xref: /openbmc/qemu/hw/acpi/core.c (revision 2f3913f4b2ad74baeb5a6f1d36efbd9ecdf1057d)
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  #include "trace.h"
36  
37  struct acpi_table_header {
38      uint16_t _length;         /* our length, not actual part of the hdr */
39                                /* allows easier parsing for fw_cfg clients */
40      char sig[4]
41               QEMU_NONSTRING;  /* ACPI signature (4 ASCII characters) */
42      uint32_t length;          /* Length of table, in bytes, including header */
43      uint8_t revision;         /* ACPI Specification minor version # */
44      uint8_t checksum;         /* To make sum of entire table == 0 */
45      char oem_id[6]
46               QEMU_NONSTRING;  /* OEM identification */
47      char oem_table_id[8]
48               QEMU_NONSTRING;  /* OEM table identification */
49      uint32_t oem_revision;    /* OEM revision number */
50      char asl_compiler_id[4]
51               QEMU_NONSTRING;  /* ASL compiler vendor ID */
52      uint32_t asl_compiler_revision; /* ASL compiler revision number */
53  } QEMU_PACKED;
54  
55  #define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
56  #define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */
57  
58  static const char unsigned dfl_hdr[ACPI_TABLE_HDR_SIZE - ACPI_TABLE_PFX_SIZE] =
59      "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */
60      "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
61      "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */
62      ;
63  
64  char unsigned *acpi_tables;
65  size_t acpi_tables_len;
66  
67  static QemuOptsList qemu_acpi_opts = {
68      .name = "acpi",
69      .implied_opt_name = "data",
70      .head = QTAILQ_HEAD_INITIALIZER(qemu_acpi_opts.head),
71      .desc = { { 0 } } /* validated with OptsVisitor */
72  };
73  
acpi_register_config(void)74  static void acpi_register_config(void)
75  {
76      qemu_add_opts(&qemu_acpi_opts);
77  }
78  
79  opts_init(acpi_register_config);
80  
acpi_checksum(const uint8_t * data,int len)81  static int acpi_checksum(const uint8_t *data, int len)
82  {
83      int sum, i;
84      sum = 0;
85      for (i = 0; i < len; i++) {
86          sum += data[i];
87      }
88      return (-sum) & 0xff;
89  }
90  
91  
92  /* Install a copy of the ACPI table specified in @blob.
93   *
94   * If @has_header is set, @blob starts with the System Description Table Header
95   * structure. Otherwise, "dfl_hdr" is prepended. In any case, each header field
96   * is optionally overwritten from @hdrs.
97   *
98   * It is valid to call this function with
99   * (@blob == NULL && bloblen == 0 && !has_header).
100   *
101   * @hdrs->file and @hdrs->data are ignored.
102   *
103   * SIZE_MAX is considered "infinity" in this function.
104   *
105   * The number of tables that can be installed is not limited, but the 16-bit
106   * counter at the beginning of "acpi_tables" wraps around after UINT16_MAX.
107   */
acpi_table_install(const char unsigned * blob,size_t bloblen,bool has_header,const struct AcpiTableOptions * hdrs,Error ** errp)108  static void acpi_table_install(const char unsigned *blob, size_t bloblen,
109                                 bool has_header,
110                                 const struct AcpiTableOptions *hdrs,
111                                 Error **errp)
112  {
113      size_t body_start;
114      const char unsigned *hdr_src;
115      size_t body_size, acpi_payload_size;
116      struct acpi_table_header *ext_hdr;
117      unsigned changed_fields;
118  
119      /* Calculate where the ACPI table body starts within the blob, plus where
120       * to copy the ACPI table header from.
121       */
122      if (has_header) {
123          /*   _length             | ACPI header in blob | blob body
124           *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^
125           *   ACPI_TABLE_PFX_SIZE     sizeof dfl_hdr      body_size
126           *                           == body_start
127           *
128           *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
129           *                           acpi_payload_size == bloblen
130           */
131          body_start = sizeof dfl_hdr;
132  
133          if (bloblen < body_start) {
134              error_setg(errp, "ACPI table claiming to have header is too "
135                         "short, available: %zu, expected: %zu", bloblen,
136                         body_start);
137              return;
138          }
139          hdr_src = blob;
140      } else {
141          /*   _length             | ACPI header in template | blob body
142           *   ^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^^
143           *   ACPI_TABLE_PFX_SIZE       sizeof dfl_hdr        body_size
144           *                                                   == bloblen
145           *
146           *                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
147           *                                  acpi_payload_size
148           */
149          body_start = 0;
150          hdr_src = dfl_hdr;
151      }
152      body_size = bloblen - body_start;
153      acpi_payload_size = sizeof dfl_hdr + body_size;
154  
155      if (acpi_payload_size > UINT16_MAX) {
156          error_setg(errp, "ACPI table too big, requested: %zu, max: %u",
157                     acpi_payload_size, (unsigned)UINT16_MAX);
158          return;
159      }
160  
161      /* We won't fail from here on. Initialize / extend the globals. */
162      if (acpi_tables == NULL) {
163          acpi_tables_len = sizeof(uint16_t);
164          acpi_tables = g_malloc0(acpi_tables_len);
165      }
166  
167      acpi_tables = g_realloc(acpi_tables, acpi_tables_len +
168                                           ACPI_TABLE_PFX_SIZE +
169                                           sizeof dfl_hdr + body_size);
170  
171      ext_hdr = (struct acpi_table_header *)(acpi_tables + acpi_tables_len);
172      acpi_tables_len += ACPI_TABLE_PFX_SIZE;
173  
174      memcpy(acpi_tables + acpi_tables_len, hdr_src, sizeof dfl_hdr);
175      acpi_tables_len += sizeof dfl_hdr;
176  
177      if (blob != NULL) {
178          memcpy(acpi_tables + acpi_tables_len, blob + body_start, body_size);
179          acpi_tables_len += body_size;
180      }
181  
182      /* increase number of tables */
183      stw_le_p(acpi_tables, lduw_le_p(acpi_tables) + 1u);
184  
185      /* Update the header fields. The strings need not be NUL-terminated. */
186      changed_fields = 0;
187      ext_hdr->_length = cpu_to_le16(acpi_payload_size);
188  
189      if (hdrs->sig) {
190          strncpy(ext_hdr->sig, hdrs->sig, sizeof ext_hdr->sig);
191          ++changed_fields;
192      }
193  
194      if (has_header && le32_to_cpu(ext_hdr->length) != acpi_payload_size) {
195          warn_report("ACPI table has wrong length, header says "
196                      "%" PRIu32 ", actual size %zu bytes",
197                      le32_to_cpu(ext_hdr->length), acpi_payload_size);
198      }
199      ext_hdr->length = cpu_to_le32(acpi_payload_size);
200  
201      if (hdrs->has_rev) {
202          ext_hdr->revision = hdrs->rev;
203          ++changed_fields;
204      }
205  
206      ext_hdr->checksum = 0;
207  
208      if (hdrs->oem_id) {
209          strncpy(ext_hdr->oem_id, hdrs->oem_id, sizeof ext_hdr->oem_id);
210          ++changed_fields;
211      }
212      if (hdrs->oem_table_id) {
213          strncpy(ext_hdr->oem_table_id, hdrs->oem_table_id,
214                  sizeof ext_hdr->oem_table_id);
215          ++changed_fields;
216      }
217      if (hdrs->has_oem_rev) {
218          ext_hdr->oem_revision = cpu_to_le32(hdrs->oem_rev);
219          ++changed_fields;
220      }
221      if (hdrs->asl_compiler_id) {
222          strncpy(ext_hdr->asl_compiler_id, hdrs->asl_compiler_id,
223                  sizeof ext_hdr->asl_compiler_id);
224          ++changed_fields;
225      }
226      if (hdrs->has_asl_compiler_rev) {
227          ext_hdr->asl_compiler_revision = cpu_to_le32(hdrs->asl_compiler_rev);
228          ++changed_fields;
229      }
230  
231      if (!has_header && changed_fields == 0) {
232          warn_report("ACPI table: no headers are specified");
233      }
234  
235      /* recalculate checksum */
236      ext_hdr->checksum = acpi_checksum((const char unsigned *)ext_hdr +
237                                        ACPI_TABLE_PFX_SIZE, acpi_payload_size);
238  }
239  
acpi_table_add(const QemuOpts * opts,Error ** errp)240  void acpi_table_add(const QemuOpts *opts, Error **errp)
241  {
242      AcpiTableOptions *hdrs = NULL;
243      char **pathnames = NULL;
244      char **cur;
245      size_t bloblen = 0;
246      char unsigned *blob = NULL;
247  
248      {
249          Visitor *v;
250  
251          v = opts_visitor_new(opts);
252          visit_type_AcpiTableOptions(v, NULL, &hdrs, errp);
253          visit_free(v);
254      }
255  
256      if (!hdrs) {
257          goto out;
258      }
259      if (!hdrs->file == !hdrs->data) {
260          error_setg(errp, "'-acpitable' requires one of 'data' or 'file'");
261          goto out;
262      }
263  
264      pathnames = g_strsplit(hdrs->file ?: hdrs->data, ":", 0);
265      if (pathnames == NULL || pathnames[0] == NULL) {
266          error_setg(errp, "'-acpitable' requires at least one pathname");
267          goto out;
268      }
269  
270      /* now read in the data files, reallocating buffer as needed */
271      for (cur = pathnames; *cur; ++cur) {
272          int fd = open(*cur, O_RDONLY | O_BINARY);
273  
274          if (fd < 0) {
275              error_setg(errp, "can't open file %s: %s", *cur, strerror(errno));
276              goto out;
277          }
278  
279          for (;;) {
280              char unsigned data[8192];
281              ssize_t r;
282  
283              r = read(fd, data, sizeof data);
284              if (r == 0) {
285                  break;
286              } else if (r > 0) {
287                  blob = g_realloc(blob, bloblen + r);
288                  memcpy(blob + bloblen, data, r);
289                  bloblen += r;
290              } else if (errno != EINTR) {
291                  error_setg(errp, "can't read file %s: %s", *cur,
292                             strerror(errno));
293                  close(fd);
294                  goto out;
295              }
296          }
297  
298          close(fd);
299      }
300  
301      acpi_table_install(blob, bloblen, !!hdrs->file, hdrs, errp);
302  
303  out:
304      g_free(blob);
305      g_strfreev(pathnames);
306      qapi_free_AcpiTableOptions(hdrs);
307  }
308  
acpi_table_len(void * current)309  unsigned acpi_table_len(void *current)
310  {
311      struct acpi_table_header *hdr = current - sizeof(hdr->_length);
312      return hdr->_length;
313  }
314  
315  static
acpi_table_hdr(void * h)316  void *acpi_table_hdr(void *h)
317  {
318      struct acpi_table_header *hdr = h;
319      return &hdr->sig;
320  }
321  
acpi_table_first(void)322  uint8_t *acpi_table_first(void)
323  {
324      if (!acpi_tables) {
325          return NULL;
326      }
327      return acpi_table_hdr(acpi_tables + ACPI_TABLE_PFX_SIZE);
328  }
329  
acpi_table_next(uint8_t * current)330  uint8_t *acpi_table_next(uint8_t *current)
331  {
332      uint8_t *next = current + acpi_table_len(current);
333  
334      if (next - acpi_tables >= acpi_tables_len) {
335          return NULL;
336      } else {
337          return acpi_table_hdr(next);
338      }
339  }
340  
acpi_get_slic_oem(AcpiSlicOem * oem)341  int acpi_get_slic_oem(AcpiSlicOem *oem)
342  {
343      uint8_t *u;
344  
345      for (u = acpi_table_first(); u; u = acpi_table_next(u)) {
346          struct acpi_table_header *hdr = (void *)(u - sizeof(hdr->_length));
347  
348          if (memcmp(hdr->sig, "SLIC", 4) == 0) {
349              oem->id = g_strndup(hdr->oem_id, 6);
350              oem->table_id = g_strndup(hdr->oem_table_id, 8);
351              return 0;
352          }
353      }
354      return -1;
355  }
356  
acpi_notify_wakeup(Notifier * notifier,void * data)357  static void acpi_notify_wakeup(Notifier *notifier, void *data)
358  {
359      ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
360      WakeupReason *reason = data;
361  
362      switch (*reason) {
363      case QEMU_WAKEUP_REASON_RTC:
364          ar->pm1.evt.sts |=
365              (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
366          break;
367      case QEMU_WAKEUP_REASON_PMTIMER:
368          ar->pm1.evt.sts |=
369              (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
370          break;
371      case QEMU_WAKEUP_REASON_OTHER:
372          /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
373             Pretend that resume was caused by power button */
374          ar->pm1.evt.sts |=
375              (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
376          break;
377      default:
378          break;
379      }
380  }
381  
382  /* ACPI PM1a EVT */
acpi_pm1_evt_get_sts(ACPIREGS * ar)383  uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
384  {
385      /* Compare ns-clock, not PM timer ticks, because
386         acpi_pm_tmr_update function uses ns for setting the timer. */
387      int64_t d = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
388      if (d >= muldiv64(ar->tmr.overflow_time,
389                        NANOSECONDS_PER_SECOND, PM_TIMER_FREQUENCY)) {
390          ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
391      }
392      return ar->pm1.evt.sts;
393  }
394  
acpi_pm1_evt_write_sts(ACPIREGS * ar,uint16_t val)395  static void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
396  {
397      uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
398      if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
399          /* if TMRSTS is reset, then compute the new overflow time */
400          acpi_pm_tmr_calc_overflow_time(ar);
401      }
402      ar->pm1.evt.sts &= ~val;
403  }
404  
acpi_pm1_evt_write_en(ACPIREGS * ar,uint16_t val)405  static void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
406  {
407      ar->pm1.evt.en = val;
408      qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
409                                val & ACPI_BITMASK_RT_CLOCK_ENABLE);
410      qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
411                                val & ACPI_BITMASK_TIMER_ENABLE);
412  }
413  
acpi_pm1_evt_power_down(ACPIREGS * ar)414  void acpi_pm1_evt_power_down(ACPIREGS *ar)
415  {
416      if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
417          ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
418          ar->tmr.update_sci(ar);
419      }
420  }
421  
acpi_pm1_evt_reset(ACPIREGS * ar)422  void acpi_pm1_evt_reset(ACPIREGS *ar)
423  {
424      ar->pm1.evt.sts = 0;
425      ar->pm1.evt.en = 0;
426      qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
427      qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
428  }
429  
acpi_pm_evt_read(void * opaque,hwaddr addr,unsigned width)430  static uint64_t acpi_pm_evt_read(void *opaque, hwaddr addr, unsigned width)
431  {
432      ACPIREGS *ar = opaque;
433      switch (addr) {
434      case 0:
435          return acpi_pm1_evt_get_sts(ar);
436      case 2:
437          return ar->pm1.evt.en;
438      default:
439          return 0;
440      }
441  }
442  
acpi_pm_evt_write(void * opaque,hwaddr addr,uint64_t val,unsigned width)443  static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
444                                unsigned width)
445  {
446      ACPIREGS *ar = opaque;
447      switch (addr) {
448      case 0:
449          acpi_pm1_evt_write_sts(ar, val);
450          ar->pm1.evt.update_sci(ar);
451          break;
452      case 2:
453          acpi_pm1_evt_write_en(ar, val);
454          ar->pm1.evt.update_sci(ar);
455          break;
456      }
457  }
458  
459  static const MemoryRegionOps acpi_pm_evt_ops = {
460      .read = acpi_pm_evt_read,
461      .write = acpi_pm_evt_write,
462      .impl.min_access_size = 2,
463      .valid.min_access_size = 1,
464      .valid.max_access_size = 2,
465      .endianness = DEVICE_LITTLE_ENDIAN,
466  };
467  
acpi_pm1_evt_init(ACPIREGS * ar,acpi_update_sci_fn update_sci,MemoryRegion * parent)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 */
acpi_pm_tmr_update(ACPIREGS * ar,bool enable)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  
acpi_pm_tmr_get_clock(void)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  
acpi_pm_tmr_calc_overflow_time(ACPIREGS * ar)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  
acpi_pm_tmr_get(ACPIREGS * ar)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  
acpi_pm_tmr_timer(void * opaque)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  
acpi_pm_tmr_read(void * opaque,hwaddr addr,unsigned width)518  static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
519  {
520      return acpi_pm_tmr_get(opaque);
521  }
522  
acpi_pm_tmr_write(void * opaque,hwaddr addr,uint64_t val,unsigned width)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      .impl.min_access_size = 4,
533      .valid.min_access_size = 1,
534      .valid.max_access_size = 4,
535      .endianness = DEVICE_LITTLE_ENDIAN,
536  };
537  
acpi_pm_tmr_init(ACPIREGS * ar,acpi_update_sci_fn update_sci,MemoryRegion * parent)538  void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
539                        MemoryRegion *parent)
540  {
541      ar->tmr.update_sci = update_sci;
542      ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar);
543      memory_region_init_io(&ar->tmr.io, memory_region_owner(parent),
544                            &acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
545      memory_region_add_subregion(parent, 8, &ar->tmr.io);
546  }
547  
acpi_pm_tmr_reset(ACPIREGS * ar)548  void acpi_pm_tmr_reset(ACPIREGS *ar)
549  {
550      ar->tmr.overflow_time = 0;
551      timer_del(ar->tmr.timer);
552  }
553  
554  /* ACPI PM1aCNT */
acpi_pm1_cnt_update(ACPIREGS * ar,bool sci_enable,bool sci_disable)555  void acpi_pm1_cnt_update(ACPIREGS *ar,
556                           bool sci_enable, bool sci_disable)
557  {
558      /* ACPI specs 3.0, 4.7.2.5 */
559      if (ar->pm1.cnt.acpi_only) {
560          return;
561      }
562  
563      if (sci_enable) {
564          ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
565      } else if (sci_disable) {
566          ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
567      }
568  }
569  
acpi_pm_cnt_read(void * opaque,hwaddr addr,unsigned width)570  static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width)
571  {
572      ACPIREGS *ar = opaque;
573      return ar->pm1.cnt.cnt >> addr * 8;
574  }
575  
acpi_pm_cnt_write(void * opaque,hwaddr addr,uint64_t val,unsigned width)576  static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
577                                unsigned width)
578  {
579      ACPIREGS *ar = opaque;
580  
581      if (addr == 1) {
582          val = val << 8 | (ar->pm1.cnt.cnt & 0xff);
583      }
584      ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
585  
586      if (val & ACPI_BITMASK_SLEEP_ENABLE) {
587          /* change suspend type */
588          uint16_t sus_typ = (val >> 10) & 7;
589          switch (sus_typ) {
590          case 0: /* soft power off */
591              qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
592              break;
593          case 1:
594              qemu_system_suspend_request();
595              break;
596          default:
597              if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */
598                  qapi_event_send_suspend_disk();
599                  qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
600              }
601              break;
602          }
603      }
604  }
605  
606  static const MemoryRegionOps acpi_pm_cnt_ops = {
607      .read = acpi_pm_cnt_read,
608      .write = acpi_pm_cnt_write,
609      .impl.min_access_size = 2,
610      .valid.min_access_size = 1,
611      .valid.max_access_size = 2,
612      .endianness = DEVICE_LITTLE_ENDIAN,
613  };
614  
acpi_pm1_cnt_init(ACPIREGS * ar,MemoryRegion * parent,bool disable_s3,bool disable_s4,uint8_t s4_val,bool acpi_only)615  void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent,
616                         bool disable_s3, bool disable_s4, uint8_t s4_val,
617                         bool acpi_only)
618  {
619      FWCfgState *fw_cfg;
620  
621      ar->pm1.cnt.s4_val = s4_val;
622      ar->pm1.cnt.acpi_only = acpi_only;
623      ar->wakeup.notify = acpi_notify_wakeup;
624      qemu_register_wakeup_notifier(&ar->wakeup);
625  
626      /*
627       * Register wake-up support in QMP query-current-machine API
628       */
629      qemu_register_wakeup_support();
630  
631      memory_region_init_io(&ar->pm1.cnt.io, memory_region_owner(parent),
632                            &acpi_pm_cnt_ops, ar, "acpi-cnt", 2);
633      memory_region_add_subregion(parent, 4, &ar->pm1.cnt.io);
634  
635      fw_cfg = fw_cfg_find();
636      if (fw_cfg) {
637          uint8_t suspend[6] = {128, 0, 0, 129, 128, 128};
638          suspend[3] = 1 | ((!disable_s3) << 7);
639          suspend[4] = s4_val | ((!disable_s4) << 7);
640  
641          fw_cfg_add_file(fw_cfg, "etc/system-states", g_memdup(suspend, 6), 6);
642      }
643  }
644  
acpi_pm1_cnt_reset(ACPIREGS * ar)645  void acpi_pm1_cnt_reset(ACPIREGS *ar)
646  {
647      ar->pm1.cnt.cnt = 0;
648      if (ar->pm1.cnt.acpi_only) {
649          ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
650      }
651  }
652  
653  /* ACPI GPE */
acpi_gpe_init(ACPIREGS * ar,uint8_t len)654  void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
655  {
656      ar->gpe.len = len;
657      /* Only first len / 2 bytes are ever used,
658       * but the caller in ich9.c migrates full len bytes.
659       * TODO: fix ich9.c and drop the extra allocation.
660       */
661      ar->gpe.sts = g_malloc0(len);
662      ar->gpe.en = g_malloc0(len);
663  }
664  
acpi_gpe_reset(ACPIREGS * ar)665  void acpi_gpe_reset(ACPIREGS *ar)
666  {
667      memset(ar->gpe.sts, 0, ar->gpe.len / 2);
668      memset(ar->gpe.en, 0, ar->gpe.len / 2);
669  }
670  
acpi_gpe_ioport_get_ptr(ACPIREGS * ar,uint32_t addr)671  static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
672  {
673      uint8_t *cur = NULL;
674  
675      if (addr < ar->gpe.len / 2) {
676          cur = ar->gpe.sts + addr;
677      } else if (addr < ar->gpe.len) {
678          cur = ar->gpe.en + addr - ar->gpe.len / 2;
679      } else {
680          abort();
681      }
682  
683      return cur;
684  }
685  
acpi_gpe_ioport_writeb(ACPIREGS * ar,uint32_t addr,uint32_t val)686  void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
687  {
688      uint8_t *cur;
689  
690      cur = acpi_gpe_ioport_get_ptr(ar, addr);
691      if (addr < ar->gpe.len / 2) {
692          trace_acpi_gpe_sts_ioport_writeb(addr, val);
693          /* GPE_STS */
694          *cur = (*cur) & ~val;
695      } else if (addr < ar->gpe.len) {
696          trace_acpi_gpe_en_ioport_writeb(addr - (ar->gpe.len / 2), val);
697          /* GPE_EN */
698          *cur = val;
699      } else {
700          abort();
701      }
702  }
703  
acpi_gpe_ioport_readb(ACPIREGS * ar,uint32_t addr)704  uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
705  {
706      uint8_t *cur;
707      uint32_t val;
708  
709      cur = acpi_gpe_ioport_get_ptr(ar, addr);
710      val = 0;
711      if (cur != NULL) {
712          val = *cur;
713      }
714  
715      if (addr < ar->gpe.len / 2) {
716          trace_acpi_gpe_sts_ioport_readb(addr, val);
717      } else {
718          trace_acpi_gpe_en_ioport_readb(addr - (ar->gpe.len / 2), val);
719      }
720  
721      return val;
722  }
723  
acpi_send_gpe_event(ACPIREGS * ar,qemu_irq irq,AcpiEventStatusBits status)724  void acpi_send_gpe_event(ACPIREGS *ar, qemu_irq irq,
725                           AcpiEventStatusBits status)
726  {
727      ar->gpe.sts[0] |= status;
728      acpi_update_sci(ar, irq);
729  }
730  
acpi_update_sci(ACPIREGS * regs,qemu_irq irq)731  void acpi_update_sci(ACPIREGS *regs, qemu_irq irq)
732  {
733      int sci_level, pm1a_sts;
734  
735      pm1a_sts = acpi_pm1_evt_get_sts(regs);
736  
737      sci_level = ((pm1a_sts &
738                    regs->pm1.evt.en & ACPI_BITMASK_PM1_COMMON_ENABLED) != 0) ||
739                  ((regs->gpe.sts[0] & regs->gpe.en[0]) != 0);
740  
741      qemu_set_irq(irq, sci_level);
742  
743      /* schedule a timer interruption if needed */
744      acpi_pm_tmr_update(regs,
745                         (regs->pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
746                         !(pm1a_sts & ACPI_BITMASK_TIMER_STATUS));
747  }
748