xref: /openbmc/qemu/hw/acpi/core.c (revision 8d7f2e76)
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 
74 static void acpi_register_config(void)
75 {
76     qemu_add_opts(&qemu_acpi_opts);
77 }
78 
79 opts_init(acpi_register_config);
80 
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  */
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 
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 
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
316 void *acpi_table_hdr(void *h)
317 {
318     struct acpi_table_header *hdr = h;
319     return &hdr->sig;
320 }
321 
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 
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 
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 
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 */
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 
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 
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 
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 
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 
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 
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 
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     .impl.min_access_size = 4,
533     .valid.min_access_size = 1,
534     .valid.max_access_size = 4,
535     .endianness = DEVICE_LITTLE_ENDIAN,
536 };
537 
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 
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 */
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 
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 
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 
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 
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 */
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 
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 
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 
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 
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 
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 
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