hw/acpi.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 "sysemu.h"
  22 #include "hw.h"
  23 #include "pc.h"
  24 #include "acpi.h"
  25 #include "monitor.h"
  26
  27 struct acpi_table_header {
  28     uint16_t _length;         /* our length, not actual part of the hdr */
  29                               /* XXX why we have 2 length fields here? */
  30     char sig[4];              /* ACPI signature (4 ASCII characters) */
  31     uint32_t length;          /* Length of table, in bytes, including header */
  32     uint8_t revision;         /* ACPI Specification minor version # */
  33     uint8_t checksum;         /* To make sum of entire table == 0 */
  34     char oem_id[6];           /* OEM identification */
  35     char oem_table_id[8];     /* OEM table identification */
  36     uint32_t oem_revision;    /* OEM revision number */
  37     char asl_compiler_id[4];  /* ASL compiler vendor ID */
  38     uint32_t asl_compiler_revision; /* ASL compiler revision number */
  39 } QEMU_PACKED;
  40
  41 #define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)
  42 #define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */
  43
  44 static const char dfl_hdr[ACPI_TABLE_HDR_SIZE] =
  45     "\0\0"                   /* fake _length (2) */
  46     "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */
  47     "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */
  48     "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */
  49     ;
  50
  51 char *acpi_tables;
  52 size_t acpi_tables_len;
  53
  54 static int acpi_checksum(const uint8_t *data, int len)
  55 {
  56     int sum, i;
  57     sum = 0;
  58     for (i = 0; i < len; i++) {
  59         sum += data[i];
  60     }
  61     return (-sum) & 0xff;
  62 }
  63
  64 /* XXX fixme: this function uses obsolete argument parsing interface */
  65 int acpi_table_add(const char *t)
  66 {
  67     char buf[1024], *p, *f;
  68     unsigned long val;
  69     size_t len, start, allen;
  70     bool has_header;
  71     int changed;
  72     int r;
  73     struct acpi_table_header hdr;
  74
  75     r = 0;
  76     r |= get_param_value(buf, sizeof(buf), "data", t) ? 1 : 0;
  77     r |= get_param_value(buf, sizeof(buf), "file", t) ? 2 : 0;
  78     switch (r) {
  79     case 0:
  80         buf[0] = '\0';
  81         /* fallthrough for default behavior */
  82     case 1:
  83         has_header = false;
  84         break;
  85     case 2:
  86         has_header = true;
  87         break;
  88     default:
  89         fprintf(stderr, "acpitable: both data and file are specified\n");
  90         return -1;
  91     }
  92
  93     if (!acpi_tables) {
  94         allen = sizeof(uint16_t);
  95         acpi_tables = g_malloc0(allen);
  96     } else {
  97         allen = acpi_tables_len;
  98     }
  99
 100     start = allen;
 101     acpi_tables = g_realloc(acpi_tables, start + ACPI_TABLE_HDR_SIZE);
 102     allen += has_header ? ACPI_TABLE_PFX_SIZE : ACPI_TABLE_HDR_SIZE;
 103
 104     /* now read in the data files, reallocating buffer as needed */
 105
 106     for (f = strtok(buf, ":"); f; f = strtok(NULL, ":")) {
 107         int fd = open(f, O_RDONLY);
 108
 109         if (fd < 0) {
 110             fprintf(stderr, "can't open file %s: %s\n", f, strerror(errno));
 111             return -1;
 112         }
 113
 114         for (;;) {
 115             char data[8192];
 116             r = read(fd, data, sizeof(data));
 117             if (r == 0) {
 118                 break;
 119             } else if (r > 0) {
 120                 acpi_tables = g_realloc(acpi_tables, allen + r);
 121                 memcpy(acpi_tables + allen, data, r);
 122                 allen += r;
 123             } else if (errno != EINTR) {
 124                 fprintf(stderr, "can't read file %s: %s\n",
 125                         f, strerror(errno));
 126                 close(fd);
 127                 return -1;
 128             }
 129         }
 130
 131         close(fd);
 132     }
 133
 134     /* now fill in the header fields */
 135
 136     f = acpi_tables + start;   /* start of the table */
 137     changed = 0;
 138
 139     /* copy the header to temp place to align the fields */
 140     memcpy(&hdr, has_header ? f : dfl_hdr, ACPI_TABLE_HDR_SIZE);
 141
 142     /* length of the table minus our prefix */
 143     len = allen - start - ACPI_TABLE_PFX_SIZE;
 144
 145     hdr._length = cpu_to_le16(len);
 146
 147     if (get_param_value(buf, sizeof(buf), "sig", t)) {
 148         /* strncpy is justified: the field need not be NUL-terminated. */
 149         strncpy(hdr.sig, buf, sizeof(hdr.sig));
 150         ++changed;
 151     }
 152
 153     /* length of the table including header, in bytes */
 154     if (has_header) {
 155         /* check if actual length is correct */
 156         val = le32_to_cpu(hdr.length);
 157         if (val != len) {
 158             fprintf(stderr,
 159                 "warning: acpitable has wrong length,"
 160                 " header says %lu, actual size %zu bytes\n",
 161                 val, len);
 162             ++changed;
 163         }
 164     }
 165     /* we may avoid putting length here if has_header is true */
 166     hdr.length = cpu_to_le32(len);
 167
 168     if (get_param_value(buf, sizeof(buf), "rev", t)) {
 169         val = strtoul(buf, &p, 0);
 170         if (val > 255 || *p) {
 171             fprintf(stderr, "acpitable: \"rev=%s\" is invalid\n", buf);
 172             return -1;
 173         }
 174         hdr.revision = (uint8_t)val;
 175         ++changed;
 176     }
 177
 178     if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
 179         /* strncpy is justified: the field need not be NUL-terminated. */
 180         strncpy(hdr.oem_id, buf, sizeof(hdr.oem_id));
 181         ++changed;
 182     }
 183
 184     if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
 185         /* strncpy is justified: the field need not be NUL-terminated. */
 186         strncpy(hdr.oem_table_id, buf, sizeof(hdr.oem_table_id));
 187         ++changed;
 188     }
 189
 190     if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
 191         val = strtol(buf, &p, 0);
 192         if (*p) {
 193             fprintf(stderr, "acpitable: \"oem_rev=%s\" is invalid\n", buf);
 194             return -1;
 195         }
 196         hdr.oem_revision = cpu_to_le32(val);
 197         ++changed;
 198     }
 199
 200     if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
 201         /* strncpy is justified: the field need not be NUL-terminated. */
 202         strncpy(hdr.asl_compiler_id, buf, sizeof(hdr.asl_compiler_id));
 203         ++changed;
 204     }
 205
 206     if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
 207         val = strtol(buf, &p, 0);
 208         if (*p) {
 209             fprintf(stderr, "acpitable: \"%s=%s\" is invalid\n",
 210                     "asl_compiler_rev", buf);
 211             return -1;
 212         }
 213         hdr.asl_compiler_revision = cpu_to_le32(val);
 214         ++changed;
 215     }
 216
 217     if (!has_header && !changed) {
 218         fprintf(stderr, "warning: acpitable: no table headers are specified\n");
 219     }
 220
 221
 222     /* now calculate checksum of the table, complete with the header */
 223     /* we may as well leave checksum intact if has_header is true */
 224     /* alternatively there may be a way to set cksum to a given value */
 225     hdr.checksum = 0;    /* for checksum calculation */
 226
 227     /* put header back */
 228     memcpy(f, &hdr, sizeof(hdr));
 229
 230     if (changed || !has_header || 1) {
 231         ((struct acpi_table_header *)f)->checksum =
 232             acpi_checksum((uint8_t *)f + ACPI_TABLE_PFX_SIZE, len);
 233     }
 234
 235     /* increase number of tables */
 236     (*(uint16_t *)acpi_tables) =
 237         cpu_to_le32(le32_to_cpu(*(uint16_t *)acpi_tables) + 1);
 238
 239     acpi_tables_len = allen;
 240     return 0;
 241
 242 }
 243
 244 static void acpi_notify_wakeup(Notifier *notifier, void *data)
 245 {
 246     ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);
 247     WakeupReason *reason = data;
 248
 249     switch (*reason) {
 250     case QEMU_WAKEUP_REASON_RTC:
 251         ar->pm1.evt.sts |=
 252             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);
 253         break;
 254     case QEMU_WAKEUP_REASON_PMTIMER:
 255         ar->pm1.evt.sts |=
 256             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);
 257         break;
 258     case QEMU_WAKEUP_REASON_OTHER:
 259     default:
 260         /* ACPI_BITMASK_WAKE_STATUS should be set on resume.
 261            Pretend that resume was caused by power button */
 262         ar->pm1.evt.sts |=
 263             (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);
 264         break;
 265     }
 266 }
 267
 268 /* ACPI PM1a EVT */
 269 uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)
 270 {
 271     int64_t d = acpi_pm_tmr_get_clock();
 272     if (d >= ar->tmr.overflow_time) {
 273         ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;
 274     }
 275     return ar->pm1.evt.sts;
 276 }
 277
 278 void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)
 279 {
 280     uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);
 281     if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {
 282         /* if TMRSTS is reset, then compute the new overflow time */
 283         acpi_pm_tmr_calc_overflow_time(ar);
 284     }
 285     ar->pm1.evt.sts &= ~val;
 286 }
 287
 288 void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)
 289 {
 290     ar->pm1.evt.en = val;
 291     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,
 292                               val & ACPI_BITMASK_RT_CLOCK_ENABLE);
 293     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,
 294                               val & ACPI_BITMASK_TIMER_ENABLE);
 295 }
 296
 297 void acpi_pm1_evt_power_down(ACPIREGS *ar)
 298 {
 299     if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {
 300         ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;
 301         ar->tmr.update_sci(ar);
 302     }
 303 }
 304
 305 void acpi_pm1_evt_reset(ACPIREGS *ar)
 306 {
 307     ar->pm1.evt.sts = 0;
 308     ar->pm1.evt.en = 0;
 309     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);
 310     qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);
 311 }
 312
 313 /* ACPI PM_TMR */
 314 void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)
 315 {
 316     int64_t expire_time;
 317
 318     /* schedule a timer interruption if needed */
 319     if (enable) {
 320         expire_time = muldiv64(ar->tmr.overflow_time, get_ticks_per_sec(),
 321                                PM_TIMER_FREQUENCY);
 322         qemu_mod_timer(ar->tmr.timer, expire_time);
 323     } else {
 324         qemu_del_timer(ar->tmr.timer);
 325     }
 326 }
 327
 328 void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
 329 {
 330     int64_t d = acpi_pm_tmr_get_clock();
 331     ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 332 }
 333
 334 uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 335 {
 336     uint32_t d = acpi_pm_tmr_get_clock();
 337     return d & 0xffffff;
 338 }
 339
 340 static void acpi_pm_tmr_timer(void *opaque)
 341 {
 342     ACPIREGS *ar = opaque;
 343     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER);
 344     ar->tmr.update_sci(ar);
 345 }
 346
 347 void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci)
 348 {
 349     ar->tmr.update_sci = update_sci;
 350     ar->tmr.timer = qemu_new_timer_ns(vm_clock, acpi_pm_tmr_timer, ar);
 351 }
 352
 353 void acpi_pm_tmr_reset(ACPIREGS *ar)
 354 {
 355     ar->tmr.overflow_time = 0;
 356     qemu_del_timer(ar->tmr.timer);
 357 }
 358
 359 /* ACPI PM1aCNT */
 360 void acpi_pm1_cnt_init(ACPIREGS *ar)
 361 {
 362     ar->wakeup.notify = acpi_notify_wakeup;
 363     qemu_register_wakeup_notifier(&ar->wakeup);
 364 }
 365
 366 void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val, char s4)
 367 {
 368     ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);
 369
 370     if (val & ACPI_BITMASK_SLEEP_ENABLE) {
 371         /* change suspend type */
 372         uint16_t sus_typ = (val >> 10) & 7;
 373         switch(sus_typ) {
 374         case 0: /* soft power off */
 375             qemu_system_shutdown_request();
 376             break;
 377         case 1:
 378             qemu_system_suspend_request();
 379             break;
 380         default:
 381             if (sus_typ == s4) { /* S4 request */
 382                 monitor_protocol_event(QEVENT_SUSPEND_DISK, NULL);
 383                 qemu_system_shutdown_request();
 384             }
 385             break;
 386         }
 387     }
 388 }
 389
 390 void acpi_pm1_cnt_update(ACPIREGS *ar,
 391                          bool sci_enable, bool sci_disable)
 392 {
 393     /* ACPI specs 3.0, 4.7.2.5 */
 394     if (sci_enable) {
 395         ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;
 396     } else if (sci_disable) {
 397         ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;
 398     }
 399 }
 400
 401 void acpi_pm1_cnt_reset(ACPIREGS *ar)
 402 {
 403     ar->pm1.cnt.cnt = 0;
 404 }
 405
 406 /* ACPI GPE */
 407 void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
 408 {
 409     ar->gpe.len = len;
 410     ar->gpe.sts = g_malloc0(len / 2);
 411     ar->gpe.en = g_malloc0(len / 2);
 412 }
 413
 414 void acpi_gpe_blk(ACPIREGS *ar, uint32_t blk)
 415 {
 416     ar->gpe.blk = blk;
 417 }
 418
 419 void acpi_gpe_reset(ACPIREGS *ar)
 420 {
 421     memset(ar->gpe.sts, 0, ar->gpe.len / 2);
 422     memset(ar->gpe.en, 0, ar->gpe.len / 2);
 423 }
 424
 425 static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)
 426 {
 427     uint8_t *cur = NULL;
 428
 429     if (addr < ar->gpe.len / 2) {
 430         cur = ar->gpe.sts + addr;
 431     } else if (addr < ar->gpe.len) {
 432         cur = ar->gpe.en + addr - ar->gpe.len / 2;
 433     } else {
 434         abort();
 435     }
 436
 437     return cur;
 438 }
 439
 440 void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)
 441 {
 442     uint8_t *cur;
 443
 444     addr -= ar->gpe.blk;
 445     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 446     if (addr < ar->gpe.len / 2) {
 447         /* GPE_STS */
 448         *cur = (*cur) & ~val;
 449     } else if (addr < ar->gpe.len) {
 450         /* GPE_EN */
 451         *cur = val;
 452     } else {
 453         abort();
 454     }
 455 }
 456
 457 uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)
 458 {
 459     uint8_t *cur;
 460     uint32_t val;
 461
 462     addr -= ar->gpe.blk;
 463     cur = acpi_gpe_ioport_get_ptr(ar, addr);
 464     val = 0;
 465     if (cur != NULL) {
 466         val = *cur;
 467     }
 468
 469     return val;
 470 }