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 #include "hw.h"
  19 #include "pc.h"
  20 #include "pci.h"
  21 #include "qemu-timer.h"
  22 #include "sysemu.h"
  23 #include "i2c.h"
  24 #include "smbus.h"
  25 #include "kvm.h"
  26
  27 //#define DEBUG
  28
  29 /* i82731AB (PIIX4) compatible power management function */
  30 #define PM_FREQ 3579545
  31
  32 #define ACPI_DBG_IO_ADDR  0xb044
  33
  34 typedef struct PIIX4PMState {
  35     PCIDevice dev;
  36     uint16_t pmsts;
  37     uint16_t pmen;
  38     uint16_t pmcntrl;
  39     uint8_t apmc;
  40     uint8_t apms;
  41     QEMUTimer *tmr_timer;
  42     int64_t tmr_overflow_time;
  43     i2c_bus *smbus;
  44     uint8_t smb_stat;
  45     uint8_t smb_ctl;
  46     uint8_t smb_cmd;
  47     uint8_t smb_addr;
  48     uint8_t smb_data0;
  49     uint8_t smb_data1;
  50     uint8_t smb_data[32];
  51     uint8_t smb_index;
  52     qemu_irq irq;
  53 } PIIX4PMState;
  54
  55 #define RSM_STS (1 << 15)
  56 #define PWRBTN_STS (1 << 8)
  57 #define RTC_EN (1 << 10)
  58 #define PWRBTN_EN (1 << 8)
  59 #define GBL_EN (1 << 5)
  60 #define TMROF_EN (1 << 0)
  61
  62 #define SCI_EN (1 << 0)
  63
  64 #define SUS_EN (1 << 13)
  65
  66 #define ACPI_ENABLE 0xf1
  67 #define ACPI_DISABLE 0xf0
  68
  69 #define SMBHSTSTS 0x00
  70 #define SMBHSTCNT 0x02
  71 #define SMBHSTCMD 0x03
  72 #define SMBHSTADD 0x04
  73 #define SMBHSTDAT0 0x05
  74 #define SMBHSTDAT1 0x06
  75 #define SMBBLKDAT 0x07
  76
  77 static PIIX4PMState *pm_state;
  78
  79 static uint32_t get_pmtmr(PIIX4PMState *s)
  80 {
  81     uint32_t d;
  82     d = muldiv64(qemu_get_clock(vm_clock), PM_FREQ, ticks_per_sec);
  83     return d & 0xffffff;
  84 }
  85
  86 static int get_pmsts(PIIX4PMState *s)
  87 {
  88     int64_t d;
  89     int pmsts;
  90     pmsts = s->pmsts;
  91     d = muldiv64(qemu_get_clock(vm_clock), PM_FREQ, ticks_per_sec);
  92     if (d >= s->tmr_overflow_time)
  93         s->pmsts |= TMROF_EN;
  94     return s->pmsts;
  95 }
  96
  97 static void pm_update_sci(PIIX4PMState *s)
  98 {
  99     int sci_level, pmsts;
 100     int64_t expire_time;
 101
 102     pmsts = get_pmsts(s);
 103     sci_level = (((pmsts & s->pmen) &
 104                   (RTC_EN | PWRBTN_EN | GBL_EN | TMROF_EN)) != 0);
 105     qemu_set_irq(s->irq, sci_level);
 106     /* schedule a timer interruption if needed */
 107     if ((s->pmen & TMROF_EN) && !(pmsts & TMROF_EN)) {
 108         expire_time = muldiv64(s->tmr_overflow_time, ticks_per_sec, PM_FREQ);
 109         qemu_mod_timer(s->tmr_timer, expire_time);
 110     } else {
 111         qemu_del_timer(s->tmr_timer);
 112     }
 113 }
 114
 115 static void pm_tmr_timer(void *opaque)
 116 {
 117     PIIX4PMState *s = opaque;
 118     pm_update_sci(s);
 119 }
 120
 121 static void pm_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 122 {
 123     PIIX4PMState *s = opaque;
 124     addr &= 0x3f;
 125     switch(addr) {
 126     case 0x00:
 127         {
 128             int64_t d;
 129             int pmsts;
 130             pmsts = get_pmsts(s);
 131             if (pmsts & val & TMROF_EN) {
 132                 /* if TMRSTS is reset, then compute the new overflow time */
 133                 d = muldiv64(qemu_get_clock(vm_clock), PM_FREQ, ticks_per_sec);
 134                 s->tmr_overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 135             }
 136             s->pmsts &= ~val;
 137             pm_update_sci(s);
 138         }
 139         break;
 140     case 0x02:
 141         s->pmen = val;
 142         pm_update_sci(s);
 143         break;
 144     case 0x04:
 145         {
 146             int sus_typ;
 147             s->pmcntrl = val & ~(SUS_EN);
 148             if (val & SUS_EN) {
 149                 /* change suspend type */
 150                 sus_typ = (val >> 10) & 7;
 151                 switch(sus_typ) {
 152                 case 0: /* soft power off */
 153                     qemu_system_shutdown_request();
 154                     break;
 155                 case 1:
 156                     /* RSM_STS should be set on resume. Pretend that resume
 157                        was caused by power button */
 158                     s->pmsts |= (RSM_STS | PWRBTN_STS);
 159                     qemu_system_reset_request();
 160 #if defined(TARGET_I386)
 161                     cmos_set_s3_resume();
 162 #endif
 163                 default:
 164                     break;
 165                 }
 166             }
 167         }
 168         break;
 169     default:
 170         break;
 171     }
 172 #ifdef DEBUG
 173     printf("PM writew port=0x%04x val=0x%04x\n", addr, val);
 174 #endif
 175 }
 176
 177 static uint32_t pm_ioport_readw(void *opaque, uint32_t addr)
 178 {
 179     PIIX4PMState *s = opaque;
 180     uint32_t val;
 181
 182     addr &= 0x3f;
 183     switch(addr) {
 184     case 0x00:
 185         val = get_pmsts(s);
 186         break;
 187     case 0x02:
 188         val = s->pmen;
 189         break;
 190     case 0x04:
 191         val = s->pmcntrl;
 192         break;
 193     default:
 194         val = 0;
 195         break;
 196     }
 197 #ifdef DEBUG
 198     printf("PM readw port=0x%04x val=0x%04x\n", addr, val);
 199 #endif
 200     return val;
 201 }
 202
 203 static void pm_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
 204 {
 205     //    PIIX4PMState *s = opaque;
 206     addr &= 0x3f;
 207 #ifdef DEBUG
 208     printf("PM writel port=0x%04x val=0x%08x\n", addr, val);
 209 #endif
 210 }
 211
 212 static uint32_t pm_ioport_readl(void *opaque, uint32_t addr)
 213 {
 214     PIIX4PMState *s = opaque;
 215     uint32_t val;
 216
 217     addr &= 0x3f;
 218     switch(addr) {
 219     case 0x08:
 220         val = get_pmtmr(s);
 221         break;
 222     default:
 223         val = 0;
 224         break;
 225     }
 226 #ifdef DEBUG
 227     printf("PM readl port=0x%04x val=0x%08x\n", addr, val);
 228 #endif
 229     return val;
 230 }
 231
 232 static void pm_smi_writeb(void *opaque, uint32_t addr, uint32_t val)
 233 {
 234     PIIX4PMState *s = opaque;
 235     addr &= 1;
 236 #ifdef DEBUG
 237     printf("pm_smi_writeb addr=0x%x val=0x%02x\n", addr, val);
 238 #endif
 239     if (addr == 0) {
 240         s->apmc = val;
 241
 242         /* ACPI specs 3.0, 4.7.2.5 */
 243         if (val == ACPI_ENABLE) {
 244             s->pmcntrl |= SCI_EN;
 245         } else if (val == ACPI_DISABLE) {
 246             s->pmcntrl &= ~SCI_EN;
 247         }
 248
 249         if (s->dev.config[0x5b] & (1 << 1)) {
 250             cpu_interrupt(first_cpu, CPU_INTERRUPT_SMI);
 251         }
 252     } else {
 253         s->apms = val;
 254     }
 255 }
 256
 257 static uint32_t pm_smi_readb(void *opaque, uint32_t addr)
 258 {
 259     PIIX4PMState *s = opaque;
 260     uint32_t val;
 261
 262     addr &= 1;
 263     if (addr == 0) {
 264         val = s->apmc;
 265     } else {
 266         val = s->apms;
 267     }
 268 #ifdef DEBUG
 269     printf("pm_smi_readb addr=0x%x val=0x%02x\n", addr, val);
 270 #endif
 271     return val;
 272 }
 273
 274 static void acpi_dbg_writel(void *opaque, uint32_t addr, uint32_t val)
 275 {
 276 #if defined(DEBUG)
 277     printf("ACPI: DBG: 0x%08x\n", val);
 278 #endif
 279 }
 280
 281 static void smb_transaction(PIIX4PMState *s)
 282 {
 283     uint8_t prot = (s->smb_ctl >> 2) & 0x07;
 284     uint8_t read = s->smb_addr & 0x01;
 285     uint8_t cmd = s->smb_cmd;
 286     uint8_t addr = s->smb_addr >> 1;
 287     i2c_bus *bus = s->smbus;
 288
 289 #ifdef DEBUG
 290     printf("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
 291 #endif
 292     switch(prot) {
 293     case 0x0:
 294         smbus_quick_command(bus, addr, read);
 295         break;
 296     case 0x1:
 297         if (read) {
 298             s->smb_data0 = smbus_receive_byte(bus, addr);
 299         } else {
 300             smbus_send_byte(bus, addr, cmd);
 301         }
 302         break;
 303     case 0x2:
 304         if (read) {
 305             s->smb_data0 = smbus_read_byte(bus, addr, cmd);
 306         } else {
 307             smbus_write_byte(bus, addr, cmd, s->smb_data0);
 308         }
 309         break;
 310     case 0x3:
 311         if (read) {
 312             uint16_t val;
 313             val = smbus_read_word(bus, addr, cmd);
 314             s->smb_data0 = val;
 315             s->smb_data1 = val >> 8;
 316         } else {
 317             smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
 318         }
 319         break;
 320     case 0x5:
 321         if (read) {
 322             s->smb_data0 = smbus_read_block(bus, addr, cmd, s->smb_data);
 323         } else {
 324             smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
 325         }
 326         break;
 327     default:
 328         goto error;
 329     }
 330     return;
 331
 332   error:
 333     s->smb_stat |= 0x04;
 334 }
 335
 336 static void smb_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 337 {
 338     PIIX4PMState *s = opaque;
 339     addr &= 0x3f;
 340 #ifdef DEBUG
 341     printf("SMB writeb port=0x%04x val=0x%02x\n", addr, val);
 342 #endif
 343     switch(addr) {
 344     case SMBHSTSTS:
 345         s->smb_stat = 0;
 346         s->smb_index = 0;
 347         break;
 348     case SMBHSTCNT:
 349         s->smb_ctl = val;
 350         if (val & 0x40)
 351             smb_transaction(s);
 352         break;
 353     case SMBHSTCMD:
 354         s->smb_cmd = val;
 355         break;
 356     case SMBHSTADD:
 357         s->smb_addr = val;
 358         break;
 359     case SMBHSTDAT0:
 360         s->smb_data0 = val;
 361         break;
 362     case SMBHSTDAT1:
 363         s->smb_data1 = val;
 364         break;
 365     case SMBBLKDAT:
 366         s->smb_data[s->smb_index++] = val;
 367         if (s->smb_index > 31)
 368             s->smb_index = 0;
 369         break;
 370     default:
 371         break;
 372     }
 373 }
 374
 375 static uint32_t smb_ioport_readb(void *opaque, uint32_t addr)
 376 {
 377     PIIX4PMState *s = opaque;
 378     uint32_t val;
 379
 380     addr &= 0x3f;
 381     switch(addr) {
 382     case SMBHSTSTS:
 383         val = s->smb_stat;
 384         break;
 385     case SMBHSTCNT:
 386         s->smb_index = 0;
 387         val = s->smb_ctl & 0x1f;
 388         break;
 389     case SMBHSTCMD:
 390         val = s->smb_cmd;
 391         break;
 392     case SMBHSTADD:
 393         val = s->smb_addr;
 394         break;
 395     case SMBHSTDAT0:
 396         val = s->smb_data0;
 397         break;
 398     case SMBHSTDAT1:
 399         val = s->smb_data1;
 400         break;
 401     case SMBBLKDAT:
 402         val = s->smb_data[s->smb_index++];
 403         if (s->smb_index > 31)
 404             s->smb_index = 0;
 405         break;
 406     default:
 407         val = 0;
 408         break;
 409     }
 410 #ifdef DEBUG
 411     printf("SMB readb port=0x%04x val=0x%02x\n", addr, val);
 412 #endif
 413     return val;
 414 }
 415
 416 static void pm_io_space_update(PIIX4PMState *s)
 417 {
 418     uint32_t pm_io_base;
 419
 420     if (s->dev.config[0x80] & 1) {
 421         pm_io_base = le32_to_cpu(*(uint32_t *)(s->dev.config + 0x40));
 422         pm_io_base &= 0xffc0;
 423
 424         /* XXX: need to improve memory and ioport allocation */
 425 #if defined(DEBUG)
 426         printf("PM: mapping to 0x%x\n", pm_io_base);
 427 #endif
 428         register_ioport_write(pm_io_base, 64, 2, pm_ioport_writew, s);
 429         register_ioport_read(pm_io_base, 64, 2, pm_ioport_readw, s);
 430         register_ioport_write(pm_io_base, 64, 4, pm_ioport_writel, s);
 431         register_ioport_read(pm_io_base, 64, 4, pm_ioport_readl, s);
 432     }
 433 }
 434
 435 static void pm_write_config(PCIDevice *d,
 436                             uint32_t address, uint32_t val, int len)
 437 {
 438     pci_default_write_config(d, address, val, len);
 439     if (address == 0x80)
 440         pm_io_space_update((PIIX4PMState *)d);
 441 }
 442
 443 static int vmstate_acpi_after_load(void *opaque)
 444 {
 445     PIIX4PMState *s = opaque;
 446
 447     pm_io_space_update(s);
 448     return 0;
 449 }
 450
 451 static const VMStateDescription vmstate_acpi = {
 452     .name = "piix4_pm",
 453     .version_id = 1,
 454     .minimum_version_id = 1,
 455     .minimum_version_id_old = 1,
 456     .run_after_load = vmstate_acpi_after_load,
 457     .fields      = (VMStateField []) {
 458         VMSTATE_PCI_DEVICE(dev, PIIX4PMState),
 459         VMSTATE_UINT16(pmsts, PIIX4PMState),
 460         VMSTATE_UINT16(pmen, PIIX4PMState),
 461         VMSTATE_UINT16(pmcntrl, PIIX4PMState),
 462         VMSTATE_UINT8(apmc, PIIX4PMState),
 463         VMSTATE_UINT8(apms, PIIX4PMState),
 464         VMSTATE_TIMER(tmr_timer, PIIX4PMState),
 465         VMSTATE_INT64(tmr_overflow_time, PIIX4PMState),
 466         VMSTATE_END_OF_LIST()
 467     }
 468 };
 469
 470 static void piix4_reset(void *opaque)
 471 {
 472     PIIX4PMState *s = opaque;
 473     uint8_t *pci_conf = s->dev.config;
 474
 475     pci_conf[0x58] = 0;
 476     pci_conf[0x59] = 0;
 477     pci_conf[0x5a] = 0;
 478     pci_conf[0x5b] = 0;
 479
 480     if (kvm_enabled()) {
 481         /* Mark SMM as already inited (until KVM supports SMM). */
 482         pci_conf[0x5B] = 0x02;
 483     }
 484 }
 485
 486 static void piix4_powerdown(void *opaque, int irq, int power_failing)
 487 {
 488 #if defined(TARGET_I386)
 489     PIIX4PMState *s = opaque;
 490
 491     if (!s) {
 492         qemu_system_shutdown_request();
 493     } else if (s->pmen & PWRBTN_EN) {
 494         s->pmsts |= PWRBTN_EN;
 495         pm_update_sci(s);
 496     }
 497 #endif
 498 }
 499
 500 i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
 501                        qemu_irq sci_irq)
 502 {
 503     PIIX4PMState *s;
 504     uint8_t *pci_conf;
 505
 506     s = (PIIX4PMState *)pci_register_device(bus,
 507                                          "PM", sizeof(PIIX4PMState),
 508                                          devfn, NULL, pm_write_config);
 509     pm_state = s;
 510     pci_conf = s->dev.config;
 511     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
 512     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371AB_3);
 513     pci_conf[0x06] = 0x80;
 514     pci_conf[0x07] = 0x02;
 515     pci_conf[0x08] = 0x03; // revision number
 516     pci_conf[0x09] = 0x00;
 517     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);
 518     pci_conf[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type
 519     pci_conf[0x3d] = 0x01; // interrupt pin 1
 520
 521     pci_conf[0x40] = 0x01; /* PM io base read only bit */
 522
 523     register_ioport_write(0xb2, 2, 1, pm_smi_writeb, s);
 524     register_ioport_read(0xb2, 2, 1, pm_smi_readb, s);
 525
 526     register_ioport_write(ACPI_DBG_IO_ADDR, 4, 4, acpi_dbg_writel, s);
 527
 528     if (kvm_enabled()) {
 529         /* Mark SMM as already inited to prevent SMM from running.  KVM does not
 530          * support SMM mode. */
 531         pci_conf[0x5B] = 0x02;
 532     }
 533
 534     /* XXX: which specification is used ? The i82731AB has different
 535        mappings */
 536     pci_conf[0x5f] = (parallel_hds[0] != NULL ? 0x80 : 0) | 0x10;
 537     pci_conf[0x63] = 0x60;
 538     pci_conf[0x67] = (serial_hds[0] != NULL ? 0x08 : 0) |
 539         (serial_hds[1] != NULL ? 0x90 : 0);
 540
 541     pci_conf[0x90] = smb_io_base | 1;
 542     pci_conf[0x91] = smb_io_base >> 8;
 543     pci_conf[0xd2] = 0x09;
 544     register_ioport_write(smb_io_base, 64, 1, smb_ioport_writeb, s);
 545     register_ioport_read(smb_io_base, 64, 1, smb_ioport_readb, s);
 546
 547     s->tmr_timer = qemu_new_timer(vm_clock, pm_tmr_timer, s);
 548
 549     qemu_system_powerdown = *qemu_allocate_irqs(piix4_powerdown, s, 1);
 550
 551     vmstate_register(0, &vmstate_acpi, s);
 552
 553     s->smbus = i2c_init_bus(NULL, "i2c");
 554     s->irq = sci_irq;
 555     qemu_register_reset(piix4_reset, s);
 556
 557     return s->smbus;
 558 }
 559
 560 #define GPE_BASE 0xafe0
 561 #define PCI_BASE 0xae00
 562 #define PCI_EJ_BASE 0xae08
 563
 564 struct gpe_regs {
 565     uint16_t sts; /* status */
 566     uint16_t en;  /* enabled */
 567 };
 568
 569 struct pci_status {
 570     uint32_t up;
 571     uint32_t down;
 572 };
 573
 574 static struct gpe_regs gpe;
 575 static struct pci_status pci0_status;
 576
 577 static uint32_t gpe_read_val(uint16_t val, uint32_t addr)
 578 {
 579     if (addr & 1)
 580         return (val >> 8) & 0xff;
 581     return val & 0xff;
 582 }
 583
 584 static uint32_t gpe_readb(void *opaque, uint32_t addr)
 585 {
 586     uint32_t val = 0;
 587     struct gpe_regs *g = opaque;
 588     switch (addr) {
 589         case GPE_BASE:
 590         case GPE_BASE + 1:
 591             val = gpe_read_val(g->sts, addr);
 592             break;
 593         case GPE_BASE + 2:
 594         case GPE_BASE + 3:
 595             val = gpe_read_val(g->en, addr);
 596             break;
 597         default:
 598             break;
 599     }
 600
 601 #if defined(DEBUG)
 602     printf("gpe read %x == %x\n", addr, val);
 603 #endif
 604     return val;
 605 }
 606
 607 static void gpe_write_val(uint16_t *cur, int addr, uint32_t val)
 608 {
 609     if (addr & 1)
 610         *cur = (*cur & 0xff) | (val << 8);
 611     else
 612         *cur = (*cur & 0xff00) | (val & 0xff);
 613 }
 614
 615 static void gpe_reset_val(uint16_t *cur, int addr, uint32_t val)
 616 {
 617     uint16_t x1, x0 = val & 0xff;
 618     int shift = (addr & 1) ? 8 : 0;
 619
 620     x1 = (*cur >> shift) & 0xff;
 621
 622     x1 = x1 & ~x0;
 623
 624     *cur = (*cur & (0xff << (8 - shift))) | (x1 << shift);
 625 }
 626
 627 static void gpe_writeb(void *opaque, uint32_t addr, uint32_t val)
 628 {
 629     struct gpe_regs *g = opaque;
 630     switch (addr) {
 631         case GPE_BASE:
 632         case GPE_BASE + 1:
 633             gpe_reset_val(&g->sts, addr, val);
 634             break;
 635         case GPE_BASE + 2:
 636         case GPE_BASE + 3:
 637             gpe_write_val(&g->en, addr, val);
 638             break;
 639         default:
 640             break;
 641    }
 642
 643 #if defined(DEBUG)
 644     printf("gpe write %x <== %d\n", addr, val);
 645 #endif
 646 }
 647
 648 static uint32_t pcihotplug_read(void *opaque, uint32_t addr)
 649 {
 650     uint32_t val = 0;
 651     struct pci_status *g = opaque;
 652     switch (addr) {
 653         case PCI_BASE:
 654             val = g->up;
 655             break;
 656         case PCI_BASE + 4:
 657             val = g->down;
 658             break;
 659         default:
 660             break;
 661     }
 662
 663 #if defined(DEBUG)
 664     printf("pcihotplug read %x == %x\n", addr, val);
 665 #endif
 666     return val;
 667 }
 668
 669 static void pcihotplug_write(void *opaque, uint32_t addr, uint32_t val)
 670 {
 671     struct pci_status *g = opaque;
 672     switch (addr) {
 673         case PCI_BASE:
 674             g->up = val;
 675             break;
 676         case PCI_BASE + 4:
 677             g->down = val;
 678             break;
 679    }
 680
 681 #if defined(DEBUG)
 682     printf("pcihotplug write %x <== %d\n", addr, val);
 683 #endif
 684 }
 685
 686 static uint32_t pciej_read(void *opaque, uint32_t addr)
 687 {
 688 #if defined(DEBUG)
 689     printf("pciej read %x\n", addr);
 690 #endif
 691     return 0;
 692 }
 693
 694 static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
 695 {
 696 #if defined (TARGET_I386)
 697     int slot = ffs(val) - 1;
 698
 699     pci_device_hot_remove_success(0, slot);
 700 #endif
 701
 702 #if defined(DEBUG)
 703     printf("pciej write %x <== %d\n", addr, val);
 704 #endif
 705 }
 706
 707 static void piix4_device_hot_add(int bus, int slot, int state);
 708
 709 void piix4_acpi_system_hot_add_init(void)
 710 {
 711     register_ioport_write(GPE_BASE, 4, 1, gpe_writeb, &gpe);
 712     register_ioport_read(GPE_BASE, 4, 1,  gpe_readb, &gpe);
 713
 714     register_ioport_write(PCI_BASE, 8, 4, pcihotplug_write, &pci0_status);
 715     register_ioport_read(PCI_BASE, 8, 4,  pcihotplug_read, &pci0_status);
 716
 717     register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, NULL);
 718     register_ioport_read(PCI_EJ_BASE, 4, 4,  pciej_read, NULL);
 719
 720     qemu_system_device_hot_add_register(piix4_device_hot_add);
 721 }
 722
 723 static void enable_device(struct pci_status *p, struct gpe_regs *g, int slot)
 724 {
 725     g->sts |= 2;
 726     p->up |= (1 << slot);
 727 }
 728
 729 static void disable_device(struct pci_status *p, struct gpe_regs *g, int slot)
 730 {
 731     g->sts |= 2;
 732     p->down |= (1 << slot);
 733 }
 734
 735 static void piix4_device_hot_add(int bus, int slot, int state)
 736 {
 737     pci0_status.up = 0;
 738     pci0_status.down = 0;
 739     if (state)
 740         enable_device(&pci0_status, &gpe, slot);
 741     else
 742         disable_device(&pci0_status, &gpe, slot);
 743     if (gpe.en & 2) {
 744         qemu_set_irq(pm_state->irq, 1);
 745         qemu_set_irq(pm_state->irq, 0);
 746     }
 747 }
 748
 749 static qemu_system_device_hot_add_t device_hot_add_callback;
 750 void qemu_system_device_hot_add_register(qemu_system_device_hot_add_t callback)
 751 {
 752     device_hot_add_callback = callback;
 753 }
 754
 755 void qemu_system_device_hot_add(int pcibus, int slot, int state)
 756 {
 757     if (device_hot_add_callback)
 758         device_hot_add_callback(pcibus, slot, state);
 759 }
 760
 761 struct acpi_table_header
 762 {
 763     char signature [4];    /* ACPI signature (4 ASCII characters) */
 764     uint32_t length;          /* Length of table, in bytes, including header */
 765     uint8_t revision;         /* ACPI Specification minor version # */
 766     uint8_t checksum;         /* To make sum of entire table == 0 */
 767     char oem_id [6];       /* OEM identification */
 768     char oem_table_id [8]; /* OEM table identification */
 769     uint32_t oem_revision;    /* OEM revision number */
 770     char asl_compiler_id [4]; /* ASL compiler vendor ID */
 771     uint32_t asl_compiler_revision; /* ASL compiler revision number */
 772 } __attribute__((packed));
 773
 774 char *acpi_tables;
 775 size_t acpi_tables_len;
 776
 777 static int acpi_checksum(const uint8_t *data, int len)
 778 {
 779     int sum, i;
 780     sum = 0;
 781     for(i = 0; i < len; i++)
 782         sum += data[i];
 783     return (-sum) & 0xff;
 784 }
 785
 786 int acpi_table_add(const char *t)
 787 {
 788     static const char *dfl_id = "QEMUQEMU";
 789     char buf[1024], *p, *f;
 790     struct acpi_table_header acpi_hdr;
 791     unsigned long val;
 792     size_t off;
 793
 794     memset(&acpi_hdr, 0, sizeof(acpi_hdr));
 795
 796     if (get_param_value(buf, sizeof(buf), "sig", t)) {
 797         strncpy(acpi_hdr.signature, buf, 4);
 798     } else {
 799         strncpy(acpi_hdr.signature, dfl_id, 4);
 800     }
 801     if (get_param_value(buf, sizeof(buf), "rev", t)) {
 802         val = strtoul(buf, &p, 10);
 803         if (val > 255 || *p != '\0')
 804             goto out;
 805     } else {
 806         val = 1;
 807     }
 808     acpi_hdr.revision = (int8_t)val;
 809
 810     if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
 811         strncpy(acpi_hdr.oem_id, buf, 6);
 812     } else {
 813         strncpy(acpi_hdr.oem_id, dfl_id, 6);
 814     }
 815
 816     if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
 817         strncpy(acpi_hdr.oem_table_id, buf, 8);
 818     } else {
 819         strncpy(acpi_hdr.oem_table_id, dfl_id, 8);
 820     }
 821
 822     if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
 823         val = strtol(buf, &p, 10);
 824         if(*p != '\0')
 825             goto out;
 826     } else {
 827         val = 1;
 828     }
 829     acpi_hdr.oem_revision = cpu_to_le32(val);
 830
 831     if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
 832         strncpy(acpi_hdr.asl_compiler_id, buf, 4);
 833     } else {
 834         strncpy(acpi_hdr.asl_compiler_id, dfl_id, 4);
 835     }
 836
 837     if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
 838         val = strtol(buf, &p, 10);
 839         if(*p != '\0')
 840             goto out;
 841     } else {
 842         val = 1;
 843     }
 844     acpi_hdr.asl_compiler_revision = cpu_to_le32(val);
 845
 846     if (!get_param_value(buf, sizeof(buf), "data", t)) {
 847          buf[0] = '\0';
 848     }
 849
 850     acpi_hdr.length = sizeof(acpi_hdr);
 851
 852     f = buf;
 853     while (buf[0]) {
 854         struct stat s;
 855         char *n = strchr(f, ':');
 856         if (n)
 857             *n = '\0';
 858         if(stat(f, &s) < 0) {
 859             fprintf(stderr, "Can't stat file '%s': %s\n", f, strerror(errno));
 860             goto out;
 861         }
 862         acpi_hdr.length += s.st_size;
 863         if (!n)
 864             break;
 865         *n = ':';
 866         f = n + 1;
 867     }
 868
 869     if (!acpi_tables) {
 870         acpi_tables_len = sizeof(uint16_t);
 871         acpi_tables = qemu_mallocz(acpi_tables_len);
 872     }
 873     p = acpi_tables + acpi_tables_len;
 874     acpi_tables_len += sizeof(uint16_t) + acpi_hdr.length;
 875     acpi_tables = qemu_realloc(acpi_tables, acpi_tables_len);
 876
 877     acpi_hdr.length = cpu_to_le32(acpi_hdr.length);
 878     *(uint16_t*)p = acpi_hdr.length;
 879     p += sizeof(uint16_t);
 880     memcpy(p, &acpi_hdr, sizeof(acpi_hdr));
 881     off = sizeof(acpi_hdr);
 882
 883     f = buf;
 884     while (buf[0]) {
 885         struct stat s;
 886         int fd;
 887         char *n = strchr(f, ':');
 888         if (n)
 889             *n = '\0';
 890         fd = open(f, O_RDONLY);
 891
 892         if(fd < 0)
 893             goto out;
 894         if(fstat(fd, &s) < 0) {
 895             close(fd);
 896             goto out;
 897         }
 898
 899         do {
 900             int r;
 901             r = read(fd, p + off, s.st_size);
 902             if (r > 0) {
 903                 off += r;
 904                 s.st_size -= r;
 905             } else if ((r < 0 && errno != EINTR) || r == 0) {
 906                 close(fd);
 907                 goto out;
 908             }
 909         } while(s.st_size);
 910
 911         close(fd);
 912         if (!n)
 913             break;
 914         f = n + 1;
 915     }
 916
 917     ((struct acpi_table_header*)p)->checksum = acpi_checksum((uint8_t*)p, off);
 918     /* increase number of tables */
 919     (*(uint16_t*)acpi_tables) =
 920             cpu_to_le32(le32_to_cpu(*(uint16_t*)acpi_tables) + 1);
 921     return 0;
 922 out:
 923     if (acpi_tables) {
 924         free(acpi_tables);
 925         acpi_tables = NULL;
 926     }
 927     return -1;
 928 }