 141         *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^
 142         *   ACPI_TABLE_PFX_SIZE       sizeof dfl_hdr        body_size
 143         *                                                   == bloblen
 144         *
 145         *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 146         *                                  acpi_payload_size
 147         */
 148        body_start = 0;
 149        hdr_src = dfl_hdr;
 150    }
 151    body_size = bloblen - body_start;
 152    acpi_payload_size = sizeof dfl_hdr + body_size;
 153
 154    if (acpi_payload_size > UINT16_MAX) {
 155        error_setg(errp, "ACPI table too big, requested: %zu, max: %u",
 156                   acpi_payload_size, (unsigned)UINT16_MAX);
 157        return;
 158    }
 159
 160    /* We won't fail from here on. Initialize / extend the globals. */
 161    if (acpi_tables == NULL) {
 162        acpi_tables_len = sizeof(uint16_t);
 163        acpi_tables = g_malloc0(acpi_tables_len);
 164    }
 165
 166    acpi_tables = g_realloc(acpi_tables, acpi_tables_len +
 167                                         ACPI_TABLE_PFX_SIZE +
 168                                         sizeof dfl_hdr + body_size);
 169
 170    ext_hdr = (struct acpi_table_header *)(acpi_tables + acpi_tables_len);
 171    acpi_tables_len += ACPI_TABLE_PFX_SIZE;
 172
 173    memcpy(acpi_tables + acpi_tables_len, hdr_src, sizeof dfl_hdr);
 174    acpi_tables_len += sizeof dfl_hdr;
 175
 176    if (blob != NULL) {
 177        memcpy(acpi_tables + acpi_tables_len, blob + body_start, body_size);
 178        acpi_tables_len += body_size;
 179    }
 180
 181    /* increase number of tables */
 182    stw_le_p(acpi_tables, lduw_le_p(acpi_tables) + 1u);
 183
 184    /* Update the header fields. The strings need not be NUL-terminated. */
 185    changed_fields = 0;
 186    ext_hdr->_length = cpu_to_le16(acpi_payload_size);
 187
 188    if (hdrs->sig) {
 189        strncpy(ext_hdr->sig, hdrs->sig, sizeof ext_hdr->sig);
 190        ++changed_fields;
 191    }
 192
 193    if (has_header && le32_to_cpu(ext_hdr->length) != acpi_payload_size) {
 194        warn_report("ACPI table has wrong length, header says "
 195                    "%" PRIu32 ", actual size %zu bytes",
 196                    le32_to_cpu(ext_hdr->length), acpi_payload_size);
 197    }
 198    ext_hdr->length = cpu_to_le32(acpi_payload_size);
 199
 200    if (hdrs->has_rev) {
 201        ext_hdr->revision = hdrs->rev;
 202        ++changed_fields;
 203    }
 204
 205    ext_hdr->checksum = 0;
 206
 207    if (hdrs->oem_id) {
 208        strncpy(ext_hdr->oem_id, hdrs->oem_id, sizeof ext_hdr->oem_id);
 209        ++changed_fields;
 210    }
 211    if (hdrs->oem_table_id) {
 212        strncpy(ext_hdr->oem_table_id, hdrs->oem_table_id,
 213                sizeof ext_hdr->oem_table_id);
 214        ++changed_fields;
 215    }
 216    if (hdrs->has_oem_rev) {
 217        ext_hdr->oem_revision = cpu_to_le32(hdrs->oem_rev);
 218        ++changed_fields;
 219    }
 220    if (hdrs->asl_compiler_id) {
 221        strncpy(ext_hdr->asl_compiler_id, hdrs->asl_compiler_id,
 222                sizeof ext_hdr->asl_compiler_id);
 223        ++changed_fields;
 224    }
 225    if (hdrs->has_asl_compiler_rev) {
 226        ext_hdr->asl_compiler_revision = cpu_to_le32(hdrs->asl_compiler_rev);
 227        ++changed_fields;
 228    }
 229
 230    if (!has_header && changed_fields == 0) {
 231        warn_report("ACPI table: no headers are specified");
 232    }
 233
 234    /* recalculate checksum */
 235    ext_hdr->checksum = acpi_checksum((const char unsigned *)ext_hdr +
 236                                      ACPI_TABLE_PFX_SIZE, acpi_payload_size);
 237}
 238
 239void acpi_table_add(const QemuOpts *opts, Error **errp)
 240{
 241    AcpiTableOptions *hdrs = NULL;
 242    char **pathnames = NULL;
 243    char **cur;
 244    size_t bloblen = 0;
 245    char unsigned *blob = NULL;
 246
 247    {
 248        Visitor *v;
 249
 250        v = opts_visitor_new(opts);
 251        visit_type_AcpiTableOptions(v, NULL, &hdrs, errp);
 252        visit_free(v);
 253    }
 254
 255    if (!hdrs) {
 256        goto out;
 257    }
 258    if (!hdrs->file == !hdrs->data) {
 259        error_setg(errp, "'-acpitable' requires one of 'data' or 'file'");
 260        goto out;
 261    }
 262
 263    pathnames = g_strsplit(hdrs->file ?: hdrs->data, ":", 0);
 264    if (pathnames == NULL || pathnames[0] == NULL) {
 265        error_setg(errp, "'-acpitable' requires at least one pathname");
 266        goto out;
 267    }
 268
 269    /* now read in the data files, reallocating buffer as needed */
 270    for (cur = pathnames; *cur; ++cur) {
 271        int fd = open(*cur, O_RDONLY | O_BINARY);
 272
 273        if (fd < 0) {
 274            error_setg(errp, "can't open file %s: %s", *cur, strerror(errno));
 275            goto out;
 276        }
 277
 278        for (;;) {
 279            char unsigned data[8192];
 280            ssize_t r;
 281
 282            r = read(fd, data, sizeof data);
 283            if (r == 0) {
 284                break;
 285            } else if (r > 0) {
 286                blob = g_realloc(blob, bloblen + r);
 287                memcpy(blob + bloblen, data, r);
 288                bloblen += r;
 289            } else if (errno != EINTR) {
 290                error_setg(errp, "can't read file %s: %s", *cur,
 291                           strerror(errno));
 292                close(fd);
 293                goto out;
 294            }
 295        }
 296
 297        close(fd);
 298    }
 299
 300    acpi_table_install(blob, bloblen, !!hdrs->file, hdrs, errp);
 301
 302out:
 303    g_free(blob);
 304    g_strfreev(pathnames);
 305    qapi_free_AcpiTableOptions(hdrs);
 306}
 307
 308unsigned acpi_table_len(void *current)
 309{
 310    struct acpi_table_header *hdr = current - sizeof(hdr->_length);
 311    return hdr->_length;
 312}
 313
 314static
 315void *acpi_table_hdr(void *h)
 316{
 317    struct acpi_table_header *hdr = h;
 318    return &hdr->sig;
 319}
 320
 321uint8_t *acpi_table_first(void)
 322{
 323    if (!acpi_tables) {
 324        return NULL;
 325    }
 326    return acpi_table_hdr(acpi_tables + ACPI_TABLE_PFX_SIZE);
 327}
 328
 329uint8_t *acpi_table_next(uint8_t *current)
 330{
 331    uint8_t *next = current + acpi_table_len(current);
 332
 333    if (next - acpi_tables >= acpi_tables_len) {
 334        return NULL;
 335    } else {
 336        return acpi_table_hdr(next);
 337    }
 338}
 339
 340int acpi_get_slic_oem(AcpiSlicOem *oem)
 341{
 342    uint8_t *u;
 343
 344    for (u = acpi_table_first(); u; u = acpi_table_next(u)) {
 345        struct acpi_table_header *hdr = (void *)(u - sizeof(hdr->_length));
 346
 347        if (memcmp(hdr->sig, "SLIC", 4) == 0) {
 348            oem->id = g_strndup(hdr->oem_id, 6);
 349            oem->table_id = g_strndup(hdr->oem_table_id, 8);
 350            return 0;
 351        }
 352    }
 353    return -1;
 354}
 355
 356static void acpi_notify_wakeup(Notifier *notifier, void *data)
 357{
 358    ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
 359    WakeupReason *reason = data;
 360
 361    switch (*reason) {
 362    case QEMU_WAKEUP_REASON_RTC:
 363        ar->pm1.evt.sts |=
 364            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
 365        break;
 366    case QEMU_WAKEUP_REASON_PMTIMER:
 367        ar->pm1.evt.sts |=
 368            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
 369        break;
 370    case QEMU_WAKEUP_REASON_OTHER:
 371        /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
 372           Pretend that resume was caused by power button */
 373        ar->pm1.evt.sts |=
 374            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
 375        break;
 376    default:
 377        break;
 378    }
 379}
 380
 381/* ACPI PM1a EVT */
 382uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
 383{
 384    /* Compare ns-clock, not PM timer ticks, because
 385       acpi_pm_tmr_update function uses ns for setting the timer. */
 386    int64_t d = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 387    if (d >= muldiv64(ar->tmr.overflow_time,
 388                      NANOSECONDS_PER_SECOND, PM_TIMER_FREQUENCY)) {
 389        ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
 390    }
 391    return ar->pm1.evt.sts;
 392}
 393
 394static void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
 395{
 396    uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
 397    if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
 398        /* if TMRSTS is reset, then compute the new overflow time */
 399        acpi_pm_tmr_calc_overflow_time(ar);
 400    }
 401    ar->pm1.evt.sts &= ~val;
 402}
 403
 404static void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
 405{
 406    ar->pm1.evt.en = val;
 407    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
 408                              val & ACPI_BITMASK_RT_CLOCK_ENABLE);
 409    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
 410                              val & ACPI_BITMASK_TIMER_ENABLE);
 411}
 412
 413void acpi_pm1_evt_power_down(ACPIREGS *ar)
 414{
 415    if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
 416        ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
 417        ar->tmr.update_sci(ar);
 418    }
 419}
 420
 421void acpi_pm1_evt_reset(ACPIREGS *ar)
 422{
 423    ar->pm1.evt.sts = 0;
 424    ar->pm1.evt.en = 0;
 425    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
 426    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
 427}
 428
 429static uint64_t acpi_pm_evt_read(void *opaque, hwaddr addr, unsigned width)
 430{
 431    ACPIREGS *ar = opaque;
 432    switch (addr) {
 433    case 0:
 434        return acpi_pm1_evt_get_sts(ar);
 435    case 2:
 436        return ar->pm1.evt.en;
 437    default:
 438        return 0;
 439    }
 440}
 441
 442static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
 443                              unsigned width)
 444{
 445    ACPIREGS *ar = opaque;
 446    switch (addr) {
 447    case 0:
 448        acpi_pm1_evt_write_sts(ar, val);
 449        ar->pm1.evt.update_sci(ar);
 450        break;
 451    case 2:
 452        acpi_pm1_evt_write_en(ar, val);
 453        ar->pm1.evt.update_sci(ar);
 454        break;
 455    }
 456}
 457
 458static const MemoryRegionOps acpi_pm_evt_ops = {
 459    .read = acpi_pm_evt_read,
 460    .write = acpi_pm_evt_write,
 461    .impl.min_access_size = 2,
 462    .valid.min_access_size = 1,
 463    .valid.max_access_size = 2,
 464    .endianness = DEVICE_LITTLE_ENDIAN,
 465};
 466
 467void acpi_pm1_evt_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 468                       MemoryRegion *parent)
 469{
 470    ar->pm1.evt.update_sci = update_sci;
 471    memory_region_init_io(&ar->pm1.evt.io, memory_region_owner(parent),
 472                          &acpi_pm_evt_ops, ar, "acpi-evt", 4);
 473    memory_region_add_subregion(parent, 0, &ar->pm1.evt.io);
 474}
 475
 476/* ACPI PM_TMR */
 477void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)
 478{
 479    int64_t expire_time;
 480
 481    /* schedule a timer interruption if needed */
 482    if (enable) {
 483        expire_time = muldiv64(ar->tmr.overflow_time, NANOSECONDS_PER_SECOND,
 484                               PM_TIMER_FREQUENCY);
 485        timer_mod(ar->tmr.timer, expire_time);
 486    } else {
 487        timer_del(ar->tmr.timer);
 488    }
 489}
 490
 491static inline int64_t acpi_pm_tmr_get_clock(void)
 492{
 493    return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), PM_TIMER_FREQUENCY,
 494                    NANOSECONDS_PER_SECOND);
 495}
 496
 497void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
 498{
 499    int64_t d = acpi_pm_tmr_get_clock();
 500    ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 501}
 502
 503static uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 504{
 505    uint32_t d = acpi_pm_tmr_get_clock();
 506    return d & 0xffffff;
 507}
 508
 509static void acpi_pm_tmr_timer(void *opaque)
 510{
 511    ACPIREGS *ar = opaque;
 512
 513    qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER, NULL);
 514    ar->tmr.update_sci(ar);
 515}
 516
 517static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
 518{
 519    return acpi_pm_tmr_get(opaque);
 520}
 521
 522static void acpi_pm_tmr_write(void *opaque, hwaddr addr, uint64_t val,
 523                              unsigned width)
 524{
 525    /* nothing */
 526}
 527
 528static const MemoryRegionOps acpi_pm_tmr_ops = {
 529    .read = acpi_pm_tmr_read,
 530    .write = acpi_pm_tmr_write,
 531    .impl.min_access_size = 4,
 532    .valid.min_access_size = 1,
 533    .valid.max_access_size = 4,
 534    .endianness = DEVICE_LITTLE_ENDIAN,
 535};
 536
 537void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 538                      MemoryRegion *parent)
 539{
 540    ar->tmr.update_sci = update_sci;
 541    ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar);
 542    memory_region_init_io(&ar->tmr.io, memory_region_owner(parent),
 543                          &acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
 544    memory_region_add_subregion(parent, 8, &ar->tmr.io);
 545}
 546
 547void acpi_pm_tmr_reset(ACPIREGS *ar)
 548{
 549    ar->tmr.overflow_time = 0;
 550    timer_del(ar->tmr.timer);
 551}
 552
 553/* ACPI PM1aCNT */
 554void acpi_pm1_cnt_update(ACPIREGS *ar,
 555                         bool sci_enable, bool sci_disable)
 556{
 557    /* ACPI specs 3.0, 4.7.2.5 */
 558    if (ar->pm1.cnt.acpi_only) {
 559        return;
 560    }
 561
 562    if (sci_enable) {
 563        ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 564    } else if (sci_disable) {
 565        ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
 566    }
 567}
 568
 569static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width)
 570{
 571    ACPIREGS *ar = opaque;
 572    return ar->pm1.cnt.cnt >> addr * 8;
 573}
 574
 575static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
 576                              unsigned width)
 577{
 578    ACPIREGS *ar = opaque;
 579
 580    if (addr == 1) {
 581        val = val << 8 | (ar->pm1.cnt.cnt & 0xff);
 582    }
 583    ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
 584
 585    if (val & ACPI_BITMASK_SLEEP_ENABLE) {
 586        /* change suspend type */
 587        uint16_t sus_typ = (val >> 10) & 7;
 588        switch (sus_typ) {
 589        case 0: /* soft power off */
 590            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 591            break;
 592        case 1:
 593            qemu_system_suspend_request();
 594            break;
 595        default:
 596            if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */
 597                qapi_event_send_suspend_disk();
 598                qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 599            }
 600            break;
 601        }
 602    }
 603}
 604
 605static const MemoryRegionOps acpi_pm_cnt_ops = {
 606    .read = acpi_pm_cnt_read,
 607    .write = acpi_pm_cnt_write,
 608    .impl.min_access_size = 2,
 609    .valid.min_access_size = 1,
 610    .valid.max_access_size = 2,
 611    .endianness = DEVICE_LITTLE_ENDIAN,
 612};
 613
 614void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent,
 615                       bool disable_s3, bool disable_s4, uint8_t s4_val,
 616                       bool acpi_only)
 617{
 618    FWCfgState *fw_cfg;
 619
 620    ar->pm1.cnt.s4_val = s4_val;
 621    ar->pm1.cnt.acpi_only = acpi_only;
 622    ar->wakeup.notify = acpi_notify_wakeup;
 623    qemu_register_wakeup_notifier(&ar->wakeup);
 624
 625    /*
 626     * Register wake-up support in QMP query-current-machine API
 627     */
 628    qemu_register_wakeup_support();
 629
 630    memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
 631                          &acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
 632    memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
 633
 634    fw_cfg = fw_cfg_find();
 635    if (fw_cfg) {
 636        uint8_t suspend[6] = {128, 0, 0, 129, 128, 128};
 637        suspend[3] = 1 | ((!disable_s3) << 7);
 638        suspend[4] = s4_val | ((!disable_s4) << 7);
 639
 640        fw_cfg_add_file(fw_cfg, "etc/system-states", g_memdup(suspend, 6), 6);
 641    }
 642}
 643
 644void acpi_pm1_cnt_reset(ACPIREGS *ar)
 645{
 646    ar->pm1.cnt.cnt = 0;
 647    if (ar->pm1.cnt.acpi_only) {
 648        ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 649    }
 650}
 651
 652/* ACPI GPE */
 653void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
 654{
 655    ar->gpe.len = len;
 656    /* Only first len / 2 bytes are ever used,
 657     * but the caller in ich9.c migrates full len bytes.
 658     * TODO: fix ich9.c and drop the extra allocation.
 659     */
 660    ar->gpe.sts = g_malloc0(len);
 661    ar->gpe.en = g_malloc0(len);
 662}
 663
 664void acpi_gpe_reset(ACPIREGS *ar)
 665{
 666    memset(ar->gpe.sts, 0, ar->gpe.len / 2);
 667    memset(ar->gpe.en, 0, ar->gpe.len / 2);
 668}
 669
 670static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
 671{
 672    uint8_t *cur = NULL;
 673
 674    if (addr < ar->gpe.len / 2) {
 675        cur = ar->gpe.sts + addr;
 676    } else if (addr < ar->gpe.len) {
 677        cur = ar->gpe.en + addr - ar->gpe.len / 2;
 678    } else {
 679        abort();
 680    }
 681
 682    return cur;
 683}
 684
 685void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
 686{
 687    uint8_t *cur;
 688
 689    cur = acpi_gpe_ioport_get_ptr(ar, addr);
 690    if (addr < ar->gpe.len / 2) {
 691        /* GPE_STS */
 692        *cur = (*cur) & ~val;
 693    } else if (addr < ar->gpe.len) {
 694        /* GPE_EN */
 695        *cur = val;
 696    } else {
 697        abort();
 698    }
 699}
 700
 701uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
 702{
 703    uint8_t *cur;
 704    uint32_t val;
 705
 706    cur = acpi_gpe_ioport_get_ptr(ar, addr);
 707    val = 0;
 708    if (cur != NULL) {
 709        val = *cur;
 710    }
 711
 712    return val;
 713}
 714
 715void acpi_send_gpe_event(ACPIREGS *ar, qemu_irq irq,
 716                         AcpiEventStatusBits status)
 717{
 718    ar->gpe.sts[0] |= status;
 719    acpi_update_sci(ar, irq);
 720}
 721
 722void acpi_update_sci(ACPIREGS *regs, qemu_irq irq)
 723{
 724    int sci_level, pm1a_sts;
 725
 726    pm1a_sts = acpi_pm1_evt_get_sts(regs);
 727
 728    sci_level = ((pm1a_sts &
 729                  regs->pm1.evt.en & ACPI_BITMASK_PM1_COMMON_ENABLED) != 0) ||
 730                ((regs->gpe.sts[0] & regs->gpe.en[0]) != 0);
 731
 732    qemu_set_irq(irq, sci_level);
 733
 734    /* schedule a timer interruption if needed */
 735    acpi_pm_tmr_update(regs,
 736                       (regs->pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
 737                       !(pm1a_sts & ACPI_BITMASK_TIMER_STATUS));
 738}
 739