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