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 "qemu/osdep.h"
  22 #include "sysemu/sysemu.h"
  23 #include "hw/hw.h"
  24 #include "hw/acpi/acpi.h"
  25 #include "hw/nvram/fw_cfg.h"
  26 #include "qemu/config-file.h"
  27 #include "qapi/opts-visitor.h"
  28 #include "qapi-visit.h"
  29 #include "qapi-event.h"
  30 #include "qemu/error-report.h"
  31
  32 struct acpi_table_header {
  33     uint16_t _length;         /* our length, not actual part of the hdr */
  34                               /* allows easier parsing for fw_cfg clients */
  35     char sig[4];              /* ACPI signature (4 ASCII characters) */
  36     uint32_t length;          /* Length of table, in bytes, including header */
  37     uint8_t revision;         /* ACPI Specification minor version # */
  38     uint8_t checksum;         /* To make sum of entire table == 0 */
  39     char oem_id[6];           /* OEM identification */
  40     char oem_table_id[8];     /* OEM table identification */
  41     uint32_t oem_revision;    /* OEM revision number */
  42     char asl_compiler_id[4];  /* ASL compiler vendor ID */
  43     uint32_t asl_compiler_revision; /* ASL compiler revision number */
  44 } QEMU_PACKED;
  45
  46 #define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
  47 #define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */
  48
  49 static const char unsigned dfl_hdr[ACPI_TABLE_HDR_SIZE - ACPI_TABLE_PFX_SIZE] =
  50     "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */
  51     "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
  52     "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */
  53     ;
  54
  55 char unsigned *acpi_tables;
  56 size_t acpi_tables_len;
  57
  58 static QemuOptsList qemu_acpi_opts = {
  59     .name = "acpi",
  60     .implied_opt_name = "data",
  61     .head = QTAILQ_HEAD_INITIALIZER(qemu_acpi_opts.head),
  62     .desc = { { 0 } } /* validated with OptsVisitor */
  63 };
  64
  65 static void acpi_register_config(void)
  66 {
  67     qemu_add_opts(&qemu_acpi_opts);
  68 }
  69
  70 opts_init(acpi_register_config);
  71
  72 static int acpi_checksum(const uint8_t *data, int len)
  73 {
  74     int sum, i;
  75     sum = 0;
  76     for (i = 0; i < len; i++) {
  77         sum += data[i];
  78     }
  79     return (-sum) & 0xff;
  80 }
  81
  82
  83 /* Install a copy of the ACPI table specified in @blob.
  84  *
  85  * If @has_header is set, @blob starts with the System Description Table Header
  86  * structure. Otherwise, "dfl_hdr" is prepended. In any case, each header field
  87  * is optionally overwritten from @hdrs.
  88  *
  89  * It is valid to call this function with
  90  * (@blob == NULL && bloblen == 0 && !has_header).
  91  *
  92  * @hdrs->file and @hdrs->data are ignored.
  93  *
  94  * SIZE_MAX is considered "infinity" in this function.
  95  *
  96  * The number of tables that can be installed is not limited, but the 16-bit
  97  * counter at the beginning of "acpi_tables" wraps around after UINT16_MAX.
  98  */
  99 static void acpi_table_install(const char unsigned *blob, size_t bloblen,
 100                                bool has_header,
 101                                const struct AcpiTableOptions *hdrs,
 102                                Error **errp)
 103 {
 104     size_t body_start;
 105     const char unsigned *hdr_src;
 106     size_t body_size, acpi_payload_size;
 107     struct acpi_table_header *ext_hdr;
 108     unsigned changed_fields;
 109
 110     /* Calculate where the ACPI table body starts within the blob, plus where
 111      * to copy the ACPI table header from.
 112      */
 113     if (has_header) {
 114         /*   _length             | ACPI header in blob | blob body
 115          *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^
 116          *   ACPI_TABLE_PFX_SIZE     sizeof dfl_hdr      body_size
 117          *                           == body_start
 118          *
 119          *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 120          *                           acpi_payload_size == bloblen
 121          */
 122         body_start = sizeof dfl_hdr;
 123
 124         if (bloblen < body_start) {
 125             error_setg(errp, "ACPI table claiming to have header is too "
 126                        "short, available: %zu, expected: %zu", bloblen,
 127                        body_start);
 128             return;
 129         }
 130         hdr_src = blob;
 131     } else {
 132         /*   _length             | ACPI header in template | blob body
 133          *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^
 134          *   ACPI_TABLE_PFX_SIZE       sizeof dfl_hdr        body_size
 135          *                                                   == bloblen
 136          *
 137          *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 138          *                                  acpi_payload_size
 139          */
 140         body_start = 0;
 141         hdr_src = dfl_hdr;
 142     }
 143     body_size = bloblen - body_start;
 144     acpi_payload_size = sizeof dfl_hdr + body_size;
 145
 146     if (acpi_payload_size > UINT16_MAX) {
 147         error_setg(errp, "ACPI table too big, requested: %zu, max: %u",
 148                    acpi_payload_size, (unsigned)UINT16_MAX);
 149         return;
 150     }
 151
 152     /* We won't fail from here on. Initialize / extend the globals. */
 153     if (acpi_tables == NULL) {
 154         acpi_tables_len = sizeof(uint16_t);
 155         acpi_tables = g_malloc0(acpi_tables_len);
 156     }
 157
 158     acpi_tables = g_realloc(acpi_tables, acpi_tables_len +
 159                                          ACPI_TABLE_PFX_SIZE +
 160                                          sizeof dfl_hdr + body_size);
 161
 162     ext_hdr = (struct acpi_table_header *)(acpi_tables + acpi_tables_len);
 163     acpi_tables_len += ACPI_TABLE_PFX_SIZE;
 164
 165     memcpy(acpi_tables + acpi_tables_len, hdr_src, sizeof dfl_hdr);
 166     acpi_tables_len += sizeof dfl_hdr;
 167
 168     if (blob != NULL) {
 169         memcpy(acpi_tables + acpi_tables_len, blob + body_start, body_size);
 170         acpi_tables_len += body_size;
 171     }
 172
 173     /* increase number of tables */
 174     stw_le_p(acpi_tables, lduw_le_p(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         warn_report("ACPI table has wrong length, header says "
 187                     "%" PRIu32 ", actual size %zu bytes",
 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         warn_report("ACPI table: no headers are specified");
 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         Visitor *v;
 242
 243         v = opts_visitor_new(opts);
 244         visit_type_AcpiTableOptions(v, NULL, &hdrs, &err);
 245         visit_free(v);
 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     qapi_free_AcpiTableOptions(hdrs);
 299
 300     error_propagate(errp, err);
 301 }
 302
 303 static bool acpi_table_builtin = false;
 304
 305 void acpi_table_add_builtin(const QemuOpts *opts, Error **errp)
 306 {
 307     acpi_table_builtin = true;
 308     acpi_table_add(opts, errp);
 309 }
 310
 311 unsigned acpi_table_len(void *current)
 312 {
 313     struct acpi_table_header *hdr = current - sizeof(hdr->_length);
 314     return hdr->_length;
 315 }
 316
 317 static
 318 void *acpi_table_hdr(void *h)
 319 {
 320     struct acpi_table_header *hdr = h;
 321     return &hdr->sig;
 322 }
 323
 324 uint8_t *acpi_table_first(void)
 325 {
 326     if (acpi_table_builtin || !acpi_tables) {
 327         return NULL;
 328     }
 329     return acpi_table_hdr(acpi_tables + ACPI_TABLE_PFX_SIZE);
 330 }
 331
 332 uint8_t *acpi_table_next(uint8_t *current)
 333 {
 334     uint8_t *next = current + acpi_table_len(current);
 335
 336     if (next - acpi_tables >= acpi_tables_len) {
 337         return NULL;
 338     } else {
 339         return acpi_table_hdr(next);
 340     }
 341 }
 342
 343 int acpi_get_slic_oem(AcpiSlicOem *oem)
 344 {
 345     uint8_t *u;
 346
 347     for (u = acpi_table_first(); u; u = acpi_table_next(u)) {
 348         struct acpi_table_header *hdr = (void *)(u - sizeof(hdr->_length));
 349
 350         if (memcmp(hdr->sig, "SLIC", 4) == 0) {
 351             oem->id = hdr->oem_id;
 352             oem->table_id = hdr->oem_table_id;
 353             return 0;
 354         }
 355     }
 356     return -1;
 357 }
 358
 359 static void acpi_notify_wakeup(Notifier *notifier, void *data)
 360 {
 361     ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
 362     WakeupReason *reason = data;
 363
 364     switch (*reason) {
 365     case QEMU_WAKEUP_REASON_RTC:
 366         ar->pm1.evt.sts |=
 367             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
 368         break;
 369     case QEMU_WAKEUP_REASON_PMTIMER:
 370         ar->pm1.evt.sts |=
 371             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
 372         break;
 373     case QEMU_WAKEUP_REASON_OTHER:
 374         /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
 375            Pretend that resume was caused by power button */
 376         ar->pm1.evt.sts |=
 377             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
 378         break;
 379     default:
 380         break;
 381     }
 382 }
 383
 384 /* ACPI PM1a EVT */
 385 uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
 386 {
 387     /* Compare ns-clock, not PM timer ticks, because
 388        acpi_pm_tmr_update function uses ns for setting the timer. */
 389     int64_t d = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 390     if (d >= muldiv64(ar->tmr.overflow_time,
 391                       NANOSECONDS_PER_SECOND, PM_TIMER_FREQUENCY)) {
 392         ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
 393     }
 394     return ar->pm1.evt.sts;
 395 }
 396
 397 static void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
 398 {
 399     uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
 400     if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
 401         /* if TMRSTS is reset, then compute the new overflow time */
 402         acpi_pm_tmr_calc_overflow_time(ar);
 403     }
 404     ar->pm1.evt.sts &= ~val;
 405 }
 406
 407 static void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
 408 {
 409     ar->pm1.evt.en = val;
 410     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
 411                               val & ACPI_BITMASK_RT_CLOCK_ENABLE);
 412     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
 413                               val & ACPI_BITMASK_TIMER_ENABLE);
 414 }
 415
 416 void acpi_pm1_evt_power_down(ACPIREGS *ar)
 417 {
 418     if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
 419         ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
 420         ar->tmr.update_sci(ar);
 421     }
 422 }
 423
 424 void acpi_pm1_evt_reset(ACPIREGS *ar)
 425 {
 426     ar->pm1.evt.sts = 0;
 427     ar->pm1.evt.en = 0;
 428     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
 429     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
 430 }
 431
 432 static uint64_t acpi_pm_evt_read(void *opaque, hwaddr addr, unsigned width)
 433 {
 434     ACPIREGS *ar = opaque;
 435     switch (addr) {
 436     case 0:
 437         return acpi_pm1_evt_get_sts(ar);
 438     case 2:
 439         return ar->pm1.evt.en;
 440     default:
 441         return 0;
 442     }
 443 }
 444
 445 static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
 446                               unsigned width)
 447 {
 448     ACPIREGS *ar = opaque;
 449     switch (addr) {
 450     case 0:
 451         acpi_pm1_evt_write_sts(ar, val);
 452         ar->pm1.evt.update_sci(ar);
 453         break;
 454     case 2:
 455         acpi_pm1_evt_write_en(ar, val);
 456         ar->pm1.evt.update_sci(ar);
 457         break;
 458     }
 459 }
 460
 461 static const MemoryRegionOps acpi_pm_evt_ops = {
 462     .read = acpi_pm_evt_read,
 463     .write = acpi_pm_evt_write,
 464     .valid.min_access_size = 2,
 465     .valid.max_access_size = 2,
 466     .endianness = DEVICE_LITTLE_ENDIAN,
 467 };
 468
 469 void acpi_pm1_evt_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
 470                        MemoryRegion *parent)
 471 {
 472     ar->pm1.evt.update_sci = update_sci;
 473     memory_region_init_io(&ar->pm1.evt.io, memory_region_owner(parent),
 474                           &acpi_pm_evt_ops, ar, "acpi-evt", 4);
 475     memory_region_add_subregion(parent, 0, &ar->pm1.evt.io);
 476 }
 477
 478 /* ACPI PM_TMR */
 479 void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)
 480 {
 481     int64_t expire_time;
 482
 483     /* schedule a timer interruption if needed */
 484     if (enable) {
 485         expire_time = muldiv64(ar->tmr.overflow_time, NANOSECONDS_PER_SECOND,
 486                                PM_TIMER_FREQUENCY);
 487         timer_mod(ar->tmr.timer, expire_time);
 488     } else {
 489         timer_del(ar->tmr.timer);
 490     }
 491 }
 492
 493 static inline int64_t acpi_pm_tmr_get_clock(void)
 494 {
 495     return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), PM_TIMER_FREQUENCY,
 496                     NANOSECONDS_PER_SECOND);
 497 }
 498
 499 void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
 500 {
 501     int64_t d = acpi_pm_tmr_get_clock();
 502     ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 503 }
 504
 505 static uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 506 {
 507     uint32_t d = acpi_pm_tmr_get_clock();
 508     return d & 0xffffff;
 509 }
 510
 511 static void acpi_pm_tmr_timer(void *opaque)
 512 {
 513     ACPIREGS *ar = opaque;
 514     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER);
 515     ar->tmr.update_sci(ar);
 516 }
 517
 518 static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
 519 {
 520     return acpi_pm_tmr_get(opaque);
 521 }
 522
 523 static void acpi_pm_tmr_write(void *opaque, hwaddr addr, uint64_t val,
 524                               unsigned width)
 525 {
 526     /* nothing */
 527 }
 528
 529 static const MemoryRegionOps acpi_pm_tmr_ops = {
 530     .read = acpi_pm_tmr_read,
 531     .write = acpi_pm_tmr_write,
 532     .valid.min_access_size = 4,
 533     .valid.max_access_size = 4,
 534     .endianness = DEVICE_LITTLE_ENDIAN,
 535 };
 536
 537 void 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
 547 void acpi_pm_tmr_reset(ACPIREGS *ar)
 548 {
 549     ar->tmr.overflow_time = 0;
 550     timer_del(ar->tmr.timer);
 551 }
 552
 553 /* ACPI PM1aCNT */
 554 static void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val)
 555 {
 556     ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
 557
 558     if (val & ACPI_BITMASK_SLEEP_ENABLE) {
 559         /* change suspend type */
 560         uint16_t sus_typ = (val >> 10) & 7;
 561         switch(sus_typ) {
 562         case 0: /* soft power off */
 563             qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 564             break;
 565         case 1:
 566             qemu_system_suspend_request();
 567             break;
 568         default:
 569             if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */
 570                 qapi_event_send_suspend_disk(&error_abort);
 571                 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 572             }
 573             break;
 574         }
 575     }
 576 }
 577
 578 void acpi_pm1_cnt_update(ACPIREGS *ar,
 579                          bool sci_enable, bool sci_disable)
 580 {
 581     /* ACPI specs 3.0, 4.7.2.5 */
 582     if (sci_enable) {
 583         ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 584     } else if (sci_disable) {
 585         ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
 586     }
 587 }
 588
 589 static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width)
 590 {
 591     ACPIREGS *ar = opaque;
 592     return ar->pm1.cnt.cnt;
 593 }
 594
 595 static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
 596                               unsigned width)
 597 {
 598     acpi_pm1_cnt_write(opaque, val);
 599 }
 600
 601 static const MemoryRegionOps acpi_pm_cnt_ops = {
 602     .read = acpi_pm_cnt_read,
 603     .write = acpi_pm_cnt_write,
 604     .valid.min_access_size = 2,
 605     .valid.max_access_size = 2,
 606     .endianness = DEVICE_LITTLE_ENDIAN,
 607 };
 608
 609 void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent,
 610                        bool disable_s3, bool disable_s4, uint8_t s4_val)
 611 {
 612     FWCfgState *fw_cfg;
 613
 614     ar->pm1.cnt.s4_val = s4_val;
 615     ar->wakeup.notify = acpi_notify_wakeup;
 616     qemu_register_wakeup_notifier(&ar->wakeup);
 617     memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
 618                           &acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
 619     memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
 620
 621     fw_cfg = fw_cfg_find();
 622     if (fw_cfg) {
 623         uint8_t suspend[6] = {128, 0, 0, 129, 128, 128};
 624         suspend[3] = 1 | ((!disable_s3) << 7);
 625         suspend[4] = s4_val | ((!disable_s4) << 7);
 626
 627         fw_cfg_add_file(fw_cfg, "etc/system-states", g_memdup(suspend, 6), 6);
 628     }
 629 }
 630
 631 void acpi_pm1_cnt_reset(ACPIREGS *ar)
 632 {
 633     ar->pm1.cnt.cnt = 0;
 634 }
 635
 636 /* ACPI GPE */
 637 void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
 638 {
 639     ar->gpe.len = len;
 640     /* Only first len / 2 bytes are ever used,
 641      * but the caller in ich9.c migrates full len bytes.
 642      * TODO: fix ich9.c and drop the extra allocation.
 643      */
 644     ar->gpe.sts = g_malloc0(len);
 645     ar->gpe.en = g_malloc0(len);
 646 }
 647
 648 void acpi_gpe_reset(ACPIREGS *ar)
 649 {
 650     memset(ar->gpe.sts, 0, ar->gpe.len / 2);
 651     memset(ar->gpe.en, 0, ar->gpe.len / 2);
 652 }
 653
 654 static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
 655 {
 656     uint8_t *cur = NULL;
 657
 658     if (addr < ar->gpe.len / 2) {
 659         cur = ar->gpe.sts + addr;
 660     } else if (addr < ar->gpe.len) {
 661         cur = ar->gpe.en + addr - ar->gpe.len / 2;
 662     } else {
 663         abort();
 664     }
 665
 666     return cur;
 667 }
 668
 669 void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
 670 {
 671     uint8_t *cur;
 672
 673     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 674     if (addr < ar->gpe.len / 2) {
 675         /* GPE_STS */
 676         *cur = (*cur) & ~val;
 677     } else if (addr < ar->gpe.len) {
 678         /* GPE_EN */
 679         *cur = val;
 680     } else {
 681         abort();
 682     }
 683 }
 684
 685 uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
 686 {
 687     uint8_t *cur;
 688     uint32_t val;
 689
 690     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 691     val = 0;
 692     if (cur != NULL) {
 693         val = *cur;
 694     }
 695
 696     return val;
 697 }
 698
 699 void acpi_send_gpe_event(ACPIREGS *ar, qemu_irq irq,
 700                          AcpiEventStatusBits status)
 701 {
 702     ar->gpe.sts[0] |= status;
 703     acpi_update_sci(ar, irq);
 704 }
 705
 706 void acpi_update_sci(ACPIREGS *regs, qemu_irq irq)
 707 {
 708     int sci_level, pm1a_sts;
 709
 710     pm1a_sts = acpi_pm1_evt_get_sts(regs);
 711
 712     sci_level = ((pm1a_sts &
 713                   regs->pm1.evt.en & ACPI_BITMASK_PM1_COMMON_ENABLED) != 0) ||
 714                 ((regs->gpe.sts[0] & regs->gpe.en[0]) != 0);
 715
 716     qemu_set_irq(irq, sci_level);
 717
 718     /* schedule a timer interruption if needed */
 719     acpi_pm_tmr_update(regs,
 720                        (regs->pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
 721                        !(pm1a_sts & ACPI_BITMASK_TIMER_STATUS));
 722 }